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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,...
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...
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...
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...
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...
Drug toxicity: Idiosyncratic Reactions01:16

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...

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Related Experiment Video

Updated: Jun 24, 2026

In Vitro Scratch Assay to Demonstrate Effects of Arsenic on Skin Cell Migration
09:24

In Vitro Scratch Assay to Demonstrate Effects of Arsenic on Skin Cell Migration

Published on: February 23, 2019

Biological responses to arsenic compounds.

Leonidas C Platanias1

  • 1Robert H. Lurie Comprehensive Cancer Center and Division of Hematology-Oncology, Northwestern University Medical School, Chicago, Illinois 60611, USA. l-platanias@northwestern.edu

The Journal of Biological Chemistry
|April 14, 2009
PubMed
Summary

Arsenic trioxide (As(2)O(3)) shows promise as an anti-cancer agent, particularly for leukemia. Emerging research explores blocking cellular pathways to enhance its effectiveness against resistant tumors.

Area of Science:

  • Toxicology
  • Pharmacology
  • Oncology

Background:

  • Arsenic is a metalloid with diverse biological effects.
  • High-dose arsenic exposure can lead to severe health issues, including cancer.
  • Arsenic trioxide (As(2)O(3)) exhibits significant antitumor properties, notably in leukemia treatment.

Purpose of the Study:

  • To explore the therapeutic potential of arsenic compounds in human diseases.
  • To investigate emerging strategies for enhancing As(2)O(3) efficacy.
  • To target cellular pathways involved in As(2)O(3) resistance.

Main Methods:

  • Review of existing research on arsenic and its derivatives.
  • Analysis of cellular pathways affected by As(2)O(3) treatment.
  • Exploration of strategies to overcome treatment resistance.

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Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability
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Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability

Published on: June 21, 2015

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In Vitro Scratch Assay to Demonstrate Effects of Arsenic on Skin Cell Migration
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Assessment of Chemical Toxicity in Adult Drosophila Melanogaster
07:02

Assessment of Chemical Toxicity in Adult Drosophila Melanogaster

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Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability
09:23

Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability

Published on: June 21, 2015

Main Results:

  • As(2)O(3) is an approved treatment for acute promyelocytic leukemia.
  • Research into arsenic compounds for disease treatment is ongoing and promising.
  • Targeting negative feedback pathways may enhance As(2)O(3)'s anti-cancer effects.

Conclusions:

  • Arsenic compounds, particularly As(2)O(3), hold significant therapeutic promise.
  • Blocking specific cellular pathways could improve As(2)O(3) efficacy against resistant cancers.
  • Further research into arsenic derivatives and targeted therapies is warranted.