Abstract
目的通过检测JAK2 V617F阳性HEL细胞及真性红细胞增多症(PV)患者造血细胞自噬水平,探索自噬调控对HEL细胞及PV患者造血细胞增殖的影响。方法应用流式细胞术、吖啶橙染色法、Western blot法检测JAK2 V617F阳性HEL细胞和12例PV患者造血细胞中LC3-Ⅱ蛋白的表达水平;通过雷帕霉素和3-甲基腺嘌呤(3-MA)分别诱导和抑制HEL细胞及3例PV患者骨髓细胞自噬水平,应用上述方法检测细胞中LC3-Ⅱ蛋白表达水平的改变,并采用CellTiter-Glo®发光法检测细胞增殖活力。结果HEL细胞内LC3-Ⅱ蛋白的平均荧光强度(159 389±29 001)及自噬体水平明显高于JAK2 V617F阴性K562细胞(96 047±24 134)(P=0.044),PV患者外周血中髓系细胞内LC3-Ⅱ蛋白平均荧光强度(92 842±4 250)明显高于健康志愿者(86 633±2 504)(P=0.001);自噬诱导剂雷帕霉素作用于HEL细胞和PV患者骨髓细胞12、24、48 h后,各时间点细胞增殖活力与常规培养组相比明显增强,48 h时HEL细胞和PV患者骨髓细胞增殖活力分别为101 413±3 720和18 744±1 015;自噬抑制剂3-MA作用于HEL细胞和PV患者骨髓细胞12、24、48 h后,各时间点细胞增殖活力与常规培养组相比明显减弱,48 h时HEL细胞和PV患者骨髓细胞增殖活力分别为5 732±166和5 371±56。结论JAK2 V617F阳性HEL细胞和PV患者造血细胞存在较高的基础自噬水平,上调自噬活性可促进其增殖;下调自噬活性对其增殖有明显抑制作用。
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