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dc.contributor.authorWang, Julie
dc.contributor.authorUryga, Anna K
dc.contributor.authorReinhold, Johannes
dc.contributor.authorFigg, Nichola
dc.contributor.authorBaker, Lauren
dc.contributor.authorFinigan, Alison
dc.contributor.authorGray, Kelly
dc.contributor.authorKumar, Sheetal
dc.contributor.authorClarke, Murray
dc.contributor.authorBennett, Martin
dc.date.accessioned2018-05-04T09:36:43Z
dc.date.available2018-05-04T09:36:43Z
dc.date.issued2015-11-17
dc.identifier.issn0009-7322
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/275555
dc.description.abstractBACKGROUND: Although vascular smooth muscle cell (VSMC) proliferation is implicated in atherogenesis, VSMCs in advanced plaques and cultured from plaques show evidence of VSMC senescence and DNA damage. In particular, plaque VSMCs show shortening of telomeres, which can directly induce senescence. Senescence can have multiple effects on plaque development and morphology; however, the consequences of VSMC senescence or the mechanisms underlying VSMC senescence in atherosclerosis are mostly unknown. METHODS AND RESULTS: We examined the expression of proteins that protect telomeres in VSMCs derived from human plaques and normal vessels. Plaque VSMCs showed reduced expression and telomere binding of telomeric repeat-binding factor-2 (TRF2), associated with increased DNA damage. TRF2 expression was regulated by p53-dependent degradation of the TRF2 protein. To examine the functional consequences of loss of TRF2, we expressed TRF2 or a TRF2 functional mutant (T188A) as either gain- or loss-of-function studies in vitro and in apolipoprotein E(-/-) mice. TRF2 overexpression bypassed senescence, reduced DNA damage, and accelerated DNA repair, whereas TRF2(188A) showed opposite effects. Transgenic mice expressing VSMC-specific TRF2(T188A) showed increased atherosclerosis and necrotic core formation in vivo, whereas VSMC-specific TRF2 increased the relative fibrous cap and decreased necrotic core areas. TRF2 protected against atherosclerosis independent of secretion of senescence-associated cytokines. CONCLUSIONS: We conclude that plaque VSMC senescence in atherosclerosis is associated with loss of TRF2. VSMC senes cence promotes both atherosclerosis and features of plaque vulnerability, identifying prevention of senescence as a potential target for intervention.
dc.format.mediumPrint-Electronic
dc.languageeng
dc.publisherOvid Technologies (Wolters Kluwer Health)
dc.subjectMuscle, Smooth, Vascular
dc.subjectCells, Cultured
dc.subjectMyocytes, Smooth Muscle
dc.subjectAnimals
dc.subjectMice, Transgenic
dc.subjectHumans
dc.subjectMice
dc.subjectFemale
dc.subjectMale
dc.subjectAtherosclerosis
dc.subjectPlaque, Atherosclerotic
dc.subjectCellular Senescence
dc.titleVascular Smooth Muscle Cell Senescence Promotes Atherosclerosis and Features of Plaque Vulnerability.
dc.typeArticle
prism.endingPage1919
prism.issueIdentifier20
prism.publicationDate2015
prism.publicationNameCirculation
prism.startingPage1909
prism.volume132
dc.identifier.doi10.17863/CAM.22794
dcterms.dateAccepted2015-09-17
rioxxterms.versionofrecord10.1161/CIRCULATIONAHA.115.016457
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2015-11
dc.contributor.orcidClarke, Murray [0000-0002-8215-8885]
dc.contributor.orcidBennett, Martin [0000-0002-2565-1825]
dc.identifier.eissn1524-4539
rioxxterms.typeJournal Article/Review
pubs.funder-project-idBritish Heart Foundation (None)
pubs.funder-project-idBritish Heart Foundation (None)
pubs.funder-project-idBritish Heart Foundation (None)
pubs.funder-project-idMedical Research Council (G1000847)
pubs.funder-project-idMedical Research Council (G0800784)
pubs.funder-project-idBritish Heart Foundation (None)
pubs.funder-project-idBritish Heart Foundation (None)
cam.issuedOnline2015-09-28
rioxxterms.freetoread.startdate2016-09-28


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