摘要
目的研究难治/复发再生障碍性贫血(AA)患者骨髓T淋巴细胞内雷帕霉素靶蛋白(mTOR)/核糖体蛋白S6途径活化情况,以及mTOR抑制剂雷帕霉素(RAPA)和CD28抗原阻断剂CTLA4免疫球蛋白(CTLA4Ig)对此途径的影响。方法 采集13例难治/复发AA、8例初治重型AA(SAA)以及10例缺铁性贫血(IDA)患者(对照组)的骨髓标本,加入RAPA和CTLA4Ig进行孵育,用流式细胞术检测加药前后每组患者CD3+T淋巴细胞胞质内磷酸化mTOR(p-roTOR)、磷酸化S6(P—S6)和干扰素γ(IFN-γ)的表达水平,并分析其与疾病的关系。结果①难治/复发AA组患者骨髓CD3+T细胞胞内p-mTOR、p-S6及IFN-γ的表达水平较对照组显著升高(P值均〈0.01)。②初治SAA患者p-mTOR和p-S6的表达水平低于难治/复发AA组(P值均〈0.01),而与对照组比较差异无统计学意义(P值均〉0.05);初治组IFN-γ的表达水平明显高于对照组(P值均〈0.01)。(3)RAPA和CTLA-4Ig作用后,难治/复发AA患者p-mTOR、p-S6及IFN-γ的表达水平较用药前明显下降(P值均〈0.01)。结论CD3+T淋巴细胞内mTOR/S6途径在难治/复发AA患者中活化。RAPA和CTLA-4Ig均可抑制难治/复发AA患者体内roTOR/S6途径,并下调IFN-γ。CD28/mTOR/S6和IFN-γ途径参与难治/复发AA的免疫发病机制,并且对RAPA和CTLA4Ig敏感,以CD28、mTOR为治疗靶点,临床应用RAPA和CTLA-4Ig治疗此类AA患者值得探索。
Objective To explore the activation status of signal pathway of mTOR/S6 in bone marrow(BM) T lymphoeytes of refractory/relapsed aplastic anemia patients (AA), and the effects of rapamycin (RAPA) and CTLA-4 immunoglobulin (CTLA-4Ig) on this pathway. Methods BM was collected from 13 refi'actory/relapsed AA patients, 8 newly diagnosed severe AA (SAA) patients and 10 iron deficiency anemia (IDA) (as controls) patients, and cocultured with RAPA and CTLA-4 Ig. The expression of p-roTOR, p-S6 and Interferon 7 (IFN-γ) in CD3 + T cells was measured by flow cytometry (FCM). Results (1) The expression of p-roTOR, p-S6 and IFN-γ in CD3 + T cells in refractory/relapsed AA group were significantly higher than those in controls (P 〈 0.01 ). (2)The expression of p-roTOR and p-S6 in T cells in newly diagnosed SAA group, was similar to those in controls ( P 〉 0.05 ) , but significantly lower than those in refractm2c/relapsed AA group (P 〈 0.01 ). The expression level of IFN-γ, in T cells were significantly higher than that in controls (P〈0.01). (3) On exposure to RAPA, the levels of p-roTOR, p-S6 and IFN-γ, in T cells in refractory/relapsed AA patients were significantly lower than those before the exposure ( all P 〈 0.05 ). And so were when exposed to CTLA-4 Ig ( all P 〈 0.01 ). Conclusion (1)The roTOR/S6 signal pathway is activated in refractory/relapsed AA. (2)The expression of p-roTOR, p-S6 and IFN-γ in refractory/relapsed AA can be suppressed by RAPA or CTLA-4Ig. (3) The signal pathway of CD28/mTOR/S6/IFN-γ might take part in immune pathogenesis of refractory/relapsed AA.
出处
《中华血液学杂志》
CAS
CSCD
北大核心
2009年第10期654-657,共4页
Chinese Journal of Hematology
基金
国家科技支撑计划(2008BA161802)
江苏省青年科技创新人才基金(BK2004424)