Dopamine

experimental_model

Human DDC expressed in monkey COS cells; enzyme assays

exposure

PLP addition to transfected COS-cell enzyme incubations.

limitations

An expression-system response is not proof that supplements increase brain monoamines.

nutrient_topic

Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin B6

organism

Human DDC expressed in monkey COS cells

plain_language

B6 cofactor supports this monoamine-producing step.

primary_references

[sumi-1990-ddc] Characterization of recombinant human aromatic L-amino acid decarboxylase expressed in COS cells (1990). https://doi.org/10.1111/j.1471-4159.1990.tb04601.x DOI: 10.1111/j.1471-4159.1990.tb04601.x

tissue_or_cell_type

COS-cell expression system

Vitamin B6: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 999–1009

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human DDC expressed in monkey COS cells; enzyme assays · source_derived_draft · unverified_draft

### b6-neuro-ddc-dopamine Expressed human DDC decarboxylated L-DOPA; added PLP enhanced the measured activity. Condition category: normal nutrient_topic: Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. plain_language: B6 cofactor supports this monoamine-producing step. organism: Human DDC expressed in monkey COS cells tissue_or_cell_type: COS-cell expression system experimental_model: Human DDC expressed in monkey COS cells; enzyme assays limitations: An expression-system response is not proof that supplements increase brain monoamines. exposure: PLP addition to transfected COS-cell enzyme incubations. [sumi-1990-ddc] Characterization of recombinant human aromatic L-amino acid decarboxylase expressed in COS cells (1990). https://doi.org/10.1111/j.1471-4159.1990.tb04601.x DOI: 10.1111/j.1471-4159.1990.tb04601.x

evidence_span

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experimental_model

Human DBH X-ray crystallography

exposure

Crystal structure at 2.9 angstrom resolution

limitations

Open and closed conformations were observed; the proposed catalytic alternation and fully occupied binuclear states require further evidence. Do not equate a structural model with proof of psychiatric effects from copper intake.

nutrient_topic

Copper research collection; topical membership is not evidence of a direct dietary effect. · Copper

organism

Human protein

plain_language

Copper is part of the enzyme that converts one neurotransmitter into another.

primary_references

[copper-p27152332] The crystal structure of human dopamine β-hydroxylase at 2.9 Å resolution. (2016). https://pubmed.ncbi.nlm.nih.gov/27152332/ DOI: 10.1126/sciadv.1500980

tissue_or_cell_type

Purified dimeric enzyme

Copper: transport, cuproenzymes, deficiency, excess and nutrient interactions (2026-09-17) · lines 1079–1090

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human DBH X-ray crystallography · source_derived_draft · unverified_draft

### copper-dbh-neurotransmitter-step Human DBH is the copper-enzyme step converting dopamine to norepinephrine; the study resolved its catalytic-core architecture. Condition category: normal nutrient_topic: Copper research collection; topical membership is not evidence of a direct dietary effect. plain_language: Copper is part of the enzyme that converts one neurotransmitter into another. organism: Human protein tissue_or_cell_type: Purified dimeric enzyme experimental_model: Human DBH X-ray crystallography limitations: Open and closed conformations were observed; the proposed catalytic alternation and fully occupied binuclear states require further evidence. Do not equate a structural model with proof of psychiatric effects from copper intake. exposure: Crystal structure at 2.9 angstrom resolution evidence_span: {"source_cache": "artifacts/copper-research/27152332.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "984a9036d5157e29cdef55d42201887d3ff43cf533185148ba4e3f5c143ced09", "start_char": 0, "end_char": 1325, "text_sha256": "984a9036d5157e29cdef55d42201887d3ff43cf533185148ba4e3f5c143ced09"} [copper-p27152332] The crystal structure of human dopamine β-hydroxylase at 2.9 Å resolution. (2016). https://pubmed.ncbi.nlm.nih.gov/27152332/ DOI: 10.1126/sciadv.1500980

evidence_access

Primary abstract

experimental_model

Bacterial enzyme experiments, human PD associations and proximal-intestinal rat studies.

limitations

Patient abundance associations and rat plasma effects are not proof that changing dietary tyrosine improves levodopa response.

