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Natural killer (NK) cells play a pivotal role during immunity against viruses and circumstantial evidence also indicates that they can protect the host against developing tumors. Peripheral blood NK cells comprise CD56 bright CD16 lo/−  cells that constitutively express CD25 (IL-2Rα) and CD56 dim CD16 hi  cells that express CD25 upon activation. Using NK cells from two patients, one with a primary immunodeficiency characterized by a homozygous mutation in CD25 (born in year 2007 and studied since she was 3 years old) and one with a homozygous mutation in STAT5b (born in year 1992 and studied since she was 10 years old), we observed that the absence of IL-2 signaling through CD25 promotes the accumulation of CD56 bright CD16 high  NK cells, and that CD56 bright CD16 lo , CD56 bright CD16 high , and CD56 dim CD16 high  NK cells of this patient exhibited higher content of perforin and granzyme B, and proliferation capacity, compared to healthy donors. Also, CD56 bright  and CD56 dim  NK cells of this patient exhibited a reduced IFN-γ production in response to cytokine stimulation and increased degranulation against K562 cells. Also, the CD25-deficient patient presented a lower frequency of terminally differentiated NK cells in the CD56 dim CD16 hi  NK subpopulation compared to the HD (assessed by CD57 and CD94 expression). Remarkably, CD56 dim CD16 high  NK cells from both patients exhibited notoriously higher expression of CD62L compared to HD, suggesting that in the absence of IL-2 signaling through CD25 and STAT5b, NK cells fail to properly downregulate CD62L during their transition from CD56 bright CD16 lo/−  to CD56 dim CD16 hi  cells. Thus, we provide the first demonstration about the  in vivo  requirement of the integrity of the IL-2/CD25/STAT5b axis for proper human NK cell maturation.

Primary Immunodeficiencies Unravel the Role of IL-2/CD25/STAT5b in Human Natural Killer Cell Maturation