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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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Ammonium toxicity in different cell lines.

M Mirabet1, A Navarro, A Lopez

  • 1Departament de Bioquímica i Biologia Molecular, Facultat de Química, Universitat de Barcelona, Martí Franquès 1, 08028 Barcelona, Spain; telephone: 34-3-4021208; fax: 34-3-4021219.

Biotechnology and Bioengineering
|July 22, 2008
PubMed
Summary
This summary is machine-generated.

Ammonium toxicity varies by cell type. While it affects renal and pituitary cells, it induces apoptosis in lymphoid cells by disrupting calcium levels.

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Area of Science:

  • Biotechnology and Bioengineering
  • Cell Biology
  • Toxicology

Background:

  • Ammonium is a common metabolite and environmental toxin.
  • Understanding ammonium's cellular effects is crucial for various biological and medical contexts.
  • Previous research has indicated potential toxicity, but cell-specific responses were not fully elucidated.

Purpose of the Study:

  • To investigate the differential toxic effects of ammonium on distinct mammalian cell lines.
  • To characterize the cellular mechanisms underlying ammonium-induced toxicity.
  • To compare the impact of ammonium on lymphoid, pituitary, and renal cells.

Main Methods:

  • Exposure of Jurkat (lymphoid), GH(4) (pituitary), and LLC-PK(1) (renal) cell lines to millimolar concentrations of ammonium.
  • Monitoring cell growth, morphology, and viability.
  • Analysis of cell cycle progression and identification of cell death mechanisms (apoptosis).
  • Investigation of potential roles for intracellular calcium mobilization.

Main Results:

  • Ammonium mildly affected GH(4) cell growth and prevented LLC-PK(1) cell growth, causing morphological changes but not cell death.
  • Jurkat cells exhibited distinct responses, accumulating at the S phase and undergoing apoptosis.
  • Ammonium-induced apoptosis in Jurkat cells may be linked to the mobilization of calcium from intracellular stores.

Conclusions:

  • The toxic effects of ammonium are cell-type dependent.
  • Lymphoid cells (Jurkat) are particularly sensitive to ammonium, experiencing apoptosis.
  • Ammonium accumulation can trigger distinct cellular responses, including morphological changes and apoptosis, influenced by intracellular calcium dynamics.