Systemic Toxicity
Systemic Toxicity - Related Videos
08:49
Vegetated Treatment Systems for Removing Contaminants Associated with Surface Water Toxicity in Agriculture and Urban Runoff
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Cited by 4 •
2017
This article summarizes the design attributes and the effectiveness of treatment systems that treat urban stormwater and agriculture irrigation runoff to remove pesticides and other contaminants associated with aquatic toxicity.
17:28
Human Pluripotent Stem Cell Based Developmental Toxicity Assays for Chemical Safety Screening and Systems Biology Data Generation
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Cited by 47 •
2015
The protocols describe two in vitro developmental toxicity test systems (UKK and UKN1) based on human embryonic stem cells and transcriptome studies. The test systems predict human developmental toxicity hazard, and may contribute to reduce animal studies, costs and the time required for chemical safety testing.
09:06
Growth Assays to Assess Polyglutamine Toxicity in Yeast
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Cited by 3 •
2012
This manuscript describes three complementary protocols for assessing the toxicity of polyglutamine (polyQ)-expansion proteins in the yeast Saccharomyces cerevisiae. These protocols can easily be modified to monitor the toxicity of other misfolded proteins in yeast.
02:05
Evaluating Bacterial Virulence Using the C. elegans Liquid Toxicity Assay
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2026
Source: Chen, Y., et al. Evaluating Virulence and Pathogenesis of Aeromonas Infection in a Caenorhabditis elegans Model. J. Vis. Exp. (2018).This video demonstrates the C. elegans Liquid Toxicity Assay with Aeromonas, a method used to evaluate bacterial virulence by measuring worm survival in a nutrient-limited liquid environment. The assay reveals strain-specific pathogenicity based on the extent of toxin-induced damage and mortality in C. elegans.
09:49
Kupffer Cell Isolation for Nanoparticle Toxicity Testing
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Cited by 28 •
2015
Liver macrophages, named Kupffer cells, are responsible for the capture of circulating nanoparticles. We describe here a method, of high cell purity and yield, for Kupffer cell isolation. The modified LDH assay is used here to measure the toxicity induced by carbon nanotubes in Kupffer cells.
FAQs
Dose determines how much substance can reach biological targets, while exposure duration affects how long tissues remain subjected to that internal concentration. A high dose may produce harmful effects rapidly, whereas repeated or prolonged exposure can create toxicity at lower individual doses. Evaluating both variables helps identify dose-limiting effects and distinguish transient exposure from cumulative risk.
These processes control the substance’s internal concentration and how long it remains available to interact with tissues. Absorption determines entry into circulation, distribution influences which organs encounter the substance, metabolism can alter its biological activity, and excretion removes it. Together, they explain why the same administered dose may produce different toxic effects among substances or individuals.
The therapeutic window reflects the separation between exposures that produce the intended effect and those associated with harmful effects. Systemic toxicity assessment helps locate this boundary by relating internal concentrations and observed adverse effects to dose. A narrower window requires more careful dose selection because relatively small exposure changes may move treatment from beneficial toward dose-limiting toxicity.
Toxicological studies relate exposure conditions to harmful effects across the body, with attention to dose, duration, internal concentrations, and affected organs or tissues. Their purpose is not only to identify whether toxicity occurs, but also to characterize dose-limiting effects and vulnerable organs. These findings support judgments about safety and appropriate medicine development.
Dose selection combines information about therapeutic effects with evidence of harmful exposure. Investigators consider how absorption, distribution, metabolism, and excretion shape internal concentrations, then assess where dose-limiting effects may emerge. This comparison helps establish a therapeutic window and supports choosing doses that retain intended pharmacological activity while reducing the likelihood of systemic harm.
Clinical monitoring applies the same exposure and effect principles used in toxicological assessment to people receiving medicines. It helps identify harmful effects, recognize vulnerable organs, and determine whether exposure remains within an acceptable therapeutic range. In pharmacology, these observations support safer use by informing dose adjustment, ongoing safety evaluation, and decisions about how a medicine should be administered.