Increased colonic bile acid exposure: a relevant factor for symptoms and treatment in IBS
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1 Neurogastroenterology Downloaded from on May 8, Published by group.bmj.com ORIGINAL ARTICLE Increased colonic bile acid exposure: a relevant factor for symptoms and treatment in IBS Antal Bajor, 1 Hans Törnblom, 1,2 Mats Rudling, 3,4 Kjell-Arne Ung, 5 Magnus Simrén 1,2 1 Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden 2 University of Gothenburg Centre for Person-Centred Care (GPCC), Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden 3 Department of Medicine, Metabolism Unit, Center for Endocrinology, Metabolism, and Diabetes, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden 4 Molecular Nutrition Unit, Department of Biosciences and Nutrition, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden 5 Department of Internal Medicine, Medicine and R&D Unit, Skaraborgs Hospital, Skövde, Sweden Correspondence to Professor Magnus Simrén, Department of Internal Medicine & Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; magnus.simren@medicine. gu.se Received 26 August 2013 Revised 18 March 2014 Accepted 21 March 2014 Published Online First 12 April 2014 To cite: Bajor A, Törnblom H, Rudling M, et al. Gut 2015;64: ABSTRACT Objective Bile acids may play a role in the pathogenesis of IBS. We investigated the potential effects of bile acids entering the colon and its role in the symptom pattern in IBS. Design We measured 75 Se-labelled homocholic acidtaurine ( 75 SeHCAT) retention, and serum levels of 7α-hydroxy-4-cholesten-3-one (C4) and fibroblast growth factor (FGF) 19 in patients with IBS (n=141) and control subjects ( 75 SeHCAT n=29; C4 and FGF19 n=435). In patients with IBS stool frequency and form, as well as GI symptom severity were registered, and in a proportion of patients colonic transit time and rectal sensitivity were measured (n=66). An 8-week open-label treatment with colestipol was offered to patients with 75 SeHCAT <20%, and the effect of treatment was evaluated with IBS severity scoring system and adequate relief of IBS symptoms. Results Compared with controls, patients with IBS had lower 75 SeHCAT values (p=0.005), higher C4c levels (C4 corrected for cholesterol) ( p<0.001), but similar FGF19 levels. Abnormal 75 SeHCAT retention (<10%) was seen in 18% of patients, whereas 23% had elevated C4c levels. Patients with IBS with 75 SeHCAT retention <10% had more frequent stools, accelerated colonic transit time, rectal hyposensitivity, a higher body mass index, higher C4c and lower FGF19 levels. Colestipol treatment improved IBS symptoms (IBS severity scoring system 220 ±109 vs 277±106; p<0.01), and 15/27 patients fulfilled criteria for treatment response (adequate relief 50% of weeks 5 8). Conclusions Increased colonic bile acid exposure influences bowel habit and colonic transit time in patients with IBS. A high response rate to open label treatment with colestipol supports this, but placebocontrolled studies are warranted. INTRODUCTION IBS is one of the most common functional GI disorders, affecting up to 20% of the Western population. 12 The pathophysiology of IBS is incompletely understood, but disturbed motor, sensory 3 4 and secretory 5 function of the GI tract, as well as psychosocial factors are important. 6 Altered immune function and intestinal dysbiosis are considered as putative pathogenetic factors for the development of IBS symptoms in at least a subgroup of patients. 7 Luminal factors could also play a role 8 exemplified by bile acids affecting GI motility 9 and secretion, as well as immune function and microbiota composition. 13 Moreover, an effect of bile acids on visceral sensitivity has been suggested and the colonic motor and secretory response to bile Significance of this study What is already known on this subject? Excessive amounts of bile acids reaching the colon leads to watery stools and an erratic bowel pattern, and bile acid malabsorption, diagnosed by use of the 75 Se-labelled homocholic acid-taurine ( 75 SeHCAT) test, is a frequent finding in patients with chronic diarrhoea. Alternative tests useful in the diagnosis of bile acid malabsorption are serum concentration of 7α-hydroxy-4-cholesten-3-one (C4), which reflects the rate of the hepatic bile acid synthesis, and fibroblast growth factor (FGF) 19, which suppresses bile acid synthesis. Recent small studies have implicated a potential role of bile acid malabsorption in a subset of patients with IBS. What are the new findings? Abnormal 75 SeHCAT retention and/or high C4 levels, indicating increased bile acid exposure to the colon is present in a substantial proportion of patients with predominantly non-constipated IBS. The 75 SeHCAT test, as a measure of the bile acid turnover rate, correlates with hepatic bile acid synthesis and relates to bowel habit and colonic transit time in patients with IBS, as well as with body mass index and markers of general metabolism such as plasma lipid profiles. The positive symptomatic response to open label treatment with a bile acid binding agent (colestipol) in patients with IBS with low 75 SeHCAT values supports a role of bile acids in IBS symptomatology. How might it impact on clinical practice in the foreseeable future? Our study highlights a role for bile acids in symptom generation in a subset of patients with IBS, which has important future treatment implications in this large patient group. acids seems to be exaggerated in patients with IBS Further, treatment options modulating the colonic bile acid exposure has successfully been tested in different IBS subgroups Therefore, as bile acids have the potential to affect main 84 Bajor A, et al. Gut 2015;64: doi: /gutjnl
2 Downloaded from on May 8, Published by group.bmj.com Neurogastroenterology pathophysiological factors in IBS, their significance deserves further studies, and recent small studies support the involvement of bile acids in the pathophysiology of IBS. Excessive amounts of bile acids reaching the colon leads to watery stools and an erratic bowel pattern, through their effect on motility and secretion. One well-known example of this is when the enterohepatic circulation is interrupted as a consequence of ileal resection leading to chronic watery diarrhoea, 20 which in turn can be treated effectively with bile acid binding resins There are also idiopathic forms of bile acid malabsorption (BAM), which are prevalent in patients with chronic diarrhoea A systematic review found that 20 30% of patients with symptoms compatible with diarrhoea predominant IBS (IBS-D) or functional diarrhoea may have BAM, but existing studies are limited by poor clinical characterisation of patients. 26 Most often BAM is diagnosed by use of the 75 Se-labelled homocholic acid-taurine ( 75 SeHCAT) test, measuring the retention of radiolabelled ( 75 Se) synthetic homocholic acid conjugated with taurine 7 days after ingestion. 