Binding of insulin and insulin-like growth factor I in bovine chromaffin cells in primary culture.
1. Insulin and insulin-like growth factor I (IGF-I) receptors were studied in bovine chromaffin cells isolated from the medulla by collagenase digestion and kept in primary culture. 2. Specific 125I-labelled insulin binding increased with time in culture with no significant change in the dissociation constant, Kd approximately 0.3 nM. Insulin was nearly 100-fold more potent than IGF-I in displacing 125I-labelled insulin. 3. Affinity crosslinking and SDS gel electrophoresis revealed increased binding of 125I-labelled insulin and 125I-IGF-I with time in culture, the densities of the labelling indicating relatively a much higher expression of IGF-I than insulin receptors in the cells. The apparent molecular weight of both the hormone binding subunits were 135,000, suggesting that the insulin and IGF-I receptors in the adrenal medulla are of the peripheral types. 4. Both receptors thus appeared to be affected by the collagenase treatment but with a subsequent recovery when cells were kept in culture.
Serck-Hanssen
G
G
Department of Physiology, University of Bergen, Norway.
Søvik
O
O
D000313:Adrenal Medulla / Q000166:cytology / Q000378:metabolism*; D000818:Animals; D002417:Cattle; D002478:Cells, Cultured; D004591:Electrophoresis, Polyacrylamide Gel; D007328:Insulin / Q000378:metabolism*; D007334:Insulin-Like Growth Factor I / Q000378:metabolism*; D003012:Microbial Collagenase / Q000378:metabolism; D008970:Molecular Weight; D011485:Protein Binding; D011972:Receptor, Insulin / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000378:metabolism; D017451:Receptors, Somatomedin
D007328:Insulin; D011956:Receptors, Cell Surface; D017451:Receptors, Somatomedin; D007334:Insulin-Like Growth Factor I; D011972:Receptor, Insulin; D003012:Microbial Collagenase