NK cell intrinsic regulation of MIP-1alpha by granzyme M

Nikola Baschuk, Nancy Wang, Sally V Watt, Heloise M Halse, Colin M House, Phillip Ian Bird, Richard Anthony Strugnell, Joseph A Trapani, Mark Smyth, Daniel M Andrews

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12 Citations (Scopus)


Granzymes are generally recognized for their capacity to induce various pathways of perforin-dependent target cell death. Within this serine protease family, Granzyme M (GrzM) is unique owing to its preferential expression in innate effectors such as natural killer (NK) cells. During Listeria monocytogenes infection, we observed markedly reduced secretion of macrophage inflammatory protein-1 alpha (MIP-1alpha) in livers of GrzM-deficient mice, which resulted in significantly impaired NK cell recruitment. Direct stimulation with IL-12 and IL-15 demonstrated that GrzM was required for maximal secretion of active MIP-1alpha. This effect was not due to reduced protein induction but resulted from heightened intracellular accumulation of MIP-1alpha, with reduced release. These results demonstrate that GrzM is a critical mediator of innate immunity that can regulate chemotactic networks and has an important role in the initiation of immune responses and pathogen control.
Original languageEnglish
Pages (from-to)1 - 11
Number of pages11
JournalCell Death & Disease
Issue number3 (Art. No.: e1115)
Publication statusPublished - 2014

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