Abstract:
:The activation of vascular smooth muscle cells (SMCs) in neointimal hyperplasia involves signaling through receptor tyrosine kinases as well as G protein-coupled receptors. Overexpression of G protein-coupled receptor kinase-2 (GRK2) in SMCs can attenuate mitogenic signaling and proliferation in response to not only several G protein-coupled receptor agonists, but also platelet-derived growth factor (PDGF). To test whether overexpression of GRK2 could inhibit other SMC responses implicated in neointimal hyperplasia, we assessed SMC chemotaxis and mitogenic signaling evoked by PDGF and G(q)-coupled receptor agonists. To test the effects of GRK2 overexpression on neointimal hyperplasia in vivo, we employed a rabbit autologous vein graft model system. GRK2 overexpression reduced PDGF-promoted SMC chemotaxis by 85% (P<0.01), but had no effect on chemotaxis promoted by epidermal growth factor (EGF). Congruently, GRK2 overexpression reduced by approximately 50% (P<0.05) the [(3)H]thymidine incorporation induced by combinations of PDGF and Gq-coupled receptor agonists, but had no effect on that induced by PDGF plus EGF. PDGF-, but not EGF-promoted phosphoinositide 3-kinase activity in SMCs was also inhibited by GRK2 overexpression. In rabbit vein grafts, we achieved GRK2 overexpression in medial SMCs, reduced cell proliferation during the first week after graft implantation, and reduced steady state neointimal thickness by 29% (P<0.01), without affecting medial thickness or potentiating SMC apoptosis. Because of its ability to dampen chemotactic and mitogenic signaling through PDGF and Gq-coupled receptors, GRK2 overexpression in SMCs may be a useful therapeutic approach for neointimal hyperplasia.
journal_name
J Mol Cell Cardioljournal_title
Journal of molecular and cellular cardiologyauthors
Peppel K,Zhang L,Huynh TT,Huang X,Jacobson A,Brian L,Exum ST,Hagen PO,Freedman NJdoi
10.1006/jmcc.2002.2092keywords:
subject
Has Abstractpub_date
2002-10-01 00:00:00pages
1399-1409issue
10eissn
0022-2828issn
1095-8584pii
S0022282802920924journal_volume
34pub_type
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journal_title:Journal of molecular and cellular cardiology
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journal_title:Journal of molecular and cellular cardiology
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journal_title:Journal of molecular and cellular cardiology
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doi:10.1006/jmcc.2002.2105
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pub_type: 杂志文章
doi:10.1016/j.yjmcc.2004.05.018
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journal_title:Journal of molecular and cellular cardiology
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更新日期:2005-12-01 00:00:00
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journal_title:Journal of molecular and cellular cardiology
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doi:10.1006/jmcc.2002.2112
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更新日期:2020-04-17 00:00:00
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journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1006/jmcc.1999.1026
更新日期:1999-10-01 00:00:00
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journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/s0022-2828(86)80009-8
更新日期:1986-09-01 00:00:00
abstract::The correlations between myocardial redox and energy states and atrial natriuretic peptide (ANP) secretion were studied in the perfused rat heart by exposing the hearts to global and low-flow ischemia for varying periods. Atrial and ventricular energy states and immunoreactive ANP in the effluent perfusate were measur...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/0022-2828(92)93155-d
更新日期:1992-02-01 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Journal of molecular and cellular cardiology
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更新日期:2019-02-01 00:00:00
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pub_type: 杂志文章
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journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
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更新日期:2015-02-01 00:00:00
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journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
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更新日期:1996-06-01 00:00:00
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journal_title:Journal of molecular and cellular cardiology
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更新日期:1991-06-01 00:00:00
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journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2013.11.010
更新日期:2014-01-01 00:00:00
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journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2016.03.013
更新日期:2016-05-01 00:00:00