High Level Expression of Prop-1 Gene in Gonadotropic Cell Lines
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概要
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Prop-1 acts as an upstream regulator for the Pit-1 gene to induce development of Pit-1 lineage pituitary cell lines, GH-, PRL-, and TSH-producing cells, in the early stage of pituitary organogenesis. Furthermore, Prop-1 is presumed to be involved in the function of FSH/LH-producing cells, gonadotropes, since the defective Prop-1 gene shows hypogonadism. Recently, we reported evidence that Prop-1 directly regulates expression of the porcine FSH<i>β</i> gene, thus providing a novel advance in understanding the function of Prop-1 in FSH/LH production and hypogonadism. This study was intended to demonstrate the expressions of Prop-1 gene in pituitary tumor-derived cell lines. RT-PCR analyses were conducted of Pit-1, glycoprotein α subunit (αGSU), GnRH receptor, and cyclophilin A (a ubiquitously expressing gene). We observed expression of the Pit-1 gene in αT1-1, TαT1, MtT/S, GH3, and TtT/GF cells, expression of the αGSU gene in αT1-1, αT3-1, L<i>β</i>T2, L<i>β</i>T4, TαT1, and GH3 cells, and expression of GnRH receptor gene in αT3-1, L<i>β</i>T2, L<i>β</i>T4, and GH3 cells, respectively. These expression profiles were in accord with their cell lineages, with only a few exceptions. To accurately measure the expression level of the Prop-1 gene, a quantitative analysis was performed using the real-time PCR method. This analysis demonstrated that the L<i>β</i>T2 and L<i>β</i>T4 gonadotrope cell lines, which express the FSH<i>β</i> gene, express the Prop-1 gene. Taken together with our previous observation that Prop-1 is present in the adult porcine pituitary gonadotropes, Prop-1 might also be involved in development of gonadotropes and hormone production.<br>
著者
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AIKAWA Satoko
Laboratory of Molecular Biology and Gene Regulation, Department of Life Science, School of Agricultu
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Kato Takako
Laboratory For Autoimmune Regulation Research Center For Allergy And Immunology Riken Yokohama Insti
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Kato Yukio
Laboratory Of Molecular Biology And Gene Regulation Department Of Life Science Faculty Of Agricultur
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Ono Tetsuo
Laboratory For Genomic Reprogramming Riken Center For Developmental Biology
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SATO Takanobu
Laboratory of Molecular Biology and Gene Regulation, Department of Life Science, School of Agriculture, Meiji University
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AIKAWA Satoko
Laboratory of Molecular Biology and Gene Regulation, Department of Life Science, School of Agriculture, Meiji University
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KATO Takako
Laboratory of Molecular Biology and Gene Regulation, Department of Life Science, School of Agriculture, Meiji University
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