Mitogenic responsiveness of caprine mammary epithelial cells to endocrine and cytokine factors.

Abstract:

:Mammary cell mitogenic responsiveness was evaluated with an established nontransformed caprine mammary epithelial cell line (CMEC). As expected, the cells responded to insulin-like growth factor 1 (IGF-1), insulin, and hydrocortisone with an increased number of cells after 3 and 5 d in culture. In combination, insulin and hydrocortisone augmented each other. A proliferation response was also observed for transforming growth factor-alpha (TGF-alpha), and epidermal growth factor (EGF), but not for fibroblast growth factor a (FGFa), FGFb, IGF-2, bovine somatotropin, or prolactin. Comparison of mitogenic potential for these growth factors with cells grown on plastic substratum indicated that hydrocortisone was most potent, followed by TGF-alpha in inducing a proliferative response measured by 3H-thymidine incorporation assay. Hydrocortisone augmented proliferation by 149% and TGF-alpha stimulated proliferation by 126% relative to the media control (p < 0.01). EGF, which binds to the same receptor as TGF-alpha in other species, induced a modest 35% increase in proliferation. Comparison of culture conditions with plastic, fibronectin, and type I collagen suggests that extracellular matrix/stroma influences the magnitude and effective concentration for cytokine-mediated growth response. Studies on responsiveness to ovarian steroids estradiol 17-beta (E2) and progesterone (P4) showed a modest proliferation response to E2 only in combination with triiodio-L-thyronine (T3), and no response to P4 or T3 either alone or in combination when grown on plastic.

journal_name

Endocrine

journal_title

Endocrine

authors

Pantschenko AG,Yang TJ

doi

10.1385/ENDO:10:2:123

subject

Has Abstract

pub_date

1999-04-01 00:00:00

pages

123-30

issue

2

eissn

1355-008X

issn

1559-0100

pii

ENDO:10:2:123

journal_volume

10

pub_type

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