Cell lines of the pituitary gonadotrope lineage derived by targeted oncogenesis in transgenic mice - PubMed (original) (raw)

Cell lines of the pituitary gonadotrope lineage derived by targeted oncogenesis in transgenic mice

J J Windle et al. Mol Endocrinol. 1990 Apr.

Abstract

Study of the molecular and cellular biology of the gonadotropin hormones would be greatly facilitated by the availability of immortalized anterior pituitary gonadotrope cell lines. We directed expression of the simian virus-40 (SV40) T-antigen (Tag) oncogene to specific cells in the anterior pituitary of transgenic mice using the promoter/enhancer region from the human glycoprotein hormone alpha-subunit gene. Transgenic mice carrying this fusion gene developed anterior pituitary tumors. Clonal cell lines established from these tumors express the endogenous mouse alpha-subunit gene and synthesize and secrete alpha-subunit protein. However, they do not express beta-subunit genes. Alpha-subunit mRNA is induced by GnRH in a dose- and time-dependent manner, but is not regulated by TRH. Thus, we have targeted tumorigenesis in transgenic mice to anterior pituitary cells of the gonadotrope lineage to immortalize this specific endocrine cell while maintaining several highly differentiated functions unique to gonadotropes.

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