nutrient_topic

L-Tyrosine collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Tyrosine

plain_language

Blocking the human enzyme may leave a microbial route active.

primary_references

Gut bacterial tyrosine decarboxylases restrict levels of levodopa in the treatment of Parkinson's disease. · 2019 · https://pubmed.ncbi.nlm.nih.gov/30659181/ · DOI 10.1038/s41467-019-08294-y

L-Tyrosine: catecholamines, thyroid chemistry, pigment, metabolism and cross-nutrient mechanisms (2026-09-19) · lines 340–346

AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Bacterial enzyme experiments, human PD associations and proximal-intestinal rat studies. · source_derived_draft · unverified_draft

## l-tyrosine-bacterial-drug Blocking the human enzyme may leave a microbial route active. Bacterial tyrosine decarboxylases converted levodopa to dopamine despite competing tyrosine or human decarboxylase inhibitors. Model: Bacterial enzyme experiments, human PD associations and proximal-intestinal rat studies. Limitations: Patient abundance associations and rat plasma effects are not proof that changing dietary tyrosine improves levodopa response. Evidence access: Primary abstract Gut bacterial tyrosine decarboxylases restrict levels of levodopa in the treatment of Parkinson's disease. · 2019 · https://pubmed.ncbi.nlm.nih.gov/30659181/ · DOI 10.1038/s41467-019-08294-y

availability_state

nutrient_deficiency Imported condition classification; unverified.

evidence_access

Primary abstract

experimental_model

Fast-scan cyclic voltammetry in a separate rat group from the tissue-content experiment.

limitations

The release endpoint is not a direct human measurement; the corrected norepinephrine endpoint is excluded. Correction record: The 2018 correction (PMID 30094500) reports an error in norepinephrine standard concentrations used for HPLC calibration. The correction abstract was inspected, but full notice content was unavailable; its complete quantitative scope remains unverified. This collection uses the tyrosine depletion and dopamine-transient findings and does not reuse the original norepinephrine concentration result. https://pubmed.ncbi.nlm.nih.gov/30094500/

nutrient_topic

L-Tyrosine collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Tyrosine

plain_language

Less precursor can change release dynamics without simply emptying all dopamine stores.

primary_references

Acute phenylalanine/tyrosine depletion of phasic dopamine in the rat brain. · 2016 · https://pubmed.ncbi.nlm.nih.gov/26944052/ · DOI 10.1007/s00213-016-4259-0

trigger_kind

nutrient_deficiency Imported condition classification; unverified.

L-Tyrosine: catecholamines, thyroid chemistry, pigment, metabolism and cross-nutrient mechanisms (2026-09-19) · lines 388–394

AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Fast-scan cyclic voltammetry in a separate rat group from the tissue-content experiment. · source_derived_draft · unverified_draft

## l-tyrosine-rat-dopamine-transients Less precursor can change release dynamics without simply emptying all dopamine stores. Combined phenylalanine/tyrosine depletion decreased dopamine-transient frequency without decreasing transient amplitude in freely moving rats. Model: Fast-scan cyclic voltammetry in a separate rat group from the tissue-content experiment. Limitations: The release endpoint is not a direct human measurement; the corrected norepinephrine endpoint is excluded. Correction record: The 2018 correction (PMID 30094500) reports an error in norepinephrine standard concentrations used for HPLC calibration. The correction abstract was inspected, but full notice content was unavailable; its complete quantitative scope remains unverified. This collection uses the tyrosine depletion and dopamine-transient findings and does not reuse the original norepinephrine concentration result. https://pubmed.ncbi.nlm.nih.gov/30094500/ Evidence access: Primary abstract Acute phenylalanine/tyrosine depletion of phasic dopamine in the rat brain. · 2016 · https://pubmed.ncbi.nlm.nih.gov/26944052/ · DOI 10.1007/s00213-016-4259-0

dose

Tartrazine in an additive-inhibition panel; concentration and substrate amounts not in abstract

duration

Assay interval not specified in accessed abstract

evidence_access

Primary PubMed abstract; unrecovered method details explicitly retained.

evidence_scope

literature_reviewed; source-specific experimental curation

experimental_model

Human liver cytosolic preparations

limitations

A functional sulfation assay does not demonstrate direct SULT1A3 binding or altered human brain dopamine. Ethinyloestradiol findings for other additives are not transferred to tartrazine.

