柴草皂苷D通过HIF1α/HDAC5通路诱导MRE11去乳酸化减轻三阴性乳腺癌的放射耐药

IF 13.3 1区 医学 Q1 MEDICINE, RESEARCH & EXPERIMENTAL
Theranostics Pub Date : 2025-08-11 eCollection Date: 2025-01-01 DOI:10.7150/thno.113517
Jingyi Li, Liang Feng, Lei Zhang, Weiguo Zhang, Yanting Zhang, Xiaoqin Liu, Qianqian Cai, Weiming Zhao, Gang Huang, Changlian Lu
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引用次数: 0

摘要

背景:三阴性乳腺癌(TNBC)是最具侵袭性的乳腺癌亚型,由于放疗抵抗,预后较差。然而,潜在的机制和有效的治疗药物仍然难以捉摸。方法:我们使用乳酸/草酸盐来评估辐照TNBC细胞系的DNA损伤/修复。使用MRE11/HDAC5构建体慢病毒载体和shRNA,通过Western blot/Co-IP检测乳酸化过程。利用TCGA数据挖掘、组织微阵列、蛋白质组学-质谱和基因表达谱分析了柴草皂苷D (Saikosaponin D, SSD)的放射致敏机制。通过启动子荧光素酶测定和ChIP-qPCR检测ssd诱导的hhdac5启动子上的HIF1α结合位点。结果:放射耐药TNBC细胞内源性乳酸升高通过MRE11 Lys673乳酸化促进DNA修复,这是一种赋予放射耐药的关键修饰。通过HADDOCK对接(MRE11 Lys673与HDAC5 Ser18之间的氢键)和Co-IP (HDAC5过表达减少K673的乳酸化)验证,HDAC5被鉴定为MRE11 Lys673的关键去乙酰化酶。TCGA和临床组织芯片证实HDAC5在TNBC中下调。SSD通过上调HDAC5抑制MRE11乳酸化,抑制TNBC恶性表型,提高放疗疗效。机制上,SSD上调HIF1α结合HDAC5启动子(-342bp至-20bp区域)激活其表达。结论:乳酸驱动的MRE11 Lys673乳酸化介导辐射耐药,而SSD通过HIF1α/HDAC5轴激活逆转这一过程。我们的研究结果确定SSD是一种放射增敏剂,HDAC5/MRE11是TNBC的潜在治疗靶点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Saikosaponin D Mitigates Radioresistance in Triple-Negative Breast Cancer by Inducing MRE11 De-Lactylation via HIF1α/HDAC5 Pathway.

Background: Triple-negative breast cancer (TNBC), the most aggressive breast cancer subtype, exhibits poor prognosis due to radiotherapy resistance. However, the underlying mechanisms and effective therapeutic agents remain elusive. Methods: We employed lactate/oxamate to assess DNA damage/repair in irradiated TNBC cell lines. Lentiviral vectors for MRE11/HDAC5 constructs and shRNA were used to explore lactylation via Western blot/Co-IP. TCGA data mining, tissue microarrays, proteomics-MS, and gene expression profiling were used to dissect Saikosaponin D (SSD)'s radiosensitizing mechanisms. Promoter luciferase assays and ChIP-qPCR were performed to map SSD-induced HIF1α binding sites on the HDAC5 promoter. Results: Elevated endogenous lactate in radioresistant TNBC cells promoted DNA repair via MRE11 Lys673 lactylation, a critical modification conferring radioresistance. HDAC5 was identified as the key delactylase for MRE11 Lys673, validated by HADDOCK docking (hydrogen bond between MRE11 Lys673 and HDAC5 Ser18) and Co-IP (HDAC5 overexpression reduced K673 lactylation). TCGA and clinical tissue microarrays confirmed HDAC5 downregulation in TNBC. SSD inhibits the malignant phenotype of TNBC and enhances radiotherapy efficacy by inhibition on MRE11 lactylation via upregulating HDAC5. Mechanistically, SSD upregulated HIF1α to bind the HDAC5 promoter (-342bp to -20bp region) to activate its expression. Conclusion: Lactate-driven MRE11 Lys673 lactylation mediates radioresistance, while SSD reverses this via HIF1α/HDAC5 axis activation. Our findings identify SSD as a radiosensitizer and HDAC5/MRE11 as potential therapeutic targets for TNBC.

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来源期刊
Theranostics
Theranostics MEDICINE, RESEARCH & EXPERIMENTAL-
CiteScore
25.40
自引率
1.60%
发文量
433
审稿时长
1 months
期刊介绍: Theranostics serves as a pivotal platform for the exchange of clinical and scientific insights within the diagnostic and therapeutic molecular and nanomedicine community, along with allied professions engaged in integrating molecular imaging and therapy. As a multidisciplinary journal, Theranostics showcases innovative research articles spanning fields such as in vitro diagnostics and prognostics, in vivo molecular imaging, molecular therapeutics, image-guided therapy, biosensor technology, nanobiosensors, bioelectronics, system biology, translational medicine, point-of-care applications, and personalized medicine. Encouraging a broad spectrum of biomedical research with potential theranostic applications, the journal rigorously peer-reviews primary research, alongside publishing reviews, news, and commentary that aim to bridge the gap between the laboratory, clinic, and biotechnology industries.
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