Apoptotic Cell-Derived Extracellular Vesicles Promote Malignancy of Glioblastoma Via Intercellular Transfer of Splicing Factors

Publication date: Available online 21 June 2018
Source:Cancer Cell
Author(s): Marat S. Pavlyukov, Hai Yu, Soniya Bastola, Mutsuko Minata, Victoria O. Shender, Yeri Lee, Suojun Zhang, Jia Wang, Svetlana Komarova, Jun Wang, Shinobu Yamaguchi, Heba Allah Alsheikh, Junfeng Shi, Dongquan Chen, Ahmed Mohyeldin, Sung-Hak Kim, Yong Jae Shin, Ksenia Anufrieva, Evgeniy G. Evtushenko, Nadezhda V. Antipova, Georgij P. Arapidi, Vadim Govorun, Nikolay B. Pestov, Mikhail I. Shakhparonov, L. James Lee, Do-Hyun Nam, Ichiro Nakano
Aggressive cancers such as glioblastoma (GBM) contain intermingled apoptotic cells adjacent to proliferating tumor cells. Nonetheless, intercellular signaling between apoptotic and surviving cancer cells remain elusive. In this study, we demonstrate that apoptotic GBM cells paradoxically promote proliferation and therapy resistance of surviving tumor cells by secreting apoptotic extracellular vesicles (apoEVs) enriched with various components of spliceosomes. apoEVs alter RNA splicing in recipient cells, thereby promoting their therapy resistance and aggressive migratory phenotype. Mechanistically, we identified RBM11 as a representative splicing factor that is upregulated in tumors after therapy and shed in extracellular vesicles upon induction of apoptosis. Once internalized in recipient cells, exogenous RBM11 switches splicing of MDM4 and Cyclin D1 toward the expression of more oncogenic isoforms.

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Teaser

Pavlyukov et al. show that apoptotic GBM cells secrete vesicles enriched with components of spliceosomes to alter RNA splicing in surviving tumor cells and promote their aggressiveness. They identify RBM11 as one such factor that switches MDM4 and cyclinD1 toward the more oncogenic isoforms in recipient cells.


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