27 This test has been thoroughly validated and the results correlate well with faecal bile acid loss However, the major disadvantage with this test is that it is not available in the USA and several other countries. 29 An alternative way of diagnosing BAM is to measure the serum concentration of 7α-hydroxy-4-cholesten-3-one (C4), which reflects the rate of the hepatic bile acid synthesis. Plasma C4 correlates inversely with 75 SeHCAT values in healthy controls and in patients with diarrhoea without morphological evidence of ileal disease Another possible test in the diagnosis of BAM is fibroblast growth factor (FGF) 19, 35 which is produced in the terminal ileum and proposed to suppress bile acid synthesis by reducing the activity of the ratelimiting enzyme cholesterol-7α-hydroxylase in the liver. 36 Until now, large scale studies with different measures of colonic bile acid exposure in patients with well-characterised IBS have not been performed. The primary aim of our current study was to assess if increased amounts of bile acids entering the colon have a role in the pathogenesis and pathophysiology of IBS and also to evaluate its role in the complex symptom pattern of these patients. In order to achieve this, we have investigated a large number of phenotypically well-characterised patients with IBS with 75 SeHCAT retention and plasma concentration of C4 and FGF19, and compared the results with healthy controls. As a proof of concept we also evaluated the effect of the bile acid binding resin colestipol on IBS symptoms in patients with low 75 SeHCAT retention values. METHODS Subjects Patients with IBS, fulfilling the Rome II criteria 37 referred to our outpatient clinic for evaluation during 2005 and 2006 were included. The patients were further characterised by predominant bowel habit into subtypes; IBS-D, constipation predominant IBS (IBS-C) and alternating type IBS (IBS-A). 37 Organic disorders were excluded with appropriate testing based on the presenting symptoms. Exclusion criteria were: another GI condition explaining their symptoms, previous abdominal surgery including cholecystectomy, but excluding appendectomy, other severe non-gi disease, and current treatment with antidiarrhoeals, bile acid binders or statins. Values of C4 and FGF19 from patients were compared with a group of healthy volunteers studied at the Karolinska Institute, 38 and the results from 75 SeHCAT test with healthy controls investigated at the Sahlgrenska University Hospital. 39 All patients gave verbal and written informed consent and the study was approved by the Regional Ethical Review Boards in Gothenburg and Stockholm, and the radiation safety committee at the University of Gothenburg. Study design Upon inclusion, patients accepting to participate in the study completed a validated questionnaire assessing the perceived severity of their IBS symptoms, the Gastrointestinal Symptom Rating Scale IBS (GSRS-IBS), 40 and had their body mass index (BMI) measured (kg/m 2 ). Blood samples for analyses of C4, plasma cholesterol, triglycerides and FGF19 were taken after an overnight fast (8:00) at the first 75 SeHCAT day, and immediately frozen to 80 C. During the week of the 75 SeHCAT test, the patients recorded all bowel movements on a diary card and graded the stool form based on the Bristol Stool Form scale. 41 Besides performing a 75 SeHCAT test, a proportion of the patients also underwent colonic transit time measurement 3 and assessment of rectal sensitivity with a rectal barostat. 4 All patients with 75 SeHCAT retention values <20% day 7 were offered an open label treatment with a gradually increasing dose of the bile acid binder colestipol (Lestid) during an 8-week period. They received 1 g tablets with the instruction to start with 1 g twice daily, with an increase of the dose by 1 g/day every other day if they had not noticed a positive effect on their IBS symptoms, and had no side effects. They recorded their daily bowel habits in a diary card described above, and every other week they completed the IBS Severity Scoring System (IBS-SSS) 42 questionnaire. The dose of colestipol was registered once a week during the treatment period, and the subjects were asked on a weekly basis if they had had adequate relief of their IBS symptoms. Questionnaires The Gastrointestinal Symptom Rating Scale-IBS (GSRS-IBS) This is an IBS specific questionnaire, assessing the severity of IBS-related GI symptoms during the past week using a sevengraded Likert scale, ranging from 1 (no discomfort) to 7 (very severe discomfort). 40 This questionnaire consists of 13 questions, which can be grouped into 5 domains: pain, bloating, diarrhoea, constipation and satiety. We used this questionnaire in the first part of the study, where the association between BAM and GI symptom severity was assessed. The IBS Severity Scoring System (IBS-SSS) This questionnaire was used to evaluate the severity of IBS symptoms during the colestipol treatment phase. 42 It includes five items pain severity, pain frequency, severity of abdominal distension, bowel habit dissatisfaction and daily life interference that are combined into an overall IBS score ranging from 0 (no symptoms) to 500 (maximum severity). Use of IBS-SSS is recommended by the Rome Foundation as a valid outcome measure in clinical trials in IBS, 43 and was therefore used in the treatment part. The subjects were also asked on a weekly basis if they had experienced adequate relief of their IBS symptoms ( yes or no ) during the preceding week. A responder to colestipol treatment was defined as a patient who reported adequate relief of the IBS symptoms at least 2 of the last 4 weeks of the treatment period, that is, weeks 5 8. Analyses of blood samples One ml of blood serum was assayed for C4 by high performance liquid chromatography as previously described. 44 As plasma C4 binds to plasma cholesterol containing lipoproteins C4 values Bajor A, et al. Gut 2015;64: doi: /gutjnl
