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Document 1045
DOCN M9651045
TI Phosphatidyl-2',3'-dideoxy-3'-thiacytidine: synthesis and antiviral
activity in hepatitis B-and HIV-1-infected cells.
DT 9505
AU Xie H; Voronkov M; Liotta DC; Korba BA; Schinazi RF; Richman DD;
Hostetler KY; Department of Medicine, University of California, San
Diego, La; Jolla 92093, USA.
SO Antiviral Res. 1995 Oct;28(2):113-20. Unique Identifier : AIDSLINE
MED/96126404
AB We recently found that phosphatidyl-2',3'-dideoxycytidine
(phosphatidyl-ddC) had substantial anti-hepatitis B virus (HBV) activity
in vitro compared to 2',3'-dideoxycytidine (ddC) (Hostetler et al.
(1994) Antiviral Res. 24, 59-67). Upon administration of liposomal
phosphatidyl-ddC to mice, a 40-fold higher drug area under curve was
observed in the liver. To evaluate the possibility of using
liver-targeted anti-HBV nucleosides to treat woodchuck hepatitis virus,
we wanted to find the most potent and selective lipid conjugates. It has
been shown that 2',3'-dideoxy-3'-thiacytidine as a racemic mixture of
the cis-isomer (cis-(+/-)-BCH-189) has much greater activity against HBV
viruses than ddC in vitro. Recently, it was shown that the
(-)-beta-L-enantiomer (3TC) is more active and less toxic than the
(+)-beta-D-form ((+)-BCH-189). To determine whether phospholipid
conjugates of 3TC retain antiviral activity in 2.2.15 cells as
demonstrated previously with ddC, we synthesized the
1,2-dipalmitoyl-sn-glycerol-3-phosphate conjugates of (+/-)-BCH-189 and
3TC and assessed their anti-HBV and anti-HIV activities, in vitro.
Phosphatidyl-3TC and phosphatidyl-BCH-189 had antiviral activity
comparable to the respective free drugs in 2.2.15 cells which
chronically produce HBV. In HIV-1-infected human peripheral blood
mononuclear cells and HT4-6C cells, phosphatidyl-3TC and
phosphatidyl-(+/-)-BCH-189 exhibited significantly lower activity than
the corresponding free nucleosides. In view of the documented ability of
phosphatidyl-ddC to target drug to the liver, it seems reasonable to
expect that phosphatidyl-3TC or phosphatidyl-(+/-)-BCH-189 could be
employed to provide greatly enhanced hepatic antiviral activity in HBV
infection in vivo.
DE Antiviral Agents/CHEMISTRY/*PHARMACOLOGY Cell Line Hepatitis B
Virus/*DRUG EFFECTS Human HIV-1/*DRUG EFFECTS Molecular Structure
Prodrugs/PHARMACOLOGY Reverse Transcriptase
Inhibitors/CHEMISTRY/*PHARMACOLOGY Support, U.S. Gov't, Non-P.H.S.
Support, U.S. Gov't, P.H.S. Zalcitabine/*ANALOGS &
DERIVATIVES/CHEMISTRY/PHARMACOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).