Shifts in the Intestinal Microbiota

Transcription

1 Shifts in the Intestinal Microbiota Therapeutic Opportunities for Pre- and Probiotics? Kelly A. Tappenden, Ph.D., R.D., FASPEN Kraft Foods Human Nutrition Endowed Professor Editor-in-Chief, Journal of Parenteral and Enteral Nutrition

2 Flint et al. Nat. Rev. 2012;9:

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4 Ackerman, Sci Am, June 2012

5 Functions of the Intestinal Microbiota Functions Protective functions against pathogenic bacteria Mechanisms/Effects Pathogen displacement Nutrient competition Production of antimicrobial factors Activation of local immune response Contribute to the intestinal barrier function Immune development IgA production Control of local and general inflammation Tightening of junctions Induction of tolerance to foods Digestive and metabolic functions Vitamin production Fermentation of nondigestible cho SCFA Dietary carcinogens metabolism Neuronal development Modulation of brain gut axis during neuronal development Motor control and anxiety behavior Buccigrossi et al., Curr Opin Gastroenterol 2013, 29:31 38

6 Contact with microbes begins in utero and proceeds in a stepwise manner during birth and early infancy Rautava et al., Nat Rev Gastro Hepatol 2012:9;

7 Cabrera-Rubio R et al. Am J Clin Nutr 2012;96: Microgenome composition of human milk Composition of milk microgenome over time NW OW NW OW NW OW Col 1M 6M Composition of milk microgenome with route of delivery Vag NonE CS Elec CS

8 Factors affecting stability and complexity of gut microbiome in health and disease Kostic et al., Gastroenterology 2014;146:

9 Consistent taxonomic signature of microbiota maturation across different healthy children living in Bangladesh Subramanian et al., Nature 2014; doi: /nature13421

10 Persistant immaturity of the gut microbiota in children with malnutrition Subramanian et al., Nature 2014; doi: /nature13421

11 Dysbiosis with childhood diseases Disease Celiac Disease IBD IBS NEC Atopy Obesity CF Microbiota composition changes Lack of bacteria of the phylum Bacteroidetes along with an abundance of Firmicutes concs of Faecalibacterium prausnitzii and Bifidobacteria levels of Escherichia coli Reduced diversity of gut microbiota Significantly % of the class Gammaproteobacteria Presence of unusual Ruminococcus-like microbes Predominance of Gammaproteobacteria diversity of gut microbiota counts of Lactobacilli, Bifidobacteria, and Bacteroides counts of Clostridium difficile diversity of gut microbiota Firmicutes a t expenses of the Bacteroidetes group counts of lactic acid bacteria, clostridia, Bifidobacterium spp., Veillonella spp., and Bacteroides-Prevotella spp. Buccigrossi et al., Curr Opin Gastroenterol 2013;29:31 38

12 Dysbiosis in adult disease Acute diarrhea IBD Functional bowel disorders Liver disease Energy regulation GI malignancy C. diff disease Gastroenterology, May 2014

13 What is a Probiotic? Oral probiotics are living microorganisms that upon ingestion in specific numbers, exert health benefits beyond those of inherent basic nutrition Nonpathogenic Resistant to technological processing, storage and delivery Resistant to gastric acidity and lysis by bile Viable in the gastrointestinal environment May adhere to the epithelium Produces antimicrobial substances

14 Old Dancing Russians?? 4vMs8&feature=related

15 A story long in the making First reported intakes being the injection of soured milks by Nomads >2000 years ago >100 years ago, Elli Metchinikoff, known as the pioneer of probiotics, observed complex microbial population of the colon Autointoxication Longevity in Bulgarians linked to consumption of fermented milk containing lactobacillus Abandoned colectomy for probiotic use

16 Strong Evidence Supporting Probiotic Use Clinical Condition Diarrhea Infectious adult treatment Infectious childhood treatment Prevention of antibiotic-associated diarrhea Inflammatory Bowel Disease Pouchitis - Preventing and maintaining remission Organism Saccharomyces boulardii, LGG LGG, Lactobacillus reuteri S. boulardii, LGG, L. casei,. Bulgaricus, S. thermophilus VSL#3 Immune response LGG, L. acidophilus, L. plantarum, B. lactis, L. johnsonii, VSL#3 Atopic eczema associated with cow s milk allergy Treatment LGG, B. lactis

17 Lactobacillus improves clinical outcomes in children with acute infectious diarrhea Meta-analysis with 9 RCTs diarrhea duration diarrhea by 0.7 days frequency by 1.6 episodes on d2 Van Niel et al., Pediatrics 2002;109:

18 Condition Recommendation for Use of Probiotics in Diarrhea in Children Prevention of day-care diarrhea Prevention of nosocomial diarrhea Antibiotic-associated diarrhea Sample Size Probiotics Studied 1700 B. lactis/s.thermophilus LGG 356 LGG B. lactis/s.thermophilus 2000 LGG Saccharomyces boulardii Infectious diarrhea 3000 LGG Saccharomyces boulardii L. acidophilus LB Efficacy Persistent diarrhea 235 LGG / Guandalini S. J Clin Gastro 2008;42(S2):S53-S57.

