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Updated: Aug 19, 2026

Depletion of Specific Cell Populations by Complement Depletion
Published on: February 5, 2010
The complement system. Activation, modulation, and clinical relevance
1Department of Veterans Affairs Medical Center, New York, New York.
Insights
The complement system, crucial for host defense, generates active products and MAC. Its dysregulation causes angioedema or hemolysis, while deficiencies impair immunity.
Area of Science:
- Immunology
- Biochemistry
Background:
- The complement system comprises plasma proteins activated via classical or alternative pathways.
- Activation leads to biologically active products and Membrane Attack Complex (MAC) assembly.
- Control proteins maintain complement system homeostasis.
Purpose of the Study:
- To elucidate the role of complement proteins in dermatologic disorders.
- To understand the consequences of complement system dysregulation.
Main Methods:
- Analysis of complement system activation pathways.
- Investigation of complement protein functions.
Main Results:
- Complement proteins are integral to the pathogenesis of various skin diseases.
- Complement deficiencies impair host defense mechanisms.
- Uncontrolled complement activation is linked to angioedema and chronic hemolysis.
Conclusions:
- The complement system's balance is critical for immune function and preventing pathological conditions.
- Aberrant complement activity contributes to significant clinical manifestations in dermatology and hematology.
Abstract:
Activation of the classic or the alternative pathway of the complement system results in the generation of biologically active products and the assembly of MAC. Homeostasis is achieved by the presence of control proteins that modulate the activation at various levels. Complement proteins play an important role in the pathogenesis of several dermatologic disorders. Their deficiency is associated with impairment of host-defense; uncontrolled activation of the system results in the development of angioedema or chronic hemolysis.
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