nutrient_topic

Tartrazine food-colorant chapter; nutrient, drug and peptide interactions retain their models and limits. · Tartrazine

organism

Human liver cytosolic preparations

plain_language

Tartrazine inhibited dopamine sulfation in human liver cytosol.

primary_references

Common food additives are potent inhibitors of human liver 17 alpha-ethinyloestradiol and dopamine sulphotransferases. (1993). https://pubmed.ncbi.nlm.nih.gov/8250957/ DOI: 10.1016/0006-2952(93)90575-h

route

In vitro cytosolic enzyme assay

tissue

Dopamine sulfation

Tartrazine: mechanisms, molecular forms and cross-actor connections (2026-09-20) · lines 259–268

Original AI-assisted curation of eighteen primary studies. Study-specific citations, negative findings and limitations retained. Not publisher full text. · supports · Human liver cytosolic preparations · source_derived_draft · unverified_draft

## tartrazine-dopamine-sulfation Tartrazine inhibited dopamine sulfation in human liver cytosol. Model/species: Human liver cytosolic preparations Tissue: Dopamine sulfation Exposure: Tartrazine in an additive-inhibition panel; concentration and substrate amounts not in abstract Route: In vitro cytosolic enzyme assay Duration: Assay interval not specified in accessed abstract Limits: A functional sulfation assay does not demonstrate direct SULT1A3 binding or altered human brain dopamine. Ethinyloestradiol findings for other additives are not transferred to tartrazine. Primary reference: Common food additives are potent inhibitors of human liver 17 alpha-ethinyloestradiol and dopamine sulphotransferases. (1993). https://pubmed.ncbi.nlm.nih.gov/8250957/ DOI: 10.1016/0006-2952(93)90575-h Access: Primary PubMed abstract; unrecovered method details explicitly retained.

evidence_span

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experimental_model

Cell-free oxidation and cultured-cell injury assays

exposure

Dopamine with and without copper; theanine concentration-ratio experiments

limitations

High experimental substrate ratios; no human copper-depletion, Parkinson disease treatment or systemic chelation conclusion. Cellular protection does not establish effective brain exposure.

nutrient_topic

L-Theanine research collection; topical membership is not evidence of a direct dietary effect. · L-Theanine

organism

Human SH-SY5Y cell line and chemical systems

plain_language

Cell survival was measured separately from the chemical oxidation assay.

primary_references

[theanine-p39499422] L-Theanine Effectively Protects Against Copper-Facilitated Dopamine Oxidation: Implication for Relieving Dopamine Overflow-Associated Neurotoxicities. (2025). https://pubmed.ncbi.nlm.nih.gov/39499422/ DOI: 10.1007/s12035-024-04601-x

tissue_or_cell_type

Copper-facilitated dopamine oxidation

L-Theanine: metabolism, neural signaling, nutrient connections and human outcomes (2026-09-17) · lines 744–755

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Cell-free oxidation and cultured-cell injury assays · source_derived_draft · unverified_draft

### theanine-copper-cell-protection Theanine protected SH-SY5Y cells against the injury produced by dopamine plus copper. Condition category: normal nutrient_topic: L-Theanine research collection; topical membership is not evidence of a direct dietary effect. plain_language: Cell survival was measured separately from the chemical oxidation assay. organism: Human SH-SY5Y cell line and chemical systems tissue_or_cell_type: Copper-facilitated dopamine oxidation experimental_model: Cell-free oxidation and cultured-cell injury assays limitations: High experimental substrate ratios; no human copper-depletion, Parkinson disease treatment or systemic chelation conclusion. Cellular protection does not establish effective brain exposure. exposure: Dopamine with and without copper; theanine concentration-ratio experiments evidence_span: {"source_cache": "artifacts/theanine-research/39499422.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "abb7a869056bc8c43d6792b2a4ff9a1b15738facf454daeb3f92df383932b9c4", "start_char": 0, "end_char": 1871, "text_sha256": "abb7a869056bc8c43d6792b2a4ff9a1b15738facf454daeb3f92df383932b9c4"} [theanine-p39499422] L-Theanine Effectively Protects Against Copper-Facilitated Dopamine Oxidation: Implication for Relieving Dopamine Overflow-Associated Neurotoxicities. (2025). https://pubmed.ncbi.nlm.nih.gov/39499422/ DOI: 10.1007/s12035-024-04601-x

evidence_span

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experimental_model

Cell-free oxidation and cultured-cell injury assays

exposure

Dopamine with and without copper; theanine concentration-ratio experiments

limitations

High experimental substrate ratios; no human copper-depletion, Parkinson disease treatment or systemic chelation conclusion. Cellular protection does not establish effective brain exposure.

