OS-1 组蛋白 H1.4 乳酸化激活 MZF1 促进肝细胞癌进展 安娜·阚 1,黄叶星 1,赖志成 1,何敏科 1,石明 1 1 中山大学肿瘤防治中心,广州,中国 电子邮件:annakan@sysucc.org.cn 背景与目的:细胞内乳酸诱导的核心组蛋白赖氨酸乳酸化(Kla)驱动致癌过程。在本研究中,我们探讨 Kla 对组蛋白 H1.4 的调控以及其对致癌基因 MZF1 和肝细胞癌进展的调控。 方法:进行 ChIP-seq、ATAC-seq、RNA-seq 和 snRNA-seq 的交叉分析,以在肝癌细胞系和患者样本中寻找 Kla 靶基因。分选出 MZF1 并用 ChIP PCR 进行验证。然后构建了体外和体内实验来验证Kla和MZF1对HCC行为的作用。采用DNA pull down分析结合质谱技术来寻找MZF1的上游调节剂。识别了组蛋白H1.4,并通过ChIP PCR识别其与MZF1启动子区的直接结合。利用RNA-seq和scRNA-seq数据来搜索MZF1的下游通路。结果:对有肺转移(M1)或无肺转移(M0)的HCC患者的肿瘤活检样本进行单核RNA测序。鉴定出14个HCC细胞簇(图1A)。调节葡萄糖稳态、碳水化合物稳态、调节糖酵解过程和正向调节Wnt信号通路的通路在M1组特异性簇中富集(图1B)。因此,检查了糖酵解产物乳酸和乳酸刺激的Kla的影响。细胞功能实验显示乳酸可以增强细胞迁移(图1C)和侵袭(图1D),而乳酸抑制剂则抑制细胞功能(图1E、1F)。构建体内模型,结果与体外实验一致(图1G-1L)。随后进行多组学分析,揭示乳酸刺激的Kla的下游调控,唯一重叠的靶点为MZF1(图1M、1N)。WB结果显示在HCC细胞系(图1O、1P)和体内模型(图2B、2C)中,MZF1在乳酸和葡萄糖处理后增加,在OXA和DCA处理后降低。CUT和Tag qPCR验证了Kla在MZF1启动子区的结合(图2A)。质谱结果显示组蛋白H1.4是MZF1 DNA的直接结合蛋白(图2D)。 CUT和Tag qPCR对突变的H1.4残基进行检测,证实了其与MZF1启动子区的结合,其中K90残基的突变最为显著(图2E)。富集分析表明,在136个差异基因中,Wnt信号富集(图2F,2G)。乳酸和/或FX-11处理的HCC细胞的WB结果(图2H,2I)也证实了这一点。结论:我们发现了乳酸刺激Kla对HCC转移的潜在机制。组蛋白H1.4乳酸化直接结合在MZF1启动子区可能有助于其活化,促进HCC细胞的增殖和转移(图2J)。图:
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