PIM kinases mediate resistance of glioblastoma cells to TRAIL by a p62/SQSTM1-dependent
| Autor: | Serrano-Sáenz, Santiago, Palacios, Carmen, Delgado-Bellido, Daniel, López-Jiménez, L., García-Díaz, Ángel, Soto-Serrano, Yolanda, Casal, J. Ignacio, Bartolomé, Rubén Álvaro, Fernández-Luna, J. L., López-Rivas, Abelardo, Oliver, Francisco Javier |
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| Přispěvatelé: | Ministerio de Economía y Competitividad (España), Junta de Andalucía, Instituto de Salud Carlos III, Red Temática de Investigación Cooperativa en Cáncer (España), European Commission, Casal, J. Ignacio [0000-0003-1085-2840], Oliver, Francisco Javier [0000-0002-8073-4711], Casal, J. Ignacio, Oliver, Francisco Javier |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Glioblastoma (GBM) is the most common and aggressive brain tumor and is associated with poor prognosis. GBM cells are frequently resistant to tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) and finding new combinatorial therapies to sensitize glioma cells to TRAIL remains an important challenge. PIM kinases are serine/threonine kinases that promote cell survival and proliferation and are highly expressed in different tumors. In this work, we studied the role of PIM kinases as regulators of TRAIL sensitivity in GBM cells. Remarkably, PIM inhibition or knockdown facilitated activation by TRAIL of a TRAIL-R2/DR5-mediated and mitochondria-operated apoptotic pathway in TRAIL-resistant GBM cells. The sensitizing effect of PIM knockdown on TRAIL-induced apoptosis was mediated by enhanced caspase-8 recruitment to and activation at the death-inducing signaling complex (DISC). Interestingly, TRAIL-induced internalization of TRAIL-R2/DR5 was significantly reduced in PIM knockdown cells. Phospho-proteome profiling revealed a decreased phosphorylation of p62/SQSTM1 after PIM knockdown. Our results also showed an interaction between p62/SQSTM1 and the DISC that was reverted after PIM knockdown. In line with this, p62/SQSTM1 ablation increased TRAIL-R2/DR5 levels and facilitated TRAIL-induced caspase-8 activation, revealing an inhibitory role of p62/SQSTM1 in TRAIL-mediated apoptosis in GBM. Conversely, upregulation of TRAIL-R2/DR5 upon PIM inhibition and apoptosis induced by the combination of PIM inhibitor and TRAIL were abrogated by a constitutively phosphorylated p62/SQSTM1(S332E) mutant. Globally, our data represent the first evidence that PIM kinases regulate TRAIL-induced apoptosis in GBM and identify a specific role of p62/SQSTM1( Ser332) phosphorylation in the regulation of the extrinsic apoptosis pathway activated by TRAIL. This work was supported by grants from Ministerio de Economia y Competitividad (SAF2015-64383-P to ALR and SAF2012-40011-C02-01, SAF2015-70520-R to FJO), Junta de Andalucia Excellence Program (BIO 778 to ALR and P10-CTS-0662, P12-CTS-383 to FJO), CIBERONC ISCIII (CB16/12/00421 to FJO), Red Tematica de Investigacion Cooperativa en Cancer (RD12/0036/0026 to ALR) and the European Community through the regional development funding program (FEDER). We thank F.J. Fernandez-Farran for excellent technical assistance. |
| Databáze: | OpenAIRE |
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