title: Expression of MG7-Ag in patients with gastric cancer correlates with weaker T cell immune response and more proinflammatory cytokine secretion.
abstract: MG7-Ag is a human gastric-carcinoma-associated antigen with a high specificity. So far it is remained unclear whether MG7-Ag is correlated with the in vivo cellular immune response of patients with gastric cancer. In this study, we detected the expression of the T cell receptor (TCR) repertoire of T cell subpopulations and cytokines in tumor-infiltrating lymphocytes (TIL), peripheral blood lymphocytes (PBL), and residue benign mucosal lymphocytes (NML) of patients with gastric cancer using semiquantitative RT-PCR. Our data showed that the expanded clones in CD8(+) NML and TIL and CD4+ NML and PBL in MG7-Ag-positive patients were significantly fewer than those of MG7-Ag-negative patients (p = 0.0360; p = 0.0026; p = 0.0065 p = 0.0109, respectively). The levels of IL-8 in CD8(+) TIL and TNF in CD4(+) TIL from the MG7-Ag-positive group were significantly higher than those from the MG7-Ag-negative group (p = 0.0302; p = 0.0177, respectively). Taken together, the results demonstrated a weaker T cell immune response and more proinflammatory cytokine secretion in MG7-Ag-positive patients with gastric cancer than in MG7-Ag-negative ones. This likely contributes to the poor prognosis in MG7-Ag-positive gastric-cancer patients.
authors.affiliation: State Key Laboratory of Cancer Biology, Institute of Digestive Diseases, Xijing Hospital, 4th Military Medical University, Xian, PR China.
authors.forename: Xiaoyin
authors.initials: X
authors.lastname: Zhang
authors.forename: Liu
authors.initials: L
authors.lastname: Hong
authors.forename: W Y
authors.initials: WY
authors.lastname: Chan
authors.forename: Taidong
authors.initials: T
authors.lastname: Qiao
authors.forename: Baojun
authors.initials: B
authors.lastname: Chen
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.forename: Daiming
authors.initials: D
authors.lastname: Fan
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000951:Antigens, Neoplasm / Q000378:metabolism*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D016207:Cytokines / Q000096:biosynthesis* / Q000235:genetics; D006801:Humans; D018836:Inflammation Mediators / Q000378:metabolism; D008875:Middle Aged; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012334:RNA, Neoplasm / Q000235:genetics / Q000378:metabolism; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics; D013274:Stomach Neoplasms / Q000235:genetics / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000951:Antigens, Neoplasm; D016207:Cytokines; D018836:Inflammation Mediators; C508753:MG7 antigen, human; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D016693:Receptors, Antigen, T-Cell, alpha-beta