Insulin-like growth factor-I: specific binding to high and low affinity sites and mitogenic action throughout the life span of WI-38 cells.

Abstract:

:Insulin-like growth factor-I (IGF-I) (13 nM) can replace insulin (0.8 microM) in a serum-free medium containing epidermal growth factor (EGF) (16 nM) and dexamethasone (DEX) (140 nM) and stimulate DNA synthesis in young cultures of WI-38 cells, similar to the stimulation of serum-supplemented medium. By contrast, senescent cells become unresponsive to all of these hormones. The effect of IGF-I, EGF, and DEX is synergistic in stimulating multiple rounds of low density cell division. Total specific binding of [125]IGF-I per cell in monolayer culture does not change with age, which indicates, in light of increased cell size with age, an actual decrease in specific binding per micron2 of cell surface area. Binding can be traced to two separate cell proteins. Binding to the alpha subunit of the IGF-I transmembrane receptor may increase slightly with age while the 50% displacement remains unchanged. The remainder of the IGF-I specific binding (five- to thirty-fold more) is to a low molecular weight, cell-associated binding protein whose 50% displacement is 10 times higher, but also remains unchanged with age. Specific binding to the lower affinity sites decreases slightly with age at equal cell densities. IGF-I binding to the alpha subunit of the transmembrane receptor is independent of cell density, while binding to the low molecular weight binding protein is inversely proportional to cell density and may vary by as much as tenfold.

journal_name

J Cell Physiol

authors

Phillips PD,Pignolo RJ,Cristofalo VJ

doi

10.1002/jcp.1041330117

subject

Has Abstract

pub_date

1987-10-01 00:00:00

pages

135-43

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

133

pub_type

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