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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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Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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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 C4, Infections, and Autoimmune Diseases.

Hongbin Wang1,2,3, Mengyao Liu1

  • 1Master Program of Pharmaceutical Sciences College of Graduate Studies, California Northstate University, Elk Grove, CA, United States.

Frontiers in Immunology
|August 2, 2021
PubMed
Summary
This summary is machine-generated.

Complement C4 deficiency increases susceptibility to infections and autoimmune diseases. This review details C4 diversity, regulation, and interactions, linking C4 deficiency to these conditions and suggesting new therapeutic targets.

Keywords:
C4C4aC4dautoimmune diseasescomplementinfections

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Complement C4 is crucial for innate immunity and the classical/lectin complement pathways.
  • C4 is the most polymorphic protein in the complement system.
  • C4 deficiency is linked to increased risk of infections and autoimmune disorders.

Purpose of the Study:

  • To review complement C4 protein diversity and genetic structures.
  • To discuss the regulation of C4 activation and its derivatives.
  • To update knowledge on C4 molecule interactions in infections and autoimmune diseases.

Main Methods:

  • Literature review of existing research on complement C4.
  • Analysis of genetic diversity and protein structure.
  • Synthesis of data on C4 regulation and interactions.

Main Results:

  • Individuals with C4 deficiency exhibit heightened susceptibility to microbial infections.
  • C4 deficiency is associated with an increased prevalence of autoimmune diseases.
  • Newly identified molecular interactions of C4 offer insights into disease mechanisms.

Conclusions:

  • C4 deficiency links microbial infections and autoimmune disorders.
  • Understanding C4 diversity and interactions is key to developing new therapeutic strategies.
  • This review provides an updated overview of complement C4 research.