摘要目的 研究SDF-1/CXCR4轴对人绒毛膜癌细胞株JAR细胞侵袭、迁移能力的影响及AMD3100对CXCR4的阻断作用,同时研究对下游PI3K/AKT信号通路的影响作用,进而探讨SDF-1/CXCR4轴在子痫前期发病中的作用机制.方法 将JAR细胞分为4组:AMD3100处理组(100 ng/ml)、SDF-1处理组(50 ng/ml)、SDF-1+AMD3100混合组(100 ng/ml AMD3100孵育2 h后再加入50 ng/ml SDF-1)、空白对照组.RT-PCR检测SDF-1和AMD3100处理后JAR细胞中CXCR4 mRNA表达水平的变化;Western blot 检测CXCR4及下游p-AKT蛋白的表达水平.采用MTT增殖试验,在0 h、24 h、48 h、72 h时间点分别检测不同浓度的SDF-1(10、30、50、100 ng/ml)对JAR细胞增殖能力的促进作用;Transwell侵袭试验、划痕试验分别检测不同处理因素条件下4组JAR细胞侵袭和迁移能力的变化情况.结果 (1)RT-PCR结果显示:SDF-1处理组JAR细胞中CXCR4 mRNA的表达(1.839±0.083)明显高于空白对照组(1.372±0.086)、AMD3100处理组(0.694±0.045)、SDF-1+AMD3100混合组(0.703±0.093),差异有统计学意义(F=30.67,P<0.05);与空白对照组比较,AMD3100处理组JAR细胞中CXCR4 mRNA的表达显著降低,差异有统计学意义(P<0.01).(2)Western blot结果显示SDF-1处理组JAR细胞中CXCR4及p-AKT蛋白表达水平明显高于空白对照组、AMD3100处理组、SDF-1+AMD3100混合组;与空白对照组比较,AMD3100处理组JAR细胞中CXCR4及p-AKT蛋白表达水平显著降低.(3)MTT结果显示:与10、30、100 ng/ml浓度的SDF-1处理组相比,50 ng/ml SDF-1对JAR细胞的促增殖作用最强;且在48 h时,促增殖效应最大,与调零组及空白对照组比较差异均有统计学意义(P<0.05).(4)Transwell侵袭试验显示:SDF-1组侵袭细胞数(70.49 ± 2.42)明显多于空白对照组(54.36±2.26)、AMD3100处理组(21.68±8.31)、SDF-1+AMD3100混合组(28.18±4.61),差异有统计学意义(F=116.26,P<0.01);与空白对照组比较,AMD3100处理组侵袭细胞数显著减少,差异有统计学意义(P<0.05).(5)划痕试验结果显示,24 h之后,SDF-1组相对迁移距离(1.162±0.034)明显高于空白对照组(0.823±0.101)、AMD3100处理组(0.160±0.047)、SDF-1+AMD3100混合组(0.183±0.064),差异有统计学意义(F=30.500,P<0.05);与空白对照组比较,AMD3100处理组相对迁移距离显著减少,差异有统计学意义(P<0.01).结论SDF-1可增强人绒毛膜癌细胞株JAR的侵袭、迁移能力,但能被AMD3100阻断,因此推测在子痫前期发病过程中SDF-1/CXCR4轴可能受到抑制,并引起下游PI3K/AKT信号通路活化异常,进而引起滋养细胞的增殖异常、侵袭迁移不足,导致胎盘形成异常.

abstractsObjective To investigate the effects of stromal cell-derived factor 1 (SDF-1) and an CXC chemokine receptor 4 (CXCR4) antagonist (AMD3100) on the invasion and migration capabilities of the huaman choriocarcinoma cell line JAR for further elucidating the role of SDF-1/CXCR4 axis in the pathogenesis of preeclampsia.Methods JAR cells were divided into four groups: SDF-1 group (treated with 50 ng/ml of SDF-1),SDF-1+AM3100 mixed group (first treated with 100 ng/ml of AMD3100 for 2 hours and then treated with 50 ng/ml of SDF-1),AMD3100 group (treated with 100 ng/ml of AMD3100) and blank control group (without any treatment).RT-PCR was performed to detect the expression of CXCR4 at mRNA level in JAR cells.Western blot assay was used to measure the expression of CXCR4 and p-AKT at protein level.MTT assay was used to analyze the effects of different concentrations of SDF-1 (10,30,50 and 100 ng/ml) on the proliferation of JAR cells at different time points (0,24,48,72 h).Transwell invasion assay and wound-healing assay were used to test the changes in invasion and migration capabilities of JAR cells after different treatments.Results (1) Results of the RT-PCR showed that the expression of CXCR4 at mRNA level in JAR cells was increased in the SDF-1 group (1.839±0.083) as compared with that in the blank control group (1.372±0.086),AMD3100 group (0.694±0.045) or SDF-1+AM3100 mixed group (0.703±0.093).Moreover,the differences between the SDF-1 group and the other three groups were statistically significant (F=30.67,P<0.05).Compared with the blank control group,the expression of CXCR4 at mRNA level in JAR cells was decreased in the AMD3100 group (P<0.01).(2) Results of the Western blot assay showed that the expression of CXCR4 and p-AKT at protein level in JAR cells were enhanced in the SDF-1 group as compared with that in the blank control group,AMD3100 group or SDF-1+AM3100 mixed group.Compared with the blank control group,the expression of CXCR4 and p-AKT at protein level in JAR cells were inhibited in the AMD3100 group.(3) Results of the MTT assay showed that SDF-1,especially at the concentration of 50 ng/ml,could enhance the proliferation of JAR cells (P<0.05) and its best effect on proliferation was seen at 48 h.(4) Results of the Transwell invasion assay showed that the number of transmembrane cells in the SDF-1 group (70.49±2.42) was more than that in the blank control group (54.36±2.26),AMD3100 group (21.68±8.31),or SDF-1+AMD3100 mixed group (28.18±4.61).The differences between the SDF-1 group and the other three groups were statistically significant (F=116.26,P<0.01).Compared with the blank control group,the number of transmembrane cells was reduced in the AMD3100 group (P<0.05).(5) Results of the wound-healing assay showed that the relative migration distance was increased in the SDF-1 group (1.162±0.034) as compared with that in the blank control group (0.823±0.101),AMD3100 group (0.160±0.047),or SDF-1+AMD3100 mixed group (0.183±0.064).The differences between the SDF-1 group and the other three groups were statistically significant (F=30.500,P<0.05).Compared with the blank control group,the relative migration distance was decreased in the AMD3100 group (P<0.01).Conclusion The invasion and migration of huaman choriocarcinoma JAR cells can be enhanced by SDF-1,but inhibited by AMD3100.This study indicates that the blocked biological axis of SDF-1/CXCR4 may play an important role in the pathogenesis of preeclampsia through inducing abnormal activation of PI3K/AKT pathway,which results in inhibited invasion and migration of trophoblast cells and placenta abnormality.