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N Sutkowski, ML Kuo, PS Amenta, JP Dougherty and Y Ron
Department of Molecular Genetics and Microbiology, University of Medicine
and Dentistry of New Jersey, Robert Wood Johnson Medical School, Piscataway
08854, USA.
An in vitro culture system has been developed for the long-term maintenance
of primary, human peripheral blood and umbilical cord blood T lymphocytes,
which does not rely on the use of stimulatory cytokines, antigen, or
mitogens. In these cultures, a monolayer of adherent cells, some
spindle-shaped and some resembling macrophages, developed within a week.
All adherent cells were positive for the extracellular matrix proteins
laminin and fibronectin, the intermediate filament vimentin, and for the
surface markers major histocompatibility complex class II,
platelet-endothelial cell adhesion molecule l (CD31), and E-Selectin
(ELAM-1; CD62E). They were negative for the leukocyte common antigen
(CD45), the macrophage marker MO-2 (CD14), muscle-specific actin, and
Factor VIII-related antigen. These monolayers supported the maintenance of
nonadherent, resting, mature T cells for up to 3 months, and these cells
retained their ability to respond to mitogens and allogeneic cells. Both
CD4+ and CD8+ cells were supported. The proportion of CD4+ and CD8+ cells
remained unchanged after 3 months in culture. We have also used T cells
from 2-month-old cultures as target cells for retroviral vector-mediated
gene transfer. Up to 30% of the long-term T cells expressed the transferred
lacZ gene after infection with a retroviral vector. The infection
efficiency was similar to that obtained for fresh peripheral blood T cells,
indicating that the long- term-cultured cells might be suitable for certain
gene therapy applications.
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| Copyright © 1995 by American Society of Hematology Online ISSN: 1528-0020 | |||||||||