Component

N-Acetyl-p-benzoquinone imine / NAPQI

N-Acetyl-p-benzoquinone imine / NAPQI. Species, exposure and limitations are retained in each linked claim.

9 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

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.

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.

Recorded relationships

What it acts on

  1. Peptide mapping identified NAPQI binding to GSS Cys422.

    N-Acetyl-p-benzoquinone imine / NAPQI → Human glutathione synthetase / GSS source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    evidence_span
    {"source_cache": "artifacts/glutathione-research/27086508.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "3170945d1b6429e4d069dffe5fefd919b06714d7bea8a2b82d4b9eda916e9cad", "start_char": 0, "end_char": 1383, "text_sha256": "3170945d1b6429e4d069dffe5fefd919b06714d7bea8a2b82d4b9eda916e9cad"}
    experimental_model
    Mass spectrometry and in-vitro inhibition
    exposure
    0.77 micromolar enzyme with 25–400 micromolar NAPQI
    limitations
    Biological relevance and contribution to human 5-oxoprolinuric acidosis remain unproven.
    nutrient_topic
    Glutathione research collection; topical membership is not evidence of a direct dietary effect. · GSH
    organism
    Human GSS preparation
    plain_language
    The reactive metabolite can attack synthesis machinery in vitro.
    primary_references
    [glutathione-p27086508] The acetaminophen metabolite N-acetyl-p-benzoquinone imine (NAPQI) inhibits glutathione synthetase in vitro; a clue to the mechanism of 5-oxoprolinuric acidosis? (2017). https://pubmed.ncbi.nlm.nih.gov/27086508/ DOI: 10.3109/00498254.2016.1166533
    tissue_or_cell_type
    Purified synthesis enzyme
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    Glutathione: metabolism, signaling and nutrient connections (2026-09-17) · lines 1074–1085

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Mass spectrometry and in-vitro inhibition · source_derived_draft · unverified_draft

    ### glutathione-napqi-gss-binding Peptide mapping identified NAPQI binding to GSS Cys422. Condition category: machinery_impairment nutrient_topic: Glutathione research collection; topical membership is not evidence of a direct dietary effect. plain_language: The reactive metabolite can attack synthesis machinery in vitro. organism: Human GSS preparation tissue_or_cell_type: Purified synthesis enzyme experimental_model: Mass spectrometry and in-vitro inhibition limitations: Biological relevance and contribution to human 5-oxoprolinuric acidosis remain unproven. exposure: 0.77 micromolar enzyme with 25–400 micromolar NAPQI evidence_span: {"source_cache": "artifacts/glutathione-research/27086508.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "3170945d1b6429e4d069dffe5fefd919b06714d7bea8a2b82d4b9eda916e9cad", "start_char": 0, "end_char": 1383, "text_sha256": "3170945d1b6429e4d069dffe5fefd919b06714d7bea8a2b82d4b9eda916e9cad"} [glutathione-p27086508] The acetaminophen metabolite N-acetyl-p-benzoquinone imine (NAPQI) inhibits glutathione synthetase in vitro; a clue to the mechanism of 5-oxoprolinuric acidosis? (2017). https://pubmed.ncbi.nlm.nih.gov/27086508/ DOI: 10.3109/00498254.2016.1166533
    Complete structured claim and evidence