3 Neurogastroenterology Downloaded from on May 8, Published by group.bmj.com were corrected for plasma total cholesterol (C4c) as previously outlined. 45 The normal values for C4c were mg/mol for men and mg/mol for women based on centile 5 95% in the healthy control subjects included in this study (n=435). FGF19 was analysed as previously described. 46 Normal values for FG19 (centile 5 95% in control subjects) were pg/ml for men and pg/ml for women. Plasma triglycerides, total cholesterol, and high density lipoprotein (HDL) cholesterol concentrations were analysed by routine clinical colorimetric technique. 75 Se-labelled homocholic acid-taurine This test was performed according to the method described by Thaysen et al. 27 Briefly, a capsule containing 0.3 MBq 75 SeHCAT (Amersham AB, Sweden) was swallowed with a glass of water after an overnight fast. Measurements were performed using an uncollimated γ camera (Starcam System, General Electrics, Milwaukee, Wisconsin, USA) with the patient in a supine position and the γ camera positioned at a distance of 60 cm. The basal value (100%) was obtained with a measurement after 3 h. A new measurement was obtained after 7 days. The abdominal retention was calculated as a fraction of the basal value. A retention value of >10% on day 7 was considered as normal, 39 even though some centres use the cut-off value of 15%. 29 In the treatment part of this study, we chose to include patients with 75 SeHCAT up to 20%, as the optimal cut-off value to determine a positive treatment response in patients with IBS has not been studied. Colonic transit time measurement Colonic transit time was measured by use of a validated method using radio-opaque markers as described previously. 47 Briefly, 10 radio-opaque markers were ingested daily for 6 consecutive days. On the 6th day the patients divided the daily dose of markers and ingested five markers in the morning and five in the evening in order to better define patients with accelerated transit. On the 7th day, a fluoroscopy was performed in the morning and remaining markers were counted (Exposcop 7000 Compact, Ziehm GmbH, Nüremberg, Germany). The colonic transit time expressed in days was calculated by dividing the number of retained radiopaque markers by the daily dose number; that is, 10. The sum of the caecal and ascending regions was considered as right colonic transit, the transverse colon transit assessed on its own, and the anatomical regions distal to the splenic flexure considered as left colonic transit. In order to minimise potential pitfalls with this technique, the methodology has been optimised at our unit in several previous studies Rectal sensitivity In order to evaluate rectal sensitivity, a balloon distension test was performed, using a barostat (Dual Drive Barostat, Distender Series II; G & J Electronics, Toronto, Ontario, Canada), as described elsewhere. 4 We used phasic distensions with stepwise increments starting at the operating pressure (minimal distending pressure +2 mm Hg) and increasing 5 mm Hg until the subject reported pain or when a pressure of 70 mm Hg was reached. For this study only pressure thresholds (mm Hg) for pain were used for the analyses. Statistical methods Data are presented as mean±sd or as proportions (%), unless otherwise stated. Means were compared between two groups using the Student t test, whereas nominal data were compared by use of the Pearson s χ 2 test. Correlations were calculated using Spearman s correlation coefficients. Comparison of mean values between multiple groups was done by analysis of variance (ANOVA), with post hoc group differences corrected for multiple comparisons (Bonferroni correction). All analyses in the treatment part of this study were performed on an intention to treat basis, including all patients who completed the baseline questionnaires. For dropouts we used the principle of last observation carried forward technique meaning that the missing data post treatment were imputed from baseline assessments and included in the final analyses. Repeated measures ANOVA was used to assess the treatment effect (IBS-SSS scores), with Bonferroni corrections used for post hoc comparisons between baseline scores and the biweekly symptom scores during the treatment period. Statistical significance was accepted at the 5% level. RESULTS Subjects Altogether 141 patients with IBS according to the Rome II criteria 37 were included in the study (102 women; mean age 35.3 (range 17 71) years). Based on the Rome II classification 50 patients (35%) fulfilled the criteria for IBS-A (38 women), 26 IBS-C (18%) (22 women) and 65 IBS-D (46%) (42 women). All patients completed the 75 SeHCAT test, blood samples were obtained from 133 patients (C4c n=133; FGF19 n=118) and 66 subjects underwent a colonic transit time measurement and a rectal sensitivity test. The 75 SeHCAT results were compared with a group of 29 healthy controls without GI symptoms (22 women; mean age 40 (range 25 55) years) 39 and the C4 and FGF19 values with a group consisting of 435 healthy individuals (222 women; mean age 49 (range 20 89) years) SeHCAT, C4c and FGF19: IBS versus controls Patients with IBS had lower 75 SeHCAT retention values at day 7 than control subjects (28±19% vs 39±18%; p=0.005), but this only reached statistical significance for men (18±12% vs 34±12%; p=0.002) and only a tendency in the same direction for women (32±21% vs 40±20%; p=0.08), which might be explained by a different distribution of IBS subgroups in men and women, particularly more patients with IBS-C in the female IBS group (χ 2 =26.4, df=3, p<0.0001). Patients with IBS-D and patients with IBS-A had lower 75 SeHCAT retention values than healthy controls and patients with IBS-C, with no difference between patients with IBS-C and healthy controls (ANOVA: F=7.23; p<0.0001) (figure 1). Twenty-six patients with IBS (18%) had abnormal 75 SeHCAT retention at day 7 (<10%), where the distribution between subtypes was 8/52 patients with IBS-A (15%), 3/25 with IBS-C (12%) and 15/64 with IBS-D (23%) (χ 2 =2.08, df=2, p=0.35). There was a trend (χ 2 =3.42, df=1, p=0.06) for abnormal 75 SeHCAT retention to be more common in men (11/39 (28%)) than in women (15/102 (15%)). When using 75 SeHCAT retention at day 7 <15% to define an abnormal test, 45 patients with IBS (32%) had an abnormal test. Fourteen patients (10%) had 75 SeHCAT retention at day 7 <5% (10 patients with IBS-D, 3 with IBS-A and 1 with IBS-C). Patients with IBS also demonstrated higher C4c levels than healthy controls, in men (7.2±12.9 vs 3.6±2.9 mg/mol; p<0.0001) and women (4.3±3.3 vs 2.8±1.8 mg/mol; p<0.0001). ANOVA comparing IBS subgroups with healthy controls demonstrated group differences in C4c levels (F=9.77; p<0.0001), where post hoc comparisons revealed higher C4c values in patients with IBS-D than in healthy controls (5.9±10.1 vs 3.1±2.5 mg/mol; p<0.0001), but with no significant differences between the other groups. By using normal values from the healthy control group (5 95% centile), 30/133 patients with IBS (23%) had elevated 86 Bajor A, et al. Gut 2015;64: doi: /gutjnl
