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Related Experiment Video

Updated: Jun 19, 2026

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

Published on: January 29, 2014

FUNCTION OF COMPONENTS OF COMPLEMENT IN IMMUNE HEMOLYSIS.

L Pillemer¹, S Seifter, F Chu

¹Institute of Pathology, Western Reserve University, and the University Hospitals, Cleveland.

The Journal of Experimental Medicine

|October 30, 2009

Summary

This summary is machine-generated.

The study reveals that complement components C'1, C'2, and C'4 bind to sheep red blood cells at 1°C. Complement component C'3 is crucial for hemolysis, acting catalytically after other components bind.

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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

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Published on: February 5, 2010

Area of Science:

Immunology
Complement System
Cellular Immunology

Background:

The complement system is a critical part of innate immunity.
Understanding the sequential activation and function of complement components is essential for elucidating immune responses.
Specific interactions of early complement components with target cells require detailed investigation.

Purpose of the Study:

To investigate the binding characteristics of complement components C'1, C'2, C'4, and C'3 to sensitized sheep erythrocytes at low temperatures.
To determine the functional requirements for hemolytic activity mediated by these complement components.

Main Methods:

Incubation of sensitized sheep erythrocytes with specific complement components (C'1, C'2, C'4, C'3) at 1°C.
Assessment of complement component binding to erythrocytes.
Evaluation of hemolytic activity following complement component interactions.

Main Results:

Complement components C'1, C'2, and C'4 were observed to bind to sensitized sheep erythrocytes at 1°C.
Complement component C'3 did not bind to the antibody-sheep cell aggregates under these conditions.
While C'1 could bind independently, its hemolytic activity was dependent on the prior or simultaneous binding of C'4. C'4 binding required C'1.
C'3, despite not binding, was essential for hemolysis, functioning catalytically after C'1, C'2, and C'4 fixation.

Conclusions:

The study elucidates the specific binding requirements and sequential order of early complement component fixation (C'1, C'4, C'2) to initiate complement-mediated hemolysis.
Complement component C'3 plays a critical, non-binding catalytic role in the terminal stages of the complement cascade.
These findings contribute to a deeper understanding of complement system activation pathways and their functional outcomes in immune defense.