Erschienen in:
01.05.2008 | Original Article
Ly49G2 receptor blockade reduces tumor burden in a leukemia model but not in a solid tumor model
verfasst von:
Melissa A. Barber, Tong Zhang, Bethany A. Gagne, Jo A. Van Ginderachter, Patrick De Baetselier, Charles L. Sentman
Erschienen in:
Cancer Immunology, Immunotherapy
|
Ausgabe 5/2008
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Abstract
Background
NK cell activity is regulated in part by inhibitory receptors that bind to MHC class I molecules. It is possible to enhance NK cell cytotoxicity against tumor cells by preventing the interaction of these inhibitory receptors with their MHC class I ligands.
Results
In this study, we determined that Ly49G2 is an inhibitory receptor in AKR mice for self-MHC class I, and AKR Ly49G2 has an identical sequence to BALB/c Ly49G2. Blockade of Ly49G2 receptors in vivo resulted in decreased growth of BW-Sp3 lymphoma cells when the tumor cells were given i.v. but not when the tumor cells were inoculated into the flank forming a solid tumor. However, NK cells were involved in inhibiting the growth of BW-Sp3 tumor cells in the flank.
Conclusion
These data demonstrate that the effectiveness of inhibitory receptor blockade depends upon the tissue location of the tumor cells.