Antinociceptive activity: molecular mechanisms & dependencies

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.

Human evidence only

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)

Dihydrocapsaicin was metabolized when incubated in vitro with liver tissue but not with brain tissue, a certain degree of biotransformation already took place in the intestinal lumen, there appears to be a saturable absorption and degradation process in the gastrointestinal tract and very effective metabolism in the liver, and the metabolic products did not show capsaicin-like biological activity.
Dihydrocapsaicin → First-pass metabolism during and after absorption source_derived_draftungraded
Experimental context and source evidence
evidence_span
{"source_cache": "artifacts/dihydrocapsaicin-research/2280802.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "92a4527b69cd4c342da3d0aed850597ef4491122baf20b6a681e43ab0a8e2dd1", "start_char": 0, "end_char": 1280, "text_sha256": "92a4527b69cd4c342da3d0aed850597ef4491122baf20b6a681e43ab0a8e2dd1"}
experimental_model
Intragastric, intravenous and subcutaneous administration of tritiated dihydrocapsaicin in anaesthetised rats with tissue extraction
exposure
Tritiated dihydrocapsaicin and unlabelled capsaicin given intragastrically, intravenously or subcutaneously
limitations
The comparison across routes is the point, and it is the reason every hypothermia study in this collection injects the drug rather than feeding it. Anaesthetised rats, and identification is chromatographic.
nutrient_topic
Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. · Dihydrocapsaicin
organism
Rat
plain_language
The liver breaks it down and the brain does not, and what the liver makes is inert.
primary_references
[dhc-p2280802] Absorption and metabolism of capsaicinoids following intragastric administration in rats. (1990). https://pubmed.ncbi.nlm.nih.gov/2280802/ DOI: 10.1007/bf00169449
tissue_or_cell_type
Portal blood, trunk blood, brain and liver
Dihydrocapsaicin: the second capsaicinoid, the hypothermia it is used to induce, what the gut and liver do to it, and what it does without TRPV1 (2026-09-21) · lines 517–528
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Intragastric, intravenous and subcutaneous administration of tritiated dihydrocapsaicin in anaesthetised rats with tissue extraction · source_derived_draft · unverified_draft
### dhc-liver-not-brain Dihydrocapsaicin was metabolized when incubated in vitro with liver tissue but not with brain tissue, a certain degree of biotransformation already took place in the intestinal lumen, there appears to be a saturable absorption and degradation process in the gastrointestinal tract and very effective metabolism in the liver, and the metabolic products did not show capsaicin-like biological activity. Condition category: normal nutrient_topic: Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. plain_language: The liver breaks it down and the brain does not, and what the liver makes is inert. organism: Rat tissue_or_cell_type: Portal blood, trunk blood, brain and liver experimental_model: Intragastric, intravenous and subcutaneous administration of tritiated dihydrocapsaicin in anaesthetised rats with tissue extraction limitations: The comparison across routes is the point, and it is the reason every hypothermia study in this collection injects the drug rather than feeding it. Anaesthetised rats, and identification is chromatographic. exposure: Tritiated dihydrocapsaicin and unlabelled capsaicin given intragastrically, intravenously or subcutaneously evidence_span: {"source_cache": "artifacts/dihydrocapsaicin-research/2280802.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "92a4527b69cd4c342da3d0aed850597ef4491122baf20b6a681e43ab0a8e2dd1", "start_char": 0, "end_char": 1280, "text_sha256": "92a4527b69cd4c342da3d0aed850597ef4491122baf20b6a681e43ab0a8e2dd1"} [dhc-p2280802] Absorption and metabolism of capsaicinoids following intragastric administration in rats. (1990). https://pubmed.ncbi.nlm.nih.gov/2280802/ DOI: 10.1007/bf00169449
Complete structured claim and evidence
