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Related Concept Videos

Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial...
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Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

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Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...
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Allergic Drug Reactions01:27

Allergic Drug Reactions

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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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Hypersensitivity Reactions: Immune-Complex Reactions01:19

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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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Pulmonary Tuberculosis III01:31

Pulmonary Tuberculosis III

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Tuberculosis (TB) is a contagious infection primarily affecting the lung parenchyma but which can also affect other body parts. TB can be classified based on disease development, presentation, and the affected anatomical site.
The first classification is based on the development of the disease, and it includes the following categories:
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Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

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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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Related Experiment Video

Updated: Mar 10, 2026

Optimized Protocols for Mycobacterium leprae Strain Management: Frozen Stock Preservation and Maintenance in Athymic Nude Mice
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Type 1 Reaction in Patients With Leprosy Corresponds to a Decrease in Proresolving Lipid Mediators and an Increase in

Carlos A M Silva1,2, Kristofor Webb1,2, Barbara G Andre2

  • 1Mycobacteria Research Laboratories and.

The Journal of Infectious Diseases
|December 10, 2016
PubMed
Summary

Leprosy Type 1 Reaction (T1R) involves altered lipid mediator metabolism. Pro-inflammatory molecules increase while pro-resolving molecules decrease, linking metabolic shifts to T1R pathology.

Keywords:
Leprosylipid mediatorsmetabolomicsspecialized proresolving mediators.type 1 reaction

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Area of Science:

  • Immunology
  • Metabolomics
  • Inflammation Research

Background:

  • Type 1 Reaction (T1R) is an acute T-helper type 1 (Th1) inflammatory episode in leprosy.
  • Previous research focused on immunological responses, neglecting metabolic contributions to T1R pathology.

Purpose of the Study:

  • Investigate metabolic differences in leprosy patients experiencing T1R.
  • Identify specific metabolic pathways and metabolites associated with T1R.

Main Methods:

  • Serum metabolomics analysis using liquid chromatography-mass spectrometry.
  • Comparison of metabolite levels between patients with and without T1R.
  • Validation of metabolite identification and abundance changes.

Main Results:

  • Forty metabolic pathways were perturbed in T1R patients.
  • Seventy-one metabolites were dysregulated, primarily in lipid mediator pathways.
  • Increased levels of pro-inflammatory leukotriene B4 (LTB4) and decreased pro-resolving resolvin D1 (RvD1) were observed.

Conclusions:

  • Metabolic pathway dysregulation links immune responses to T1R pathology.
  • Shifts in lipid mediator balance favor inflammation in T1R.
  • Metabolomics offers insights into the Th1-mediated pathology of leprosy T1R.