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1994-10-25
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Document 3322
DOCN M94A3322
TI Inhibitory mechanism of camptothecin on HIV-1 replication.
DT 9412
AU Takahashi H; Kojima A; Kurata T; Dep. of Pathology, National Institute
of Health, Tokyo, Japan.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):102 (abstract no. PA0028). Unique
Identifier : AIDSLINE ICA10/94369253
AB OBJECTIVES--Camptothecin (CPT), a topoisomerase I inhibitor was reported
to block retroviral infection in vitro and in vivo. CPT is also known as
an antitumor drug and is toxic to eukaryotic cells. As HIV-1 replicates
very poorly in non-dividing cells, CPT inhibits HIV possibly by
suppressing cell growth, otherwise it may attack virion directly. Our
object is to know inhibitory effects of CPT on HIV and to understand a
role of topoisomerase I on HIV-1 replication. METHODS--HIV-1 viruses
were treated with CPT for 1-2 hours. The pretreated viruses were
infected to MT4 cells in the presence or absence of CPT. HIV-1
replication was measured by p24 ELISA and RT assays. RESULTS AND
DISCUSSION--Pretreatment of HIV-1 with CPT inhibited viral replication
in a dose-dependent fashion. Presence of CPT during infection showed
higher blocking of HIV-1 replication. Reduction of topoisomerase I
activity in infected MT-4 cells by CPT was associated with decrease of
HIV-1 infectivity. These results suggested that both virion-associated
and cellular topoisomerase I play a regulatory role of HIV-1
replication.
DE Camptothecin/*PHARMACOLOGY Cell Division/DRUG EFFECTS Cell Line DNA
Topoisomerase/ANTAGONISTS & INHIB/PHYSIOLOGY Human HIV Core Protein
p24/BIOSYNTHESIS HIV-1/*DRUG EFFECTS/ENZYMOLOGY/PHYSIOLOGY In Vitro
Reverse Transcriptase/BIOSYNTHESIS Virus Replication/*DRUG
EFFECTS/PHYSIOLOGY MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).