目的描绘弥漫型胃癌组织中组蛋白H3第27位赖氨酸的三甲基化(H3K27me3)修饰的全基因组分布图谱,通过鉴定H3K27me3所调控的关键靶基因,初步探究H3K27me3修饰重编程可能调控弥漫型胃癌细胞发生发展的作用机制。方法样本来源于2021-2023年...目的描绘弥漫型胃癌组织中组蛋白H3第27位赖氨酸的三甲基化(H3K27me3)修饰的全基因组分布图谱,通过鉴定H3K27me3所调控的关键靶基因,初步探究H3K27me3修饰重编程可能调控弥漫型胃癌细胞发生发展的作用机制。方法样本来源于2021-2023年在陆军特色医学中心消化内科内镜中心及手术室胃肠外科组接受检查或治疗的患者。共收集到正常组患者14例,其中男性6例,女性8例,平均年龄46岁;胃癌组患者14例,其中男性8例,女性6例,平均年龄63岁。采用染色质靶向剪切及转座酶技术(cleavage under target and tagmentation,CUT&Tag)捕获基因组H3K27me3修饰区域,分析H3K27me3修饰重编程特征。整合转录组(RNA‐Seq)测序数据、高通量染色体构象捕获技术(high‐throughput chromosome conformation capture,Hi‐C)及已发表的公共单细胞数据,分析H3K27me3修饰重编程在弥漫型胃癌细胞中所调控靶基因。结果CUT&Tag和RNA测序数据质量符合下游分析标准,正常胃黏膜组织和弥漫型胃癌组织的组蛋白H3K27me3修饰均主要分布于远端基因间区和内含子区。相较于正常组织,胃癌组织的H3K27me3修饰存在显著的重编程特征,表现为H3K27me3总体信号强度明显降低。其中缺失的2912个H3K27me3信号峰可能导致822个肿瘤相关基因的表达上调,这些基因中上调最显著(信号值强度的差异倍数≥2,P<0.05)的56个基因主要富集于哺乳动物雷帕霉素靶蛋白复合体1(mammalian target of rapamycin complex 1,mTORC1)信号通路,其中甲硫氨酸转运体SLC7A5和胱氨酸转运体SLC7A11在胃癌组织中的表达最高。单细胞数据提示,弥漫型胃癌组织中SLC7A11的异常高表达主要存在于肿瘤上皮细胞。利用公共数据和免疫组织化学实验进一步验证SLC7A11在弥漫型胃癌中高表达,且与胃癌患者的不良预后相关。结论组蛋白H3K27me3修饰重编程是弥漫型胃癌的重要表观遗传学特征;组蛋白H3K27me3修饰缺失可能上调肿瘤细胞SLC7A11表达,进而促进肿瘤进展。展开更多
目的探究肌球蛋白重链11(myosin heavy chain 11,MYH11)对喉鳞状细胞癌细胞恶性生物学行为的影响及机制。方法qRT-PCR检测MYH11 mRNA在喉鳞状细胞癌组织以及喉鳞状细胞癌细胞中的表达。喉鳞状细胞癌细胞TU686分为si-MYH11组和si-NC组。F...目的探究肌球蛋白重链11(myosin heavy chain 11,MYH11)对喉鳞状细胞癌细胞恶性生物学行为的影响及机制。方法qRT-PCR检测MYH11 mRNA在喉鳞状细胞癌组织以及喉鳞状细胞癌细胞中的表达。喉鳞状细胞癌细胞TU686分为si-MYH11组和si-NC组。FD-LSC-1细胞分为MYH11组和Vector组。CCK8、流式细胞术、细胞划痕、Transwell实验分别用于检测细胞增殖、凋亡、迁移以及侵袭能力,蛋白质印迹检测各组细胞ERK 1/2磷酸化水平及MAPK相对表达量。结果MYH11高表达于喉鳞状细胞癌组织及细胞。si-MYH11组TU686细胞增殖、迁移和侵袭能力显著低于si-NC组(P_(均)<0.05),细胞凋亡显著高于si-NC组(P<0.01),ERK1/2磷酸化水平及MAPK表达显著低于si-NC组(P<0.01)。MYH11组TU686细胞增殖、迁移和侵袭能力显著高于Vector组(P_(均)<0.05),细胞凋亡显著低于Vector组(P<0.01),ERK1/2磷酸化水平及MAPK表达显著高于Vector组(P<0.01)。结论MYH11激活ERK/MAPK信号通路而促进喉鳞状细胞癌细胞的增殖、迁移和侵袭能力。展开更多
Tumor suppressor p53-mediated cell cycle arrest and DNA damage repair may exert cytoprotective effects against cancer therapies,including WEE1 inhibition.Considering that p53 activation can also lead to multiple types...Tumor suppressor p53-mediated cell cycle arrest and DNA damage repair may exert cytoprotective effects against cancer therapies,including WEE1 inhibition.Considering that p53 activation can also lead to multiple types of cell death,the role of this tumor suppressor in WEE1 inhibitor-based therapies remains disputed.In this study,we reported that nucleolar stress-mediated p53 activation enhanced the WEE1 inhibitor AZD1775-induced ferroptosis to suppress lung cancer growth.Our findings showed that AZD1775 promoted ferroptosis by blocking cystine uptake,an action similar to that of Erastin.Meanwhile,inhibition of WEE1 by the WEE1 inhibitors or siRNAs induced compensatory upregulation of SLC7A11,which conferred resistance to ferroptosis.Mechanistically,AZD1775 prevented the enrichment of H3K9me3,a histone marker of transcriptional repression,on the SLC7A11 promoter by repressing the expression of the histone methyltransferase SETDB1,thereby enhancing NRF2-mediated SLC7A11 transcription.This finding was also validated using the H3K9me3 inhibitor BRD4770.Remarkably,we found that the nucleolar stress-inducing agent Actinomycin D(Act.D)inhibited SLC7A11 expression by activating p53,thus augmenting AZD1775-induced ferroptosis.Moreover,the combination of AZD1775 and Act.D synergistically suppressed wild-type p53-harboring lung cancer cell growth both in vitro and in vivo.Altogether,our study demonstrates that AZD1775 promotes ferroptosis by targeting cystine uptake but also mediates the adaptive activation of SLC7A11 through the WEE1-SETDB1 cascade and NRF2-induced transcription,and inhibition of SLC7A11 by Act.D boosts the anti-tumor efficacy of AZD1775 by enhancing ferroptosis in cancers with wild-type p53.展开更多
