Collagen Molecular Damage is a Hallmark of Early Atherosclerosis Development

Area of Science:

• Cardiovascular Research
• Biomedical Engineering
• Molecular Biology

Background:

• Extracellular matrix protein remodeling is crucial in cardiovascular disease development.
• Atherogenesis involves progressive changes in the aorta.
• Early detection of molecular damage is key for cardiovascular disease intervention.

Purpose of the Study:

• To investigate collagen molecular damage during atherogenesis using a novel molecular probe.
• To assess the impact of diet duration and location on collagen damage in the aorta.
• To explore the potential of collagen hybridizing peptide (CHP) for subclinical atherosclerosis diagnosis.

Main Methods:

• Dissection of thoracic aorta from ApoE-/- mice fed a high-fat diet for 0-18 weeks.
• Staining tissues with Cy3-labeled collagen hybridizing peptide (CHP).
• Quantification of CHP fluorescence using a microplate assay to infer collagen damage.

Main Results:

• Collagen molecular damage was dependent on both location within the aorta and duration of the high-fat diet.
• Significant collagen damage was observed in the aortic arch after 18 weeks.
• No significant changes in collagen damage were detected in the descending aorta.

Conclusions:

• Collagen hybridizing peptide (CHP) can detect early molecular damage in collagen during atherogenesis.
• Aortic arch collagen is particularly susceptible to diet-induced damage.
• This approach presents a novel method for the subclinical diagnosis of atherosclerosis.