Document Detail

Mechanism underlying prolongevity induced by bifidobacteria in Caenorhabditis elegans.
MedLine Citation:
PMID:  23291976     Owner:  NLM     Status:  Publisher    
Lactobacilli and bifidobacteria are probiotic bacteria that modify host defense systems and have the ability to extend the lifespan of the nematode Caenorhabditis elegans. Here, we attempted to elucidate the mechanism by which bifidobacteria prolong the lifespan of C. elegans. When the nematode was fed Bifidobacterium infantis (BI) mixed at various ratios with the standard food bacterium Escherichia coli strain OP50 (OP), the mean lifespan of worms was extended in a dose-dependent manner. Worms fed BI displayed higher locomotion and produced more offspring than control worms. The growth curves of nematodes were similar regardless of the amount of BI mixed with OP, suggesting that BI did not induce prolongevity effects through caloric restriction. Notably, feeding worms the cell wall fraction of BI alone was sufficient to promote prolongevity. The accumulation of protein carbonyls and lipofuscin, a biochemical marker of aging, was also lower in worms fed BI; however, the worms displayed similar susceptibility to heat, hydrogen peroxide, and paraquat, an inducer of free radicals, as the control worms. As a result of BI feeding, loss-of-function mutants of daf-16, jnk-1, aak-2, tol-1, and tir-1 exhibited a longer lifespan than OP-fed control worms, but BI failed to extend the lifespan of pmk-1, skn-1, and vhp-1 mutants. As skn-1 induces phase 2 detoxification enzymes, our findings suggest that cell wall components of bifidobacteria increase the average lifespan of C. elegans via activation of skn-1, regulated by the p38 MAPK pathway, but not by general activation of the host defense system via DAF-16.
Tomomi Komura; Takanori Ikeda; Chikako Yasui; Shigeru Saeki; Yoshikazu Nishikawa
Related Documents :
24841506 - Structural carbohydrates in a plant biomass: correlations between the detergent fiber a...
22958216 - Vitamin d attenuates high fat diet-induced hepatic steatosis in rats by modulating lipi...
23174676 - Antioxidant effect of apolipoprotein a-i on high-fat diet-induced non-alcoholic fatty l...
24612796 - Genetic parameter estimation for major milk fatty acids in alpine and saanen primiparou...
15049956 - Unchanged fasting and postprandial adiponectin levels following a 4-day caloric restric...
11893616 - Effects of litter size on sympathetic activity in young adult rats.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-6
Journal Detail:
Title:  Biogerontology     Volume:  -     ISSN:  1389-5729     ISO Abbreviation:  Biogerontology     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100930043     Medline TA:  Biogerontology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Food and Human Health Sciences, Graduate School of Human Life Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

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

Previous Document:  Loss of trefoil factor 1 is regulated by DNA methylation and is an independent predictive factor for...
Next Document:  Sesamin extends the mean lifespan of fruit flies.