Document Detail

Influence of gender on vasomotor effects of oxidized low-density lipoprotein in porcine coronary arteries.
MedLine Citation:
PMID:  9227533     Owner:  NLM     Status:  MEDLINE    
This study compared 5-hydroxytryptamine (5-HT)-induced contraction and relaxation in coronary arteries from male and female pigs and compared the vasomotor effects of the atherosclerotic lipoprotein, oxidized low-density lipoprotein (LDL), in these tissues. 5-HT-induced contraction and endothelium-dependent relaxation were similar, as was sodium nitroprusside-induced relaxation, in coronary arteries from male and female pigs. These data suggest that there were no gender-related differences in 5-HT-induced contraction or 5-HT-mediated nitric oxide (NO) release from the coronary endothelium. In contrast, oxidized LDL (100 micrograms/ml) enhanced 5-HT-induced contraction to a greater extent in coronary arteries from male versus female pigs. Because oxidized LDL inhibited 5-HT-induced relaxation similarly in arteries from male and female animals, a greater effect of oxidized LDL on agonist-induced NO release in tissues from male pigs cannot explain the greater effect on 5-HT-induced contraction. Oxidized LDL contracted coronary arteries from males with a greater force than arteries from females when measured from baseline tone, suggesting that oxidized LDL inhibited basal NO release to a greater extent in coronary arteries from male pigs compared with females, an effect that may have participated in the greater enhancement of 5-HT-induced contraction that occurred in arteries from male pigs. These gender-related differences in the vasomotor effects of oxidized LDL may play an important role in the lesser incidence of cardiovascular disease in premenopausal females than in males and may provide insight into the cardioprotective effect of estrogen.
D A Cox; M L Cohen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of physiology     Volume:  272     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1997 Jun 
Date Detail:
Created Date:  1997-08-18     Completed Date:  1997-08-18     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H2577-83     Citation Subset:  IM    
Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana 46286, USA.
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MeSH Terms
Arteries / drug effects
Coronary Vessels / drug effects*
Lipoproteins, LDL / pharmacology*
Nitroprusside / pharmacology
Serotonin / pharmacology
Sex Characteristics*
Vasodilator Agents / pharmacology
Vasomotor System / drug effects*
Reg. No./Substance:
0/Lipoproteins, LDL; 0/Vasodilator Agents; 0/oxidized low density lipoprotein; 15078-28-1/Nitroprusside; 50-67-9/Serotonin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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