All-trans retinoic acid induces durable tumor immunity in IDH-mutant gliomas by rescuing transcriptional repression of the CRBP1-retinoic acid axis
Rao, A.; Zhang, X.; Cillo, A.; Sussman, J. H.; Sandlesh, P.; Tarbay, A. C.; Mallela, A. N.; Cardello, C.; Krueger, K.; Xu, J.; Li, A.; Xu, J.; Patterson, J.; Akca, E.; Angione, A.; Jaman, E.; Kim, W. J.; Allen, J.; Venketeswaran, A.; Zinn, P. O.; Parise, R.; Beumer, J.; Duensing, A.; Holland, E. C.; Ferris, R.; Bagley, S. J.; Bruno, T. C.; Vignali, D. A. A.; Agnihotri, S.; Amankulor, N. M.
Show abstract
Diffuse gliomas are epigenetically dysregulated, immunologically cold, and fatal tumors characterized by mutations in isocitrate dehydrogenase (IDH). Although IDH mutations yield a uniquely immunosuppressive tumor microenvironment, the regulatory mechanisms that drive the immune landscape of IDH mutant (IDHm) gliomas remain unknown. Here, we reveal that transcriptional repression of retinoic acid (RA) pathway signaling impairs both innate and adaptive immune surveillance in IDHm glioma through epigenetic silencing of retinol binding protein 1 (RBP1) and induces a profound anti-inflammatory landscape marked by loss of inflammatory cell states and infiltration of suppressive myeloid phenotypes. Restorative retinoic acid therapy in murine glioma models promotes clonal CD4+ T cell expansion and induces tumor regression in IDHm, but not IDH wildtype (IDHwt), gliomas. Our findings provide a mechanistic rationale for RA immunotherapy in IDHm glioma and is the basis for an ongoing investigator-initiated, single-center clinical trial investigating all-trans retinoic acid (ATRA) in recurrent IDHm human subjects.
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