Background:Regulatory proteins involved in human cellular division and proliferation,cyclin-dependent kinases 4 and 6(CDK4/6)are overexpressed in numerous cancers,including triple-negative breast cancer(TNBC).TNBC is ...Background:Regulatory proteins involved in human cellular division and proliferation,cyclin-dependent kinases 4 and 6(CDK4/6)are overexpressed in numerous cancers,including triple-negative breast cancer(TNBC).TNBC is a common pathological subtype of breast cancer that is prone to recurrence and metastasis,and has a single treatment method.As one of the CDK4/6 inhibitors,abemaciclib can effectively inhibit the growth of breast tumors.In this study,we synthesized LA-D-B1,a derivative of Abemaciclib,and investigated its anti-tumor effects in breast cancer.Methods:Cellular viability was assessed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)assay.Cell cloning and migration abilities were determined by colony formation assay and wound healing assay.Cell invasion abilities and adhesion were determined by cell invasion assay and cell adhesion assay.The impact of compound LA-D-B1 on cell proliferation and the cell cycle was analyzed through Western blotting,which quantified the levels of proteins associated with the cyclin-dependent kinase(CDK)4/6-cyclin D-Rb-E2F pathway.The in vivo anti-tumor activity of compound LA-D-B1 was investigated using a chick chorioallantoic membrane(CAM)model.Results:The study demonstrated that LA-D-B1 effectively suppressed breast cancer cell proliferation,induced apoptosis,and caused cell cycle arrest.Furthermore,LA-D-B1 reduced the expression of key proteins in the CDK4/6-cyclin D-Rb-E2F pathway,including CDK4,CDK6 and E2F1.The results also indicated significant antitumor activity of LA-D-B1 in a transplanted tumor model.Conclusion:In this study,LA-D-B1 demonstrated a potent anti-tumor effect by effectively suppressing cell proliferation and inhibiting cell cycle progression in breast cancer.These findings highlight the potential of LA-D-B1 as a valuable compound for enhancing therapeutic outcomes and controlling the progression of breast cancer.展开更多
Background:The primary cause of treatment failure in patients with refractory or relapsed B-cell non-Hodgkin lymphoma(r/r B-NHL)is resistance to current therapies,and therapy-induced senescence(TIS)stands out as a cru...Background:The primary cause of treatment failure in patients with refractory or relapsed B-cell non-Hodgkin lymphoma(r/r B-NHL)is resistance to current therapies,and therapy-induced senescence(TIS)stands out as a crucial mechanism contributing to tumor drug resistance.Here,we analyzed SENEX/Rho GTPase Activating Protein 18(ARHGAP18)expression and prognostic significance in doxorubicin-induced B-NHL-TIS model and r/r B-NHL patients,investigating its target in B-NHL cell senescence and the effect of combining specific inhibitors on apoptosis resistance in B-NHL-TIS cells.Methods:Raji cells were transfected with the human SENEX shRNA recombinant lentiviral vector(Sh-SENEX)and the empty vector negative(NC)to