Journal
JOURNAL OF IMMUNOLOGY
Volume 178, Issue 9, Pages 5606-5611Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.178.9.5606
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Funding
- MRC [G0500563] Funding Source: UKRI
- Medical Research Council [G0500563] Funding Source: Medline
- Medical Research Council [G0500563] Funding Source: researchfish
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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, NIKG2D 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.
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