TRPV1 Receptor

Negative allosteric modulator at CB1; agonist at 5-HT1A, TRPV1; modulates GABA-A. Potent CYP3A4/2C9/2C19 inhibitor — major source of pharmacokinetic interactions.

Selective TRPV1 agonist. Acute activation produces burning and analgesia; sustained or repeated exposure causes nociceptor desensitization and substance-P depletion, which is the basis for topical analgesic efficacy.

Studies report cinnamaldehyde may activate TRPV1, modulate NF-κB signalling, suppress TNF-α production, and inhibit fungal lanosterol 14α-demethylase (CYP51A), investigated as a basis for antifungal and anti-inflammatory activities.

Meghwal et al. (2013) report piperine has demonstrated activity at TRPV1 receptors, inhibition of NF-κB and COX-2-related inflammatory pathways, and monoamine oxidase inhibitory effects in preclinical models. Piperine is also reported to inhibit P-glycoprotein and CYP enzyme systems, with consequent effects on drug bioavailability. Turrini et al. (2020) additionally describe preclinical anticancer pathway modulation, including effects on cell-cycle and apoptotic signalling.

Piperine is reported in preclinical studies to activate TRPV1, inhibit COX and LOX pathways, suppress NF-κB signalling, and modulate serotonin reuptake. Bioavailability-enhancement properties (inhibition of drug-metabolising enzymes including CYP3A4 and P-gp) are extensively discussed in systematic review data (Takooree et al. 2019).

1,8-Cineole, a major cardamom volatile, is a documented agonist of the cold/menthol receptor TRPM8 (along with related cooling/airway effects), a compound-specific and well-characterized molecular interaction.

Preclinical studies report eugenol inhibits COX-1/COX-2 and NF-κB signalling, suppresses PGE2 synthesis, and modulates TRPV1 and voltage-gated sodium channels; proposed as the primary driver of observed analgesic and anti-inflammatory signals.

1,8-Cineole is a documented agonist of the cold-sensing TRPM8 channel, a compound-specific, well-characterized molecular interaction underlying its cooling sensation.

Carvacrol is a documented agonist of TRPV1 (and TRPA1/TRPM8); this thymol/carvacrol class action on TRP channels is well studied and underlies sensory/irritant and analgesic effects. Compound-specific, not generic.

Preclinical mechanistic data associate eugenol with TRPV1 modulation, COX-2 inhibition, and sodium-channel blockade; contribution via aromatherapy exposure is unquantified.

1,8-Cineole is a documented modulator of TRPV1; its cooling/analgesic and airway sensory effects are mediated in part via TRP channel interaction. Compound-specific, well-studied for monoterpenoid TRP modulation.

Carvacrol is a well-characterized agonist/activator of TRPV1 (and also modulates TRPA1/TRPM8); this is a documented, compound-specific molecular action of the thyme monoterpenoid relevant to its sensory and antinociceptive effects.