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Kopecka J, Salaroglio IC, Righi L, Libener R, Orecchia S, Grosso F, Milosevic V, Ananthanarayanan P, Ricci L, Capelletto E, Pradotto M, Napoli F, Di Maio M, Novello S, Rubinstein M, Scagliotti GV, Riganti C. Loss of C/EBP-β LIP drives cisplatin resistance in malignant pleural mesothelioma. Lung Cancer 2018; 120:34-45. [PMID: 29748013 DOI: 10.1016/j.lungcan.2018.03.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 03/13/2018] [Accepted: 03/22/2018] [Indexed: 12/22/2022]
Abstract
OBJECTIVES Cisplatin-based chemotherapy is moderately active in malignant pleural mesothelioma (MPM) due to intrinsic drug resistance and to low immunogenicity of MPM cells. CAAT/enhancer binding protein (C/EBP)-β LIP is a pro-apoptotic and chemosensitizing transcription factor activated in response to endoplasmic reticulum (ER) stress. MATERIALS AND METHODS We investigated if LIP levels can predict the clinical response to cisplatin and survival of MPM patients receiving cisplatin-based chemotherapy. We studied the LIP-dependent mechanisms determining cisplatin-resistance and we identified pharmacological approaches targeting LIP, able to restore cisplatin sensitiveness, in patient-derived MPM cells and animal models. Results were analyzed by a one-way analysis of variance test. RESULTS We found that LIP was degraded by constitutive ubiquitination in primary MPM cells derived from patients poorly responsive to cisplatin. LIP ubiquitination was directly correlated with cisplatin chemosensitivity and was associated with patients' survival after chemotherapy. Overexpression of LIP restored cisplatin's pro-apoptotic effect by activating CHOP/TRB3/caspase 3 axis and up-regulating calreticulin, that triggered MPM cell phagocytosis by dendritic cells and expanded autologous anti-tumor CD8+CD107+T-cytotoxic lymphocytes. Proteasome inhibitor carfilzomib and lysosome inhibitor chloroquine prevented LIP degradation. The triple combination of carfilzomib, chloroquine and cisplatin increased ER stress-triggered apoptosis and immunogenic cell death in patients' samples, and reduced tumor growth in cisplatin-resistant MPM preclinical models. CONCLUSION The loss of LIP mediates cisplatin resistance, rendering LIP a possible predictor of cisplatin response in MPM patients. The association of proteasome and lysosome inhibitors reverses cisplatin resistance by restoring LIP levels and may represent a new adjuvant strategy in MPM treatment.
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Affiliation(s)
- Joanna Kopecka
- Department of Oncology, University of Torino, via Santena 5/bis, 10126, Torino, Italy.
| | - Iris C Salaroglio
- Department of Oncology, University of Torino, via Santena 5/bis, 10126, Torino, Italy.
| | - Luisella Righi
- Pathology Unit, Department of Oncology at San Luigi Hospital, University of Torino, Regione Gonzole 10, 10043, Orbassano, Italy.
| | - Roberta Libener
- Pathology Division, S. Antonio and Biagio Hospital, Spalto Marengo, 15121, Alessandria, Italy.
| | - Sara Orecchia
- Pathology Division, S. Antonio and Biagio Hospital, Spalto Marengo, 15121, Alessandria, Italy.
| | - Federica Grosso
- Oncology Division, S. Antonio and Biagio Hospital, Spalto Marengo, 15121, Alessandria, Italy.
| | - Vladan Milosevic
- Department of Oncology, University of Torino, via Santena 5/bis, 10126, Torino, Italy.
| | | | - Luisa Ricci
- Department of Oncology, University of Torino, via Santena 5/bis, 10126, Torino, Italy.
| | - Enrica Capelletto
- Thoracic Unit and Medical Oncology Division, Department of Oncology at San Luigi Hospital, Regione Gonzole 10, University of Torino, Orbassano, Italy.
| | - Monica Pradotto
- Thoracic Unit and Medical Oncology Division, Department of Oncology at San Luigi Hospital, Regione Gonzole 10, University of Torino, Orbassano, Italy.
| | - Francesca Napoli
- Pathology Unit, Department of Oncology at San Luigi Hospital, University of Torino, Regione Gonzole 10, 10043, Orbassano, Italy.
| | - Massimo Di Maio
- Medical Oncology Division, Department of Oncology at Mauriziano Hospital, Largo Filippo Turati 62, 10128, University of Torino, Italy.
| | - Silvia Novello
- Thoracic Unit and Medical Oncology Division, Department of Oncology at San Luigi Hospital, Regione Gonzole 10, University of Torino, Orbassano, Italy.
| | - Menachem Rubinstein
- Department of Molecular Genetics, The Weizmann Institute of Science, Herzl Street 234, 76100, Rehovot, Israel.
| | - Giorgio V Scagliotti
- Thoracic Unit and Medical Oncology Division, Department of Oncology at San Luigi Hospital, Regione Gonzole 10, University of Torino, Orbassano, Italy.
| | - Chiara Riganti
- Department of Oncology, University of Torino, via Santena 5/bis, 10126, Torino, Italy.
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