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• W2021002328 abstract "Cytotoxic CD8(+) T-cells mount immune responses to cancer via cytotoxic pathways including granzyme B. Cancer cells are also known to develop immune evasion mechanisms. We hypothesised that lung cancer cells would over-express the granzyme B-inhibitor, proteinase inhibitor-9 (PI-9) and down-regulate granzyme B expression by neighbouring CD8(+) T-cells. We investigated PI-9 expression in lung cancer cell lines, and primary lung cancer cells obtained at curative lung resection from cancer patients with/without chronic obstructive pulmonary disease (COPD). Granzyme B and PI-9 expression was also determined in CD8(+) T-cells from the cancer and non-cancer areas of resected lung tissue and from bronchoalveolar lavage (BAL). We then evaluated the effects of conditioned media from lung cancer cell lines on granzyme B expression and the cytotoxic activity of CD8(+) T-cells. PI-9 was highly expressed in lung cancer cell lines. Increased PI-9 expression was also observed in primary cancer cells vs. epithelial cells from non-cancer tissue or bronchial brushing-derived normal primary large airway epithelial cells. Expression significantly correlated with cancer stage. Significantly reduced granzyme B was noted in CD8(+) T-cells from cancer vs. non-cancer tissue. Granzyme B production by CD8(+) T-cells was reduced in the presence of conditioned media from lung cancer cell lines. Our data suggest that lung cancer cells utilise their increased PI-9 expression to protect from granzyme B-mediated cytotoxicity as an immune evasion mechanism, a function that increases with lung cancer stage." @default.
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• W2021002328 date "2012-07-01" @default.
• W2021002328 modified "2023-09-27" @default.
• W2021002328 title "Increased proteinase inhibitor-9 (PI-9) and reduced granzyme B in lung cancer: Mechanism for immune evasion?" @default.
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• W2021002328 doi "https://doi.org/10.1016/j.lungcan.2012.01.017" @default.
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