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 Blood, 15 April 2007, Vol. 109, No. 8, pp. 3603-3606.
Prepublished online as a Blood First Edition Paper on December 19, 2006; DOI 10.1182/blood-2006-05-024315.

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TRANSPLANTATION

Brief Report

Reduction of GVHD and enhanced antitumor effects after adoptive infusion of alloreactive Ly49-mismatched NK cells from MHC-matched donors

Andreas Lundqvist1, J. Philip McCoy2, Leigh Samsel2, and Richard Childs1

1 Hematology Branch and 2 Flow Cytometry Core Facility, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD

We investigated if an infusion of alloreactive natural killer (NK) cells would reduce GVHD and mediate antitumor effects in mice undergoing MHC-matched allogeneic stem cell transplantation (SCT). Balb/c mice bearing RENCA tumors underwent an allogeneic SCT from MHC-matched B10.d2 donors and were given a single infusion of either Ly49 ligand-matched, ligand-mismatched, or no donor NK cells. Recipients of Ly49 ligand-mismatched NK cells had a reduced incidence of graft-versus-host disease (GVHD; 39% vs 100%; P < .01), and prolonged survival (median 84 days vs 39 days; P < .01) compared with SCT recipients not receiving NK cells. Recipients of Ly49 ligand-matched NK cells had the same incidence of GVHD and similar survival compared with controls not receiving NK cells. Pulmonary tumor burden was significantly (P < .01) lower in recipients that received Ly49-mismatched or Ly49-matched NK cells compared with recipients not receiving NK cells. These data provide in vivo evidence that a single infusion of alloreactive donor NK cells reduces GVHD and mediates antitumor effects following MHC-matched allogeneic transplantation.


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