ABSTRACT
Objective To detect the expression of interlenkin-22 (IL-22) and relative CD4+ T cell subsets in patients with ulcerative colitis (UC),and to explore their roles in the pathogenesis of UC.Methods Thirty-five adult UC patients were enrolled in this study and 35 healthy subjects were taken as control.Plasma IL-22 level was quantified by ELISA.The percentages of Th1,Th17 and Th22 cells in peripheral blood were determined by flow cytometry.The relationships of these results and disease activity were analyzed.Results Plasma IL-22 levels in UC patients [ (354.12±104.22 ) pg/ml ]were significantly higher than that of healthy controls ( P＜0.05 ),and the levels increased significantly in severely active patients.The percentages of Th17 cells in UC patients [ (2.36±0.94) ％ ]were elevated compared to healthy controls ( P＜0.05 ),and the percentages increased significantly in moderately active and severely active patients.The percentages of Th22 cells in UC patients [ (2.27±0.87 ) ％ ]were elevated compared to healthy controls (P±0.05),and the percentages increased significantly in severely active patients.The percentage of Th1 cells was not significantly different between UC patients and normal controls.ConclusionOur resuits demonstrate elevated IL-22 correlated to Th17 and Th22 cells may play an important role in the immunopathogenesis of UC.
ABSTRACT
Objective:To investigate the inhibitory effect of RXRγ and RARβ on the growth of human gastric carcinoma cell line SGC7901 treated by RXR agonist(9-cis-RA). Methods:The human gastric carcinoma cell line SGC7901 was treated with 9-cis-RA, and then the morphological changes were observed by H-E staining. The cell growth was detected by MTT assay. The apoptosis and the cell cycle progression were analyzed by flow cytometry. The expressions of RXRγ and RARβ were detected by immunocytochemistry staining and western-blot assay. Results: HE stain showed that the SGC7901 cells were sparser with the increasing concentration of 9-cis-RA. The growth of SGC7901 cell was inhibited by 9-cis-RA at the concentration of 20 μmol/L in time and dose depended manner. The apoptotic rate of the tumor cells increased after 72 hours at the concentration of 20 μmol/L 9-cis-RA and the tumor cells were arrested in G0/G1 phase. Immunocytochemistry and Western-blot assay showed that the expressions of RXRγ and RARβ increased after 72 hours, compared with those of negative control group. Conclusion: RXR agonist 9-cis-RA can inhibit the growth of SGC7901 cells via inducing cell apoptosis through upgrading the expressions of RXRγ and RARβ.