Objective To explore the effects of resveratrol-induced apoptosis and autophagy in T-cell acute lymphoblastic leukemia （T-ALL） cells and potential molecular mechanisms. Methods The anti-proliferation effect of resve...Objective To explore the effects of resveratrol-induced apoptosis and autophagy in T-cell acute lymphoblastic leukemia （T-ALL） cells and potential molecular mechanisms. Methods The anti-proliferation effect of resveratrol-induced, apoptosis and autophagy on T-ALL cells were detected by using MTI- test, immunofluorescence, electronic microscope, and flow cytometry, respectively. Western blotting was performed for detecting changes of apoptosis-associated proteins, cell cycle regulatory proteins and state of activation of Akt, mTOR, p70S6K, 4E-BP1, and p38-MAPK. Results Resveratrol inhibited the proliferation and dose and time-dependent manner. It also induced cyclin-dependent kinase （CDK） inhibitors p21 and induced apoptosis and autophagy in T-ALL cells in a cell cycle arrest at G0/G1 phase via up regulating p27 and down regulating cyclin A and cyclin D1. Western blotting revealed that resveratrol significantly decreased the expression of antiapoptotic proteins （Mcl-1 and Bcl-2） and increased the expression of proapoptotic proteins （Bax, Bim, and Bad）, and induced cleaved-caspase-3 in a time-dependent manner. Significant increase in ratio of LC3-11/LC3-1 and Beclin 1 was also detected. Furthermore, resveratrol induced significant dephosphorylation of Akt, mTOR, p70S6K, and 4E-BP1, but enhanced specific phosphorylation of p38-MAPK which could be blocked by SB203580. When autophagy was suppressed by 3-MA, apoptosis in T-ALL cells induced by resveratrol was enhanced. Conclusion Our findings have suggested that resveratrol induces cell cycle arrest, apoptosis, and autophagy in T-ALL cells through inhibiting Akt/mTOR/p7OS6K/4E-BP1 and activating p38-MAPK signaling pathways. Autophagy might play a role as a self-defense mechanism in T-ALL cells treated by resveratrol. Therefore, the reasonable inhibition of autophagy in T-ALL cells may serve as a promising strategy for resveratrol induced apoptosis and can be used as adjuvant chemotherapy for T-ALL.展开更多
背景:F-Box和WD40蛋白7(F-Box and WD40 domain protein 7,FBXW7)是E3泛素连接酶复合物的组份,控制NOTCH1,c-MYC和Cyclin E等多种蛋白的降解。目的:研究成人T细胞性急性淋巴细胞白血病(T-ALL)中FBXW7基因突变。方法:通过对54例成人T-AL...背景:F-Box和WD40蛋白7(F-Box and WD40 domain protein 7,FBXW7)是E3泛素连接酶复合物的组份,控制NOTCH1,c-MYC和Cyclin E等多种蛋白的降解。目的:研究成人T细胞性急性淋巴细胞白血病(T-ALL)中FBXW7基因突变。方法:通过对54例成人T-ALL患者FBXW7外显子5-12进行扩增、克隆和测序,分析FBXW7突变的发生率、突变位点和类型、与NOTCH1突变的相关性及其临床预后意义。结果:本组成人T-ALL中FBXW7突变率11.1%,共发现4种点突变(R465H,R465L,R479P和R505C)和1个插入/缺失突变,FBXW7突变全部位于WD40结构域。研究还发现,FBXW7突变患者中83.3%同时存在NOTCH1突变,与FBXW7突变并存的NOTCH1突变均发生于HD结构域,包括点突变(L1574P,L1596H和L1600P),和缺失/插入突变。此外,研究还显示,FBXW7单独突变组患者的总生存时间比无突变组延长(P=0.049)。结论:FBXW7突变可能在NOTCH1介导的TALL发病机制有重要作用。展开更多
