趋化因子及其受体在人早孕绒毛组织中的表达特征及意义

Expressions of CL16/CR6 and CL12/CR4 in first-trimester human trophoblast cells

目的探讨人早孕绒毛组织中趋化因子CXCL16、CXCL12及其受体CXCR6、CXCR4的基因转录和蛋白表达特征。方法收集早孕绒毛组织并分离滋养细胞,采用半定量RT-PCR方法,检测人早孕绒毛滋养细胞(含绒毛滋养细胞和绒毛外滋养细胞)和人绒毛膜细胞癌细胞系JAR中CXCL16、CXCR6、CXCL12、CXCR4的基因转录水平;采用免疫组化和免疫细胞化学分析方法,检测人早孕绒毛滋养细胞及JAR细胞中CXCL16、CXCR6、CXCL12、CXCR4的蛋白表达。结果人早孕绒毛滋养细胞CXCL16、CXCR6、CXCL12、CXCR4的基因转录水平分别为0·89±0·11、1·12±0·25、0·78±0·10、1·08±0·11;JAR细胞CXCL16、CXCR6、CXCL12、CXCR4的基因转录水平分别为0·90±0·21、1·00±0·30、0·66±0·13、0·90±0·18,两者比较,差异无统计学意义(P>0·05)。CXCL16、CXCR6、CXCL12、CXCR4蛋白在人早孕绒毛滋养细胞和绒毛外滋养细胞中的表达均呈阳性。结论人早孕绒毛滋养细胞同时表达CXCL16、CXCL12、CXCR6、CXCR4,提示母-胎界面存在复杂的趋化因子调控网络,并参与调控滋养细胞自身的生物学行为。

Objective To investigate the transcription and protein expressions of chemokines CXCL16, CXCL12 and their receptors CXCR6, CXCR4 in first-trimester human cytotrophoblast cells and human choriocarcinoma cell line JAR. Methods Transcriptions of CXCR6, CXCL16, CXCR4, CXCL12 in purified first-trimester human trophoblast cells and JAR line were assessed by semi-quantitative RT-PCR, and protein expressions of CXCR6, CXCL16, CXCR4, CXCL12 were analyzed in primary cultured villous cytotrophoblasts （ VCT）, extravillous cytotrophoblasts （ EVCT）, JAR line and placentas by immunostaining. Results CXCR6 and CXCR4 were highly transcribed in primary cultured trophoblast cells with mRNA relative level of 1.12 ± 0. 25 and 1.08 ± 0. 11 respectively, and their ligands CXCL16 and CXCL12 were transcribed moderately with mRNA relative level of 0. 89 ± 0. 11 and 0. 78 ± 0. 10 respectively. It was demonstrated that CXCL16, CXCL12, CXCR6 and CXCR4 were expressed in primary cultured VCT, EVCT, JAR line and placentas by immunostaining. Conclusion The co-expression of CXCL16/CXCR6 and CXCL12/CXCR4 in trophoblast cells may play a role in the proliferation and differentiation of firsttrimester trophoblast cells in a manner of autocrine.