目的·研究TWEAK通过何种途径促使巨噬细胞源性外泌体分选miR-7至卵巢癌细胞。方法·收集TWEAK刺激前后的巨噬细胞，real-time PCR和Western blotting检测巨噬细胞中Dicer的表达。在巨噬细胞中沉默Dicer，real-time PCR检测巨噬细胞及其外泌体中miR-7的表达；过表达Dicer, real-time PCR检测巨噬细胞中miR-7的表达。继而用TWEAK刺激巨噬细胞，real-time PCR检测巨噬细胞源性外泌体中miR-7的表达，Western blotting检测TWEAK刺激前后的巨噬细胞中核因子κB（nuclear factor-κB，NF-κB）信号通路的表达；继而将NF-κB信号通路抑制，Western blotting检测TWEAK刺激前后巨噬细胞中Dicer的表达。结果· TWEAK刺激后，巨噬细胞中Dicer的表达下调。沉默巨噬细胞中Dicer的表达，巨噬细胞及其外泌体中miR-7的表达均上调；而将巨噬细胞中的Dicer过表达，再用TWEAK刺激巨噬细胞后，与对照组相比，Dicer过表达组巨噬细胞及其外泌体中的miR-7表达降低。TWEAK刺激巨噬细胞后，NF-κB信号通路蛋白的表达上调；而抑制NF-κB信号通路，再用TWEAK刺激巨噬细胞后，Dicer的表达无明显改变。结论· TWEAK通过活化NF-κB通路，抑制Dicer表达，从而促进巨噬细胞分选miR-7至其外泌体。

Objective · To investigate the mechanism of tumor necrosis factor like weak inducer of apoptosis (TWEAK) promoting macrophage-derived exosomal miR-7 to epithelial ovarian cancer (EOC). Methods · The of Dicer was detectedreal-time PCR and Western blotting in TWEAK-stimulated macrophages. The of miR-7 was detectedreal-time PCR in the macrophage and macrophage-derived exosome after silencing Dicer in macrophage. While in Dicer-overexpressing macrophage, real-time PCR was used to detect the of miR-7. Then TWEAK was used to stimulate the macrophage, and the of miR-7 in the macrophage and macrophage-derived exosome was detectedreal-time PCR. The of key proteins in the nuclear factor-κB (NF-κB) pathway was detectedWestern blotting in TWEAK-stimulated macrophage. After pretreatment of NF-κB inhibitor, Western blotting was used to detect the of Dicer and key proteins in the NF-κB pathway in TWEAK-stimulated macrophage. Results · The of Dicer in macrophage was down-regulated after TWEAK stimulating. The of miR-7 was up-regulated in Dicer-silencing macrophage and macrophage-derived exosome. While the of miR-7 was down-regulated in the macrophage and the macrophage-derived exosome in Dicer-overexpressing macrophage after TWEAK stimulating. The of key proteins in the NF-κB pathway in macrophage was also up-regulated after TWEAK stimulating. After inhibition of NF-κB signaling pathway, the of Dicer was not significantly changed in TWEAK-stimulated macrophage compared to the control group. Conclusion · TWEAK can active NF-κB pathway and inhibit the of Dicer to promote macrophage-derived exosomal miR-7 to EOC cells.