Neonatal rat islet cell cultures synthesize insulin-like growth factor I.

Abstract:

:Monolayer cultures of islet B-cells were established from neonatal rat pancreas. Serum-free media conditioned by these cultures for 72 h were concentrated and fractionated on Sephadex G-50 at acid pH into a high-molecular-weight pool containing binding protein for insulin-like growth factors (IGFs) and a low-molecular-weight pool containing IGFs. IGF activity in the IGF pool was demonstrated by a specific radioreceptor assay using rat liver plasma membranes and 125I-labeled rat IGF-II. The IGF in islet cell media was characterized further by radioimmunoassays specific for human IGF-I and for rat IGF-II. Islet cell IGF was identified as predominantly IGF-I or a closely related species and not IGF-II. Levels of approximately 15-50 ng IGF-I (based on human IGF-I standard)/10(6) islet cells accumulated in media after 72 h, and presumably represented synthesis by the islet cells. Concentrations of IGF-I attained in culture media, approximately 0.1 ng/ml, were sufficient to stimulate [3H]thymidine incorporation into B-cells. Growth hormone did not consistently increase IGF-I synthesis, suggesting that the previously described effects of growth hormone on islet cell replication do not result from stimulation of IGF-I synthesis by islet cells. Thus, although the IGF-I synthesized by islet cells may be a physiologically relevant growth factor for these cells, the mitogenic effects of growth hormone in islet cells appear to be independent and not mediated by IGF-I.

journal_name

Diabetes

journal_title

Diabetes

authors

Romanus JA,Rabinovitch A,Rechler MM

doi

10.2337/diab.34.7.696

subject

Has Abstract

pub_date

1985-07-01 00:00:00

pages

696-702

issue

7

eissn

0012-1797

issn

1939-327X

journal_volume

34

pub_type

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