  2. NAPQI at 25–400 micromolar irreversibly reduced measured GSS activity by 16–89%.

    N-Acetyl-p-benzoquinone imine / NAPQI → Human glutathione synthetase catalytic activity source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    evidence_span
    {"source_cache": "artifacts/glutathione-research/27086508.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "3170945d1b6429e4d069dffe5fefd919b06714d7bea8a2b82d4b9eda916e9cad", "start_char": 0, "end_char": 1383, "text_sha256": "3170945d1b6429e4d069dffe5fefd919b06714d7bea8a2b82d4b9eda916e9cad"}
    experimental_model
    Mass spectrometry and in-vitro inhibition
    exposure
    0.77 micromolar enzyme with 25–400 micromolar NAPQI
    limitations
    Biological relevance and contribution to human 5-oxoprolinuric acidosis remain unproven.
    nutrient_topic
    Glutathione research collection; topical membership is not evidence of a direct dietary effect. · GSH
    organism
    Human GSS preparation
    plain_language
    The assay suggests a possible feedback problem: stress can impair replenishment.
    primary_references
    [glutathione-p27086508] The acetaminophen metabolite N-acetyl-p-benzoquinone imine (NAPQI) inhibits glutathione synthetase in vitro; a clue to the mechanism of 5-oxoprolinuric acidosis? (2017). https://pubmed.ncbi.nlm.nih.gov/27086508/ DOI: 10.3109/00498254.2016.1166533
    tissue_or_cell_type
    Purified synthesis enzyme
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    Glutathione: metabolism, signaling and nutrient connections (2026-09-17) · lines 1087–1098

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Mass spectrometry and in-vitro inhibition · source_derived_draft · unverified_draft

    ### glutathione-napqi-gss-inhibition NAPQI at 25–400 micromolar irreversibly reduced measured GSS activity by 16–89%. Condition category: machinery_impairment nutrient_topic: Glutathione research collection; topical membership is not evidence of a direct dietary effect. plain_language: The assay suggests a possible feedback problem: stress can impair replenishment. organism: Human GSS preparation tissue_or_cell_type: Purified synthesis enzyme experimental_model: Mass spectrometry and in-vitro inhibition limitations: Biological relevance and contribution to human 5-oxoprolinuric acidosis remain unproven. exposure: 0.77 micromolar enzyme with 25–400 micromolar NAPQI evidence_span: {"source_cache": "artifacts/glutathione-research/27086508.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "3170945d1b6429e4d069dffe5fefd919b06714d7bea8a2b82d4b9eda916e9cad", "start_char": 0, "end_char": 1383, "text_sha256": "3170945d1b6429e4d069dffe5fefd919b06714d7bea8a2b82d4b9eda916e9cad"} [glutathione-p27086508] The acetaminophen metabolite N-acetyl-p-benzoquinone imine (NAPQI) inhibits glutathione synthetase in vitro; a clue to the mechanism of 5-oxoprolinuric acidosis? (2017). https://pubmed.ncbi.nlm.nih.gov/27086508/ DOI: 10.3109/00498254.2016.1166533
    Complete structured claim and evidence

What acts on it

  1. Using acetaminophen as a probe, at low concentrations it is converted in a cooxidation reaction with arachidonic acid to the dimer 4,4-dihydroxy-3,3-biacetanilide and other polymeric products, and the electrophilic metabolite N-acetyl-p-benzoquinone imine was detected directly and indirectly by its reaction with glutathione to form 3-S-glutathionylacetaminophen; the same products were formed by the synthase with hydrogen peroxide in reactions not inhibited by indomethacin, and formation of all products was inhibited by ascorbic acid and butylated hydroxyanisole.

    Cyclooxygenase-1 (PTGS1) → N-Acetyl-p-benzoquinone imine / NAPQI source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/paracetamol-research/3124965.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "dcc85a1ab66984973092042b5553f43fbbe5eb10b674614c9b1fa991b3969502", "start_char": 0, "end_char": 2236, "text_sha256": "dcc85a1ab66984973092042b5553f43fbbe5eb10b674614c9b1fa991b3969502"}
    experimental_model
    Ram seminal vesicle microsomal prostaglandin H synthase with product identification by cooxidation
    exposure
    Acetaminophen from 20 micromolar to above 10 millimolar, with glutathione, ascorbate and indomethacin
    limitations
    Shows that the drug both stimulates and inhibits the same enzyme depending on concentration, and that the enzyme makes NAPQI from it. A microsomal preparation at concentrations far above therapeutic.
    nutrient_topic
    Paracetamol research collection; topical membership is not evidence of a direct clinical effect, and the drug is recorded separately from the metabolites NAPQI and AM404. · Paracetamol
    organism
    Sheep
    plain_language
    The prostaglandin enzyme can itself turn the drug into the liver-damaging metabolite.
    primary_references
    [apap-p3124965] Acetaminophen and analogs as cosubstrates and inhibitors of prostaglandin H synthase. (1988). https://pubmed.ncbi.nlm.nih.gov/3124965/ DOI: 10.1016/0009-2797(88)90101-9
    tissue_or_cell_type
    Seminal vesicle microsomes

