ABSTRACT
@#目的：通过 CRISPR/Cas9 技术构建前列腺癌 PC3 细胞 TFDP3 基因敲除的稳转株，探讨抑制 TFDP3 表达对 PC3 细 胞周期、凋亡、迁移和侵袭能力的影响。方法：通过生物信息学筛选 sgRNA，通过 CRISPR/Cas9 技术、构建抑制 TFDP3 基因表达 的 sgRNA-Cas9 共转染慢病毒，感染 PC3 细胞后筛选获取稳转细胞株。通过流式细胞术对 TFDP3 基因敲除的实验组与空白对照 组进行细胞周期和凋亡检测，并进一步通过划痕实验和 Transwell 实验进行细胞迁移和侵袭能力检测。结果：通过生物信息学 筛选获得 3 条 sgRNA，其中 sgRNA2 有明显的抑制前列腺癌细胞基因表达的功能；通过 CRISPR/Cas9 技术成功构建了基于 CRISPR/Cas9 介导的 TFDP3 低表达的 PC3 细胞稳转株。抑制 TFDP3 基因表达后，相比于对照组，KO 组中 G0/G1 期细胞 百分比增加、G2/M 期细胞百分比下降（P<0.05 或 P<0.01），细胞凋亡率显著升高（P<0.05），细胞迁移率明显下降 [24 h 迁移率： (44.00±1.60)% vs (65.00±4.40)%，P<0.01]，穿过聚碳酸酯膜的侵袭细胞数明显下降 [（185.89±11.71）vs （248.33±11.95）个， P<0.01]。结论：通过 CRISPR/Cas9 技术抑制 TFDP3 基因表达后，PC3 细胞发生周期阻滞、凋亡率也有所增加、迁移和侵袭能力 显著减弱，提示 TFDP3 是一个前列腺癌促癌基因。
ABSTRACT
@# Objective: To investigate the effects of prostate cancer exosomes on the migration and invasion ability of stromal cells (WPMY-1), and to explore its mechanism. Methods: Exosomes in LNCaP-AI+F prostate cancer cell supernatant were isolated by ultracentrifugation and the typical structure of exosome was captured by electron microscope. The particle size distribution was analyzed by Zetaview, and Wb was used to identify the marker proteins and other proteins.After co-incubation of WPMY-1 cells and prostate cancer exosomes (40 µg/ml), laser confocal microscope was used to observe the uptake of PKH67-labeled exosomes by WPMY-1 cells; Transwell assay was used to detect the migration and invasion ability of WPMY-1 cells; qPCR was performed to detect the expression of three cancer-associated fibroblast (CAF)-related molecules (IL-8, PDGFB and MMP9) at mRNA level; and the phosphorylation of EGFR and ERK1/2 was analyzed by Wb. Results: Typical cup-shaped structure of exosomes was observed under electron microscope. The Zetaview results showed that the particle size distribution was concentrated at about 100 nm. The expression of exosome marker proteins CD63 andALIX further verified that the isolated particles were exosomes. Besides, EGFR, HER2 and SRC, which were related to the progression of prostate cancer, were also enriched in exosomes. After co-incubation, confocal microscope imaging showed a number of PKH67 labeled exosomes in recipient WPMY-1 cells. Transwell experiments showed that exosomes could significantly enhance the migration and invasion ability of WPMY-1 cells (all P<0.01). Compared with the control group, increased secretion of IL-8, PDGFB and MMP9 was observed after exosome treatment (40 µg/ml) (P<0.05 or P<0.01). Wb indicated that exosomes could promote the phosphorylation of EGFR and ERK1/2 of WPMY-1 cells (P<0.01). Conclusion: Prostate cancer cell exosomes could act on the stromal cell WPMY-1 to highly express multiple CAF-related molecules, promote the phosphorylation of EGFR and ERK1/2 and enhance the migration and invasion ability of WPMY-1 cells.