C3aR慢病毒表达载体的构建及在肾小管上皮细胞中的转染实验

Construction of a C3aR expression vector and infection in tubular epithelial cells

目的前期研究发现C3aR在糖尿病肾病肾小管上皮细胞中表达上调,但其在糖尿病肾病中的病理意义未知,且有关肾组织C3aR的确切生理和病理意义亦仍不清楚。文中通过构建C3aR慢病毒表达载体和过表达C3aR的肾小管上皮细胞株,为探讨C3aR在肾组织小管上皮细胞中的确切生理和病理意义提供细胞模型。方法根据人C3aR mRNA序列合成人C3aR基因,将其克隆到慢病毒表达载体p Lenti6.3-MCS-IRES2-EGFP的多克隆位点,构建成C3aR慢病毒表达载体p Lenti6.3-C3aR-IRES2-EGFP;经测序验证正确后,用构建的慢病毒表达载体p Lenti6.3-C3aR-IRES2-EGFP和包装质粒共转染293T细胞,包装成C3aR表达重组慢病毒;以C3aR表达重组慢病毒感染人肾小管上皮细胞系HK2,经药物筛选得到杀稻瘟菌素抗性细胞克隆;经荧光定量PCR分析和细胞免疫化学分析,鉴定出稳定过表达C3aR的人肾小管上皮细胞株。结果 1对构建成的C3aR慢病毒表达载体p Lenti6.3-C3aR-IRES2-EGFP进行全序列测序验证显示序列完全正确。2以构建的C3aR慢病毒表达载体和包装质粒(p LP1、p LP2和p LP/VSVG)共转染293T细胞,48 h后收集细胞培养上清,得到了滴度约为5×108个/m L的慢病毒液。3成功进行了C3aR重组慢病毒对HK2细胞的转染,得到了稳定转染了C3aR重组慢病毒的HK2细胞株HK2-C3aR;基于荧光定量PCR和细胞免疫化学染色的分析证实HK2-C3aR细胞株中C3aR表达水平较HK2非转染对照细胞高(2.33±0.45 vs 1.00±0.09,P<0.05)。结论成功构建了C3aR慢病毒表达载体和过表达C3aR的人肾小管上皮细胞株,为进一步研究C3aR过表达在人肾小管上皮细胞中的病理意义提供了很好的细胞模型,也为进一步开展C3aR在其他细胞中的生理、病理意义创造了条件。

Objective Our previous study showed that the expression of C 3aR was increased in renal tubular epithelial cells （RTEC）.However, the role of C3aR in diabetic nephropathy remains unknown, and so does the exact physiological and pathological signifi-cance of C3aR in relevant renal tissues.In the present study, we investigated the physiological and pathological significance of C3aR in RTECs using a lentivirus expression vector and anRTEC strain overexpressing C3aR. Methods Based on the sequence of C3aR mRNA, the human C3aR gene was synthesized and cloned into the multi-clonal site of the lentivirus expression vector pLenti6.3-MCS-IRES2-EGFP to construct a C3aR expression vector pLenti6.3-C3aR-IRES2-EGFP.After identification by sequencing, the recombinant lentivirus expressing C3aR was packaged by cotransfecting293T cellswith the recombinant lentivirusexpression vector and packaged plasmid .Then,the recombinant lentivirus was used to infect the human RTECline HK 2.After screening in the medium with blasticidin, blasticidinr-esistant cell clones were obtained, followed by identification ofthe human RTECline stably overexpressing C 3aR by real-time PCR and immunochemical staining. Results TheC3aR expression vector pLenti6.3-C3aR-IRES2-EGFP was successfully constructed and the sequence was proved to be correct. C3aR expression recombinant lentivirus was successfully packaged with a titer of 5×108/mL.Blasticidin-resistant HK2 cell clones were ob-tained and the expression of HK2-C3aR mRNA was significantly higherin the HK2-C3aR cells than in the non-transfected HK2 cells （2.33± 0.45 sv 1.00±0.09, P〈0.05）. Conclusion We successfully constructed a C3aR expression lentivirus vector pLenti6.3-C3aR-IRES 2-EGFP and a C3aR overexpression renal tubular epithelial cell strain HK2-C3aR, which is very contributive to further studies of the roles of C3aR in renal tubular epithelial cells and other types of cells.