home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The Arsenal Files 6
/
The Arsenal Files 6 (Arsenal Computer).ISO
/
health
/
med9604b.zip
/
M9640577.TXT
< prev
next >
Wrap
Text File
|
1996-03-04
|
3KB
|
47 lines
Document 0577
DOCN M9640577
TI Interferon treatment inhibits virus replication in HIV-1- and
SIV-infected CD4+ T-cell lines by distinct mechanisms: evidence for
decreased stability and aberrant processing of HIV-1 proteins.
DT 9604
AU Agy MB; Acker RL; Sherbert CH; Katze MG; Regional Primate Research
Center, School of Medicine, University; of Washington, Seattle 98185,
USA.
SO Virology. 1995 Dec 20;214(2):379-86. Unique Identifier : AIDSLINE
MED/96130176
AB We have examined the effects of interferon (IFN)-alpha/beta on HIV-1 and
SIV replication in CD4+ T-cell lines. To enable us to examine these
effects on a single cycle of virus replication, cells were synchronously
infected with HIV-1 LAI or SIV mac251. Cell lines included MT4 cells
which were responsive to IFN and, as controls, C8166 cells which failed
to respond to interferon treatment. Similar to previous reports, we
found that replication of both HIV-1 and SIV was markedly inhibited in
responsive MT4 cell lines treated with IFN. No such decreases were
observed in HIV-1-infected, IFN-treated C8166 cells. Levels of both
intracellular and extracellular viral antigens decreased in both HIV-1-
and SIV-infected MT4 cells treated with IFN. Whereas steady state levels
of viral-specific RNAs dramatically declined in SIV-infected cells, no
such decrease was observed in IFN-treated HIV-1-infected cells. In
accordance with these data, the rate of viral protein synthesis did not
significantly change in HIV-1-infected, IFN-treated MT-4 cells. Western
blot analysis of extracts prepared from IFN-treated HIV-1-infected cells
revealed a decreased accumulation of most HIV-1-specific glycoproteins
and proteins with the exception of the pr55 gag precursor. Pulse-chase
experiments confirmed the enhanced stability of pr55 in IFN-treated
cells, but also unexpectedly demonstrated the accelerated and
quantitative processing of the p26 precursor (p24 capsid [CA] plus p2)
to the final processed p24 (CA) polypeptide. These data, taken together,
suggest that IFN deregulated viral protein processing and caused reduced
protein stability in HIV-1-infected cells while inhibiting an earlier
stage of replication in SIV-infected cells.
DE Animal Cell Line CD4-Positive T-Lymphocytes/CYTOLOGY Gene Expression
Genes, Viral Human HIV Antigens/METABOLISM HIV-1/*DRUG
EFFECTS/PHYSIOLOGY Interferon-alpha/*PHARMACOLOGY
Interferon-beta/*PHARMACOLOGY Support, Non-U.S. Gov't Support, U.S.
Gov't, P.H.S. SIV/*DRUG EFFECTS/PHYSIOLOGY Viral Proteins/METABOLISM
Virus Replication/*DRUG EFFECTS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).