Angiotensin-induced changes in the apparent size of rat liver angiotensin receptors.

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  • Additional Information
    • Source:
      Publisher: Marcel Dekker Country of Publication: United States NLM ID: 8008358 Publication Model: Print Cited Medium: Print ISSN: 0197-5110 (Print) Linking ISSN: 01975110 NLM ISO Abbreviation: J Recept Res Subsets: MEDLINE
    • Publication Information:
      Publication: New York Ny : Marcel Dekker
      Original Publication: [New York, Dekker]
    • Subject Terms:
      Angiotensin II/*analogs & derivatives ; Angiotensins/*pharmacology ; Liver/*analysis ; Receptors, Angiotensin/*analysis ; Receptors, Cell Surface/*analysis; Animals ; Electrophoresis, Polyacrylamide Gel ; Liver/drug effects ; Liver/metabolism ; Male ; Membranes/analysis ; Membranes/metabolism ; Radioligand Assay ; Rats ; Rats, Inbred Strains ; Receptors, Angiotensin/drug effects ; Receptors, Angiotensin/metabolism
    • Abstract:
      Angiotensin receptors from rat liver were labeled using four different ligands: (Sar1-(3H)Tyr4)-Angiotensin ll ((3H)SarAll); (Sar1-(3H)Tyr4-lle8)-Angiotensin ll ((3H)SarlleAll); (Sar1-(125I) Tyr4-(4'-N3) Phe8)-Angiotensin ll (IN3All); (Sar1-(125I)Tyr4-(4'N3D-Phe)8)-Angiotensin ll (IN3DPheAll). (3H)SarAll and IN3All behaved like agonists and (3H)SarlleAll and IN3DPheAll like antagonists. All four ligands labeled the same population of sites. The azido derivatives allowed covalent labeling of receptors with a high yield (about 40%). Membranes were solubilized by Triton X-100 under experimental conditions which ensured complete solubilization of the liganded receptors in a stable form (less than 40% dissociation after 20 h). The apparent size of liganded angiotensin receptors was determined by gel filtration on Ultrogel ACA-34 columns and by SDS gel electrophoresis (in the case of covalent labeling). The apparent Stokes radius of solubilized angiotensin receptors was different wether the receptor was labeled with an agonist (Stokes radius = 6.2 +/- 0.1 nm (6) after labeling with (3H)SarAll) or with an antagonist (Stokes radii of 5.5 +/- 0.1 (7), and 5.6 +/- 0.1 nm (4) after labeling with (3H)SarlleAll and IN3DPheAll respectively). After covalent labeling with IN3All angiotensin receptors were eluted as a mixture of light and heavy forms. SDS gel electrophoresis revealed only one molecular entity of Mr 64,000. It is concluded that binding of an agonist to liver angiotensin receptors triggers or stabilizes an interaction with another membrane component involved in the coupling of the receptor to its primary effector.
    • Accession Number:
      0 (Angiotensins)
      0 (Receptors, Angiotensin)
      0 (Receptors, Cell Surface)
      11128-99-7 (Angiotensin II)
    • Publication Date:
      Date Created: 19840101 Date Completed: 19850404 Latest Revision: 20191031
    • Publication Date:
      20221213
    • Accession Number:
      10.3109/10799898409042554
    • Accession Number:
      6098656