Complement's involvement in allergic Th2 immunity: a cross-barrier perspective.

Area of Science:

• Immunology
• Allergy Research
• Complement System Biology

Background:

• Type 2 (Th2) allergic diseases are chronic conditions involving Th2-polarized immune responses.
• These diseases manifest at various barrier sites, including skin, gut, and respiratory tract.
• Increasing global prevalence necessitates a deeper understanding of Th2 allergic disease pathophysiology.

Purpose of the Study:

• To investigate the role of the complement system in the pathophysiology of Type 2 allergic diseases.
• To explore associations between genetic variants in complement genes and allergic disease.
• To examine the involvement of complement pathways across different barrier sites affected by allergy.

Main Methods:

• Review of genetic associations between complement system genes and allergic diseases.
• Analysis of complement protein levels in allergy patients.
• Evaluation of experimental evidence demonstrating complement system involvement in disease development.

Main Results:

• Genetic variants in complement system genes are associated with allergic diseases.
• Elevated levels of certain complement proteins are observed in individuals with allergies.
• The complement system plays a critical role in the development of allergic diseases across skin, gut, and lung barrier sites.

Conclusions:

• The complement system is a significant factor in the development of Type 2 allergic diseases.
• Key complement pathways, specifically C3 and C5, are prominently involved across affected barrier sites.
• Understanding complement's role offers potential therapeutic targets for allergic diseases.