Melanoma dedifferentiation induced by IFN-γ epigenetic remodeling in response to anti-PD-1 therapy
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Yeon Joo Kim Katherine M Sheu Jennifer Tsoi Gabriel Abril-Rodriguez Egmidio Medina Catherine S Grasso Davis Y Torrejon Ameya S Champhekar Kevin Litchfield Charles Swanton Daniel E Speiser Philip O Scumpia Alexander Hoffmann Thomas G Graeber Cristina Puig-Saus Antoni RibasAbstract
Melanoma dedifferentiation has been reported as a state of cellular resistance to targeted therapies and immunotherapies as cancer cells revert to a more primitive cellular phenotype. Here we show that, counterintuitively, the biopsies of patient tumors that respond to anti-programmed cell death receptor 1 (PD-1) therapy decreased expression of melanocytic markers and increased neural crest markers, suggesting treatment-induced dedifferentiation. When modeling the effects in vitro, we documented that melanoma cell lines that were originally melanocytic differentiated underwent a process of neural crest dedifferentiation when continuously exposed to interferon gamma, through global chromatin landscape changes leading to enrichment in specific hyperaccessible chromatin regions. The interferon gamma-induced dedifferentiation signature corresponded with improved outcomes in patients with melanoma, challenging the notion that neural crest dedifferentiation is entirely an adverse phenotype.
Journal details
Volume 131
Issue number 12
Pages e145859
Available online
Publication date
Full text links
Publisher website (DOI) 10.1172/JCI145859
Europe PubMed Central 33914706
Pubmed 33914706