Abstract
Rat adrenal AT 1A and AT 1B receptors from transfected COS-7 cells were labelled with 125I-Angiotensin II, solubilised, and run on isoelectric focusing gels. Receptors from rat tissues were treated similarly. COS-7 cell-expressed AT 1A and AT 1B receptors each produced a single peak of specific radioactivity at pI 6.8. Rat liver and rat ovary tissue preparations gave peaks at pI 6.8 and 6.5, respectively. In contrast, rat adrenal tissue preparations gave four peaks at pI 7.0, 6.8, 6.5, and 6.3. The additional isoforms found in the rat adrenal tissue preparations may represent post-translationally modified or novel receptors.
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