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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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Autoimmune Disorders01:29

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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.
Concept and Mechanism of Autoimmune Diseases
The immune...
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Inflammatory Response01:28

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
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T Cell Types and Functions01:24

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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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Tumor Immunotherapy01:27

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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Antibody Actions01:26

Antibody Actions

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Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
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In Vitro Methods for Comparing Target Binding and CDC Induction Between Therapeutic Antibodies: Applications in Biosimilarity Analysis
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Complement as a Therapeutic Target in Systemic Autoimmune Diseases.

María Galindo-Izquierdo1, José Luis Pablos Alvarez1

  • 1Servicio de Reumatología, Instituto de Investigación 12 de Octubre, Universidad Complutense de Madrid, 28040 Madrid, Spain.

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Summary

The complement system (CS) protects the body but its pathological activation drives autoimmune diseases like lupus and rheumatoid arthritis. This review explores CS

Keywords:
complement systempathogenesisrheumatic autoimmune diseasestherapeutic blockade

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Area of Science:

  • Immunology
  • Rheumatology
  • Molecular Biology

Background:

  • The complement system (CS) comprises over 50 proteins crucial for immune defense.
  • CS mediates pathogen recognition, clearance of apoptotic debris, and immune response modulation.
  • Dysregulated CS activation is implicated in numerous autoimmune and inflammatory conditions.

Purpose of the Study:

  • To review the pathogenic role of the complement system in major rheumatologic autoimmune diseases.
  • To discuss the therapeutic potential of targeting the complement system in these conditions.

Main Methods:

  • Literature review of scientific articles and clinical studies.
  • Analysis of the role of complement activation pathways in disease pathogenesis.
  • Evaluation of current and emerging complement-targeted therapies.

Main Results:

  • Pathological complement activation is a key driver in systemic lupus erythematosus, antiphospholipid syndrome, rheumatoid arthritis, dermatomyositis, and ANCA-associated vasculitis.
  • Specific complement components and pathways are critical for disease progression.
  • Therapeutic inhibition of complement components shows promise in preclinical and clinical settings.

Conclusions:

  • The complement system is a significant contributor to the pathogenesis of various rheumatologic autoimmune diseases.
  • Targeting the complement system represents a promising therapeutic strategy for managing these debilitating conditions.