Use of C6- and C7-deficient human sera in quantitative hemolytic assays for C6 and C7

Area of Science:

• Immunology
• Complement System
• Clinical Chemistry

Background:

• The complement system is crucial for innate and adaptive immunity.
• Deficiencies in complement components like C6 and C7 can lead to increased susceptibility to infections, particularly Neisseria meningitidis.
• Accurate quantification of complement components is essential for diagnosing and managing these deficiencies.

Purpose of the Study:

• To describe the development of quantitative hemolytic assays for human complement C6 and C7.
• To validate the linearity and reliability of these newly developed assays.
• To establish normal reference ranges for serum C6 and C7 hemolytic units.

Main Methods:

• Development of quantitative hemolytic assays utilizing sera from patients deficient in C6 or C7 as reagents.
• Assays were performed using standardized procedures to measure hemolytic activity.
• Linearity of the assay results was assessed.

Main Results:

• The developed quantitative hemolytic assays for C6 and C7 demonstrated linear results.
• The normal range for serum C6 was determined to be 21,400--41,700 C6 hemolytic units/ml.
• The normal range for serum C7 was determined to be 5540--9860 C7 hemolytic units/ml.

Conclusions:

• Quantitative hemolytic assays for C6 and C7 have been successfully developed and validated.
• These assays provide reliable measurements of C6 and C7 hemolytic activity.
• The established normal ranges will facilitate the diagnosis of C6 and C7 deficiencies.