World journal of gastroenterology · 2003
In situ expression and significance of B7 costimulatory molecules within tissues of human gastric carcinoma.
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Chen Xiao-Li, Cao Xu-Dong, Kang An-Jing, Wang Kang-Min, Su Bao-Shan, Wang Yi-Li
Аннотация
AIM: To explore the role and significance of costimulatory molecules B7H1,B7H2 and ICOS within tissues of human gastric carcinoma and the possible mechanisms in tumor escape.
METHODS: mRNA expressions of costimulatory molecules including B7H1,B7H2,ICOS and B7-1 in tissues of human gastric carcinoma were investigated by in situ hybridization using digoxigenin-labeled oligonucleotide-probes. The tissue of chronic gastric ulcer was used as a control. All data were analyzed by SPSS statistic software.
RESULTS: At the site of gastric carcinoma, mRNA expression levels of B7H1, B7H2 and ICOS were much higher than that of B7-1. Their mRNA positive expression indexes were 0.512+/-0.333, 0.812+/-0.454, 0.702+/-0.359 and 0.293+/-0.253, respectively. The positively stained cells were mainly tumor infiltrating lymphocytes (TILs), and some tumor cells. The difference between them was greatly significant P<0.005. The mRNA expression levels of four molecules were not correlated to the pathological grade and matastasis of gastric carcinoma.
CONCLUSION: ICOS-B7H costimulatory pathway may be predominant at the site of gastric carcinoma. B7-1mRNA might be the basis of ICOS-B7H interaction. ICOS-B7H interaction induces the production of IL-10 which inhibits the antitumor immune responses. Therefore, it is supposed that ICOS-B7H costimulatory pathway may be involved in the negative regulation of cell-mediated immune responses.
METHODS: mRNA expressions of costimulatory molecules including B7H1,B7H2,ICOS and B7-1 in tissues of human gastric carcinoma were investigated by in situ hybridization using digoxigenin-labeled oligonucleotide-probes. The tissue of chronic gastric ulcer was used as a control. All data were analyzed by SPSS statistic software.
RESULTS: At the site of gastric carcinoma, mRNA expression levels of B7H1, B7H2 and ICOS were much higher than that of B7-1. Their mRNA positive expression indexes were 0.512+/-0.333, 0.812+/-0.454, 0.702+/-0.359 and 0.293+/-0.253, respectively. The positively stained cells were mainly tumor infiltrating lymphocytes (TILs), and some tumor cells. The difference between them was greatly significant P<0.005. The mRNA expression levels of four molecules were not correlated to the pathological grade and matastasis of gastric carcinoma.
CONCLUSION: ICOS-B7H costimulatory pathway may be predominant at the site of gastric carcinoma. B7-1mRNA might be the basis of ICOS-B7H interaction. ICOS-B7H interaction induces the production of IL-10 which inhibits the antitumor immune responses. Therefore, it is supposed that ICOS-B7H costimulatory pathway may be involved in the negative regulation of cell-mediated immune responses.