Journal of Molecular Cell Biology最新文献

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Mitochondrial transport of catalytic RNAs and targeting of the organellar transcriptome in human cells. 线粒体运输催化 RNA 和人体细胞内细胞器转录组的靶向。
IF 5.3 2区 生物学
Journal of Molecular Cell Biology Pub Date : 2024-01-17 DOI: 10.1093/jmcb/mjad051
Paweł Głodowicz, Konrad Kuczyński, Romain Val, André Dietrich, Katarzyna Rolle
{"title":"Mitochondrial transport of catalytic RNAs and targeting of the organellar transcriptome in human cells.","authors":"Paweł Głodowicz, Konrad Kuczyński, Romain Val, André Dietrich, Katarzyna Rolle","doi":"10.1093/jmcb/mjad051","DOIUrl":"10.1093/jmcb/mjad051","url":null,"abstract":"<p><p>Mutations in the small genome present in mitochondria often result in severe pathologies. Different genetic strategies have been explored, aiming to rescue such mutations. A number of these strategies were based on the capacity of human mitochondria to import RNAs from the cytosol and designed to repress the replication of the mutated genomes or to provide the organelles with wild-type versions of mutant transcripts. However, the mutant RNAs present in mitochondria turned out to be an obstacle to therapy and little attention has been devoted so far to their elimination. Here, we present the development of a strategy to knockdown mitochondrial RNAs in human cells using the transfer RNA-like structure of Brome mosaic virus or Tobacco mosaic virus as a shuttle to drive trans-cleaving ribozymes into the organelles in human cell lines. We obtained a specific knockdown of the targeted mitochondrial ATP6 mRNA, followed by a deep drop in ATP6 protein and a functional impairment of the oxidative phosphorylation chain. Our strategy provides a powerful approach to eliminate mutant organellar transcripts and to analyse the control and communication of the human organellar genetic system.</p>","PeriodicalId":16433,"journal":{"name":"Journal of Molecular Cell Biology","volume":" ","pages":""},"PeriodicalIF":5.3,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11148835/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10018208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
ANGPTL3 negatively regulates IL-1β-induced NF-κB activation by inhibiting the IL1R1-associated signaling complex assembly. ANGPTL3 通过抑制 IL1R1 相关信号复合体的组装,对 IL-1β 诱导的 NF-κB 激活进行负向调节。
IF 5.3 2区 生物学
Journal of Molecular Cell Biology Pub Date : 2024-01-17 DOI: 10.1093/jmcb/mjad053
Yu Zhang, Zi-Tong Zhang, Shi-Yuan Wan, Jing Yang, Yu-Juan Wei, Hui-Jing Chen, Wan-Zhu Zhou, Qiu-Yi Song, Shu-Xuan Niu, Ling Zheng, Kun Huang
{"title":"ANGPTL3 negatively regulates IL-1β-induced NF-κB activation by inhibiting the IL1R1-associated signaling complex assembly.","authors":"Yu Zhang, Zi-Tong Zhang, Shi-Yuan Wan, Jing Yang, Yu-Juan Wei, Hui-Jing Chen, Wan-Zhu Zhou, Qiu-Yi Song, Shu-Xuan Niu, Ling Zheng, Kun Huang","doi":"10.1093/jmcb/mjad053","DOIUrl":"10.1093/jmcb/mjad053","url":null,"abstract":"<p><p>Interleukin-1β (IL-1β)-induced signaling is one of the most important pathways in regulating inflammation and immunity. The assembly of the receptor complex, consisting of the ligand IL-1β, the IL-1 receptor (IL-1R) type 1 (IL1R1), and the IL-1R accessory protein (IL1RAP), initiates this signaling. However, how the IL1R1-associated complex is regulated remains elusive. Angiopoietin like 3 (ANGPTL3), a key inhibitor of plasma triglyceride clearance, is mainly expressed in the liver and exists in both intracellular and extracellular secreted forms. Currently, ANGPTL3 has emerged as a highly promising drug target for hypertriglyceridemia and associated cardiovascular diseases. However, most studies have focused on the secreted form of ANGPTL3, while its intracellular role is still largely unknown. Here, we report that intracellular ANGPTL3 acts as a negative regulator of IL-1β-triggered signaling. Overexpression of ANGPTL3 inhibited IL-1β-induced NF-κB activation and the transcription of inflammatory genes in HepG2, THP1, and HEK293T cells, while knockdown or knockout of ANGPTL3 resulted in opposite effects. Mechanistically, ANGPTL3 interacted with IL1R1 and IL1RAP through its intracellular C-terminal fibrinogen-like domain and disrupted the assembly of the IL1R1-associated complex. Taken together, our study reveals a novel role for ANGPTL3 in inflammation, whereby it inhibits the physiological interaction between IL1R1 and IL1RAP to maintain immune tolerance and homeostasis in the liver.