Component
Cell-free metal/peroxide/ascorbate-induced DNA damage
Context-specific entity; species, compartment and exposure are stated on each claim.
2 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
Histidine increased DNA damage in the tested iron/peroxide/ascorbate system and weakened carnosine protection when combined with it.
Experimental context and source evidence
- evidence_access
- Primary abstract
- experimental_model
- Cell-free 10 mM amino-acid comparison.
- limitations
- Not evidence that dietary histidine damages human DNA.
- nutrient_topic
- Carnosine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnosine / beta-alanyl-L-histidine
- plain_language
- The breakdown product did not behave like the intact peptide.
- primary_references
- Antioxidant properties of carnosine re-evaluated with oxidizing systems involving iron and copper ions. · 2005 · https://pubmed.ncbi.nlm.nih.gov/15853927/ · DOI 10.1111/j.1742-7843.2005.pto_03.x
Carnosine: synthesis, transport, carbonyl chemistry and nutrient interactions (2026-09-19) · lines 316–322
AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Cell-free 10 mM amino-acid comparison. · source_derived_draft · unverified_draft
## carnosine-histidine-metal The breakdown product did not behave like the intact peptide. Histidine increased DNA damage in the tested iron/peroxide/ascorbate system and weakened carnosine protection when combined with it. Model: Cell-free 10 mM amino-acid comparison. Limitations: Not evidence that dietary histidine damages human DNA. Evidence access: Primary abstract Antioxidant properties of carnosine re-evaluated with oxidizing systems involving iron and copper ions. · 2005 · https://pubmed.ncbi.nlm.nih.gov/15853927/ · DOI 10.1111/j.1742-7843.2005.pto_03.x
Complete structured claim and evidenceAt 10 mM, carnosine reduced DNA damage caused by copper- or iron/peroxide/ascorbate systems.
Experimental context and source evidence
- evidence_access
- Primary abstract
- experimental_model
- Cell-free metal-catalyzed oxidation.
- limitations
- Millimolar assay; does not show safe systemic metal chelation.
- nutrient_topic
- Carnosine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnosine / beta-alanyl-L-histidine
- plain_language
- Its chemical protection depended on the oxidation system.
- primary_references
- Antioxidant properties of carnosine re-evaluated with oxidizing systems involving iron and copper ions. · 2005 · https://pubmed.ncbi.nlm.nih.gov/15853927/ · DOI 10.1111/j.1742-7843.2005.pto_03.x
Carnosine: synthesis, transport, carbonyl chemistry and nutrient interactions (2026-09-19) · lines 308–314
AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Cell-free metal-catalyzed oxidation. · source_derived_draft · unverified_draft
## carnosine-metal-dna Its chemical protection depended on the oxidation system. At 10 mM, carnosine reduced DNA damage caused by copper- or iron/peroxide/ascorbate systems. Model: Cell-free metal-catalyzed oxidation. Limitations: Millimolar assay; does not show safe systemic metal chelation. Evidence access: Primary abstract Antioxidant properties of carnosine re-evaluated with oxidizing systems involving iron and copper ions. · 2005 · https://pubmed.ncbi.nlm.nih.gov/15853927/ · DOI 10.1111/j.1742-7843.2005.pto_03.x
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.