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
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影响因子:
--
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中科院分区:
文献类型:
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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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影响因子:
3.7
作者:
Agarwal R;Mori Y;Cheng Y;Jin Z;Olaru AV;Hamilton JP;David S;Selaru FM;Yang J;Abraham JM;Montgomery E;Morin PJ;Meltzer SJ
通讯作者:
Meltzer SJ
影响因子:
14.9
作者:
Swarbreck, David;Wilks, Christopher;Lamesch, Philippe;Berardini, Tanya Z.;Garcia-Hernandez, Margarita;Foerster, Hartmut;Li, Donghui;Meyer, Tom;Muller, Robert;Ploetz, Larry;Radenbaugh, Amie;Singh, Shanker;Swing, Vanessa;Tissier, Christophe;Zhang, Peifen;Huala, Eva
通讯作者:
Huala, Eva
影响因子:
11.2
作者:
Adiseshaiah, Pavan;Lindner, Daniel J.;Reddy, Sekhar P.
通讯作者:
Reddy, Sekhar P.
影响因子:
7.5
作者:
Bres, Vanessa;Yoh, Sunnie M.;Jones, Katherine A.
通讯作者:
Jones, Katherine A.
影响因子:
11.5
作者:
Hamilton, James P.;Sato, Fumiaki;Meltzer, Stephen J.
通讯作者:
Meltzer, Stephen J.