Pharmacokinetics, Mass Balance and Metabolism of [14C]HSK21542, a Novel Kappa Opioid Receptor Agonist, inHumans.

Abstract

HSK21542, a synthetic short-chain polypeptide, is a selective peripheral kappa opioid receptor (KOR) agonist. In this single-centre, non-randomized, open-label study, the pharmacokinetics, mass balance, metabolism and excretion ofHSK21542 were investigated. A single intravenous dose of 2μg/0.212μCi/kg [14C]HSK21542 was administered to sixhealthy male subjects. Samples of blood, urine and faeces were collected for quantitative determination of total radioactivity and unchangedHSK21542, and identification of metabolites. The mean total recovery was 81.89% of the radiolabelled dose over 240h post-dose, with 35.60% and 46.30% excreted in faeces and urine, respectively. The mean maximum concentration (Cmax), thehalf-life (t1/2) and the area under the concentration-time curve (AUC0-t) of total radioactivity (TRA) in plasma were 20.4±4.16ngEq./g, 1.93±0.322h and 21.8±2.93h·ngEq./g, respectively, while the Cmax, t1/2 and the AUC0-t of unchangedHSK21542 were 18.3±3.36ng/mL, 1.66±0.185h and 18.4±2.24h·ng/mL, respectively. The blood-to-plasma ratios of TRA at several times ranged from 0.46 to 0.54. [14C]HSK21542 was detected as the main circulating substance in plasma, accounting for 92.17% of the AUC of TRA. The unchanged parent compound was the only major radioactive chemical in urine (100.00% of TRA) and faeces (93.53% of TRA). Metabolites were veryminor components. HSK21542 was barely metabolized in vivo and mainly excreted with unchangedHSK21542 as its main circulating component in plasma. It was speculated that renal excretion was the principal excretion pathway, and faecal excretion was the secondary pathway. NCT05835934.