19 VSL#3 are beneficial for maintaining remission in patients with pouchitis. 23 RCTs (n=1763) comparing probiotics with controls in IBD Probiotics assoc with induction of remission in UC (P<0.01, RR=1.51) VSL#3 (P<0.0001, RR=1.80) VSL#3 reduced the clinical relapse rates for maintaining remission in patients with pouchitis (P< , RR=1.18) Shen et al., Inflamm Bowel Dis 2014;20:21 35

20 VSL#3 induced remission in patients with mild-to-moderately active ulcerative colitis PRCT adult patients (n=147) Placebo vs 3.6x10 12 CFU VSL#3 1 endpoint At w6, 50% improvement in UCDAI obtained in 32% of VSL#3 vs 10% of placebo (P =.001). Sood et al., Clin Gastro Hepatol 2009;7:

21 Probiotics and antibiotic assoc diarrhea Objective Evaluate the evidence for probiotic use in the prevention and treatment of antibiotic-associated diarrhea Source 82 RCTs, 11,811 subjects Probiotic studied - Lactobacillus, Bifidobacterium, Saccharomyces, Steptococcus, Enterococcus and/or Bacillus Results - probiotic administration with reduction in AAD (RR, 0.58; 95% CI, 0.50 to 0.68; P.001) Interpretation - insufficient to determine whether this association varies systematically by population, antibiotic characteristic, or probiotic preparation. Hempel et al., JAMA 2012;307:

22 Moderate Evidence Supporting Probiotic Use Clinical Condition Diarrhea Prevention of infection Treatment of recurrent C. difficile-associated diarrhea Prevention of recurrent C. difficile-associated diarrhea Necrotizing Enterocolitis Irritable Bowel Syndrome Organism Saccharomyces boulardii, LGG S. boulardii, LGG S. boulardii, LGG B. infantis, S. thermophilus, B. bifidus B. infantis

23 Clinical Studies of Beneficial Effects of Probiotics in Neonatal NEC Probiotic (n=72) Control (n=73) P-value # cases NEC 3 (4%) 12 (16.4%) P = 0.03 BW of NEC infants P = 0.85 GA of NEC infants P = 0.52 Age of diagnosis (d) P = 1.00 Bell staging P = NEC-associated mortality 1/3 3/12 P = 0.87 NEC and/or death 6/73 17/72 P = Bin-Nun et al. J Ped 2005;147:

24 Probiotics reduce risk of NEC in preterm neonates <33 weeks systematically review of RCTs evaluating probiotic efficacy and safety in preventing NEC Meta-analysis of 7 RCTs (n=1393) estimated: risk of NEC with probiotics (RR=0.36; 95% CI, ) risk of sepsis did not differ (RR=0.94; CI, risk of death with probiotics (RR=0.47; ) time to full feeds with probiotics (-2.74 days) Short- and long-term safety needs assessment Unanswered questions include dose, duration, and type of probiotic agents Deshpande et al., Lancet 2007;369:

25 NEC Prevention with Probiotics Mihatsch. Curr Opin Clin Nutr Metab Care 2011;14:

26 American Pediatric Surgical Association Clinical Guidelines SUMMARY: Substantial data support routine supplementation of enteral intake with probiotics in premature infants to reduce the incidence of severe NEC (Grade A/B). No formal recommendations regarding the formulation, timing or duration of supplementation could be determined, but at least one probiotic formulation initiated in the first week of life and continued for at least two weeks appears appropriate. Downard et al., J Ped Surg 2012;47:

27 Irritable bowel syndrome symptoms alleviated by B infantis O Mahony et al., Gastroenterology 2005;128:

28 Besselink et al., Lancet 2008; 371: PRObiotics in PAncreatitis TRIAl - PROPATRIA multicenter, double-blind, placebo-controlled RCT (n=298) with predicted severe acute pancreatitis aiming to assess the effects of probiotic prophylaxis primary outcome infectious complications <72h of symptom onset, randomized to receive enteral probiotic or placebo twice daily for 28 days /day Ecologic 641 Lactobacillus acidophilus, Lactobacillus casei, Lactobacillus salivarius, Lactococcus lactis, Bifidobacterium bifidum, and Bifidobacterium lactis probiotic prophylaxis with this combination of probiotic strains did not reduce the risk of infectious complications

