MiR-27b targets PPARγ to inhibit growth, tumor progression and the inflammatory response in neuroblastoma cells.

MiR-27b targets PPARγ to inhibit growth, tumor progression and the inflammatory response in neuroblastoma cells.
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DOI:
10.1038/onc.2011.543
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发表时间:
2012-08-16
期刊:
影响因子:
8
通讯作者:
Struhl, K.
Struhl, K.
中科院分区:
医学1区
文献类型:
--
作者:
Lee, J-J;Drakaki, A.;Iliopoulos, D.;Struhl, K.

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PPARγ核受体途径参与癌症,但它似乎同时具有肿瘤抑制和致癌功能。在神经母细胞瘤细胞中,miR-27b靶向PPARγ的3'UTR并抑制其mRNA和蛋白的表达。miR-27b过表达或PPARγ抑制可阻断体外细胞生长和小鼠异种移植物的肿瘤生长。PPARγ激活pH调节因子NHE1的表达,这与肿瘤进展有关。最后,miR-27b通过PPARγ调节NF-κB活性和炎症靶基因的转录。因此,在神经母细胞瘤中,miR-27b通过抑制PPARγ的促肿瘤功能发挥肿瘤抑制作用,从而引发炎症反应的增加。相反,在乳腺癌细胞中,PPARγ抑制NHE1表达和炎症反应,并发挥肿瘤抑制作用。我们认为PPARγ促进或抑制肿瘤形成的能力与NHE1和其他靶基因调控的细胞类型特异性差异有关。
The PPARγ nuclear receptor pathway is involved in cancer, but it appears to have both tumor suppressor and oncogenic functions. In neuroblastoma cells, miR-27b targets the 3′UTR of PPARγ and inhibits its mRNA and protein expression. miR-27b overexpression or PPARγ inhibition blocks cell growth in vitro and tumor growth in mouse xenografts. PPARγ activates expression of the pH regulator NHE1, which is associated with tumor progression. Lastly, miR-27b through PPARγ regulates NF-κB activity and transcription of inflammatory target genes. Thus, in neuroblastoma, miR-27b functions as a tumor suppressor by inhibiting the tumor-promoting function of PPARγ, which triggers an increased inflammatory response. In contrast, in breast cancer cells, PPARγ inhibits NHE1 expression and the inflammatory response, and it functions as a tumor suppressor. We suggest that the ability of PPARγ to promote or suppress tumor formation is linked to cell-type specific differences in regulation of NHE1 and other target genes.
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