Because NK cells lack gene-recombination machinery and are thought to be relatively short-lived, it is unclear whether NK cells can mount long-term effective recall responses to reinfections by diverse pathogens. In this article, we report that FcRg-deficient NK cells, which we recently identified and termed g-NK cells, possess distinct memory features directed by FcR-mediated Abdependent target recognition. The presence of g-NK cells was associated with prior human CMV (HMCV) infection, yet g-NK cell responses were not restricted to HCMV-infected target cells. In the presence of virusspecific Abs, g-NK cells had greatly enhanced functional capabilities, superior to conventional NK cells, and were highly responsive to cells infected with either HCMV or HSV-1. Remarkably, the g -NK cell subset persisted long-term at nearly constant levels in healthy individuals. Therefore, FcRγ deficiency distinguishes an Ab-dependent memory-like NK cell subset with enhanced potential for broad antiviral responses.
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