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Establishment and Characterization of a Simian Virus 40-Transformed Temperature-Sensitive Rat Luteal Cell Line¹

Department of Physiology and Biophysics (N.S., M.Z., R.K.S., C.M.T., S.E.N., M.R., G.G.) University of Illinois at Chicago, Chicago, Illinois 60612-7342; Faulkner Centre for Reproductive Medicine (M.Z., R.K.S.), Boston, Massachusetts 02130; and Heritable Disorders Branch (J.Y.C.), National Institute of Child Health and Human Development, Bethesda, Maryland 20892

Address all correspondence and requests for reprints to: Dr. Geula Gibori, Department of Physiology and Biophysics (M/C 901), University of Illinois at Chicago, 901 South Wolcott Avenue, Chicago, Illinois 60612-7342.

The primary culture of rat luteal cells and their long-term maintenance have been difficult. Low cellular yields have limited the possibility for the study of gene regulation in luteal cells. The goal of this study was to develop a cell line to serve as a model by which to study the expression and regulation of various genes specific to luteal cells. We attempted to develop a luteal cell line by transformation of large luteal cells through infection with a temperature-sensitive simian virus (SV-40 tsA209) mutant that has a temperature-sensitive mutation required for the maintenance of cell transformation. We report here the successful establishment of such a cell line, designated GG-CL cells. Large luteal cells were purified to homogeneity by flow cytometry from corpora lutea of day 14 pregnant rats, cultured for 24 h, and then infected with the SV-40 tsA209 mutant virus. Transformed cells were maintained at the permissive temperature (33 C) until colonies were identified. Several colonies of transformed cells were isolated and passaged. They multiplied at 33 C and formed multilayers. At the nonpermissive temperature (40 C), cells reverted to the normal differentiated phenotype similar to the primary luteal cells in culture. To determine whether GG-CL cells express the genes found in normal luteal cells, messenger RNA (mRNA) expression was examined by either Northern analysis or RT-PCR with primers specific to each mRNA. GG-CL cells were found to express receptors for interleukin-6 and glucocorticoid, as well as the newly discovered estrogen receptor-ß (ER-ß) and the orphan nuclear receptor nur 77. No receptors for ER-, progesterone, LH, or PRL could be detected. This cell line also expressed 20-hydroxysteroid dehydrogenase (20-HSD), but not cholesterol side-chain cleavage cytochrome P450 (P450scc), 3ß-hydroxysteroid dehydrogenase, or aromatase cytochrome P450 (P450arom). Although the cells did not express the PRL receptor, they did express Janus kinase (JAK2) and signal transducers and activators of transcription (Stat5b), and, when transfected with the PRL receptor, they responded to PRL with a marked inhibition in 20-HSD mRNA expression. In addition, estradiol enhanced ER-ß expression in a dose-dependent manner whereas cAMP stimulation caused a marked and rapid increase in the expression of the orphan receptor nur 77. In summary, a temperature-sensitive cell line was successfully established from the large luteal cells of rat corpora lutea. These cells express key genes encoding enzymes and receptors inherent to this defined luteal cell population and respond to stimulation by PRL, estradiol, and cAMP.

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