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Toxicity Testing in Animals

Toxicity Testing in Animals

Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...

Types of Toxins

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: Overview

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,...

Toxicokinetics: Overview

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 Reactions

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...

Bioactivation and Tissue Toxicity

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: Apr 26, 2026

Author Spotlight: A New and Efficient Method for Comprehensive Metabolite Cytotoxicity Assessment of Triazole Pesticides in Plants

Author Spotlight: A New and Efficient Method for Comprehensive Metabolite Cytotoxicity Assessment of Triazole Pesticides in Plants

Published on: December 22, 2023

Green toxicology.

Alexandra Maertens¹, Nicholas Anastas, Pamela J Spencer

¹Johns Hopkins University, Bloomberg School of Public Health, CAAT, Baltimore, MD, USA.

|July 26, 2014

Summary

This summary is machine-generated.

Green Toxicology integrates safety into chemical design, using advanced methods to prevent harm early. This proactive approach drives innovation for safer, sustainable products by considering toxicity from the molecular level.

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Area of Science:

Toxicology
Green Chemistry
Chemical Design

Background:

Traditional toxicology methods were slow and costly for R&D.
The pharmaceutical industry now uses early-stage toxicity testing.
Green Chemistry aims for safer products, processes, and reduced waste.

Purpose of the Study:

Introduce Green Toxicology as a framework.
Integrate toxicology principles into chemical design.
Minimize potential toxicity early in the production lifecycle.

Main Methods:

Utilizing in silico and in vitro methods.
Applying structure-activity rules (SAR).
Fostering collaboration between synthetic chemists and toxicologists.

Main Results:

Green Toxicology shifts safety considerations to molecular design.
It emphasizes using 21st-century toxicology tools preventatively.
This approach aims to "design out" adverse health and environmental effects.

Conclusions:

Green Toxicology drives innovation by prioritizing safety early.
It increases the likelihood of successful, sustainable product launches.
The concept is spreading internationally and undergoing refinement.