nutrient_topic

L-Theanine research collection; topical membership is not evidence of a direct dietary effect. · L-Theanine

organism

Human SH-SY5Y cell line and chemical systems

plain_language

Copper changed the chemistry of dopamine oxidation, and theanine interfered with that chemistry in the assay.

primary_references

[theanine-p39499422] L-Theanine Effectively Protects Against Copper-Facilitated Dopamine Oxidation: Implication for Relieving Dopamine Overflow-Associated Neurotoxicities. (2025). https://pubmed.ncbi.nlm.nih.gov/39499422/ DOI: 10.1007/s12035-024-04601-x

tissue_or_cell_type

Copper-facilitated dopamine oxidation

L-Theanine: metabolism, neural signaling, nutrient connections and human outcomes (2026-09-17) · lines 731–742

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Cell-free oxidation and cultured-cell injury assays · source_derived_draft · unverified_draft

### theanine-copper-dopamine-oxidation Theanine suppressed copper-facilitated dopamine oxidation; the authors attributed this to copper chelation. Condition category: normal nutrient_topic: L-Theanine research collection; topical membership is not evidence of a direct dietary effect. plain_language: Copper changed the chemistry of dopamine oxidation, and theanine interfered with that chemistry in the assay. organism: Human SH-SY5Y cell line and chemical systems tissue_or_cell_type: Copper-facilitated dopamine oxidation experimental_model: Cell-free oxidation and cultured-cell injury assays limitations: High experimental substrate ratios; no human copper-depletion, Parkinson disease treatment or systemic chelation conclusion. Cellular protection does not establish effective brain exposure. exposure: Dopamine with and without copper; theanine concentration-ratio experiments evidence_span: {"source_cache": "artifacts/theanine-research/39499422.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "abb7a869056bc8c43d6792b2a4ff9a1b15738facf454daeb3f92df383932b9c4", "start_char": 0, "end_char": 1871, "text_sha256": "abb7a869056bc8c43d6792b2a4ff9a1b15738facf454daeb3f92df383932b9c4"} [theanine-p39499422] L-Theanine Effectively Protects Against Copper-Facilitated Dopamine Oxidation: Implication for Relieving Dopamine Overflow-Associated Neurotoxicities. (2025). https://pubmed.ncbi.nlm.nih.gov/39499422/ DOI: 10.1007/s12035-024-04601-x

evidence_span

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experimental_model

In-vivo striatal microdialysis with receptor antagonists

exposure

Local brain theanine administration; glycine and AMPA antagonists

limitations

Direct brain dosing bypasses oral absorption and blood-brain-barrier transport. Antagonist sensitivity identifies pathway involvement, not necessarily direct theanine binding.

nutrient_topic

L-Theanine research collection; topical membership is not evidence of a direct dietary effect. · L-Theanine

organism

Conscious rats

plain_language

The glycine-receptor pathway participated in the dopamine response.

primary_references

[theanine-p18196445] Theanine, gamma-glutamylethylamide, a unique amino acid in tea leaves, modulates neurotransmitter concentrations in the brain striatum interstitium in conscious rats. (2009). https://pubmed.ncbi.nlm.nih.gov/18196445/ DOI: 10.1007/s00726-007-0020-7

tissue_or_cell_type

Striatal extracellular neurotransmitters

L-Theanine: metabolism, neural signaling, nutrient connections and human outcomes (2026-09-17) · lines 380–391

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · In-vivo striatal microdialysis with receptor antagonists · source_derived_draft · unverified_draft

