Toxic Chemicals
Toxic Chemicals - Related Videos
05:44
In vitro Cell Culture Model for Toxic Inhaled Chemical Testing
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Cited by 25 •
2014
This protocol is designed to demonstrate exposure method of cell cultures to inhaled toxic chemicals. Exposure of differentiated air-liquid interface (ALI) cultures of airway epithelial cells provides a unique model of airway exposure to toxic gases such as chlorine. In this manuscript we describe effect of chlorine exposure on air-liquid interface cultures of epithelial cells and submerged culture of cardiomyocytes. In vitro exposure systems allow important mechanistic studies to evaluate...
07:07
Assessment of Endothelial Cell Migration After Exposure to Toxic Chemicals
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Cited by 9 •
2015
Investigation of early endothelial cell (EEC) migration is important to understand the pathophysiology of certain illnesses and to potentially identify novel strategies for therapeutic intervention. The following protocol describes techniques to assess cell migration that have been adapted for the investigation of EEC.
10:55
Comprehensive Assessment of Germline Chemical Toxicity Using the Nematode Caenorhabditis elegans
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Cited by 11 •
2015
We describe the detailed steps of a high-throughput chemical assay in the nematode Caenorhabditis elegans used to assess germline toxicity. In this assay, disruption of germline function following chemical exposure is monitored using a fluorescent reporter specific to aneuploid embryos.
07:02
Assessment of Chemical Toxicity in Adult Drosophila Melanogaster
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Cited by 21 •
2023
This protocol describes an efficient and inexpensive method that uses liquid media to assess the effects of chemical toxicants on the viability of adult Drosophila melanogaster.
06:25
Evaluating Toxicity of Chemicals using a Zebrafish Vibration Startle Response Screening System
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Cited by 6 •
2024
We describe a screening system's workflow and data analysis for evaluating chemical compound toxicity based on the zebrafish embryo vibration startle response. The system records the movements of zebrafish embryos upon exposure to a vibration stimulus and allows for an integrated evaluation of general toxicity/lethality and neuromuscular toxicity.
FAQs
Toxicity can vary substantially with the amount received, how the substance enters the body, and how long exposure continues. Biological susceptibility also modifies the response because organisms differ in their ability to prevent, detoxify, or repair injury. Considering these variables helps pharmacologists interpret harmful effects accurately rather than treating toxicity as a fixed property of a chemical.
Several molecular pathways can produce toxicity. A chemical may bind to receptors or enzymes, alter their normal activity, damage cell membranes, interfere with metabolism, or generate oxidative stress. These mechanisms can change cellular function even when the initial interaction is highly specific, so identifying the affected target or process helps explain the resulting adverse effects.
A drug candidate may produce a desired biological response while also causing harmful interactions at certain exposures. Pharmacologists therefore examine both intended activity and cellular injury mechanisms when evaluating safety. This distinction supports selection of safer candidates, helps define exposure limits, and clarifies whether an observed response reflects useful pharmacology or an adverse effect.
Evaluation considers exposure amount, route, duration, and biological susceptibility together with the chemical’s effects on receptors, enzymes, membranes, and metabolism. Evidence of oxidative stress or altered cellular function adds mechanistic context. Combining these observations allows researchers to characterize risk, compare potential drug candidates, and establish safer limits for exposure.
Mechanistic toxicology can identify how a harmful substance interacts with biological targets and disrupts cellular processes. That information helps guide treatments intended to reduce harmful interactions or promote elimination. In poisoning management, understanding the exposure conditions and affected pathways provides a scientific basis for assessing injury and selecting measures aimed at limiting further damage.
Environmental risk assessment uses information about toxicity mechanisms and exposure conditions to evaluate potential harm, while biomonitoring examines biological evidence related to exposure. Together, these approaches connect external contact with effects on living organisms. Their findings can support safer exposure limits and improve understanding of how toxic substances affect public health and biological systems.