Urokinase induces ROS production in vascular smooth muscle cells.

Area of Science:

• Vascular Biology
• Cellular Physiology
• Oxidative Stress Research

Background:

• Urokinase (UK) is a serine protease implicated in various physiological and pathological processes.
• Oxidative stress is increasingly recognized as a key factor in cardiovascular diseases.
• NAD(F)H-oxidases (NOX) are significant sources of reactive oxygen species in vascular cells.

Purpose of the Study:

• To investigate the effect of urokinase on superoxide radical production in cultured aortal smooth muscle cells.
• To determine the role of NAD(F)H-oxidases in urokinase-mediated effects.
• To assess the impact of urokinase on smooth muscle cell proliferation and its relation to oxidative stress.

Main Methods:

• Primary cell culture of aortal smooth muscle cells.
• Measurement of superoxide radical production.
• Assessment of NAD(F)H-oxidase gene expression (nox1, nox4, phox22).
• Evaluation of smooth muscle cell proliferation.
• Pharmacological inhibition using antioxidant ebselen.

Main Results:

• Urokinase significantly stimulated superoxide radical production in smooth muscle cells.
• Urokinase activated the expression of NAD(F)H-oxidases nox1, nox4, and phox22.
• The antioxidant ebselen abolished the urokinase-induced stimulation of smooth muscle cell proliferation.
• These findings indicate urokinase potentiates oxidative stress in the arterial wall.

Conclusions:

• Urokinase promotes oxidative stress in vascular smooth muscle cells via NAD(F)H-oxidase activation.
• Urokinase-induced oxidative stress contributes to smooth muscle cell proliferation.
• Urokinase plays a significant role in adverse arterial remodeling through oxidative stress mechanisms.