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Diabetes, Vol 29, Issue 12 971-978, Copyright © 1980 by American Diabetes Association

ARTICLES

Insulinopenic diabetes after rodenticide (Vacor) ingestion: a unique model of acquired diabetes in man

JH Karam, PA Lewitt, CW Young, RE Nowlain, BJ Frankel, H Fujiya, ZR Freedman and GM Grodsky

A clinical syndrome, characterized by acute diabetic ketoacidosis associated with a toxic neuropathy, developed in five men who intentionally ingested a recently introduced rodenticide (Vacor) containing N-3-pyridylmethyl-N'-p-nitrophenyl urea (RH-787). A 7-yr-old boy, who accidentally ingested this poison, died within 14 h. Marked insulinopenia, without a reduction in glucagon levels, suggested a specific beta-cytotoxic effect, which was supported after autopsy in three cases by histopathologic evidence of extensive beta cell destruction. Lethal effects in rats prevented investigation of RH-787's diabetogenicity in vivo; however, studies in isolated rat islets confirmed a direct inhibitory effect, which was prevented by concomitant incubation with nicotinamide, suggesting a mechanism of action similar to that of streptozotocin. We detected islet cell-surface antibodies in two of four patients studied. These findings indicate that this nongenetic, acquired form of insulinopenic diabetes, which has persisted in the surviving patients for up to 3 yr, presents a unique opportunity to test in man the concept that hyperglycemia and the accompanying metabolic consequences of insulinopenia can induced diabetic microangiopathy in the absence of genetic predisposition.
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Copyright © 1980 by the American Diabetes Association.