Cultured mammary carcinoma cells contain gonadotropin‐releasing hormone‐like immunoreactivity, gnrh binding sites and chorionic gonadotropin

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Abstract
Immunoperoxidase staining and radioimmunoassay were used to identify gonadotropin‐releasing hormone (GnRH) and chorionic gonadotropin (hCG) in 4 mammary carcinoma cell lines. GnRH‐like immunoreactivity was found in all cell lines; 2 lines also contained hCG. Binding of a GnRH agonist was demonstrated by radioreceptor assay in cultured mammary carcinoma cells. In cell column perfusion of the same cells, exogenous GnRH did not stimulate release of hCG.

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