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Membrane complement regulatory proteins: insight from animal studies and relevance to human diseases
1Centre for Experimental Therapeutics and Department of Pharmacology, University of Pennsylvania School of Medicine, 1351 BRBII-III, 421 Curie Blvd., Philadelphia, PA 19104, USA.
Insights
Host cells use complement regulatory proteins like DAF, MCP, and CD59 to prevent self-damage. Comparing animal and human proteins reveals insights into disease and treatment.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- The complement system is crucial for host defense but can damage host tissues if dysregulated.
- Membrane-bound complement regulatory proteins (mCRPs) protect host cells from complement-mediated damage.
- Key human mCRPs include decay-accelerating factor (DAF, CD55), membrane cofactor protein (MCP, CD46), and CD59.
Purpose of the Study:
- To review recent advances in understanding membrane-bound complement regulatory proteins (mCRPs).
- To compare the structure, function, and tissue distribution of mCRPs in humans and nonprimate mammals.
- To highlight the relevance of animal mCRP studies to human disease pathogenesis and therapeutics.
Main Methods:
- Literature review of recent studies on mCRPs across species.
- Comparative analysis of mCRP structure and function.
- Examination of tissue distribution patterns.
Main Results:
- Significant similarities and differences exist between human and nonprimate mammalian mCRPs.
- Characterization of animal mCRPs provides insights into their evolutionary conservation and functional variations.
- Understanding species-specific mCRP characteristics is crucial for interpreting their roles in disease.
Conclusions:
- Comparative studies of mCRPs in humans and animals are essential for a comprehensive understanding of complement regulation.
- Insights gained from animal mCRP research can inform the development of novel therapeutic strategies for complement-mediated diseases.
- Further research into animal mCRPs may reveal new targets for treating human inflammatory and autoimmune conditions.
Abstract:
The complement system plays an important role in host defense. However, if not properly regulated, activated complement can also cause significant damage to host tissues. To prevent complement-mediated autologous tissue damage, host cells express a number of membrane-bound complement regulatory proteins. These include decay-accelerating factor (DAF, CD55), membrane cofactor protein (MCP, CD46) and CD59. Recent studies of membrane complement regulatory proteins from various animal species have revealed similarities as well as significant differences from the corresponding human proteins. In this review, we summarize recent advances in this area and contrast the structure, function and tissue distribution of membrane complement regulatory proteins in human and nonprimate mammalian species. We also discuss how the characterization of the animal proteins has provided important clues and might continue to show relevance to the pathogenesis and therapeutics of a number of human diseases.