Regulation of intracellular signaling cascades by GNRH pulse frequency in the rat pituitary: roles for CaMK II, ERK, and JNK activation.

Biology of Reproduction
Laura L BurgerJohn C Marshall

Abstract

Pulsatile GnRH (GNRH) differentially regulates LH and FSH subunit genes, with faster frequencies favoring Lhb transcription and slower favoring Fshb. Various intracellular pathways mediate the effects of GNRH, including CaMK II (CAMK2), ERK, and JNK. We examined whether activation of these pathways is regulated by GNRH pulse frequency in vivo. GNRH-deficient rats received GNRH pulses (25 ng i.v. every 30 or 240 min for 8 h, vehicle to controls). Pituitaries were collected 5 min after the last pulse, bisected, and one half processed for RNA (to measure beta subunit primary transcripts [PTs]) and the other for protein. Phosphorylated CAMK2 (phospho-CAMK2), ERK (mitogen-activated protein kinase 1/3 [MAPK1/3], also known as p42 ERK2 and p44 ERK1, respectively), and JNK (MAPK8/9, also known as p46 JNK1 and p54 JNK2, respectively) were determined by Western blotting. The 30-min pulses maximally stimulated Lhb PT (8-fold), whereas 240 min was optimal for Fshb PT (3-fold increase). Both GNRH pulse frequencies increased phospho-CAMK2 4-fold. Activation of MAPK1/3 was stimulated by both 30- and 240-min pulses, but phosphorylation of MAPK3 was significantly greater following slower GNRH pulses (240 min: 4-fold, 30 min: 2-fold). MAPK8/9 ac...Continue Reading

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Apr 5, 2007·American Journal of Physiology. Endocrinology and Metabolism·Laura L BurgerJohn C Marshall

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Citations

Jun 17, 2011·Journal of the Royal Society, Interface·Krasimira Tsaneva-AtanasovaCraig A McArdle
Jan 1, 2013·Molecular Endocrinology·Gaddameedi R ReddyDjurdjica Coss
Jul 18, 2009·Endocrine Journal·Rie Tsutsumi, Nicholas J G Webster
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Nov 13, 2013·Proceedings of the National Academy of Sciences of the United States of America·Mayumi SugimotoYoshikazu Sugimoto
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Aug 7, 2010·Molecular and Cellular Endocrinology·S P ArmstrongC A McArdle
Mar 28, 2017·Molecular and Cellular Endocrinology·Djurdjica Coss
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Methods Mentioned

BETA
PCR
electrophoresis

Software Mentioned

TotalLab

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