A long-acting pegylated recombinant human growth hormone (Jintrolong ® ) in healthy adult subjects: Two single-dose trials evaluating safety, tolerability and pharmacokinetics.

What is known and objectiveJintrolong((R)) is a pegylated recombinant human growth hormone (rhGH) (PEG-rhGH) developed for weekly subcutaneous (sc) injection. The current human tolerability trial and pharmacokinetics (PK) trial evaluated the safety, tolerability and PK of single-dose Jintrolong((R)) injection in healthy adult subjects. MethodsBoth trials were single-centre, randomized, open-label and single-dose studies. In the human tolerability trial, 34 healthy subjects were randomized to receive single-dose Jintrolong((R)) sc injection (0.01, 0.06, 0.2, 0.5 or 0.8mg/kg) or placebo. In the PK study, 30 healthy male subjects were evenly randomized into 3 groups to receive single-dose Jintrolong((R)) sc injection (0.1, 0.2 or 0.4mg/kg), and the subjects receiving 0.4mg/kg Jintrolong((R)) were given a single sc injection of conventional rhGH (0.067mg/kg) after a 14-day washout period. Safety and PK profiles of Jintrolong((R)) were evaluated. Results and discussionJintrolong((R)) was well tolerated with no serious adverse events or local injection responses. The PK trial showed that the plasma growth hormone concentration elevated quickly and stayed at peak level between 12 and 48hours post-Jintrolong((R)) injection, then decreased gradually back to baseline within 168hours. Compared to single-dose conventional rhGH, Jintrolong((R)) at all doses demonstrated significantly longer half time and time to maximum plasma concentration, lower clearance and higher systemic drug exposure, indicating prolonged presence of GH in the subjects' circulation. Additionally, systemic exposure to Jintrolong((R)) increased in a dose-dependent manner. What is new and conclusionSingle-dose Jintrolong((R)) injection was well tolerated in healthy adult subjects, and the maximum tolerable dose was no lower than 0.8mg/kg. Jintrolong((R)) was long-acting with the potential for weekly administration.