    Paracetamol: the enzyme it reduces rather than blocks, the isoform that turned out not to exist, the metabolite that carries the analgesia, and the metabolite that destroys the liver (2026-09-22) · lines 129–140

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Ram seminal vesicle microsomal prostaglandin H synthase with product identification by cooxidation · source_derived_draft · unverified_draft

    ### apap-the-enzyme-makes-napqi Using acetaminophen as a probe, at low concentrations it is converted in a cooxidation reaction with arachidonic acid to the dimer 4,4-dihydroxy-3,3-biacetanilide and other polymeric products, and the electrophilic metabolite N-acetyl-p-benzoquinone imine was detected directly and indirectly by its reaction with glutathione to form 3-S-glutathionylacetaminophen; the same products were formed by the synthase with hydrogen peroxide in reactions not inhibited by indomethacin, and formation of all products was inhibited by ascorbic acid and butylated hydroxyanisole. Condition category: normal nutrient_topic: Paracetamol research collection; topical membership is not evidence of a direct clinical effect, and the drug is recorded separately from the metabolites NAPQI and AM404. plain_language: The prostaglandin enzyme can itself turn the drug into the liver-damaging metabolite. organism: Sheep tissue_or_cell_type: Seminal vesicle microsomes experimental_model: Ram seminal vesicle microsomal prostaglandin H synthase with product identification by cooxidation limitations: Shows that the drug both stimulates and inhibits the same enzyme depending on concentration, and that the enzyme makes NAPQI from it. A microsomal preparation at concentrations far above therapeutic. exposure: Acetaminophen from 20 micromolar to above 10 millimolar, with glutathione, ascorbate and indomethacin evidence_span: {"source_cache": "artifacts/paracetamol-research/3124965.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "dcc85a1ab66984973092042b5553f43fbbe5eb10b674614c9b1fa991b3969502", "start_char": 0, "end_char": 2236, "text_sha256": "dcc85a1ab66984973092042b5553f43fbbe5eb10b674614c9b1fa991b3969502"} [apap-p3124965] Acetaminophen and analogs as cosubstrates and inhibitors of prostaglandin H synthase. (1988). https://pubmed.ncbi.nlm.nih.gov/3124965/ DOI: 10.1016/0009-2797(88)90101-9
    Complete structured claim and evidence

  2. Cytochrome-P450-mediated acetaminophen oxidation produced NAPQI in the experimental oxidation system.

    Paracetamol → N-Acetyl-p-benzoquinone imine / NAPQI source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/glutathione-research/6424115.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "8c45563e89388d200eb64ae63d12b388ef5cca91369a585157ef27b39f525b08", "start_char": 0, "end_char": 1307, "text_sha256": "8c45563e89388d200eb64ae63d12b388ef5cca91369a585157ef27b39f525b08"}
    experimental_model
    Enzyme oxidation and radiolabeled binding assays
    exposure
    NAPQI or acetaminophen with reductants
    limitations
    Experimental chemistry; no new human dose threshold or treatment regimen is inferred.
    nutrient_topic
    Glutathione research collection; topical membership is not evidence of a direct dietary effect. · GSH
    organism
    Mouse microsomes and cell-free cytochrome-P450 system
    plain_language
    The parent drug and its reactive metabolite are separate chemical entities.
    primary_references
    [glutathione-p6424115] N-acetyl-p-benzoquinone imine: a cytochrome P-450-mediated oxidation product of acetaminophen. (1984). https://pubmed.ncbi.nlm.nih.gov/6424115/ DOI: 10.1073/pnas.81.5.1327
    tissue_or_cell_type
    Acetaminophen reactive-metabolite handling

    Glutathione: metabolism, signaling and nutrient connections (2026-09-17) · lines 1048–1059

