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Related Concept Videos

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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...
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Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and microglia. Abnormal...
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Updated: May 12, 2026

A Phenotyping Regimen for Genetically Modified Mice Used to Study Genes Implicated in Human Diseases of Aging
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A new perspective on AMD pathogenesis: a sequential Factor H-centered view of complement dysregulation.

Christine Skerka1, Björn Cochlovius2, Judith P Hüllebrand2

  • 1Koania Complement Analytics, Hamburg, Germany.

Frontiers in Immunology
|May 11, 2026
PubMed
Summary

Age-related macular degeneration (AMD) involves complement proteins like Factor H and FHR1. Understanding their roles in inflammation and cell signaling is key to developing new AMD therapies.

Keywords:
Factor HFactor H-related protein 1age-related macular degenerationcomplementcomplement inhibitors

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Published on: November 15, 2015

Area of Science:

  • Ophthalmology
  • Immunology
  • Genetics

Background:

  • Age-related macular degeneration (AMD) is a leading cause of blindness, influenced by genetics and environment.
  • Genome-wide association studies link the complement system to AMD pathogenesis.
  • Factor H, FHL-1, and FHR1 are key complement regulators implicated in AMD.

Purpose of the Study:

  • To review canonical and non-canonical functions of Factor H, FHL-1, and FHR1.
  • To elucidate the integrated roles of these proteins in AMD pathogenesis.
  • To discuss current and emerging complement-targeted therapies for AMD.

Main Methods:

  • Literature review of complement system functions in AMD.
  • Analysis of genetic and molecular mechanisms.
  • Summary of clinical trial data for complement inhibitors.

Main Results:

  • Factor H and FHL-1 primarily regulate the complement alternative pathway.
  • Factor H has non-canonical functions in cell signaling, metabolism, and inflammation.
  • FHR1 exhibits pro-inflammatory properties, promoting monocyte recruitment in AMD.

Conclusions:

  • The interplay of Factor H, FHL-1, and FHR1 significantly impacts AMD progression.
  • Complement cascade modulation offers therapeutic strategies for AMD.
  • Targeting complement proteins presents a promising avenue for AMD treatment.