{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T11:29:27Z","timestamp":1788866967826,"version":"build-2803163510"},"reference-count":38,"publisher":"Oxford University Press (OUP)","issue":"29","license":[{"start":{"date-parts":[[2023,6,28]],"date-time":"2023-06-28T00:00:00Z","timestamp":1687910400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000050","name":"National Heart, Lung and Blood Institute","doi-asserted-by":"publisher","award":["RO1 HL146583"],"award-info":[{"award-number":["RO1 HL146583"]}],"id":[{"id":"10.13039\/100000050","id-type":"DOI","asserted-by":"publisher"}]},{"name":"America Heart Association Merit Award","award":["NIH T32GM120011"],"award-info":[{"award-number":["NIH T32GM120011"]}]},{"name":"Marfan Foundation McKusick Fellowship Award"},{"DOI":"10.13039\/100000968","name":"American Heart Association","doi-asserted-by":"publisher","award":["20CDA35310689"],"award-info":[{"award-number":["20CDA35310689"]}],"id":[{"id":"10.13039\/100000968","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["S10OD023469"],"award-info":[{"award-number":["S10OD023469"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["S10OD025240"],"award-info":[{"award-number":["S10OD025240"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["P30EY002520"],"award-info":[{"award-number":["P30EY002520"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["RO1DK114356"],"award-info":[{"award-number":["RO1DK114356"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["UM1HG006348"],"award-info":[{"award-number":["UM1HG006348"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,8,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>Aims<\/jats:title>\n                  <jats:p>The variant p.Arg149Cys in ACTA2, which encodes smooth muscle cell (SMC)-specific \u03b1-actin, predisposes to thoracic aortic disease and early onset coronary artery disease in individuals without cardiovascular risk factors. This study investigated how this variant drives increased atherosclerosis.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods and results<\/jats:title>\n                  <jats:p>Apoe\u2212\/\u2212 mice with and without the variant were fed a high-fat diet for 12 weeks, followed by evaluation of atherosclerotic plaque formation and single-cell transcriptomics analysis. SMCs explanted from Acta2R149C\/+ and wildtype (WT) ascending aortas were used to investigate atherosclerosis-associated SMC phenotypic modulation. Hyperlipidemic Acta2R149C\/+Apoe\u2212\/\u2212 mice have a 2.5-fold increase in atherosclerotic plaque burden compared to Apoe\u2212\/\u2212 mice with no differences in serum lipid levels. At the cellular level, misfolding of the R149C \u03b1-actin activates heat shock factor 1, which increases endogenous cholesterol biosynthesis and intracellular cholesterol levels through increased HMG-CoA reductase (HMG-CoAR) expression and activity. The increased cellular cholesterol in Acta2R149C\/+ SMCs induces endoplasmic reticulum stress and activates PERK-ATF4-KLF4 signaling to drive atherosclerosis-associated phenotypic modulation in the absence of exogenous cholesterol, while WT cells require higher levels of exogenous cholesterol to drive phenotypic modulation. Treatment with the HMG-CoAR inhibitor pravastatin successfully reverses the increased atherosclerotic plaque burden in Acta2R149C\/+Apoe\u2212\/\u2212 mice.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusion<\/jats:title>\n                  <jats:p>These data establish a novel mechanism by which a pathogenic missense variant in a smooth muscle-specific contractile protein predisposes to atherosclerosis in individuals without hypercholesterolemia or other risk factors. The results emphasize the role of increased intracellular cholesterol levels in driving SMC phenotypic modulation and atherosclerotic plaque burden.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/eurheartj\/ehad373","type":"journal-article","created":{"date-parts":[[2023,6,28]],"date-time":"2023-06-28T09:24:02Z","timestamp":1687944242000},"page":"2713-2726","source":"Crossref","is-referenced-by-count":42,"title":["Smooth muscle \u03b1-actin missense variant promotes atherosclerosis through modulation of intracellular cholesterol in smooth muscle cells"],"prefix":"10.1093","volume":"44","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6456-8004","authenticated-orcid":false,"given":"Kaveeta","family":"Kaw","sequence":"first","affiliation":[{"name":"Division of Medical Genetics, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston , 6431 Fannin Street, Houston, TX 77030 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9907-213X","authenticated-orcid":false,"given":"Abhijnan","family":"Chattopadhyay","sequence":"additional","affiliation":[{"name":"Division of Medical Genetics, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston , 6431 Fannin Street, Houston, TX 77030 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7288-9369","authenticated-orcid":false,"given":"Pujun","family":"Guan","sequence":"additional","affiliation":[{"name":"Division of Medical Genetics, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston , 6431 Fannin Street, Houston, TX 77030 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiyuan","family":"Chen","sequence":"additional","affiliation":[{"name":"Division of Medical Genetics, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston , 6431 Fannin Street, Houston, TX 77030 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2643-5059","authenticated-orcid":false,"given":"Suravi","family":"Majumder","sequence":"additional","affiliation":[{"name":"Division of Medical Genetics, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston , 6431 Fannin Street, Houston, TX 77030 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xue-yan","family":"Duan","sequence":"additional","affiliation":[{"name":"Division of Medical Genetics, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston , 6431 Fannin Street, Houston, TX 77030 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5790-0291","authenticated-orcid":false,"given":"Shuangtao","family":"Ma","sequence":"additional","affiliation":[{"name":"Division of Medical Genetics, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston , 6431 Fannin Street, Houston, TX 77030 , USA"},{"name":"Department of Medicine, Michigan State University , 1355 Bogue St, B226B Life Sciences, East Lansing, MI 48824 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Zhang","sequence":"additional","affiliation":[{"name":"Division of Cardiothoracic Surgery, Michael E. 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