probiotics in adult gastroenterology
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ROLE OF PROBIOTICS IN ADULT GASTROENTEROLOGY
Dr Ajay BhallaPrincipal Consultant & HOD GastroenterologyFortis Hospital Noida
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PROBIOTICS
“You’ve been fooling around with alternative medicine, haven’t you?”
For life
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HISTORY OF PROBIOTICS
Lactic acid bacteria can render a great service in the fight against intestinal putrefaction’
‘Postpone and ameliorate old age’
The Prolongation of Life (1908)
Elie Metchnikof (1845-1916)
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PROBIOTICS: DEFINITIONS
World Health Organization: “live microorganisms which when
administered in adequate amounts confer a health benefit on the host”
A bacterial strain that: Survives the stomach acid and bile Adheres to intestinal lining Grows and establishes temporary residence in
the intestines Imparts health benefitsR Fuller. Probiotics: The Scientific Basis. London: Chapman and Halls. 1992
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PROBIOTICS Colonization at birth Similar to maternal species Specific organisms vary by age in first
year but become established by 1 year No. of bacteria in gut 10 times the
total no. of body cells. Composition of each individuals
microbiota is so distinctive…..it could be used as an alternative to fingerprints..!
Composition also influenced by age,socio-economic srroundings & use of antibiotics
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THE GUT MICRO BIOTA AND ITS INFLUENCE ON HEALTH
O’Hara A.M. et al. EMBO reports 2006; 7: 688-693.
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DISTRIBUTION OF MICROBES IN THE GUT Present in all parts of the intestinal tract Increase from esophagus to colon
acid production bile motility ileocecal valve
Surface-lumen axis: more anaerobes in the outer mucus
Bacteria are not in direct contact with the mucosa – at least, in healthy subjects
Microbes in Intestinal Health and Disease; A.S. Neish Gastroenterology 2009;136:65-80
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Increasingly recognized as a risk factor for human disease: Infections, Obesity, Diabetes, NEC, IBS, IBD PNAS March 15, 2011 Suppl.
Dysbiosis in the Gut
Disturbance of the balance of the
intestinal microbiota
Stress
Ageing
Diet
Infection
Medication (Antibiotics)
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PROBIOTICS Lactobacillus sp.
reuteri casei ramnosus acidophilus
Streptococcus sp. Bifidobacterium sp.
infantis lactis longum breve bifidum
Sacharomyces boulardii (non-human)
VSL no.3
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DESIRABLE CHARACTERISTICS OF A PROBIOTIC STRAIN
Stable and well-described microbe
Non-toxic, non-pathogenic
Able to survive and multiply in desired location
Able to combat pathogens
Efficacious in promoting specific health claim
Scalable production
Easy to distribute
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Mechanism of Action
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In vitro studies, In vivo animal studies, Human observational/epidemiology studies ,Human experimental studies, Randomized Double Blind Placebo Controlled studies with validated biomarkers
In 2010, there were 1158 articles: in high ranking peer-reviewed journals; increasing DBPCRTs ….
Meta-analyses are usually based on a generic probiotic benefit
Reviews and meta-analyses will include relevant trials with different strains but generic conclusions may not be true for individual strains
Each Probiotic strain to be supported by its own dossier of
scientific evidence…
Scientific Evidence for Probiotics
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Benefits and Application
Preventive and therapeutic modality for
gastrointestinal disorders such as Antibiotic
associated & infectious diarrhoea, IBS, IBD,
Management of NAFLD,MHE & Hepatitis
Immune stimulation
Prevention of allergic disorders
Prevention of chronic inflammatory diseases
Prevention of cancers
Reduction of respiratory diseases
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INFECTIOUS DIARRHOEA – PROBIOTICS AS A TREATMENT ?
Allen et al (2010) Cochrane Systematic ReviewUsed alongside rehydration therapy, probiotics appear to be safe and have clear beneficial effects in shortening the duration and reducing stool frequency in acute infectious diarrhoea.
Wolvers et al (2010) ReviewModerate to significant benefit of many probiotic strains in management of acute watery diarrhoea (RV infections) in children.
• Moderate improvements in acute infections (~1 day ↓ duration diarrhoea)• Significant improvements in watery diarrhoea and viral gastroenteritis• More evident when intervention started early in course of infection
The use of probiotics for acute infectious diarrhoea in children is an accepted therapy in Europe
Recommended by the European Society for Paediatric Gastroenterology, Hepatology and Nutrition & European Society of Paediatric Infectious Diseases Expert Working Group
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Functional Constipation(IBS) – probiotics as a treatment?