29 Probiotic prophylaxis associated with increased risk of mortality in PROPATRIA

30 What is a Prebiotic? A prebiotic is a non-digestible food ingredient that beneficially affects the host by selectively stimulating the growth and/or activity of one of a limited number of bacteria in the colon, and thus improves host health. Gibson and Roberfroid,1995 Gibson et al., 2004

31 Microbiota: breast vs bottle? Breast-fed infants dominated by bifidobacteria ( bifidofactor ) E. coli bacteroides Formula-fed infants more complex microbiota assoc with levels of pathogenic infections Harmsen et al., JPGN 2000;30:61-67

32 What s in human milk? Petherick Nature 2010;65:S5-S7

33 Maternal gut microbes actively transported to mammary gland and secreted in milk providing tolerogenic immune milieu with TGF-B2 to infant. Rautava et al., Nat Rev Gastro Hepatol 2012:9;

34 Breast milk = the natural synbiotic! Prebiotic Probiotic Synbiotic

35 Infants consuming formula with prebiotic microbiota more similar to that of breast fed infants. Oozeer R. Am J Clin Nutr 2013;98(suppl):561S 71S.

36 Fecal [siga] after 8 and 26 wk of prebiotic formula Scholtens et al., JN 2008;138: Subgroup = exclusively formula fed

37 Prebiotic formula reduces cumulative incidence of infections during first 6 months of life *p<0.05 **p<0.01 Arslanoglu et al., J. Nutr. 2007;137:

38 Prebiotic formula reduces episodes of infections and fever during first 2 years of life Arslanoglu et al., J. Nutr. 2008;138:

39 Prebiotic formula reduces incidence of allergic manifestations during first 2 years of life Arslanoglu et al., J. Nutr. 2008;138:

40 Lewis et al. Clin Gastroenterol Hepatol 2005;3(5): Prebiotic reduced recurrence of diarrhea in subjects with CDAD. Objective - to determine if the prebiotic oligofructose could alter the fecal microbiota and, in addition to antibiotic treatment, reduce the rate of relapse from C difficile infection. n=142 patients stool culture confirmed oligofructose as prebiotic relapse of diarrhea more common in those taking placebo (8.3% prebio vs 34.3% placebo, P < 0.001). longer period of time from commencing antibiotic to diarrhea settling (6 vs 3 days; P = 0.007). patients who relapsed stayed in hospital longer than those who did not (53 vs 26 days, P = 0.021)

41 Galacto-oligosaccharide prevents incidence and symptoms of Traveler's Diarrhea Placebo (n=78) B-GOS (n=81) Subjects with diarrhea 30* 19 Diarrhea duration (d) 4.567* ± ± Duration of abdominal pain (d) 3.533* ± ± Duration of vomiting (d) ± ± Duration of fever (d) ± ± Duration of anorexia (d) ± ± Duration of headache (d) ± ± Duration of dizziness (d) ± ± Quality of Life (score/d) ± * ± 5.51 Drakoularakou et al., Eur J Clin Nutr 2010;64:

42 Dietary inulin reduces inflammation associated with pouchitis Randomized, double-blind crossover trial on 20 subjects ileal pouch-anal anastomosis randomized to placebo or 24 g inulin for 3 wks with fecal analysis after each test period Inulin [butyrate], ph, # Bacteroides fragilis, and [secondary bile acids] in feces Placebo Inulin P-value Clinical score 1.26 (0.29) 1.00 (0.27) 0.17 Endoscopic score 1.47 (0.32) 0.95 (0.22) 0.04 Histologic score 2.61 (0.26) 2.11 (0.14) 0.04 Total PDAI score 5.39 (0.62) 4.05 (0.44) 0.01 Welters et al. Dis Colon Rectum 2002;45:

43 Galacto-oligosaccharide stimulated bifidobacteria and alleviated IBS symptoms Subjects with IBS (n=44) completed 12-wk crossover RCT Randomized to 3.5 g GOS, 7 g GOS or 7 g placebo daily and symptoms assessed weekly Prebiotic faecal bifidobacteria (3.5, P<0.005; 7, P<0.001). 3.5 GOS: improved stool consistency (P < 0.05), flatulence (P < 0.05), bloating (P < 0.05), composite score of symptoms (P < 0.05) 7 GOS: improved anxiety scores (P < 0.05) Placebo without effect Silk et al Aliment Pharmacol Ther 2009;29:

44 Probiotics incidence of nosocomial pneumonia in critically ill Liu et al. Critical Care 2012, 16:R109

45 VSL#3 prevented fat diet-induced obesity and diabetes Yadav et al., JBC 2013;288:

46 VSL#3 improves NAFLD in children Alisi et al., Aliment Pharmacol Ther 2014;39:

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48 We need to consider (and feed) this complex ecosystem Probiotic Prebiotic Healthy Microbiome