</p>","PeriodicalId":16433,"journal":{"name":"Journal of Molecular Cell Biology","volume":" ","pages":""},"PeriodicalIF":5.3,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11149415/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10076021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Distinct roles of two SEC scaffold proteins, AFF1 and AFF4, in regulating RNA polymerase II transcription elongation. 两种 SEC 支架蛋白 AFF1 和 AFF4 在调节 RNA 聚合酶 II 转录伸长过程中的不同作用。
IF 5.3 2区 生物学
Journal of Molecular Cell Biology Pub Date : 2024-01-17 DOI: 10.1093/jmcb/mjad049
Zhuanzhuan Che, Xiaoxu Liu, Qian Dai, Ke Fang, Chenghao Guo, Junjie Yue, Haitong Fang, Peng Xie, Zhuojuan Luo, Chengqi Lin
{"title":"Distinct roles of two SEC scaffold proteins, AFF1 and AFF4, in regulating RNA polymerase II transcription elongation.","authors":"Zhuanzhuan Che, Xiaoxu Liu, Qian Dai, Ke Fang, Chenghao Guo, Junjie Yue, Haitong Fang, Peng Xie, Zhuojuan Luo, Chengqi Lin","doi":"10.1093/jmcb/mjad049","DOIUrl":"10.1093/jmcb/mjad049","url":null,"abstract":"<p><p>The super elongation complex (SEC) containing positive transcription elongation factor b plays a critical role in regulating transcription elongation. AFF1 and AFF4, two members of the AF4/FMR2 family, act as central scaffold proteins of SEC and are associated with various human diseases. However, their precise roles in transcriptional control remain unclear. Here, we investigate differences in the genomic distribution patterns of AFF1 and AFF4 around transcription start sites (TSSs). AFF1 mainly binds upstream of the TSS, while AFF4 is enriched downstream of the TSS. Notably, disruption of AFF4 results in slow elongation and early termination in a subset of AFF4-bound active genes, whereas AFF1 deletion leads to fast elongation and transcriptional readthrough in the same subset of genes. Additionally, AFF1 knockdown increases AFF4 levels at chromatin, and vice versa. In summary, these findings demonstrate that AFF1 and AFF4 function antagonistically to regulate RNA polymerase II transcription.</p>","PeriodicalId":16433,"journal":{"name":"Journal of Molecular Cell Biology","volume":" ","pages":""},"PeriodicalIF":5.3,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11113081/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9922959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
CAMSAP2 and CAMSAP3 localize at microtubule intersections to regulate the spatial distribution of microtubules. CAMSAP2 和 CAMSAP3 定位于微管交汇处,调节微管的空间分布。
IF 5.3 2区 生物学
Journal of Molecular Cell Biology Pub Date : 2024-01-17 DOI: 10.1093/jmcb/mjad050
Rui Zhang, Lusheng Gu, Wei Chen, Nobutoshi Tanaka, Zhengrong Zhou, Honglin Xu, Tao Xu, Wei Ji, Xin Liang, Wenxiang Meng
{"title":"CAMSAP2 and CAMSAP3 localize at microtubule intersections to regulate the spatial distribution of microtubules.","authors":"Rui Zhang, Lusheng Gu, Wei Chen, Nobutoshi Tanaka, Zhengrong Zhou, Honglin Xu, Tao Xu, Wei Ji, Xin Liang, Wenxiang Meng","doi":"10.1093/jmcb/mjad050","DOIUrl":"10.1093/jmcb/mjad050","url":null,"abstract":"<p><p>Microtubule networks support many cellular processes and exhibit a highly ordered architecture. However, due to the limited axial resolution of conventional light microscopy, the structural features of these networks cannot be resolved in three-dimensional (3D) space. Here, we used customized ultra-high-resolution interferometric single-molecule localization microscopy to characterize the microtubule networks in Caco2 cells. We found that the calmodulin-regulated spectrin-associated proteins (CAMSAPs) localize at a portion of microtubule intersections. Further investigation showed that depletion of CAMSAP2 and CAMSAP3 leads to the narrowing of the inter-microtubule distance. Mechanistically, CAMSAPs recognize microtubule defects, which often occur near microtubule intersections, and then recruit katanin to remove the damaged microtubules. Therefore, the CAMSAP-katanin complex is a regulatory module for the distance between microtubules. Taken together, our results characterize the architecture of cellular microtubule networks in high resolution and provide molecular insights into how the 3D structure of microtubule networks is controlled.