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Insulin-like Growth Factor-Binding protein-2 Inhibits Proliferation of Human Embryonic Kidney Fibroblasts and of IGF-responsive Colon Carcinoma Cell Lines

Insulin-like Growth Factor-Binding protein-2 Inhibits Proliferation of Human Embryonic Kidney Fibroblasts and of IGF-responsive Colon Carcinoma Cell Lines

A Höflich, H Lahm, W Blum, H Kolb, E Wolf

FEBS Lett. 1998 Sep 4;434(3):329-34.

PMID: 9742949

Abstract:

So far, the physiological role of insulin-like growth factor binding protein-2 (IGFBP-2) has not been demonstrated directly. Therefore, we transfected 293 cells with an expression vector containing the CMV promoter and the complete cDNA of mouse IGFBP-2. Secretion of bioactive IGFBP-2 into conditioned medium was demonstrated by Western ligand and Western immunoblotting and quantified by specific RIA. For the analysis of cell proliferation three clones exhibiting either high or low/no IGFBP-2 expression were selected and compared to non-transfected parental 293 cells. IGFBP-2 secreting clones displayed reduced conversion of thiazolyl blue when compared to negative clones or non-transfected parental 293 cells (P < 0.01). The lower growth activity measured in the IGFBP-2 secreting clones was compensated in great part by the administration of exogenous IGF-I or -II. Conditioned media of IGFBP-2 secreting clones inhibited growth of IGF-responsive colon tumor cell lines (LS513, HT-29) while those of negative clones did not. In addition, conditioned medium from a clone expressing high levels of IGFBP-2 inhibited anchorage-independent growth of LS513 and HT-29 cells. In contrast, growth of an IGF-unresponsive tumor cell line (Co-115) was not affected by the conditioned media. We hypothesize that IGFBP-2 might sequester the IGFs and thus prevent them from transferring their mitogenic signals.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR4248607	Insulin-Like Growth Factor Binding Protein-2 from mouse			Price

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