construct a stable transfection cell line with knockdown of SENEX.Effect of SENEX-silencing on B-NHL-TIS formation,cell function and cell cycle-related pathways was analyzed.Using doxorubicin(DOX)-inducible senescent B-NHL cells combined with the specific cyclin dependent kinase 4/6(CDK4/6)inhibitor Palbociclib to observe that blocking CDK4/6 effects on TIS formation.SENEX expression of 21 B-NHL patients and 8 healthy controls were analyzed by qRT-PCR,and the correlation between its expression and clinical indicators were evaluated.Results:The downregulation of SENEX expression promotes G1-S phase transition and apoptosis while inhibiting cell proliferation,collectively suppressing the formation of TIS in B-NHL.Blockade of CDK4/6 promotes the DOX-induced G1 phase arrest to enhance TIS formation in B-NHL cells which can reverse the regulatory effect of silencing SENEX on B-NHL cell cycle regulation and senescence.The expression levels of SENEX were notably elevated in B-NHL patients compared to healthy controls,and Elevated expression levels of SENEX were associated with poor prognosis of B-NHL patients.Conclusions:SENEX enhances apoptosis resistance in B-NHL by inhibiting CDK4/6,thereby preventing G1-S phase transition and promoting TIS formation.展开更多
2024年5月举行的欧洲肿瘤内科学会乳腺癌年会(European Society for Medical Oncology Breast Cance,ESMO BC)在德国柏林召开。本次年会展示了一系列针对乳腺癌治疗的最新进展,包括创新疗法和诊治策略。特别值得关注的是,细胞周期蛋白...2024年5月举行的欧洲肿瘤内科学会乳腺癌年会(European Society for Medical Oncology Breast Cance,ESMO BC)在德国柏林召开。本次年会展示了一系列针对乳腺癌治疗的最新进展,包括创新疗法和诊治策略。特别值得关注的是,细胞周期蛋白依赖性激酶4和6(cyclin-dependent kinases 4 and 6,CDK4/6)抑制剂联合内分泌治疗(endocrine therapy,ET)在早期乳腺癌新辅助治疗中的研究尚未达到主要终点,而探索性分析结果表明,该领域仍有待进一步研究。CDK4/6抑制剂联合ET继续作为高危患者辅助治疗的标准。同时,阿贝西利在携带BRCA1/2突变的患者亚组中显示出初步的一致性获益。瑞波西利虽然不良反应可控,但仍需进行密切监测。新型CDK4选择性抑制剂、AKT抑制剂、抗体药物偶联物(antibody-drug conjugates,ADC)以及免疫治疗为晚期乳腺癌患者提供了新的治疗选项。本次年会所展现的研究成果,不仅代表了乳腺癌治疗领域的进步,也为未来的研究方向和患者治疗策略提供了新的视野。本文就此次年会上重点的研究进展进行综述。展开更多
目的分析CDK4/6抑制剂在临床应用中所致不良反应(ADR)的特点,为临床安全用药提供参考。方法检索维普、中国知网、万方、Web of Science、PubMed等数据库中关于CDK4/6抑制剂致ADRs的文献并进行分析。结果CDK4/6抑制剂致ADRs的个案报道共3...目的分析CDK4/6抑制剂在临床应用中所致不良反应(ADR)的特点,为临床安全用药提供参考。方法检索维普、中国知网、万方、Web of Science、PubMed等数据库中关于CDK4/6抑制剂致ADRs的文献并进行分析。结果CDK4/6抑制剂致ADRs的个案报道共34例;患者平均年龄约63.5岁,ADRs多发生在用药4个月内(29例,85.29%);CDK4/6抑制剂致ADRs主要以皮肤及其附件损害(14例,41.18%)、呼吸系统损害(6例,17.65%)、肝胆系统损害(4例,11.76%)为主;经停药和/或对症治疗后达到症状好转或治愈的有31例;3例最终死亡。结论临床使用CDK4/6抑制剂时应加强用药监测,开展多学科患者管理,而CDK4/6抑制剂的ADR发生机制尚需进一步研究。展开更多
目的探究赖氨酸特异性甲基转移酶2C(lysine specific methyltransferase 2C,KMT2C)在胃癌发生发展中的作用及机制。方法通过TCGA数据库分析KMT2C在胃癌与癌旁的表达差异。采用Western blot检测KMT2C在胃癌与癌旁临床样本中的表达差异。...目的探究赖氨酸特异性甲基转移酶2C(lysine specific methyltransferase 2C,KMT2C)在胃癌发生发展中的作用及机制。方法通过TCGA数据库分析KMT2C在胃癌与癌旁的表达差异。采用Western blot检测KMT2C在胃癌与癌旁临床样本中的表达差异。通过Kaplan-Meier Plotter数据库分析KMT2C对胃癌患者预后的影响。采用细胞实验(克隆形成、EdU及CCK-8检测)及皮下瘤负荷模型检测KMT2C在体内外对胃癌细胞增殖能力的影响。结果KMT2C在胃癌中高表达。胃癌患者中KMT2C高表达组相对于KMT2C低表达组预后较差。敲减KMT2C在体内外均有抑制胃癌细胞增殖的作用。基因集富集分析(GSEA)发现KMT2C影响c-Myc信号通路。敲减KMT2C后,H3K4me1蛋白表达水平降低,同时,CDK4的mRNA与蛋白表达水平降低。KMT2C与c-Myc核内结合促进了c-Myc与CDK4的启动子区域的结合。结论KMT2C通过影响c-Myc/CDK4信号通路促进胃癌细胞增殖。展开更多
