The influence of regional deposition on the pharmacokinetics of pulmonary-delivered human growth hormone in rabbits.

Abstract:

:The pulmonary deposition and pharmacokinetics of human growth hormone (hGH), administered by aerosol and instillate, in formulations containing 99mTc-DTPA (for gamma scintigraphic imaging) have been studied in five male New Zealand White rabbits. Gamma scintigraphy indicated that the peripheral:central deposition tended to be greater for aerosol (1.54) than for instillate (0.8). Two gamma scintigraphic methods were used to quantify dose deposited by aerosol, which permitted bioavailabilities to be determined. The bioavailable fraction for aerosolized hGH (45%) was greater than for instilled hGH (16%). This was attributed to the differential effects of mucociliary clearance. Absorption rate limited pharmacokinetics prevailed for both hGH formulations with post-peak half-lives approximately 10-fold greater than the intravenous elimination half-life of 40 min. Apparent absorption rate constants resulting from instillation and aerosolization were equivalent (0.0012 min-1 and 0.0020 min-1 respectively), however lung-to-blood transfer rate constants for aerosol delivery (0.00071 min-1) were greater than for instillation (0.00018 min-1).

journal_name

Pharm Res

journal_title

Pharmaceutical research

authors

Colthorpe P,Farr SJ,Smith IJ,Wyatt D,Taylor G

doi

10.1023/a:1016292232513

subject

Has Abstract

pub_date

1995-03-01 00:00:00

pages

356-9

issue

3

eissn

0724-8741

issn

1573-904X

journal_volume

12

pub_type

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