Proliferation of cultured human prostate cancer cells is inhibited by insulin-like growth factor (IGF) binding protein-1: evidence for an IGF-II autocrine growth loop.
J Clin Endocrinol Metab
; 80(12): 3476-82, 1995 Dec.
Article
em En
| MEDLINE
| ID: mdl-8530586
ABSTRACT
In this study, we examined the expression of insulin-like growth factor (IGF) ligands, receptors, (IGFR1, IGFR2), and binding proteins (IGFBPs) in the human prostate cancer cell line DU145, as well as its mitogenic response to the IGFs. Using RNase protection assays, we found expression of IGF-II, IGFR1, and IGFR2 but failed to detect IGF-I messenger RNA. Distinct binding protein species as well as immunoreactive IGF-II were detected in conditioned media using radioligand and immunoblotting assays. Compared with controls, treatment with exogenous IGF-I and IGF-II resulted in stimulation of monolayer and anchorage-independent growth. Recombinant human IGFBP-1, which binds IGF-II with high affinity, inhibited IGF-II-induced monolayer growth and both baseline and IGF-II-induced anchorage-independent growth in this cell line. Our data suggest IGF-II is as an autocrine growth factor in DU145 cells, and that inhibition of IGF-II-dependent growth of human prostate cancer cells may represent a new therapeutic strategy for this disease.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias da Próstata
/
Fator de Crescimento Insulin-Like II
/
Proteína 1 de Ligação a Fator de Crescimento Semelhante à Insulina
Limite:
Female
/
Humans
/
Male
Idioma:
En
Revista:
J Clin Endocrinol Metab
Ano de publicação:
1995
Tipo de documento:
Article
País de afiliação:
Estados Unidos