基金supported by the National Natural Science Foundation of China(82273167,82104174,81602626,12271068,82172558 and 82373112)Jiangsu Province Basic Research Program Natural Science Foundation(Outstanding Youth Fund Project,BK20220063)+7 种基金the Key Program of Basic Science(Natural Science)of Jiangsu Province(22KJA350001)“Huaguo Mountain Talent Plan”of Lianyungang City(Innovative Talents Liu Bin)Qing Lan Project of Jiangsu Universities(Outstanding Young Backbone Teachers,Ji Jing)the Natural Science Foundation of Jiangsu Higher Education Institutions of China(No.20KJB350008)Priority Academic Program Development of Jiangsu Higher Education Institutions,College Students’Innovative Entrepreneurial Training Plan Program(Project Nos.SY202211641640011,SY202311641640002 and SZ202311641640002)Chen Xiao-Ping Foundation for the Development of Science and Technology of Hubei Province(Project No.CXPJJH123003-027)the Distinguished Young Scholars of Nanjing(JQX20008)Scientific Research Foundation for Returned Scholars of Tongji Hospital(Project 2022hgry021).
文摘Background:Regulatory proteins involved in human cellular division and proliferation,cyclin-dependent kinases 4 and 6(CDK4/6)are overexpressed in numerous cancers,including triple-negative breast cancer(TNBC).TNBC is a common pathological subtype of breast cancer that is prone to recurrence and metastasis,and has a single treatment method.As one of the CDK4/6 inhibitors,abemaciclib can effectively inhibit the growth of breast tumors.In this study,we synthesized LA-D-B1,a derivative of Abemaciclib,and investigated its anti-tumor effects in breast cancer.Methods:Cellular viability was assessed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)assay.Cell cloning and migration abilities were determined by colony formation assay and wound healing assay.Cell invasion abilities and adhesion were determined by cell invasion assay and cell adhesion assay.The impact of compound LA-D-B1 on cell proliferation and the cell cycle was analyzed through Western blotting,which quantified the levels of proteins associated with the cyclin-dependent kinase(CDK)4/6-cyclin D-Rb-E2F pathway.The in vivo anti-tumor activity of compound LA-D-B1 was investigated using a chick chorioallantoic membrane(CAM)model.Results:The study demonstrated that LA-D-B1 effectively suppressed breast cancer cell proliferation,induced apoptosis,and caused cell cycle arrest.Furthermore,LA-D-B1 reduced the expression of key proteins in the CDK4/6-cyclin D-Rb-E2F pathway,including CDK4,CDK6 and E2F1.The results also indicated significant antitumor activity of LA-D-B1 in a transplanted tumor model.Conclusion:In this study,LA-D-B1 demonstrated a potent anti-tumor effect by effectively suppressing cell proliferation and inhibiting cell cycle progression in breast cancer.These findings highlight the potential of LA-D-B1 as a valuable compound for enhancing therapeutic outcomes and controlling the progression of breast cancer.
基金This work was supported by the Major Subject of Science and Technology of Anhui Province(Grant Number:201903a07020030).
