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Enigmatic Roles of Complement Anaphylatoxin Signaling in Health and Disease.

Anthony Shadid1, Kathryn D Hok1, Aleksey Y Domozhirov1

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Summary

Complement anaphylatoxins C3a and C5a are key immune regulators. Their dual role in host defense and disease highlights the need for targeted therapies to modulate their signaling pathways for precision medicine.

Keywords:
Alternative complement pathwayAnaphylatoxinsComplement activationComplement system proteinsImmunologic factors

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Area of Science:

  • Immunology
  • Molecular Biology
  • Pathology

Background:

  • Complement anaphylatoxins C3a and C5a are potent immunomodulators acting via G protein-coupled receptors.
  • Their functions are context-dependent, playing roles in innate immunity, inflammation, and tissue remodeling.

Purpose of the Study:

  • To review the multifaceted roles of C3a and C5a in health and disease.
  • To highlight their involvement in various pathologies including autoimmune diseases, chronic conditions, and cancer.
  • To emphasize the need for a deeper understanding of C3a and C5a signaling for therapeutic complement modulation.

Main Methods:

  • Literature review of C3a and C5a functions in immune responses and disease.
  • Analysis of their roles in microbial clearance, cytokine storm, autoimmune conditions, fibrosis, neurodegeneration, and cancer.
  • Examination of current and emerging complement-targeted therapies.

Main Results:

  • C3a and C5a are crucial for pathogen containment but can drive immunopathology when overactivated.
  • These anaphylatoxins contribute to tissue damage in infectious diseases (e.g., COVID-19, sepsis), autoimmune disorders, and chronic conditions like fibrosis.
  • In cancer, C3a and C5a promote immune evasion, angiogenesis, and metastasis.

Conclusions:

  • Targeting C3a and C5a signaling offers potential for precision medicine approaches.
  • Understanding their complex roles is imperative for developing effective therapies for a wide range of diseases.
  • Further research into complement modulation is crucial for advancing clinical treatments.