alexa Human natural killer cell development and biology.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Farag SS, Caligiuri MA

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Abstract Natural killer cells are important innate immune effector cells with potentially broad applications in the treatment of human malignancy due to their ability to lyse neoplastic cells without the need for tumor-specific antigen recognition. Human NK cells can be divided into two functional subsets based on their surface expression of CD56; CD56(bright) immunoregulatory cells and CD56(dim) cytotoxic cells. In addition to functional differences, these NK cell subsets can be modulated differently by interleukin (IL)-2, which has permitted the development of lower dose, better tolerated IL-2 regimens for the in vivo expansion and activation of NK cells. The importance of early hematopoietic growth factors, such as c-kit ligand and flt-3 ligand, and their synergy with IL-15 in the development of human NK cells in the bone marrow has permitted the investigation of novel cytokine combinations for optimizing in vivo expansion of NK cell in the clinic. The importance of lymph nodes as a site for NK cell development has recently been elucidated. Furthermore, progress in the field of how NK cell recognize target cells via activating and inhibitory receptors, and how the balance of signals from these receptors can modulate NK cell activity has revolutionized our understanding of the selective killing of tumor cells by NK cells while sparing normal cells. In this review, we summarize current understanding of NK cell biology, and highlight how such knowledge may be translated to optimize the efficacy of using autologous or allogeneic NK cell for the immunotherapy of cancer. This article was published in Blood Rev and referenced in Journal of Clinical & Cellular Immunology

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