NFAT mediates pro-tumorigenic inflammation in cancer-associated fibroblasts in pancreatic ductal adenocarcinoma.

Pancreatic ductal adenocarcinoma (PDAC) is characterized by a dense stroma, low immunogenicity, and resistance to therapy. Cancer-associated fibroblasts (CAFs) are key stromal cells within the tumor microenvironment (TME) that drive tumor progression. Interleukin-1 (IL-1) promotes fibrosis, pathogenic inflammation, and poor prognosis in PDAC. Using a single-cell multi-omic approach, we investigate the IL-1 signaling axis in human and mouse models of PDAC, identifying nuclear factor of activated T cells (NFAT) transcription factors as key mediators. IL1R1+ CAFs activate an inflammatory phenotype associated with elevated NFAT motif activity and gene expression. In vivo, NFAT inhibition in a mouse model of PDAC significantly reduces tumor weight and fibrosis, supporting its pro-tumorigenic role. Our findings suggest that NFAT mediates IL-1-induced inflammation in PDAC, highlighting its potential as a therapeutic target. This study demonstrates the power of multi-omic analyses to uncover therapeutic targets within the complex TME.