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Novel roles of complement in T effector cell regulation
Peter S Heeger1, Claudia Kemper
1Department of Medicine, Recanati Miller Transplant Institute and Immunology Institute, Mount Sinai School of Medicine, New York, USA.
The complement system is crucial for initiating and resolving T cell immunity, preventing autoimmunity. Local complement activity, not systemic, significantly influences immune responses during T cell activation.
Area of Science:
- Immunology
- Complement System Biology
Background:
- The complement system, initially viewed as a simple pathogen clearance mechanism, now recognizes diverse danger signals.
- It is recognized as a key instructor of adaptive B and T cell immunity.
Purpose of the Study:
- To review emerging paradigms of complement function in adaptive immunity.
- To highlight complement's dual role in initiating and contracting T cell responses.
- To discuss the impact of local versus systemic complement on immune modulation.
Main Methods:
- This review synthesizes current research and literature.
- Focuses on recent findings regarding complement's role in Th1 immunity and immune homeostasis.
- Examines evidence for local complement's influence on T cell responses.
Main Results:
- Complement is essential for both the induction and timely contraction of Th1 immunity.
- Proper complement function is vital for preventing autoimmunity and maintaining immune homeostasis.
- Local complement activity plays a more significant role in modulating T cell responses than systemic levels.
Conclusions:
- The complement system is a dynamic regulator of adaptive immunity, extending beyond pathogen recognition.
- Emerging evidence underscores complement's critical role in balancing protective immunity and self-tolerance.
- Understanding local complement dynamics is key to comprehending its immunomodulatory functions.
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