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Drug Toxicity: Allergic Reactions01:30

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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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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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Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin,...
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Hypersensitivity Reactions: Cytolytic Reactions01:01

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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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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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Author Spotlight: Coproparasitoscopic Examination of Dog Stools for Control and Prevention of Zoonotic Parasite Diseases
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Toxocara canis and the allergic process.

Mauricio Grecco Zaia1, Sandra Regina Pereira de Oliveira1, Cynthia Aparecida de Castro2

  • 1Departamento de Morfologia e Patologia, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos, SP, Brasil.

Memorias Do Instituto Oswaldo Cruz
|October 31, 2015
PubMed
Summary
This summary is machine-generated.

Toxocara canis infection potentiates lung inflammation in ovalbumin-immunised mice. However, anti-ovalbumin IgE levels suggest a potential reduction in allergic inflammation, indicating a complex immune response modulation.

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Area of Science:

  • Immunology
  • Parasitology
  • Allergy Research

Background:

  • Infectious agents can protect against allergic reactions.
  • Helminths modulate host immune responses.
  • The relationship between Toxocara canis and allergies needs further investigation.

Purpose of the Study:

  • To investigate the impact of Toxocara canis infection on allergic responses in ovalbumin-immunised mice.
  • To assess immune cell changes and inflammatory markers in a mouse model.

Main Methods:

  • BALB/c mice were infected with Toxocara canis and immunised with ovalbumin (OVA).
  • Blood and bronchoalveolar lavage fluid cells were analyzed.
  • Interleukin (IL)-4, IL-5, IL-10, and anti-OVA-IgE levels were measured via ELISA.
  • Lung histology was performed.

Main Results:

  • Infected and immunised mice showed increased leukocytes and eosinophils in blood.
  • A lymphocytic inflammatory infiltrate was observed in the liver portal space of infected mice.
  • Anti-OVA-IgE levels were lower in infected and immunised mice compared to controls.

Conclusions:

  • Toxocara canis infection exacerbates lung inflammation in response to ovalbumin.
  • Lower anti-OVA-IgE levels suggest a potential inhibitory effect on the allergic inflammatory process.