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1996-02-26
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Document 1074
DOCN M9621074
TI Encapsulation of foscarnet in liposomes modifies drug intracellular
accumulation, in vitro anti-HIV-1 activity, tissue distribution and
pharmacokinetics.
DT 9602
AU Dusserre N; Lessard C; Paquette N; Perron S; Poulin L; Tremblay M;
Beauchamp D; Desormeaux A; Bergeron MG; Centre de Recherche en
Infectiologie, Centre Hospitalier de; I'Universite Laval, Ste-Foy,
Quebec, Canada.
SO AIDS. 1995 Aug;9(8):833-41. Unique Identifier : AIDSLINE MED/96014955
AB OBJECTIVE: To improve the in vitro anti-HIV-1 activity, intracellular
accumulation in macrophages and in vivo pharmacokinetics and tissue
distribution of foscarnet (trisodium phosphonoformate; PFA) by
encapsulation in liposomes. METHODS: The accumulation of free and
liposome-encapsulated PFA was determined in monocyte-macrophage RAW
264.7 cells and human premonocytoid U937 cells. The antiviral activity
was evaluated in U937 cells infected with HIV-1IIIB. Tissue distribution
and pharmacokinetics of free and liposomal PFA were determined in female
Sprague-Dawley rats following the administration of an intravenous bolus
dose (10 mg PFA/kg). RESULTS: The entrapment of PFA in liposomes
resulted in a higher drug accumulation in both U937 and RAW 264.7 cells.
A slightly greater efficacy against HIV-1IIIB replication into U937
cells was observed upon encapsulation of PFA into liposomes. Improved
pharmacokinetics was observed upon entrapment of PFA in liposomes. Much
higher drug levels were found in plasma for the liposomal formulation.
The systemic clearance of the liposomal drug was 77 times lower than
that of free drug. The encapsulation of PFA in liposomes greatly
enhanced the drug accumulation in organs of the reticuloendothelial
system. CONCLUSION: The encapsulation of PFA in liposomes modified the
tissue distribution and plasma pharmacokinetics of the antiviral agent,
resulting in a marked improvement of drug accumulation in organs
involved in HIV immunopathogenesis and in a greater PFA bioavailability.
The antiviral activity of liposomal PFA was slightly greater than that
of free drug in HIV-1IIIB-infected U937 cells.
DE Animal Antiviral Agents/*ADMINISTRATION & DOSAGE/PHARMACOLOGY/
*PHARMACOKINETICS Base Sequence Cell Line DNA Primers/GENETICS DNA,
Viral/GENETICS Female Foscarnet/*ADMINISTRATION &
DOSAGE/PHARMACOLOGY/*PHARMACOKINETICS Human HIV-1/*DRUG
EFFECTS/GENETICS Injections, Intravenous Liposomes
Macrophages/METABOLISM Molecular Sequence Data Polymerase Chain
Reaction Rats Rats, Sprague-Dawley Support, Non-U.S. Gov't Tissue
Distribution JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).