Background: T-cell acute lymphoblastic leukemia (T-ALL) is an aggressive hematological malignancy with aberrant T-cell developmental arrest. Individuals with relapsed T-ALL have limited therapeutic alternatives and po...Background: T-cell acute lymphoblastic leukemia (T-ALL) is an aggressive hematological malignancy with aberrant T-cell developmental arrest. Individuals with relapsed T-ALL have limited therapeutic alternatives and poor prognosis. The mitochondrial function is critical for the T-cell viability. The voltage-dependent anion channel 2 (VDAC2) in the mitochondrial outer membrane, interacts with pro-apoptotic BCL-2 proteins and mediates the apoptosis of several cancer cell lines. Objective: The aim of the current study is to explore the role of VDAC2 in T-ALL cell survival and proliferation. Methods: Publicly available datasets of RNA-seq results were analyzed for expression of VDAC isoforms and T-ALL cell lines were treated with a VDAC2 small molecular inhibitor erastin. A VDAC2 RNA interference (siRNA) was delivered to T-ALL cell lines using a retroviral vector. Functional assays were performed to investigate the VDAC2 siRNA impacts on cell proliferation, apoptosis and survival of T-ALL cells. Results: Our analysis found a high expression of VDAC2 mRNA in various T-ALL cell lines. Public datasets of T-ALL RNA-seq also showed that VDAC2 is highly expressed in T-ALL (116.2 ± 36.7), compared to control groups. Only two T-ALL cell lines showed sensitivity to erastin (20 μM) after 48 hours of incubation, including Jurkat (IC<sub>50</sub> = 3.943 μM) and Molt4 (IC<sub>50</sub> = 3.286 μM), while another two T-ALL cells (CUTLL1 and RPMI 8402) had unstable IC<sub>50</sub>. However, five T-ALL cell lines (LOUCY, CCRF-CEM, P12-ICHI, HPB-ALL, and PEER cells) showed resistance to erastin. On the contrary, all T-ALL cell lines genetically inhibited with VDAC2 siRNA led to more than 80% decrease in VDAC2 mRNA levels, and a Conclusion: VDAC2 is highly expressed in T-ALL cells. The inhibition of VDAC2 significantly decreased cell viability, increased apoptosis, reduced cell proliferation and caused cell cycle sub-G1 arrest of T-ALL cells.展开更多
目的研究白血病相关基因对T细胞急性淋巴细胞白血病(T-ALL)耐药性的影响。方法对38例成人初治T细胞急性淋巴细胞白血病患者通过高通量测序技术检测54种白血病相关基因,将突变率最高基因与81种常用化疗药物在不同浓度下的敏感性相对比,...目的研究白血病相关基因对T细胞急性淋巴细胞白血病(T-ALL)耐药性的影响。方法对38例成人初治T细胞急性淋巴细胞白血病患者通过高通量测序技术检测54种白血病相关基因,将突变率最高基因与81种常用化疗药物在不同浓度下的敏感性相对比,探讨该基因与药物敏感性之间的相关性,同时与实际临床疗效相比较,并研究该基因的临床意义。结果在54种白血病相关性基因中,NOTCH1基因突变率最高,38例患者中18例发生NOTCH1突变,突变组对0.37、1.1、3.3 μmol/L地塞米松药物耐药性高于非突变组( P <0.05),突变组血小板水平低于非突变组( P <0.05),但NOTCH1突变与性别、年龄、白细胞计数、骨髓原始细胞数、血红蛋白水平、LDH水平无相关性( P >0.05)。结论 NOTCH1突变可引起地塞米松耐药,可能为预后不佳指标。展开更多
