Abstract
Oxalate is a metabolite promoting the formation of calcium oxalate crystals in urine. Hyperoxaluria is a feature of genetic diseases, known as primary hyperoxaluria, leading to chronic kidney disease. Ethylene glycol poisoning induces the crystallization of calcium oxalate crystals in renal tubules, promoting acute renal failure. Urine oxalate results from glyoxylate transformation to oxalate in the liver, due to lactate dehydrogenase (LDH) activity, especially the LDH-5 isoenzyme. Genetic RNA interference therapy targeting lactate dehydrogenase lowers urine oxalate excretion in murine models. Stiripentol is a drug inhibiting neuronal LDH-5 isoenzyme activity. We hypothesized that stiripentol would also reduce hepatic oxalate production and urine oxalate excretion. In vitro Stiripentol decreases oxalate synthesis by hepatocytes. In vivo, stiripentol decreases urine oxalate excretion in rats and protects kidney tissue and function against ethylene glycol intoxication and hydroxyproline-induced calcium oxalate crystalline nephropathy. The use of stiripentol in clinical practice deserves further clinical studies.
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