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Enzyme oxidation and radiolabeled binding assays · source_derived_draft · unverified_draft

    ### glutathione-acetaminophen-napqi Cytochrome-P450-mediated acetaminophen oxidation produced NAPQI in the experimental oxidation system. Condition category: normal nutrient_topic: Glutathione research collection; topical membership is not evidence of a direct dietary effect. plain_language: The parent drug and its reactive metabolite are separate chemical entities. organism: Mouse microsomes and cell-free cytochrome-P450 system tissue_or_cell_type: Acetaminophen reactive-metabolite handling experimental_model: Enzyme oxidation and radiolabeled binding assays limitations: Experimental chemistry; no new human dose threshold or treatment regimen is inferred. exposure: NAPQI or acetaminophen with reductants evidence_span: {"source_cache": "artifacts/glutathione-research/6424115.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "8c45563e89388d200eb64ae63d12b388ef5cca91369a585157ef27b39f525b08", "start_char": 0, "end_char": 1307, "text_sha256": "8c45563e89388d200eb64ae63d12b388ef5cca91369a585157ef27b39f525b08"} [glutathione-p6424115] N-acetyl-p-benzoquinone imine: a cytochrome P-450-mediated oxidation product of acetaminophen. (1984). https://pubmed.ncbi.nlm.nih.gov/6424115/ DOI: 10.1073/pnas.81.5.1327
    Complete structured claim and evidence

  3. Ascorbic acid decreased binding through reduction of NAPQI to acetaminophen in the comparison.

    L-Ascorbate → N-Acetyl-p-benzoquinone imine / NAPQI source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/glutathione-research/6424115.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "8c45563e89388d200eb64ae63d12b388ef5cca91369a585157ef27b39f525b08", "start_char": 0, "end_char": 1307, "text_sha256": "8c45563e89388d200eb64ae63d12b388ef5cca91369a585157ef27b39f525b08"}
    experimental_model
    Enzyme oxidation and radiolabeled binding assays
    exposure
    NAPQI or acetaminophen with reductants
    limitations
    Cell-free/microsomal finding; vitamin C is not established here as a clinical antidote.
    nutrient_topic
    Glutathione research collection; topical membership is not evidence of a direct dietary effect. · GSH
    organism
    Mouse microsomes and cell-free cytochrome-P450 system
    plain_language
    Different reductants changed the same reactive intermediate by different chemistry.
    primary_references
    [glutathione-p6424115] N-acetyl-p-benzoquinone imine: a cytochrome P-450-mediated oxidation product of acetaminophen. (1984). https://pubmed.ncbi.nlm.nih.gov/6424115/ DOI: 10.1073/pnas.81.5.1327
    tissue_or_cell_type
    Acetaminophen reactive-metabolite handling

    Glutathione: metabolism, signaling and nutrient connections (2026-09-17) · lines 1061–1072

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Enzyme oxidation and radiolabeled binding assays · source_derived_draft · unverified_draft

    ### glutathione-napqi-ascorbate Ascorbic acid decreased binding through reduction of NAPQI to acetaminophen in the comparison. Condition category: normal nutrient_topic: Glutathione research collection; topical membership is not evidence of a direct dietary effect. plain_language: Different reductants changed the same reactive intermediate by different chemistry. organism: Mouse microsomes and cell-free cytochrome-P450 system tissue_or_cell_type: Acetaminophen reactive-metabolite handling experimental_model: Enzyme oxidation and radiolabeled binding assays limitations: Cell-free/microsomal finding; vitamin C is not established here as a clinical antidote. exposure: NAPQI or acetaminophen with reductants evidence_span: {"source_cache": "artifacts/glutathione-research/6424115.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "8c45563e89388d200eb64ae63d12b388ef5cca91369a585157ef27b39f525b08", "start_char": 0, "end_char": 1307, "text_sha256": "8c45563e89388d200eb64ae63d12b388ef5cca91369a585157ef27b39f525b08"} [glutathione-p6424115] N-acetyl-p-benzoquinone imine: a cytochrome P-450-mediated oxidation product of acetaminophen. (1984). https://pubmed.ncbi.nlm.nih.gov/6424115/ DOI: 10.1073/pnas.81.5.1327
    Complete structured claim and evidence

