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.
SASP mediates chemoresistance and tumor-initiating-activity of mesothelioma cells / C. Canino, F. Mori, A. Cambria, A. Diamantini, S. Germoni, G. Alessandrini, G. Borsellino, R.Z. Galati, L. Battistini, R. Blandino, F. Facciolo, G. Citro, S. Strano, P. Muti, G. Blandino, M. Cioce. - In: ONCOGENE. - ISSN 0950-9232. - 31:26(2012), pp. 3148-3163.
SASP mediates chemoresistance and tumor-initiating-activity of mesothelioma cells
P. Muti;
2012
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.File | Dimensione | Formato | |
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