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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,...
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...
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...
Drug Distribution: Tissue Binding01:21

Drug Distribution: Tissue Binding

Upon entering the systemic circulation, drugs can distribute into the interstitial and intracellular fluid of various tissue cells. This distribution is facilitated by the binding of drugs to different cellular components within tissues, which may lead to drug accumulation in specific areas. Drugs bound to tissue components serve as reservoirs that release free drugs back into the system, prolonging the drug's overall action. However, this accumulation can also result in local toxicity.
For...
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...
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...

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Solubilization and Bio-conjugation of Quantum Dots and Bacterial Toxicity Assays by Growth Curve and Plate Count
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Biological Responses to Combined Nanoparticles: Uptake, Distribution and Toxicity.

Lu-Lu Chen1, Jun-Hao Guo1, Yuan-Yuan Liu1

  • 1Institute of Nanochemistry and Nanobiology, Shanghai University, Shanghai 200444, China.

Nanomaterials (Basel, Switzerland)
|June 11, 2026
PubMed
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Interactions between mixed nanoparticles (NPs) significantly alter their biological effects, influencing cellular uptake and toxicity outcomes. Understanding these complex nanoparticle mixture interactions is crucial for accurate safety assessments.

Keywords:
biodistributioncellular uptakeco-exposuremixed toxicitynanomaterials

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Area of Science:

  • Nanomaterial safety and toxicology
  • Environmental health sciences
  • Biomedical engineering

Background:

  • Current safety assessments for nanoparticles (NPs) primarily examine individual NP exposure, which differs from real-world scenarios involving NP mixtures.
  • Nanoparticles often coexist with other NPs or NPs of varying sizes, leading to interactions that modify their behavior and biological impact.
  • Understanding the biological effects of mixed NPs is essential for accurate risk assessment in environmental and biomedical contexts.

Purpose of the Study:

  • To review current research on the biological effects of mixed nanoparticles (NPs).
  • To analyze how NP co-exposure influences cellular uptake, distribution, and toxicity.
  • To identify limitations and future research directions for assessing NP mixtures.

Main Methods:

  • Literature review of studies investigating the biological effects of mixed nanoparticles.
  • Analysis of data on NP interactions, dispersion states, and protein corona formation.
  • Examination of in vitro (cellular) and in vivo (animal) studies on NP co-exposure.

Main Results:

  • Co-exposure to mixed NPs alters cellular uptake by modifying NP dispersion and protein corona, affecting uptake routes.
  • Cytotoxicity of NP mixtures can be synergistic, antagonistic, or additive, not always correlating with intracellular NP content.
  • In vivo studies show NP co-exposure impacts absorption, tissue distribution, and clearance, influencing overall toxicity.

Conclusions:

  • The biological response to mixed NPs is complex and depends on altered physicochemical properties and biological interactions.
  • Current research has limitations in standardizing assessments for NP mixtures.
  • Future research should focus on mechanism-based assessments and standardized methodologies for evaluating NP mixtures.