  4. Adding GSH decreased covalent microsomal protein binding while forming 3-S-glutathionylacetaminophen.

    GSH → N-Acetyl-p-benzoquinone imine / NAPQI source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/glutathione-research/6424115.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "8c45563e89388d200eb64ae63d12b388ef5cca91369a585157ef27b39f525b08", "start_char": 0, "end_char": 1307, "text_sha256": "8c45563e89388d200eb64ae63d12b388ef5cca91369a585157ef27b39f525b08"}
    experimental_model
    Enzyme oxidation and radiolabeled binding assays
    exposure
    NAPQI or acetaminophen with reductants
    limitations
    Experimental chemistry; no new human dose threshold or treatment regimen is inferred.
    nutrient_topic
    Glutathione research collection; topical membership is not evidence of a direct dietary effect. · GSH
    organism
    Mouse microsomes and cell-free cytochrome-P450 system
    plain_language
    Glutathione diverted the reactive metabolite into a conjugate.
    primary_references
    [glutathione-p6424115] N-acetyl-p-benzoquinone imine: a cytochrome P-450-mediated oxidation product of acetaminophen. (1984). https://pubmed.ncbi.nlm.nih.gov/6424115/ DOI: 10.1073/pnas.81.5.1327
    tissue_or_cell_type
    Acetaminophen reactive-metabolite handling

    Glutathione: metabolism, signaling and nutrient connections (2026-09-17) · lines 1035–1046

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Enzyme oxidation and radiolabeled binding assays · source_derived_draft · unverified_draft

    ### glutathione-napqi-conjugation Adding GSH decreased covalent microsomal protein binding while forming 3-S-glutathionylacetaminophen. Condition category: normal nutrient_topic: Glutathione research collection; topical membership is not evidence of a direct dietary effect. plain_language: Glutathione diverted the reactive metabolite into a conjugate. organism: Mouse microsomes and cell-free cytochrome-P450 system tissue_or_cell_type: Acetaminophen reactive-metabolite handling experimental_model: Enzyme oxidation and radiolabeled binding assays limitations: Experimental chemistry; no new human dose threshold or treatment regimen is inferred. exposure: NAPQI or acetaminophen with reductants evidence_span: {"source_cache": "artifacts/glutathione-research/6424115.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "8c45563e89388d200eb64ae63d12b388ef5cca91369a585157ef27b39f525b08", "start_char": 0, "end_char": 1307, "text_sha256": "8c45563e89388d200eb64ae63d12b388ef5cca91369a585157ef27b39f525b08"} [glutathione-p6424115] N-acetyl-p-benzoquinone imine: a cytochrome P-450-mediated oxidation product of acetaminophen. (1984). https://pubmed.ncbi.nlm.nih.gov/6424115/ DOI: 10.1073/pnas.81.5.1327
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. After intraperitoneal acetaminophen, tissue glutathione was reduced more in mice than in rats and more in liver than in kidney without appearance of oxidized glutathione in either tissue, covalent binding of tritiated metabolites to tissue protein was likewise greater in mice than rats and greater in liver than kidney, prior 3-methylcholanthrene produced far greater induced changes in liver than kidney suggesting the reactive metabolite forms by slightly different mechanisms in each organ, and at doses below those causing demonstrable acute toxicity the duration of covalent binding was longer for renal papilla than for renal cortex or liver.

