American Association for Cancer Research
Browse
00085472can190960-sup-219418_2_supp_5737654_pwwl3j.docx (13.68 kB)

Supplementary Figure Legends from Deoxycytidine Release from Pancreatic Stellate Cells Promotes Gemcitabine Resistance

Download (13.68 kB)
journal contribution
posted on 2023-03-31, 02:47 authored by Simona Dalin, Mark R. Sullivan, Allison N. Lau, Beatrice Grauman-Boss, Helen S. Mueller, Emanuel Kreidl, Silvia Fenoglio, Alba Luengo, Jacqueline A. Lees, Matthew G. Vander Heiden, Douglas A. Lauffenburger, Michael T. Hemann

Supplementary Figure Legends

Funding

NIH

NCI

Damon Runyon Cancer Research Foundation

MIT Center for Precision Cancer Medicine and the Ludwig Center at MIT

History

ARTICLE 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. This study provides important new insight into mechanisms that contribute to gemcitabine resistance in PDAC and suggests new avenues for improving gemcitabine efficacy.

Usage metrics

    Cancer Research

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC