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目的:探讨紫花牡荆素(CAS)对膀胱癌T24细胞增殖、迁移和侵袭的影响及作用机制。方法:体外培养T24细胞，分为对照组、5、10、20 μmol/L CAS组、si-NC组、si-TM7SF4组、CAS+pcDNA组和CAS+pcDNA-TM7SF4组，采用细胞计数试剂盒8(CCK-8)法检测各组细胞的增殖抑制情况，Transwell法检测细胞迁移和侵袭的能力，Western blot法检测细胞中细胞周期蛋白D1(cyclin D1)、p21、基质金属蛋白酶2(MMP-2)、MMP-9和7次跨膜超蛋白家族成员4(TM7SF4)蛋白的表达水平，实时荧光定量PCR检测TM7SF4 mRNA的表达水平。结果:5、10、20 μmol/L CAS组T24细胞增殖抑制率分别为(17.68±1.41)%、(33.54±3.16)%和(61.44±5.50)%，均高于对照组[(0.00±0.00)%，均n P<0.001]。5、10、20 μmol/L CAS组细胞迁移数分别为(72.83±5.66)个、(59.13±4.27)个和(41.25±3.22)个，细胞侵袭数分别为(55.83±5.15)个、(42.19±3.06)个和(31.13±3.22)个，均低于对照组[分别为(86.11±5.16)个和(68.82±5.29)个，均n P<0.001]。5、10、20 μmol/L CAS组T24细胞中cyclin D1、MMP-2、MMP-9、TM7SF4蛋白表达水平、TM7SF4 mRNA表达水平均低于对照组(均n P<0.001)，p21蛋白表达水平高于对照组(n P<0.001)。si-TM7SF4组T24细胞增殖抑制率[(50.35±4.67)%]高于si-NC组[(6.31±0.58)%，n P<0.001]，si-TM7SF4组细胞迁移数[(53.51±4.18)个]和细胞侵袭数[(42.92±3.81)个]均低于si-NC组[分别为(85.26±4.99)个和(67.93±4.64)个，均n P<0.001]。si-TM7SF4组T24细胞中TM7SF4、cyclinD1、MMP-2和MMP-9蛋白表达水平均低于si-NC组(均n P<0.001)，p21蛋白表达水平高于si-NC组(n P<0.001)。CAS+pcDNA-TM7SF4组T24细胞增殖抑制率[(21.45±2.46)%]低于CAS+pcDNA组[(64.06±4.49)%，n P<0.001]，CAS+pcDNA-TM7SF4组细胞迁移数[(75.66±6.57)个]和侵袭数[(59.35±5.40)个]均高于CAS+pcDNA组[分别为(40.43±3.85)个和(30.25±3.32)个，均n P<0.001]。CAS+pcDNA-TM7SF4组T24细胞中TM7SF4、cyclinD1、MMP-2和MMP-9蛋白表达水平均高于CAS+pcDNA组(均n P<0.001)，p21蛋白表达水平低于CAS+pcDNA组(n P<0.001)。n 结论:CAS可能通过抑制TM7SF4表达抑制膀胱癌T24细胞增殖、迁移和侵袭。“,”Objective:To explore the effect and mechanism of Casticin (CAS) on the proliferation, migration and invasion of bladder cancer T24 cells.Methods:T24 cells were cultured in vitro and divided into control group, 5, 10, 20 μmol/L CAS groups, si-NC group, si-TM7SF4 group, CAS+ pcDNA group and CAS+ pcDNA-TM7SF4 group. Cell counting kit-8 (CCK-8) was used to detect cell proliferation; Transwell was used to detect cell migration and invasion; western blot was used to detect the protein expressions of cyclin D1, p21, MMP-2, MMP-9 and TM7SF4, and real-time quantitative reverse transcription polymerase chain reaction (RT-qPCR) was used to detect the expression of TM7SF4 mRNA.Results:The inhibition rates of T24 cells in the 5, 10, 20 μmol/L CAS groups were (17.68±1.41)%, (33.54±3.16)% and (61.44±5.50)%, respectively, higher than (0.00±0.00)% of the control group ( n P<0.001), but the numbers of migration and invasion were 72.83±5.66, 59.13±4.27, 41.25±3.22 and 55.83±5.15, 42.19±3.06, 31.13±3.22, respectively, lower than 86.11±5.16 and 68.82±5.29 of the control group (n P<0.001). The protein expression levels of cyclin D1, MMP-2, MMP-9, TM7SF4 and the expression levels of TM7SF4 mRNA in the 5, 10, and 20 μmol/L CAS groups were lower than the control group (n P<0.001). However, the protein expression levels of p21 were 0.37±0.03, 0.51±0.04, and 0.66±0.06, respectively, higher than 0.25±0.03 in the control group (n P<0.001). The inhibition rate of T24 cells in the si-TM7SF4 group was (50.35±4.67)%, higher than (6.31±0.58)% in the si-NC group (n P<0.001), but the numbers of migration and invasion were 53.51±4.18 and 42.92±3.81, lower than 85.26±4.99 and 67.93±4.64 of the si-NC group (n P<0.001). The protein expression levels of TM7SF4, CyclinD1, MMP-2, MMP-9 in the si-TM7SF4 group were lower than the si-NC group (n P<0.001). However, the protein expression level of p21 in the si-TM7SF4 group was higher than the si-NC group (n P<0.001). The inhibitory rate of T24 cells in the CAS+ pcDNA-TM7SF4 group was (21.45±2.46)%, lower than (64.06±4.49)% of the CAS+ pcDNA group (n P<0.001), but the number of migration and invasion in the CAS+ pcDNA-TM7SF4 group were 75.66±6.57 and 59.35±5.40, higher than 40.43±3.85 and 30.25±3.32 in the CAS+ pcDNA group (n P<0.001). The protein expression levels of TM7SF4, CyclinD1, MMP-2 and MMP-9 in the CAS+ pcDNA-TM7SF4 group were higher than the CAS+ pcDNA group (n P<0.001), but the protein expression level of p21 was lower than the CAS+ pcDNA group (n P<0.001).n Conclusion:CAS may suppress the proliferation, migration and invasion of bladder cancer T24 cells by inhibiting the expression of TM7SF4.