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Related Concept Videos

Inflammation01:38

Inflammation

Overview
Inflammatory Response I: Vascular and Cellular01:30

Inflammatory Response I: Vascular and Cellular

The inflammatory response is the body's defense against infection, injury, or irritation from bacteria, trauma, toxins, or heat. Inflammation helps locate and destroy pathogens and remove damaged tissue elements to heal the body. During this initial phase, fluid, blood products, and nutrients migrate to the injured area, resulting in redness, heat, swelling, ache, and loss of function. Moreover, signs of systemic inflammation include fever, increased WBC count, malaise, anorexia, nausea,...
Allergic Drug Reactions01:27

Allergic Drug Reactions

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 numerous...
Inflammatory Response01:28

Inflammatory Response

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,...
Hypersensitivities01:30

Hypersensitivities

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.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
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...

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Related Experiment Video

Updated: Jun 27, 2026

Intra-tracheal Administration of Haemophilus influenzae in Mouse Models to Study Airway Inflammation
09:56

Intra-tracheal Administration of Haemophilus influenzae in Mouse Models to Study Airway Inflammation

Published on: March 2, 2016

Inflammation and hypersensitivity.

E J Goetzl

    International Ophthalmology Clinics
    |January 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Leukotrienes, potent inflammation mediators, are generated by leukocytes from natural stimuli. Their complex roles in immune responses and smooth muscle contraction highlight the need for targeted pharmacological studies.

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    Intra-tracheal Administration of Haemophilus influenzae in Mouse Models to Study Airway Inflammation
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    Advanced Imaging of Lung Homing Human Lymphocytes in an Experimental In Vivo Model of Allergic Inflammation Based on Light-sheet Microscopy
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    Advanced Imaging of Lung Homing Human Lymphocytes in an Experimental In Vivo Model of Allergic Inflammation Based on Light-sheet Microscopy

    Published on: April 16, 2019

    Area of Science:

    • Biochemistry
    • Immunology
    • Pharmacology

    Background:

    • Leukotrienes are key mediators in hypersensitivity and inflammation.
    • Leukocyte-derived leukotrienes play significant roles in various physiological and pathological processes.

    Purpose of the Study:

    • To investigate the generation and function of leukotrienes by leukocytes.
    • To explore the specific roles of different leukotriene subtypes (e.g., LTC4, LTD4, LTB4) in cellular functions and immune responses.

    Main Methods:

    • Utilized sensitive and specific radioimmunoassays to quantify leukotriene generation.
    • Investigated leukotriene effects on leukocyte function, T-lymphocyte activities, and smooth muscle contraction.

    Main Results:

    • Identified significant leukotriene generation by leukocytes stimulated with natural stimuli, independent of exogenous arachidonic acid.
    • C6 peptide leukotrienes (LTC4, LTD4) demonstrated potent vasoactive and smooth muscle contractile effects.
    • LTB4 and other di-HETEs were shown to modulate polymorphonuclear leukocyte function and T-lymphocyte activities, including subset-specific effects on T cells.

    Conclusions:

    • Leukotriene generation and action are complex, involving diverse pathways and receptor interactions.
    • Understanding leukotriene receptor heterogeneity is crucial for developing targeted pharmacological interventions.
    • Further research with well-defined systems is necessary to evaluate the efficacy of leukotriene inhibitors and antagonists.