Inhibitory action of estradiol on growth promoting activity in extract from uterine cancers.

Abstract:

:Extracts from uterine cervical and body cancers, but not from benign tumor or intact tissues tested, were found to contain a growth-promoting activity which induced the proliferation of human endometrial fibroblasts. Exposure of cultured fibroblasts to the cancer extracts increased the rate of [3H]thymidine incorporation in a dose-dependent manner. The activity was heat-labile, and not inactivated by removal of lipid-soluble material suggesting that the activity is associated with a protein. When the fibroblasts were preincubated with estradiol for 12 hours, but not for 1 hour, the extract-induced fibroblast proliferation was suppressed. The inhibitory effect of estradiol was dose related (EC50: 10nM) and non-competitive, suggesting that the steroid may reduce the sensitivity of fibroblasts to the extracts. This is the first report to provide direct evidence that estradiol may play an inhibitory role in the action of growth factor-like peptide produced from malignant tumors.

journal_name

Biosci Rep

journal_title

Bioscience reports

authors

Imai A,Matsunami K,Iida K,Tamaya T

doi

10.1007/BF01116850

subject

Has Abstract

pub_date

1990-02-01 00:00:00

pages

47-53

issue

1

eissn

0144-8463

issn

1573-4935

journal_volume

10

pub_type

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