SASP mediates chemoresistance and tumor-initiating-activity of mesothelioma cells.

Abstract:

:Here we show that pemetrexed-treated mesothelioma cells undergo accelerated senescence. This is characterized by the secretion of proinflammatory and mitogenic cytokines, reminiscent of an SASP (senescence-associated secretory phenotype). Conditioned media from senescent MPM (malignant pleural mesothelioma) cells trigger the emergence of EMT (epithelial-to-mesenchymal)-like, clonogenic and chemoresistant cell subpopulations, expressing high levels of ALDH (aldehyde dehydrogenase) activity (ALDH(bright) cells). We show by fluorescence-activated cell sorting of purified ALDH(bright) and ALDH(low) cells, that both cell-autonomous and cell-non-autonomous mechanisms converge to maintain the SASP-induced, EMT-like cell subpopulations. Chemoresistant ALDH(bright) cells exist within primary MPM specimens and enrichment for ALDH(bright) cells correlates with an earlier tumor onset into NOD/SCID mice. We show that RAS(v12) expression induces SASP-like changes in untransformed human mesothelial cells, and that p53 ablation increases the effect of RAS(v12) expression. We identify STAT3 activation as a crucial event downstream to SASP signaling. In fact, small hairpin RNA-mediated ablation of STAT3 deeply attenuates the induction of EMT genes and the increase of ALDH(bright) cells induced by SASP-cytokines. This strongly affects the chemoresistance of MPM cells in vitro and leads to anticancer effects in vivo.

journal_name

Oncogene

journal_title

Oncogene

authors

Canino C,Mori F,Cambria A,Diamantini A,Germoni S,Alessandrini G,Borsellino G,Galati R,Battistini L,Blandino R,Facciolo F,Citro G,Strano S,Muti P,Blandino G,Cioce M

doi

10.1038/onc.2011.485

subject

Has Abstract

pub_date

2012-06-28 00:00:00

pages

3148-63

issue

26

eissn

0950-9232

issn

1476-5594

pii

onc2011485

journal_volume

31

pub_type

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