Chimielewska et al (2010) Systematic Review
5 RCT’s , N= 377 ( 266 adults , 3 RCT’s and 111 children, 2 RCT’s) Bifidobacterium lactis DN-173 010, Lactobacillus casei Shirota, Escherichia coli Nissle 1917, Lactobacillus casei rhamnosus Lcr 35, Lactobacillus rhamnosus GG
Results Bifidobacterium lactis DN-173 010, Lactobacillus casei Shirota and
Escherichia coli Nissle 1917 are effective in improving defecation frequency and stool consistency in adults.
In children, Lactobacillus casei rhamnosus Lcr 35 shows a beneficial effect.
Lactobacillus rhamnosus GG did not demonstrate any benefit
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Probiotics and Constipation
Rationale Some evidence of - Aberrant microbiota - Antibiotic benefit - Link with methane oxidation Up to 66% of the dry weight of stool is bacteria Microbial production of SCFA and metabolism of bile acids help lower gut pH and stimulate motility - Some metabolic products act as neurotransmitters which affects motility.
•Research•Endpoints: symptom questionnaires-pain, bloating, completeness of evacuation, stool consistency defecation frequency, transit time measurements •Hoveyda & Whorwell et al-improvement in 3D with Bifidobacterium infantis 35624(BMC Gastrointestinal-2009)•Evidence is accumulating for some other strains also
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CONSTIPATION
Krammer HJ Coloproctology 2011, 33: 109-113
Double blind Randomized Placebo Controlled trial (n=24)
Yakult or placebo daily for period of 4 weeks Significant acceleration of the total colonic transit
time from 95.6 h to 76.5 h (p=0.05) in probiotic group; No statistically significant change in the total colonic transit time (before: 95.8 h, after: 87.1 h, p=0.282) in the placebo group
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Probiotics in IBD
Still evolving and contentious..microbiota as cause??
Pouchitis: positive reports (in adults), with a mixture of bacterial strains(VSL3)-85% remission vs 6%(Mimura et al 2004 GUT)Ulcerative Colitis: some positive effects
- maintenance of remission- induction of remission in mild-mod flare ups
Crohn disease:minimal- no benefit
Choice of strain, dosing, and disease activity severity might well account for variable results
Eamonn et al Nutr clin Pract 2012
Conclusion?: more high quality data (RCT’s) are required!
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INFLAMMATORY BOWEL DISEASE
An open label preliminary trial conducted on 10 patients with mildly to moderately active Ulcerative Colitis (UC)
Intervention: LcS (8x1010 CFU/day) in addition to conventional therapy daily for 8 weeks
Significantly better clinical activity index score seen after LcS treatment as compared with pre-treatment and control group
LcS effectively treats UC at least in part through the inhibition of interleukin-6 signalling
Mitsuyama K et al J Clin Biochem Nutr 2008, 43 (Suppl.1):78-81
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MICROBIOTA & DISEASE
Antibiotic associated diarhhoea:Normal microbiota eliminated by antibiotics helps other disease causing bacteria to proliferate(Cl.diff.)
Necrotizing Enteroclotitis in premature infants Small Intestinal bacterial overgrowth Bacterial translocation from Gut flora in - Critically ill - Surgery or Trauma - CLD with SBP
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PROBIOTICS & LIVER DISEASES
NAFLD/OBESITY:Qualitative change in Gut microbiota with more avid extractors of absorbale nutrients…hence more Cal. to host(Iacano et al J Nutr Biochem 2010)
Hepatic Encephalopathy(MHE):As effective as Lactulose in decreasing Blood Ammonia levels (Changing gut pH by SCFA,decreasing Bacterial urease activity & decreasing intestinal permeability to ammonia)-Shukla et al Aliment Pharmacol Ther 2011.
Salmonella induced liver damage prevented by probiotics by decreasing bacterial translocation to liver(Rishi et al FEMS Microbiol Ecol 2009)
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SAFETY/CAUTION
Premature neonates or Immunodef. Infants
Short bowel syndrome-Septicemia Severe acute Pancreatitis-Increased
Mortality ??? Etiology
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CONCLUSIONS
•Role of Probiotics well established in Infective & antibiotic ass. diarrhoea.•+ve Role of Probiotics in Pouchitis & UC but in Crohn’s??•MicrObesity- a new concept about microbial community participating in development of fat deposition,insulin resisitence & NAFLD•Pre/pro/symbiotics improve MHE significantly(almost as good as lactulose) •Biologic effects of probiotics are likely to be strain specific.
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Thank You