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Related Concept Videos

Types of Toxins01:36

Types of Toxins

Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
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: 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...
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...
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...
Toxidromes: Clinical Features01:30

Toxidromes: Clinical Features

Toxidromes are specific patterns of symptoms resulting from toxic substance exposure. They help in the identification and treatment of poisoning. The symptoms of each toxidrome group indicate poisoning by a certain class of chemicals or drugs.1. Sympathomimetic: Stimulates the sympathetic nervous system. Symptoms include agitation, increased heart rate (HR), blood pressure (BP), respiratory rate (RR), temperature, and pupil size. Drugs like cocaine and amphetamines, along with tremors and...

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Vinyl Chloride and High-Fat Diet as a Model of Environment and Obesity Interaction
09:15

Vinyl Chloride and High-Fat Diet as a Model of Environment and Obesity Interaction

Published on: January 12, 2020

Environmental and occupational toxicants.

Frank de Vocht1, Jelle Vlaanderen, Andrew C Povey

  • 1University of Manchester, Manchester, UK. frank.devocht@manchester.ac.uk

IARC Scientific Publications
|September 25, 2012
PubMed
Summary

Biological monitoring analyzes human samples for exposure biomarkers. This helps quantify exposure and calibrate other assessment methods in epidemiological studies.

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Area of Science:

  • Environmental Health
  • Epidemiology
  • Biomonitoring

Background:

  • Biological monitoring analyzes human biological materials for biomarkers of exposure.
  • Biomarkers provide quantitative measures of exposure or dose.
  • These measures are crucial for epidemiological studies and exposure assessment calibration.

Purpose of the Study:

  • To discuss methodological considerations for implementing biomarkers of exogenous exposure in epidemiology.
  • To focus on biomarker characteristics like variability and half-life.
  • To explore the application of biomarkers in various epidemiological study designs.

Main Methods:

  • Review of biomarker characteristics relevant to epidemiological studies.
  • Discussion of biomarker application in different study designs.
  • Focus on quantitative measures of exposure and dose.

Main Results:

  • Biomarker characteristics (variability, half-life) significantly impact study design and interpretation.
  • Appropriate application of biomarkers enhances the accuracy of exposure assessment in epidemiology.
  • Understanding these factors is key to reliable biomonitoring.

Conclusions:

  • Methodological considerations are vital for effective implementation of biomarkers in epidemiology.
  • Biomarker characteristics must be carefully evaluated for accurate exposure assessment.
  • This approach strengthens the validity of epidemiological research on environmental exposures.