目的:探讨西达本胺对急性T淋巴细胞白血病CD8+T细胞的调控作用。方法:通过荧光定量PCR检测西达本胺处理的Jurkat细胞、淋巴细胞、与西达本胺处理的Jurkat细胞共培养的淋巴细胞的CXCL9、CXCL3 m RNA表达水平。通过流式细胞术检测西达本...目的:探讨西达本胺对急性T淋巴细胞白血病CD8+T细胞的调控作用。方法:通过荧光定量PCR检测西达本胺处理的Jurkat细胞、淋巴细胞、与西达本胺处理的Jurkat细胞共培养的淋巴细胞的CXCL9、CXCL3 m RNA表达水平。通过流式细胞术检测西达本胺处理的淋巴细胞、与西达本胺处理的Jurkat细胞共培养的淋巴细胞中CD8+T细胞的比例。结果:西达本胺上调Jurkat细胞系CXCL9的m RNA表达,上调水平呈剂量依赖(r=0.950),西达本胺5μmol/L组的CXCL9 m RNA表达是无处理组的164倍。西达本胺上调淋巴细胞CXCL9的m RNA表达,上调水平明显低于同浓度西达本胺处理的Jurkat细胞系。与西达本胺处理的Jurkat细胞共培养,可以上调淋巴细胞中CD8+T细胞的比例。结论:急性T淋巴细胞白血病中,西达本胺可能通过上调肿瘤细胞CXCL9的表达,增加肿瘤微环境中CXCL9的浓度,导致CD8+T细胞数量的增加。展开更多
基金supported by grants from the Department of Science and Technology of Sichuan Province,China (No.2008JY0029-1 and No.07FG002-024)research funds from the Program for Changjiang Scholars and Innovative-Research Team in University (No.IRT0935)
文摘Objective To explore the effects of resveratrol-induced apoptosis and autophagy in T-cell acute lymphoblastic leukemia （T-ALL） cells and potential molecular mechanisms. Methods The anti-proliferation effect of resveratrol-induced, apoptosis and autophagy on T-ALL cells were detected by using MTI- test, immunofluorescence, electronic microscope, and flow cytometry, respectively. Western blotting was performed for detecting changes of apoptosis-associated proteins, cell cycle regulatory proteins and state of activation of Akt, mTOR, p70S6K, 4E-BP1, and p38-MAPK. Results Resveratrol inhibited the proliferation and dose and time-dependent manner. It also induced cyclin-dependent kinase （CDK） inhibitors p21 and induced apoptosis and autophagy in T-ALL cells in a cell cycle arrest at G0/G1 phase via up regulating p27 and down regulating cyclin A and cyclin D1. Western blotting revealed that resveratrol significantly decreased the expression of antiapoptotic proteins （Mcl-1 and Bcl-2） and increased the expression of proapoptotic proteins （Bax, Bim, and Bad）, and induced cleaved-caspase-3 in a time-dependent manner. Significant increase in ratio of LC3-11/LC3-1 and Beclin 1 was also detected. Furthermore, resveratrol induced significant dephosphorylation of Akt, mTOR, p70S6K, and 4E-BP1, but enhanced specific phosphorylation of p38-MAPK which could be blocked by SB203580. When autophagy was suppressed by 3-MA, apoptosis in T-ALL cells induced by resveratrol was enhanced. Conclusion Our findings have suggested that resveratrol induces cell cycle arrest, apoptosis, and autophagy in T-ALL cells through inhibiting Akt/mTOR/p7OS6K/4E-BP1 and activating p38-MAPK signaling pathways. Autophagy might play a role as a self-defense mechanism in T-ALL cells treated by resveratrol. Therefore, the reasonable inhibition of autophagy in T-ALL cells may serve as a promising strategy for resveratrol induced apoptosis and can be used as adjuvant chemotherapy for T-ALL.
文摘背景:F-Box和WD40蛋白7(F-Box and WD40 domain protein 7,FBXW7)是E3泛素连接酶复合物的组份,控制NOTCH1,c-MYC和Cyclin E等多种蛋白的降解。目的:研究成人T细胞性急性淋巴细胞白血病(T-ALL)中FBXW7基因突变。方法:通过对54例成人T-ALL患者FBXW7外显子5-12进行扩增、克隆和测序,分析FBXW7突变的发生率、突变位点和类型、与NOTCH1突变的相关性及其临床预后意义。结果:本组成人T-ALL中FBXW7突变率11.1%,共发现4种点突变(R465H,R465L,R479P和R505C)和1个插入/缺失突变,FBXW7突变全部位于WD40结构域。研究还发现,FBXW7突变患者中83.3%同时存在NOTCH1突变,与FBXW7突变并存的NOTCH1突变均发生于HD结构域,包括点突变(L1574P,L1596H和L1600P),和缺失/插入突变。此外,研究还显示,FBXW7单独突变组患者的总生存时间比无突变组延长(P=0.049)。结论:FBXW7突变可能在NOTCH1介导的TALL发病机制有重要作用。
