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J. Virol., Apr 1995, 2257-2263, Vol 69, No. 4
S Huang, RI Endo and GR Nemerow
Entry of human adenovirus into host cells involves interaction of virus
particles with two distinct receptors. The initial binding event is
mediated by the fiber protein, while subsequent interaction of the penton
base protein with alpha v integrins promotes virus internalization and/or
penetration. Although these interactions in epithelial and endothelial
cells have been well characterized, relatively little is known as to
whether these events occur during virus infection of human peripheral blood
mononuclear cells. We demonstrate that freshly isolated peripheral blood
monocytes and T lymphocytes express very small amounts of alpha v integrins
and also are resistant to adenovirus infection. Exposure of monocytes to
hematopoietic growth factors granulocyte-macrophage colony-stimulating
factor and macrophage colony-stimulating factor induced expression of cell
surface alpha v integrins, promoted the binding of penton base protein, and
also rendered these cells susceptible to adenovirus- mediated gene
delivery. Stimulation of T cells with a mitogen, phytohemagglutinin, or a
cell-activating agent, phorbol myristate acetate, induced expression of
alpha v integrins and also enhanced adenovirus-mediated gene delivery.
These studies further indicate that alpha v integrins play a crucial role
in adenovirus infection and also provide a useful strategy for enhancing
adenovirus-mediated gene delivery into human peripheral blood mononuclear
cells.
Copyright © 1995, American Society for Microbiology
Upregulation of integrins alpha v beta 3 and alpha v beta 5 on human monocytes and T lymphocytes facilitates adenovirus-mediated gene delivery
Department of Immunology, Scripps Research Institute, La Jolla, California 92037.
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