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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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Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

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Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum...
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Overview of the Vascular System01:20

Overview of the Vascular System

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The vascular system comprises an extensive network of arteries, capillaries, and veins. The vascular system can be broadly divided into the blood and lymphatic systems. Typically, blood vessels can be categorized into three histological regions: tunica intima, tunica media, and tunica adventitia. The tunica intima consists of a single layer of endothelial cells attached to the basal lamina. Underlying the basal lamina is a connective tissue layer and an elastic lamina that gives stability and...
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Acute Inflammation II: Local and Systemic Effects01:25

Acute Inflammation II: Local and Systemic Effects

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Acute inflammation produces a coordinated set of local and systemic changes that limit injury, eliminate pathogens, and initiate repair. These responses arise within minutes of infection, trauma, or chemical insult and are driven by vascular alterations and leukocyte-derived mediators. When the stimulus resolves, the reaction typically abates within days.Local EffectsAt the site of injury, arteriolar vasodilation increases blood flow, resulting in redness and warmth. Simultaneously, increased...
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Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

196
Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
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Cytotoxic Edema: Pathophysiology01:21

Cytotoxic Edema: Pathophysiology

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Cytotoxic edema is a form of cerebral edema characterized by intracellular swelling of neurons, astrocytes, and other glial cells. It develops when the mechanisms responsible for maintaining ionic gradients across the cell membrane become impaired. Under normal physiological conditions, the sodium–potassium ATPase actively transports sodium ions out of the cell and potassium ions into the cell, preserving osmotic balance and enabling electrical signaling. This pump requires a continuous...
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Related Experiment Video

Updated: Apr 22, 2026

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion
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Vasculitides and the Complement System: a Comprehensive Review.

Maria Sole Chimenti1, Eleonora Ballanti2, Paola Triggianese2

  • 1Rheumatology Allergology and Clinical Immunology Department of "Medicina dei Sistemi", University of Rome Tor Vergata, Via Montpellier 1, 00133, Rome, Italy. maria.sole.chimenti@uniroma2.it.

Clinical Reviews in Allergy & Immunology
|October 15, 2014
PubMed
Summary

Systemic vasculitides involve blood vessel inflammation. The complement system (CS) plays a key role in their development and presents a potential therapeutic target for these rare autoimmune diseases.

Keywords:
ANCAAnti-complement therapyComplement systemCryoglobulinemiaUrticarial vasculitisVasculitides

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Area of Science:

  • Immunology
  • Rheumatology
  • Pathogenesis of Autoimmune Diseases

Background:

  • Systemic vasculitides are rare autoimmune diseases causing blood vessel inflammation, potentially leading to stenosis or thrombosis.
  • The complement system (CS), part of the innate immune system, is implicated in the pathogenesis of various autoimmune conditions, including vasculitides.
  • CS activation contributes to inflammation-driven tissue injury and modulates both innate and adaptive immune responses.

Purpose of the Study:

  • To review the pathogenetic role of the complement system (CS) in systemic vasculitides.
  • To explore the potential therapeutic applications of targeting the CS in these diseases.

Main Methods:

  • Literature review of the pathogenetic role of CS in systemic vasculitides.
  • Analysis of clinical trial data involving CS modulation.
  • Focus on small-to-medium vessel vasculitides.

Main Results:

  • The CS is demonstrably involved in the inflammatory damage of systemic vasculitides.
  • Evidence supports the efficacy of traditional immunosuppressive therapies.
  • CS modulation is an emerging therapeutic strategy, particularly for small-to-medium vessel vasculitides.

Conclusions:

  • The complement system is a significant factor in the pathogenesis of systemic vasculitides.
  • Targeting the CS offers a promising therapeutic avenue for managing these rare inflammatory conditions.
  • Further research into CS modulation is warranted for effective treatment strategies.