title: Effects of hormones targeting nuclear receptors on transcriptional regulation of the growth hormone gene in the MtT/S rat somatotrope cell line.
abstract: We have examined the effects of nuclear receptor hormones such as glucocorticoid, gonadal steroid hormones, thyroid hormone and retinoids on the transcriptional regulation of the 5'-promoter activity of growth hormone (GH) gene using the MtT/S rat pure somatotrope cell line or MtT/SGL, a subclone of MtT/S in which the rat GH gene 5'-promoter (1.7 Kb)-luciferase fusion gene was stably incorporated. RT-PCR analyses revealed that receptors for all the hormones except androgen receptor were expressed in the cell line. Triiodothyronine (T(3), 10 nM) transiently but significantly stimulated the promoter activity of GH gene, whereas retinoic acids (9-cis and all-trans, both 1 microM) showed sustained stimulation. There were no additive effects among the T(3), all-trans, and9-cis retinoic acids. Synthetic glucocorticoid hormone dexamethasone (100 nM) showed an inhibitory effect but, interestingly, significantly enhanced T(3)-stimulated GH promoter activity during long-term incubation. Among the gonadal steroid hormones tested, estradiol and estriol had significant stimulatory effects, and deletion analysis showed that the estrogen effect was maintained with the shortest construct examined (-150 to +6, +1 denotes the transcription start site). These results suggest that thyroid hormone and retinoids stimulate the transcription of GH gene, probably through a common response element, whereas glucocorticoid has both negative and positive effects on GH expression, depending on the combination with other hormones and the time of exposure. Estrogens also have direct stimulatory effects through the proximal promoter region of GH gene.
authors.affiliation: Department of Clinical Pathophysiology, Nagoya University Graduate School of Medicine and Hospital, Nagoya, Japan. iwasakiy@med.nagoya-u.ac.jp
authors.forename: Yasumasa
authors.initials: Y
authors.lastname: Iwasaki
authors.forename: Minako
authors.initials: M
authors.lastname: Morishita
authors.forename: Masato
authors.initials: M
authors.lastname: Asai
authors.forename: Akiko
authors.initials: A
authors.lastname: Onishi
authors.forename: Masanori
authors.initials: M
authors.lastname: Yoshida
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Oiso
authors.forename: Kinji
authors.initials: K
authors.lastname: Inoue
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D002460:Cell Line; D004958:Estradiol / Q000502:physiology; D004964:Estriol / Q000502:physiology; D005786:Gene Expression Regulation; D005938:Glucocorticoids / Q000502:physiology; D013006:Growth Hormone / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D006728:Hormones / Q000502:physiology*; D010903:Pituitary Gland, Anterior / Q000166:cytology / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000235:genetics / Q000502:physiology; D051381:Rats; D018160:Receptors, Cytoplasmic and Nuclear / Q000378:metabolism*; D018168:Receptors, Retinoic Acid / Q000378:metabolism; D011987:Receptors, Steroid / Q000378:metabolism; D011988:Receptors, Thyroid Hormone / Q000378:metabolism; D012176:Retinoids / Q000502:physiology; D015533:Transcriptional Activation / Q000235:genetics / Q000502:physiology*; D014284:Triiodothyronine / Q000502:physiology
chemical_list: D005938:Glucocorticoids; D006728:Hormones; D018160:Receptors, Cytoplasmic and Nuclear; D018168:Receptors, Retinoic Acid; D011987:Receptors, Steroid; D011988:Receptors, Thyroid Hormone; D012176:Retinoids; D014284:Triiodothyronine; D004958:Estradiol; D013006:Growth Hormone; D004964:Estriol