Abstract:
:Although malignant diseases are known to be associated with immune suppression, detailed mechanisms of this phenomenon are still unknown. NKG2D is an activating cell surface receptor expressed by natural killer (NK) cells and CD8+ T cells, and it has been reported that NKG2D engagement is extremely important for T cell activation. In the current study, NKG2D expression on CD8+ T cells and the frequency of CD4+ CD25+ regulatory T (Treg) cells were determined by multicolor flow cytometry to investigate one of the mechanisms responsible for immune evasion in esophageal cancer patients. NKG2D expression on CD8+ T lymphocytes in esophageal cancer patients was significantly lower than in those of normal controls. NKG2D expression in T3/T4 esophageal cancer was significantly lower than that in T1/T2 esophageal cancer. CD8+ T cells from patients with lymph node metastasis expressed significantly lower NKG2D than those without lymph node metastasis. Moreover, significantly lower NKG2D expression was observed in stage III/IV cancer in comparison with stage I/II. The frequency of CD4+CD25+ Treg cells in esophageal cancer patients was significantly higher than those in normal controls. NKG2D expression on CD8+ T cells was significantly inversely correlated with the frequency of CD4+CD25+ Treg cells in esophageal cancer patients. Our data indicates that decreased NKG2D expression on CD8+ T cells is correlated with disease severity. Decreased NKG2D expression and an increase in Treg cells may be one of the key mechanisms responsible for immune evasion in esophageal cancer.
journal_name
Dis Esophagusjournal_title
Diseases of the esophagus : official journal of the International Society for Diseases of the Esophagusauthors
Osaki T,Saito H,Fukumoto Y,Yamada Y,Fukuda K,Tatebe S,Tsujitani S,Ikeguchi Mdoi
10.1111/j.1442-2050.2008.00855.xsubject
Has Abstractpub_date
2009-01-01 00:00:00pages
49-54issue
1eissn
1120-8694issn
1442-2050pii
DES855journal_volume
22pub_type
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journal_title:Diseases of the esophagus : official journal of the International Society for Diseases of the Esophagus
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journal_title:Diseases of the esophagus : official journal of the International Society for Diseases of the Esophagus
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journal_title:Diseases of the esophagus : official journal of the International Society for Diseases of the Esophagus
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journal_title:Diseases of the esophagus : official journal of the International Society for Diseases of the Esophagus
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journal_title:Diseases of the esophagus : official journal of the International Society for Diseases of the Esophagus
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journal_title:Diseases of the esophagus : official journal of the International Society for Diseases of the Esophagus
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journal_title:Diseases of the esophagus : official journal of the International Society for Diseases of the Esophagus
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journal_title:Diseases of the esophagus : official journal of the International Society for Diseases of the Esophagus
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