Effect of insulin-like growth factor-type I (IGF-I) and insulin on the secretion of sex hormone binding globulin and IGF-I binding protein (IBP-I) by human hepatoma cells.
Dietary factors are known to modulate concentrations of sex hormone-binding globulin (SHBG). In the present study we have investigated the possibility that insulin like growth factor-type I (IGF-I) may be an additional regulator of SHBG using cultured human hepatoma cells which secrete SHBG. The inhibitory effect of insulin on SHBG secretion by these cells was confirmed but, in addition, IGF-I was shown to inhibit SHBG secretion by about 40% at a concentration of 100 nmol/l. A similar degree of inhibition was achieved using insulin at a concentration of 10 mumol/l. Insulin, but not IGF-I, was also found to inhibit the secretion of a low molecular weight IGF-binding protein (IBP-I), which is also secreted by hepatoma cells. It is concluded that IGF-I is an additional regulator of SHBG secretion by these cells and that it may be involved in regulating SHBG secretion in vivo in response to dietary factors.
Singh
A
A
Department of Chemical Pathology, St Mary's Hospital Medical School, Imperial College of Science Technology and Medicine, University of London.
Hamilton-Fairley
D
D
Koistinen
R
R
Seppälä
M
M
James
V H
VH
Franks
S
S
Reed
M J
MJ
D006528:Carcinoma, Hepatocellular / Q000378:metabolism* / Q000473:pathology; D002352:Carrier Proteins / Q000378:metabolism*; D006801:Humans; D007328:Insulin / Q000494:pharmacology*; D018969:Insulin-Like Growth Factor Binding Proteins; D007334:Insulin-Like Growth Factor I / Q000494:pharmacology*; D008113:Liver Neoplasms / Q000378:metabolism* / Q000473:pathology; D012738:Sex Hormone-Binding Globulin / Q000378:metabolism*; D013002:Somatomedins / Q000494:pharmacology*; D014407:Tumor Cells, Cultured / Q000187:drug effects
D002352:Carrier Proteins; D007328:Insulin; D018969:Insulin-Like Growth Factor Binding Proteins; D012738:Sex Hormone-Binding Globulin; D013002:Somatomedins; D007334:Insulin-Like Growth Factor I