4 Downloaded from on May 8, Published by group.bmj.com Neurogastroenterology Characteristics of the IBS subgroups are summarised in table 1. Of the patients who had an abnormal 75 SeHCAT retention value at day 7 (<10%), 11/24 also had abnormally elevated C4c values, and of patients with high C4c, 11/30 also had abnormal 75 SeHCAT retention at day 7 (κ=0.26, p=0.003). In the patients moderately strong correlations were seen between the 75 SeHCAT retention values at day 7 and the C4 (r=-0.34; p<0.0001), as well as the C4c concentrations (r=0.29; p=0.001), but not with FGF19 (r=0.13; p=0.15). FGF19 levels correlated significantly with C4 (r= 0.24; p=0.01) and C4c values (r= 0.23; p=0.01). The correlation between C4c and C4 was strong (r=0.964, p<0.0001). Figure 1 75 SeHCAT retention values in patients with IBS and healthy controls. Patients with IBS-D and patients with IBS-A had lower 75 SeHCAT retention values than healthy controls and patients with IBS-C, with no difference between patients with IBS-C and healthy controls. The box and whisker plots display the 10th, 25th, 50th, 75th and 90th centiles, and outliers are also shown. *p<0.05, ** p<0.01. IBS-A, alternating type IBS; IBS-C, constipation-predominant IBS; IBS-D, diarrhoea-predominant IBS; 75 SeHCAT, 75 Se-labelled homocholic acid-taurine. C4c values, indicating increased bile acid synthesis. Only 3/133 patients with IBS (2%) had low C4c values. The distribution of patients with elevated C4c levels did not differ significantly between IBS subgroups (IBS-A 11/50; IBS-C 8/24; IBS-D 11/59) (χ 2 =2.12, df=2, p=0.35). FGF19 values did not differ between patients with IBS and controls, neither in men (138±95 vs 147±89 pg/ml; ns), nor in women (141±105 vs 144±88 pg/ml; ns), and no differences between IBS subtypes and healthy controls were detected (ANOVA: F=0.92; p=0.43). Low FGF19 values, based on the normal values from the control group (5 95% centile) were seen in 14/118 patients with IBS (12%), and only 5/118 patients had high values (4%). The distribution of patients with low FGF19 levels did not differ between IBS subgroups (χ 2 =0.83, df=2, p=0.66). 75 SeHCAT retention values, C4c and FGF19 concentrations, and clinical parameters Patients with IBS with 75 SeHCAT retention at day 7 <10% were characterised by having more frequent stools, accelerated colonic transit time, especially in the left colon, rectal hyposensitivity, a higher BMI, elevated triglyceride, higher C4c and lower FGF19, and HDL cholesterol levels. However, patients with IBS and abnormal 75 SeHCAT retention at day 7 did not rate the severity of their IBS symptoms on GSRS-IBS as being more severe than patients with normal 75 SeHCAT values; on the contrary the severity of bloating tended to be less severe in patients with low 75 SeHCAT values (table 2). In line with this, 75 SeHCAT values correlated significantly with colonic transit time (figure 2), BMI (r= 0.28; p=0.01), stool frequency (r= 0.27; p=0.001) and stool form (r= 0.19; p=0.03) but not with any of the GI symptom severity measures (GSRS-IBS; data not shown). Using alternative cut-off levels when defining abnormal 75 SeHCAT retention at day 7 (<15% or <5%, respectively) yielded similar group differences between patients with normal and abnormal retention values as for 75 SeHCAT retention at day 7 <10% (data not shown). When evaluating IBS subgroups separately, a significant association between 75 SeHCAT values and colonic transit was only seen in the IBS-D group (r=0.58; p=0.001), whereas only borderline significance was found in IBS-A (r=0.38; p=0.06) and no significant association in IBS-C (r=0.17; p=0.17; p=0.6). In line with this, only in the IBS-D group Table 1 Characteristics of IBS subgroups according to Rome II criteria IBS-A (n=52) IBS-C (n=25) IBS-D (n=64) p Value (ANOVA) Age, years 36.1 (12.9) 34.7 (13.9) 34.7 (12.2) SeHCAT, % 25 (14) 41 (25) 25 (19) C4, ng/ml 24.1 (21.2) 25.4 (24.4) 29.0 (44.1) 0.74 C4c, mg/mol 4.2 (3.1) 5.0 (4.1) 5.9 (10.1) 0.51 FGF19, pg/ml (122.4) (69.1) (88.5) 0.33 BMI, kg/m (4.5) 23.1 (3.3) 23.8 (4.1) 0.76 Stool frequency (stools/day) 2.1 (1.0) 1.4 (0.8) 2.5 (1.4) Stool consistency (BSF score) 4.1 (1.0) 3.5 (1.4) 4.8 (1.0) Colonic transit time, days 1.5 (0.9) 2.4 (1.3) 1.5 (1.3) 0.03 Rectal pain threshold, mm Hg 40.7 (10.9) 40.0 (14.1) 42.0 (14.2) 0.89 GSRS-IBS abdominal pain 4.4 (1.2) 4.2 (1.5) 4.0 (1.3) 0.41 GSRS-IBS bloating 4.8 (1.3) 4.8 (1.6) 4.3 (1.4) 0.13 GSRS-IBS diarrhoea 4.2 (1.2) 2.9 (0.6) 4.0 (1.1) GSRS-IBS constipation 3.3 (1.5) 4.4 (2.1) 1.5 (1.0) GSRS-IBS satiety 2.9 (1.7) 2.8 (1.2) 2.5 (1.6) 0.33 Significant differences between the IBS subgroups (ANOVA; p<0.05) shown with bold style. Mean (SD). ANOVA, analysis of variance; BMI, body mass index; BSF, Bristol Stool Form; C4, 7α-hydroxy-4-cholesten-3-one; C4c, C4 corrected for cholesterol; FGF19, fibroblast growth factor 19; GSRS-IBS, Gastrointestinal Symptom Rating Scale-IBS; IBS-A, alternating type IBS; IBS-C, constipation-predominant IBS; IBS-D, diarrhoea-predominant IBS; 75 SeHCAT, 75 Se-labelled homocholic acid-taurine. Bajor A, et al. Gut 2015;64: doi: /gutjnl
5 Neurogastroenterology Downloaded from on May 8, Published by group.bmj.com Table 2 Comparisons between patients with IBS with and without abnormal 75 SeHCAT retention (<10%) 75 SeHCAT<10% (n=26) 75 SeHCAT>10% (n=115) p Value Age, years 42.7 (13.1) 33.5 (12.0) C4, ng/ml 59.4 (64.6) 19.3 (14.1) C4c, mg/mol 11.5 (14.8) 3.7 (2.3) 0.02 FGF19, pg/ml 99.2 (53.3) (107.7) Total cholesterol, mmol/l 5.4 (1.1) 5.2 (1.3) 0.55 Triglyceride, mmol/l 1.6 (0.9) 1.1 (0.7) HDL-cholesterol, mmol/l 1.5 (0.4) 1.8 (0.5) 0.02 BMI, kg/m (4.9) 23.1 (3.7) Stool frequency (stools/day) 2.9 (1.7) 2.0 (1) 0.01 Stool consistency (BSF score) 4.6 (1.4) 4.3 (1.1) 0.21 Colonic transit time, days 0.9 (0.7) 1.9 (1.2.) Right colon, days 0.3 (0.3) 0.5 (0.3) 0.07 Transverse colon, days 0.2 (0.2) 0.3 (0.3) 0.22 Left colon, days 0.4 (0.5) 0.9 (0.8) Rectal pain threshold, mm Hg 48.7 (12.7) 38.9 (12.0) GSRS-IBS abdominal pain 4.3 (1.3) 4.2 (1.3) 0.66 GSRS-IBS bloating 4.0 (1.5) 4.7 (1.3) 0.03 GSRS-IBS diarrhoea 4.0 (1.4) 3.9 (1.1) 0.74 GSRS-IBS constipation 2.2 (1.8) 2.8(1.8) 0.12 GSRS-IBS satiety 2.3 (1.5) 2.8 (1.6) 0.12 Significant differences (p<0.05) shown with bold style. Mean (SD). BMI, body mass index; BSF, Bristol Stool Form; C4, 7α-hydroxy-4-cholesten-3-one; C4c, C4 corrected for cholesterol; FGF19, fibroblast growth factor 19; GSRS-IBS, Gastrointestinal Symptom Rating Scale-IBS; 75 SeHCAT, 75 Se-labelled homocholic acid-taurine. significant correlations between 75 SeHCAT values and stool frequency (r= 0.25; p=0.04) and form (r= 0.31; p=0.01) were noted. Fewer differences in clinical parameters were seen when comparing patients with IBS with normal/low (n=103) and high (n=30) C4c values. Only higher triglyceride, lower HDL cholesterol and FGF19 levels, and a higher BMI were characteristic of patients with IBS with elevated C4c concentrations. No differences in symptom severity (GSRS-IBS) were noted between patients with normal and elevated C4c, except for higher perceived severity of constipation in the group with elevated C4c (table 3). In line with these findings, C4c only correlated significantly with FGF19 (r= 0.23: p=0.02), triglycerides (r=0.29; p=0.001), HDL cholesterol (r= 0.20; p=0.02), BMI (r=0.20; p=0.02) and stool frequency (r=0.22; p=0.01). Figure 2 Correlation between colonic transit time and 75 SeHCAT retention values in patients with IBS. When comparing patients with IBS with low (n=14) FGF19 levels with the rest of the patients with IBS (n=104), no significant group differences were noted (data not shown). Open-label treatment