Journal of General Virology, Vol 78, 3217-3226, Copyright © 1997 by Society for General Microbiology

ARTICLES

Cell cycle arrest rather than apoptosis is associated with measles virus contact-mediated immunosuppression in vitro

JJ Schnorr, M Seufert, J Schlender, J Borst, IC Johnston, V ter Meulen and S Schneider-Schaulies
Institute for Virology and Immunobiology, University of Wurzburg, Germany.

Acute measles is associated with pronounced immunosuppression characterized both by leukopenia and impaired lymphocyte functions. In an earlier study, we found that mitogen-dependent proliferation of uninfected human peripheral blood lymphocytes (PBLs) and spontaneous proliferation of human cell lines of lymphocytic or monocytic origin was impaired after contact with UV-inactivated, measles virus (MV)- infected cells, UV-inactivated MV or with cells transfected with MV glycoproteins (gp) F and H. We now show that mitogen-stimulated PBLs and Jurkat cell clones either highly sensitive or resistant to CD95- induced apoptosis have a similar sensitivity to MV-induced inhibition and do not undergo apoptosis. Moreover, unimpaired mitogen-dependent upregulation of important activation markers, including IL-2R, was observed in PBL cultures after contact with MV-infected, UV-irradiated presenter cells. This indicates that the cells were indeed viable and acquire a state of activation. Less IL-2 was released from PBLs after contact with MV-infected presenter cells when compared with that released after contact with uninfected cells. However, mitogen-induced proliferation of PBLs was not restored by addition of IL-2 under these conditions. It appeared that a higher fraction of mitogen-stimulated PBLs accumulated in the G0/G1 phase of the cell cycle after contact with MV-infected cells. Thus, the mitogen-unresponsiveness of PBLs seen after contact with MV-infected cells is due to cell cycle arrest rather than apoptosis.

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