RÉSUMÉ
@#[Abstract] Objective: To explore the effect and mechanism of splicing factor 3b subunit 6 (SF3b6) on the proliferation, apoptosis, invasion and migration of gastric cancer cells. Methods: Tissue microarrays were used to detect the expression of SF3b6 in gastric cancer tissues and adjacent tissues. WB and qPCR were used to detect the expression of SF3b6 in normal immortalized gastric epithelial cells (GES-1) and gastric cancer cell lines (HGC27, AGS, BGC823, MGC803, SGC7901, MKN45). AGS and MGC803 cells were transfected with SF3b6 siRNA, and BGC823 and SGC7901 cells were transfected with SF3b6 over-expression plasmid for functional experiments. CCK-8 assay was used to detect the regulation of SF3b6 on the proliferation of gastric cancer cells; Transwell migration and invasion experiments were used to detect the effect of SF3b6 on the migration and invasion of gastric cancer cells; Flow cytometry was used to detect cell apoptosis; and WB was adopted to detect expressions of apoptosis and migration-related molecules and MAPK signaling pathway associated proteins. Results: The expression level of SF3b6 in gastric cancer MGC803 and AGS cells was significantly higher while in BGC823 and SGC7901 cells was significantly lower than that in normal gastric epithelial GES-1 cells (P<0.05 or P<0.01). SF3b6 knockdown inhibited the proliferation, migration and invasion, but promoted cell apoptosis of gastric cancer cell lines AGS and MGC803 (P<0.05 or P<0.01); However, over-expression of SF3b6 promoted the proliferation, migration and invasion of gastric cancer cell lines BGC823 and SGC7901 (P<0.05 or P<0.01). Mechanism study showed that SF3b6 knockdown promoted the activation of JNK and p38 and expression of apoptosis-related protein cleaved caspase-9, cleaved PARP and Bax (P<0.05 or P<0.01), and meanwhile inhibited the process of epithelial to mesenchymal transition (EMT) in gastric cancer cells. Conclusion: The splicing factor SF3b6 enhances cell proliferation and migration via MAPK signaling pathway, thereby promoting tumor progression.
RÉSUMÉ
@# Objective: To explore the effect of shRNA interfering BAMBI (bone morphogenetic protein and activin membrane bound inhibitor) on the proliferation, apoptosis, invasion and migration of human colon cancer SW480 cells and the possible mechanisms. Methods: After successful transfection with sh-BAMBI in SW480 cells, the mRNA and protein epxressions of BAMBI were detected by qRT-PCR and Western blotting, respectively. Cell proliferation was measured by MTT; apoptosis was tested by Hoechst33258 staining; cell invasion was detected by transwell assay; and cell migration was measured by wound healing assay. The expressions of TGF-β/ Smad/2 signaling pathway related proteins were detected by Western blotting. Results: The mRNA and protein levels of BAMBI in shBAMBI group were lower than those of control group (P<0.05). Compared with control group, cell proliferation in sh-BAMBI group was obviously decreased (P<0.05), while apoptosis was obviously increased (P<0.01); in the meanwhile, cell invasion and migration in sh-BAMBI group were significantly reduced (P<0.05). In addition, the protein level of TGF-β and the ratio of p-Smad/2/ Smad/2 in shBAMBI group were significantly higher than those in control group (P<0.05). Conclusion: Interference of BAMBI by shRNA inhibits proliferation, invasion and migration but induces apoptosis of human colon cancer SW480 cells and activates TGF-β/Smad/2 pathway.
RÉSUMÉ
In this retrospective cohort study conducted in 63 children with idiopathic thrombocytopenic purpura (ITP) in China; petechiae, bruises and bleeding were the major presentations. Most cases required therapy with one/more treatment options.