Detection of C3 Nephritic Factor by Hemolytic Assay

Area of Science:

• Immunology
• Complement System Biology

Background:

• C3 nephritic Factor (C3NeF) is an autoantibody targeting the C3 convertase enzyme C3bBb.
• C3NeF stabilizes C3 convertase activity by binding to neoepitopes.

Purpose of the Study:

• To functionally characterize C3NeF using hemolytic assays.
• To explore the alternative pathway of complement activation.

Main Methods:

• Utilized hemolytic assays with pre-activated sheep erythrocytes.
• Employed rabbit anti-sheep red blood cell stroma antibody (hemolysin) for complement activation.
• Leveraged sheep erythrocytes sensitized with C3b to study alternative pathway dynamics.

Main Results:

• Established a method for functional C3NeF characterization.
• Demonstrated the role of sensitized sheep erythrocytes in exploring complement alternative pathway.
• Provided insights into the decay of the alternative pathway C3 convertase.

Conclusions:

• Hemolytic assays with C3b-bearing sheep erythrocytes are effective for C3NeF functional studies.
• This methodology facilitates research into complement alternative pathway regulation and C3NeF activity.