Establishment of Gemcitabine-resistant Mouse Pancreatic Ductal Adenocarcinoma Cell Line and Possible Therapeutic Agents.

[BACKGROUND/AIM] Pancreatic ductal adenocarcinoma (PDAC) remains highly lethal due to gemcitabine (GEM) resistance. This study aimed to establish a clinically relevant immunocompetent model to identify novel mediators of acquired GEM resistance.

[MATERIALS AND METHODS] Metastatic PDAC (mPDAC) cells, generated from CD133-positive pancreatic stem cells (mutant ), were subjected to chronic GEM selection to establish a line with reduced sensitivity (mPDAC-R).

[RESULTS] mPDAC-R exhibited sustained growth under GEM treatment, alongside enhanced invasiveness and metastatic potential. Transcriptomic profiling identified monoamine oxidase B (MAOB) as an up-regulated mediator. Pharmacological inhibition of MAOB significantly suppressed proliferation and tumor growth in both mPDAC-R and human PDAC cell lines.

[CONCLUSION] We established a novel GEM-resistant mPDAC model and identified MAOB as a promising therapeutic target. These findings provide a rationale for targeting MAOB-driven survival signals to overcome chemoresistance in refractory pancreatic cancer.