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- W2342296957 abstract "Background Ion transport in the renal proximal tubule ( RPT ), which is increased in essential hypertension, is regulated by numerous hormones and humoral factors, including insulin and dopamine. Activation of dopamine receptor inhibits sodium reabsorption, whereas activation of insulin receptor increases sodium reabsorption in RPT s, and hyperinsulinemic animals and patients have defective renal dopaminergic system. We presume that there is an inhibition of D 4 receptor on insulin receptor expression and effect, and the regulation is lost in spontaneously hypertensive rats ( SHR s). Methods and Results Insulin receptor expression was determined by immunoblotting, and Na + ‐K + ‐ ATP ase activity was detected in both Wistar‐Kyoto ( WKY ) and SHR RPT cells. Stimulation of D 4 receptor with PD 168077 decreased expression of insulin receptors, which was blocked in the presence of the calcium‐channel blocker, nicardipine (10 −6 mol/L per 24 hours), in cell culture medium without calcium or in the presence of inositol 1,4,5‐trisphosphate ( IP 3) receptor blocker (2‐aminoethyl diphenylborinate [2‐ ADB] ; 10 −6 mol/L per 24 hours), indicating that extracellular calcium entry and calcium release from the endoplasmic reticulum were involved in the signal pathway. Stimulation of the insulin receptor stimulated Na + ‐K + ‐ ATP ase activity, whereas pretreatment with PD 168077 for 24 hours decreased the inhibitory effects of insulin receptor on Na + ‐K + ‐ ATP ase activity in WKY cells. However, in SHR cells, inhibition of D 4 receptor on insulin receptor expression and effect were lost. Conclusions Activation of D 4 receptor inhibits insulin receptor expression in RPT cells from WKY rats. The aberrant inhibition of D 4 receptor on insulin receptor expression and effect might be involved in the pathogenesis of essential hypertension." @default.
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- W2342296957 date "2016-04-03" @default.
- W2342296957 modified "2023-10-18" @default.
- W2342296957 title "Inhibition of D <sub>4</sub> Dopamine Receptors on Insulin Receptor Expression and Effect in Renal Proximal Tubule Cells" @default.
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- W2342296957 doi "https://doi.org/10.1161/jaha.115.002448" @default.
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