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  • Title: Gene expression, localization, and pharmacological characterization of endothelin receptors in diabetic rat bladder dome.
    Author: Saito M, Wada Y, Ikeda K, Wang Z, Smith SD, Foster HE, Nishi K, Weiss RM, Latifpour J.
    Journal: Eur J Pharmacol; 2000 Jan 17; 387(3):253-63. PubMed ID: 10650170.
    Abstract:
    As there are significant amounts of functional endothelin receptors in the mammalian urinary tract, we examined the effect of experimental diabetes on the expression of endothelin receptors and their mRNAs in the rat bladder dome. The density of endothelin receptors in the rat bladder dome was higher (8 and 16 weeks following the onset of diabetes) than in age-matched controls. Insulin treatment, started 8 weeks after the induction of diabetes, partially reversed the endothelin receptor alterations. The pharmacological profile of the endothelin receptors in the bladder dome was similar in all groups and was consistent with the predominance of the endothelin ET(A) receptor subtype (ET(A):ET(B)=approximately 4:1). Autoradiographic studies demonstrated that the endothelin receptors were located in all tissue components of the bladder, including epithelial and muscular layers. Semiquantitative reverse transcription-polymerase chain reaction (RT-PCR) data indicated that diabetes increased the expression level of gene transcripts for both endothelin receptor subtypes and that insulin treatment reversed the mRNA upregulation.
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