Glycolaldehyde-modified proteins cause adverse functional and structural aortic remodeling leading to cardiac...

Area of Science:

• Biochemistry
• Cardiovascular Science
• Pathology

Background:

• Advanced glycation end products (AGEs) are implicated in diabetic vascular complications and cardiovascular diseases (CVDs).
• High-molecular-weight AGEs (HMW-AGEs), prevalent in Western diets, have been shown to impair cardiac function.
• The specific impact of HMW-AGEs on vascular function and structure remained largely unknown.

Purpose of the Study:

• To investigate the effects of chronic exposure to HMW-AGEs on vascular function and structure in a rat model.
• To determine if HMW-AGEs contribute to vascular remodeling and oxidative stress.

Main Methods:

• Adult male Sprague Dawley rats received daily injections of HMW-AGEs or a control solution for six weeks.
• Vascular function was assessed by measuring aortic ring contraction and relaxation responses.
• Vascular structure was evaluated by analyzing collagen deposition and intima-media thickness.

Main Results:

• HMW-AGEs exposure led to intracardiac pressure overload, evidenced by increased systolic and mean pressures.
• Aortic rings from HMW-AGEs-treated rats showed enhanced contraction to phenylephrine (PE) and impaired relaxation to acetylcholine (ACh), but not SNP.
• Reduced plasma cyclic GMP levels, increased collagen deposition, and thickened intima-media were observed in HMW-AGEs animals.
• Superoxide dismutase (SOD) administration restored ACh-induced relaxation and reduced the effective dose (EC50).

Conclusions:

• Chronic HMW-AGEs exposure induces adverse vascular remodeling, characterized by disturbed vasomotor function.
• Increased oxidative stress and structural changes in the aorta contribute to HMW-AGEs-induced vascular dysfunction.
• HMW-AGEs play a significant role in the development of cardiovascular diseases (CVDs).