Heterogeneous RNA editing and influence of ADAR2 on mesothelioma chemoresistance and the tumor microenvironment.

Abstract

We previously observed increased levels of adenosine-deaminase-acting-on-dsRNA (Adar)-dependent RNA editing during mesothelioma development in mice exposed to asbestos. The aim of this study was to characterize and assess the role of ADAR-dependent RNA editing in mesothelioma. We found that tumors and mesothelioma primary cultures have higher ADAR-mediated RNA editing compared to mesothelial cells. Unsupervised clustering of editing in different genomic regions revealed heterogeneity between tumor samples as well as mesothelioma primary cultures. ADAR2 expression levels are higher in BRCA1-associated protein 1 wild-type tumors, with corresponding changes in RNA editing in transcripts and 3'UTR. ADAR2 knockdown and rescue models indicated a role in cell proliferation, altered cell cycle, increased sensitivity to antifolate treatment, and type-1 interferon signaling upregulation, leading to changes in the microenvironment in vivo. Our data indicate that RNA editing contributes to mesothelioma heterogeneity and highlights an important role of ADAR2 not only in growth regulation in mesothelioma but also in chemotherapy response, in addition to regulating inflammatory response downstream of sensing nucleic acid structures.

• Authors: Ananya Hariharan, Weihong Qi, Hubert Rehrauer, Licun Wu, Manuel Ronner, Martin Wipplinger, Jelena Kresoja-Rakic, Suna Sun, Lucia Oton-Gonzalez, Marika Sculco, Véronique Serre-Beinier, Clément Meiller, Christophe Blanquart, Jean-François Fonteneau, Bart Vrugt, Jan Hendrik Rüschoff, Isabelle Opitz, Didier Jean, Marc de Perrot, Emanuela Felley-Bosco
• Journal: Molecular oncology (Mol Oncol) Vol. 16 Issue 22 Pg. 3949-3974 (12 2022) ISSN: 1878-0261 [Electronic] United States
• PMID: 36221913 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2022 The Authors. Molecular Oncology published by John Wiley & Sons Ltd on behalf of Federation of European Biochemical Societies.

Chemical References

• RNA-Binding Proteins
• Adenosine Deaminase
• ADAR2 protein, mouse

Topics

• Animals
• Mice
• RNA Editing (genetics)
• Tumor Microenvironment (genetics)
• Drug Resistance, Neoplasm (genetics)
• RNA-Binding Proteins (genetics, metabolism)
• Adenosine Deaminase (genetics, metabolism)
• Mesothelioma, Malignant
• Mesothelioma (genetics)