    Paracetamol → Tissue reduced glutathione content source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/paracetamol-research/660552.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "7041ada7ee2ce923645d1103db3a3dccc3febcf138c5095e24aa96cdbc04e9e3", "start_char": 0, "end_char": 1309, "text_sha256": "7041ada7ee2ce923645d1103db3a3dccc3febcf138c5095e24aa96cdbc04e9e3"}
    experimental_model
    Tissue glutathione and covalent binding of tritiated metabolites in CD-1 mice and Sprague-Dawley rats
    exposure
    Intraperitoneal acetaminophen, with and without prior 3-methylcholanthrene induction
    limitations
    Compares two organs and two species in the same design. The authors note the covalent binding measurement is extremely sensitive to trace radiochemical impurity, which is an honest caution about the method.
    nutrient_topic
    Paracetamol research collection; topical membership is not evidence of a direct clinical effect, and the drug is recorded separately from the metabolites NAPQI and AM404. · Paracetamol
    organism
    Mouse and rat
    plain_language
    The drug empties the cell of its protective thiol and then sticks to proteins, most of all in mouse liver.
    primary_references
    [apap-p660552] Covalent binding of metabolites of acetaminophen to kidney protein and depletion of renal glutathione. (1978). https://pubmed.ncbi.nlm.nih.gov/660552/ DOI: 10.1016/s0022-3565(25)31316-9
    tissue_or_cell_type
    Liver, kidney cortex and renal papilla

    Paracetamol: the enzyme it reduces rather than blocks, the isoform that turned out not to exist, the metabolite that carries the analgesia, and the metabolite that destroys the liver (2026-09-22) · lines 402–413

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Tissue glutathione and covalent binding of tritiated metabolites in CD-1 mice and Sprague-Dawley rats · source_derived_draft · unverified_draft

    ### apap-binding-tracks-glutathione-loss After intraperitoneal acetaminophen, tissue glutathione was reduced more in mice than in rats and more in liver than in kidney without appearance of oxidized glutathione in either tissue, covalent binding of tritiated metabolites to tissue protein was likewise greater in mice than rats and greater in liver than kidney, prior 3-methylcholanthrene produced far greater induced changes in liver than kidney suggesting the reactive metabolite forms by slightly different mechanisms in each organ, and at doses below those causing demonstrable acute toxicity the duration of covalent binding was longer for renal papilla than for renal cortex or liver. Condition category: normal nutrient_topic: Paracetamol research collection; topical membership is not evidence of a direct clinical effect, and the drug is recorded separately from the metabolites NAPQI and AM404. plain_language: The drug empties the cell of its protective thiol and then sticks to proteins, most of all in mouse liver. organism: Mouse and rat tissue_or_cell_type: Liver, kidney cortex and renal papilla experimental_model: Tissue glutathione and covalent binding of tritiated metabolites in CD-1 mice and Sprague-Dawley rats limitations: Compares two organs and two species in the same design. The authors note the covalent binding measurement is extremely sensitive to trace radiochemical impurity, which is an honest caution about the method. exposure: Intraperitoneal acetaminophen, with and without prior 3-methylcholanthrene induction evidence_span: {"source_cache": "artifacts/paracetamol-research/660552.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "7041ada7ee2ce923645d1103db3a3dccc3febcf138c5095e24aa96cdbc04e9e3", "start_char": 0, "end_char": 1309, "text_sha256": "7041ada7ee2ce923645d1103db3a3dccc3febcf138c5095e24aa96cdbc04e9e3"} [apap-p660552] Covalent binding of metabolites of acetaminophen to kidney protein and depletion of renal glutathione. (1978). https://pubmed.ncbi.nlm.nih.gov/660552/ DOI: 10.1016/s0022-3565(25)31316-9
    Complete structured claim and evidence

  2. Leflunomide given 4 hours after a hepatotoxic dose of acetaminophen afforded significant protection from liver necrosis by serum alanine aminotransferase and histopathology at 8 and 24 hours, and the mechanism was not inhibition of cytochrome-P450-catalysed bioactivation or suppression of innate immunity but inhibition of acetaminophen-induced phosphorylation of c-Jun N-terminal protein kinase, preventing downstream Bcl-2 and Bcl-XL inactivation and protecting from mitochondrial permeabilization and cytochrome c release, while also preventing induction of inducible nitric oxide synthase and formation of peroxynitrite; protection was still obtained when given 8 hours after the dose.

