小鼠原代腹腔巨噬细胞外泌体的分离及鉴定

Isolation and identification of exosomes from mouse primary peritoneal macrophages

目的分离纯化小鼠原代腹腔巨噬细胞分泌的外泌体并进行鉴定。方法分别经5只雄性C57BL/6小鼠腹腔注射3%巯基乙酸盐肉汤,灌洗获得小鼠原代腹腔巨噬细胞后,用流式细胞术分析纯度。采用ExoQuick TC外泌体试剂盒提取小鼠原代腹腔巨噬细胞外泌体,BCA试剂盒测定外泌体蛋白含量,透射电镜观察外泌体形态,纳米颗粒跟踪分析仪检测外泌体粒径及分布,Western blot法检测外泌体标志物(CD9、CD63和TSG101)的表达。结果每只小鼠可获得约5×10^(6)个纯度为(99.17±0.65)%的腹腔巨噬细胞。5 mL小鼠原代腹腔巨噬细胞培养上清液中可提取869μg外泌体蛋白。小鼠原代腹腔巨噬细胞外泌体在电镜下呈折光性较强的典型茶托样囊泡,高表达外泌体特异性标志物TSG101、CD63和CD9,粒径分布集中在100~200 nm,平均粒径为175.2 nm。结论腹腔注射巯基乙酸盐肉汤可提高小鼠原代腹腔巨噬细胞得率,ExoQuick TC外泌体试剂盒能够提取足量且纯度较高的小鼠原代腹腔巨噬细胞外泌体。

Objective To isolate,purify and identify exosomes secreted by mouse primary peritoneal macrophages.Methods Five male C57BL/6 mice were intraperitoneally injected with 3%mercaptoacetate broth respectively,and the primary peritoneal macrophages were obtained by lavage,and then the purity was analyzed by flow cytometry.The exosomes of mouse primary peritoneal macrophages were extracted by ExoQuick TC exosome kit,which were measured for the protein content with BCA kit,observed for the morphology by transmission electron microscopy,detected for the particle size and distribution with nanoparticle tracking analyzer,and determined for the expression of exosome-specific markers(CD9,CD63 and TSG101)by Western blot.Results About 5×10^(6) peritoneal macrophages with the purity of(99.17±0.65)%were obtained from each mouse.Approximately 869μg of exosomal protein was extracted from 5 mL of mouse primary peritoneal macrophage culture supernatant.The exosomes of mouse primary peritoneal macrophages were typical tea saucerlike vesicles with strong refraction under electron microscopy,and highly expressed the exosome-specific markers TSG101,CD63 and CD9.The particle size distribution was concentrated between 100 and 200 nm,with an average particle size of175.2 nm.Conclusion Intraperitoneal injection of mercaptoacetate broth can improve the yield of mouse primary peritoneal macrophages.ExoQuick TC.exosome kit can extract sufficient amount of exosomes with high purity from mouse primary peritoneal macrophages.