Document Detail

Electrophysiologic correlates of steroid modulation of luteinizing hormone release.
MedLine Citation:
PMID:  7065175     Owner:  NLM     Status:  MEDLINE    
In both ovariectomized (OVX) and steroid-primed OVX freely moving rats, attempts were made to correlate the effects of intraventricular norepinephrine (NE) on multiunit activity (MUA) of different brain regions with NE-induced alterations in blood LH levels. MUA-recording electrodes were implanted in the diagonal band of Broca (DBB), medial preoptic area (MPOA), arcuate nucleus (ARC) and/or ventromedial hypothalamic nucleus (VMH). Steroid priming included 50 micrograms estradiol benzoate (EB) and 25 mg progesterone (P) 3 days prior to experiment. The unanesthetized animals were bled via indwelling atrial cannulas before and after intraventricular infusion of NE (10 micrograms in 2 microliters over 2 min). In OVX-primed rats NE lengthened the interval between episodic LH peaks and decreased mean blood LH levels. In contrast, in OVX-EBP-primed rats, NE stimulated an LH surge. Concurrent recording of MUA revealed that, in OVX-unprimed rats, NE dramatically depressed MUA in both DBB-MPO and ARC-VMH neurons. However, in OVX-EBP-primed rats, while still markedly inhibiting ARC-VMH units, NE failed to depress MUA recorded in DBB-MPO sites (some units were actually excited by NE), perhaps reflecting the higher ratio of LHRH neurons/inhibitory neurons in DBB-MPO.
P C Leung; D I Whitmoyer; C H Sawyer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  242     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1982 Mar 
Date Detail:
Created Date:  1982-05-27     Completed Date:  1982-05-27     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  E164-70     Citation Subset:  IM    
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MeSH Terms
Action Potentials
Electrodes, Implanted
Frontal Lobe / physiology*
Hypothalamus / physiology*
Hypothalamus, Middle / physiology*
Injections, Intraventricular
Luteinizing Hormone / blood,  secretion*
Norepinephrine / pharmacology*
Grant Support
Reg. No./Substance:
51-41-2/Norepinephrine; 9002-67-9/Luteinizing Hormone

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