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Related Concept Videos

Complement System01:27

Complement System

11.1K
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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Renal Corpuscle01:20

Renal Corpuscle

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The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
Glomerulus: Structure and Function
The glomerulus is a tiny, intricate network of capillaries located at the beginning of the nephron. It's enveloped by the Bowman's capsule and receives its blood supply from an afferent arteriole, which divides into numerous...
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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.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
3.0K
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

28
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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Humoral Immune Responses01:36

Humoral Immune Responses

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Overview
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Related Experiment Video

Updated: Feb 18, 2026

Mechanism of Kemeng Fang's Inhibition of Podocyte Apoptosis in Rats with Membranous Nephropathy through the PI3K/AKT Signaling Pathway
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Published on: August 23, 2024

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Complement-Mediated Glomerular Diseases: A Tale of 3 Pathways.

Andrew S Bomback1, Glen S Markowitz2, Gerald B Appel1

  • 1Department of Medicine, Division of Nephrology, Columbia University College of Physicians and Surgeons, New York, New York, USA.

Kidney International Reports
|November 17, 2017
PubMed
Summary
This summary is machine-generated.

The complement system, involving classical, lectin, and alternative pathways, plays a key role in glomerular diseases. Understanding complement activation is crucial for developing targeted therapies for kidney conditions like IgA nephropathy.

Keywords:
C3 glomerulopathyIgA nephropathycomplementglomerulonephritislupusmembranous nephropathynephrotic syndrome

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Area of Science:

  • Nephrology and Immunology
  • Molecular and Cellular Biology

Background:

  • The complement system, a crucial part of innate immunity, comprises three distinct activation pathways: classical, lectin, and alternative.
  • Recent research highlights the significant involvement of all three complement pathways in the pathogenesis of various glomerular diseases.
  • Glomerular lesions, ranging from rare conditions like dense deposit disease to common ones such as IgA nephropathy, are linked to complement activation.

Purpose of the Study:

  • To review the fundamental functions of the classical, lectin, and alternative complement pathways.
  • To elucidate the mechanisms by which complement activation contributes to glomerular injury in a disease-specific manner.
  • To explore the potential of complement-targeted therapies for treating glomerular diseases.

Main Methods:

  • Review of existing literature on complement pathways and glomerular diseases.
  • Analysis of disease-specific data linking complement activation to glomerular pathology.
  • Exploration of preclinical and clinical data on complement-targeted therapeutic strategies.

Main Results:

  • All three complement pathways (classical, lectin, alternative) are implicated in the development of glomerular lesions.
  • Specific patterns of complement activation correlate with distinct glomerular diseases, including rare and common nephropathies.
  • Evidence suggests that dysregulation of complement contributes significantly to kidney damage in these conditions.

Conclusions:

  • The complement system is a central player in the pathophysiology of glomerular diseases.
  • Targeting specific components or pathways of the complement system offers a promising therapeutic avenue.
  • Disease-specific complement inhibition holds potential for effective treatment of glomerular injuries.