侵袭转移相关因子在胃肠道间质瘤中的检测及其意义

SiRNA-mediated silencing of the CXCR4 gene down-regulates MMP-9 expression in EC-9706 cells

AIM: To investigate the effect of small interfering RNA (siRNA)-mediated blockade of CXCR4 signaling on the expression of MMP-9 in human esophageal carcinoma cell line EC9706 and to provide an experimental foundation for further elucidating the role of CXCR4 in metastasis and invasion of esophageal carcinoma (ESCC).

METHODS: Two siRNAs targeting the CXCR4 gene and one fluorescence-labeled negative control siRNA were chemically synthesized and transfected into EC9706 cells, Non-transfected EC9706 cells were used as blank controls. The transfection efficiency was evaluated by fluorescence microscopy. Both CXCR4 and MMP-9 mRNA and protein levels were detected by semiquantitative RT-PCR and Western blot 48 h after transfection. Boyden chamber assay was used to evaluate the invasion capability of cells in vitro and MTT assay was used to evaluate cell growth.

RESULTS: The two siRNAs targeting the CXCR4 gene efficiently suppressed the expression of CXCR4 in EC9706 cells at both mRNA and protein levels compared to negative and blank controls (all P < 0.05). The expression of MMP-9 mRNA and protein in EC9706 cells transfected with the two siRNAs targeting the CXCR4 gene was also suppressed significantly compared to the two control groups (all P < 0.05). Boyden chamber assay results showed that the number of cells that have passed through the membrane were decreased in EC-9706 cells transfected with two CXCR4-specific siRNAs compared to the two control groups (both P < 0.05). Transfection of CXCR4-specific siRNAs greatly decreased the growth of EC9-706 cells compared to control cells (both P < 0.05).

CONCLUSION: CXCR4 may play a role in the metastasis and invasion of ESCC possibly by controlling the expression of MMP-9. CXCR4 may be a potentially valuable therapeutic target for ESCC.

Oxymatrine inhibits MMP-2 expression and reduces cell invasion in human pancreatic carcinoma cell line SW1990

AIM: To examine the effects of treatment with oxymatrine (OM) on MMP-2 expression and cell invasion in human pancreatic carcinoma cell line SW1990.

METHODS: Cultured SW1990 cells were randomly divided into two groups: control group and OM group. The OM group was further divided into three subgroups, which were treated with three different doses of OM (1, 2 and 4 g/L). MMP-2 expression in SW1990 cells was analyzed by real-time RT-PCR. Cell invasion, migration and proliferation were measured by scratch assay, transwell invasion assay and MTT assay, respectively.

RESULTS: The expression levels of MMP-2 mRNA in SW1990 cells in the three OM subgroups were significantly lower than that in the control group (0.53 ± 0.03, 0.42 ± 0.02, 0.29 ± 0.03 vs 0.70 ± 0.03, all P < 0.05). The invasion of cells in the three OM subgroups was markedly lower than that in the control group (325 ± 64.43, 206 ± 84.76, 124 ± 46.78 vs 498 ± 78.54, all P < 0.05). The mobility of cells in the three OM subgroups was also significantly lower than that in the control group (385.0 ± 58.9, 287.0 ± 79.8, 186.0 ± 60.9 vs 586.0 ± 85.8, all P < 0.05).

CONCLUSION: OM reduces the invasion of SW1990 cells possibly by inhibiting the expression of MMP-2.