    c-Jun N-terminal kinase → Hepatic necrosis source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    biomarker_context Imported condition classification; unverified.
    evidence_span
    {"source_cache": "artifacts/paracetamol-research/17366662.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "7c7eb70728aa75fa3ac54f70703ce08d7a540b3a2a7da7e4797f27a6b1312dbb", "start_char": 0, "end_char": 1791, "text_sha256": "7c7eb70728aa75fa3ac54f70703ce08d7a540b3a2a7da7e4797f27a6b1312dbb"}
    experimental_model
    Male C57BL/6 mice given a hepatotoxic dose followed by leflunomide at 4 or 8 hours
    exposure
    750 milligrams per kilogram acetaminophen intraperitoneally, rescued with 30 milligrams per kilogram leflunomide
    limitations
    A rescue given hours after the dose, which separates the injury pathway from the bioactivation step. A mouse model at a dose far above therapeutic.
    nutrient_topic
    Paracetamol research collection; topical membership is not evidence of a direct clinical effect, and the drug is recorded separately from the metabolites NAPQI and AM404. · Paracetamol
    organism
    Mouse
    plain_language
    The damage is done by a signalling kinase hours later, not by the chemistry of the metabolite alone, which is why a late rescue works.
    primary_references
    [apap-p17366662] Mitochondrial protection by the JNK inhibitor leflunomide rescues mice from acetaminophen-induced liver injury. (2007). https://pubmed.ncbi.nlm.nih.gov/17366662/ DOI: 10.1002/hep.21475
    tissue_or_cell_type
    Liver
    trigger_kind
    biomarker_context Imported condition classification; unverified.

    Paracetamol: the enzyme it reduces rather than blocks, the isoform that turned out not to exist, the metabolite that carries the analgesia, and the metabolite that destroys the liver (2026-09-22) · lines 415–426

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Male C57BL/6 mice given a hepatotoxic dose followed by leflunomide at 4 or 8 hours · source_derived_draft · unverified_draft

    ### apap-jnk-not-bioactivation Leflunomide given 4 hours after a hepatotoxic dose of acetaminophen afforded significant protection from liver necrosis by serum alanine aminotransferase and histopathology at 8 and 24 hours, and the mechanism was not inhibition of cytochrome-P450-catalysed bioactivation or suppression of innate immunity but inhibition of acetaminophen-induced phosphorylation of c-Jun N-terminal protein kinase, preventing downstream Bcl-2 and Bcl-XL inactivation and protecting from mitochondrial permeabilization and cytochrome c release, while also preventing induction of inducible nitric oxide synthase and formation of peroxynitrite; protection was still obtained when given 8 hours after the dose. Condition category: biomarker_context nutrient_topic: Paracetamol research collection; topical membership is not evidence of a direct clinical effect, and the drug is recorded separately from the metabolites NAPQI and AM404. plain_language: The damage is done by a signalling kinase hours later, not by the chemistry of the metabolite alone, which is why a late rescue works. organism: Mouse tissue_or_cell_type: Liver experimental_model: Male C57BL/6 mice given a hepatotoxic dose followed by leflunomide at 4 or 8 hours limitations: A rescue given hours after the dose, which separates the injury pathway from the bioactivation step. A mouse model at a dose far above therapeutic. exposure: 750 milligrams per kilogram acetaminophen intraperitoneally, rescued with 30 milligrams per kilogram leflunomide evidence_span: {"source_cache": "artifacts/paracetamol-research/17366662.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "7c7eb70728aa75fa3ac54f70703ce08d7a540b3a2a7da7e4797f27a6b1312dbb", "start_char": 0, "end_char": 1791, "text_sha256": "7c7eb70728aa75fa3ac54f70703ce08d7a540b3a2a7da7e4797f27a6b1312dbb"} [apap-p17366662] Mitochondrial protection by the JNK inhibitor leflunomide rescues mice from acetaminophen-induced liver injury. (2007). https://pubmed.ncbi.nlm.nih.gov/17366662/ DOI: 10.1002/hep.21475
    Complete structured claim and evidence

  3. Acetaminophen overdose is the leading cause of acute liver failure in Canada and around the world with approximately 4,500 hospitalisations each year in Canada and about 6% of those hospitalised developing liver injury including acute liver failure that may require transplant or lead to death, and on the Rumack-Matthew nomogram derived from patients not treated with antidote a serum concentration above 200 milligrams per litre at 4 hours carries a 60% incidence of severe hepatotoxicity and 5% mortality rising to 90% and 24% at 300 milligrams per litre, with treatment by N-acetylcysteine required above 140 milligrams per litre at 4 hours.