文摘目的描绘弥漫型胃癌组织中组蛋白H3第27位赖氨酸的三甲基化(H3K27me3)修饰的全基因组分布图谱,通过鉴定H3K27me3所调控的关键靶基因,初步探究H3K27me3修饰重编程可能调控弥漫型胃癌细胞发生发展的作用机制。方法样本来源于2021-2023年在陆军特色医学中心消化内科内镜中心及手术室胃肠外科组接受检查或治疗的患者。共收集到正常组患者14例,其中男性6例,女性8例,平均年龄46岁;胃癌组患者14例,其中男性8例,女性6例,平均年龄63岁。采用染色质靶向剪切及转座酶技术(cleavage under target and tagmentation,CUT&Tag)捕获基因组H3K27me3修饰区域,分析H3K27me3修饰重编程特征。整合转录组(RNA‐Seq)测序数据、高通量染色体构象捕获技术(high‐throughput chromosome conformation capture,Hi‐C)及已发表的公共单细胞数据,分析H3K27me3修饰重编程在弥漫型胃癌细胞中所调控靶基因。结果CUT&Tag和RNA测序数据质量符合下游分析标准,正常胃黏膜组织和弥漫型胃癌组织的组蛋白H3K27me3修饰均主要分布于远端基因间区和内含子区。相较于正常组织,胃癌组织的H3K27me3修饰存在显著的重编程特征,表现为H3K27me3总体信号强度明显降低。其中缺失的2912个H3K27me3信号峰可能导致822个肿瘤相关基因的表达上调,这些基因中上调最显著(信号值强度的差异倍数≥2,P<0.05)的56个基因主要富集于哺乳动物雷帕霉素靶蛋白复合体1(mammalian target of rapamycin complex 1,mTORC1)信号通路,其中甲硫氨酸转运体SLC7A5和胱氨酸转运体SLC7A11在胃癌组织中的表达最高。单细胞数据提示,弥漫型胃癌组织中SLC7A11的异常高表达主要存在于肿瘤上皮细胞。利用公共数据和免疫组织化学实验进一步验证SLC7A11在弥漫型胃癌中高表达,且与胃癌患者的不良预后相关。结论组蛋白H3K27me3修饰重编程是弥漫型胃癌的重要表观遗传学特征;组蛋白H3K27me3修饰缺失可能上调肿瘤细胞SLC7A11表达,进而促进肿瘤进展。
基金supported by the National Natural Science Foundation of China(82173022,82072879,82273098)the Innovative Research Team of High-level Local University in Shanghai.
文摘Tumor suppressor p53-mediated cell cycle arrest and DNA damage repair may exert cytoprotective effects against cancer therapies,including WEE1 inhibition.Considering that p53 activation can also lead to multiple types of cell death,the role of this tumor suppressor in WEE1 inhibitor-based therapies remains disputed.In this study,we reported that nucleolar stress-mediated p53 activation enhanced the WEE1 inhibitor AZD1775-induced ferroptosis to suppress lung cancer growth.Our findings showed that AZD1775 promoted ferroptosis by blocking cystine uptake,an action similar to that of Erastin.Meanwhile,inhibition of WEE1 by the WEE1 inhibitors or siRNAs induced compensatory upregulation of SLC7A11,which conferred resistance to ferroptosis.Mechanistically,AZD1775 prevented the enrichment of H3K9me3,a histone marker of transcriptional repression,on the SLC7A11 promoter by repressing the expression of the histone methyltransferase SETDB1,thereby enhancing NRF2-mediated SLC7A11 transcription.This finding was also validated using the H3K9me3 inhibitor BRD4770.Remarkably,we found that the nucleolar stress-inducing agent Actinomycin D(Act.D)inhibited SLC7A11 expression by activating p53,thus augmenting AZD1775-induced ferroptosis.Moreover,the combination of AZD1775 and Act.D synergistically suppressed wild-type p53-harboring lung cancer cell growth both in vitro and in vivo.Altogether,our study demonstrates that AZD1775 promotes ferroptosis by targeting cystine uptake but also mediates the adaptive activation of SLC7A11 through the WEE1-SETDB1 cascade and NRF2-induced transcription,and inhibition of SLC7A11 by Act.D boosts the anti-tumor efficacy of AZD1775 by enhancing ferroptosis in cancers with wild-type p53.
