Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1972621 | Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology | 2012 | 9 Pages |
Abstract
High concentrations of sodium deoxycholate (NaDOC) produce toxic effects. This study explores the effect of a single high concentration of NaDOC on the intestinal Ca2Â + absorption and the underlying mechanisms. Chicks were divided into two groups: 1) controls and 2) treated with different concentrations of NaDOC in the duodenal loop for variable times. Intestinal Ca2Â + absorption was measured as well as the gene and protein expressions of molecules involved in the Ca2Â + transcellular pathway. NaDOC inhibited the intestinal Ca2Â + absorption, which was concentration dependent. Ca2Â +-ATPase mRNA decreased by the bile salt and the same occurred with the protein expression of Ca2Â +-ATPase, calbindin D28Â k and Na+/Ca2Â + exchanger. NaDOC produced oxidative stress as judged by ROS generation, mitochondrial swelling and glutathione depletion. Furthermore, the antioxidant quercetin blocked the inhibitory effect of NaDOC on the intestinal Ca2Â + absorption. Apoptosis was also triggered by the bile salt, as indicated by the TUNEL staining and the cytochrome c release from the mitochondria. As a compensatory mechanism, enzyme activities of the antioxidant system were all increased. In conclusion, a single high concentration of NaDOC inhibits intestinal Ca2Â + absorption through downregulation of proteins involved in the transcellular pathway, as a consequence of oxidative stress and mitochondria mediated apoptosis.
Keywords
BLMNBTNFkBGSSGNa+/Ca2 + exchangerGAPDHGPXGSHNCX1BBMCATNaDOCPMCA1bESRplasma membrane Ca2 +-ATPaseDAB3,3′-diaminobenzidineBAsO2−superoxide anionBile acidsBrush border membranenitro blue tetrazoliumOxidative stressintestinal calcium absorptionApoptosisGastrointestinalElectron spin resonanceSODSodium deoxycholateSuperoxide dismutaseBasolateral membranenuclear factor kappa BCatalaseCalbindin D28KQuercetinGlutathioneoxidized glutathioneglutathione peroxidaseglyceraldehyde-3-phosphate dehydrogenase
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Authors
MarÃa A. Rivoira, Ana M. Marchionatti, Viviana A. Centeno, Gabriela E. DÃaz de Barboza, MarÃa E. Peralta López, Nori G. Tolosa de Talamoni,