</p>","PeriodicalId":16433,"journal":{"name":"Journal of Molecular Cell Biology","volume":" ","pages":""},"PeriodicalIF":5.3,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11156519/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10332748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Regulation of endogenous retroviruses in murine embryonic stem cells and early embryos. 小鼠胚胎干细胞和早期胚胎中内源性逆转录病毒的调控。
IF 5.3 2区 生物学
Journal of Molecular Cell Biology Pub Date : 2024-01-17 DOI: 10.1093/jmcb/mjad052
Xinyi Lu
{"title":"Regulation of endogenous retroviruses in murine embryonic stem cells and early embryos.","authors":"Xinyi Lu","doi":"10.1093/jmcb/mjad052","DOIUrl":"10.1093/jmcb/mjad052","url":null,"abstract":"<p><p>Endogenous retroviruses (ERVs) are important components of transposable elements that constitute ∼40% of the mouse genome. ERVs exhibit dynamic expression patterns during early embryonic development and are engaged in numerous biological processes. Therefore, ERV expression must be closely monitored in cells. Most studies have focused on the regulation of ERV expression in mouse embryonic stem cells (ESCs) and during early embryonic development. This review touches on the classification, expression, and functions of ERVs in mouse ESCs and early embryos and mainly discusses ERV modulation strategies from the perspectives of transcription, epigenetic modification, nucleosome/chromatin assembly, and post-transcriptional control.</p>","PeriodicalId":16433,"journal":{"name":"Journal of Molecular Cell Biology","volume":" ","pages":""},"PeriodicalIF":5.3,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10794949/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10039234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stability and function of RCL1 are dependent on the interaction with BMS1. RCL1 的稳定性和功能取决于与 BMS1 的相互作用。
IF 5.5 2区 生物学
Journal of Molecular Cell Biology Pub Date : 2024-01-05 DOI: 10.1093/jmcb/mjad046
Yong Wang, Zhenyu Zhao, Hongyan Yu, Hui Shi, Boxiang Tao, Yinan He, Jun Chen, Jinrong Peng, Meifu Gan, Li Jan Lo
{"title":"Stability and function of RCL1 are dependent on the interaction with BMS1.","authors":"Yong Wang, Zhenyu Zhao, Hongyan Yu, Hui Shi, Boxiang Tao, Yinan He, Jun Chen, Jinrong Peng, Meifu Gan, Li Jan Lo","doi":"10.1093/jmcb/mjad046","DOIUrl":"10.1093/jmcb/mjad046","url":null,"abstract":"<p><p>During ribosome biogenesis, the small subunit (SSU) processome is responsible for 40S assembly. The BMS1/RCL1 complex is a core component of the SSU processome that plays an important role in 18S rRNA processing and maturation. Genetic studies using zebrafish mutants indicate that both Bms1-like (Bms1l) and Rcl1 are essential for digestive organ development. In spite of vital functions of this complex, the mutual dependence of these two nucleolar proteins for the stability and function remains elusive. In this study, we identified an RCL1-interacting domain in BMS1, which is conserved in zebrafish and humans. Moreover, both the protein stability and nucleolar entry of RCL1 depend on its interaction with BMS1, otherwise RCL1 degraded through the ubiquitination-proteasome pathway. Functional studies revealed that overexpression of RCL1 in BMS1-knockdown cells can partially rescue the defects in 18S rRNA processing and cell proliferation, and hepatocyte-specific overexpression of Rcl1 can resume zebrafish liver development in the bms1l substitution mutant bms1lsq163/sq163but not in the knockout mutant bms1lzju1/zju1, which is attributed to the nucleolar entry of Rcl1 in the former mutant. Our data demonstrate that BMS1 and RCL1 interaction is essential for not only pre-rRNA processing but also the communication between ribosome biogenesis and cell cycle regulation.</p>","PeriodicalId":16433,"journal":{"name":"Journal of Molecular Cell Biology","volume":" ","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11023236/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9834332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cholinergic α7 nAChR signaling suppresses SARS-CoV-2 infection and inflammation in lung epithelial cells. 胆碱能α7 nAChR信号抑制SARS-CoV-2感染和肺上皮细胞炎症。
