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NKG2D is an activating receptor expressed on all human NK cells and a subset of T cells. In cytolytic conjugates between NK cells and target cells expressing its ligand MHC class I chain-related gene A, NKG2D accumulates at the immunological synapse with GM1-rich microdomains. Furthermore, NKG2D is specifically recruited to detergent-resistant membrane fractions upon ligation. However, in the presence of a strong inhibitory stimulus, NKG2D-mediated cytotoxicity can be intercepted, and recruitment of NKG2D to the immunological synapse and detergent-resistant membrane fractions is blocked. Also, downstream phosphorylation of Vav-1 triggered by NKG2D ligation is circumvented by coengaging inhibitory receptors. Thus, we propose that one way in which inhibitory signaling can control NKG2D-mediated activation is by blocking its recruitment to GM1-rich membrane domains. The accumulation of activating NK cell receptors in GM1-rich microdomains may provide the necessary platform from which stimulatory signals can proceed.

Type

Journal article

Journal

J Immunol

Publication Date

01/05/2007

Volume

178

Pages

5606 - 5611

Keywords

Actins, Cells, Cultured, G(M1) Ganglioside, Humans, Killer Cells, Natural, Lymphocyte Activation, Membrane Microdomains, NK Cell Lectin-Like Receptor Subfamily K, Phosphorylation, Proto-Oncogene Proteins c-vav, Receptors, Immunologic, Receptors, KIR2DL1, Receptors, Natural Killer Cell