A gut health approach to metabolic health.
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1 Medicine, Nursing and Health Sciences A gut health approach to metabolic health. Dr Jane Muir Head of Translational Nutrition Science Department of Gastroenterology, Central Clinical School
2 RAPIDLY CONVERGING AREAS: ut microbiology, nutrition and immunology & pharmacology. -TRP receptors -Pain -Cognitive Impairment - fatigue Inflammatory cells GPR43- receptors -Short chain fatty acids SCFA -Gas - Gut inflammation Cytokines (eg. IL-6) Gut microbiota Inflammation - fatigue 2
3 CHRONIC INFLAMMATION Gastrointestinal Tract- Clinical Problems- Functional gastrointestinal disorders (FGID) incl IBS 15% Colorectal cancer 5% Coeliac disease Inflammatory bowel disease (IBD) (Crohn s disease, ulcerative colitis) 1-2% 0.3 % Presentation title 28th February
4 CHRONIC INFLAMMATION Gastrointestinal Tract- Clinical Problems- Functional gastrointestinal disorders (FGID) incl IBS 15% Colorectal cancer 5% Coeliac disease Inflammatory bowel disease (IBD) (Crohn s disease, ulcerative colitis) 1-2% 0.3 %? DIET Presentation title 28th February
5 Core questions: Can events occurring in the gut impact on systemic events? 1. PAIN- Can we use diet to relieve symptoms (eg. pain) associated with gut disorders/disease? 2. GUT INFLAMMATION: Can events occurring in the gut (inflammation) - impact on other metabolic events? 3. GUT INFLAMMATON: How to treat inflammation in the gut? 4. GUT microflora: Can we use diet to control the type of bacteria that grows in our bowel? Presentation title 28th February
6 PAIN: 1. Can we use diet to relieve gut symptoms? Presentation title 28th February
7 Major symptoms associated with functional bowel disorders ( Irritable bowel syndrome -IBS ) Chronic e.g., >3 months in the year Abdominal pain or discomfort Disturbed bowel habits Abdominal bloating Presentation title 28th February
8 FODMAPs = poorly absorbed short-chain carbohydrates XS Fructose Lactose Fructans GOS Polyols Fructans Lactose Fructose Polyols Fructose Polyols Fructans Fructans Polyols Fructans GOS Fructans Fructose Presentation title 28th February
9 How FODMAPs act in the gut. Large intestine Small intestine water delivery gas production Luminal distension Altered motility Pain, bloating, distension, wind, constipation +/- diarrhoea Presentation title 28th February
10 What are the causes of IBS? GI infection post-infectious IBS Stress &/or how it is handled Altered (disturbed) gut mircroflora. Hypersensitivity of the gut to luminal distension [Enteric Nervous System (ENS)]. Presentation title 28th February
11 luminal distension Normal low intensity stimuli Enteric nervous system Controller of most GI functions - secretion, motility, blood flow, mucosal growth Abnormal "high intensity stimuli Little effect on motility Few conscious messages Alter motility Pain, discomfort, awareness Presentation title 28th February
12 PAIN REDUCTION: Low FODMAP diet acts on luminal distension (less gas, less water motility) Presentation title 28th February
13 PAIN- new pathways and other dietary factors involved with pain Presentation title 28th February
14 TRP receptors (cation channels): Key receptors in pain-sensing capsaicin, thiosulfinates (allicin) Prof Nigel Bunnett, 14
15 Inflammation: 2. Can events occurring in the gut impact on other metabolic events? Presentation title 28th February
16 Gut Inflammation: Systemic Events Cytokines Inflammation -Cognitive Impairment - fatigue Inflammation Cytokines - Inflammation - fatigue 16
17 GUT INFLAMMATION: Inflammatory bowel disease Healthy mucosa Inflammation- Crohn s (CD), Ulcerative colitis (UC) Presentation title 28th February