IF 5.5 2区 生物学
Journal of Molecular Cell Biology Pub Date : 2024-01-05 DOI: 10.1093/jmcb/mjad048
Jing Wen, Jing Sun, Yanhong Tang, Jincun Zhao, Xiao Su
{"title":"Cholinergic α7 nAChR signaling suppresses SARS-CoV-2 infection and inflammation in lung epithelial cells.","authors":"Jing Wen, Jing Sun, Yanhong Tang, Jincun Zhao, Xiao Su","doi":"10.1093/jmcb/mjad048","DOIUrl":"10.1093/jmcb/mjad048","url":null,"abstract":"","PeriodicalId":16433,"journal":{"name":"Journal of Molecular Cell Biology","volume":" ","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10901198/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9871332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Estrogen receptor α-mediated signaling inhibits type I interferon response to promote breast carcinogenesis. 雌激素受体α介导的信号传导抑制 I 型干扰素反应,从而促进乳腺癌的发生。
IF 5.5 2区 生物学
Journal of Molecular Cell Biology Pub Date : 2024-01-05 DOI: 10.1093/jmcb/mjad047
Li-Bo Cao, Zi-Lun Ruan, Yu-Lin Yang, Nian-Chao Zhang, Chuan Gao, Cheguo Cai, Jing Zhang, Ming-Ming Hu, Hong-Bing Shu
{"title":"Estrogen receptor α-mediated signaling inhibits type I interferon response to promote breast carcinogenesis.","authors":"Li-Bo Cao, Zi-Lun Ruan, Yu-Lin Yang, Nian-Chao Zhang, Chuan Gao, Cheguo Cai, Jing Zhang, Ming-Ming Hu, Hong-Bing Shu","doi":"10.1093/jmcb/mjad047","DOIUrl":"10.1093/jmcb/mjad047","url":null,"abstract":"<p><p>Estrogen receptor α (ERα) is an important driver and therapeutic target in ∼70% of breast cancers. How ERα drives breast carcinogenesis is not fully understood. In this study, we show that ERα is a negative regulator of type I interferon (IFN) response. Activation of ERα by its natural ligand estradiol inhibits IFN-β-induced transcription of downstream IFN-stimulated genes (ISGs), whereas ERα deficiency or the stimulation with its antagonist fulvestrant has opposite effects. Mechanistically, ERα induces the expression of the histone 2A variant H2A.Z to restrict the engagement of the IFN-stimulated gene factor 3 (ISGF3) complex to the promoters of ISGs and also interacts with STAT2 to disrupt the assembly of the ISGF3 complex. These two events mutually lead to the inhibition of ISG transcription induced by type I IFNs. In a xenograft mouse model, fulvestrant enhances the ability of IFN-β to suppress ERα+ breast tumor growth. Consistently, clinical data analysis reveals that ERα+ breast cancer patients with higher levels of ISGs exhibit higher long-term survival rates. Taken together, our findings suggest that ERα inhibits type I IFN response via two distinct mechanisms to promote breast carcinogenesis.</p>","PeriodicalId":16433,"journal":{"name":"Journal of Molecular Cell Biology","volume":" ","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11066933/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9775957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The transcriptional activator Klf5 recruits p300-mediated H3K27ac for maintaining trophoblast stem cell pluripotency. 转录激活因子 Klf5 可通过 p300 介导的 H3K27ac 来维持滋养层干细胞的全能性。
IF 5.5 2区 生物学
Journal of Molecular Cell Biology Pub Date : 2024-01-05 DOI: 10.1093/jmcb/mjad045
Chengli Dou, Linhui Wu, Jingjing Zhang, Hainan He, Tian Xu, Zhisheng Yu, Peng Su, Xia Zhang, Junling Wang, Yi-Liang Miao, Jilong Zhou
