Component
Human dopamine D2/D3 receptor pool in raclopride PET
Study-scoped entity; inspect species, exposure, model and limitations 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)
Caffeine 300 mg increased D2/D3 PET availability in putamen and ventral striatum, but not caudate, in 20 healthy participants.
Experimental context and source evidence
- evidence_access
- Primary abstract
- experimental_model
- Human raclopride PET, caffeine versus placebo.
- limitations
- Availability can reflect receptor levels or affinity. The direction did not support a simple increase in striatal dopamine release; receptor upregulation was an interpretation.
- nutrient_topic
- Caffeine collection; salts, coffee, species and coexposure contexts retain their identities. · Caffeine
- plain_language
- Caffeine changed a dopamine-receptor measurement in selected brain regions.
- primary_references
- Caffeine increases striatal dopamine D2/D3 receptor availability in the human brain. · 2015 · https://pubmed.ncbi.nlm.nih.gov/25871974/ · DOI 10.1038/tp.2015.46
Caffeine: receptors, metabolism, nutrient interactions, adaptation and discovery questions (2026-09-18) · lines 68–74
AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Human raclopride PET, caffeine versus placebo. · source_derived_draft · unverified_draft
## caf-dopamine-pet Caffeine changed a dopamine-receptor measurement in selected brain regions. Caffeine 300 mg increased D2/D3 PET availability in putamen and ventral striatum, but not caudate, in 20 healthy participants. Model: Human raclopride PET, caffeine versus placebo. Limitations: Availability can reflect receptor levels or affinity. The direction did not support a simple increase in striatal dopamine release; receptor upregulation was an interpretation. Evidence access: Primary abstract Caffeine increases striatal dopamine D2/D3 receptor availability in the human brain. · 2015 · https://pubmed.ncbi.nlm.nih.gov/25871974/ · DOI 10.1038/tp.2015.46
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.