Abstract 6230: Tumor nuclear uPA: A transcriptional modulator of perineural invasion in PDAC

Abstract Perineural invasion is highly prevalent in pancreatic ductal adenocarcinoma and correlates with poor outcomes; clinical approaches to inhibit PNI remain limited. Using integrated transcriptomic analyses of PDAC parenchymal cells with escalating nerve-invasive potential, we identified PLAU (uPA) as a key determinant of PNI capacity. Patient single-cell datasets showed that high tumor PLAU expression is associated with enrichment of Schwann cells in the tumor microenvironment and strengthened ductal cell-Schwann cell communication. Functionally, nuclear uPA in PDAC parenchymal cells activates Schwann cells in a coculture perineural invasion model. Mechanistically, chromatin profiling revealed that nuclear uPA occupies a compact set of genomic sites enriched near transcription start sites and linked to genes governing neural development and neuronal signaling. Motif analysis, biolayer interferometry (BLI), and co-immunoprecipitation showed that uPA binds c-Jun; the uPA-c-Jun complex engages DNA and serves as a co-regulator that drives pro-neurogenic transcriptional programs. Together, these findings establish nuclear uPA as a central mediator of tumor-nerve crosstalk in PDAC and highlight targeting its nuclear function as a promising strategy to inhibit perineural invasion. Citation Format: Yun HE, Zonghua Su, Feng Ding, Zheng Chen, Xinxing Cui, Liu Yang, Shuangying Qiao, Yaru Hou, Aiping Lu, Fangfei Li. Tumor nuclear uPA: A transcriptional modulator of perineural invasion in PDAC [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2026; Part 1 (Regular Abstracts); 2026 Apr 17-22; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2026;86(7 Suppl):Abstract nr 6230.