### theanine-glycine-dopamine Strychnine reduced the theanine-induced dopamine response in rat striatum. Condition category: normal nutrient_topic: L-Theanine research collection; topical membership is not evidence of a direct dietary effect. plain_language: The glycine-receptor pathway participated in the dopamine response. organism: Conscious rats tissue_or_cell_type: Striatal extracellular neurotransmitters experimental_model: In-vivo striatal microdialysis with receptor antagonists limitations: Direct brain dosing bypasses oral absorption and blood-brain-barrier transport. Antagonist sensitivity identifies pathway involvement, not necessarily direct theanine binding. exposure: Local brain theanine administration; glycine and AMPA antagonists evidence_span: {"source_cache": "artifacts/theanine-research/18196445.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "59fdaf94d59c2f4b2981c29cd2981c043351aae1299a59a19e29979076957839", "start_char": 0, "end_char": 1118, "text_sha256": "59fdaf94d59c2f4b2981c29cd2981c043351aae1299a59a19e29979076957839"} [theanine-p18196445] Theanine, gamma-glutamylethylamide, a unique amino acid in tea leaves, modulates neurotransmitter concentrations in the brain striatum interstitium in conscious rats. (2009). https://pubmed.ncbi.nlm.nih.gov/18196445/ DOI: 10.1007/s00726-007-0020-7

evidence_span

{"source_cache": "artifacts/cold-research/3676254.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e929132eed0f1c94ab0bdbef6e31bca7ecbed222cf9b585e17a1cfae7e93c82a", "start_char": 0, "end_char": 1648, "text_sha256": "e929132eed0f1c94ab0bdbef6e31bca7ecbed222cf9b585e17a1cfae7e93c82a"}

experimental_model

Steady-state kinetics of dopamine beta-monooxygenase with structurally distinct reductants

exposure

Ascorbate, ferrocyanide or dopamine itself as the reducing agent, with deuterium isotope effects

limitations

A kinetic comparison identifying ascorbate as the presumed physiological reductant and locating a separate binding site for it. Truncated abstract; the reductant site is inferred from kinetics and modelling.

nutrient_topic

Cold water immersion research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. · Cold water immersion

organism

Bovine enzyme

plain_language

Vitamin C is what hands the enzyme back its electrons, and without it the reaction crawls.

primary_references

[cold-p3676254] Characterization of alternate reductant binding and electron transfer in the dopamine beta-monooxygenase reaction. (1987). https://pubmed.ncbi.nlm.nih.gov/3676254/ DOI: 10.1021/bi00391a013

tissue_or_cell_type

Purified enzyme

Cold water immersion: cold sensing, heat production, the catecholamine axis and what repeated exposure changes (2026-09-19) · lines 585–596

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Steady-state kinetics of dopamine beta-monooxygenase with structurally distinct reductants · source_derived_draft · unverified_draft

### cold-ascorbate-reductant Ascorbate is the presumed in vivo reductant of dopamine beta-monooxygenase; the one-electron reductant ferrocyanide was nearly as kinetically competent, while dopamine as sole reductant reduced enzymic copper in a rate-limiting step 40-fold slower than with ascorbate, and the reductant binds at a site physically distinct from the substrate site. Condition category: normal nutrient_topic: Cold water immersion research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. plain_language: Vitamin C is what hands the enzyme back its electrons, and without it the reaction crawls. organism: Bovine enzyme tissue_or_cell_type: Purified enzyme experimental_model: Steady-state kinetics of dopamine beta-monooxygenase with structurally distinct reductants limitations: A kinetic comparison identifying ascorbate as the presumed physiological reductant and locating a separate binding site for it. Truncated abstract; the reductant site is inferred from kinetics and modelling. exposure: Ascorbate, ferrocyanide or dopamine itself as the reducing agent, with deuterium isotope effects evidence_span: {"source_cache": "artifacts/cold-research/3676254.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e929132eed0f1c94ab0bdbef6e31bca7ecbed222cf9b585e17a1cfae7e93c82a", "start_char": 0, "end_char": 1648, "text_sha256": "e929132eed0f1c94ab0bdbef6e31bca7ecbed222cf9b585e17a1cfae7e93c82a"} [cold-p3676254] Characterization of alternate reductant binding and electron transfer in the dopamine beta-monooxygenase reaction. (1987). https://pubmed.ncbi.nlm.nih.gov/3676254/ DOI: 10.1021/bi00391a013

