Estrogen and insulin modulation of intracellular insulin-like growth factor binding proteins in human breast cancer cells: possible involvement in lysosomal hydrolases oversecretion.

Abstract:

:Differences in insulin-like growth factor binding proteins (IGFBPs) expressed within estrogen receptor positive (ER+, MCF-7/6) and negative (ER-, MDA-MB-231) human breast cancer cells cultured in chemically defined medium were observed. In the absence of insulin, 17 beta-estradiol affects this expression in ER+ cells by significantly reducing 34 and 28 kDa species. In ER+ cells, insulin appears to minimize the estrogen induced reduction of these 34 and 28 kDa IGFBPs and stimulates a 24 kDa type. We suggest that through its association with a given IGFBP, insulin-like growth factor-II (IGF-II) directs lysosomal enzymes to secretion by its binding to the mannose-6-phosphate/IGF-II receptors present in the Golgi apparatus. Alternatively, the association of IGF-II with another IGFBP would inhibit this binding and lead to its autocrine or intracrine mitogenic action via the IGF-I receptor.

authors

Dubois V,Couissi D,Schonne E,Schneider YJ,Remacle C,Trouet A

doi

10.1006/bbrc.1993.1413

subject

Has Abstract

pub_date

1993-04-15 00:00:00

pages

295-301

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(83)71413-0

journal_volume

192

pub_type

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