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| Research article summary (published 11 Aug 2009): |
Follistatin gene expression by gonadotropin-releasing hormone: a role for cyclic AMP and mitogen-activated protein kinase signaling pathways in clonal gonadotroph LbetaT2 cells.
Full Abstract
The purpose of the present study was to examine the signal transduction pathways involved in follistatin gene expression induced by GnRH in the LbetaT2 cell line. The LHbeta-subunit was predominantly increased by high frequency GnRH pulses (30 min interval); whereas low frequency pulses (120 min) increased FSHbeta. In a static culture, follistatin expression was significantly increased at 12 h (2.35 +/- 0.80-fold) after the addition of GnRH. Following pulsatile stimulation, follistatin mRNA was increased by high frequency GnRH pulses, but not by low frequency pulses. In a static culture, GnRH maximally activated extracellular signal-regulated kinase (ERK) 10 min (3.2 +/- 0.55-fold) after treatment. In addition, intracellular cAMP accumulated up to 2.1 +/- 0.76-fold. Follistatin promoter activity was significantly increased following transfection with either a constitutively active cAMP dependent protein kinase (PKA) or a constitutively active MEK kinase (MEKK). The induction of follistatin gene expression by GnRH was completely inhibited by H89, a protein kinase A inhibitor, and U0126, a MEK inhibitor. Follistatin gene expression was also activated by both PACAP and CPT-cAMP under static culture conditions. Maximal ERK activation levels were nearly identical regardless of GnRH pulse frequency; however, high frequency GnRH pulses elevated both the intracellular cAMP level as well as cAMP-response element (Cre) promoter activity. These results suggest that both the PKA and ERK pathways are necessary for the induction of the follistatin promoter. Furthermore, the intracellular cAMP level, but not ERK activity, determined whether follistatin was induced following high frequency GnRH pulses.
Author information
Author/s: Mutiara, Sandra (S); Kanasaki, Haruhiko (H); Oride, Aki (A); Purwana, Indri N (IN); Shimasaki, Shunichi (S); Yamamoto, Hideyuki (H); Miyazaki, Kohji (K);
Affiliation: Department of Obstetrics and Gynecology, Shimane University, School of Medicine, Izumo City, Shimane Prefecture, Japan.
Journal and publication information
Publication Type: Journal Article
Journal: Molecular and cellular endocrinology (Mol Cell Endocrinol), published in Ireland. (Language: eng)
Reference: 2009-Aug; vol 307 (issue 1-2) : pp 125-32
Dates: Created 2009/06/16; Completed 2009/08/28;
PMID: 19533841, status: MEDLINE (last retrieved date: 8/28/2009)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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MeSH headings (categories)
This article was linked to the MeSH Headings (categories) shown below.
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Associated Chemicals: Follicle Stimulating Hormone, beta Subunit (0) ; Follistatin (0) ; Luteinizing Hormone, beta Subunit (0) ; Pituitary Adenylate Cyclase-Activating Polypeptide (0) ; Protein Kinase Inhibitors (0) ; Thionucleotides (0) ; Gonadotropin-Releasing Hormone (33515-09-2) ; 8-((4-chlorophenyl)thio)cyclic-3',5'-AMP (41941-66-6) ; Cyclic AMP (60-92-4) ; Extracellular Signal-Regulated MAP Kinases (EC 2.7.1.37) ; MAP Kinase Kinase Kinases (EC 2.7.1.37) ; Cyclic AMP-Dependent Protein Kinases (EC 2.7.11.11)Related articles
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