title: Protective effect of pyruvate upon cultured mesothelial cells exposed to 2 mM hydrogen peroxide.
abstract: Rat peritoneal mesothelial cells in culture have the capability of generating hydrogen peroxide. Exposure of these cells to glucose-enriched, lactated-buffered fluids for peritoneal dialysis significantly increases the production of H(2)O(2). Increased liberation of oxygen radicals also involves the risk of damaging the peritoneal membrane. Pyruvate being a natural oxidant scavenger abundantly present in mammalian cells, we hypothesized that its protective effects facing H(2)O(2) can eventually be of relevance for the mesothelial monolayer of patients on long-term peritoneal dialysis. So far, we designed an experimental study in which rat peritoneal mesothelial cells in culture were exposed to 2 mM H(2)O(2). Cell damage was estimated in terms of decreased capability of the mitochondrial dehydrogenases to reduce MTT. Addition of 2 mM sodium pyruvate to the medium prevented the negative effect of hydrogen peroxide. The MTT/protein values for the control group were 0.00357 +/- 0.00075. The ratio after exposure to 2 mM H(2)O(2) was 0. 00217 +/- 0.00028, whereas that detected in cells incubated in H(2)O(2) plus pyruvate was 0.00325 +/- 0.0082 (p < 0.05). These results indicate that pyruvate protected rat peritoneal mesothelial cells in culture against oxidant injury. These data are one more piece of evidence pointing at pyruvate as a potentially useful buffer for peritoneal dialysis solutions.
authors.affiliation: Department of Nephrology and Hypertension and Research Center for Experimental Nephrology, Ha' Emek Medical Center, Afula, Israel.
authors.forename: A
authors.initials: A
authors.lastname: Shostak
authors.forename: L
authors.initials: L
authors.lastname: Gotloib
authors.forename: R
authors.initials: R
authors.lastname: Kushnier
authors.forename: V
authors.initials: V
authors.lastname: Wajsbrot
mesh_terms: D000818:Animals; D002021:Buffers; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D015314:Dialysis Solutions; D004847:Epithelial Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D016166:Free Radical Scavengers / Q000494:pharmacology; D006861:Hydrogen Peroxide / Q000633:toxicity*; D010530:Peritoneal Dialysis; D010537:Peritoneum / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D011506:Proteins / Q000378:metabolism; D019289:Pyruvic Acid / Q000494:pharmacology*; D051381:Rats; D013778:Tetrazolium Salts / Q000378:metabolism; D013844:Thiazoles / Q000378:metabolism
chemical_list: D002021:Buffers; D015314:Dialysis Solutions; D016166:Free Radical Scavengers; D011506:Proteins; D013778:Tetrazolium Salts; D013844:Thiazoles; D019289:Pyruvic Acid; D006861:Hydrogen Peroxide; C022616:thiazolyl blue