LARP7 is a potential tumor suppressor gene in gastric cancer.

LARP7 is a potential tumor suppressor gene in gastric cancer.
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DOI:
10.1038/labinvest.2012.59
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发表时间:
2012-07
期刊:
Laboratory investigation; a journal of technical methods and pathology
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其他
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我们之前报道了胃癌 (GC) 中 RNA 结合蛋白基因 La 核糖核蛋白结构域家族成员 7 (LARP7) 的频繁截短突变,并伴有频繁的微卫星不稳定。 LARP7 通过结合并稳定 7sk RNA 来负向调节正转录延伸因子-b (p-TEFb)。 p-TEFb 与多种组织的增殖和去分化有关。因此,我们推断LARP7的缺失可能导致胃肿瘤的发生。在当前的研究中,我们评估了 18 个 GC、其相应的非肿瘤性胃组织 (NGC) 和来自健康个体 (NN) 的 18 个正常胃组织 (NN) 中的 LARP7 mRNA 表达。我们还评估了瞬时 siRNA 介导的 LARP7 敲低对永生化非肿瘤性胃上皮细胞的影响。相对于 NN(中位数 14.9,p<0.01)及其相应的 NGC(中位数 8.1,p<0.01),GC 中的 LARP7 mRNA 显着降低(中位数 2.5)。相对于对照 siRNA,转染针对 LARP7 的 siRNA(抗 LARP7 siRNA)可将 7sk 水平降低 72%(p<0.01)。此外,相对于对照siRNA转染,抗LARP7 siRNA转染使细胞增殖增加23% (p<0.01),细胞迁移增加22% (p<0.001)。综上所述,这些发现表明 LARP7 下调发生在胃肿瘤发生的早期,并可能通过 p-TEFb 失调促进胃肿瘤发生。
We previously reported frequent truncating mutation of the RNA binding protein gene, La ribonucleoprotein domain family, member 7 (LARP7) in gastric cancers (GC) with frequent microsatellite instability. LARP7 negatively regulates positive transcription elongation factor-b (p-TEFb) by binding to and stabilizing 7sk RNA. p-TEFb has been linked to proliferation and de-differentiation in various tissues. Therefore, we reasoned that loss of LARP7 may contribute to gastric tumorigenesis. In the current study, we evaluated LARP7 mRNA expression in 18 GCs, their corresponding non-neoplastic gastric tissues (NGC), and 18 normal gastric tissues from healthy individuals (NN).We also assessed the effects of transient siRNA-mediated LARP7 knockdown in immortalized non-neoplastic gastric epithelial cells. LARP7 mRNA was significantly decreased in GCs (median 2.5) relative to NNs (median 14.9, p<0.01) as well as relative to their corresponding NGCs (median 8.1, p<0.01). Transfection of a siRNA directed against LARP7 (anti-LARP7 siRNA) decreased 7sk levels by 72% relative to a control siRNA (p<0.01). Furthermore, anti-LARP7 siRNA transfection increased cell proliferation by 23% (p<0.01) and cell migration by 22% (p<0.001) relative to control siRNA transfection. Taken together, these findings suggest that LARP7 downregulation occurs early during gastric tumorigenesis and may promote gastric tumorigenesis via p-TEFb deregulation.
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