Impact of acute streptozotocin-induced diabetes on ABC transporter expression in rats

Chemistry & Biodiversity
Gregory J AngerMicheline Piquette-Miller

Abstract

Hepatic ABC efflux transporters control the cellular uptake (in basolateral membranes) and excretion (in apical membranes) of many substrates. Since type-1 diabetes mellitus (T1DM) is associated with altered hepatobiliary excretion of many endogenous and exogenous substances, we examined key hepatic ABC transporters and levels of the endogenous substrate glutathione in rats with acute streptozotocin-induced T1DM. Renal transporters and inflammatory markers were also examined. Abcb1, Abcc1-4, and Abcg2 were measured using qRT-PCR. Glutathione was measured in liver tissue, plasma, and urine. Inflammatory markers, including C-reactive protein (CRP), were measured in plasma via ELISA. In diabetic rats, Abcb1a, Abcc2, and Abcg2 (apical) were decreased, while Abcc4 (basolateral) was increased. Abcb1a and Abcc2 inversely correlated with plasma CRP. Diabetic and control rats exhibited similar hepatic glutathione, but levels in diabetic plasma were lower. When standardized to urinary output, diabetic rats excreted 6.7-fold more glutathione in urine than controls. Renal transporter levels were normal in diabetic rats. Results show apical transporters involved in hepatobiliary excretion are downregulated in T1DM, possibly through an infla...Continue Reading

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