First-pass extracted concept

Ca2+-omission model of in vitro oxidative stress

Candidate: concept label1 source documents6 linked claims

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Extracted Explainers

What the tool is doing

This is the review's named oxidative-stress model used to discuss how extracellular calcium conditions influence vitamin E-dependent cytotoxicity in hepatocytes.

Source 1DOI PubMed

Resources required

The abstract supports use in isolated hepatocyte systems under Ca2+ omission conditions, but does not provide procedural details.

Source 1DOI PubMed

What problem it solves

It provides a defined context for analyzing how GSH depletion, vitamin E status, and protein thiol preservation relate to cell viability.

Source 1DOI PubMed

What it does not solve

The abstract does not show that this model directly generalizes to in vivo oxidative challenge.

Source 1DOI PubMed

Alternatives

The abstract does not name a direct alternative model, though it contrasts broader extracellular Ca2+-related toxicity discussions with the Ca2+-omission framework.

Source 1DOI PubMed

Evidence Snippets

Based on a Ca2+-omission model of in vitro oxidative stress, the role of vitamin E in cytotoxicity is further explored.

Evidence 1Source 1DOI PubMedprovenance

Supporting Sources

Source 1review1989Free Radical Biology and MedicineDOI PubMed

1 evidence snippet 6 linked claims Claim 1 Claim 2 Claim 3

Linked Claims

Claim 1correlation summarysupports1989Source 1DOI PubMed

Alpha-tocopherol threshold-dependent cell viability is directly correlated with prevention of cellular protein thiol loss in the absence of intracellular GSH.

Claim 2mechanistic summarysupports1989Source 1DOI PubMed

In in vitro hepatocyte systems, extracellular Ca2+-related cytotoxicity is reported to depend on Ca2+-influenced vitamin E content of isolated hepatocytes.

Claim 3mechanistic summarysupports1989Source 1DOI PubMed

The Ca2+-omission oxidative stress model indicates interdependence between the GSH redox system and vitamin E as protective agents during oxidative stress.

Claim 4proposed mechanismsupports1989Source 1DOI PubMed

The review proposes that alpha-tocopherol may protect against cytotoxicity either by directly reducing protein thiyl radicals or by preventing protein thiol oxidation through scavenging lipid peroxyl radicals.

Claim 5threshold effectsupports1989Source 1DOI PubMed

After chemical oxidant-induced intracellular GSH depletion, hepatocyte morphology and viability are maintained when cellular alpha-tocopherol remains above a threshold of 0.6-1.0 nmol per 10^6 cells.

Claim 6translational implicationsupports1989Source 1DOI PubMed

Because vitamin E shows a threshold phenomenon in preventing severe oxidative-stress-induced cytotoxicity, its use as a protective agent against oxidative challenge in vivo should be reassessed.