{"title":"The transcriptional activator Klf5 recruits p300-mediated H3K27ac for maintaining trophoblast stem cell pluripotency.","authors":"Chengli Dou, Linhui Wu, Jingjing Zhang, Hainan He, Tian Xu, Zhisheng Yu, Peng Su, Xia Zhang, Junling Wang, Yi-Liang Miao, Jilong Zhou","doi":"10.1093/jmcb/mjad045","DOIUrl":"10.1093/jmcb/mjad045","url":null,"abstract":"<p><p>The effective proliferation and differentiation of trophoblast stem cells (TSCs) is indispensable for the development of the placenta, which is the key to maintaining normal fetal growth during pregnancy. Kruppel-like factor 5 (Klf5) is implicated in the activation of pluripotency gene expression in embryonic stem cells (ESCs), yet its function in TSCs is poorly understood. Here, we showed that Klf5 knockdown resulted in the downregulation of core TSC-specific genes, consequently causing rapid differentiation of TSCs. Consistently, Klf5-depleted embryos lost the ability to establish TSCs in vitro. At the molecular level, Klf5 preferentially occupied the proximal promoter regions and maintained an open chromatin architecture of key TSC-specific genes. Deprivation of Klf5 impaired the enrichment of p300, a major histone acetyl transferase of H3 lysine 27 acetylation (H3K27ac), and further reduced the occupancy of H3K27ac at promoter regions, leading to decreased transcriptional activity of TSC pluripotency genes. Thus, our findings highlight a novel mechanism of Klf5 in regulating the self-renewal and differentiation of TSCs and provide a reference for understanding placental development and improving pregnancy rates.</p>","PeriodicalId":16433,"journal":{"name":"Journal of Molecular Cell Biology","volume":" ","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10768793/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9927286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Transcriptional pausing induced by ionizing radiation enables the acquisition of radioresistance in nasopharyngeal carcinoma. 电离辐射诱导的转录暂停可使鼻咽癌获得放射抗性。
IF 5.5 2区 生物学
Journal of Molecular Cell Biology Pub Date : 2024-01-05 DOI: 10.1093/jmcb/mjad044
Honglu Liu, Huanyi Fu, Chunhong Yu, Na Zhang, Canhua Huang, Lu Lv, Chunhong Hu, Fang Chen, Zhiqiang Xiao, Zhuohua Zhang, Huasong Lu, Kai Yuan
{"title":"Transcriptional pausing induced by ionizing radiation enables the acquisition of radioresistance in nasopharyngeal carcinoma.","authors":"Honglu Liu, Huanyi Fu, Chunhong Yu, Na Zhang, Canhua Huang, Lu Lv, Chunhong Hu, Fang Chen, Zhiqiang Xiao, Zhuohua Zhang, Huasong Lu, Kai Yuan","doi":"10.1093/jmcb/mjad044","DOIUrl":"10.1093/jmcb/mjad044","url":null,"abstract":"<p><p>Lesions on the DNA template can impact transcription via distinct regulatory pathways. Ionizing radiation (IR) as the mainstay modality for many malignancies elicits most of the cytotoxicity by inducing a variety of DNA damages in the genome. How the IR treatment alters the transcription cycle and whether it contributes to the development of radioresistance remain poorly understood. Here, we report an increase in the paused RNA polymerase II (RNAPII), as indicated by the phosphorylation at serine 5 residue of its C-terminal domain, in recurrent nasopharyngeal carcinoma (NPC) patient samples after IR treatment and cultured NPC cells developing IR resistance. Reducing the pool of paused RNAPII by either inhibiting TFIIH-associated CDK7 or stimulating the positive transcription elongation factor b, a CDK9-CycT1 heterodimer, attenuates IR resistance of NPC cells. Interestingly, the poly(ADP-ribosyl)ation of CycT1, which disrupts its phase separation, is elevated in the IR-resistant cells. Mutation of the major poly(ADP-ribosyl)ation sites of CycT1 decreases RNAPII pausing and restores IR sensitivity. Genome-wide chromatin immunoprecipitation followed by sequencing analyses reveal that several genes involved in radiation response and cell cycle control are subject to the regulation imposed by the paused RNAPII. Particularly, we identify the NIMA-related kinase NEK7 under such regulation as a new radioresistance factor, whose downregulation results in the increased chromosome instability, enabling the development of IR resistance. Overall, our results highlight a novel link between the alteration in the transcription cycle and the acquisition of IR resistance, opening up new opportunities to increase the efficacy of radiotherapy and thwart radioresistance in NPC.</p>","PeriodicalId":16433,"journal":{"name":"Journal of Molecular Cell Biology","volume":" ","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10960568/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9746355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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