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Published on: December 31, 2007
CD160: a unique activating NK cell receptor
Philippe Le Bouteiller1, Julie Tabiasco, Beata Polgar
1Institut National de la Santé et de la Recherche Médicale, UMR1043, Toulouse F-31300, France. philippe.le-bouteiller@inserm.fr
Insights
CD160 is a unique NK cell receptor that recognizes MHC class I molecules. It requires adaptor proteins to signal, triggering cytokine release like IFN-γ, TNF-α, IL-6, and IL-8.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- CD160 is an essential natural killer (NK) cell activating receptor.
- Its unique characteristics differentiate it from other killer immunoglobulin-like receptors (KIRs).
- CD160's precise function and signaling pathways remain incompletely understood.
Purpose of the Study:
- To elucidate the unique structural and functional properties of the CD160 receptor.
- To investigate the signaling mechanisms and downstream effects of CD160 engagement.
- To compare CD160-mediated responses with those of other NK cell receptors.
Main Methods:
- Comparative analysis of CD160 gene conservation across species.
- Localization studies of the cd160 gene.
- Phenotypic analysis of CD160 expression on NK cells.
- Functional assays to assess CD160 recognition of MHC class I molecules.
- Biochemical studies to identify signaling adaptors and pathways.
- Cytokine and chemokine profiling following CD160 engagement.
Main Results:
- CD160 is conserved in mammals and located outside the NK and Leukocyte Receptor Complexes.
- CD160 expression is characteristic of CD56(dim) CD16+ cytotoxic NK cells.
- CD160 recognizes both MHC class Ia and Ib molecules.
- As a glycosylphosphatidylinositol-anchored molecule, CD160 lacks traditional activation motifs and requires adaptor proteins like phosphoinositide-3 kinase for signaling.
- Engagement of CD160 on circulating NK cells induces significant production of pro-inflammatory cytokines (IFN-γ, TNF-α, IL-6, IL-8) and MIP-1β chemokine.
- CD160-mediated IFN-γ production surpasses that induced by CD16 receptor engagement.
Conclusions:
- CD160 represents a distinct class of NK cell activating receptor with unique structural and signaling properties.
- Its ability to recognize MHC class I molecules and recruit signaling adaptors highlights its role in NK cell-mediated immunity.
- CD160 plays a significant role in orchestrating pro-inflammatory cytokine responses, particularly IFN-γ, IL-6, and IL-8, upon engagement with MHC class I molecules.
Abstract:
Here we discuss CD160 an essential NK cell activating receptor that remains poorly understood. CD160 receptor exhibits a number of unique structural and functional characteristics that are not common to other killer immunoglobulin-like receptors that recognize major histocompatibility complex (MHC) class I molecules: (1) In addition to humans and mice, the cd160 gene is conserved in several other mammal species; (2) cd160 is located outside the NK gene complex and the Leukocyte Receptor Complex in humans; (3) CD160 expression is associated to the CD56(dim) CD16+ cytotoxic NK cell phenotype; (4) both human and mouse CD160 recognize MHC class Ia and Ib molecules; (5) unlike the other MHC class I-dependent activating NK receptors, CD160 is a glycosylphosphatidylinositol-anchored molecule with a single immunoglobulin-like domain, and does not bear immunoreceptor tyrosine-based activation motifs. Consequently, CD160 cannot signal by itself, requiring the recruitment of adaptor proteins. CD160 recruits phosphoinositide-3 kinase to trigger cytotoxicity and cytokine secretion; (6) specific engagement of NK CD160 receptor expressed by circulating NK cells produces proinflammatory cytokines IFN-γ, TNF-α, and, most notably, IL-6 and IL-8 as well as MIP1-β chemokine. The level of CD160-mediated IFN-γ production is always higher than the one observed after engagement of the CD16 receptor.
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