Journal
JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY
Volume 18, Issue 8, Pages 2262-2267Publisher
AMER SOC NEPHROLOGY
DOI: 10.1681/ASN.2007040423
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Natural killer (NK) cells are recognized for providing an important early innate immune response to viral and bacteria] pathogens and for the surveillance of stressed and transformed autologous cells. However, with the exception of a pronounced role in allogeneic hematopoietic stem cell rejection, it has been challenging to ascribe the precise roles for INK cells in reactivity to tissue and solid-organ transplants. In general, NK cells initiate a rapid, proinflammatory environment that is conducive to many forms of effective immune host defense. This reactivity is often considered deleterious to allograft survival because NK cells are implicated in promoting both acute and chronic graft injury. However, more recent findings indicate that NK cells can also play a surprisingly profound role in allograft tolerance induction. This duality of function requires a reconsideration of the nature and consequence of INK cell reactivity during the allograft response. This review focuses on the differing faces of NK cells, especially the unexpected role of NK cells in allograft tolerance induction.
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