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SHIP influences signals from CD48 and MHC class I ligands that regulate NK cell homeostasis, effector function, and repertoire formation

Lookup NU author(s): Professor Colin Brooks

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Abstract

Previously, we showed that 2B4 is a dominant inhibitory receptor in SHIP-deficient NK cells that prevents efficient cytolysis of complex targets. We show in this study that 2B4 deficiency restores homeostatic control and cytolytic function to SHIP-deficient NK cells. However, 2B4−/−SHIP−/− NK cells still exhibit a profound disruption of their NK receptor repertoire and are compromised for induction of IFN-γ by several NK-activating receptors, including NKp46, NK.1.1, and NKG2D. In addition, we find that 2B4−/− NK cells have an extensively disrupted repertoire, including a supernormal frequency of NKp46+ NK cells. Consequently IFN-γ is induced on a much higher percentage of 2B4−/− NK cells following engagement of NKp46. We also find that both SHIP and 2B4 are required to prevent expression of Ly49B, a myeloid lineage MHC class I receptor not normally expressed by the NK lineage. Finally, when SHIP-deficient NK cells are on an H-2d background, they exhibit supernormal levels of Ly49A and possess normal cytolytic function against MHC-matched tumor targets and enhanced cytolysis of MHC mismatched tumor targets. However, despite normal or elevated cytolytic function, H2d SHIP−/− NK cells exhibit poor induction of IFN-γ like their H2b+ or 2B4−/− counterparts, demonstrating a uniform requirement for SHIP in induction of IFN-γ downstream of key NK activating receptors. These findings reveal a complex interplay of SHIP, 2B4, and MHC in the regulation of homeostasis, effector function, and repertoire formation in the NK cell lineage.


Publication metadata

Author(s): Fortenbery NR, Paraiso KH, Taniguchi M, Brooks C, Ibrahim L, Kerr WG

Publication type: Article

Journal: Journal of Immunology

Year: 2010

Volume: 184

Issue: 9

Pages: 5065-5074

Online publication date: 02/04/2010

Acceptance date: 04/03/2010

Print publication date: 01/05/2010

ISSN (print): 0022-1767

ISSN (electronic): 1550-6606

Publisher: American Association of Immunologists

URL: http://dx.doi.org/10.4049/jimmunol.0901862

DOI: 10.4049/jimmunol.0901862


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