BTF3 confers oncogenic activity in prostate cancer through transcriptional upregulation of Replication Factor C.

BTF3 confers oncogenic activity in prostate cancer through transcriptional upregulation of Replication Factor C.
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BTF3 通过复制因子 C 的转录上调赋予前列腺癌致癌活性

DOI:
10.1038/s41419-020-03348-2
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发表时间:
2021-01-05
影响因子:
9
通讯作者:
Liu P
Liu P
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang Y;Gao X;Yi J;Sang X;Dai Z;Tao Z;Wang M;Shen L;Jia Y;Xie D;Cheng H;Liu Z;Liu P

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高水平的碱性转录因子3(BTF 3)与前列腺癌有关。然而,BTF 3作为一种致癌转录因子在前列腺肿瘤发生中的作用机制尚未研究。在此,我们报告BTF 3赋予前列腺癌细胞致癌活性。从机制上讲,虽然BTF 3剪接同种型(BTF 3a和BTF 3b)促进细胞生长,但BTF 3b而不是BTF 3a调节编码复制因子C(RFC)家族亚基的基因的转录表达,该亚基参与DNA复制和损伤修复过程。BTF 3敲低导致RFC基因表达降低,从而减弱DNA复制、DNA损伤修复缺陷和G2/M期阻滞增加。此外,RFC 3亚基的敲低降低了由BTF 3b的异位过表达所赋予的生长优势和DNA损伤修复能力。重要的是,我们发现,在前列腺癌细胞中,BTF 3的过表达诱导顺铂-DNA加合物的大量积累,并使细胞在体外和体内对顺铂治疗更敏感。这些发现为BTF 3作为前列腺癌中的致癌转录因子的作用提供了新的见解,并表明BTF 3表达水平可作为预测顺铂治疗反应的潜在生物标志物。
High levels of Basic Transcription Factor 3 (BTF3) have been associated with prostate cancer. However, the mechanisms underlying the role of BTF3 as an oncogenic transcription factor in prostate tumorigenesis have not been explored. Herein, we report that BTF3 confers oncogenic activity in prostate cancer cells. Mechanistically, while both BTF3 splicing isoforms (BTF3a and BTF3b) promote cell growth, BTF3b, but not BTF3a, regulates the transcriptional expression of the genes encoding the subunits of Replication Factor C (RFC) family that is involved in DNA replication and damage repair processes. BTF3 knockdown results in decreased expression of RFC genes, and consequently attenuated DNA replication, deficient DNA damage repair, and increased G2/M arrest. Furthermore, knockdown of the RFC3 subunit diminishes the growth advantage and DNA damage repair capability conferred by ectopic overexpression of BTF3b. Importantly, we show that enforced BTF3 overexpression in prostate cancer cells induces substantial accumulation of cisplatin-DNA adducts and render the cells more sensitive to cisplatin treatment both in vitro and in vivo. These findings provide novel insights into the role of BTF3 as an oncogenic transcription factor in prostate cancer and suggest that BTF3 expression levels may serve as a potential biomarker to predict cisplatin treatment response.
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