Linked Life Data

8661183

Source:http://linkedlifedata.com/resource/pubmed/id/8661183

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1996-8-8
pubmed:abstractText
The universal response of a blood vessel to intimal injury is the development of intimal hyperplasia. The etiology of this lesion is not fully understood but is assumed to involve stimulation of receptors on smooth muscle cells with their subsequent proliferation. Many receptor-mediated processes are coupled to G-proteins but little information exists regarding the expression of G-proteins during the development of intimal hyperplasia. This study examines the kinetics of G-protein expression in experimental vein grafts. Male New Zealand White rabbits had a right carotid interposition bypass graft using the ipsilateral external jugular vein. These were harvested on days 1, 3, 5, 7, 14, and 28 postoperatively for histology (n = 3), for in vitro isometric tension studies of potassium chloride, serotonin, bradykinin, and histamine (n = 3), or for Western blot analysis (n = 3) of the G-protein subunits (alpha(i1), alpha(i2), alpha(i3), alpha(S) and beta). The results show that expression of alpha(i3) developed de novo, was detectable by day 1, and continued to increase through day 7, paralleling the development of intimal hyperplasia. The expression of alpha(S) (52 kDa) increased significantly by day 1 and also continued to increase until day 7. In contrast, expression for alpha(i2), alpha(S) (45 kDa) and beta subunits increased at a much slower rate from 1 to 7 days and remained constant thereafter. No alpha(i1) was detected. The contractile response to potassium chloride was significantly reduced (36% of the response in the jugular vein) over the first 7 days and increased to 196% of the jugular vein response at 14 and 28 days. There was minimal response to serotonin, bradykinin, and histamine over the first 7 days. Contractile responses to serotonin increased while those to bradykinin and histamine decreased from 7 to 28 days. This study demonstrates that there are specific changes in alpha(i) and alpha(S) subunits within 24 hr of grafting and that increases in all G-proteins occur in a time dependent manner up to 7 days postoperatively. Microscopic development of intimal hyperplasia occurs from days 3 to 5 and increases rapidly between 7 and 14 days. Changes in the expression of G-proteins in the vein grafts, particularly the alpha(i3) subunit, parallel this formation of intimal hyperplasia. These alterations in G-protein expression do not appear to correlate with G-protein-mediated, contractile responses in the vein grafts.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0022-4804
pubmed:author
pubmed:issnType
Print
pubmed:volume
63
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
115-22
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1996
pubmed:articleTitle
The temporal sequence of G-protein expression in intimal hyperplasia.
pubmed:affiliation
Vascular Biology and Atherosclerosis Research Laboratory, Department of Surgery, Duke University Medical Center, Durham, North Carolina 27710, USA.
pubmed:publicationType
Journal Article, In Vitro, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't