title: Ochratoxin A-induced mycotoxic porcine nephropathy: alterations in enzyme activity in tubular cells.
abstract: Mycotoxic porcine nephropathy was induced by p.o. administration of crystalline ochratoxin A for periods of 5 days, 3 months and 2 years. Enzyme activities of the renal tissue were studied histochemically. These were NADH-tetrazolium reductase, NADPH-tetrazolium reductase, lactate dehydrogenase, isocitrate dehydrogenase, succinate dehydrogenase, glucose-6-phosphate dehydrogenase, alpha-glycerophosphate dehydrogenase, unspecific acid phosphatase and unspecific alkaline phosphatase. The activity of NADH-tetrazolium reductase and succinate dehydrogenase was reduced in the proximal tubule of all nephrons after 5 days ochratoxin A exposure and remained reduced after 3 months and 2 years exposure. The effect of ochratoxin A on these enzymes would appear to cause the impairment of proximal tubular function and the morphological changes observed in the proximal tubule in ochratoxin A-induced mycotoxic porcine nephropathy. The localization of alterations in enzyme activity corresponds to the localization of ochratoxin A previously demonstrated in the kidney. The activities of NADPH-tetrazolium reductase, lactate dehydrogenase, glucose-6-phosphate dehydrogenase and unspecific alkaline phosphatase were reduced focally corresponding to the areas with focal tubular atrophy and the degree of reduction was roughly parallel to the degree of atrophy.
mesh_terms: D000135:Acid Phosphatase / Q000378:metabolism; D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D005260:Female; D005954:Glucosephosphate Dehydrogenase / Q000378:metabolism; D005993:Glycerolphosphate Dehydrogenase / Q000378:metabolism; D007521:Isocitrate Dehydrogenase / Q000378:metabolism; D007674:Kidney Diseases / Q000139:chemically induced / Q000201:enzymology / Q000473:pathology / Q000662:veterinary*; D007687:Kidney Tubules, Proximal / Q000473:pathology; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D009246:NADH Tetrazolium Reductase / Q000378:metabolism; D009247:NADH, NADPH Oxidoreductases / Q000378:metabolism; D009793:Ochratoxins / Q000633:toxicity*; D013385:Succinate Dehydrogenase / Q000378:metabolism; D013552:Swine; D013553:Swine Diseases / Q000139:chemically induced* / Q000201:enzymology
chemical_list: D009793:Ochratoxins; D005993:Glycerolphosphate Dehydrogenase; D007770:L-Lactate Dehydrogenase; D007521:Isocitrate Dehydrogenase; D005954:Glucosephosphate Dehydrogenase; D013385:Succinate Dehydrogenase; D009246:NADH Tetrazolium Reductase; D009247:NADH, NADPH Oxidoreductases; D000469:Alkaline Phosphatase; D000135:Acid Phosphatase