evidence_span

{"source_cache": "artifacts/cold-research/6323422.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "dac85ce0ad7c7d5994b97d55b129050a0e7ca8bf96943578d272054db6a07a62", "start_char": 0, "end_char": 1346, "text_sha256": "dac85ce0ad7c7d5994b97d55b129050a0e7ca8bf96943578d272054db6a07a62"}

experimental_model

Copper titration of bovine adrenal dopamine beta-hydroxylase followed by NMR, EPR and inhibitor kinetics

exposure

Titration with copper and measurement of catalytic rate

limitations

Stoichiometry measured three independent ways. It establishes how much copper the enzyme needs, not how much copper a person needs.

nutrient_topic

Cold water immersion research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. · Cold water immersion

organism

Bovine enzyme

plain_language

The enzyme that turns dopamine into noradrenaline needs exactly eight copper atoms to work fully.

primary_references

[cold-p6323422] Kinetic and spectroscopic studies of the interaction of copper with dopamine beta-hydroxylase. (1984). https://pubmed.ncbi.nlm.nih.gov/6323422/ DOI: 10.1016/s0021-9258(17)43105-x

tissue_or_cell_type

Adrenal medulla enzyme

Cold water immersion: cold sensing, heat production, the catecholamine axis and what repeated exposure changes (2026-09-19) · lines 559–570

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Copper titration of bovine adrenal dopamine beta-hydroxylase followed by NMR, EPR and inhibitor kinetics · source_derived_draft · unverified_draft

### cold-dbh-copper-stoichiometry Dopamine beta-hydroxylase specifically binds 8 moles of copper per mole of tetramer, confirmed by radiolabel, atomic absorption, NMR and EPR titration, and catalytic rate increased with copper up to that ratio and was constant thereafter, so this stoichiometry is required for maximal activity. Condition category: normal nutrient_topic: Cold water immersion research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. plain_language: The enzyme that turns dopamine into noradrenaline needs exactly eight copper atoms to work fully. organism: Bovine enzyme tissue_or_cell_type: Adrenal medulla enzyme experimental_model: Copper titration of bovine adrenal dopamine beta-hydroxylase followed by NMR, EPR and inhibitor kinetics limitations: Stoichiometry measured three independent ways. It establishes how much copper the enzyme needs, not how much copper a person needs. exposure: Titration with copper and measurement of catalytic rate evidence_span: {"source_cache": "artifacts/cold-research/6323422.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "dac85ce0ad7c7d5994b97d55b129050a0e7ca8bf96943578d272054db6a07a62", "start_char": 0, "end_char": 1346, "text_sha256": "dac85ce0ad7c7d5994b97d55b129050a0e7ca8bf96943578d272054db6a07a62"} [cold-p6323422] Kinetic and spectroscopic studies of the interaction of copper with dopamine beta-hydroxylase. (1984). https://pubmed.ncbi.nlm.nih.gov/6323422/ DOI: 10.1016/s0021-9258(17)43105-x

evidence_access

Primary full text

experimental_model

Rodent synaptic-vesicle acidification assays; glutamate compared with chloride.

limitations

The preparation does not show that glutamate supplements increase human dopamine.

nutrient_topic

L-Glutamate collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Glutamate

plain_language

One transmitter can influence storage of another through shared vesicle chemistry.

primary_references

Vesicular glutamate transport promotes dopamine storage and glutamate corelease in vivo. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20223200/ · DOI 10.1016/j.neuron.2010.02.012

L-Glutamate / L-glutamic acid: carbon and nitrogen allocation, signaling and cross-nutrient mechanisms (2026-09-19) · lines 314–320

AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Rodent synaptic-vesicle acidification assays; glutamate compared with chloride. · source_derived_draft · unverified_draft

## glutamate-glutamate-vesicle-acidification One transmitter can influence storage of another through shared vesicle chemistry. Glutamate co-entry increased vesicular acidification in the study, supporting the pH gradient used for monoamine storage. Model: Rodent synaptic-vesicle acidification assays; glutamate compared with chloride. Limitations: The preparation does not show that glutamate supplements increase human dopamine. Evidence access: Primary full text Vesicular glutamate transport promotes dopamine storage and glutamate corelease in vivo. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20223200/ · DOI 10.1016/j.neuron.2010.02.012

availability_state

machinery_impairment Imported condition classification; unverified.

