Abstract
Natural killer (NK) cells comprise a set of lymphocytes that is capable of mediating innate immune responses to viral infections, malignancies, and allogeneic bone marrow grafts. This review summarizes what is known about the mechanisms NK cells use to arrive at their sites of action. NK cells express a wide array of adhesion molecules including alphaLbeta2, alphaMbeta2, alphaXbeta2, and alpha4beta1 integrins, ICAM-1, PSGL-1, and L-selectin. Like other immune and inflammatory cells, NK cells use the blood circulation to enter tissues and organs, which requires that they interact with the vessel wall under flow conditions, arrest, and transmigrate. NK cells are able to chemotax to a variety of cytokines and chemokines, including IL-12, IFN-(alpha/beta, CCL2, 3, 4, 5, 7, 8, CXCL8, and CX3CL1. In many cases, NK cells appear to migrate towards these soluble factors without any kind of priming. These cells also appear to distribute in secondary and tertiary lymphoid sites (i.e., spleen, bone marrow, liver, lung, and lymph nodes) both with and without stimulation. In addition to their ability to move throughout the body in an unprimed state, activated NK cells may have increased specificity in homing to sites of inflammation. NK cell...Continue Reading
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