Collagen-linked fluorescence in human atherosclerotic plaques

Area of Science:

• Biochemistry
• Cardiovascular Research
• Pathology

Background:

• Advanced glycosylation endproducts (AGEs) are crosslinks formed during the Maillard reaction.
• The presence and localization of AGE-modified collagen within arteries, particularly in atherosclerosis, remain largely uncharacterized.

Purpose of the Study:

• To investigate local changes in AGE-modified collagen within human arterial tissue and atherosclerotic plaques.
• To determine the relationship between collagen-linked fluorescence (CLF) and the presence/severity of atherosclerosis.

Main Methods:

• Quantification of AGE-modified collagen using collagen-linked fluorescence (CLF) in human aorta, coronary arteries, tendon, skin, and atherosclerotic plaques.
• Comparison of CLF levels in atheroma-free arterial segments versus plaque-covered areas.
• Correlation analysis between CLF in different tissues and plaque severity.

Main Results:

• All tissues exhibited a characteristic fluorescence peak, indicating AGE-modified collagen.
• CLF in the aorta was significantly decreased in areas covered by superficial plaque compared to adjacent atheroma-free segments (P = 0.01).
• Lower CLF was observed in superficial atherosclerotic plaques of individuals with low to moderate atheroma compared to those with severe atheroma (P = 0.0466).

Conclusions:

• Local alterations in vascular AGE-collagen concentration occur during atherosclerosis.
• These findings suggest a potential pathogenetic role for localized AGE-collagen modifications in the development and progression of atherosclerosis.