evidence_access

Primary full text

experimental_model

Mouse conditional knockout with tissue dopamine and behavioral measurements.

limitations

Multiple downstream effects coexist; this does not prove every dopamine neuron or behavior depends equally on VGLUT2.

nutrient_topic

L-Glutamate collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Glutamate

plain_language

Removing the glutamate-loading route changed another transmitter system in a specific circuit.

primary_references

Vesicular glutamate transport promotes dopamine storage and glutamate corelease in vivo. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20223200/ · DOI 10.1016/j.neuron.2010.02.012

trigger_kind

machinery_impairment Imported condition classification; unverified.

L-Glutamate / L-glutamic acid: carbon and nitrogen allocation, signaling and cross-nutrient mechanisms (2026-09-19) · lines 322–328

AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Mouse conditional knockout with tissue dopamine and behavioral measurements. · source_derived_draft · unverified_draft

## glutamate-vglut2-dopamine-stores Removing the glutamate-loading route changed another transmitter system in a specific circuit. Dopamine-neuron Slc17a6 deletion reduced dopamine stores in ventral-striatal projections and reduced cocaine-stimulated locomotor responses while sparing baseline motor behavior. Model: Mouse conditional knockout with tissue dopamine and behavioral measurements. Limitations: Multiple downstream effects coexist; this does not prove every dopamine neuron or behavior depends equally on VGLUT2. Evidence access: Primary full text Vesicular glutamate transport promotes dopamine storage and glutamate corelease in vivo. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20223200/ · DOI 10.1016/j.neuron.2010.02.012

evidence_span

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experimental_model

In vivo microdialysis in freely moving rats

exposure

Ethanol administration with regional dopamine measurement

limitations

A reward-pathway measurement in freely moving animals. Dopamine release is a correlate of reinforcement, not a measure of liking or dependence.

nutrient_topic

Alcohol research collection; topical membership is not evidence of a direct clinical effect, and ethanol is recorded separately from the acetaldehyde it becomes. · Ethanol

organism

Rat

plain_language

Alcohol raises dopamine in the brain region that marks things as worth repeating.

primary_references

[alcohol-p3761194] Preferential stimulation of dopamine release in the nucleus accumbens of freely moving rats by ethanol. (1986). https://pubmed.ncbi.nlm.nih.gov/3761194/ DOI: 10.1016/s0022-3565(25)23929-5

tissue_or_cell_type

Nucleus accumbens

Alcohol: ethanol clearance, acetaldehyde, the channels it binds, organ injury and nutrient collisions (2026-09-21) · lines 423–434

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · In vivo microdialysis in freely moving rats · source_derived_draft · unverified_draft

### alcohol-accumbens-dopamine Ethanol preferentially stimulated dopamine release in the nucleus accumbens of freely moving rats. Condition category: normal nutrient_topic: Alcohol research collection; topical membership is not evidence of a direct clinical effect, and ethanol is recorded separately from the acetaldehyde it becomes. plain_language: Alcohol raises dopamine in the brain region that marks things as worth repeating. organism: Rat tissue_or_cell_type: Nucleus accumbens experimental_model: In vivo microdialysis in freely moving rats limitations: A reward-pathway measurement in freely moving animals. Dopamine release is a correlate of reinforcement, not a measure of liking or dependence. exposure: Ethanol administration with regional dopamine measurement evidence_span: {"source_cache": "artifacts/alcohol-research/3761194.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "98cf7c1ea1f6fbf3da6b89ab6beaed01a679ea1c8d4823f00952692a0c9203ca", "start_char": 0, "end_char": 1539, "text_sha256": "98cf7c1ea1f6fbf3da6b89ab6beaed01a679ea1c8d4823f00952692a0c9203ca"} [alcohol-p3761194] Preferential stimulation of dopamine release in the nucleus accumbens of freely moving rats by ethanol. (1986). https://pubmed.ncbi.nlm.nih.gov/3761194/ DOI: 10.1016/s0022-3565(25)23929-5