Insulin receptor substrate-1 associates with small nucleolar RNA which contributes to ribosome biogenesis.

Insulin receptor substrate-1 associates with small nucleolar RNA which contributes to ribosome biogenesis.
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DOI:
10.3389/fendo.2014.00024
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发表时间:
2014
影响因子:
5.2
通讯作者:
Takahashi S
Takahashi S
中科院分区:
医学2区
文献类型:
--
作者:
Ozoe A;Sone M;Fukushima T;Kataoka N;Chida K;Asano T;Hakuno F;Takahashi S

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众所周知,胰岛素受体底物(IRS)在介导胰岛素样生长因子(IGF)/胰岛素的细胞内信号中发挥着至关重要的作用。之前,我们证明 IRS-1 形成含有 RNA 的高分子复合物。为了鉴定 IRS-1 复合物中的 RNA,我们使用表达 FLAG–IRS-1 和 FLAG–IRS-2 的 HEK293 细胞进行了紫外线 (UV) 交联和免疫沉淀分析。我们在 FLAG-IRS-1 的免疫沉淀物中检测到与紫外线照射成比例的放射性信号,但在 FLAG-IRS-2 的免疫沉淀物中未检测到放射性信号,这表明 RNA 与 IRS-1 直接接触。然后通过 RT-PCR 扩增与 IRS-1 交联的 RNA,然后进行序列分析。我们分离出 25 种信使 RNA 和 8 种非编码 RNA 的序列标签,包括小核仁 RNA (snoRNA)。我们重点关注 IRS-1 与 U96A snoRNA (U96A) 及其宿主 Rack1(激活 C 激酶 1 的受体)前 mRNA 的相互作用。我们通过 IRS-1 免疫沉淀随后进行 Northern 印迹或 RT-PCR 分析,证实了 IRS-1 与 U96A 以及与 RACK1 前 mRNA 的相互作用。 IRS-1−/−小鼠胚胎成纤维细胞中成熟的U96A在数量上低于WT。我们还发现核 IRS-1 的一部分位于卡哈尔体(Cajal body)中,卡哈尔体是 snoRNA 成熟的核亚区室。 IRS-1 在 snoRNA 生物发生中的意想不到的功能凸显了 RNA 相关 IRS-1 复合物的潜力,开辟了一条新的研究路线,以剖析调节 IGF/胰岛素介导的生物事件的新机制。
Insulin receptor substrates (IRSs) are well known to play crucial roles in mediating intracellular signals of insulin-like growth factors (IGFs)/insulin. Previously, we showed that IRS-1 forms high molecular mass complexes containing RNAs. To identify RNAs in IRS-1 complexes, we performed ultraviolet (UV) cross-linking and immunoprecipitation analysis using HEK293 cells expressing FLAG–IRS-1 and FLAG–IRS-2. We detected the radioactive signals in the immunoprecipitates of FLAG–IRS-1 proportional to the UV irradiation, but not in the immunoprecipitates of FLAG–IRS-2, suggesting the direct contact of RNAs with IRS-1. RNAs cross-linked to IRS-1 were then amplified by RT-PCR, followed by sequence analysis. We isolated sequence tags attributed to 25 messenger RNAs and 8 non-coding RNAs, including small nucleolar RNAs (snoRNAs). We focused on the interaction of IRS-1 with U96A snoRNA (U96A) and its host Rack1 (receptor for activated C kinase 1) pre-mRNA. We confirmed the interaction of IRS-1 with U96A, and with RACK1 pre-mRNA by immunoprecipitation with IRS-1 followed by Northern blotting or RT-PCR analyses. Mature U96A in IRS-1−/− mouse embryonic fibroblasts was quantitatively less than WT. We also found that a part of nuclear IRS-1 is localized in the Cajal body, a nuclear subcompartment where snoRNA mature. The unanticipated function of IRS-1 in snoRNA biogenesis highlights the potential of RNA-associated IRS-1 complex to open a new line of investigation to dissect the novel mechanisms regulating IGFs/insulin-mediated biological events.
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发表时间: 2002-05-10
影响因子: 4.8
作者:
Lassak, A;Del Valle, L;Reiss, K
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DOI: 10.1074/jbc.m504516200
发表时间: 2005-08-19
影响因子: 4.8
作者:
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