    Paracetamol → Acute liver failure source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    biomarker_context Imported condition classification; unverified.
    evidence_span
    {"source_cache": "artifacts/paracetamol-research/36191122.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "859db1958aeb26b75a34a32e4dd1c4713dc7db413717cefe62a3659856db7568", "start_char": 0, "end_char": 3325, "text_sha256": "859db1958aeb26b75a34a32e4dd1c4713dc7db413717cefe62a3659856db7568"}
    experimental_model
    Review of point-of-care testing and antidote guidance for acute overdose
    exposure
    Serum acetaminophen concentration interpreted against the Rumack-Matthew nomogram
    limitations
    A health-technology review rather than primary research. The nomogram figures it quotes are derived from patients not treated with antidote, which is stated.
    nutrient_topic
    Paracetamol research collection; topical membership is not evidence of a direct clinical effect, and the drug is recorded separately from the metabolites NAPQI and AM404. · Paracetamol
    organism
    Human
    plain_language
    Above a concentration that can be read off a chart, the liver fails in most people unless the antidote is given.
    primary_references
    [apap-p36191122] Point-of-Care Testing and N-Acetylcysteine for Acute Acetaminophen Overdose (2021). https://pubmed.ncbi.nlm.nih.gov/36191122/
    tissue_or_cell_type
    Liver
    trigger_kind
    biomarker_context Imported condition classification; unverified.

    Paracetamol: the enzyme it reduces rather than blocks, the isoform that turned out not to exist, the metabolite that carries the analgesia, and the metabolite that destroys the liver (2026-09-22) · lines 428–439

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Review of point-of-care testing and antidote guidance for acute overdose · source_derived_draft · unverified_draft

    ### apap-the-nomogram-and-the-antidote Acetaminophen overdose is the leading cause of acute liver failure in Canada and around the world with approximately 4,500 hospitalisations each year in Canada and about 6% of those hospitalised developing liver injury including acute liver failure that may require transplant or lead to death, and on the Rumack-Matthew nomogram derived from patients not treated with antidote a serum concentration above 200 milligrams per litre at 4 hours carries a 60% incidence of severe hepatotoxicity and 5% mortality rising to 90% and 24% at 300 milligrams per litre, with treatment by N-acetylcysteine required above 140 milligrams per litre at 4 hours. Condition category: biomarker_context nutrient_topic: Paracetamol research collection; topical membership is not evidence of a direct clinical effect, and the drug is recorded separately from the metabolites NAPQI and AM404. plain_language: Above a concentration that can be read off a chart, the liver fails in most people unless the antidote is given. organism: Human tissue_or_cell_type: Liver experimental_model: Review of point-of-care testing and antidote guidance for acute overdose limitations: A health-technology review rather than primary research. The nomogram figures it quotes are derived from patients not treated with antidote, which is stated. exposure: Serum acetaminophen concentration interpreted against the Rumack-Matthew nomogram evidence_span: {"source_cache": "artifacts/paracetamol-research/36191122.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "859db1958aeb26b75a34a32e4dd1c4713dc7db413717cefe62a3659856db7568", "start_char": 0, "end_char": 3325, "text_sha256": "859db1958aeb26b75a34a32e4dd1c4713dc7db413717cefe62a3659856db7568"} [apap-p36191122] Point-of-Care Testing and N-Acetylcysteine for Acute Acetaminophen Overdose (2021). https://pubmed.ncbi.nlm.nih.gov/36191122/
    Complete structured claim and evidence

In the sources

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    This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

    Evidence, AI assistance and curation standards