Cytokine-Based Generation of CD49a⁺Eomes^-/+ Natural Killer Cell Subsets.

Recent studies have identified CD49a⁺Eomes^- and CD49a⁺Eomes⁺ subsets of tissue-resident NK (trNK) cells in different organs of the mouse. However, the characteristics of CD49a⁺Eomes^-/+ NK cell development and the regulation of Eomes expression in NK cells remain unclear. Here, we established an in vitro cytokine-based feeder-free system in which bone marrow progenitor cells differentiate into CD49a⁺ NK cells. IL-15 was identified as being the key cytokine in this system that supported the development and maintenance of CD49a⁺ NK cells. The CD49a⁺ NK cells generated were Eomes^-CD49b^- and shared the same phenotype as hepatic trNK cells. IL-4 induced the expression of Eomes in generated NK cells and converted them into CD49a⁺Eomes⁺ cells, which were phenotypically and functionally similar to uterine trNK cells. Moreover, the axis was identified as being important in the generation of CD49a⁺Eomes⁺ induced NK cells. Collectively, these studies describe an approach to generate CD49a⁺Eomes^-/+ subsets of NK cells and demonstrate important roles for IL-15 and IL-4 in the differentiation of these cells. These findings have potential for developmental research underlying the generation of different subsets of NK cells and the application of adoptive NK cell transfer therapies.

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