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Related Concept Videos

Toxic Reactions: Overview01:26

Toxic Reactions: Overview

When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Drug Toxicity: Overview01:00

Drug Toxicity: Overview

Drug toxicity quantifies the harm a compound causes to an organism, varying by dose and potentially impacting whole systems or specific organs like the liver. Toxic reactions may arise from venomous insect or spider bites, with effects ranging from mild symptoms to severe outcomes such as brain damage or death. Common forms of acute poisoning include ethanol intoxication and overdose of pain or fever medications, with substances like GHB and heroin being particularly lethal at doses close to...
Toxicokinetics: Overview01:21

Toxicokinetics: Overview

Studies that assess how a drug is absorbed, distributed, metabolized, and excreted (ADME) at toxic doses are termed toxicokinetics. Understanding toxicokinetics helps predict adverse drug reactions (ADRs) and manage toxicity in humans.Toxicokinetics differs from pharmacokinetics mainly in the dose levels studied, with toxicokinetics focusing on higher toxic doses. The kinetics at these levels can be non-linear due to altered physiological processes. Toxicodynamics examines the relationship...
Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test01:22

Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test

In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess the...
Bioactivation and Tissue Toxicity01:25

Bioactivation and Tissue Toxicity

Bioactivation is a metabolic process that transforms less reactive substances into highly reactive metabolites, initiating tissue toxicity. This transformation can lead to various toxic effects, including carcinogenesis and teratogenesis. Reactive metabolites are classified into two main types: electrophiles and free radicals.Electrophiles are electron-deficient species and are produced primarily by the enzyme cytochrome P-450 during the metabolism of compounds containing carbon, nitrogen, or...

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Related Experiment Video

Updated: May 17, 2026

Human Liver Microphysiological System for Assessing Drug-Induced Liver Toxicity In Vitro
11:06

Human Liver Microphysiological System for Assessing Drug-Induced Liver Toxicity In Vitro

Published on: January 31, 2022

Overview of hepatotoxicity.

S A Meyer1

  • 1University of Louisiana-Monroe, Monroe, Louisiana, USA.

Current Protocols in Toxicology
|October 10, 2012
PubMed
Summary
This summary is machine-generated.

This overview explores liver biology and chemical histopathology, examining hepatotoxicity risks from EPA chemicals. It assesses the scope of chemically-induced liver damage and available analytical methods.

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Area of Science:

  • Hepatotoxicity and chemical pathology
  • Liver biology and physiology

Background:

  • Understanding liver function is crucial for studying chemical impacts.
  • Hepatotoxicity is a significant concern with various chemical exposures.

Purpose of the Study:

  • To review key aspects of liver biology and physiology relevant to toxicological studies.
  • To examine the prevalence and risk of hepatotoxicity from chemicals in the EPA IRIS database.
  • To provide an objective assessment of chemically-induced hepatotoxicity.

Main Methods:

  • Literature review of liver biology and physiology.
  • Analysis of chemical data from the EPA IRIS database.
  • Examination of experimental tools for chemical histopathology.

Main Results:

  • Identified salient features of liver biology and physiology.
  • Assessed prevalence and risk of hepatotoxicity for a subset of EPA chemicals.
  • Provided context for liver responses to toxicants and analytical methods.

Conclusions:

  • Chemically-induced hepatotoxicity presents a significant challenge.
  • A comprehensive understanding of liver responses and analytical methods is essential for risk assessment.