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Related Concept Videos

Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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 exposure to a...
Allergic Drug Reactions01:27

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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 numerous...
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Drug toxicity: Idiosyncratic Reactions

Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
In Vitro Drug Release Testing: Overview, Development and Validation01:10

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In vitro dissolution and drug release tests assess how quickly and how much of a drug is released from its dosage form into an aqueous medium under standardized laboratory conditions. These tests are essential tools in pharmaceutical development and quality assurance, offering insight into the drug's performance before clinical use.During formulation development, dissolution testing identifies incomplete or inconsistent drug release issues. It also supports decisions on selecting the optimal...
Drug Product Performance: In Vitro–In Vivo Correlation01:20

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In pharmaceutical development, it's crucial to establish a predictive in vitro–in vivo correlation (IVIVC) for two or more formulations to gain a comprehensive understanding of release properties. IVIVC reduces the need for costly in vivo studies and facilitates the establishment of meaningful dissolution specifications with significant cost savings and decreased regulatory burden. Furthermore, a meaningful IVIVC should predict Cmax and AUC within 20%, aligning with FDA guidance while adhering...
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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
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Human Liver Microphysiological System for Assessing Drug-Induced Liver Toxicity In Vitro
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Published on: January 31, 2022

Predicting drug hypersensitivity by in vitro tests.

Werner J Pichler1

  • 1Department for Rheumatology and Clinical Immunology/Allergology, Inselspital, University of Bern, Bern, Switzerland. werner.pichler@insel.ch

ALTEX
|October 20, 2009
PubMed
Summary
This summary is machine-generated.

New findings reveal drugs can directly stimulate T cells, bypassing traditional immune responses. This pharmacological interaction of drugs with immune receptors (p-i concept) is key to understanding and predicting drug hypersensitivity reactions.

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Area of Science:

  • Immunology
  • Pharmacology
  • Drug Hypersensitivity

Background:

  • Drug hypersensitivity reactions are often linked to hapten-carrier conjugates.
  • A novel mechanism involving direct T cell stimulation by drugs has been identified.

Purpose of the Study:

  • To introduce the pharmacological interaction of drugs with immune receptors (p-i concept).
  • To highlight the significance of the p-i concept in predicting drug hypersensitivity.
  • To present initial experiments identifying drugs that interact with T cells.

Main Methods:

  • Exploration of the p-i concept mechanism.
  • Identification of drugs interacting directly with T cell receptors.
  • Experimental validation of drug-T cell interactions.

Main Results:

  • Drugs can directly stimulate T cells via T cell receptors, independent of haptenization.
  • The p-i concept is a frequent mechanism in systemic drug hypersensitivity.
  • Initial experiments demonstrate the feasibility of identifying such drugs.

Conclusions:

  • The p-i concept offers a new paradigm for understanding drug hypersensitivity.
  • Predicting drug hypersensitivity may be improved by considering direct drug-T cell interactions.
  • Further research is needed to fully elucidate and apply the p-i concept.