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1994-09-03
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Document 0076
DOCN M9490076
TI Critical involvement of human T cell leukaemia virus type I virions in
mediating the viral mitogenic effect.
DT 9411
AU Casse H; Girerd Y; Gazzolo L; Duc Dodon M; Centre National de la
Recherche Scientifique, Universite Claude; Bernard, Faculte de Medecine
A. Carrel, Lyon, France.
SO J Gen Virol. 1994 Aug;75 ( Pt 8):1909-16. Unique Identifier : AIDSLINE
MED/94321980
AB Human T cell leukaemia virus type I (HTLV-I) is a direct activator of
human resting T lymphocytes. The present study was undertaken to
delineate further the role of viral particles and to define the
involvement of envelope glycoproteins in the induction of T cell
mitogenic stimulation. Virus-producing cells treated with
paraformaldehyde (PFA) were found to be unable to induce the formation
of syncytia, but still able to trigger the proliferation of resting T
cells. Likewise, PFA-treated virus particles were still mitogenic. These
results suggest that the mitogenic event is triggered before the fusion
of the envelope with the cell membrane. Furthermore, HTLV-I
envelope-expressing cells obtained after infection of C8166/45 cells
(HTLV-I-transformed, but defective in virion production) with an HTLV-I
envelope recombinant vaccinia virus were unable to activate normal T
cells. Human immuno-deficiency virus type 1 particles produced by
C8166/45 cells were also devoid of mitogenic ability. However, when
HTLV-I viral preparations were purified by chromatography, only the
virion-containing fractions were found to be mitogenic for human resting
T lymphocytes. This mitogenic activity was partially abolished by
preincubating the purified virus with a monoclonal antibody directed to
the surface envelope glycoprotein. Finally, treatment of
HTLV-I-transformed cells by tunicamycin, an inhibitor of N-linked
glycosylation, led to the production of virus particles with a decreased
mitogenic activity. Collectively, these observations suggest that the
HTLV-I mitogenic activity is triggered by the contact of HTLV-I virions
with T cells.
DE Cell Division Human HTLV-I/*IMMUNOLOGY *Lymphocyte Transformation
Mitogens Recombinant Proteins/IMMUNOLOGY Support, Non-U.S. Gov't
T-Lymphocytes/*IMMUNOLOGY Viral Envelope Proteins/GENETICS/IMMUNOLOGY
Virion/*IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).