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Pancreatic cancer develops dense stromal tissue through the desmoplastic reaction. The aim of the present study was to assess the effects of a fibroblast-rich environment on the malignant potential of pancreatic cancer. Cells from the human pancreatic cancer cell line BxPC-3 were mixed at a ratio of 1:3 (fibroblast-rich) or 1:1 (fibroblast-poor) with cells from the human skin fibroblast line ASF-4-1. In the fibroblast-rich co-culture, tumor budding was observed and BxPC-3 cells were found to be more resistant to gemcitabine than those in the fibroblast-poor co-culture. Immunohistochemistry revealed that the expression of mammalian target of rapamycin was increased at the invasive front of fibroblast-rich co-cultures. In addition, in mouse xenografts of fibroblast-rich co-cultures, tumors were larger and had a higher Ki-67 index compared with that of the fibroblast-poor co-culture xenografts. These results indicate that fibroblast-rich co-cultures may promote the malignant potential of the pancreatic cancer cell line BxPC-3, both in vitro and in vivo .

oncology letters

ASF-4-1 fibroblast-rich culture increases chemoresistance and mTOR expression of pancreatic cancer BxPC-3 cells at the invasive front in vitro, and promotes tumor growth and invasion in vivo