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M9630552.TXT
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1996-02-27
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Document 0552
DOCN M9630552
TI Characterization of the metabolites of the peptidomimetic human
immunodeficiency virus type 1 protease inhibitor SK&F 107461 in rats
using liquid chromatography/mass spectrometry.
DT 9603
AU Potts W; van Horn R; Anderson K; Blake T; Garver E; Joseph G; Dreyer G;
Shu A; Heys R; Fong KL; Department of Drug Metabolism and
Pharmacokinetics, SmithKline; Beecham Pharmaceuticals, King of Prussia,
PA 19406, USA.
SO Drug Metab Dispos. 1995 Aug;23(8):799-805. Unique Identifier : AIDSLINE
MED/96020207
AB The metabolic fate of SK&F 107461 [Cbz-Ala-Ala-Phe psi [CHOHCH2]
Gly-Val-Val-OMe], a potent and specific inhibitor of the protease
encoded by human immunodeficiency virus type 1, in male Sprague-Dawley
rats is described. SK&F 107461 is a hexapeptide analog containing a
hydroxyethylene linkage in place of one of the peptide bonds, and in
which the amino terminus is blocked with a carbobenzyloxy group and the
carboxy terminus is modified to a methyl ester. The major metabolites of
SK&F 107461 found in bile and urine after intravenous administration of
3H-labeled compound were characterized by LC/MS using either thermospray
or continuous flow/FAB models of ionization. Approximately 80% of the
administered radioactivity was recovered in the bile of bile
duct-exteriorized rats following an intravenous dose.
Radiochromatographic profiling indicated that SK&F 107461 was subject to
extensive biotransformation. Structures were determined for three major
biliary and five major urinary metabolites. Two of the major circulating
plasma metabolites observed after intravenous bolus administration had
similar retention times to metabolites that were observed in both bile
and urine. A pathway for the biotransformation of SK&F 107461 in the rat
is proposed. The parent molecule underwent two primary modes of
metabolism. Hydrolysis of the carboxy-terminal ester or hydrolysis of
the Ala-Ala peptide bond near the amino terminus were the primary
metabolic events. All of the other metabolites characterized can be
accounted for by exopeptidase activity subsequent to one or both of
these primary events. There were no major metabolites observed resulting
from anything other than hydrolysis of the ester or peptide bonds in the
parent molecule.
DE Amino Acid Sequence Animal Antiviral
Agents/BLOOD/*PHARMACOKINETICS/URINE Bile/METABOLISM Biotransformation
Chromatography, Liquid HIV Protease
Inhibitors/BLOOD/*PHARMACOKINETICS/URINE HIV-1/*ENZYMOLOGY Male
Molecular Sequence Data Oligopeptides/BLOOD/*PHARMACOKINETICS/URINE
Rats Rats, Sprague-Dawley Spectrum Analysis, Mass JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).