CLINICAL-PHARMACOLOGY OF RECOMBINANT HUMAN LUTEINIZING-HORMONE - PARTII - BIOAVAILABILITY OF RECOMBINANT HUMAN LUTEINIZING-HORMONE ASSESSED WITH AN IMMUNOASSAY AND AN IN-VITRO BIOASSAY
Jy. Lecotonnec et al., CLINICAL-PHARMACOLOGY OF RECOMBINANT HUMAN LUTEINIZING-HORMONE - PARTII - BIOAVAILABILITY OF RECOMBINANT HUMAN LUTEINIZING-HORMONE ASSESSED WITH AN IMMUNOASSAY AND AN IN-VITRO BIOASSAY, Fertility and sterility, 69(2), 1998, pp. 195-200
Objective: To assess the single-dose pharmacokinetics of a recombinant
human LH preparation administered by the IV, IM, and SC route. Design
: Prospective, randomized cross-over study. Setting: Phase I clinical
research environment. Patient(s): Twelve healthy pituitary down-regula
ted females. Intervention(s): Subjects received single IV, IM, and SC
doses of 10,000 IU of recombinant human LH, each separated by 1 week.
Main Outcome Measure(s): Pharmacokinetic parameters. Result(s): After
single IV administration, the pharmacokinetics were described by a two
-compartment model, after IM or SC administration, by a one-compartmen
t model with zero order absorption and a lag time. Using the immunoass
ay, after IV administration initial half-life was 1 hour and terminal
half-life was 10 hours (half-life was prolonged after extravascular ad
ministration, suggesting rate-limiting absorption). Total serum cleara
nce was 2.6 Lih, and steady-state volume of distribution was 14 L. Obs
erved C-max, after IM and SC administration, was 43 IU/L with median t
(max) of 9 hours (IM) and 5 hours (SC). Bioavailability was 0.54 (IM)
and 0.56 (SC). The pharmacokinetics of LH are comparable using an in v
itro bioassay. Conclusion(s): The terminal half-life of recombinant hu
man LH is around 12 hours and is slightly prolonged after extravascula
r administration. The pharmacokinetics are similar after IM and SC inj
ection, and one-half the administered dose is available systemically.
(C) 1998 by American Society for Reproducive Medicine.