Component

Hepatocyte

Hepatocyte. Species, exposure and limitations are retained in each linked claim.

3 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

Where it participates (unsigned role)

  1. Ibuprofen epimerization in humans is virtually irreversible from R to S, and 2-arylpropionyl-CoA epimerase readily converts R-ibuprofen-CoA into its S counterpart in active subcellular hepatic preparations, with examination of epimerase activity across tissues indicating that this metabolism occurs mainly in liver and kidney; reduced renal clearance together with metabolic bioactivation from inversion may raise plasma levels of the active species unpredictably.

    2-arylpropionyl-CoA epimerase → R-ibuprofenoyl-coenzyme A thioester source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/ibuprofen-research/1680979.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "4888135fd1db1817c370825ee8a1435b7654e68af33912093c725fe7041341cc", "start_char": 0, "end_char": 1119, "text_sha256": "4888135fd1db1817c370825ee8a1435b7654e68af33912093c725fe7041341cc"}
    experimental_model
    Enantioselective high performance liquid chromatography in humans with active subcellular hepatic preparations from rats
    exposure
    Racemic and single-enantiomer ibuprofen, with R-ibuprofen-CoA applied to subcellular fractions
    limitations
    Establishes the epimerase step directly on the thioester. The tissue survey is in rat; the human arm is the demonstration that inversion is one-way.
    nutrient_topic
    Ibuprofen research collection; topical membership is not evidence of a direct clinical effect, and the racemate is recorded separately from each of its two enantiomers. · Ibuprofen
    organism
    Human and rat
    plain_language
    An enzyme flips the activated form from one hand to the other, mostly in the liver and kidney.
    primary_references
    [ibu-p1680979] Metabolic inversion of stereoisomeric ibuprofen in man. (1991). https://pubmed.ncbi.nlm.nih.gov/1680979/
    tissue_or_cell_type
    Liver and kidney

    Ibuprofen: the enantiomer that works, the one that was called inactive, the one-way chemistry that turns one into the other, and the targets that are not cyclooxygenase (2026-09-22) · lines 97–108

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Enantioselective high performance liquid chromatography in humans with active subcellular hepatic preparations from rats · source_derived_draft · unverified_draft

    ### ibu-epimerase-acts-on-the-thioester Ibuprofen epimerization in humans is virtually irreversible from R to S, and 2-arylpropionyl-CoA epimerase readily converts R-ibuprofen-CoA into its S counterpart in active subcellular hepatic preparations, with examination of epimerase activity across tissues indicating that this metabolism occurs mainly in liver and kidney; reduced renal clearance together with metabolic bioactivation from inversion may raise plasma levels of the active species unpredictably. Condition category: normal nutrient_topic: Ibuprofen research collection; topical membership is not evidence of a direct clinical effect, and the racemate is recorded separately from each of its two enantiomers. plain_language: An enzyme flips the activated form from one hand to the other, mostly in the liver and kidney. organism: Human and rat tissue_or_cell_type: Liver and kidney experimental_model: Enantioselective high performance liquid chromatography in humans with active subcellular hepatic preparations from rats limitations: Establishes the epimerase step directly on the thioester. The tissue survey is in rat; the human arm is the demonstration that inversion is one-way. exposure: Racemic and single-enantiomer ibuprofen, with R-ibuprofen-CoA applied to subcellular fractions evidence_span: {"source_cache": "artifacts/ibuprofen-research/1680979.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "4888135fd1db1817c370825ee8a1435b7654e68af33912093c725fe7041341cc", "start_char": 0, "end_char": 1119, "text_sha256": "4888135fd1db1817c370825ee8a1435b7654e68af33912093c725fe7041341cc"} [ibu-p1680979] Metabolic inversion of stereoisomeric ibuprofen in man. (1991). https://pubmed.ncbi.nlm.nih.gov/1680979/
    Complete structured claim and evidence

  2. In rat isolated adipocytes and hepatocytes incubated with tritiated glycerol there was a high-affinity enzymatic process for synthesis of triacylglycerol containing fenoprofen which was stereospecific for the R enantiomer, with apparent Km values of 1.0 micromolar in adipocytes and 2.8 micromolar in hepatocytes, consistent with stereospecific formation of R-2-arylpropionyl-CoA thioesters at clinically relevant unbound concentrations; a second low-affinity process in hepatocytes occurred at concentrations far above those found in man at usual doses.

