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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
Published on: January 29, 2014
Complement determinations in human disease
M Michael Glovsky1, Peter A Ward, Kent J Johnson
1Huntington Medical Research Institute, Pasadena, California, USA. yksvolg@caltech.edu
Insights
The complement system, crucial for immunity, can cause tissue damage when dysregulated. Understanding complement measurements and its role in diseases like lupus and nephritis is key for developing new therapies.
Area of Science:
- Immunology
- Biochemistry
Background:
- The complement system comprises over 30 proteins, including enzymes, cofactors, and inhibitors, essential for immune defense.
- This cascade protects against pathogens but can cause significant tissue damage (vasculitis, nephritis, arthritis, hemolysis) if uncontrolled.
Purpose of the Study:
- To review techniques for measuring complement.
- To explore the clinical significance of complement alterations in various diseases.
Main Methods:
- Literature review of complement research, articles, and books.
- Author opinion and selection of relevant studies.
Main Results:
- Complement proteins are purified, and genes identified; the cascade mediates host defense and inflammation.
- Pathological complement activation leads to tissue damage in kidneys, blood vessels, joints, and erythrocytes.
Conclusions:
- Complement-mediated tissue destruction is implicated in immune complex diseases like lupus erythematosus and acute respiratory distress syndrome.
- Further research into complement receptors may guide treatments for lupus, hemolytic anemias, and nephritis.
- Gene and antibody therapies require refinement for immunodeficiency treatment.
Objective:
To define techniques used for complement measurements and examine the clinical relevance of alterations of complement determinations in disease.
Data Sources:
Data have been assembled from the authors' research, original articles, and reviews, as well as chapters and complete books on complement.
Study Selection:
Studies were chosen for inclusion by the opinions of the authors, relevant complement reviews, publications, and books.
Results:
Complement has been shown to possess approximately 31 proteins, some of which are enzymes (C1r, C1s, C2, factor B, factor D), some cofactors, some inhibitors or inactivators, and others composed of membrane-integrated proteins. All of the complement proteins have been purified, and many of the respective genes have been identified. The complement cascade is a dual-edged sword, causing protection against bacterial and viral invasion by promoting phagocytosis and inflammation. Pathologically, complement can cause substantial damage to blood vessels (vasculitis), kidney basement membrane and attached endothelial and epithelial cells (nephritis), joint synovium (arthritis), and erythrocytes (hemolysis) if it is not adequately controlled.
Conclusions:
Definitive evidence is available that complement-mediated tissue destruction occurs after immune complex injury in the kidney and lung and may be important in lupus erythematosus and adult respiratory distress syndrome. Future studies on complement receptor structure and function may provide clues to treat effectively lupus, hemolytic anemias, and nephritis. In addition, gene therapy and antibody therapy need further refinement to treat immunodeficiency diseases.
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