Superenhancer drives a tumor-specific splicing variant of MARCO to promote triple-negative breast cancer progression.

Superenhancer drives a tumor-specific splicing variant of MARCO to promote triple-negative breast cancer progression.
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超级增强子驱动 MARCO 的肿瘤特异性剪接变体促进三阴性乳腺癌进展

DOI:
10.1073/pnas.2207201119
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发表时间:
2022-11-16
影响因子:
11.1
通讯作者:
--
中科院分区:
综合性期刊1区
文献类型:
--
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三阴性乳腺癌(TNBC)是一种缺乏靶向治疗的侵袭性乳腺癌亚型。由于TNBC的转录本变异尚未被发现,我们对RNA剪接进行了系统的分析。我们发现了一种致癌转录物,巨噬细胞受体与胶原结构-肿瘤特异性转录物(MARCO-TST),它在TNBC肿瘤细胞中特异性表达并激活缺氧途径。我们还发现brd4结合的超增强子驱动MARCO-TST的转录。BET抑制剂导致MARCO-TST功能和转录活性的持续抑制。我们的研究为TNBC提供了一种抑制MARCO-TST活性的潜在治疗策略。
Significance Triple-negative breast cancer (TNBC) is an aggressive subtype of breast cancer lacking targeted therapy. Since the transcript variation in TNBC remains unexplored, we performed systematic analysis of RNA splicing. We identified an oncogenic transcript, macrophage receptor with collagenous structure–tumor-specific transcript (MARCO-TST), which is specifically expressed in TNBC tumor cells and activates the hypoxia pathway. We also illustrated that BRD4-bound superenhancer drives the transcription of MARCO-TST. BET inhibitors result in sustained repression of MARCO-TST function and transcriptional activity. Our study provides a potential therapeutic strategy of TNBC to restrain MARCO-TST activity.
三阴性乳腺癌的基因组和转录组景观:亚型和治疗策略
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