大鼠循环血中血小板和内皮细胞来源微囊泡的检测

Detection of Platelets and Endothelial Cell-Derived Microvesicles in Rat Peripheral Blood

目的建立流式细胞术对大鼠循环血中细胞微囊泡(MVs)的检测方法,并测定心肌缺血预适应(IPC)处理大鼠循环血中血小板来源的MVs(PMVs)及内皮细胞来源的MVs(EMVs)。方法大鼠经腹主动脉取血,枸橼酸钠抗凝,室温下经两步离心获得无血小板血浆(PFP)。PFP中分别加入FITC标记的血小板表面标志物CD61单抗或PE标记的内皮细胞表面标志物CD144单抗,采用1μm标准微球做粒径对照,2μm标准微球用于计数,流式细胞仪进行检测。结果 3.5%枸橼酸钠与血液按体积比1∶4混匀,离心后可得均匀、清亮的上清。PFP中1μm以下粒子信号占全部信号的99%以上。PMVs和EMVs分别为CD61阳性和CD144阳性的粒子,直径均小于1μm。IPC处理大鼠循环血中PMVs、EMVs水平分别为(4 053±1 987)个/μL、(4 870±825)个/μL。结论成功建立和优化了流式细胞术测定大鼠循环血中MVs的方法,并通过对IPC处理大鼠循环血中PMVs和EMVs的测定对MVs的检测方法进行了验证。

Objective To establish a flow-cytometric method to detect microvesicles （MVs） in rat peripheral blood, and to detect platelets-derived MVs （PMVs） and endothelial cell-derived MVs （EMVs） in blood from ischemic precondition-ing （IPC） treated rats. Methods Blood was withdrawn from rat abdominal aorta and anticoagulated with sodium citrate. Platelets-free plasma （PFP） was isolated through two centrifugations at room temperature. PFP was incubated with FITC-conjugated mouse anti-rat CD61 or PE-conjugated mouse anti-rat CD144. Standard beads in diameter of 1 and 2μm were used for calibration and absolute counting, respectively. Analysis was performed on flow cytometer. Results When 3.5%so-dium citrate was mixed with blood at volume ratio of 1∶4, clear supernatant was collected after centrifugation. Signals of parti-cles smaller than 1μm accounted for more than 99%of overall signals. PMVs and EMVs were CD61 positive and CD144 positive, respectively. Their diameters were both smaller than 1 μm. The concentration of PMVs and EMVs in peripheral blood from IPC treated rats was （4 053±1 987）/μL and （4 870±825）/μL, respectively. Conclusion The method for MVs de-tection by flow cytometry was successfully established and optimized, and verified through detecting PMVs and EMVs in pe-ripheral blood from IPC treated rats.