An HDAC9-MALAT1-BRG1 complex mediates smooth muscle dysfunction in thoracic aortic aneurysm

Christian L. Lino Cardenas, Chase W. Kessinger, Yisha Cheng, Carolyn MacDonald, Thomas MacGillivray, Brian Ghoshhajra, Luai Huleihel, Saifar Nuri, Ashish S. Yeri, Farouc A. Jaffer, Naftali Kaminski, Patrick Ellinor, Neal L. Weintraub, Rajeev Malhotra, Eric M. Isselbacher and Mark E. Lindsay ()
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Christian L. Lino Cardenas: Thoracic Aortic Center, Massachusetts General Hospital, Harvard Medical School
Chase W. Kessinger: Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School
Yisha Cheng: Thoracic Aortic Center, Massachusetts General Hospital, Harvard Medical School
Carolyn MacDonald: Thoracic Aortic Center, Massachusetts General Hospital, Harvard Medical School
Thomas MacGillivray: Thoracic Aortic Center, Massachusetts General Hospital, Harvard Medical School
Brian Ghoshhajra: Thoracic Aortic Center, Massachusetts General Hospital, Harvard Medical School
Luai Huleihel: McGowan Institute for Regenerative Medicine and Department of Surgery, University of Pittsburgh
Saifar Nuri: Thoracic Aortic Center, Massachusetts General Hospital, Harvard Medical School
Ashish S. Yeri: Cardiology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School
Farouc A. Jaffer: Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School
Naftali Kaminski: Yale University
Patrick Ellinor: Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School
Neal L. Weintraub: Augusta University/Medical College of Georgia
Rajeev Malhotra: Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School
Eric M. Isselbacher: Thoracic Aortic Center, Massachusetts General Hospital, Harvard Medical School
Mark E. Lindsay: Thoracic Aortic Center, Massachusetts General Hospital, Harvard Medical School

Nature Communications, 2018, vol. 9, issue 1, 1-14

Abstract: Abstract Thoracic aortic aneurysm (TAA) has been associated with mutations affecting members of the TGF-β signaling pathway, or components and regulators of the vascular smooth muscle cell (VSMC) actomyosin cytoskeleton. Although both clinical groups present similar phenotypes, the existence of potential common mechanisms of pathogenesis remain obscure. Here we show that mutations affecting TGF-β signaling and VSMC cytoskeleton both lead to the formation of a ternary complex comprising the histone deacetylase HDAC9, the chromatin-remodeling enzyme BRG1, and the long noncoding RNA MALAT1. The HDAC9–MALAT1–BRG1 complex binds chromatin and represses contractile protein gene expression in association with gain of histone H3-lysine 27 trimethylation modifications. Disruption of Malat1 or Hdac9 restores contractile protein expression, improves aortic mural architecture, and inhibits experimental aneurysm growth. Thus, we highlight a shared epigenetic pathway responsible for VSMC dysfunction in both forms of TAA, with potential therapeutic implication for other known HDAC9-associated vascular diseases.

Date: 2018
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DOI: 10.1038/s41467-018-03394-7

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