title: Expression of the genes encoding human leucocyte antigens-A, -B, -DP, -DQ and -G in gastric cancer patients.
abstract: This study compared the expression of the genes encoding human leucocyte antigens (HLA)-A, -B, -DP, -DR and -G in peripheral blood mononuclear cells (PBMCs) in gastric cancer patients and healthy controls. Using reverse transcription-polymerase chain reaction, levels of classical HLA-A, -B, -DP and -DR and non-classical HLA-G mRNA were studied in 43 gastric cancer patients and 22 controls. In addition, the levels of HLA-A,B,C and -G antigens on the surface of PBMCs were measured in 30 gastric cancer patients and 15 controls using flow cytometry. The mean fluorescence intensity of HLA-A,B,C antigen in the gastric cancer group was significantly lower than in controls. The HLA-G antigen was mainly present on CD4(+)CD8(-) T-lymphocytes. The percentage of CD4(+)CD8(-) T-lymphocytes positive for HLA-G antigen was significantly lower in the gastric cancer group compared with the healthy controls. Levels of HLA-A, -B and -G mRNA in the gastric cancer group were significantly lower than in controls. The HLA-G mRNA levels were significantly lower in gastric cancer of histological grades III and IV than in grades I and II. These data may provide a novel diagnostic and research tool for gastric cancer.
authors.affiliation: Department of Clinical Laboratory Medicine, Qilu Hospital of Shandong University, Jinan, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.forename: N
authors.initials: N
authors.lastname: Lu
authors.forename: N N
authors.initials: NN
authors.lastname: Shan
authors.forename: G X
authors.initials: GX
authors.lastname: Zheng
authors.forename: S M
authors.initials: SM
authors.lastname: Zhao
authors.forename: X
authors.initials: X
authors.lastname: Zou
authors.forename: Y J
authors.initials: YJ
authors.lastname: Gao
authors.forename: Y J
authors.initials: YJ
authors.lastname: Li
authors.forename: Y S
authors.initials: YS
authors.lastname: Wang
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics* / Q000556:secondary; D000328:Adult; D000368:Aged; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D005260:Female; D005434:Flow Cytometry; D015870:Gene Expression; D006680:HLA Antigens / Q000235:genetics*; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000737:chemistry / Q000276:immunology; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D012333:RNA, Messenger / Q000378:metabolism; D013274:Stomach Neoplasms / Q000235:genetics* / Q000473:pathology
chemical_list: D006680:HLA Antigens; D012333:RNA, Messenger