文摘Background: T-cell acute lymphoblastic leukemia (T-ALL) is an aggressive hematological malignancy with aberrant T-cell developmental arrest. Individuals with relapsed T-ALL have limited therapeutic alternatives and poor prognosis. The mitochondrial function is critical for the T-cell viability. The voltage-dependent anion channel 2 (VDAC2) in the mitochondrial outer membrane, interacts with pro-apoptotic BCL-2 proteins and mediates the apoptosis of several cancer cell lines. Objective: The aim of the current study is to explore the role of VDAC2 in T-ALL cell survival and proliferation. Methods: Publicly available datasets of RNA-seq results were analyzed for expression of VDAC isoforms and T-ALL cell lines were treated with a VDAC2 small molecular inhibitor erastin. A VDAC2 RNA interference (siRNA) was delivered to T-ALL cell lines using a retroviral vector. Functional assays were performed to investigate the VDAC2 siRNA impacts on cell proliferation, apoptosis and survival of T-ALL cells. Results: Our analysis found a high expression of VDAC2 mRNA in various T-ALL cell lines. Public datasets of T-ALL RNA-seq also showed that VDAC2 is highly expressed in T-ALL (116.2 ± 36.7), compared to control groups. Only two T-ALL cell lines showed sensitivity to erastin (20 μM) after 48 hours of incubation, including Jurkat (IC<sub>50</sub> = 3.943 μM) and Molt4 (IC<sub>50</sub> = 3.286 μM), while another two T-ALL cells (CUTLL1 and RPMI 8402) had unstable IC<sub>50</sub>. However, five T-ALL cell lines (LOUCY, CCRF-CEM, P12-ICHI, HPB-ALL, and PEER cells) showed resistance to erastin. On the contrary, all T-ALL cell lines genetically inhibited with VDAC2 siRNA led to more than 80% decrease in VDAC2 mRNA levels, and a Conclusion: VDAC2 is highly expressed in T-ALL cells. The inhibition of VDAC2 significantly decreased cell viability, increased apoptosis, reduced cell proliferation and caused cell cycle sub-G1 arrest of T-ALL cells.
文摘目的研究白血病相关基因对T细胞急性淋巴细胞白血病(T-ALL)耐药性的影响。方法对38例成人初治T细胞急性淋巴细胞白血病患者通过高通量测序技术检测54种白血病相关基因,将突变率最高基因与81种常用化疗药物在不同浓度下的敏感性相对比,探讨该基因与药物敏感性之间的相关性,同时与实际临床疗效相比较,并研究该基因的临床意义。结果在54种白血病相关性基因中,NOTCH1基因突变率最高,38例患者中18例发生NOTCH1突变,突变组对0.37、1.1、3.3 μmol/L地塞米松药物耐药性高于非突变组( P <0.05),突变组血小板水平低于非突变组( P <0.05),但NOTCH1突变与性别、年龄、白细胞计数、骨髓原始细胞数、血红蛋白水平、LDH水平无相关性( P >0.05)。结论 NOTCH1突变可引起地塞米松耐药,可能为预后不佳指标。
文摘目的:探讨西达本胺对急性T淋巴细胞白血病CD8+T细胞的调控作用。方法:通过荧光定量PCR检测西达本胺处理的Jurkat细胞、淋巴细胞、与西达本胺处理的Jurkat细胞共培养的淋巴细胞的CXCL9、CXCL3 m RNA表达水平。通过流式细胞术检测西达本胺处理的淋巴细胞、与西达本胺处理的Jurkat细胞共培养的淋巴细胞中CD8+T细胞的比例。结果:西达本胺上调Jurkat细胞系CXCL9的m RNA表达,上调水平呈剂量依赖(r=0.950),西达本胺5μmol/L组的CXCL9 m RNA表达是无处理组的164倍。西达本胺上调淋巴细胞CXCL9的m RNA表达,上调水平明显低于同浓度西达本胺处理的Jurkat细胞系。与西达本胺处理的Jurkat细胞共培养,可以上调淋巴细胞中CD8+T细胞的比例。结论:急性T淋巴细胞白血病中,西达本胺可能通过上调肿瘤细胞CXCL9的表达,增加肿瘤微环境中CXCL9的浓度,导致CD8+T细胞数量的增加。
