Document Detail


Clostridial pathogenicity in experimental necrotising enterocolitis in gnotobiotic quails and protective role of bifidobacteria.
MedLine Citation:
PMID:  9879939     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The pathogenesis of neonatal necrotising enterocolitis (NEC) remains unclear. Gnotobiotic quails fed a lactose diet have been used to investigate the role of clostridial strains originating from faecal specimens of neonates through the intestinal lesions, the changes in microflora balance and the production of bacterial metabolites, i.e., short-chain fatty acids and hydrogen. Bifidobacteria are thought to exert various beneficial effects on host health, including interaction with the colonic microflora. Therefore, it was hypothesised that a protective role could be exercised through bifidobacterial colonisation. A Clostridium butyricum strain (CB 155-3) and a whole faecal flora including three clostridial species (C. butyricum, C. perfringens, C. difficile), each from premature infants suffering from NEC, caused caecal lesions in quails similar to those observed in man, i.e., thickening of the caecal wall with gas cysts, haemorrhagic ulceration and necrotic areas. Conversely, a whole faecal flora including bifidobacteria (identified as Bifidobacterium pseudo-catenulatum) and no clostridia, isolated from a healthy premature infant, was unable to produce NEC-like lesions. When the two clostridial groups were associated with a Bifidobacterium strain (B. infantis-longum, CUETM 89-215, isolated from a healthy infant), bifidobacterial colonisation suppressed all pathological lesions. This study is the first demonstration of a protective role for bifidobacteria against NEC via the inhibition of growth of C. butyricum or the disappearance of C. perfringens. C. difficile was not found to be responsible for the aetiology of the caecal lesions in quails. The main effect of bifidobacteria on lactose fermentation was either a dramatic decrease or a disappearance of butyric acid. The protective role was not associated with changes in H2 production. Therefore, a new step between colonic colonisation and its relevance to NEC is thought to involve the fermentation of unabsorbed lactose into butyric acid at the onset of the disease.
Authors:
M J Butel; N Roland; A Hibert; F Popot; A Favre; A C Tessedre; M Bensaada; A Rimbault; O Szylit
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of medical microbiology     Volume:  47     ISSN:  0022-2615     ISO Abbreviation:  J. Med. Microbiol.     Publication Date:  1998 May 
Date Detail:
Created Date:  1999-01-21     Completed Date:  1999-01-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0224131     Medline TA:  J Med Microbiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  391-9     Citation Subset:  IM    
Affiliation:
Faculté des Sciences Pharmaceutiques et Biologiques, Laboratoire de Microbiologie, Université René Descartes, Paris, France.
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MeSH Terms
Descriptor/Qualifier:
Animals
Bifidobacterium / growth & development,  isolation & purification,  physiology*
Butyric Acid / metabolism
Cecum / microbiology,  pathology
Clostridium / growth & development,  pathogenicity*
Clostridium difficile / growth & development,  pathogenicity
Clostridium perfringens / growth & development,  pathogenicity
Coturnix
Disease Models, Animal
Enterocolitis, Necrotizing / etiology*,  pathology,  prevention & control*
Feces / microbiology
Fermentation
Germ-Free Life*
Humans
Hydrogen / metabolism
Infant
Infant, Newborn
Lactose / metabolism
Virulence
Chemical
Reg. No./Substance:
107-92-6/Butyric Acid; 1333-74-0/Hydrogen; 63-42-3/Lactose

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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