Navolotskaya EV, Vanina VI, Zolotarev YA, Kudryashova NY, Goncharenko EN, Kolobov AA, Kampe-Nemm EA, Yurovsky VV, Lipkin VM. Synthetic peptide immunocortin stimulates the production of 11-oxycorticosteroides by rat adrenal cortex through ACTH receptors.
ACTA ACUST UNITED AC 2004;
119:99-104. [PMID:
15093703 DOI:
10.1016/j.regpep.2004.01.002]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2003] [Revised: 01/15/2004] [Accepted: 01/15/2004] [Indexed: 10/26/2022]
Abstract
Adrenocorticotropic hormone (ACTH)-like peptide immunocortin (IMC) VKKPGSSVKV, corresponding to the amino acid sequence 11-20 of the variable part of human immunoglobulin G (IgG) 1 heavy chain, at concentrations of 10(-9)-10(-6) I was found to increase the adenylate cyclase activity in adrenal cortex membranes, while intramuscular injection of immunocortin at doses of 10-100 microg/kg was found to stimulate the secretion of 11-oxycorticosteroids (CS) from the adrenals to the bloodstream. Immunocortin was labeled with tritium to specific activity of 22 Ci/mmol. Receptor binding studies revealed that [(3)H]immunocortin ([(3)H]IMC) bound with high affinity and specificity to ACTH receptors on rat adrenal cortex membranes (K(d)=2.1+/-0.2 nM, B(max)=1.1+/-0.1 pmol/mg protein).
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