Liu Xiao-Wei, Xu Hao-Wei, Zhang Shu-Bao, Yi Yu-Yang, Chang Sheng-Jie, Wang Shan-Jin
Department of Spinal Surgery, Shanghai East Hospital, School of Medicine, Tongji University, 200092, Shanghai, China.
Cell Death Discov. 2025 Jun 4;11(1):267. doi: 10.1038/s41420-025-02515-8.
Intervertebral disc degeneration (IVDD) is a common pathology involving various degenerative diseases of the spine, with nucleus pulposus cell (NPC) senescence playing an important role in its pathogenesis. Transcriptional and epigenetic processes have been increasingly implicated in aging and longevity. E74-like factor 1 (ELF1) is a member of the erythroblast transformation specific family of proteins, which induce gene transcription by binding to gene promoters or enhancer sequences. However, the role of ELF1 in age-related diseases is unclear, with no reports of its involvement in NPC senescence or IVDD. ELF1 expression levels were assessed in human NP samples from IVDD patients, IVDD animal models, and naturally aged NP samples. Adeno-associated virus 5 (AAV5) vector-mediated Elf1 overexpressing mice and Elf1 knockout (KO) mice were used to investigate its role in NPC senescence and IVDD in vivo. The m6A methylase METTL3 and reading protein YTHDF2 were identified as downstream effectors of ELF1 using proteomic sequencing, RNA sequencing, ChIP-seq, promoter prediction, and binding analyses. MepRIP-qPCR, RNA pulldown, and double luciferase point mutation experiments revealed that METTL3 and YTHDF2 can recognize the m6A site on E2F3 mRNA, a key cell cycle gene. Finally, virtual screening techniques and various experiments were used to identify small molecule targets for ELF1 inhibition. ELF1 was found to drive m6A modification changes during NPC aging. The small molecule mycophenolate mofetil (MMF) could successfully target and inhibit ELF1 expression. In senescent NPCs, ELF1 can bind to the METTL3 and YTHDF2 gene promoter regions. Overexpressing METTL3 increased the E2F3 mRNA m6A modification abundance, while YTHDF2 was recruited to recognize this m6A site. This can accelerate the E2F3 mRNA degradation rate and ultimately lead to the onset of G1/S cell cycle arrest in NPC. For the first time, the transcription factor ELF1 has been identified as a novel regulator of NPC senescence and IVDD, which involves the ELF1-METTL3/YTHDF2-m6A-E2F3 axis. MMF, a small molecule designed to inhibit ELF1 and delay NPC senescence, was screened for the first time. This can potentially lead to new epigenetic therapeutic strategies for drug discovery and development for the clinical treatment of IVDD.
椎间盘退变(IVDD)是一种常见的病理状态,涉及脊柱的多种退行性疾病,其中髓核细胞(NPC)衰老在其发病机制中起重要作用。转录和表观遗传过程越来越多地与衰老和长寿相关。E74样因子1(ELF1)是成红细胞转化特异性蛋白家族的成员,它通过与基因启动子或增强子序列结合来诱导基因转录。然而,ELF1在与年龄相关疾病中的作用尚不清楚,尚无其参与NPC衰老或IVDD的报道。在来自IVDD患者的人NP样本、IVDD动物模型和自然衰老的NP样本中评估了ELF1的表达水平。使用腺相关病毒5(AAV5)载体介导的Elf1过表达小鼠和Elf1基因敲除(KO)小鼠来研究其在体内NPC衰老和IVDD中的作用。通过蛋白质组测序、RNA测序、ChIP-seq、启动子预测和结合分析,确定m6A甲基转移酶METTL3和阅读蛋白YTHDF2为ELF1的下游效应因子。MepRIP-qPCR、RNA下拉和双荧光素酶点突变实验表明,METTL3和YTHDF2可以识别关键细胞周期基因E2F3 mRNA上的m6A位点。最后,使用虚拟筛选技术和各种实验来鉴定抑制ELF1的小分子靶点。发现ELF1在NPC衰老过程中驱动m6A修饰变化。小分子霉酚酸酯(MMF)可以成功靶向并抑制ELF1表达。在衰老的NPC中,ELF1可以与METTL3和YTHDF2基因启动子区域结合。过表达METTL3可增加E2F3 mRNA的m6A修饰丰度,而YTHDF2被招募来识别这个m6A位点。这可以加速E2F3 mRNA的降解速率,并最终导致NPC中G1/S细胞周期停滞的发生。首次将转录因子ELF1鉴定为NPC衰老和IVDD的新型调节因子,其涉及ELF1-METTL3/YTHDF2-m6A-E2F3轴。首次筛选出旨在抑制ELF1并延缓NPC衰老的小分子MMF。这可能为IVDD临床治疗的药物发现和开发带来新的表观遗传治疗策略。
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