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Aortic dissection (AD) diseases are characterized by degeneration of the aortic media. Oxidative stress plays a crucial role in the development of AD. Reduced nicotinamide adenine dinucleotide phosphate (NADPH) oxidase 1 (NOX1) deficiency reduces the incidence of aortic dissection induced by angiotensin II, but its mechanism remains to be further elucidated. The expression of Fibulin-5 is decreased in patients with AD, but its upstream mechanism is still unclear. This study was to clarify the relationship between NOX1 and Fibulin-5 in the AD. Results showed that the expressions of NOX1 and Fibulin-5 were increased and decreased in the AD, respectively. Next, by employing gain- and loss-of-function approaches in vitro, NOX1 negatively regulated Fibulin-5 in the vascular smooth muscle cells. Moreover, the blunted activity of NOX1 with VAS2870 could upregulate the expression of Fibulin-5. These findings indicate NOX1 is a negative modulator of Fibulin-5 in the AD.

NOX1 Negatively Modulates Fibulin-5 in Vascular Smooth Muscle Cells to Affect Aortic Dissection