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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Cancer+Res 2014 ; 74 (14): 3695-706 Nephropedia Template TP
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Slug promotes survival during metastasis through suppression of Puma-mediated apoptosis #MMPMID24830722
Kim S; Yao J; Suyama K; Qian X; Qian BZ; Bandyopadhyay S; Loudig O; De Leon-Rodriguez C; Zhou ZN; Segall J; Macian F; Norton L; Hazan RB
Cancer Res 2014[Jul]; 74 (14): 3695-706 PMID24830722show ga
Tumor cells must overcome apoptosis to survive throughout metastatic dissemination and distal organ colonization. Here we show in the Polyoma Middle T mammary tumor model that N-cadherin expression causes Slug upregulation, which in turn promotes carcinoma cell survival. Slug was dramatically upregulated in metastases relative to primary tumors. Consistent with a role in metastasis, Slug knockdown in carcinoma cells suppressed lung colonization by decreasing cell survival at metastatic sites, but had no effect on tumor cell invasion or extravasation. In support of this idea, Slug inhibition by shRNA, sensitized tumor cells to apoptosis by DNA damage, resulting in caspase-3 and PARP cleavage. The pro-survival effect of Slug was found to be caused by direct repression of the pro-apoptotic gene, Puma, by Slug. Consistent with a pivotal role for a Slug-Puma axis in metastasis, inhibition of Puma by RNA interference in Slug-knockdown cells rescued lung colonization, whereas Puma overexpression in control tumor cells suppressed lung metastasis. The survival function of the Slug-Puma axis was confirmed in human breast cancer cells, where Slug knockdown increased Puma expression and inhibited lung colonization. This study demonstrates a pivotal role for Slug in carcinoma cell survival, implying that disruption of the Slug-Puma axis may impinge on the survival of metastatic cells.