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PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1975-10-10
pubmed:abstractText
It has been generally assumed that reactivity (or responsiveness) of mammalian microcirculatory blood vessels to vasoactive hormones is not influenced by sex. In view of the paucity of knowledge in this area, the present in vivo studies were initiated to determine the quantitative dose-response relationships (by means of a high magnification image-splitting television microscope recording system) of catecholamines, selected sympathomimetics, neurohypophyseal hormones (NHPH), serotonin and angiotensin on mesenteric arterioles of unpretreated male and female rats and male rats pretreated with single low doses of 17 beta-estradiol (2 and 10 mug/100 g s.c.). The results indicate: 1) dose-response curves for the constrictor catecholamines (epinephrine and norepinephrine) and NHPH (vasopressin, oxytocin, vasotocin) in female rats are significantly shifted in parallel manner to the left of those obtained in male rats; 2) pretreatment of male rats with estrogen results in an enhancement of the constrictor actions of catecholamines, NHPH and phenylephrine; 3) the maximal arteriolar contractile responses (i.e., lumen narrowings) to norepinephrine and phenylphrine were enhanced by pretreatment with estrogen; and 4) dose-response curves for arteriolar constrictions induced by dopamine, serotonin or angiotensin were not affected by sex or estrogen pretreatment. The sex-linked differences, observed in this study, thus appear to be specific for NHPH and certain alpha adrenergic agonists. Overall, these findings reinforce the concept that sex hormones may play a role in control of peripheral blood flow and reactivity of arteriolar smooth muscle.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0022-3565
pubmed:author
pubmed:issnType
Print
pubmed:volume
193
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
403-12
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed-meshheading:1142098-Angiotensin II, pubmed-meshheading:1142098-Animals, pubmed-meshheading:1142098-Catecholamines, pubmed-meshheading:1142098-Dopamine, pubmed-meshheading:1142098-Epinephrine, pubmed-meshheading:1142098-Estrogens, pubmed-meshheading:1142098-Female, pubmed-meshheading:1142098-Lypressin, pubmed-meshheading:1142098-Male, pubmed-meshheading:1142098-Mesenteric Arteries, pubmed-meshheading:1142098-Muscle Contraction, pubmed-meshheading:1142098-Norepinephrine, pubmed-meshheading:1142098-Oxytocin, pubmed-meshheading:1142098-Phenylephrine, pubmed-meshheading:1142098-Photomicrography, pubmed-meshheading:1142098-Pituitary Hormones, Posterior, pubmed-meshheading:1142098-Rats, pubmed-meshheading:1142098-Serotonin, pubmed-meshheading:1142098-Sex Factors, pubmed-meshheading:1142098-Television, pubmed-meshheading:1142098-Vasotocin
pubmed:year
1975
pubmed:articleTitle
Sex and estrogens and responsiveness of terminal arterioles to neurohypophyseal hormones and catecholamines.
pubmed:publicationType
Journal Article, In Vitro, Research Support, U.S. Gov't, P.H.S.