Rasd1 is an estrogen-responsive immediate early gene and modulates expression of late genes in rat anterior pituitary cells
| Autor: | Linghong Wang, Jun Arita, Tetsuo Mitsui, Maho Ishida, Michi Izawa |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
medicine.medical_specialty Gene knockdown Endocrinology Diabetes and Metabolism Biology Molecular biology Prolactin cell 03 medical and health sciences 030104 developmental biology Endocrinology medicine.anatomical_structure Anterior pituitary Internal medicine Gene expression medicine Signal transduction Estrogen receptor alpha Immediate early gene Estrogen receptor beta |
| Zdroj: | Endocrine Journal. 64:1063-1071 |
| ISSN: | 1348-4540 0918-8959 |
| DOI: | 10.1507/endocrj.ej17-0148 |
| Popis: | Dexamethasone-induced Ras-related protein 1 (Rasd1) is a member of the Ras superfamily of monomeric G proteins that have a regulatory function in signal transduction. Here we investigated the role of Rasd1 in regulating estrogen-induced gene expression in primary cultures of rat anterior pituitary cells. Rasd1 mRNA expression in anterior pituitary cells decreased after treatment with forskolin or serum and increased after treatment with 17β-estradiol (E2). Increases in Rasd1 mRNA expression occurred as early as 0.5 h after E2 treatment, peaked at 1 h and were sustained for as long as 96 h. This rapid and profound increase in Rasd1 mRNA expression induced by E2 was also seen in GH4C1 cells, an estrogen receptor-positive somatolactotroph cell line. Among pituitary estrogen-responsive late genes studied, basal mRNA expression of Pim3 and Igf1 genes was decreased by RNA interference-mediated knockdown of Rasd1 expression, whereas basal expression of the Giot1 gene was increased. Moreover, Rasd1 knockdown enhanced stimulation of Pim3 mRNA expression and attenuated inhibition of Fosl1 mRNA expression 24 h after E2 treatment. These changes in mRNA expression were accompanied by enhanced activity of promoters containing CRE, AP-1 and SRE binding sequences. These results suggest that Rasd1 is an estrogen-responsive immediate early gene and modulates E2 induction of at least several late genes in anterior pituitary cells. |
| Databáze: | OpenAIRE |
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