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Title: Wnt Signaling Pathway Inhibitor Sclerostin Inhibits Angiotensin II–Induced Aortic Aneurysm and Atherosclerosis

Journal Article · · Arteriosclerosis, Thrombosis, and Vascular Biology
 [1];  [2];  [1];  [1];  [1];  [1];  [3];  [1];  [4];  [5];  [1];  [6];  [7]
  1. James Cook Univ., Townsville, QLD (Australia)
  2. James Cook Univ., Townsville, QLD (Australia); Univ. of Western Sydney, NSW (Australia)
  3. James Cook Univ., Townsville, QLD (Australia); Federation Univ., Ballarat, VIC (Australia)
  4. Leiden Univ. (Netherlands)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. Univ. of Melbourne (Australia)
  7. James Cook Univ., Townsville, QLD (Australia); Townsville Hospital, Townsville, QLD (Australia)

Objective— Sclerostin (SOST) has been identified as a critical regulator of bone formation; however, it has not been previously implicated in arterial disease. The goal of this study was to assess the role of SOST in aortic aneurysm (AA) and atherosclerosis using human samples, a mouse model, and in vitro investigations. Approach and Results— SOST protein was downregulated in human and mouse AA samples compared with controls. Transgenic introduction of human SOST in apolipoprotein E–deficient (ApoE–/–) mice (SOSTTg.ApoE–/–) and administration of recombinant mouse Sost inhibited angiotensin II–induced AA and atherosclerosis. Serum concentrations of several proinflammatory cytokines were significantly reduced in SOSTTg.ApoE–/– mice. Compared with controls, the aortas of mice receiving recombinant mouse Sost and SOSTTg.ApoE–/– mice showed reduced matrix degradation, reduced elastin breaks, and preserved collagen. Decreased inflammatory cell infiltration and a reduction in the expression of wingless-type mouse mammary virus integration site/β-catenin responsive genes, including matrix metalloproteinase-9, osteoprotegerin, and osteopontin, were observed in the aortas of SOSTTg.ApoE–/– mice. SOST expression was downregulated and the wingless-type mouse mammary virus integration site/β-catenin pathway was activated in human AA samples. The cytosine–phosphate–guanine islands in the SOST gene promoter showed significantly higher methylation in human AA samples compared with controls. Incubation of vascular smooth muscle cells with the demethylating agent 5-azacytidine resulted in upregulation of SOST, suggesting that SOST is epigenetically regulated. Conclusions— This work identifies that SOST is expressed in the aorta and downregulated in human AA possibly because of epigenetic silencing. Upregulating SOST inhibits AA and atherosclerosis development, with potential important implications for treating these vascular diseases.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Health and Medical Research Council
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1527281
Report Number(s):
LLNL-JRNL-698297; 829144
Journal Information:
Arteriosclerosis, Thrombosis, and Vascular Biology, Vol. 37, Issue 3; ISSN 1079-5642
Publisher:
American Heart AssociationCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 114 works
Citation information provided by
Web of Science

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Cited By (20)

Sclerostin: a new biomarker of CKD–MBD journal October 2019
Exploring the Links Between Common Diseases of Ageing—Osteoporosis, Sarcopenia and Vascular Calcification journal November 2018
Abdominal aortic aneurysm: update on pathogenesis and medical treatments journal November 2018
Clinical advantages and disadvantages of anabolic bone therapies targeting the WNT pathway journal September 2018
Depletion of CD11c+ dendritic cells in apolipoprotein E-deficient mice limits angiotensin II-induced abdominal aortic aneurysm formation and growth journal November 2019
Early pathological characterization of murine dissecting abdominal aortic aneurysms journal December 2018
Lifelong genetically lowered sclerostin and risk of cardiovascular disease posted_content February 2019
Up‐regulation of paired‐related homeobox 2 promotes cardiac fibrosis in mice following myocardial infarction by targeting of Wnt5a journal December 2019
WNT Signaling in Cardiac and Vascular Disease journal December 2017
Bones, heart and the new anabolic agent romosozumab journal August 2019
Angiotensin II Signal Transduction: An Update on Mechanisms of Physiology and Pathophysiology journal July 2018
“Osteotropic” Wnt/LRP Signals: High-Wire Artists in a Balancing Act Regulating Aortic Structure and Function journal March 2017
Recent Advances in the Genetics of Atherothrombotic Disease and Its Determinants journal October 2017
Renin-Angiotensin System and Cardiovascular Functions journal July 2018
SM22α (Smooth Muscle 22α) Prevents Aortic Aneurysm Formation by Inhibiting Smooth Muscle Cell Phenotypic Switching Through Suppressing Reactive Oxygen Species/NF-κB (Nuclear Factor-κB) journal January 2019
Updates of Recent Aortic Aneurysm Research journal March 2019
Pharmacologic Management of Aneurysms journal February 2019
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Recombinant Klotho protein enhances cholesterol efflux of THP-1 macrophage-derived foam cells via suppressing Wnt/β-catenin signaling pathway journal March 2020
Novel actions of sclerostin on bone journal February 2019

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