文摘Background:The primary cause of treatment failure in patients with refractory or relapsed B-cell non-Hodgkin lymphoma(r/r B-NHL)is resistance to current therapies,and therapy-induced senescence(TIS)stands out as a crucial mechanism contributing to tumor drug resistance.Here,we analyzed SENEX/Rho GTPase Activating Protein 18(ARHGAP18)expression and prognostic significance in doxorubicin-induced B-NHL-TIS model and r/r B-NHL patients,investigating its target in B-NHL cell senescence and the effect of combining specific inhibitors on apoptosis resistance in B-NHL-TIS cells.Methods:Raji cells were transfected with the human SENEX shRNA recombinant lentiviral vector(Sh-SENEX)and the empty vector negative(NC)to construct a stable transfection cell line with knockdown of SENEX.Effect of SENEX-silencing on B-NHL-TIS formation,cell function and cell cycle-related pathways was analyzed.Using doxorubicin(DOX)-inducible senescent B-NHL cells combined with the specific cyclin dependent kinase 4/6(CDK4/6)inhibitor Palbociclib to observe that blocking CDK4/6 effects on TIS formation.SENEX expression of 21 B-NHL patients and 8 healthy controls were analyzed by qRT-PCR,and the correlation between its expression and clinical indicators were evaluated.Results:The downregulation of SENEX expression promotes G1-S phase transition and apoptosis while inhibiting cell proliferation,collectively suppressing the formation of TIS in B-NHL.Blockade of CDK4/6 promotes the DOX-induced G1 phase arrest to enhance TIS formation in B-NHL cells which can reverse the regulatory effect of silencing SENEX on B-NHL cell cycle regulation and senescence.The expression levels of SENEX were notably elevated in B-NHL patients compared to healthy controls,and Elevated expression levels of SENEX were associated with poor prognosis of B-NHL patients.Conclusions:SENEX enhances apoptosis resistance in B-NHL by inhibiting CDK4/6,thereby preventing G1-S phase transition and promoting TIS formation.
文摘2024年5月举行的欧洲肿瘤内科学会乳腺癌年会(European Society for Medical Oncology Breast Cance,ESMO BC)在德国柏林召开。本次年会展示了一系列针对乳腺癌治疗的最新进展,包括创新疗法和诊治策略。特别值得关注的是,细胞周期蛋白依赖性激酶4和6(cyclin-dependent kinases 4 and 6,CDK4/6)抑制剂联合内分泌治疗(endocrine therapy,ET)在早期乳腺癌新辅助治疗中的研究尚未达到主要终点,而探索性分析结果表明,该领域仍有待进一步研究。CDK4/6抑制剂联合ET继续作为高危患者辅助治疗的标准。同时,阿贝西利在携带BRCA1/2突变的患者亚组中显示出初步的一致性获益。瑞波西利虽然不良反应可控,但仍需进行密切监测。新型CDK4选择性抑制剂、AKT抑制剂、抗体药物偶联物(antibody-drug conjugates,ADC)以及免疫治疗为晚期乳腺癌患者提供了新的治疗选项。本次年会所展现的研究成果,不仅代表了乳腺癌治疗领域的进步,也为未来的研究方向和患者治疗策略提供了新的视野。本文就此次年会上重点的研究进展进行综述。
文摘目的分析CDK4/6抑制剂在临床应用中所致不良反应(ADR)的特点,为临床安全用药提供参考。方法检索维普、中国知网、万方、Web of Science、PubMed等数据库中关于CDK4/6抑制剂致ADRs的文献并进行分析。结果CDK4/6抑制剂致ADRs的个案报道共34例;患者平均年龄约63.5岁,ADRs多发生在用药4个月内(29例,85.29%);CDK4/6抑制剂致ADRs主要以皮肤及其附件损害(14例,41.18%)、呼吸系统损害(6例,17.65%)、肝胆系统损害(4例,11.76%)为主;经停药和/或对症治疗后达到症状好转或治愈的有31例;3例最终死亡。结论临床使用CDK4/6抑制剂时应加强用药监测,开展多学科患者管理,而CDK4/6抑制剂的ADR发生机制尚需进一步研究。
