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1996-02-27
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Document 0528
DOCN M9630528
TI Augmentation of virus secretion by the human immunodeficiency virus type
1 Vpu protein is cell type independent and occurs in cultured human
primary macrophages and lymphocytes.
DT 9603
AU Schubert U; Clouse KA; Strebel K; Laboratory of Molecular Microbiology,
National Institute of; Allergy and Infectious Diseases, Bethesda,
Maryland 20892-0460,; USA.
SO J Virol. 1995 Dec;69(12):7699-711. Unique Identifier : AIDSLINE
MED/96079016
AB The human immunodeficiency virus type 1-specific Vpu protein is a small
integral membrane phosphoprotein that induces degradation of the virus
receptor CD4 in the endoplasmic reticulum and, independently, increases
the release of progeny virions from infected cells. To address the
importance of Vpu for virus replication in primary human cells such as
peripheral blood mononuclear cells (PBMC) and monocyte-derived
macrophages (MDM), we used three different sets of monocyte-tropic
molecular clones of human immunodeficiency virus type 1: a primary
isolate, AD8+, and two chimeric variants of the T-cell-tropic isolate
NL4-3 carrying the env determinants of either AD8+ or SF162
monocyte-tropic primary isolates. Isogenic variants of these chimeric
viruses were constructed to express either wild-type Vpu or various
mutants of Vpu. The effects of these mutations in the vpu gene on virus
particle secretion from infected MDM or PBMC were assessed by
determination of the release of virion-associated reverse transcriptase
into culture supernatants, Western blot (immunoblot) analysis of
pelleted virions, and steady-state or pulse-chase metabolic labeling.
Wild-type Vpu increased virus release four- to sixfold in MDM and two-
to threefold in PBMC, while nonphosphorylated Vpu and a C-terminal
truncation mutant of Vpu were partially active on virus release in
primary cells. These results demonstrate that Vpu regulates virus
release in primary lymphocyte and macrophage cultures in a similar
manner and to a similar extent to those previously observed in HeLa
cells or CD4+ T-cell lines. Thus, our findings provide evidence that Vpu
functions in a variety of human cells, both primary cells and continuous
cell lines, and mutations in Vpu affect its biological activity
independent of the cell type and virus isolate used.
DE Cells, Cultured Cloning, Molecular Comparative Study Gene Expression
Gene Products, vpu/BIOSYNTHESIS/ISOLATION & PURIF/*METABOLISM Genome,
Viral Hela Cells Human HIV Seronegativity HIV-1/GENETICS/*PHYSIOLOGY
Kinetics Lymphocytes/*VIROLOGY Macrophages/*VIROLOGY
Monocytes/VIROLOGY Proviruses/GENETICS/PHYSIOLOGY Support, Non-U.S.
Gov't Support, U.S. Gov't, P.H.S. Time Factors Transfection *Virus
Replication JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).