Ramos-Delgado, F.; Shalhoub, H.; Guyon, C.; Handschin, C.; Cerapio-Arroyo, P.; DAngelo, R.; Therville, N.; Villard, A.; Cayron, C.; Valle, C.; Sarot, E.; Dussere, N.; Di-Luoffo, M.; Rebours, V.; Couvelard, A.; Joffre, C.; de Oliveira, H.; Dufresne, M.; Thibault, B.; Guillermet-Guibert, J.

Differentiated cell plasticity and autophagy are fundamental mechanisms of tissue repair. To investigate their integration to maintain tissue homeostasis, we developed a unique model in which VPS34, the highly conserved class III PI3K that promotes autophagic flux, was inactivated in pancreatic exocrine cells, recognised study models. Using scRNAseq, we found that VPS34-null acinar cells evolved towards a transcriptional identity present at low levels in mouse and human pancreas. Functionally, it unexpectedly prevented transdifferentiation, chronic pancreatitis and precancer initiation triggered by stressors. Mechanistically, the newly differentiated cell state was less susceptible to cancer promotion by oncogenic KRAS, through reduced class I PI3K and increased lysosomal degradation of pro-inflammatory REG3A. This result opens the so far unreachable possibility of strategies for protection from environmentally induced cancer initiation.