Abstract A056: Epithelial hyaluronan synthase 2 expression promotes pancreas cancer metastasis

Abstract

Abstract A defining characteristic of pancreatic ductal adenocarcinoma (PDA) is its robust desmoplastic reaction that promotes tumor progression and protects PDA from treatment. As a major component of the extreme microenvironment, hyaluronan (HA) is synthesized by the hyaluronan synthase (Has) family of enzymes and secreted in excess by both epithelial cells and cancer-associated fibroblasts (CAFs). We have previously described the role of HA in binding water and swelling to create vessel-crushing interstitial gel-fluid pressures and its function as a biophysical barrier. However, HA also acts by signaling through a wide range of specific receptors that can drive proliferation, migration and invasion. In an effort to understand the role of HA in PDA development and pathogenesis, we developed a KPC mouse model of autochthonous pancreas cancer in which Has2 is conditionally deleted in tumor epithelial cells (TECs). We demonstrate that Has2-deficient epithelial cells produce little to no HA and altered the dense microenvironment. We also found that deletion of Has2 leads to an increase in overall survival and a striking reduction in metastasis. We have further investigated the cell autonomous functions of Has2, associated with 3D invasion and activation of oncogenic signaling pathways in TECs. These data implicate a potential Achilles’ heel in PDA, whereby HAS2 is required to maintain a highly metastatic phenotype involving both non-cell and cell autonomous mechanisms. Citation Format: Bo Tu, Heather Wright T. Wright, Christopher C. Dufort, Martin C. Whittle, Libing Feng, Shelley M. Thorsen, Sunil R. Hingorani. Epithelial hyaluronan synthase 2 expression promotes pancreas cancer metastasis [abstract]. In: Proceedings of the AACR Special Conference on Pancreatic Cancer; 2022 Sep 13-16; Boston, MA. Philadelphia (PA): AACR; Cancer Res 2022;82(22 Suppl):Abstract nr A056.