Abstract
Natural Killer cells can distinguish between healthy and malignant cells and have the unique ability to lyse tumour cells without prior sensitization. Differences between murine and human NK cells complicate the translation of this knowledge into useful therapeutics. Humanized mouse models that support the development of human leukocytes are a promising avenue of research that aims to address this problem. Here we provide an in-depth phenotypic analysis of human NK cells in Balb/c Rag2(-/-)γ(c)(-/-) mice reconstituted with human hematopoietic stem cells. We have examined the development of NK cells in bone marrow, thymous, spleen, lymph node (LN) and liver. Interestingly, in naive reconstituted mice, NK cells were found in thymus and LN, but not in bone marrow. These NK cells expressed several inhibitory and activating receptors needed for malignant cell detection. Furthermore, we confirm that administration of recombinant human interleukin-15 (rhIL-15) or Ad-vector expressing hIL-15 is able to significantly enhance NK cell development and maturation, particularly in bone marrow and liver, in this model. Our results suggest that human NK cells developed in mice may have phenotypes and tissue distributions similar to those seen ...Continue Reading
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