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Hypersensitivity Reactions: Cytolytic Reactions

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...

Hypersensitivity Reactions: Immune-Complex Reactions

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

Antibody Actions

Antibody Actions

Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...

Antibody Structure

Antibody Structure

Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...

Complement System

Complement System

The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a membrane...

Cross-reactivity

Cross-reactivity

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Related Experiment Video

Updated: Jul 3, 2026

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion

Published on: June 15, 2019

Anti-C1q autoantibodies.

Cees G M Kallenberg¹

¹Department of Rheumatology and Clinical Immunology, AA13, University Medical Center Groningen, P.O. Box 30.001, 9700 RB Groningen, The Netherlands.

Autoimmunity Reviews

|July 9, 2008

Summary

Autoantibodies to C1q (anti-C1q) are linked to various diseases. Rising anti-C1q levels may precede lupus nephritis relapses, suggesting a pathogenic role in kidney disease and autoimmunity.

Area of Science:

Immunology
Rheumatology
Nephrology

Background:

Autoantibodies targeting complement components are implicated in diverse pathologies.
Anti-C1q antibodies are consistently found in hypocomplementemic urticarial vasculitis.
Their presence in systemic lupus erythematosus (SLE) lacks diagnostic sensitivity and specificity.

Purpose of the Study:

To investigate the association of anti-C1q antibodies with lupus nephritis.
To explore the potential pathogenic role of anti-C1q in disease flares and autoimmunity.

Main Methods:

Clinical observation of antibody prevalence in different conditions.
Monitoring of anti-C1q antibody levels in relation to disease activity and relapse in SLE patients.
Review of experimental studies on the role of anti-C1q in immune complex-mediated renal disease.

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Human Serum Anti-aquaporin-4 Immunoglobulin G Detection by Cell-based Assay

Published on: April 5, 2019

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Last Updated: Jul 3, 2026

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion

Published on: June 15, 2019

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

Human Serum Anti-aquaporin-4 Immunoglobulin G Detection by Cell-based Assay

Human Serum Anti-aquaporin-4 Immunoglobulin G Detection by Cell-based Assay

Published on: April 5, 2019

Main Results:

Anti-C1q antibodies are more prevalent in proliferative lupus nephritis, especially during active disease.
Elevated anti-C1q levels often precede relapses of lupus nephritis.
Experimental data support a pathogenic role for anti-C1q in immune complex kidney disease.

Conclusions:

Anti-C1q antibodies may play a pathogenic role in lupus nephritis and potentially influence autoimmunity by affecting apoptotic cell clearance.