Linked Life Data

15857612

Source:http://linkedlifedata.com/resource/pubmed/id/15857612

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
10
pubmed:dateCreated
2005-4-28
pubmed:abstractText
Stimulation of the RhoA/Rho-kinase (ROK) signaling represents a key step in the maintenance of agonist-induced contraction of smooth muscle. We aimed to demonstrate Ca(2+) sensitization in rat anococcygeus and retractor penis muscles and to identify the molecular expression of major components of this pathway. Both anococcygeus and retractor penis showed a similar expression of RhoA, ROKalpha, and ROKbeta at the protein level as well as the mRNA for RhoGEFs. Cumulative addition of the ROK inhibitors H-1152 (0.001-3 microM), Y-27632 (0.01-30 microM) or HA-1077 (0.01-30 microM) caused sustained relaxations of precontracted smooth muscle strips. Ca(2+) sensitization induced by phenylephrine, norepinephrine and carbachol was markedly antagonized by all three ROK inhibitors. In addition, the contractile response to KCl-induced depolarization was highly sensitive to these ROK inhibitors. H-1152 was approximately 8-20 more potent than Y-27632 and HA-1077 to inhibit contraction. Electrical field stimulation (EFS, 1-32 Hz) caused transient contractions in both anococcygeus and retractor penis muscle, which were blocked by tetrodotoxin (1 microM), phentolamine (1 microM) or bretylium tosylate (30 microM). Similarly, H-1152 (0.1-1 microM), Y-27632 (1-10 microM) or HA-1077 (1-10 microM) significantly reduced EFS-evoked contractions in a concentration-dependent manner. The results indicate that the RhoA/ROK-mediated Ca(2+) sensitization pathway is expressed in anococcygeus and retractor penis muscles and enhances contractions produced by receptor-dependent and independent mechanisms.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0006-2952
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
69
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1483-92
pubmed:dateRevised
2008-9-11
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Ca2+ sensitization and the regulation of contractility in rat anococcygeus and retractor penis muscle.
pubmed:affiliation
Department of Physiology, Medical College of Georgia, Augusta, GA 30912-3000, USA. cteixeira@mail.mcg.edu <cteixeira@mail.mcg.edu>
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural