Long-term alcohol consumption increases matrix metalloproteinase-2 activity in rat aorta

Area of Science:

• Cardiovascular Science
• Toxicology
• Biochemistry

Background:

• Vascular remodeling, driven by altered extracellular matrix (ECM) degradation, is key in cardiovascular diseases like hypertension.
• While alcohol is a known cardiovascular risk factor, its specific impact on vascular remodeling requires further investigation.

Purpose of the Study:

• To investigate the effect of chronic alcohol consumption on matrix metalloproteinase-2 (MMP-2) activity.
• To explore MMP-2 as a potential mediator of alcohol-induced large vessel remodeling.

Main Methods:

• Female rats were fed diets with ethanol, a pair-fed control, or a standard diet.
• Blood alcohol levels were monitored weekly.
• Aortic MMP activity was assessed using gelatin zymography at 2, 4, and 72 weeks.
• Aortic ECM composition, specifically elastic fibers, was analyzed histochemically.

Main Results:

• Long-term (72 weeks) alcohol consumption significantly increased aortic MMP-2 activity.
• Short-term alcohol consumption (2 and 4 weeks) did not affect MMP-2 activity.
• Histochemical analysis revealed distinct disruption of elastic fibers in aortas of long-term alcohol-fed rats.

Conclusions:

• Chronic alcohol consumption up-regulates MMP-2 activity in rat aortas.
• This MMP-2 upregulation is associated with the degradation of vascular elastin.
• Long-term alcohol intake contributes to vascular remodeling by altering ECM composition.