Incubation of capsaicin with phenobarbital-induced rat liver postmitochondrial supernatant produced omega-hydroxycapsaicin, also detected in the urine of rabbits given capsaicin, and other analogs of capsaicin such as dihydrocapsaicin and nonivamide also formed similar metabolites via aliphatic hydroxylation; the polar metabolites were inactive when tested for antinociceptive activity and pungency while their parent compounds exhibited strong sensory effects, suggesting that hydroxylation of the side chain plays an important role in detoxification.
Dihydrocapsaicin → Hydroxylation of the aliphatic side chain of a capsaicinoid source_derived_draftungraded
Experimental context and source evidence
evidence_span
{"source_cache": "artifacts/dihydrocapsaicin-research/8614248.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "7c4eee5bf34dac159665170e5eca63fcbf3a5146133b9d7dc0b6ec01bda4493a", "start_char": 0, "end_char": 1399, "text_sha256": "7c4eee5bf34dac159665170e5eca63fcbf3a5146133b9d7dc0b6ec01bda4493a"}
experimental_model
Incubation with phenobarbital-induced rat liver postmitochondrial supernatant, with rabbit urine confirmation and in vivo activity testing
exposure
Capsaicin, dihydrocapsaicin and nonivamide incubated with an NADPH-generating system, with pentobarbital sleeping time as a readout of enzyme inhibition
limitations
Identifies side-chain hydroxylation as a shared detoxification route and shows the products are inactive. The enzyme-inhibition arm tested capsaicin, not dihydrocapsaicin, which is recorded on that claim.
nutrient_topic
Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. · Dihydrocapsaicin
organism
Rat and rabbit
plain_language
Putting a hydroxyl on the tail switches the molecule off, for both heat and pain relief.
primary_references
[dhc-p8614248] Metabolism of capsaicinoids: evidence for aliphatic hydroxylation and its pharmacological implications. (1995). https://pubmed.ncbi.nlm.nih.gov/8614248/ DOI: 10.1016/0024-3205(95)00091-7
tissue_or_cell_type
Liver
Dihydrocapsaicin: the second capsaicinoid, the hypothermia it is used to induce, what the gut and liver do to it, and what it does without TRPV1 (2026-09-21) · lines 530–541
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Incubation with phenobarbital-induced rat liver postmitochondrial supernatant, with rabbit urine confirmation and in vivo activity testing · source_derived_draft · unverified_draft
### dhc-side-chain-hydroxylation Incubation of capsaicin with phenobarbital-induced rat liver postmitochondrial supernatant produced omega-hydroxycapsaicin, also detected in the urine of rabbits given capsaicin, and other analogs of capsaicin such as dihydrocapsaicin and nonivamide also formed similar metabolites via aliphatic hydroxylation; the polar metabolites were inactive when tested for antinociceptive activity and pungency while their parent compounds exhibited strong sensory effects, suggesting that hydroxylation of the side chain plays an important role in detoxification. Condition category: normal nutrient_topic: Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. plain_language: Putting a hydroxyl on the tail switches the molecule off, for both heat and pain relief. organism: Rat and rabbit tissue_or_cell_type: Liver experimental_model: Incubation with phenobarbital-induced rat liver postmitochondrial supernatant, with rabbit urine confirmation and in vivo activity testing limitations: Identifies side-chain hydroxylation as a shared detoxification route and shows the products are inactive. The enzyme-inhibition arm tested capsaicin, not dihydrocapsaicin, which is recorded on that claim. exposure: Capsaicin, dihydrocapsaicin and nonivamide incubated with an NADPH-generating system, with pentobarbital sleeping time as a readout of enzyme inhibition evidence_span: {"source_cache": "artifacts/dihydrocapsaicin-research/8614248.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "7c4eee5bf34dac159665170e5eca63fcbf3a5146133b9d7dc0b6ec01bda4493a", "start_char": 0, "end_char": 1399, "text_sha256": "7c4eee5bf34dac159665170e5eca63fcbf3a5146133b9d7dc0b6ec01bda4493a"} [dhc-p8614248] Metabolism of capsaicinoids: evidence for aliphatic hydroxylation and its pharmacological implications. (1995). https://pubmed.ncbi.nlm.nih.gov/8614248/ DOI: 10.1016/0024-3205(95)00091-7
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.

Antinociceptive activity