18 2. Gut Inflammation: Effects on cognitive dysfunction and fatigue. Daniel Van Langenberg, Greg Yelland, Peter Gibson DR van Langenberg, PR Gibson. Systematic Review: Fatigue in inflammatory bowel disease. Aliment Pharm Ther 2010; 32 (2): G Morrison, DR van Langenberg, SJ Gibson, PR Gibson. Chronic pain in inflammatory bowel disease: characteristics and associations in a hospital-based cohort. Inflamm Bowel Dis 2012 [submitted, under review] DR van Langenberg, P Della Gatta, B Hill, S A Warmington, D K Kidgell, PR Gibson, AP Russell. Identification of molecular factors regulating skeletal muscle mass and function in patients with Crohn s disease. Clin Gastro Hepatol 2012 Presentation title 28th February
19 How we measure changes in cognition: The SCIT the Subtle Cognitive Impairment Test Simple computer based cognitive test 7 minute tutorial 5 minutes to administer Designed to detect subtle cognitive impairment Highly reproducible Not subject to practice effect 4 4 Friedman et al, Int J Geriatr Psychiatry 2012 Presentation title 28th February
20 U-Stimulus & Mask 1. Fixation stimulus 2. Test stimuli 3. Mask OR 20 Presentation title 28th February
21 21 Presentation title 28th February
22 22 Presentation title 28th February
23 Outcome measures Error rate at each exposure duration = Number of errors made Number of trials presented Response Time (mean, milliseconds) at each exposure duration 23 Presentation title 28th February
24 SCIT-E (%) Example-How we measure changes in cognition: SCIT (Greg Yelland). Head Tail Exposure duration (ms) 24 Slower response time in Group A Presentation title 28th February
25 Fatigue in Crohn s disease Physical Subjective: weakness, inability to complete/initiate task Cognitive Subjective: difficult concentrating, thinking clearly Affect Subjective decreased motivation, low mood, no energy Objective: measurable decrease in performance with repeat/ prolonged activity Objective: measurable decrease in cognitive function or performance (eg SCIT) Daniel Van Langenberg, Greg Yelland, Peter Gibson Presentation title 28th February
26 Response time (msec) Changes in cognition: The SCIT Crohn s disease vs Controls Daniel Van Langenberg, Peter Gibson and Greg Yelland Head Tail 650 Crohn's Controls Slower response time in Crohn s Exposure duration (msec) subjects across all response times Presentation title 28th February
27 2. Gut Inflammation: Effects on fatigue. Daniel Van Langenberg, Peter Gibson Presentation title 28th February
28 Fatigue in IBD: p<0.01 p<0.01 *FIS = Fatigue Impact Scale Fisk et al, Clin Infect Dis
29 Muscle force and fatigue in CD vs Healthy: Methods: Quadriceps muscle Technician blinded to status of participant 5 minute exercise protocol DR van Langenberg, P Della Gatta, B Hill, S A Warmington, D K Kidgell, PR Gibson, AP Russell. Identification of molecular factors regulating skeletal muscle mass and function in patients with Crohn s disease. Clin Gastro Hepatol 2012 Presentation title 28th February
30 Torque (Nm) above baseline Muscle force and fatigue in CD vs Healthy: 25 NO significant difference in maximal muscle force (strength) between CD and controls* p= ns* Crohn's Controls p= ns* 10 5 p<0.001* Sharper decline in torque in CD = Muscle fatigue in CD p<0.001* compared with controls Number of contractions (time) DR van Langenberg, Clin Gastro Hepatol 2012 * when controlling for confounders: age, gender, BMI, muscle CSA Presentation title 28th February
31 2. Gut inflammation: Muscle fatigue in IBD. Possible causes. In Crohn s patients- Raised pro-inflammatory IL-6 cytokines Lowered lower serum Vitamin D3 Lower serum Mg It is important for inflammation to be controlled as this may have systemic effects for that individual DR van Langenberg, P Della Gatta, B Hill, S A Warmington, D K Kidgell, PR Gibson, AP Russell. Identification of molecular factors regulating skeletal muscle mass and function in patients with Crohn s disease. Clin Gastro Hepatol 2012 Presentation title 28th February
32 3. Gut Inflammation IBD: How to treat inflammation in the gut? Presentation title 28th February
