Translational evidence that impaired autophagy contributes to arterial ageing

• Published in: The Journal of physiology Vol. 590; no. 14; pp. 3305 - 3316
• Main Authors: LaRocca, Thomas J., Henson, Grant D., Thorburn, Andrew, Sindler, Amy L., Pierce, Gary L., Seals, Douglas R.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01-07-2012; Wiley Subscription Services, Inc; Blackwell Science Inc
• Subjects: Adult; Age; Aged; Aging; Aging - metabolism; Animals; Arteries - growth & development; Arteries - metabolism; Arteries - physiopathology; Autophagy; Autophagy - drug effects; Autophagy - physiology; Bioavailability; Cardiovascular; Cytokines - metabolism; Endothelium; Endothelium, Vascular - metabolism; Female; Forearm - blood supply; Human Umbilical Vein Endothelial Cells - metabolism; Humans; Inflammation; Inflammation - metabolism; Male; Mice; Mice, Inbred C57BL; Nitric oxide; Nitric Oxide - metabolism; Oxidative Stress; Regional Blood Flow; Rodents; Superoxides - metabolism; Trehalose - pharmacology; Vasodilation - physiology
• ISSN: 0022-3751; 1469-7793
• DOI: 10.1113/jphysiol.2012.229690

Key points
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Advancing age is the major risk factor for the development of cardiovascular diseases.
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Arterial endothelial dysfunction, characterized by impaired endothelium‐dependent dilatation (EDD), is a key antecedent to age‐associated clinical cardiovascular disease.
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We tested the hypothesis that changes in autophagy, the process by which cells recycle damaged biomolecules, may be an underlying cause of the age‐related reduction in EDD.
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We show that autophagy is impaired in arteries of older humans and mice with reduced EDD, and that enhancing autophagy restores EDD by reducing superoxide‐dependent oxidative stress and inflammation, and increasing nitric oxide bioavailability.
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Our results identify impaired autophagy as a potential cause of age‐related arterial dysfunction and suggest that boosting autophagy may be a novel strategy for the treatment of arterial endothelial dysfunction and prevention of cardiovascular diseases with ageing.
  Ageing causes arterial endothelial dysfunction that increases the risk of cardiovascular diseases (CVD), but the underlying mechanisms are incompletely understood. The aim of the present study was to determine the role of autophagy, the cellular process of recycling damaged biomolecules, in endothelial dysfunction with ageing. In older humans, expression of autophagy markers in arterial endothelial cells was impaired by ∼50% (P < 0.05) and was associated with an ∼30% (P < 0.05) reduction in arterial endothelium‐dependent dilatation (EDD). Similarly, in C57BL/6 control mice ageing was associated with an ∼40% decrease (P < 0.05) in arterial markers of autophagy and an ∼25% reduction (P < 0.05) in EDD. In both humans and mice, impaired EDD was mediated by reduced nitric oxide (NO) bioavailability and was associated with increased oxidative stress and inflammation (P < 0.05). In old mice, treatment with the autophagy‐enhancing agent trehalose restored expression of autophagy markers, rescued NO‐mediated EDD by reducing oxidative stress, and normalized inflammatory cytokine expression. In cultured endothelial cells, inhibition of autophagy increased oxidative stress and reduced NO production, whereas trehalose enhanced NO production via an autophagy‐dependent mechanism. These results provide the first evidence that autophagy is impaired with ageing in vascular tissues. Our findings also suggest that autophagy preserves arterial endothelial function by reducing oxidative stress and inflammation and increasing NO bioavailability. Autophagy‐enhancing strategies may therefore have therapeutic efficacy for ameliorating age‐associated arterial dysfunction and preventing CVD.