A Novel Cell Stress Response Mechanism in Pancreatic Cancer

Abstract public domain (NIH RePORTER)

Pancreatic ductal adenocarcinoma (PDAC) is notoriously treatment resistant. Immunotherapy has revolutionized the treatment of many cancer types, yet its success in PDAC remains profoundly limited. PDAC exists within an unusually hostile tumor microenvironment featured by severe nutrient deprivation, hypoxia, oxidative stress, and intense metabolic demands, all of which foster cancer progression and immune evasion. Emerging evidence indicates that intrinsic characteristics of cancer cells actively shape this harsh tumor microenvironment to suppress immune surveillance and promote tumor persistence. These stress-driven adaptations not only sustain tumor aggressiveness but also expose actionable vulnerabilities for therapeutic intervention. In this study, we leverage an innovative large-scale discovery platform to systematically identify immunotherapeutic targets by interrogating the intricate interplay between tumor cells and the immune system within the unique PDAC microenvironment. Through this approach, we have identified critical targets that enable PDAC cells to adapt to stress, resist cell death, and escape immune surveillance. This application focuses on a previously unrecognized stress-response regulator that is integral to both cancer cell survival and immune resistance and therefore represents a promising candidate for new therapy development. Although little is known about this target in human cancers, our research aims to uncover its role and mechanisms in modulating stress responses and immune evasion, thereby providing foundational insights into its therapeutic potential. The major objectives of this study are: i) to elucidate the novel molecular pathways that enable PDAC cells to adapt to adverse conditions and evade immune surveillance; ii) to determine how these pathways contribute to tumor survival and immune suppression; and iii) to evaluate the potential of targeting these pathways as a therapeutic strategy. By addressing these knowledge gaps, our work will substantially advance our understanding of how pancreatic cancer cells survive in a hostile microenvironment and escape immune detection, providing critical insights into the mechanisms underlying PDAC resistance to conventional therapies and immunotherapy. The proposed research represents an essential step toward our long-term goal of developing transformative therapeutic strategies against this newly defined stress-response regulator and may ultimately inform new treatment approaches for other cancers that are refractory to immune-based therapies, with the overarching aim of improving outcomes for patients with this devastating disease. Animal models are essential for this project because the dynamic interactions among pancreatic cancer cells, stromal components, and the immune system occur within a complex in vivo environment that cannot be faithfully reproduced in vitro. Syngeneic allograft models and a novel genetically engineered mouse model of PDAC will allow us to investigate tumor development, immune evasion, and therapeutic responses in immunocompetent hosts, providing critical biological insights that are not achievable using cell culture or other non-animal approaches.

Public health relevance public domain (NIH RePORTER)

NARRATIVE Current treatments, including immunotherapy, remain largely ineffective for pancreatic cancer. This project will define the molecular mechanisms that drive therapeutic resistance by linking how cancer cells adapt to stress with how they evade the immune system. Understanding and targeting these pathways will enable the development of new therapeutic strategies with the potential to improve outcomes for patients with pancreatic cancer and other hard-to-treat cancers.