Nalfurafine hydrochloride (TRK-820 hydrochloride) is a potent selective and orally active kappa opioid receptor (KOR) agonist. Nalfurafine hydrochloride (TRK-820 hydrochloride) enhances the therapeutic potential of MOR-targeting analgesics.
A single administration of subcutaneous TRK-820 significantly increased spontaneous ipsilateral rotational behavior of hemi-parkinsonian rats at 30 μg/kg though the efficacy is moderate and also significantly inhibited L-DOPA-induced dyskinesia at 10 and 30 μg/kg; this inhibition is reversed in the presence of nor-binaltorphimine, a kappa opioid receptor antagonist. TRK-820 dose-dependently inhibited phencyclidine-induced rat hyperlocomotion. TRK-820 dose-dependently attenuated the biochemical changes of both dopamine and serotonin in the prefrontal cortex of rats treated with phencyclidine without affecting their basal levels in normal rats.
Molecular Weight | 513.03 |
Formula | C28H33ClN2O5 |
CAS Number | 152658-17-8 |
Solubility (25°C) | DMSO 30 mg/mL |
Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
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