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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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Primary Human Bronchial Epithelial Cells Grown from Explants
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Cerium dioxide (CeO2) nanoparticles decrease arsenite (As(III)) cytotoxicity to 16HBE14o- human bronchial epithelial

Chao Zeng1, Chi Nguyen1, Scott Boitano2

  • 1Department of Chemical and Environmental Engineering, The University of Arizona, P.O. Box 210011, Tucson, AZ 85721, USA.

Environmental Research
|March 26, 2018
PubMed
Summary
This summary is machine-generated.

Engineered nanoparticles (NPs) can affect contaminant toxicity. Cerium dioxide (CeO2) NPs reduced arsenite (As(III)) toxicity to lung cells by adsorbing the toxicant, highlighting mixture assessment importance.

Keywords:
AdsorptionArsenicCerium dioxideCytotoxicityNanomaterials

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Area of Science:

  • Environmental Science
  • Toxicology
  • Nanotechnology

Background:

  • Engineered nanoparticles (NPs) are increasingly used, raising environmental and health concerns.
  • NPs can act as a "Trojan Horse," enhancing contaminant toxicity by facilitating cellular uptake.
  • Assessing the toxicity of NPs in combination with adsorbed contaminants is crucial.

Purpose of the Study:

  • To evaluate the toxicity of arsenite (As(III)) adsorbed onto cerium dioxide (CeO2) NPs.
  • To investigate the effect of CeO2 NPs on As(III) toxicity in human bronchial epithelial cells (16HBE14o-).
  • To understand the role of As(III) adsorption by CeO2 NPs in mitigating toxicity.

Main Methods:

  • Utilized the xCELLigence real-time cell analyzing system (RTCA) to measure cell viability.
  • Determined As(III) adsorption capacity of CeO2 NPs.
  • Employed transmission electron microscopy (TEM) to visualize NP uptake by cells.

Main Results:

  • 0.5 mg/L As(III) alone reduced cell index by 81.3% over 48h.
  • In the presence of 250 mg/L CeO2 NPs, As(III) toxicity was reduced, with only a 12.9% decrease in cell index.
  • CeO2 NPs demonstrated a high adsorption capacity for As(III) (20.2 mg/g).
  • TEM confirmed uptake of CeO2 NPs into 16HBE14o- cells via engulfment into vesicles.

Conclusions:

  • Dissolved As(III) concentration is the primary determinant of As(III) toxicity to 16HBE14o- cells.
  • CeO2 NPs effectively reduce As(III) toxicity by adsorbing it from the aqueous solution.
  • Evaluating the toxicity of contaminant-NP mixtures is essential for accurate risk assessment.