with colestipol Of the 141 investigated patients, 57 (40%) had a 75 SeHCAT retention value < 20%, and 27 of these (47%) agreed to Table 3 Comparisons between patients with IBS with and without high C4c values (>8.0 mg/mol for men and >6.0 mg/mol for women) C4c high (n=30) C4c normal/low (n=103) p Value Age, years 39.0 (13.3) 34.2 (12.7) SeHCAT, % 23 (23) 30 (18) 0.08 FGF19, pg/ml (66.2) (108.1) 0.01 Total cholesterol, mmol/l 5.3 (1.5) 5.2 (1.1) 0.92 Triglyceride, mmol/l 1.7 (1.1) 1.1 (0.6) HDL-cholesterol, mmol/l 1.5 (0.4) 1.8 (0.5) BMI, kg/m (4.5) 23.2 (3.9) Stool frequency (stools/day) 2.3 (1.4) 2.1 (1.2) 0.47 Stool consistency (BSF score) 4.0 (1.3) 4.4 (1.1) 0.12 Colonic transit time, days 1.8 (1.2) 1.7 (1.2) 0.85 Rectal pain threshold, mm Hg 39.6 (12.8) 41.8 (13.1) 0.57 GSRS-IBS abdominal pain 4.1 (1.5) 4.3 (1.3) 0.48 GSRS-IBS bloating 4.7 (1.4) 4.5(1.4) 0.62 GSRS-IBS diarrhoea 4.0 (1.4) 3.9 (1.2) 0.94 GSRS-IBS constipation 3.4 (1.9) 2.5(1.7) 0.02 GSRS-IBS satiety 2.9 (1.6) 2.7 (1.6) 0.61 Significant differences (p<0.05) shown with bold style. Mean (SD). BMI, body mass index; BSF, Bristol Stool Form; C4, 7α-hydroxy-4-cholesten-3-one; C4c, C4 corrected for cholesterol; FGF19, fibroblast growth factor 19; GSRS-IBS, Gastrointestinal Symptom Rating Scale-IBS; 75 SeHCAT, 75 Se-labelled homocholic acid-taurine. 88 Bajor A, et al. Gut 2015;64: doi: /gutjnl
6 Downloaded from on May 8, Published by group.bmj.com participate in the open-label treatment trial with colestipol. Twenty-three patients completed the 8-week treatment period, whereas four patients discontinued prematurely, one after 3 weeks, two after 4 weeks and one after 6 weeks. All four stated that lack of effect was the reason for discontinuing the medication. During the treatment IBS-SSS scores were reduced (F=10.38; p<0.001), reaching statistical significance at week 6 and week 8 (figure 3A). The stool frequency was reduced from baseline to week 8 (2.8±1.4 stools/day vs 2.3±1.2 stools/day; p=0.03), but the stool form remained unaltered (Bristol Stool Form score 4.3 ±1.4 vs 3.9±1.1; p=0.24). Fifteen of the 27 patients (55%) fulfilled criteria for treatment response (reporting adequate relief 50% of weeks 5 8). The weekly responder rate is shown in figure 3B. There were no differences in any of the baseline parameters between responders and non-responders (table 4), and no differences in the clinical response were seen between patients with 75 SeHCAT retention values at baseline <10% and those with 10 20% (data not shown). The mean colestipol intake per week increased from 21±5 g at week 1 to 74±41 g at week 8, but the colestipol dose had already reached a peak value after week 7 (figure 3C). Neurogastroenterology DISCUSSION This is the first large scale study assessing abnormalities in bile acid absorption and synthesis in phenotypically well-characterised patients with IBS, by use of the 75 SeHCATretention test, as well as C4c and FGF19 concentration in serum. A substantial proportion of patients with IBS had findings consistent with abnormalities in bile acid absorption and/or synthesis, associated with more frequent and looser bowel movements and an accelerated colonic transit time, as well as with overweight and abnormal serum lipid profiles. The major importance of our findings is that they strengthen the involvement of increased bile acid exposure in the colon as a partial mechanism for symptom generation in patients with especially non-constipated IBS, that is, IBS-D and IBS-A. Few studies have focused on the role of bile acids regarding symptom generation in functional GI disorders apart from some early studies suggesting a role for bile acids in the GI motor 15 and secretory responses 14 seen in IBS pathophysiology. BAM diagnosed with abnormal 75 SeHCAT retention has also been suggested to be a frequent finding in patients seeking healthcare for unexplained diarrhoea, of which some satisfy diagnostic criteria for IBS-D In one recent provocative study, IBS-D was proposed to be a fiction, since the majority of patients included was found to have another diagnosis explaining their symptoms, where BAM was the most common alternative diagnosis (68%), 54 indicating that patients with predominant and severe diarrhoea need a more thorough clinical workup than other patients with suspected functional bowel disorder. 55 Recently, the Mayo group used measurement of C4 in serum to demonstrate increased bile acid synthesis in patients with IBS-D, and found that a substantial proportion of these patients had evidence of BAM, whereas this was not seen in patients with IBS-C, and in a follow-up study they also showed that unconjugated faecal bile acids were associated with stool characteristics in IBS. 56 Our study expands on these previous studies by including a larger group of well-characterised patients with IBS, including all IBS subtypes, and by using complementary techniques to define abnormalities in bile acid absorption and synthesis. A considerable proportion of our patients had demonstrable abnormalities, and this was seen in the IBS-D group, and in the IBS-A group, which has not been reported previously. This fits well with recent transit studies, where a proportion of Figure 3 Treatment response to colestipol treatment demonstrated as the biweekly IBS Severity Scoring System (IBS-SSS) scores (mean±sd) (A) and the weekly proportion of patients reporting adequate relief of their IBS symptoms (B), as well as the weekly colestipol dose in the treatment group (mean±sd) (C). ** p<0.01 versus baseline. patients with IBS with mixed/alternating bowel habit has accelerated colonic transit, just like patients with diarrhoea predominance There was a substantial overlap between abnormal 75 SeHCATretention (18%) and an increased C4c (23%), but also a considerable number of subjects with only one of these tests being abnormal, indicating that the tests are complementary, but not interchangeable for detection of abnormalities in bile acid homoeostasis. Abnormal 75 SeHCAT retention values were more closely associated with bowel habit in our IBS population, which make us believe that this is a better method to use in the evaluation of patients with IBS than C4c. Among the key symptoms of IBS, that is, abdominal pain and/ or discomfort and abnormal bowel habit, increased bile acid load to the colon seems to be of importance for loose and frequent stools in IBS, whereas pain, bloating and abdominal Bajor A, et al. Gut 2015;64: doi: /gutjnl
