4.7 Article

Cytoskeletal stabilization of inhibitory interactions in immunologic synapses of mature human dendritic cells with natural killer cells

Journal

BLOOD
Volume 118, Issue 25, Pages 6487-6498

Publisher

AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2011-07-366328

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Funding

  1. Portuguese Foundation for Science and Technology, Portugal
  2. National Cancer Institute [R01CA108609]
  3. Cancer Research Switzerland [KFS-02 652-08-2010]
  4. Sassella Foundation [10/02]
  5. Vontobel Foundation
  6. Association for International Cancer Research
  7. Swiss National Science Foundation [310030_126995]
  8. Swiss National Science Foundation (SNF) [310030_126995] Funding Source: Swiss National Science Foundation (SNF)

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Human mature dendritic cells (DCs) can efficiently stimulate natural killer (NK)-cell responses without being targeted by their cytotoxicity. To understand this important regulatory crosstalk, we characterized the development of the immunologic synapse between mature DCs and resting NK cells. Conjugates between these 2 innate leukocyte populations formed rapidly, persisted for prolonged time periods and matured with DC-derived f-actin polymerization at the synapse. Polarization of IL-12 and IL-12R to the synapse coincided with f-actin polymerization, while other activating and inhibitory molecules were enriched at the interface between DCs and NK cells earlier. Functional assays revealed that inhibition of f-actin polymerization in mature synapses led to an increase of IFN-gamma secretion and cytotoxicity by NK cells. This elevated NK-cell reactivity resulted from decreased inhibitory signaling in the absence of MHC class I polarization at the interface, which was observed on inhibition of f-actin polymerization in DCs. Thus, inhibitory signaling is stabilized by f-actin at the synapse between mature DCs and resting NK cells. (Blood. 2011;118(25):6487-6498)

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