    R-ibuprofenoyl-coenzyme A thioester → Triacylglycerol carrying a 2-arylpropionic acid in place of a fatty acid source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/ibuprofen-research/3377800.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "facf726355f08978d9f447e3cfbd803611011abed9f95b46970540d246ea11e6", "start_char": 0, "end_char": 962, "text_sha256": "facf726355f08978d9f447e3cfbd803611011abed9f95b46970540d246ea11e6"}
    experimental_model
    Rat isolated adipocytes and hepatocytes incubated with tritiated glycerol and single enantiomers of fenoprofen
    exposure
    R or S fenoprofen at concentrations spanning the clinically relevant unbound range
    limitations
    Tested with fenoprofen rather than ibuprofen, which is recorded on the claim. It shows where the activated R thioester can end up when it is not epimerised.
    nutrient_topic
    Ibuprofen research collection; topical membership is not evidence of a direct clinical effect, and the racemate is recorded separately from each of its two enantiomers. · Ibuprofen
    organism
    Rat
    plain_language
    The activated R form can be built into body fat as a fake fatty acid, at concentrations people actually reach.
    primary_references
    [ibu-p3377800] The stereospecific incorporation of fenoprofen into rat hepatocyte and adipocyte triacylglycerols. (1988). https://pubmed.ncbi.nlm.nih.gov/3377800/ DOI: 10.1016/0006-2952(88)90537-0
    tissue_or_cell_type
    Adipocytes and hepatocytes

    Ibuprofen: the enantiomer that works, the one that was called inactive, the one-way chemistry that turns one into the other, and the targets that are not cyclooxygenase (2026-09-22) · lines 175–186

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Rat isolated adipocytes and hepatocytes incubated with tritiated glycerol and single enantiomers of fenoprofen · source_derived_draft · unverified_draft

    ### ibu-r-enantiomer-enters-body-fat In rat isolated adipocytes and hepatocytes incubated with tritiated glycerol there was a high-affinity enzymatic process for synthesis of triacylglycerol containing fenoprofen which was stereospecific for the R enantiomer, with apparent Km values of 1.0 micromolar in adipocytes and 2.8 micromolar in hepatocytes, consistent with stereospecific formation of R-2-arylpropionyl-CoA thioesters at clinically relevant unbound concentrations; a second low-affinity process in hepatocytes occurred at concentrations far above those found in man at usual doses. Condition category: normal nutrient_topic: Ibuprofen research collection; topical membership is not evidence of a direct clinical effect, and the racemate is recorded separately from each of its two enantiomers. plain_language: The activated R form can be built into body fat as a fake fatty acid, at concentrations people actually reach. organism: Rat tissue_or_cell_type: Adipocytes and hepatocytes experimental_model: Rat isolated adipocytes and hepatocytes incubated with tritiated glycerol and single enantiomers of fenoprofen limitations: Tested with fenoprofen rather than ibuprofen, which is recorded on the claim. It shows where the activated R thioester can end up when it is not epimerised. exposure: R or S fenoprofen at concentrations spanning the clinically relevant unbound range evidence_span: {"source_cache": "artifacts/ibuprofen-research/3377800.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "facf726355f08978d9f447e3cfbd803611011abed9f95b46970540d246ea11e6", "start_char": 0, "end_char": 962, "text_sha256": "facf726355f08978d9f447e3cfbd803611011abed9f95b46970540d246ea11e6"} [ibu-p3377800] The stereospecific incorporation of fenoprofen into rat hepatocyte and adipocyte triacylglycerols. (1988). https://pubmed.ncbi.nlm.nih.gov/3377800/ DOI: 10.1016/0006-2952(88)90537-0
    Complete structured claim and evidence

  3. 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

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

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

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