Abstract
Diabetes mellitus induces a decrease in Na/K ATPase activity in man and animals, and this decrease plays a role in the development of diabetic neuropathy. Na/K ATPase is encoded by various genes, of which the ATP1 A1 gene is expressed predominantly in peripheral nerves and in erythrocytes. To investigate whether a polymorphism in the Na/K ATPase genes could explain the predisposition of some patients with insulin-dependent diabetes mellitus (IDDM) to develop polyneuropathy, a restriction fragment length polymorphism (RFLP) of the ATP1 A1 gene was studied together with erythrocyte Na/K ATPase activity in 81 Caucasian patients with more than 10 years' duration of IDDM. Associations with diabetic neuropathy, retinopathy and nephropathy were sought. Digestion of the first intron of the ATP1 A1 gene by the Bgl II restriction enzyme revealed a dimorphic allelism. Frequency of the restricted allele was 0.18 in this selected series (however, it was 0.10 in representative samples of IDDM patients and of normal subjects in our area). Mean erythrocyte Na/K ATPase activity was lower in diabetic patients than in 42 control subjects (292 +/- 10, vs 402 +/- 13 nmol Pi.mg protein-1.h-1, p < 0.0001) and was not related to HbA1c value or to diab...Continue Reading
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