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Production of insulin-like growth factors, platelet-derived growth factor, and transforming growth factors and their role in the density-dependent growth regulation of a differentiated embryonal carcinoma cell line.

Abstract：

:P19 EPI-7, a differentiated murine embryonal carcinoma cell line with an epithelioid morphology, does not require external growth factors for proliferation under clonal and subconfluent conditions. At saturation density, however, cells become quiescent in the G1/G0 phase of the cell cycle from which they can be restimulated, particularly upon addition of epidermal growth factor. Medium conditioned by confluent P19 EPI-7 cultures is able to enhance clonal outgrowth of this cell line, suggesting that autocrine growth factor loops may be acting in these cells. Analysis of conditioned serum-free medium shows that this cell line produces a platelet-derived growth factor-like growth factor, next to a type beta transforming growth factor and large amounts of insulin-like growth factor II (IGF-II) and an IGF-binding protein with high specificity for IGF-II. This latter observation has been confirmed by the use of a specific bioassay for IGFs, based on their ability to specifically stimulate proliferation of MCF-7 human breast cancer cells. The amount of IGF-II produced (0.5 mg/liter conditioned medium) makes P19 EPI-7 one of the best producing cell lines for this factor described so far. Receptor cross-linking analysis shows that this cell line contains IGF-I receptors, but no specific receptors for IGF-II. Depending on the conditions tested, transforming growth factor-beta 1 either act as a growth-stimulating factor or as a strong growth inhibitory factor. These data demonstrate that upon cellular differentiation, embryonal carcinoma cells can be formed which produce polypeptide growth factors and are also able to respond to such factors. These observations are discussed in the light of the role of autocrine and paracrine growth stimulation processes during early murine development.

journal_name

Endocrinology

journal_title

Endocrinology

authors

van Zoelen EJ,Koornneef I,Holthuis JC,Ward-van Oostwaard TM,Feijen A,de Poorter TL,Mummery CL,van Buul-Offers SC

doi

10.1210/endo-124-4-2029

subject

Has Abstract

pub_date

1989-04-01 00:00:00

pages

2029-41

issue

eissn

0013-7227

issn

1945-7170

journal_volume

124

pub_type

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Production of insulin-like growth factors, platelet-derived growth factor, and transforming growth factors and their role in the density-dependent growth regulation of a differentiated embryonal carcinoma cell line.