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Related Concept Videos

Complement System01:27

Complement System

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 membrane...
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

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...
Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

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 sickness, a systemic...
Antimicrobial Proteins01:23

Antimicrobial Proteins

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.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
Humoral Immune Responses01:36

Humoral Immune Responses

Overview
Antibody Actions01:26

Antibody Actions

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.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...

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Updated: Jun 8, 2026

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
06:29

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

Published on: January 29, 2014

Complement in typical hemolytic uremic syndrome.

Dorothea Orth1, Reinhard Würzner

  • 1Division of Hygiene and Medical Microbiology, Innsbruck Medical University, Innsbruck, Austria.

Seminars in Thrombosis and Hemostasis
|September 25, 2010
PubMed
Summary
This summary is machine-generated.

Hemolytic uremic syndrome (HUS) involves kidney damage from enterohemorrhagic E. coli. Shiga toxin 2 (Stx2) exacerbates HUS by directly harming kidneys and indirectly activating complement, impairing factor H function.

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Related Experiment Videos

Last Updated: Jun 8, 2026

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
06:29

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

Published on: January 29, 2014

Measuring the 50% Haemolytic Complement (CH50) Activity of Serum
08:26

Measuring the 50% Haemolytic Complement (CH50) Activity of Serum

Published on: March 29, 2010

Depletion of Specific Cell Populations by Complement Depletion
06:17

Depletion of Specific Cell Populations by Complement Depletion

Published on: February 5, 2010

Area of Science:

  • Nephrology
  • Microbiology
  • Immunology

Background:

  • Hemolytic uremic syndrome (HUS) is a severe condition with hemolytic anemia, thrombocytopenia, and acute renal failure.
  • HUS presents as typical (diarrhea-associated, linked to E. coli) or atypical (diarrhea-negative, linked to complement disorders).
  • Enterohemorrhagic Escherichia coli's Shiga toxin 2 (Stx2) is a key virulence factor in typical HUS.

Purpose of the Study:

  • To investigate host-side risk factors in HUS, particularly the role of complement activation.
  • To elucidate the mechanisms by which Stx2 contributes to kidney damage in HUS.

Main Methods:

  • Detection of complement activation products in HUS patient serum and plasma.
  • In vitro studies assessing Stx2's direct and indirect effects on kidney cells and complement pathways.

Main Results:

  • Complement activation products were found in HUS patients.
  • Stx2 was shown to directly damage kidney tissue.
  • Stx2 was also found to indirectly damage kidneys by activating complement and inhibiting factor H function.

Conclusions:

  • Stx2 plays a dual role in HUS pathogenesis, causing direct kidney injury and indirect damage through complement dysregulation.
  • Understanding these mechanisms highlights potential therapeutic targets for HUS.
  • Further research into host factors and complement pathways is crucial for managing HUS.