Gemcitabine-based
chemotherapy is the first-line treatment for
pancreatic cancer. However, chemoresistance is a major obstacle to drug efficacy, leading to poor prognosis. Little progress has been achieved although multiple mechanisms are investigated. Therefore, effective strategies are urgently needed to overcome drug resistance. Here, we demonstrate that the
transcription factor GATA binding protein 1 (GATA1) promotes
gemcitabine resistance in
pancreatic cancer through antiapoptotic pathway. GATA1 is highly expressed in pancreatic ductal
adenocarcinoma (PDAC) tissues, and GATA1 status is an independent predictor of prognosis and response to
gemcitabine therapy. Further investigation demonstrates GATA1 is involved in both intrinsic and acquired
gemcitabine resistance in PDAC cells. Mechanistically, we find that GATA1 upregulates Bcl-XL expression by binding to its promoter and thus induces
gemcitabine resistance through enhancing Bcl-XL mediated antiapoptosis in vitro and in vivo. Moreover, in PDAC patients, Bcl-XL expression is positively correlated with GATA1 level and predicts clinical outcomes and
gemcitabine response. Taken together, our results indicate that GATA1 is a novel marker and potential target for
pancreatic cancer. Targeting GATA1 combined with Bcl-XL may be a promising strategy to enhance
gemcitabine response.