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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...

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The role of complement dysregulation in AMD mouse models.

Jin-Dong Ding¹, Una Kelly, Marybeth Groelle

¹Department of Ophthalmology, Duke University Medical Center, 2351 Erwin Rd, 27710, Durham, NC, USA, jd84@duke.edu.

Advances in Experimental Medicine and Biology

|March 26, 2014

Summary

Genetic variations in complement genes significantly impact age-related macular degeneration (AMD) risk. This study uses genetically modified mice to explore how complement system dysregulation contributes to AMD pathogenesis, offering new insights into disease mechanisms.

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Area of Science:

Ophthalmology
Immunology
Genetics

Background:

Complement gene variations are key risk factors for age-related macular degeneration (AMD).
The precise mechanisms linking complement protein polymorphisms to AMD risk remain largely unknown.
Genetically engineered mouse models are crucial for investigating the complement system's role in AMD.

Purpose of the Study:

To review existing complement-based mouse models of AMD.
To develop and characterize novel mouse models with altered complement activity for AMD research.
To investigate the impact of complement dysregulation on AMD pathogenesis.

Main Methods:

Modeling complement dysregulation in the APOE4 AMD mouse model.
Generating complement factor H knockout (cfh-/-) mice to study excess complement activation.
Utilizing soluble-complement-receptor-1-related protein y (sCrry) mice as complement inhibitors.
Creating humanized CFH mice expressing normal and risk variants of complement factor H.

Main Results:

Established a spectrum of complement dysregulation models in mice.
Characterized ocular phenotypes associated with chronic complement activation and inhibition.
Developed humanized mouse models to study specific complement factor H variants.

Conclusions:

Genetically modified mice provide valuable tools for studying complement's role in AMD.
These models allow for the investigation of specific complement pathways and their contribution to AMD.
Further research using these models can elucidate mechanisms of AMD pathogenesis and inform therapeutic strategies.