The complement system: history, pathways, cascade and inhibitors

Area of Science:

• Immunology
• Biochemistry

Background:

• The complement system is a critical part of the innate immune system.
• It plays a role in host defense, inflammation, and clearance of immune complexes.
• Dysregulation is linked to numerous diseases.

Purpose of the Study:

• To provide a historical overview of the complement system's discovery and evolution.
• To summarize the key activation pathways of the complement cascade.
• To discuss the regulatory mechanisms that control complement activity.

Main Methods:

• Literature review of historical and contemporary research on the complement system.
• Synthesis of information on complement activation pathways (classical, lectin, alternative).
• Analysis of known complement regulatory proteins and their functions.

Main Results:

• The complement system has a rich history dating back to the 19th century.
• Three main pathways converge to activate the complement cascade.
• A complex network of regulators prevents self-damage.

Conclusions:

• The complement system is a vital and complex immunological entity.
• Understanding its pathways and regulation is crucial for clinical applications.
• Further research continues to uncover its multifaceted roles in health and disease.