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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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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Disorders of the Nervous Tissue01:28

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Nervous tissue is a vital component of the human body's communication system, enabling us to perceive and respond to stimuli. However, like all other tissues, it is vulnerable to disorders and diseases that can significantly impact our neurological functioning.
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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Updated: Nov 28, 2025

High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment
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High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment

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Complement in Neurologic Disease.

Nicholas E Propson1, Manasee Gedam1,2, Hui Zheng1,2,3

  • 1Huffington Center on Aging, Baylor College of Medicine, Houston, Texas 77030, USA.

Annual Review of Pathology
|November 25, 2020
PubMed
Summary
This summary is machine-generated.

The complement system, a key part of innate immunity, is reactivated in the aging brain, contributing to neurodegeneration. Understanding this pathway offers new insights into brain aging and neurological diseases.

Keywords:
Alzheimer's diseaseagingcomplementneurodegenerationvasculature

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Area of Science:

  • Neuroimmunology
  • Neuroscience
  • Immunology

Background:

  • Innate immune signaling pathways are crucial for brain immune responses, utilizing mechanisms found in peripheral immune cells.
  • Despite immune privilege, the brain shows significant complement protein production and activation linked to aging and neurodegeneration.
  • Reactivation of complement signaling in aging and disease impacts various brain cell types.

Purpose of the Study:

  • To review a decade of research on complement activation in the brain.
  • To explore the consequences of complement signaling in aging and neurological diseases.
  • To elucidate the role of different brain cells in complement-mediated processes.

Main Methods:

  • Literature review of studies from the past decade.
  • Analysis of research on complement protein production and activation in the brain.
  • Examination of the involvement of astrocytes, microglia, endothelial cells, oligodendrocytes, neurons, and peripheral immune cells.

Main Results:

  • Complement activation is strongly associated with age-related functional decline and neurodegeneration.
  • The study highlights the reactivation of complement pathways in aging and disease states.
  • Multiple cell types within the brain are implicated in complement-related pathogenesis.

Conclusions:

  • Complement system reactivation is a significant factor in brain aging and neurodegenerative disease.
  • Understanding complement pathways provides novel therapeutic targets for neurological disorders.
  • This review synthesizes current knowledge on complement's role in brain health and disease.