Linked Life Data

2462919

Source:http://linkedlifedata.com/resource/pubmed/id/2462919

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1989-2-23
pubmed:abstractText
Rabbit myometrium contains postsynaptic alpha-1, alpha-2, and beta-2 adrenoreceptors. The response to endogenous catecholamines depends on the summation of interactions at these receptors and is influenced by the hormonal environment. Estrogen treatment of ovariectomized rabbits increases the alpha adrenergic contractile response whereas progesterone treatment of estrogen primed animals results in a predominance of the beta adrenergic response, which is inhibition of contractions. Of the receptor subtypes, only the alpha-2 receptor concentration is increased at physiological estrogen concentrations. However, alpha-2 receptors have not been shown to be directly involved in myometrial contraction, which appears to be mediated solely by alpha-1 adrenergic interactions. To test whether alpha-2 receptors might indirectly affect contraction by opposing interactions at the beta receptor, we examined the ability of alpha adrenergic stimulation to reduce myometrial cyclic adenosine 3',5'-monophosphate (cAMP) generation. We find that alpha-2 receptors inhibit myometrial ade adenylate cyclase through the guanine nucleotide regulatory protein, Gi. In addition, we find that activation of alpha-1 receptors also reduces cAMP generation. This interaction, which can be demonstrated in the absence but not the presence of the phosphodiesterase inhibitor, 3-isobutyl-1-methylxanthine, does not appear to be mediated through Gi. These findings illustrate the complexity of adrenergic interactions in tissues containing several adrenergic subtypes.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/1-Methyl-3-isobutylxanthine, http://linkedlifedata.com/resource/pubmed/chemical/3',5'-Cyclic-AMP Phosphodiesterases, http://linkedlifedata.com/resource/pubmed/chemical/Adenylate Cyclase, http://linkedlifedata.com/resource/pubmed/chemical/Adenylate Cyclase Toxin, http://linkedlifedata.com/resource/pubmed/chemical/Adrenergic alpha-Agonists, http://linkedlifedata.com/resource/pubmed/chemical/Adrenergic alpha-Antagonists, http://linkedlifedata.com/resource/pubmed/chemical/Cyclic AMP, http://linkedlifedata.com/resource/pubmed/chemical/Epinephrine, http://linkedlifedata.com/resource/pubmed/chemical/Propranolol, http://linkedlifedata.com/resource/pubmed/chemical/Receptors, Adrenergic, alpha, http://linkedlifedata.com/resource/pubmed/chemical/Virulence Factors, Bordetella
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0006-3363
pubmed:author
pubmed:issnType
Print
pubmed:volume
39
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
58-65
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
Alpha adrenergic stimulation reduces cyclic adenosine 3',5'-monophosphate generation in rabbit myometrium by two mechanisms.
pubmed:affiliation
Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco 94143.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't