A vital role for complement in heart disease
Knut T Lappegård1, Peter Garred2, Lena Jonasson3
1Coronary Care Unit, Division of Internal Medicine, Nordland Hospital, Bodø, Norway; Institute of Clinical Medicine, University of Tromsø, Tromsø, Norway.
Insights
The complement system plays a key role in various heart diseases, including coronary heart disease and heart failure. Understanding its exact role may lead to new therapeutic interventions for cardiac conditions.
Area of Science:
- Cardiology
- Immunology
- Inflammation
Background:
- Heart diseases are a leading cause of death globally.
- Complement-mediated inflammation is increasingly recognized in various cardiac conditions.
- Previous clinical trials with complement inhibitors yielded mixed results.
Purpose of the Study:
- To explore the association between the complement system and diverse heart diseases.
- To highlight the prognostic significance of complement activation in cardiovascular conditions.
- To identify potential therapeutic targets within the complement system for heart disease.
Main Methods:
- Review of emerging evidence on complement system involvement in cardiac pathophysiology.
- Analysis of studies linking complement activation to coronary heart disease, heart failure, and atrial fibrillation.
- Examination of the complement system's role in Chagas heart disease.
Main Results:
- The complement system is implicated in the pathophysiology of coronary heart disease, heart failure, and atrial fibrillation.
- Complement activation holds prognostic importance in heart failure.
- The complement system is crucial in the host-parasite interaction in Chagas heart disease.
Conclusions:
- Complement activation is involved in a wide spectrum of cardiac conditions.
- Further research is needed to elucidate the precise role of complement in different heart diseases.
- Identifying patients who could benefit from complement-targeted therapies is a key future direction.
Abstract:
Heart diseases are common and significant contributors to worldwide mortality and morbidity. During recent years complement mediated inflammation has been shown to be an important player in a variety of heart diseases. Despite some negative results from clinical trials using complement inhibitors, emerging evidence points to an association between the complement system and heart diseases. Thus, complement seems to be important in coronary heart disease as well as in heart failure, where several studies underscore the prognostic importance of complement activation. Furthermore, patients with atrial fibrillation often share risk factors both with coronary heart disease and heart failure, and there is some evidence implicating complement activation in atrial fibrillation. Moreover, Chagas heart disease, a protozoal infection, is an important cause of heart failure in Latin America, and the complement system is crucial for the protozoa-host interaction. Thus, complement activation appears to be involved in the pathophysiology of a diverse range of cardiac conditions. Determination of the exact role of complement in the various heart diseases will hopefully help to identify patients that might benefit from therapeutic complement intervention.
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