The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 183, 1415-1426, Copyright © 1996 by Rockefeller University Press


ARTICLES

LFA-1-deficient mice show normal CTL responses to virus but fail to reject immunogenic tumor

R Schmits, TM Kundig, DM Baker, G Shumaker, JJ Simard, G Duncan, A Wakeham, A Shahinian, A van der Heiden, MF Bachmann, PS Ohashi, TW Mak and DD Hickstein
Amgen Institute, Ontario Cancer Institute, Department of Medical Biophysics, Toronto, Canada.

The leukocyte integrin LFA-1 (CD11a/CD18) plays an important role in lymphocyte recirculation and homotypic interactions. Leukocytes from mice lacking CD11a displayed defects in in vitro homotypic aggregation, in proliferation in mixed lymphocyte reactions, and in response to mitogen. Mutant mice mounted normal cytotoxic T cell (CTL) responses against systemic LCMV and VSV infections and showed normal ex vivo CTL function. However, LFA-1-deficient mice did not reject immunogenic tumors grafted into footpads and did not demonstrate priming response against tumor-specific antigen. Thus CD11a deficiency causes a selective defect in induction of peripheral immune responses whereas responses to systemic infection are normal.
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