染色素绝缘调节矩阵金属蛋白酶基因群表达重编程在侵袭性乳腺癌瘤中
Pere Llinàs-Arias1, Miquel Ensenyat-Mendez1, Sandra Íñiguez-Muñoz1
1Cancer Epigenetics Laboratory, Health Research Institute of the Balearic Islands (IdISBa), Palma, 07120, Spain.
Molecular cancer
|November 29, 2023
概括
这项研究揭示了MMP8基因附近的绝缘体元素如何调节矩阵金属蛋白酶 (MMP) 基因,影响三阴性乳腺癌 (TNBC) 侵袭. 修改这个元素减少了癌细胞的侵入性,并预测了疾病的进展.
科学领域:
- 基因组学和表观遗传学
- 癌症生物学 癌症生物学
- 分子瘤学分子瘤学
背景情况:
- 三阴性乳腺癌 (TNBC) 是具有攻击性,易转移的,缺乏向治疗.
- 瘤入侵,转移的初始步骤,与失调的矩阵金属蛋白酶 (MMPs) 有关.
- 在TNBC入侵中影响MMP失调的表观遗传机制需要进一步调查.
研究的目的:
- 为了研究MMPs在TNBC入侵中的表观遗传调节.
- 确定控制MMP基因表达的绝缘体元素及其在瘤转移中的作用.
- 评估MMP表达模式在预测乳腺癌进展方面的潜力.
主要方法:
- 结合RNA表达和染色质相互作用数据以识别与MMP相关的绝缘体元素.
- 在TNBC模型中利用CRISPR/Cas9来破坏MMP8基因下游的特定绝缘体元素 (IE8).
- 使用Hi-C,ATAC-seq和RNA-seq,以及功能分析,以描述细胞模型和侵入能力.
- 通过在位管道癌 (DCIS) 的临床标本进行验证的发现.
主要成果:
- 在Chr11q22.2确定了一个绝缘体元素 (IE8),作为拓关联域 (TAD) 边界,将9个MMP基因分隔成不同的表达集群.
- 干扰IE8改变了MMP表达,降低了对侵袭性MMP1的调节,并提高了抗瘤MMP8的调节,从而减少了癌细胞的入侵和原降解.
- 鉴定到的MMP表达模式与TNBC患者的无复发和整体存活率较差有显著的相关性.
- MMP表达模式有效地预测了DCIS向侵入性导管癌的进展.
结论:
- 在MMP8附近激活IE8绝缘元件驱动了具有相反功能的MMP基因的区域转录调节.
- 这种MMP的表观遗传调节显著影响了侵袭性乳腺癌的侵袭性质.
- 针对这些表观遗传调节器为TNBC提供了潜在的治疗策略.
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