Journal
MOLECULAR AND CELLULAR ENDOCRINOLOGY
Volume 367, Issue 1-2, Pages 85-97Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.mce.2012.12.021
Keywords
GnRH neurons; Channel subunits; mRNA quantification; LH surge
Categories
Funding
- National Institutes of Health [NS 43330]
- NIH [T32HD007133]
- OHSU Department of Physiology and Pharmacology
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Burst firing of neurons optimizes neurotransmitter release. GnRH neurons exhibit burst firing activity and T-type calcium channels, which are vital for burst firing activity, are regulated by 17 beta-estradiol (E2) in GnRH neurons. To further elucidate ion channel expression and E2 regulation during positive and negative feedback on GnRH neurosecretion, we used single cell RT-PCR and real-time qPCR to quantify channel mRNA expression in GnRH neurons. GFP-GnRH neurons expressed numerous ion channels important for burst firing activity. E2-treatment sufficient to induce an LH surge increased mRNA expression of HCN1 channels, which underlie the pacemaker current, the calcium-permeable Ca(V)1.3, Ca(V)2.2, Ca(V)2.3 channels, and TRPC4 channels, which mediate the kisspeptin excitatory response. E2 also decreased mRNA expression of SK3 channels underlying the medium AHP current. Therefore, E2 exerts fundamental changes in ion channel expression in GnRH neurons, to prime them to respond to incoming stimuli with increased excitability at the time of the surge. (C) 2013 Elsevier Ireland Ltd. All rights reserved.
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