姜黄素对骨髓瘤细胞迁移和侵袭能力的影响及其机制研究

 目的：探讨姜黄素对骨髓瘤细胞迁移侵袭能力的影响及其机制。方法：shRNA表达质粒沉默含IQ模序的RasGTP酶活化蛋白1(IQ motif-containing GTPase-activating protein 1，IQGAP1)后转染RPMI8226细胞，Western blotting法检测RPMI8226-shIQGAP1组、RPMI8226-shRNA阴性对照组和未转染RPMI8226组细胞IQGAP1表达；不同浓度姜黄素作用于各组细胞后，Transwell迁移实验和Matrigel侵袭实验检测细胞的迁移及侵袭力,RT-PCR法检测姜黄素作用后IQGAP1 mRNA的表达,Western blotting检测姜黄素对各组细胞IQGAP1蛋白表达的影响。结果：使用shRNA表达质粒沉默IQGAP1后，RPMI8226细胞IQGAP1表达减少；RPMI8226-shIQGAP1组较RPMI8226-shRNA 阴性对照组和未转染RPMI8226 组细胞迁移及侵袭力下降，姜黄素可降低RPMI8226-shRNA 阴性对照组和未转染RPMI8226组细胞迁移及侵袭力，无浓度相关性，不同浓度的姜黄素对RPMI8226-shIQGAP1组作用后细胞的迁移及侵袭力无明显变化。对于RPMI8226-shRNA阴性对照组及未转染RPMI8226组，姜黄素作用后IQGAP1 mRNA及蛋白的表达下降。结论：姜黄素通过抑制IQGAP1的表达降低骨髓瘤细胞的迁移力和侵袭力。

Effects of curcumin on migration and invasion of myeloma cells

AIM：To explore the effect of curcumin on the migratory and invasive abilities of myeloma cells. METHODS：shRNA expression plasmid was transfected into RPMI8226 cells to knock down IQ motif-containing GTPase-activating protein 1 (IQGAP1). The expression of IQGAP1 in RPMI8226 cells tranfected with shIQGAP1 or shRNA negative control, and in un-transfected RPMI8226 cells was detected by Western blotting. All the cells in RPMI8226-shIQGAP1 group, RPMI8226-shRNA negative control group and un-transfected RPMI8226 group were treated with curcumin at various concentrations. The migratory and invasive abilities of the RPMI8226 cells were measured by Transwell chamber and Matrigel assays. The expression of IQGAP1 at mRNA and protein levels in the RPMI8226 cells treated with curcumin was also determined by RT-PCR and Western blotting. RESULTS：The expression of IQGAP1 decreased when IQGAP1 gene was knocked down by shRNA. The migration and Matrigel invasion tests showed that the number of cells moving into under chamber of Transwell decreased in RPMI8226-shIQGAP1 group in comparison with the other 2 groups. Curcumin decreased the migratory and invasive abilities of RPMI8226-shRNA negative control cells and un-transfected RPMI8226 cells, which was not related to the curcumin concentratory. The migratory and invasive abilities of RPMI8226-shIQGAP1 cells showed no significant difference when treated with curcumin at various concentrations. The expression of IQGAP1 at mRNA and protein levels decreased in the RPMI8226 cells treated with curcumin. CONCLUSION：Curcumin decreases the migratory and invasive abilities of myeloma cells via inhibition of IQGAP1 expression.