H2O2 production within tumor microenvironment inversely correlated with infiltration of CD56dim NK cells in gastric and esophageal cancer: possible mechanisms ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2011-12

AUTHORS

Shinichirou Izawa, Koji Kono, Kousaku Mimura, Yoshihiko Kawaguchi, Mitsuaki Watanabe, Takanori Maruyama, Hideki Fujii

ABSTRACT

Human NK cells can be divided into two subsets, CD56(dim)CD16(+)NK and CD56(bright)CD16(-)NK cells, based on their expression of CD56 and CD16. In the present study, we analyzed the relationship between CD56(dim)/CD56(bright) NK cells and H₂O₂ in tumor-infiltrating NK cells in patients with gastric (n = 50) and esophageal (n = 35) cancer. The ratio of CD56(dim) NK cells infiltrating tumors gradually decreased according to disease progression. H₂O₂ was abundantly produced within tumor microenvironments, and there was an inverse correlation between CD56(dim) NK cell infiltration and H₂O₂ production. CD56(dim) NK cells are more sensitive to apoptosis induced by physiological levels of H₂O₂ than CD56(bright) NK cells. Furthermore, the exposure of NK cells to H₂O₂ resulted in the impairment of ADCC activity. In conclusion, H₂O₂ produced within tumor microenvironments inversely correlated with the infiltration of CD56(dim) NK cells, possibly due to their preferentially induced cell death. These observations may explain one of the mechanisms behind NK cell dysfunction frequently observed in tumor microenvironments. More... »

PAGES

1801-1810

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00262-011-1082-7

DOI

http://dx.doi.org/10.1007/s00262-011-1082-7

DIMENSIONS

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PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/21811786


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