Complement and inflammasome crosstalk in chronic inflammation

Area of Science:

• Immunology
• Innate Immunity
• Chronic Inflammation

Background:

• Chronic inflammation is a hallmark of numerous diseases, including autoimmune disorders, neurodegeneration, and metabolic syndromes.
• The complement system and inflammasomes are key innate immune pathways that mediate inflammation.
• These pathways are increasingly recognized for their interdependence in sustaining chronic inflammatory conditions.

Purpose of the Study:

• To review the mechanistic crosstalk between complement activation and inflammasome signaling, focusing on the NLRP3 inflammasome.
• To elucidate how these two systems interact to drive chronic inflammation and disease progression.
• To explore potential therapeutic strategies targeting the complement-inflammasome axis.

Main Methods:

• Review of existing literature on complement pathways, inflammasome signaling, and their interactions.
• Analysis of shared activation triggers (e.g., ROS, mitochondrial damage) and feedback loops.
• Examination of disease contexts where complement and inflammasome interplay is evident.

Main Results:

• Complement activation drives inflammation via cell recruitment and cytokine induction.
• NLRP3 inflammasome activation is sustained by diverse danger signals in chronic disease.
• Mechanistic intersections include shared triggers, complement-mediated inflammasome priming/activation, and cytokine-driven feedback loops enhancing complement activity.

Conclusions:

• Complement and inflammasomes form self-amplifying loops exacerbating inflammation and tissue damage in diseases like gout, atherosclerosis, and Alzheimer's.
• Targeting these pathways, including dual-targeting approaches, shows clinical promise for immunomodulation.
• Understanding this interplay is crucial for developing precise therapies for chronic inflammatory diseases.