home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The Arsenal Files 6
/
The Arsenal Files 6 (Arsenal Computer).ISO
/
health
/
med9603.zip
/
M9630474.TXT
< prev
next >
Wrap
Text File
|
1996-02-27
|
3KB
|
49 lines
Document 0474
DOCN M9630474
TI Ionizing radiation activates nuclear factor kappa B but fails to produce
an increase in human immunodeficiency virus gene expression in stably
transfected human cells.
DT 9603
AU Valerie K; Laster WS; Kirkham JC; Kuemmerle NB; Department of Radiation
Oncology, Massey Cancer Center, Medical; College of Virginia, Virginia
Commonwealth University, Richmond; 23298-0058, USA.
SO Biochemistry. 1995 Dec 5;34(48):15768-76. Unique Identifier : AIDSLINE
MED/96097003
AB We have investigated the differential effects of ultraviolet light(UV)
and ionizing radiation (IR) on human immunodeficiency virus type 1 (HIV)
and c-jun expression in HIVcat/HeLa cells. This cell line harbors
integrated copies of the chloramphenicol acetyltransferase (cat) gene
under control of the HIV promoter. Both UV and IR increased the binding
of nuclear proteins to an oligonucleotide spanning the HIV enhancer
region nuclear factor kappa B sites, but only UV increased HIVcat
steady-state mRNA and CAT activity. By comparison, transcription of the
cellular c-jun gene increased after both types of radiation, but UV was
at least 5-fold more effective than IR despite the fact that protein
binding to an activator protein 1 oligonucleotide increased similarly
after both UV and IR. The lack of HIVcat transcriptional response after
IR does not appear to be the result of the repressor binding to upstream
promoter elements since cells stably transfected with different HIV
promoter deletions showed a lack of response to IR distinguishable from
that of the intact promoter. While our findings indicate no correlation
between increased binding of transcription factors to upstream promoter
elements and increased expression of these genes after radiation, we did
observe major differences in how UV and IR affected chromatin structure.
UV produced extensive global chromatin decondensation, whereas IR did
not, as seen in the microscope and determined by the increased
susceptibility of chromatin to micrococcal nuclease digestion.(ABSTRACT
TRUNCATED AT 250 WORDS)
DE Chloramphenicol Acetyltransferase/GENETICS
Chromatin/CHEMISTRY/RADIATION EFFECTS DNA, Viral/METABOLISM Gene
Expression Regulation, Viral/*RADIATION EFFECTS Hela Cells Human
HIV/GENETICS/*RADIATION EFFECTS HIV Long Terminal Repeat Infrared Rays
Micrococcal Nuclease/METABOLISM NF-kappa B/METABOLISM/*RADIATION
EFFECTS Promoter Regions (Genetics) RNA,
Messenger/METABOLISM/RADIATION EFFECTS Support, U.S. Gov't, P.H.S.
Tetradecanoylphorbol Acetate/PHARMACOLOGY Transcription Factor
AP-1/METABOLISM/RADIATION EFFECTS Transcription, Genetic/DRUG
EFFECTS/RADIATION EFFECTS Transfection JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).