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Related Concept Videos

Complement System01:27

Complement System

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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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Related Experiment Video

Updated: Sep 12, 2025

Generation of Human Microglia to Combine Them with Retinal Organoids for Improved Disease Modeling
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Retinal degenerative diseases: Complement system-microglia crosstalk.

Jia Gao1, Wei Wang2, Ya Mo1

  • 1Department of Ophthalmology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China; Eye School of Chengdu University of Traditional Chinese Medicine, China.

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|August 7, 2025
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Retinal degenerative diseases involve complement system and microglia crosstalk, driving vision loss. Targeting these pathways offers potential treatments for blinding eye conditions.

Keywords:
Age-related diseasesAgingComplement systemInflammationMicrogliaRetinal degenerative diseases

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Area of Science:

  • Ophthalmology
  • Immunology
  • Neuroscience

Background:

  • Retinal degenerative diseases (RDD) cause progressive vision loss with no current effective treatments.
  • The complement system and retinal microglia are implicated in RDD pathogenesis.
  • A positive feedback loop exists between complement activation and microglial activation, worsening retinal damage.

Purpose of the Study:

  • To review the crosstalk between the complement system and microglia in major RDDs.
  • To summarize current clinical studies targeting these pathways for RDD treatment.

Main Methods:

  • Literature review focusing on the interplay of complement and microglia in RDD.
  • Analysis of clinical trials targeting complement or microglia.

Main Results:

  • Complement activation products (C3a, C5a) activate microglia via C3aR and C5aR1.
  • Activated microglia produce C1q, further activating the complement system.
  • This crosstalk is observed in age-related macular degeneration, diabetic retinopathy, glaucoma, and pathological myopia.

Conclusions:

  • The complement system and microglia interaction is a key driver of RDD.
  • Targeting this crosstalk presents a promising therapeutic strategy for RDD.