7 Neurogastroenterology Downloaded from on May 8, Published by group.bmj.com Table 4 Comparisons between responders and non-responders to colestipol treatment (responder definition: reporting adequate relief 50% of weeks 5 8) Responders (n=15) Non-responders (n=12) p Value Age, years 42.3 (11.5) 40.2 (15.8) SeHCAT, % 8.8 (5.0) 10.4 (4.9) 0.43 C4, ng/ml 55.3 (76.7) 31.5 (24.3) 0.31 C4c, mg/mol 10.3 (18.9) 6.0 (3 4) 0.45 FGF19, pg/ml (109.1)) (71.9) 0.99 Total cholesterol, mmol/l 4.83 (1.43) 6.5 (1.6) 0.02 Triglyceride, mmol/l 1.7 (1.3) 1.5 (1.0) 0.68 HDL-cholesterol, mmol/l 1.6 (0.4) 1.4 (0.2) 0.10 BMI, kg/m (4.9) 24.3 (5.0) 0.49 Stool frequency (stools/day) 2.6 (1.2) 3.1 (1.5) 0.37 Stool consistency (BSF score) 4.0 (1.3) 4.7 (1.5) 0.22 Colonic transit time, days 0.8 (0.4) 1.2 (0.8) 0.22 Rectal pain threshold, mm Hg 42.0 (14.0) 39.4 (13.0) 0.73 Significant differences (p<0.05) shown with bold style. Mean (SD). BMI, body mass index; BSF, Bristol Stool Form; C4, 7α-hydroxy-4-cholesten-3-one; C4c, C4 corrected for cholesterol; FGF19, fibroblast growth factor 19; 75 SeHCAT, 75 Se-labelled homocholic acid-taurine. discomfort were not associated with abnormal 75 SeHCAT retention or serum C4c levels. This is in agreement with a French study, where faecal bile acid concentration was associated with stool frequency and consistency, but not with pain and bloating. 58 Moreover, genetic variants in the Klotho β gene, encoding a protein serving as cofactor for FGFR-4, the presumable receptor for FGF19, have been demonstrated in patients with IBS-D and found to be associated with faster colonic transit in these patients, further strengthening the importance of bile acids for colonic transit and bowel habit in IBS. 59 Treatment options modulating the bile acid exposure to the colon are under evaluation. An ileal bile acid transporter inhibitor, elobixibat (formerly A3309), enhancing bile acid delivery to the colon accelerates colonic transit and results in looser and more frequent bowel movements in patients with constipation Moreover, a delayed-release oral formulation of the bile acid chenodeoxycholate was shown to accelerate colonic transit and improve symptoms of constipation in women with IBS-C. 17 For patients with IBS-D, the bile acid sequestrant colesevelam has been evaluated in a small proof-of-concept study with a tendency to delay colonic transit and improve symptoms of diarrhoea, and the response seemed to be influenced by genetic variants in proteins involved in the FGF19-mediated negative feedback of hepatic bile acid synthesis. 16 In the present study we evaluated the bile acid binding agent colestipol in a small group of patients with IBS with 75 SeHCAT retention below 20%, and found a favourable effect on IBS symptoms in approximately half of the subjects. However, this should only be regarded as a pilot study, which has to be confirmed by proper double-blind, placebo controlled trials, but the promising results and other recent treatment options modulating bile acid delivery to the colon, supports the concept that bile acid load to the colon is of importance for symptom generation in IBS and other functional bowel disorders. Disappointingly no factors predicting a positive clinical response to colestipol were detected and the effect on bowel habit was relatively modest. It is noteworthy that the perceived symptom severity was not linked to either the 75 SeHCAT retention, or the C4c. Only the objective characterisation of symptoms, that is, frequency of bowel movements and to some extent stool form was associated with bile acid exposure to the colon in our IBS sample. With the current study design, the underlying mechanisms for other IBS symptoms could not be revealed, but visceral hypersensitivity and brain-gut dysfunction are putative candidates Interestingly, the pain threshold for rectal distension was higher in patients with low 75 SeHCAT retention values compared with those with normal ones. As these same patients also tended to be overweight, this finding is in line with a previous study that found a higher threshold for rectal pain in patients with BMI> However, opposite results also exist with bile acids increasing colonic sensitivity, 9 so the effect of bile acids on colorectal sensitivity needs to be further addressed in future studies. One potential explanation for these somewhat surprising findings is that bile acids entering the colon and not visceral hypersensitivity is of relevance in one particular subset of patients with IBS, hence low 75 SeHCAT retention values and normal/high rectal pain thresholds in these patients, whereas visceral hypersensitivity and not colonic bile acids is of importance in another group of patients with IBS, hence low rectal pain thresholds and normal 75 SeHCAT retention values in this group. The association between a low 75 SeHCAT retention value and an increased C4c and higher BMI, is in line with recent findings demonstrating increased BMI and a higher level of bile acid synthesis in patients with IBS-D. 18 Moreover patients with idiopathic BAM often tend to be overweight and have accelerated gut transit, 48 and an association between BMI and GI transit in health and different diseases has been observed The cause and effect needs to be determined in future studies, but based on current knowledge it seems likely that high BMI may lead to increased bile acid synthesis and an increased bile acid delivery to colon, which accelerates transit resulting in looser and more frequent stools. Bile acids, when absorbed into the enterocytes, are believed to trigger the synthesis and secretion of FGF19, which in turn may inhibit hepatic bile acid synthesis We found an inverse correlation between plasma FGF19 and the C4c. If patients with idiopathic BAM have an inadequately low FGF19 response to absorbed bile acids into the enterocyte and a compensatory high hepatic synthesis this could result in an enlarged bile acid pool. This impaired FGF19 feedback inhibition has recently been proposed as a major mechanism in BAM. 65 However, in our group of patients with IBS FGF19 levels were not different when compared with the healthy controls despite differences in C4c, whereas patients with IBS and low 75 SeHCAT retention values and/or high C4c levels demonstrated reduced FGF19 levels, indirectly implicating a potential role for defect FGF19 feedback inhibition in subgroups of patients with IBS as well. This is in line with a recent study in patients with diarrhoea, where correlations between FGF19, C4 and 75 SeHCAT were most marked in patients with low 75 SeHCAT retention values. 66 To conclude, the 75 SeHCAT test, as a measure of the bile acid turnover rate, correlates with hepatic bile acid synthesis and relates to bowel habit and colonic transit time in patients with IBS. The associations with BMI and with markers of general metabolism such as plasma lipid profiles and bile acid metabolism deserve further investigations, including intervention trials. The positive symptomatic response to open label treatment with bile acid binders in patients with IBS with low 75 SeHCAT values supports a role of bile acids in IBS symptomatology, but placebo-controlled studies are warranted. Acknowledgements The authors thank Ingela Arvidsson for expert technical assistance and RN Jenny Lövdahl for patient management. 90 Bajor A, et al. Gut 2015;64: doi: /gutjnl
