GH binding to liver in young and old female rats: relation to somatomedin-C secretion

Age-related changes in binding of 125I-bovine GH to liver membrane fractions were measured in female Long-Evans rats 2, 6, 12 and 20 months of age. Specific GH binding did not change between 2 and 6 months of age but increased significantly at 12 and 20 months of age. Scatchard analysis showed that...

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Veröffentlicht in:Experimental biology and medicine (Maywood, N.J.) N.J.), 1987-11, Vol.186 (2), p.229-233
Hauptverfasser: TAKAHASHI, S, MEITES, J
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description Age-related changes in binding of 125I-bovine GH to liver membrane fractions were measured in female Long-Evans rats 2, 6, 12 and 20 months of age. Specific GH binding did not change between 2 and 6 months of age but increased significantly at 12 and 20 months of age. Scatchard analysis showed that the plots were curvilinear and consisted of high- and low-affinity binding sites. The age-related increases in binding sites were mainly due to an increase in number of low-affinity binding sites. Serum somatomedin-C (SM-C) levels in 20-month-old rats were about half those in the 6-month-old rats. Twice daily injections of ovine GH (2 mg/kg body wt) for 7 days depressed liver GH binding and increased serum SM-C levels in 19-month-old female rats, but had no effect on GH binding in 2-month-old female rats. These results suggest that the increase in liver GH binding sites and the decrease in SM-C secretion are associated with our previously reported decrease in GH secretion in old female rats.
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Specific GH binding did not change between 2 and 6 months of age but increased significantly at 12 and 20 months of age. Scatchard analysis showed that the plots were curvilinear and consisted of high- and low-affinity binding sites. The age-related increases in binding sites were mainly due to an increase in number of low-affinity binding sites. Serum somatomedin-C (SM-C) levels in 20-month-old rats were about half those in the 6-month-old rats. Twice daily injections of ovine GH (2 mg/kg body wt) for 7 days depressed liver GH binding and increased serum SM-C levels in 19-month-old female rats, but had no effect on GH binding in 2-month-old female rats. 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Psychology</topic><topic>GLANDS</topic><topic>Growth Hormone - metabolism</topic><topic>HORMONES</topic><topic>Insulin-Like Growth Factor I - metabolism</topic><topic>INTERMEDIATE MASS NUCLEI</topic><topic>IODINE 125</topic><topic>IODINE ISOTOPES</topic><topic>ISOTOPE APPLICATIONS</topic><topic>ISOTOPES</topic><topic>KINETICS</topic><topic>LIVER</topic><topic>Liver - metabolism</topic><topic>Liver. Bile. Biliary tracts</topic><topic>MAMMALS</topic><topic>MEMBRANE PROTEINS</topic><topic>MEMBRANES</topic><topic>NUCLEI</topic><topic>ODD-EVEN NUCLEI</topic><topic>ORGANIC COMPOUNDS</topic><topic>ORGANS</topic><topic>PEPTIDE HORMONES</topic><topic>PITUITARY HORMONES</topic><topic>PROTEINS</topic><topic>RADIOISOTOPES</topic><topic>RATS</topic><topic>Rats, Inbred Strains</topic><topic>REACTION KINETICS</topic><topic>RECEPTORS</topic><topic>Receptors, Somatotropin - metabolism</topic><topic>RODENTS</topic><topic>Somatomedins - metabolism</topic><topic>STH</topic><topic>TRACER TECHNIQUES</topic><topic>VERTEBRATES</topic><topic>Vertebrates: digestive system</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>TAKAHASHI, S</creatorcontrib><creatorcontrib>MEITES, J</creatorcontrib><creatorcontrib>Michigan State Univ., East Lansing (USA)</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>OSTI.GOV</collection><jtitle>Experimental biology and medicine (Maywood, N.J.)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>TAKAHASHI, S</au><au>MEITES, J</au><aucorp>Michigan State Univ., East Lansing (USA)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>GH binding to liver in young and old female rats: relation to somatomedin-C secretion</atitle><jtitle>Experimental biology and medicine (Maywood, N.J.)</jtitle><addtitle>Proc Soc Exp Biol Med</addtitle><date>1987-11-01</date><risdate>1987</risdate><volume>186</volume><issue>2</issue><spage>229</spage><epage>233</epage><pages>229-233</pages><issn>0037-9727</issn><issn>1535-3702</issn><eissn>1525-1373</eissn><eissn>1535-3699</eissn><coden>PSEBAA</coden><abstract>Age-related changes in binding of 125I-bovine GH to liver membrane fractions were measured in female Long-Evans rats 2, 6, 12 and 20 months of age. Specific GH binding did not change between 2 and 6 months of age but increased significantly at 12 and 20 months of age. Scatchard analysis showed that the plots were curvilinear and consisted of high- and low-affinity binding sites. The age-related increases in binding sites were mainly due to an increase in number of low-affinity binding sites. Serum somatomedin-C (SM-C) levels in 20-month-old rats were about half those in the 6-month-old rats. Twice daily injections of ovine GH (2 mg/kg body wt) for 7 days depressed liver GH binding and increased serum SM-C levels in 19-month-old female rats, but had no effect on GH binding in 2-month-old female rats. These results suggest that the increase in liver GH binding sites and the decrease in SM-C secretion are associated with our previously reported decrease in GH secretion in old female rats.</abstract><cop>Malden, MA</cop><pub>Blackwell Science</pub><pmid>3671361</pmid><doi>10.3181/00379727-186-42608</doi><tpages>5</tpages></addata></record>
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ispartof Experimental biology and medicine (Maywood, N.J.), 1987-11, Vol.186 (2), p.229-233
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subjects 550201 - Biochemistry- Tracer Techniques
AGE DEPENDENCE
Aging
ANIMALS
BASIC BIOLOGICAL SCIENCES
BETA DECAY RADIOISOTOPES
BIOCHEMICAL REACTION KINETICS
Biological and medical sciences
BODY
CELL CONSTITUENTS
CELL MEMBRANES
DAYS LIVING RADIOISOTOPES
DIGESTIVE SYSTEM
ELECTRON CAPTURE RADIOISOTOPES
Female
Fundamental and applied biological sciences. Psychology
GLANDS
Growth Hormone - metabolism
HORMONES
Insulin-Like Growth Factor I - metabolism
INTERMEDIATE MASS NUCLEI
IODINE 125
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
LIVER
Liver - metabolism
Liver. Bile. Biliary tracts
MAMMALS
MEMBRANE PROTEINS
MEMBRANES
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANS
PEPTIDE HORMONES
PITUITARY HORMONES
PROTEINS
RADIOISOTOPES
RATS
Rats, Inbred Strains
REACTION KINETICS
RECEPTORS
Receptors, Somatotropin - metabolism
RODENTS
Somatomedins - metabolism
STH
TRACER TECHNIQUES
VERTEBRATES
Vertebrates: digestive system
title GH binding to liver in young and old female rats: relation to somatomedin-C secretion
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