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NK Cells Rapidly Reject Allogeneic Bone Marrow in the Spleen Through a Perforin‐ and Ly49D‐Dependent, but NKG2D‐Independent Mechanism
Author(s) -
Hamby K.,
Trexler A.,
Pearson T. C.,
Larsen C. P.,
Rigby M. R.,
Kean L. S.
Publication year - 2007
Publication title -
american journal of transplantation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 188
eISSN - 1600-6143
pISSN - 1600-6135
DOI - 10.1111/j.1600-6143.2007.01864.x
Subject(s) - bone marrow , perforin , immunology , nkg2d , medicine , spleen , cancer research , immune system , biology , cytotoxic t cell , cd8 , in vitro , biochemistry
We have used a sensitive and specific in vivo killing assay to monitor the kinetics, anatomic location and mechanisms controlling NK‐mediated rejection of Balb/c bone marrow by C57BL/6 natural killer (NK) cells. We find that NK killing of fully allogeneic bone marrow is a rapid, highly efficient process, leading to substantial rejection of transplanted marrow within 6 h of transplant and elimination of 85% of the transplanted cells within 2 days. NK‐mediated rejection occurred predominantly in the spleen, with sparing of rejection in the bone marrow and lymph nodes. Rejection was dependent on Perforin gene function, but was independent of interferon‐gamma. Finally, rejection of Balb/c bone marrow by B6 NK cells required signaling through the Ly49D receptor, but occurred despite blockade of NKG2D, which distinguishes these results from previous studies using semiallogeneic transplant pairs. These results identify NK cells as highly active mediators of bone marrow rejection, and suggest that inhibiting NK function early during transplantation may increase the efficiency of engraftment and allow successful engraftment of limiting doses of donor bone marrow.