Department of Nephrology and Hypertension, Universitätsklinikum Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Ulmenweg 18, 91054 Erlangen, Germany.
NDM Research Building, University of Oxford, Old Road Campus, Headington, Oxford OX3 7FZ, United Kingdom.
J Biol Chem. 2020 Mar 27;295(13):4065-4078. doi: 10.1074/jbc.RA119.009827. Epub 2019 Nov 5.
Hypoxia-inducible transcription factors (HIFs) directly dictate the expression of multiple RNA species including novel and as yet uncharacterized long noncoding transcripts with unknown function. We used pan-genomic HIF-binding and transcriptomic data to identify a novel long noncoding RNA oncoding ntergenic o-nduced transcript (NICI) on chromosome 12p13.31 which is regulated by hypoxia via HIF-1 promoter-binding in multiple cell types. CRISPR/Cas9-mediated deletion of the hypoxia-response element revealed co-regulation of NICI and the neighboring protein-coding gene, solute carrier family 2 member 3 () which encodes the high-affinity glucose transporter 3 (GLUT3). Knockdown or knockout of NICI attenuated hypoxic induction of SLC2A3, indicating a direct regulatory role of NICI in SLC2A3 expression, which was further evidenced by CRISPR/Cas9-VPR-mediated activation of NICI expression. We also demonstrate that regulation of is mediated through transcriptional activation rather than posttranscriptional mechanisms because knockout of NICI leads to reduced recruitment of RNA polymerase 2 to the promoter. Consistent with this we observe NICI-dependent regulation of glucose consumption and cell proliferation. Furthermore, NICI expression is regulated by the von Hippel-Lindau (VHL) tumor suppressor and is highly expressed in clear cell renal cell carcinoma (ccRCC), where SLC2A3 expression is associated with patient prognosis, implying an important role for the HIF/NICI/SLC2A3 axis in this malignancy.
缺氧诱导转录因子 (HIFs) 直接调控多种 RNA 种类的表达,包括具有未知功能的新型和尚未鉴定的长非编码转录本。我们使用全基因组 HIF 结合和转录组数据,在 12p13.31 染色体上鉴定了一个新的长非编码 RNA 癌基因间诱导转录本 (NICI),该转录本受缺氧通过 HIF-1 启动子结合在多种细胞类型中的调节。CRISPR/Cas9 介导的缺氧反应元件缺失揭示了 NICI 与邻近的蛋白编码基因溶质载体家族 2 成员 3 () 的共同调节,该基因编码高亲和力葡萄糖转运蛋白 3 (GLUT3)。NICI 的敲除或敲除减弱了 SLC2A3 的缺氧诱导,表明 NICI 对 SLC2A3 表达具有直接调节作用,这进一步通过 CRISPR/Cas9-VPR 介导的 NICI 表达激活得到证实。我们还证明了 的调节是通过转录激活而不是转录后机制介导的,因为 NICI 的敲除导致 RNA 聚合酶 2 向 启动子的募集减少。与此一致,我们观察到 NICI 依赖性调节葡萄糖消耗和细胞增殖。此外,NICI 的表达受 von Hippel-Lindau (VHL) 肿瘤抑制因子的调节,在透明细胞肾细胞癌 (ccRCC) 中高度表达,其中 SLC2A3 的表达与患者预后相关,这意味着 HIF/NICI/SLC2A3 轴在这种恶性肿瘤中具有重要作用。