Component
HEK293A cell viability
Viability measured in cultured human HEK293A cells.
1 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
How nutrients influence it
Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
How nutrients reach it in more than one step
Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.
Tracing routes…
What it does
Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.
What acts on it
The same short NADK2-knockdown experiment did not detect reduced HEK293A viability, including in the tested menadione condition.
Experimental context and source evidence
- availability_state
- machinery_impairment Imported condition classification; unverified.
- evidence_span
- {"source_cache": "artifacts/niacin-redox-sources/nadk2-2012.fulltext.txt", "locator": "Results", "start_char": 16830, "end_char": 18219, "file_sha256": "65209c0b4ea7220bc95afdd182e40910f2445345172956e85552d5c6db649648", "text_sha256": "5de49f80d76c73b6a308096c07b330e8d3d53ee28c6a06f4b2a331e4798b45d7"}
- experimental_model
- siRNA; calcein-AM and supporting MTT assays
- exposure
- Three-day knockdown; viability experiment used 12.5 μM menadione for 20 h
- limitations
- Null short-term viability result does not exclude longer-term injury or other cell-type responses; ROS and viability challenges used different concentrations.
- nutrient_topic
- Niacin research collection; topical membership is not evidence of a direct dietary effect. · Niacin (vitamin B3)
- organism
- Homo sapiens
- plain_language
- The oxidant readout rose without a detected loss of viability over this interval.
- primary_references
- [nadk2-2012] Identification and characterization of a human mitochondrial NAD kinase. (2012). https://pubmed.ncbi.nlm.nih.gov/23212377/ DOI: 10.1038/ncomms2262
- tissue_or_cell_type
- HEK293A cells
- trigger_kind
- machinery_impairment Imported condition classification; unverified.
Niacin: NAD metabolism, deficiency and nutrient interactions (2026-09-17) · lines 951–962
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · siRNA; calcein-AM and supporting MTT assays · source_derived_draft · unverified_draft
### b3-redox-nadk2-knockdown-viability-null The same short NADK2-knockdown experiment did not detect reduced HEK293A viability, including in the tested menadione condition. Condition category: machinery_impairment nutrient_topic: Niacin research collection; topical membership is not evidence of a direct dietary effect. plain_language: The oxidant readout rose without a detected loss of viability over this interval. organism: Homo sapiens tissue_or_cell_type: HEK293A cells experimental_model: siRNA; calcein-AM and supporting MTT assays limitations: Null short-term viability result does not exclude longer-term injury or other cell-type responses; ROS and viability challenges used different concentrations. exposure: Three-day knockdown; viability experiment used 12.5 μM menadione for 20 h evidence_span: {"source_cache": "artifacts/niacin-redox-sources/nadk2-2012.fulltext.txt", "locator": "Results", "start_char": 16830, "end_char": 18219, "file_sha256": "65209c0b4ea7220bc95afdd182e40910f2445345172956e85552d5c6db649648", "text_sha256": "5de49f80d76c73b6a308096c07b330e8d3d53ee28c6a06f4b2a331e4798b45d7"} [nadk2-2012] Identification and characterization of a human mitochondrial NAD kinase. (2012). https://pubmed.ncbi.nlm.nih.gov/23212377/ DOI: 10.1038/ncomms2262
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.