Insulin-like growth factors in sheep thyroid cells: action, receptors and production.

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.

authors

Bachrach LK,Eggo MC,Hintz RL,Burrow GN

doi

10.1016/0006-291x(88)90219-7

subject

Has Abstract

pub_date

1988-08-15 00:00:00

pages

861-7

issue

3

eissn

0006-291X

issn

1090-2104

pii

0006-291X(88)90219-7

journal_volume

154

pub_type

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