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DOCK8 Drives Src-Dependent NK Cell Effector Function

Abstract

Mutations in the dedicator of cytokinesis 8 (DOCK8) gene cause an autosomal recessive form of hyper-IgE syndrome, characterized by chronic immunodeficiency with persistent microbial infection and increased incidence of malignancy. These manifestations suggest a defect in cytotoxic lymphocyte function and immune surveillance. However, how DOCK8 regulates NK cell-driven immune responses remains unclear. In this article, we demonstrate that DOCK8 regulates NK cell cytotoxicity and cytokine production in response to target cell engagement or receptor ligation. Genetic ablation of DOCK8 in human NK cells attenuated cytokine transcription and secretion through inhibition of Src family kinase activation, particularly Lck, downstream of target cell engagement or NKp30 ligation. PMA/Ionomycin treatment of DOCK8-deficient NK cells rescued cytokine production, indicating a defect proximal to receptor ligation. Importantly, NK cells from DOCK8-deficient patients had attenuated production of IFN-gamma and TNF-alpha upon NKp30 stimulation. Taken together, we reveal a novel molecular mechanism by which DOCK8 regulates NK cell-driven immunity.

Type Journal
ISBN 1550-6606 (Electronic) 0022-1767 (Linking)
Authors Kearney, C. J.; Vervoort, S. J.; Ramsbottom, K. M.; Freeman, A. J.; Michie, J.; Peake, J.; Casanova, J. L.; Picard, C.; Tangye, S. G.; Ma, C. S.; Johnstone, R. W.; Randall, K. L.; Oliaro, J.
Responsible Garvan Author Prof Stuart Tangye
Publisher Name JOURNAL OF IMMUNOLOGY
Published Date 2017-09-15 00:00:00
Status Published in-print
DOI 10.4049/jimmunol.1700751
URL link to publisher's version https://www.ncbi.nlm.nih.gov/pubmed/28794229