Function and regulation of the complement system in cardiovascular diseases

Area of Science:

• Immunology
• Cardiovascular Biology
• Pathophysiology

Background:

• The complement system is a key component of innate and adaptive immunity.
• Complement activation is implicated in various cardiovascular diseases, including atherosclerosis, aneurysms, and ischemic heart disease.
• Dysregulation of complement, particularly defects in the classical pathway, can lead to conditions like vasculitis and atherosclerosis.

Purpose of the Study:

• To describe complement activation and regulation in cardiovascular diseases.
• To discuss the therapeutic potential of modulating complement activity in cardiovascular disorders.

Main Methods:

• Review of existing literature on complement system's role in cardiovascular diseases.
• Analysis of evidence from experimental animal models.

Main Results:

• Complement is significantly activated in atherosclerotic lesions, arterial aneurysms, and cardiac tissue affected by ischemia or failure.
• Evidence suggests that limiting excessive complement activation could be therapeutically beneficial.
• Deficiencies in the classical complement pathway are linked to increased risk of vasculitis and atherosclerosis, potentially due to impaired clearance of apoptotic cells and immune complex handling.

Conclusions:

• Complement system plays a dual role in cardiovascular diseases, contributing to pathology when overactivated but also being essential for normal function.
• Modulating complement activation presents a promising therapeutic strategy for cardiovascular diseases.
• Further research, particularly in animal models, supports the potential of complement-targeted therapies.