Document Detail

Asymmetric metabolism of hypothalamic catecholamines alternates with side of ovulation in a lizard (Anolis carolinensis).
MedLine Citation:
PMID:  1583449     Owner:  NLM     Status:  MEDLINE    
We determined levels of monoamines and their metabolites in 2 hypothalami dissected from the right and left hemibrains of 15 females during the right-left alternating ovulatory cycle of Anolis carolinensis. Tissue contents of the following were measured using HPLC and electrochemical (coulometric) detection: dopamine (DA) and its metabolite 2,4-dihydroxyphenylacetic acid (DOPAC), norepinephrine (NE) and its metabolites 3-methoxy-4-hydroxyphenylglycol (MHPG) and 3,4-dihydroxyphenylglycol (DHPG), and serotonin (5-HT) and its metabolite 5-hydroxyindoleacetic acid (5-HIAA). An asymmetry ratio (AR) was determined by subtracting hypothalamic content (pM/mg) on the larger ovary (LO) side from that on the smaller ovary (SO) side, divided by the sum of the 2 sides (AR = SO - LO/SO+LO). The Ar of MHPG and DHPG both decreased as the largest follicle in the LO grew during the cycle, from greater than 0 (content higher on the SO side) at the beginning of the cycle to less than 0 (content higher on the LO side). The average content of MHPG in the 2 sides significantly increased during the cycle. There were no significant asymmetric changes in hypothalamic DA or DOPAC. The average content of DA increased during the cycle, whereas the content of DOPAC, as well as DOPAC/DA, did not change. The average content of 5-HT increased, and the average metabolite ratio of 5-HIAA/5-HT decreased during the cycle without significant asymmetries. The metabolite ratios of NE and DA, but not 5-HT, were asymmetric on the same side in a given female.(ABSTRACT TRUNCATED AT 250 WORDS)
P H Desan; K H Lopez; H B Austin; R E Jones
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of experimental zoology     Volume:  262     ISSN:  0022-104X     ISO Abbreviation:  J. Exp. Zool.     Publication Date:  1992 Apr 
Date Detail:
Created Date:  1992-06-16     Completed Date:  1992-06-16     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0375365     Medline TA:  J Exp Zool     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  105-12     Citation Subset:  IM    
Department of Environmental, Population and Organismic Biology, University of Colorado, Boulder 80309.
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MeSH Terms
Biogenic Monoamines / metabolism
Catecholamines / metabolism*
Dopamine / metabolism
Hypothalamus / metabolism*
Norepinephrine / metabolism
Ovary / metabolism
Ovulation / physiology*
Regression Analysis
Serotonin / metabolism
Grant Support
1-R01-HD27122-01A1/HD/NICHD NIH HHS
Reg. No./Substance:
0/Biogenic Monoamines; 0/Catecholamines; 50-67-9/Serotonin; 51-41-2/Norepinephrine

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