33 Inflammatory diseases: colitis, asthma, and arthritis. butyrate acetate, propionate GPR43 Charles Mackay, Nature Immunology, Jan, p5. 33
34 How do we generate SCFA? -Bacterial metabolism of Dietary Fibre Presentation title 28th February
35 Different fibre types have different effects- in a healthy gut. Presentation title 28th February
36 Dietary fibre utilization and transit time in Healthy and patients with IBD (in remission). Presentation title 28th February
37 Healthy vs IBD: Input-output on usual diet Healthy controls (n=11) Ulcerative colitis in remission (n=11) Fibre intake 27 g/d 16 g/d Fibre utilisation Starch Transit Non-starch polysaccharide James et al ECCO 2012 Presentation title 28th February
38 IBD Patients (in remission): Effect of adding RS (15g)+ wheat bran (12g/d) on whole gut transit time Normal fibre utilisation (~90%) fibre utilisation (~60%) 28th February 2011 Presentation title James et al ECCO
39 3. Can we use diet to control the type of bacteria that grows in our bowel? Yes we have recently shown this. Presentation title 28th February
40 How to change gut microflora What about diet? 40 (taken from: Nature 2012, vol 489/no. 7415)
41 Problem with our low FODMAP dietit reduces the intake of natural dietary prebiotics! Low FODMAP High FODMAP - fructans, GOS, polyols Presentation title 28th February
42 Long-term effects of restricting FODMAP carbohydrates: Emma Halmos (Dietitian and PhD candidate) Presentation title 28th February
43 Potential health benefits of FODMAPs Substrates of bacterial fermentation SCFA Butyrate important for colonic health (antinflammatory & anticarcinogenic) Prebiotics (GOS, fructans) selectively promote growth of good bacteria putative health benefits e.g., Bifidobacteria Butyrate-producing bacteria (F. prausnitzii, C. coccoides) The low FODMAP diet may have an impact on these Presentation title 28th February
44 Potential downside of the Low FODMAP diet Staudacher et al (King s College Group)- With low FODMAP diet showed improved symptoms in IBS patients over 4 weeks. However, lower numbers of bifidobacteria with low FODMAP diet in patients with IBS. (ref. Staudacher et al Journal of Nutrition, 2012;142; ) Halmos et al (Monash University Group) -Showed improvements in symptoms in IBS patients over 3 weeks on the low FODMAP diet. However, on the low FODMAP diet, proportion of good bacteria decreased- Bifidobacteria and Butyrate-producing (F prausnitzii, C. coccoides). (manuscript in preparation) Presentation title 28th February
45 Summary: Gut, diet and systemic events 1. PAIN- Can we use diet to relieve symptoms (eg. pain) associated with gut disorders/disease? - Low FODMAP diet reduces abdominal pain associated with IBS 2. GUT INFLAMMATION: Can events occurring in the gut (inflammation) - impact on other metabolic events? - Cognitive function and muscle fatigue can be reduced with inflammation (via cytokines IL-6) 3. GUT INFLAMMATON: How to treat inflammation in the gut? - SCFA produced by bacteria fermentation of undigested CHO may be important. Butyrate local effects, acetate and propionate systemic effects. 4. GUT microflora: Can we use diet to control the type of bacteria that grows in our bowel? - Bifido bacteria and butyrate-producing may be manipulated by FODMAP (natural prebiotics) intake Presentation title 28th February
46 The Monash team: Peter Gibson, Jaci Barrett, Emma Halmos, Jessica Biesierkierski, CK Yao, Kelly Liels, Debbie King, Vicki Power, Sue Shepherd, Jessie Mills, Nia Rosella, Rosemary Rose, Richard Gearry, Peter Irving, Sally James, Debbie Nathan, Melissa Haines, Evan Newnham, Catherine Croagh, Daniel van Langenberg, Derrick Ong, Shaylyn Mitchell, CSIRO: Dr Tony Bird, Dr Claus Christophersen The funding: NHMRC, ARC, Eva and Les Erdi Foundation, Monash University, Presentation title 28th February
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