Abstract

Type 2 diabetes is associated with an increased risk of nephrolithiasis, specifically in the form of uric acid (UA) nephrolithiasis. Diabetic patients who produce uric stones exhibit a low urine pH, the key factor of UA crystallization. Production of such acidic urine appears to result from the insulin-resistant state characteristic of diabetes mellitus. Insulin resistance is also involved in the pathogenesis of primary UA nephrolithiasis observed in overweight subjects with the metabolic syndrome. Therefore, UA nephrolithiasis should be considered a possible manifestation of insulin resistance, as it already is for hyperuricemia. Occurrence of UA stones in a patient, especially if overweight or hypertensive, should prompt a search for components of the metabolic syndrome in order to implement therapeutic intervention aimed at preventing the development of type 2 diabetes and atherosclerotic complications. Reciprocally, diabetologists should be aware of the risk of UA stones in their patients.

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