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M9630116.TXT
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1996-02-27
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Document 0116
DOCN M9630116
TI Protein kinase C-zeta mediates NF-kappa B activation in human
immunodeficiency virus-infected monocytes.
DT 9603
AU Folgueira L; McElhinny JA; Bren GD; MacMorran WS; Diaz-Meco MT; Moscat
J; Paya CV; Department of Immunology, Mayo Clinic, Rochester, Minnesota;
55905, USA.
SO J Virol. 1996 Jan;70(1):223-31. Unique Identifier : AIDSLINE
MED/96099434
AB The molecular mechanisms regulating human immunodeficiency virus (HIV)
persistence in a major cell reservoir such as the macrophage remain
unknown. NF-kappa B is a transcription factor involved in the regulation
of the HIV long terminal repeat and is selectively activated following
HIV infection of human macrophages. Although little information as to
what signal transduction pathways mediate NF-kappa B activation in
monocytes-macrophages is available, our previous work indicated that
classical protein kinase C (PKC) isoenzymes were not involved in the
HIV-mediated NF-kappa B activation. In this study, we have focused on
atypical PKC isoenzymes. PKC-zeta belongs to this family and is known to
be an important step in NF-kappa B activation in other cell systems.
Immunoblotting experiments with U937 cells demonstrate that PKC-zeta is
present in these cells, and its expression can be downmodulated by
antisense oligonucleotides (AO). The HIV-mediated NF-kappa B activation
is selectively reduced by AO to PKC-zeta. In addition, cotransfection of
a negative dominant molecule of PKC-zeta (PKC-zeta mut) with NF-kappa
B-dependent reporter genes selectively inhibits the HIV- but not phorbol
myristate acetate- or lipopolysaccharide-mediated activation of NF-kappa
B. That PKC-zeta is specific in regulating NF-kappa B is concluded from
the inability of PKC-zeta(mut) to interfere with the basal or phorbol
myristate acetate-inducible CREB- or AP1-dependent transcriptional
activity. Lastly, we demonstrate a selective inhibition of p24
production by HIV-infected human macrophages when treated with AO to
PKC-zeta. Altogether, these results suggest that atypical PKC
isoenzymes, including PKC-zeta, participate in the signal transduction
pathways by which HIV infection results in the activation of NF-kappa B
in human monocytic cells and macrophages.
DE Base Sequence Cells, Cultured Enzyme Inhibitors/PHARMACOLOGY Human
HIV/*PHYSIOLOGY Molecular Sequence Data Monocytes/METABOLISM/*VIROLOGY
NF-kappa B/*METABOLISM Oligonucleotides, Antisense/PHARMACOLOGY
Protein Kinase C/ANTAGONISTS & INHIB/GENETICS/*METABOLISM Tumor Cells,
Cultured Virus Replication/PHYSIOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).