8 Downloaded from on May 8, Published by group.bmj.com Neurogastroenterology Contributors AB: study concept and design, acquisition of data, analysis and interpretation of data; drafting of the manuscript, critical revision of the manuscript for important intellectual content. HT: analysis and interpretation of data, critical revision of the manuscript. MR and K-AU: acquisition of data, critical revision of the manuscript. MS: study concept and design, acquisition of data, analysis and interpretation of data; critical revision of the manuscript. Funding This study was supported by the Swedish Medical Research Council (grants 13409, and ), Region Västra Götaland ((KVG project Nr 84), the Marianne and Marcus Wallenberg Foundation, University of Gothenburg, Centre for Person-Centred Care (GPCC), Sahlgrenska Academy, University of Gothenburg and by the Faculty of Medicine, University of Gothenburg and by Stockholm County Council (ALF). Competing interests AB and K-AU have served as Consultants/Advisory board members for Albireo and GE Health Care. MR has received a research grant and served as a Consultant for Albireo. HT has served as a Consultant/Advisory Board member for Almirall, Danone and Shire. MS has received unrestricted research grants from Danone and AstraZeneca, and served as a Consultant/Advisory Board member for Danone, Novartis, Almirall, Albireo and Shire. Ethics approval The Regional Ethical Review Boards in Gothenburg and Stockholm. Provenance and peer review Not commissioned; externally peer reviewed. REFERENCES 1 Khan S, Chang L. Diagnosis and management of IBS. Nat Rev Gastroenterol Hepatol 2010;7: Lovell RM, Ford AC. Global prevalence of and risk factors for irritable bowel syndrome: a meta-analysis. Clin Gastroenterol Hepatol 2012;10: e4. 3 Tornblom H, Van Oudenhove L, Sadik R, et al. Colonic transit time and IBS symptoms: what s the link? Am J Gastroenterol 2012;107: Posserud I, Syrous A, Lindstrom L, et al. Altered rectal perception in irritable bowel syndrome is associated with symptom severity. Gastroenterology 2007;133: Larsson MH, Simren M, Thomas EA, et al. Elevated motility-related transmucosal potential difference in the upper small intestine in the irritable bowel syndrome. Neurogastroenterol Motil 2007;19: Ohman L, Simren M. New insights into the pathogenesis and pathophysiology of irritable bowel syndrome. Dig Liver Dis 2007;39: Ohman L, Simren M. Pathogenesis of IBS: role of inflammation, immunity and neuroimmune interactions. Nat Rev Gastroenterol Hepatol 2010;7: Camilleri M. Mechanisms in IBS: something old, something new, something borrowed. Neurogastroenterol Motil 2005;17: Bampton PA, Dinning PG, Kennedy ML, et al. The proximal colonic motor response to rectal mechanical and chemical stimulation. Am J Physiol Gastrointest Liver Physiol 2002;282:G Mekjian HS, Phillips SF, Hofmann AF. Colonic secretion of water and electrolytes induced by bile acids: perfusion studies in man. J Clin Invest 1971;50: Wingate DL, Phillips SF, Hofmann AF. Effect of glycine-conjugated bile acids with and without lecithin on water and glucose absorption in perfused human jejunum. J Clin Invest 1973;52: Odunsi-Shiyanbade ST, Camilleri M, McKinzie S, et al. Effects of chenodeoxycholate and a bile acid sequestrant, colesevelam, on intestinal transit and bowel function. Clin Gastroenterol Hepatol 2010;8: Bajor A, Gillberg PG, Abrahamsson H. Bile acids: short and long term effects in the intestine. Scand J Gastroenterol 2010;45: Oddsson E, Rask-Madsen J, Krag E. A secretory epithelium of the small intestine with increased sensitivity to bile acids in irritable bowel syndrome associated with diarrhoea. Scand J Gastroenterol 1978;13: Taylor I, Basu P, Hammond P, et al. Effect of bile acid perfusion on colonic motor function in patients with the irritable colon syndrome. Gut 1980;21: Wong BS, Camilleri M, Carlson PJ, et al. Pharmacogenetics of the effects of colesevelam on colonic transit in irritable bowel syndrome with diarrhea. Dig Dis Sci 2012;57: Rao AS, Wong BS, Camilleri M, et al. Chenodeoxycholate in females with irritable bowel syndrome-constipation: a pharmacodynamic and pharmacogenetic analysis. Gastroenterology 2010;139: , 58 e1. 18 Wong BS, Camilleri M, Carlson P, et al. Increased bile acid biosynthesis is associated with irritable bowel syndrome with diarrhea. Clin Gastroenterol Hepatol 2012;10: e3. 19 Camilleri M, Nadeau A, Tremaine WJ, et al. Measurement of serum 7alpha-hydroxy-4-cholesten-3-one (or 7alphaC4), a surrogate test for bile acid malabsorption in health, ileal disease and irritable bowel syndrome using liquid chromatography-tandem mass spectrometry. Neurogastroenterol Motil 2009;21:734 e Aldini R, Roda A, Festi D, et al. Bile acid malabsorption and bile acid diarrhea in intestinal resection. Dig Dis Sci 1982;27: Jacobsen O, Hojgaard L, Hylander Moller E, et al. Effect of enterocoated cholestyramine on bowel habit after ileal resection: a double blind crossover study. Br Med J (Clin Res Ed) 1985;290: Borghede MK, Schlutter JM, Agnholt JS, et al. Bile acid malabsorption investigated by selenium-75-homocholic acid taurine ((75)SeHCAT) scans: causes and treatment responses to cholestyramine in 298 patients with chronic watery diarrhoea. Eur J Intern Med 2011;22:e Galatola G. The prevalence of bile acid malabsorption in irritable bowel syndrome and the effect of cholestyramine: an uncontrolled open multicentre study. Eur J Gastroenterol Hepatol 1992;4: Wildt S, Norby Rasmussen S, Lysgard Madsen J, et al. Bile acid malabsorption in patients with chronic diarrhoea: clinical value of SeHCAT test. Scand J Gastroenterol 2003;38: Fernandez-Banares F, Esteve M, Salas A, et al. Systematic evaluation of the causes of chronic watery diarrhea with functional characteristics. Am J Gastroenterol 2007;102: Wedlake L, A Hern R, Russell D, et al. Systematic review: the prevalence of idiopathic bile acid malabsorption (I-BAM) as diagnosed by SeHCAT scanning in patients with diarrhoea-predominant irritable bowel syndrome (IBS). Aliment Pharmacol Ther 2009;30: Thaysen EH, Orholm M, Arnfred T, et al. Assessment of ileal function by abdominal counting of the retention of a gamma emitting bile acid analogue. Gut 1982;23: Sciarretta G, Fagioli G, Furno A, et al. 75Se HCAT test in the detection of bile acid malabsorption in functional diarrhoea and its correlation with small bowel transit. Gut 1987;28: Vijayvargiya P, Camilleri M, Shin A, et al. Methods for diagnosis of bile acid malabsorption in clinical practice. Clin Gastroenterol Hepatol 2013;11: Brydon WG, Nyhlin H, Eastwood MA, et al. Serum 7 alpha-hydroxy-4-cholesten-3-one and selenohomocholyltaurine (SeHCAT) whole body retention in the assessment of bile acid induced diarrhoea. Eur J Gastroenterol Hepatol 1996;8: Eusufzai S, Axelson M, Angelin B, et al. Serum 7 alpha-hydroxy-4-cholesten-3-one concentrations in the evaluation of bile acid