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Multi-Target Peptide Nanofiber Immunotherapy Diminishes Complement Anaphylatoxin Activity in Acute Inflammation.

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Targeting complement anaphylatoxins C3a and C5a with active immunotherapy presents challenges. This study found that while anti-C5a responses are protective, anti-C3a responses are detrimental in sepsis models.

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Area of Science:

  • Immunology
  • Complement System Biology
  • Biomaterials Science

Background:

  • Anaphylatoxins C3a and C5a are key complement cascade products with critical roles in health and disease.
  • They are potential targets for anti-inflammatory active immunotherapies, but dual targeting is complex due to their interrelations.
  • Understanding the dynamic interplay between C3a and C5a is crucial for developing effective immunotherapies.

Purpose of the Study:

  • To investigate a dual-target active immunotherapy against C3a and C5a.
  • To systematically study the effects of varying immune responses against both targets.
  • To explore the use of peptide nanofibers and Design-of-Experiments (DoE) for immunotherapy development.

Main Methods:

  • Utilized self-assembled peptide immunogens displaying defined quantities of C3a and C5a B-cell epitopes.
  • Employed intranasal immunization to induce systemic and mucosal immunity against C3a and C5a.
  • Used a lipopolysaccharide-induced sepsis model to evaluate the effects of anti-C3a and anti-C5a responses.

Main Results:

  • Increasing anti-C5a responses demonstrated a protective effect in the sepsis model.
  • Conversely, increasing anti-C3a responses were found to be detrimental.
  • Survival rates were negatively correlated with the anti-C3a/anti-C5a IgG titer ratio.

Conclusions:

  • The study highlights the complex and opposing roles of C3a and C5a in inflammatory responses.
  • A modular, adjustable biomaterial-based platform allows for the fine-tuning of immune responses against complement targets.
  • This approach offers a promising strategy for developing targeted immunotherapies by managing the balance of immune responses.