Abstract:
:Upregulation of the inducible gene products MICA (human) and Rae-1 (mouse) may promote tumor surveillance and autoimmunity by engaging the activating receptor NKG2D on natural killer (NK) cells and T cells. Nevertheless, sustained expression of MICA by tumors can also elicit NKG2D downregulation, perhaps indicating 'immunoevasion'. Investigating this paradox, we report here that constitutive Rae-1epsilon transgene expression in normal epithelium elicited local and systemic NKG2D downregulation, generalized but reversible defects in NK cell-mediated cytotoxicity and mild CD8(+) T cell defects. The extent of NKG2D downregulation correlated well with the incidence and progression of cutaneous carcinogenesis, emphasizing the utility of NKG2D as a marker of tumor resistance. Thus, NKG2D engagement is a natural mediator of immunosurveillance, which can be compromised by locally sustained ligand expression but potentially restored by innate immune activation.
journal_name
Nat Immunoljournal_title
Nature immunologyauthors
Oppenheim DE,Roberts SJ,Clarke SL,Filler R,Lewis JM,Tigelaar RE,Girardi M,Hayday ACdoi
10.1038/ni1239keywords:
subject
Has Abstractpub_date
2005-09-01 00:00:00pages
928-37issue
9eissn
1529-2908issn
1529-2916pii
ni1239journal_volume
6pub_type
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