malabsorption in patients with diarrhoea: correlation to SeHCAT test. Gut 1993;34: Sauter GH, Munzing W, von Ritter C, et al. Bile acid malabsorption as a cause of chronic diarrhea: diagnostic value of 7alpha-hydroxy-4-cholesten-3-one in serum. Dig Dis Sci 1999;44: Bajor A, Kilander A, Fae A, et al. Normal or increased bile acid uptake in isolated mucosa from patients with bile acid malabsorption. Eur J Gastroenterol Hepatol 2006;18: Bajor A, Kilander A, Sjovall H, et al. The bile acid turnover rate assessed with the (75)SeHCAT test is stable in chronic diarrhoea but slightly decreased in healthy subjects after a long period of time. Dig Dis Sci 2008;53: Jones S. Mini-review: endocrine actions of fibroblast growth factor 19. Mol Pharm 2008;5: Chiang JY. Bile acids: regulation of synthesis. J Lipid Res 2009;50: Thompson WG, Longstreth GF, Drossman DA, et al. Functional bowel disorders and functional abdominal pain. Gut 1999;45(Suppl 2):II Galman C, Angelin B, Rudling M. Pronounced variation in bile acid synthesis in humans is related to gender, hypertriglyceridaemia and circulating levels of fibroblast growth factor 19. J Intern Med 2011;270: Ung KA, Kilander A, Nilsson O, et al. Long-term course in collagenous colitis and the impact of bile acid malabsorption and bile acid sequestrants on histopathology and clinical features. Scand J Gastroenterol 2001;36: Wiklund IK, Fullerton S, Hawkey CJ, et al. An irritable bowel syndrome-specific symptom questionnaire: development and validation. Scand J Gastroenterol 2003;38: O Donnell LJ, Virjee J, Heaton KW. Detection of pseudodiarrhoea by simple clinical assessment of intestinal transit rate. BMJ 1990;300: Francis CY, Morris J, Whorwell PJ. The irritable bowel severity scoring system: a simple method of monitoring irritable bowel syndrome and its progress. Aliment Pharmacol Ther 1997;11: Irvine EJ, Whitehead WE, Chey WD, et al. Design of treatment trials for functional gastrointestinal disorders. Gastroenterology 2006;130: Galman C, Arvidsson I, Angelin B, et al. Monitoring hepatic cholesterol 7alpha-hydroxylase activity by assay of the stable bile acid intermediate 7alpha-hydroxy-4-cholesten-3-one in peripheral blood. J Lipid Res 2003;44: Galman C, Angelin B, Rudling M. Bile acid synthesis in humans has a rapid diurnal variation that is asynchronous with cholesterol synthesis. Gastroenterology 2005;129: Lundasen T, Galman C, Angelin B, et al. Circulating intestinal fibroblast growth factor 19 has a pronounced diurnal variation and modulates hepatic bile acid synthesis in man. J Intern Med 2006;260: Sadik R, Abrahamsson H, Stotzer PO. Gender differences in gut transit shown with a newly developed radiological procedure. Scand J Gastroenterol 2003;38: Bajor A, et al. Gut 2015;64: doi: /gutjnl
9 Neurogastroenterology Downloaded from on May 8, Published by group.bmj.com 48 Sadik R, Abrahamsson H, Ung KA, et al. Accelerated regional bowel transit and overweight shown in idiopathic bile acid malabsorption. Am J Gastroenterol 2004;99: Sadik R, Bjornsson E, Simren M. The relationship between symptoms, body mass index, gastrointestinal transit and stool frequency in patients with irritable bowel syndrome. Eur J Gastroenterol Hepatol 2010;22: Sadik R, Stotzer PO, Simren M, et al. Gastrointestinal transit abnormalities are frequently detected in patients with unexplained GI symptoms at a tertiary centre. Neurogastroenterol Motil 2008;20: Smith MJ, Cherian P, Raju GS, et al. Bile acid malabsorption in persistent diarrhoea. J R Coll Physicians Lond 2000;34: Gracie DJ, Kane JS, Mumtaz S, et al. Prevalence of, and predictors of, bile acid malabsorption in outpatients with chronic diarrhea. Neurogastroenterol Motil 2012;24:983 e Muller M, Willen R, Stotzer PO. Colonoscopy and SeHCAT for investigation of chronic diarrhea. Digestion 2004;69: Habba SF. Diarrhea Predominant Irritable Bowel Syndrome (IBS-D): fact or fiction. Med Hypotheses 2011;76: Gunnarsson J, Simren M. Efficient diagnosis of suspected functional bowel disorders. Nat Clin Pract Gastroenterol Hepatol 2008;5: Shin A, Camilleri M, Vijayvargiya P, et al. Bowel functions, fecal unconjugated primary and secondary bile acids, and colonic transit in patients with irritable bowel syndrome. Clin Gastroenterol Hepatol 2013;11: e1. 57 Manabe N, Wong BS, Camilleri M, et al. Lower functional gastrointestinal disorders: evidence of abnormal colonic transit in a 287 patient cohort. Neurogastroenterol Motil 2010;22:293 e Duboc H, Rainteau D, Rajca S, et al. Increase in fecal primary bile acids and dysbiosis in patients with diarrhea-predominant irritable bowel syndrome. Neurogastroenterol Motil 2012;24:513 20, e Wong BS, Camilleri M, Carlson PJ, et al. A Klothobeta variant mediates protein stability and associates with colon transit in irritable bowel syndrome with diarrhea. Gastroenterology 2011;140: Wong BS, Camilleri M. Elobixibat for the treatment of constipation. Expert Opin Investig Drugs 2013;22: Simren M, Bajor A, Gillberg PG, et al. Randomised clinical trial: the ileal bile acid transporter inhibitor A3309 vs. placebo in patients with chronic idiopathic constipation a double-blind study. Aliment Pharmacol Ther 2011;34: Camilleri M, Di Lorenzo C. Brain-gut axis: from basic understanding to treatment of IBS and related disorders. J Pediatr Gastroenterol Nutr 2012;54: Delgado-Aros S, Camilleri M, Garcia MA, et al. High body mass alters colonic sensory-motor function and transit in humans. Am J Physiol Gastrointest Liver Physiol 2008;295:G Zhang JH, Nolan JD, Kennie SL, et al. Potent stimulation of Fibroblast Growth Factor 19 expression in the human ileum by bile acids. Am J Physiol Gastrointest Liver Physiol 2013;304:G Walters JR, Tasleem AM, Omer OS, et al. A new mechanism for bile acid diarrhea: defective feedback inhibition of bile acid biosynthesis. Clin Gastroenterol Hepatol 2009;7: Pattni SS, Brydon WG, Dew T, et al. Fibroblast growth factor 19 in patients with bile acid diarrhoea: a prospective comparison of FGF19 serum assay and SeHCAT retention. Aliment Pharmacol Ther 2013;38: Bajor A, et al. Gut 2015;64: doi: /gutjnl
10 Downloaded from on May 8, Published by group.bmj.com Increased colonic bile acid exposure: a relevant factor for symptoms and treatment in IBS Antal Bajor, Hans Törnblom, Mats Rudling, Kjell-Arne Ung and Magnus Simrén Gut : originally published online April 12, 2014 doi: /gutjnl Updated information and services can be found at: References alerting service These include: This article cites 66 articles, 12 of which you can access for free at: Receive free alerts when new articles cite this article. Sign up in the box at the top right corner of the online article. Notes To request permissions go to: To order reprints go to: To subscribe to BMJ go to:
Increased colonic bile acid exposure: a relevant factor for symptoms and treatment in irritable bowel syndrome (IBS)
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