Document Detail

Catechol concentrations in the hemolymph of the scallop, Placopecten magellanicus.
MedLine Citation:
PMID:  10753566     Owner:  NLM     Status:  MEDLINE    
Catecholamines have previously been detected in numerous tissues and are thought to control a wide variety of physiological functions in bivalve molluscs. In the present study, alumina extraction and high-performance liquid chromatography reveal the presence of significant concentrations of 3,4-dihydroxyphenylalanine (DOPA), dopamine, and 3,4-dihydroxyphenylacetic acid (DOPAC) in the hemolymph of the sea scallop, Placopecten magellanicus. The concentration of dopamine in the hemolymph averaged 223.8 ng/ml, (+/-48.4, SEM), equivalent to 10(-7) to 10(-6) M. Neither epinephrine nor norepinephrine was reliably detected in significant quantities. Previous studies have demonstrated physiological responses to dopamine with thresholds of 10(-9) to 10(-6) M, thus suggesting that this catecholamine may have an endocrine function. Furthermore, monitoring hemolymph concentrations of catechols might provide a sensitive measure of the physiological status of bivalves. For example, drugs known to affect catechol concentrations in other tissues also effect hemolymph levels. Administration of monoamine oxidase inhibitors such as pargyline, deprenyl, and clorgyline at 10(-4) M for 1 day of incubation followed by a 2-day wash resulted in decreased hemolymph concentrations of DOPAC and increased concentrations of its precursors, DOPA and dopamine. Incubation in 10(-4) M 3,5-dinitrocatechol, a catecholamine-O-methyl transferase blocker, for 1 day followed by a 2-day wash significantly increased the concentration of dopamine and DOPAC in the hemolymph. Scallops incubated in 10(-5) M alpha-methyl-p-tyrosine, a blocker of tyrosine hydroxylase, for 1 day followed by a 3-day wash in artificial seawater had significantly reduced concentrations of DOPA, dopamine, and DOPAC in the hemolymph. In addition to responding to pharmacological agents, dopamine levels also decreased significantly following thermal induction of spawning, thus suggesting that hemolymph concentrations of catechols might provide indices of reproductive activity and/or stress.
A K Pani; R P Croll
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  General and comparative endocrinology     Volume:  118     ISSN:  0016-6480     ISO Abbreviation:  Gen. Comp. Endocrinol.     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2000-08-02     Completed Date:  2000-08-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370735     Medline TA:  Gen Comp Endocrinol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  48-56     Citation Subset:  IM    
Copyright Information:
Copyright 2000 Academic Press.
Department of Physiology and Biophysics, Dalhousie University, Halifax, Nova Scotia, B3H 4H7, Canada.
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MeSH Terms
3,4-Dihydroxyphenylacetic Acid / metabolism
Catechol O-Methyltransferase / antagonists & inhibitors
Catecholamines / metabolism*
Chromatography, High Pressure Liquid
Clorgyline / pharmacology
Dihydroxyphenylalanine / metabolism
Dopamine / metabolism
Hemolymph / drug effects,  enzymology,  metabolism*
Mollusca / metabolism*
Monoamine Oxidase Inhibitors / pharmacology
Pargyline / pharmacology
Selegiline / pharmacology
Sexual Behavior, Animal / physiology
Reg. No./Substance:
0/Catecholamines; 0/Monoamine Oxidase Inhibitors; 102-32-9/3,4-Dihydroxyphenylacetic Acid; 14611-51-9/Selegiline; 17780-72-2/Clorgyline; 555-57-7/Pargyline; 63-84-3/Dihydroxyphenylalanine; EC O-Methyltransferase

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