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- W1595284533 abstract "Characterization and regulation of angiotensin II (AII) receptor binding sites was performed in rat membrane preparations from nonadipose (liver, lung) and adipose (interscapular (ISBAT) and periaortic (PA) brown adipose tissue; epididymal (EF) and retroperitoneal (RPF) white adipose tissue). In membrane preparations from brown and white adipose sources, [125I]AII saturation binding revealed a single, high affinity (Kd range of 0.3 -0.6 nM) binding site with a modest AII receptor density (Bmax range of 17-120 fmol/mg protein) comparable to rat lung (130 fmol/mg protein). White adipose tissue contained a greater number of AII receptor sites than brown adipose tissue. Competition displacement studies demonstrated the AT1 receptor is the only angiotensin receptor subtype localized in adipose tissue, with the rank order for competition of [125I]AII binding in all adipose tissues examined AIII > AII > losartan > angiotensin I (AI) > PD123319. The AT2 specific receptor antagonist, PD123319, was ineffective at displacing [125I]AII binding in all adipose tissues examined. Since components of the renin-angiotensin system are regulated in adipose tissue, we determined if the AII receptor is also regulated in the obese state. AII receptor binding characteristics were determined in liver, lung, ISBAT and EF membrane preparations from adult Zucker obese (fa/fa) and lean (Fa/?) rats. AII receptor density was decreased in liver from obese rats. In contrast, the affinity for [125I]AII binding was not altered in tissues from obese rats. In a separate group of obese and lean rats, regulation of the AII receptor by phenobarbital (PB) was examined. Administration of PB restored AII receptor density in liver from obese rats to levels obtained in lean rats. In summary, these results demonstrate the presence of AT1 receptor sites in brown and white adipose tissue. Moreover, AII receptor density is decreased in tissues from obese rats, with restoration of receptor density by administration of PB. Future studies will determine if PB regulates the AT1 receptor at the level of gene expression." @default.
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- W1595284533 date "1996-01-01" @default.
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- W1595284533 title "Characterization and Regulation of Angiotensin II Receptors in Rat Adipose Tissue" @default.
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- W1595284533 doi "https://doi.org/10.1007/978-1-4899-1376-0_5" @default.
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