| Literature DB >> 31484670 |
Simona Dalin1,2, Mark R Sullivan1,2, Allison N Lau1,2, Beatrice Grauman-Boss1,2, Helen S Mueller1,2, Emanuel Kreidl1,2, Silvia Fenoglio1,2, Alba Luengo1,2, Jacqueline A Lees1,2, Matthew G Vander Heiden1,2,3, Douglas A Lauffenburger4,5, Michael T Hemann4,2.
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is a leading cause of cancer deaths in the United States. The deoxynucleoside analogue gemcitabine is among the most effective therapies to treat PDAC, however, nearly all patients treated with gemcitabine either fail to respond or rapidly develop resistance. One hallmark of PDAC is a striking accumulation of stromal tissue surrounding the tumor, and this accumulation of stroma can contribute to therapy resistance. To better understand how stroma limits response to therapy, we investigated cell-extrinsic mechanisms of resistance to gemcitabine. Conditioned media from pancreatic stellate cells (PSC), as well as from other fibroblasts, protected PDAC cells from gemcitabine toxicity. The protective effect of PSC-conditioned media was mediated by secretion of deoxycytidine, but not other deoxynucleosides, through equilibrative nucleoside transporters. Deoxycytidine inhibited the processing of gemcitabine in PDAC cells, thus reducing the effect of gemcitabine and other nucleoside analogues on cancer cells. These results suggest that reducing deoxycytidine production in PSCs may increase the efficacy of nucleoside analog therapies. SIGNIFICANCE: This study provides important new insight into mechanisms that contribute to gemcitabine resistance in PDAC and suggests new avenues for improving gemcitabine efficacy. ©2019 American Association for Cancer Research.Entities:
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Year: 2019 PMID： 31484670 PMCID： PMC7357734 DOI： 10.1158/0008-5472.CAN-19-0960
Source DB: PubMed Journal: Cancer Res ISSN： 0008-5472 Impact factor: 12.701