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Detoxification of H2S by differentiated colonic epithelial cells: implication of the sulfide oxidizing unit and of the cell respiratory capacity.
MedLine Citation:
PMID:  22369066     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Aims. Sulfide is released in the large intestine lumen by the microbiota and is an inhibitor of mitochondrial respiration and a genotoxic agent in colonocytes when present in excess. Deciphering how colonocytes metabolize sulfide is an important issue. Results. In this study, using the human colonic epithelial HT-29 Glc-/+ cells, we found that 50 µM sodium hydrogen sulfide represents the threshold of concentration above which respiration is decreased. The capacity of HT-29 Glc-/+ cells to oxidize lower concentration of sulfide was associated with the expression of transcripts corresponding to the enzymes of the sulfide oxidizing unit (SOU) i.e. sulfide quinone reductase (SQR), dioxygenase ETHE1 and thiosulfate sulfur transferase (TST). Inhibition of cell O2 consumption by sulfide was reverted by zinc but not by calcium and iron. When the cells undergo either spontaneous or butyrate-induced differentiation, their capacity to oxidize sulfide was significantly increased. The expression of the genes corresponding to the enzymes of the SOU were not increased whereas increased cellular maximal respiratory capacity and oxygen consumption by the dioxygenase were both measured. In human biopsies recovered from various parts of the large intestine, the three enzymes of the SOU were expressed. Innovation. SOU and cell respiratory capacity are crucial for sulfide detoxification in colonocytes. Conclusion. Sulfide oxidative capacity in the colonic mucosa is higher in differentiated than in proliferative epithelial cells. The cell respiratory capacity and SOU activity appear to represent major determinants allowing sulfide detoxification in colonic epithelial cells.
Authors:
Sabria Mimoun; Mireille Andriamihaja; Catherine Chaumontet; Calina Atanasiu; Robert Benamouzig; Jean Marc Blouin; Daniel Tomé; Frederic Bouillaud; François Blachier
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-2-27
Journal Detail:
Title:  Antioxidants & redox signaling     Volume:  -     ISSN:  1557-7716     ISO Abbreviation:  -     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-2-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100888899     Medline TA:  Antioxid Redox Signal     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
INRA/AGROPARISTECH, UMR 914 Nutrition Physiology and Ingestive Behavior, Paris, France; mimoun@agroparistech.fr.
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