Vimentin Regulates Alternative Polyadenylation and mTOR Signaling via ARVCF to Promote B Cell Lymphoma Progression

IF 3.7 2区 医学 Q2 GENETICS & HEREDITY
Lujing Shao, Qianke Xing, Yao Xiong, Kaidi Jin, Qi Li, Chunyan Dong, Qianling Ye
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引用次数: 0

Abstract

Background: Vimentin (VIM), a cytoskeletal protein implicated in tumor progression, has been associated with poor prognosis in B cell lymphomas. Alternative polyadenylation (APA), a posttranscriptional mechanism that modulates mRNA isoforms via 3 UTR length changes, is frequently dysregulated in cancer. The interaction between VIM and APA in B cell lymphoma remains poorly understood.

Methods: We performed RNA-seq, APA analysis (DaPars), and proteomic profiling in wild-type and VIM-knockout (VIM-KO) B cell lymphoma cells (A20 and M12). Functional assays including CCK-8, EdU, Western blot, and ARVCF overexpression were used to explore the regulatory axis involving APA and mTOR signaling.

Results: VIM deletion in B cell lymphoma cells triggered widespread transcriptome remodeling, inducing 4089 APA shortening events that preferentially targeted prosurvival pathways, for example, mTORC1, G2-M checkpoint. Strikingly, RRAGA—a critical mTOR activator—underwent 3 UTR shortening, concomitant with ARVCF downregulation in proteomic profiles. Functional rescue experiments demonstrated ARVCF’s dual role in maintaining RRAGA 3 UTR length and suppressing mTOR-EIF4G1 signaling, ultimately inhibiting lymphoma proliferation.

Conclusion: This study reveals a novel VIM–ARVCF–RRAGA–mTOR axis in B cell lymphoma, linking cytoskeletal disruption to APA-mediated oncogenic signaling. VIM loss drives APA shortening and mTOR activation via ARVCF downregulation, promoting lymphoma progression. These findings offer mechanistic insight and potential targets for therapeutic intervention.

Abstract Image

Vimentin通过ARVCF调节选择性聚腺苷化和mTOR信号传导促进B细胞淋巴瘤进展
背景:Vimentin (VIM)是一种与肿瘤进展有关的细胞骨架蛋白,与B细胞淋巴瘤的不良预后有关。选择性多聚腺苷化(APA)是一种通过3 ' UTR长度变化调节mRNA亚型的转录后机制,在癌症中经常失调。VIM和APA在B细胞淋巴瘤中的相互作用尚不清楚。方法:对野生型和vim敲除(VIM-KO) B细胞淋巴瘤细胞(A20和M12)进行RNA-seq、APA分析(DaPars)和蛋白质组学分析。功能分析包括CCK-8、EdU、Western blot和ARVCF过表达来探索涉及APA和mTOR信号的调控轴。结果:B细胞淋巴瘤细胞中VIM缺失引发广泛的转录组重塑,诱导4089 APA缩短事件,优先靶向促生存通路,如mTORC1, G2-M检查点。引人注目的是,rraga -一个关键的mTOR激活因子-经历了3 ' UTR缩短,同时在蛋白质组学谱中伴有ARVCF下调。功能救援实验证明ARVCF在维持raga 3 ' UTR长度和抑制mTOR-EIF4G1信号传导方面具有双重作用,最终抑制淋巴瘤增殖。结论:本研究揭示了B细胞淋巴瘤中一个新的VIM-ARVCF-RRAGA-mTOR轴,将细胞骨架破坏与apa介导的致癌信号传导联系起来。VIM缺失通过ARVCF下调驱动APA缩短和mTOR激活,促进淋巴瘤进展。这些发现为治疗干预提供了机制和潜在的靶点。
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来源期刊
Human Mutation
Human Mutation 医学-遗传学
CiteScore
8.40
自引率
5.10%
发文量
190
审稿时长
2 months
期刊介绍: Human Mutation is a peer-reviewed journal that offers publication of original Research Articles, Methods, Mutation Updates, Reviews, Database Articles, Rapid Communications, and Letters on broad aspects of mutation research in humans. Reports of novel DNA variations and their phenotypic consequences, reports of SNPs demonstrated as valuable for genomic analysis, descriptions of new molecular detection methods, and novel approaches to clinical diagnosis are welcomed. Novel reports of gene organization at the genomic level, reported in the context of mutation investigation, may be considered. The journal provides a unique forum for the exchange of ideas, methods, and applications of interest to molecular, human, and medical geneticists in academic, industrial, and clinical research settings worldwide.
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