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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,...
Toxicity Testing in Animals01:23

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 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: 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...
Pharmaceutical Poisoning: Potential Scenarios01:26

Pharmaceutical Poisoning: Potential Scenarios

Pharmaceutical poisoning can occur through various channels, impacting an estimated 2 million hospitalized patients in the U.S. annually with serious adverse drug responses. These scenarios encompass both therapeutic uses, such as drug toxicity, where even standard dosages can lead to severe central nervous system depression, and non-therapeutic exposures, including accidental ingestion by children, and environmental and occupational exposures.Unintentional poisonings often involve exploratory...
Toxicokinetics: Overview01:21

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...

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Related Experiment Video

Updated: Jun 7, 2026

High Content Screening Analysis to Evaluate the Toxicological Effects of Harmful and Potentially Harmful Constituents (HPHC)
11:38

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Published on: May 10, 2016

Toxicity methods for CPPs.

Per Lundin1, Samir E L Andaloussi, Ulo Langel

  • 1Department of Neurochemistry, Stockholm University, Stockholm, Sweden. per.lundin@neurochem.su.se

Methods in Molecular Biology (Clifton, N.J.)
|November 6, 2010
PubMed
Summary
This summary is machine-generated.

Cell-penetrating peptides (CPPs) are promising drug delivery vectors. This study provides essential in vitro cytotoxicity assay protocols, including membrane integrity and cell viability tests, to ensure the safe clinical translation of CPPs.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Cell-penetrating peptides (CPPs) are widely used as delivery vectors for pharmaceutical cargoes in vitro and in vivo.
  • As CPPs advance towards clinical applications, assessing their toxicity is crucial for safe therapeutic use.

Purpose of the Study:

  • To provide a comprehensive toolbox of in vitro cytotoxicity assays for evaluating CPPs.
  • To establish standardized protocols for toxicity assessment of CPPs before clinical trials.

Main Methods:

  • Detailed protocols for four cytotoxicity assays are described.
  • Assays focus on membrane integrity, including deoxyglucose leakage and propidium iodide uptake.
  • Cell viability is assessed using the MTT assay.
  • Hemolytic properties of CPPs are evaluated.

Main Results:

  • The chapter outlines validated methods for assessing CPP cytotoxicity.
  • Established protocols allow for thorough evaluation of CPPs' impact on cellular functions.
  • The assays provide critical data for the preclinical safety assessment of CPPs.

Conclusions:

  • Standardized in vitro cytotoxicity assays are essential for the development of safe CPP-based therapeutics.
  • This work offers a valuable resource for researchers investigating CPP toxicity.
  • The described protocols facilitate the progression of CPPs towards clinical applications.