Myofibroblasts Induce Neuroplasticity to Promote Pancreatic Inflammation and Cancer Progression

Pancreatic ductal adenocarcinoma (PDAC) co-opts the peripheral nervous system through nerve hypertrophy, axonogenesis and perineural invasion, and these processes correlate with patient morbidity and mortality. Prior work has shown that autonomic nerves directly modulate neoplastic cells in PDAC, but whether cancer-associated fibroblasts (CAFs) participate in neural remodeling is unknown. Using thick tissue sections, we identified dense neo-innervation near myofibroblastic CAFs (myCAFs) in preinvasive Pancreatic Intraepithelial Neoplasms (PanINs). Mechanistically, TGF-β produced during inflammation and neoplasia triggers myofibroblast formation, and myCAFs produce axon guidance molecules that recruit sympathetic nerves. Norepinephrine released by sympathetic nerves activates myofibroblast cultures in vitro, and sympathetic nerve depletion impairs stromal activation and PDAC growth in vivo. A chemogenetic model confirmed that fibroblast-specific α1-adrenergic signaling exacerbated pancreatic inflammation and neoplasia. Therefore, beyond direct epithelial effects, sympathetic nerves promote pancreatitis and PDAC by co-opting myofibroblasts and myCAFs as disease amplifiers, highlighting CAF subtype-specific stromal interactions as putative therapeutic targets.