Radioreceptor Assay for growth hormone in coho salmon (Oncorhynchus kisutch) and its application to the study of stunting
Identifieur interne : 001227 ( Istex/Checkpoint ); précédent : 001226; suivant : 001228Radioreceptor Assay for growth hormone in coho salmon (Oncorhynchus kisutch) and its application to the study of stunting
Auteurs : Elisabeth S. Gray [États-Unis] ; Graham Young [États-Unis, Nouvelle-Zélande] ; Howard A. Bern [États-Unis]Source :
- Journal of Experimental Zoology [ 0022-104X ] ; 1990-12.
Abstract
Binding sites for native chum salmon growth hormone (sGH) in coho salmon (Oncorhynchus kisutch) hepatic membranes were analyzed by radioreceptor assay. Displaceable (specific) binding represented up to 25% of total radiolabeled sGH added. Binding was dependent on buffer pH and membrane protein concentration, and was complete by 24 hours at 15°C. Specific binding was greatest in liver membranes, and was also detected in rr.uscle, ovary, gill, kidney, and brain. Scatchard analyses indicated a single class of hepatic binding sites that were specific for sGH. In stunts, abnormal seawater salmon with elevated plasma GEI levels and inhibited growth, specific binding of sGH to liver membranes was three times lower thiin in normal seawater smolts. The concentration of salmon GH binding sites was decreased in stunt livers by 60%, while their affinity for sGH was unchanged. Down‐regulation of hepatic GH receptors by high plasma GH levels may explain in part the low sGH binding in stunts.
Url:
DOI: 10.1002/jez.1402560308
Affiliations:
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ISTEX:33129FA9B73543264FAD114FD20A63E180B64AE0Le document en format XML
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<front><div type="abstract" xml:lang="en">Binding sites for native chum salmon growth hormone (sGH) in coho salmon (Oncorhynchus kisutch) hepatic membranes were analyzed by radioreceptor assay. Displaceable (specific) binding represented up to 25% of total radiolabeled sGH added. Binding was dependent on buffer pH and membrane protein concentration, and was complete by 24 hours at 15°C. Specific binding was greatest in liver membranes, and was also detected in rr.uscle, ovary, gill, kidney, and brain. Scatchard analyses indicated a single class of hepatic binding sites that were specific for sGH. In stunts, abnormal seawater salmon with elevated plasma GEI levels and inhibited growth, specific binding of sGH to liver membranes was three times lower thiin in normal seawater smolts. The concentration of salmon GH binding sites was decreased in stunt livers by 60%, while their affinity for sGH was unchanged. Down‐regulation of hepatic GH receptors by high plasma GH levels may explain in part the low sGH binding in stunts.</div>
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