摘要
目的:探讨Ca~(2+)-活化T细胞核因子(nuclear factors of activated T cells,NFAT)信号通路在骨髓基质细胞介导的费城染色体阳性(Ph~+)急性淋巴细胞白血病(ALL)耐药中的作用。方法:聚合酶链式反应检测Sup-B15细胞及Ph~+ALL原代细胞NFAT mRNA的转录水平;流式细胞术检测Sup-B15细胞P-糖蛋白表达;Western blot检测Sup-B15细胞NFAT蛋白的变化;Annexin V/7-AAD标记细胞,流式细胞术检测细胞凋亡;Fluo 3-AM染料标记细胞,流式细胞术检测共培养后白血病细胞Ca~(2+)浓度变化。结果:Sup-B15细胞及Ph~+ALL原代细胞中均可检测到NFAT表达;流式细胞术未检测到Sup-B15细胞表达P-糖蛋白;临床应用的治疗浓度(2.5和5μmol/L)的环孢素(CAS)可明显抑制NFAT蛋白表达,其中5μmol/L CAS抑制作用更明显;临床治疗浓度CAS(2.5和5μmol/L)对Sup-B15细胞的凋亡无明显影响,而较高浓度CAS(10μmol/L)可诱导Sup-B15细胞的凋亡。骨髓基质细胞OP9可使Sup-B15细胞及Ph~+ALL原代细胞对伊马替尼的敏感性下降;与骨髓基质细胞OP9共培养后Sup-B15细胞Ca~(2+)浓度升高,总NFAT蛋白水平及核蛋白水平均增加;在共培养体系中加入环孢素抑制Ca~(2+)-NFAT信号通路,可降低OP9对Sup-B15细胞的保护作用。结论:Ca~(2+)-NFAT信号通路有助于Ph~+ALL细胞的存活,骨髓基质细胞_+可通过活化Ca~(2+)-NFAT信号通路介导Ph~+ALL细胞对IM的耐药。
Objective: To explore the role of Ca~(2+)-NFAT signaling pathway in Ph~+-ALL drug resistance mediated by bone marrow stromal cells. Methods: The transcription level of NFAT mRNA in Sup-B15 cells and Ph~+ ALL primary cells was detected by polymerase chain reaction. The expression of P-glycoprotein in Sup-B15 cells was detected by flow cytometry. The change of NFAT protein in Sup-B15 cells was detected by Western blot. AnnexinV/7-AAD was used to label cells. Flow cytometry was used to detect cell apoptosis; Fluo 3-AM dye was used to label cells, and flow cytometry used to detect changes of Ca~(2+) concentration in leukemia cells. Results: NFAT expression could be detected in both Sup-B15 and Ph~+ ALL primary cells; P-glycoprotein could not be detected by flow cytometry; CAS could significantly inhibit NFAT protein expression in clinically applied drug concentrations(2.5, 5 μmol/L); Clinically applied concentration of CAS(2.5, 5 μmol/L) has no significant effect on the apoptosis of Sup-B15 cells, while higher concentration of CAS(10 μmol/L) could induce apoptosis of Sup-B15 cells. Bone marrow stromal cells OP9 could,decrease the sensitivity of Sup-B15 cells and Ph~+ ALL primary cells to imatinib(IM); After co-culture with bone were marrow stromal cells, the Ca~(2+) concentration in Sup-B15 cells was enhanced, the levels of NFAT protein and nullear protein in sup-B15 cells also were enhanced. The addition of CAS in co-culture system could inlibit the Ca~(2+)-NFAT signaling pathway, reduce the protective effect of OP9 on Sup-B15 cells. Conclution: The Ca~(2+)-NFAT sigualing pathway, contributes to the survival of Ph~+ ALL cells. Bone marrow stromal cells can mediate the resistance of Ph~+ ALL cells to IM by activating Ca~(2+)-NFAT signaling pathway.
引文
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