Abstract
There is a high frequency of tumor recurrence in non-muscle invasive bladder cancer (NMIBC) after transurethral resection and postoperative intravesical chemotherapy, however, the molecular mechanisms leading to the chemoresistance and tumor re-growth remain largely unknown. In this study, we observed a significant decrease of DAB2IP expression in high-grade and recurrent NMIBC specimens, which was negatively correlated with Twist1 expression and predicted a lower recurrence-free survival of patients. Mechanistically, DAB2IP could inhibit the phosphorylation and transactivation of STAT3, and then subsequently suppress the expression of Twist1 and its target gene P-glycoprotein, both of which were crucial for the pirarubicin chemoresistance and tumor re-growth of bladder cancer cells. Overall, this study reveals a new promising biomarker modulating the chemoresistance and tumor recurrence of NMIBC after bladder preservation surgery.
Keywords:
Bladder cancer; DAB2IP; P-glycoprotein; Pirarubicin; Tumor recurrence; Twist1.
Copyright © 2015 Elsevier Inc. All rights reserved.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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ATP Binding Cassette Transporter, Subfamily B, Member 1 / metabolism
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Animals
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Antineoplastic Agents / pharmacology*
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Antineoplastic Agents / therapeutic use
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Cell Line, Tumor
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Cell Survival / drug effects
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Down-Regulation
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Doxorubicin / analogs & derivatives*
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Doxorubicin / pharmacology
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Doxorubicin / therapeutic use
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Drug Resistance, Neoplasm
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Female
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Humans
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Kaplan-Meier Estimate
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Mice, Inbred BALB C
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Mice, Nude
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Neoplasm Invasiveness
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Neoplasm Recurrence, Local / metabolism*
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Neoplasm Recurrence, Local / mortality
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Neoplasm Recurrence, Local / prevention & control
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Nuclear Proteins / metabolism
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STAT3 Transcription Factor / metabolism
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Signal Transduction
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Twist-Related Protein 1 / metabolism
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Urinary Bladder Neoplasms / drug therapy
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Urinary Bladder Neoplasms / epidemiology*
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Urinary Bladder Neoplasms / metabolism*
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Urinary Bladder Neoplasms / mortality
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Urinary Bladder Neoplasms / pathology
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Urothelium / metabolism
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Urothelium / pathology
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Xenograft Model Antitumor Assays
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ras GTPase-Activating Proteins / physiology*
Substances
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ATP Binding Cassette Transporter, Subfamily B, Member 1
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Antineoplastic Agents
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DAB2IP protein, human
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Nuclear Proteins
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STAT3 Transcription Factor
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STAT3 protein, human
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TWIST1 protein, human
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Twist-Related Protein 1
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ras GTPase-Activating Proteins
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Doxorubicin
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pirarubicin