Abstract:
:Sheep thyroid cells cultured in serum-free medium were used to study the biologic activity, binding, and production of the insulin-like growth factors (IGFs). IGF-I, IGF-II, and insulin stimulated thyroid cell division. Abundant, specific IGF receptors on sheep thyroid cell membranes were identified by binding displacement studies. Maximal specific binding of [125I]-labeled IGF-I and IGF-II to 25 micrograms of membrane protein averaged 21% and 27% respectively. The presence of type I and type II IGF receptors was confirmed by polyacrylamide gel electrophoresis of [125I]IGFs covalently cross-linked to cell membranes. Under reducing conditions, [125I]IGF-I bound to a moiety of approximate Mr = 135,000 and [125I]IGF-II to a moiety of approximate Mr = 260,000. Cross-linking of [125I]IGF-I to medium conditioned by thyroid cells indicated the presence of four IGF binding proteins with apparent Mr = 34,000, 26,000, 19,000 and 14,000. Thyroid cells also secreted IGF-I and II into the medium. IGF synthesis was enhanced consistently by recombinant growth hormone. These data indicate that sheep thyroid cells are a site for IGF action, binding, and production and provide further evidence that IGFs may modulate thyroid gland growth in an autocrine or paracrine manner.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Bachrach LK,Eggo MC,Hintz RL,Burrow GNdoi
10.1016/0006-291x(88)90219-7subject
Has Abstractpub_date
1988-08-15 00:00:00pages
861-7issue
3eissn
0006-291Xissn
1090-2104pii
0006-291X(88)90219-7journal_volume
154pub_type
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