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Altered PPARγ coactivator-1 alpha expression in abdominal aortic aneurysm: Possible effects on mitochondrial biogenesis
Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm.
Department of Medical and Health Sciences, Linköping University.
Department of Medical and Health Sciences, Linköping University.
Department of Medical and Health Sciences, Linköping University.
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2016 (English)In: Journal of Vascular Research, ISSN 1018-1172, E-ISSN 1423-0135, Vol. 53, no 1-2, 17-26 p.Article in journal (Refereed) Published
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Abstract [en]

Introduction: Abdominal aortic aneurysm (AAA) is a complex and deadly vascular disorder. The pathogenesis of AAA includes destruction and phenotypic alterations of the vascular smooth muscle cells (VSMCs) and aortic tissues. PPARγ coactivator-1 alpha (PGC1α) regulates VSMC migration and matrix formation and is a major inducer of mitochondrial biogenesis and function, including oxidative metabolism. Methods: Protein and gene expression of PGC1α and markers for mitochondria biogenesis and cell type-specificity were analysed in AAA aortas from humans and mice and compared against control aortas. Results: Gene expression of PPARGC1A was decreased in human AAA and angiotensin (Ang) II-induced AAA in mice when compared to control vessels. However, high expression of PGC1α was detected in regions of neovascularisation in the adventitia layer. In contrast, the intima/media layer of AAA vessel exhibited defective mitochondrial biogenesis as indicated by low expression of PPARGC1A, VDAC, ATP synthase and citrate synthase. Conclusion: Our results suggest that mitochondrial biogenesis is impaired in AAA in synthetic SMCs in the media, with the exception of newly formed supporting vessels in the adventitia where the mitochondrial markers seem to be intact. To our knowledge, this is the first study investigating PGC1α and mitochondria biogenesis in AAA.

Place, publisher, year, edition, pages
S. Karger, 2016. Vol. 53, no 1-2, 17-26 p.
Keyword [en]
Abdominal aortic aneurysm, Mitochondrial biogenesis, Neovascularisation, PGC1α, Vascular smooth muscle cells
National Category
Cardiac and Cardiovascular Systems
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URN: urn:nbn:se:hj:diva-31210DOI: 10.1159/000446653ISI: XYZPubMedID: 27344146Scopus ID: 2-s2.0-84976581165OAI: oai:DiVA.org:hj-31210DiVA: diva2:951665
Available from: 2016-08-09 Created: 2016-08-09 Last updated: 2017-04-28Bibliographically approved

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