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Related Concept Videos

Hypersensitivities01:30

Hypersensitivities

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Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
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Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing...
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Asthma is a chronic pulmonary condition involving inflammation of the airways, hyper-reactivity, and reversible obstruction of the airways. This condition can significantly impact a person's quality of life, making breathing difficult and leading to distressing symptoms.
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Related Experiment Video

Updated: Jan 18, 2026

Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis

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NETosis in hypersensitivity disorders.

Manouchehr Fadaee1,2, Reza Aghaei3, Niloufar Orooji4

  • 1Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran. fadaeem@tbzmed.ac.ir.

Molecular Biology Reports
|June 9, 2025
PubMed
Summary
This summary is machine-generated.

Neutrophil extracellular traps (NETs) are crucial in fighting infections but can cause tissue damage in hypersensitivity disorders. Excessive NETosis and poor NET clearance contribute to diseases like vasculitis and lupus.

Keywords:
AllergyAutoimmune diseaseChronic inflammationHypersensitivity reactionNETosis

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Direct Observation of Phagocytosis and NET-formation by Neutrophils in Infected Lungs using 2-photon Microscopy
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Area of Science:

  • Immunology
  • Cell Biology
  • Pathology

Background:

  • Neutrophils are key innate immune cells that rapidly respond to threats.
  • Neutrophil extracellular traps (NETs) are formed via NETosis, releasing antimicrobial components.
  • While NETs combat pathogens, they can also damage host tissues.

Purpose of the Study:

  • To explore the role of NETosis in the pathogenesis of hypersensitivity disorders.
  • To highlight recent advances in understanding NETosis-related disease mechanisms.

Main Methods:

  • Review of current literature on NETosis and hypersensitivity.
  • Analysis of the mechanisms by which NETs contribute to disease.

Main Results:

  • Excessive NETosis and impaired NET clearance are implicated in tissue damage in hypersensitivity disorders.
  • NETs contribute to inflammatory responses and tissue injury by activating T cells.
  • Specific hypersensitivity disorders discussed include small vessel vasculitis (SVV), systemic lupus erythematosus (SLE), and psoriasis.

Conclusions:

  • NETosis plays a significant role in the development of hypersensitivity disorders.
  • Understanding NETosis mechanisms is crucial for developing therapeutic strategies for these conditions.