Component
Human XRCC1
Context-specific entity; species, compartment and exposure are stated on each claim.
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.
Where it participates (unsigned role)
Extracellular NAD+ or NMN restored intracellular NAD availability, PAR-dependent signaling and XRCC1 recruitment in the tested NAD-depleted human cells independently of CD73 status.
Experimental context and source evidence
- evidence_access
- Primary full text
- experimental_model
- Human MCF-7 cells with NAMPT inhibition, CD73 comparison and serum-containing medium; NMN/NR XRCC1 rescue is reported as data not shown.
- limitations
- Rescue depended on medium and incubation time; serum-free and heat-inactivated-serum conditions did not give the same early rescue. No proof of intact cellular NAD uptake or clinical benefit.
- nutrient_topic
- NAD+ collection; molecular form, preparation, species, exposure and manipulation remain explicit. · NAD+
- plain_language
- Supplying precursor material restored part of a repair response in this model.
- primary_references
- Extracellular NAD+ enhances PARP-dependent DNA repair capacity independently of CD73 activity. · 2020 · https://pubmed.ncbi.nlm.nih.gov/31959836/ · DOI 10.1038/s41598-020-57506-9
NAD+: compartmental supply, consumption and cross-nutrient mechanisms (2026-09-19) · lines 260–266
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human MCF-7 cells with NAMPT inhibition, CD73 comparison and serum-containing medium; NMN/NR XRCC1 rescue is reported as data not shown. · source_derived_draft · unverified_draft
## nad-plus-repair-precursor-rescue Supplying precursor material restored part of a repair response in this model. Extracellular NAD+ or NMN restored intracellular NAD availability, PAR-dependent signaling and XRCC1 recruitment in the tested NAD-depleted human cells independently of CD73 status. Model: Human MCF-7 cells with NAMPT inhibition, CD73 comparison and serum-containing medium; NMN/NR XRCC1 rescue is reported as data not shown. Limitations: Rescue depended on medium and incubation time; serum-free and heat-inactivated-serum conditions did not give the same early rescue. No proof of intact cellular NAD uptake or clinical benefit. Evidence access: Primary full text Extracellular NAD+ enhances PARP-dependent DNA repair capacity independently of CD73 activity. · 2020 · https://pubmed.ncbi.nlm.nih.gov/31959836/ · DOI 10.1038/s41598-020-57506-9
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.