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Blood, 15 January 2007, Vol. 109, No. 2, pp. 670-673. Prepublished online as a Blood First Edition Paper on September 7, 2006; DOI 10.1182/blood-2006-07-036509.
Submitted July 19, 2006
Division of Cell and Molecular Biology, Sir Alexander Fleming Building, Imperial College London, UK * Corresponding author; email: d.davis{at}imperial.ac.uk.
The threat from cancer cells is inherently linked to cell-cycle progression, and viral genomes commonly replicate, e.g. within episomes or proviruses, during mitosis. We report here that human NK cells bound cells in mitosis, and attacked pathogenic cells in mitosis, more effectively than the same cells in other stages of the cell-cycle. Thus, cells in mitosis warrant and undergo heightened surveillance; a novel strategy for immunological assessment of danger. Recognition of cells in mitosis involved ligation of activating NK cell receptors and binding to target cell hyaluronan, a component of the pericellular matrix known to be increased during mitosis. Direct interaction between activating NK cell receptors and hyaluronan is possible but other mechanisms consistent with our data are also discussed.
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