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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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Inflammatory Response01:28

Inflammatory Response

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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.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
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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...
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Antimicrobial Proteins01:23

Antimicrobial Proteins

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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
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Updated: May 6, 2026

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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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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Overview of complement activation and regulation.

Marina Noris1, Giuseppe Remuzzi

  • 1IRCCS- Istituto di Ricerche Farmacologiche "Mario Negri", Bergamo, Italy.

Seminars in Nephrology
|October 29, 2013
PubMed
Summary
This summary is machine-generated.

The complement system, vital for immunity, can cause severe kidney inflammation when dysregulated. Understanding complement

Keywords:
Complementadaptive immunitycomplement regulatorsinnate immunitykidneykidney diseases

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Area of Science:

  • Immunology and Nephrology: Focuses on the innate immune system's complement cascade and its impact on kidney health.

Background:

  • The complement system is essential for innate immunity, defending against pathogens and clearing cellular debris.
  • Tight regulation prevents self-tissue damage; however, hyperactivation leads to inflammation in various organs.
  • The kidney is particularly susceptible to complement-mediated injury, involving both systemic and local activation.

Purpose of the Study:

  • To review the role of complement system dysregulation in kidney inflammation and disease.
  • To highlight the mechanisms of complement-mediated kidney injury.
  • To discuss the link between abnormal complement activation and various nephropathies.

Main Methods:

  • Literature review of studies on complement activation in kidney diseases.
  • Analysis of mechanisms involving fluid-phase and cell-surface complement regulatory proteins.
  • Examination of pathological findings in complement-related kidney disorders.

Main Results:

  • Hyperactivation of the complement system drives severe inflammatory responses, particularly in the kidney.
  • Kidney injury can result from deposited complement fragments in glomeruli or local complement production.
  • Abnormal complement activation is implicated in immune-complex glomerulonephritis, genetic kidney diseases, and tubulointerstitial injury.

Conclusions:

  • The complement system plays a critical role in the pathogenesis of numerous kidney diseases.
  • Dysfunctional complement regulation contributes significantly to inflammatory kidney damage.
  • Targeting the complement system may offer therapeutic strategies for kidney disorders.