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M9620508.TXT
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1996-02-26
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Document 0508
DOCN M9620508
TI Weak binding of VX-478 to human plasma proteins and implications for
anti-human immunodeficiency virus therapy.
DT 9602
AU Livington DJ; Pazhanisamy S; Porter DJ; Partaledis JA; Tung RD; Painter
GR; Vertex Pharmaceuticals Inc., Cambridge, MA 02139, USA.
SO J Infect Dis. 1995 Nov;172(5):1238-45. Unique Identifier : AIDSLINE
MED/96036379
AB VX-478 is a potent inhibitor of human immunodeficiency virus type 1
(HIV-1) protease (Ki, 0.6 nM) and of HIV-1 replication in antiviral
assays (IC90, 80 nM). The fractional binding of VX-478 to human plasma
and to purified plasma proteins was determined by equilibrium dialysis
and difference UV spectrophotometry. Binding to alpha 1-acid
glycoprotein (89% at 2 microM total drug concentration, Kd of 4 microM)
accounts for its fractional binding in plasma (93%). Stopped-flow
spectrophotometry methods showed that binding is a reversible two-step
process. The measured dissociation rate constant approaches 100 s-1. The
antiviral effect of VX-478 was determined in the presence of 45% human
plasma, in which the IC90 increased by 1.5-fold compared with control
experiments in the presence of 15% fetal bovine serum. The effects of
protein binding on the antiviral activity of VX-478 are minor, as
expected for a weak drug-protein interaction.
DE Acquired Immunodeficiency Syndrome/*DRUG THERAPY Animal Antiviral
Agents/*BLOOD Blood Blood Proteins/*METABOLISM Cattle Fetus Human
HIV Protease Inhibitors/*BLOOD Kinetics Molecular Structure
Orosomucoid/*METABOLISM Protein Binding Spectrophotometry, Ultraviolet
Sulfonamides/*BLOOD JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).