A piRNA utilizes HILI and HIWI2 mediated pathway to down-regulate ferritin heavy chain 1 mRNA in human somatic cells.

A piRNA utilizes HILI and HIWI2 mediated pathway to down-regulate ferritin heavy chain 1 mRNA in human somatic cells.
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DOI:
10.1093/nar/gky728
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发表时间:
2018-11-16
影响因子:
14.9
通讯作者:
Basu S
Basu S
中科院分区:
生物学2区
文献类型:
--
作者:
Balaratnam S;West N;Basu S

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piwi 相互作用 RNA (piRNA) 是小的非编码 RNA,可特异性结合 PIWI 蛋白,这是一种功能要求。 piRNA 调节种系发育、转座子控制和基因表达。然而,piRNA 介导的人类体细胞转录后基因调控尚不清楚。我们发现了一种人 piRNA (piR-FTH1),它在铁蛋白重链 1 (Fth1) mRNA 中具有互补序列。我们证明 piR-FTH1 和 Fth1 的表达在测试的肿瘤细胞系中呈负相关。我们发现 piR-FTH1 在三阴性乳腺癌 (TNBC) 细胞的转录后水平负向调节 Fth1 表达。此外,我们证实转染的 piR-FTH1 通过 HIWI2 和 HILI 介导的机制敲低 Fth1 mRNA。 piR-FTH1 介导的 Fth1 抑制也使 TNBC 细胞中的阿霉素敏感性显着提高了 20 倍。由于目前 piRNA 介导的靶 mRNA 敲低主要在生殖系细胞中报道,因此 piRNA 介导的体细胞转录后基因调控在其应用中相当独特,并且在机制上使用 siRNA 和 miRNA 的替代途径。这项工作开始为治疗与具有 piRNA 靶标的特定 mRNA 水平升高有关的各种疾病的治疗产生更广泛的影响奠定基础。
The piwi interacting RNAs (piRNAs) are small non-coding RNAs that specifically bind to the PIWI proteins, a functional requirement. The piRNAs regulate germline development, transposons control, and gene expression. However, piRNA-mediated post-transcriptional gene regulation in human somatic cells is not well understood. We discovered a human piRNA (piR-FTH1) which has a complementary sequence in the ferritin heavy chain 1 (Fth1) mRNA. We demonstrated that expression of piR-FTH1 and Fth1 are inversely correlated in the tested tumor cell lines. We found that piR-FTH1 negatively regulates the Fth1 expression at post-transcriptional level in triple negative breast cancer (TNBC) cells. Additionally, we confirmed that transfected piR-FTH1 knocks down the Fth1 mRNA via the HIWI2 and HILI mediated mechanism. piR-FTH1 mediated Fth1 repression also increased doxorubicin sensitivity by a remarkable 20-fold in TNBC cells. Since the current piRNA-mediated knockdowns of target mRNA are mostly reported in germ line cells, piRNA-mediated post-transcriptional gene regulation in somatic cells is rather unique in its application and mechanistically uses an alternative pathway to siRNA and miRNA. This work begins to lay the groundwork with a broader impact on treatment of various diseases that are linked to elevated levels of specific mRNAs which have a piRNA target.
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