Cancer Chemotherapy and Pharmacology

, Volume 59, Issue 4, pp 495–505

Glucose uptake inhibitor sensitizes cancer cells to daunorubicin and overcomes drug resistance in hypoxia

  • Xianhua Cao
  • Lanyan Fang
  • Seth Gibbs
  • Ying Huang
  • Zunyan Dai
  • Ping Wen
  • Xincheng Zheng
  • Wolfgang Sadee
  • Duxin Sun
Original Article

DOI: 10.1007/s00280-006-0291-9

Cite this article as:
Cao, X., Fang, L., Gibbs, S. et al. Cancer Chemother Pharmacol (2007) 59: 495. doi:10.1007/s00280-006-0291-9

Abstract

Purpose

A high-rate glycolysis is a fundamental property of solid tumors and is associated with an over-expression of glucose transporters and glycolytic enzymes. We hypothesize that over-expression of glucose transporters in tumors prevents apoptosis, promotes cancer cell survival, and confers drug resistance. Inhibition of glucose transporter will preferentially sensitize the anticancer effects of chemotherapeutic drugs to overcome drug resistance in hypoxia.

Methods

Glucose transporter expressions were detected in cancer tissues and NCI 60 cancer cells with immunostaining and DNA microarray. Glucose uptake was measured with 3H-2-deoxy-glucose. Cytotoxicity of daunorubicin (DNR) in combination of glucose inhibitor was detected by MTS assay under hypoxic condition. Early stage apoptosis was monitored with Annexin V-FITC staining.

Results

Immunostaining showed that GLUT1 was significantly increased in hypoxic regions of the human colon and breast tumors. The expression profiles of all glucose transporters in NCI 60 cancer cells exhibited distinct expression patterns. Phloretin exhibited more than 60% glucose uptake inhibition. Hypoxia conferred two to fivefold higher drug resistance in SW620 and K562 to DNR. Inhibition of glucose uptake by phloretin sensitized cancer cells to DNR for its anticancer activity and apoptosis to overcome drug resistance only under hypoxia.

Conclusion

Cancer cells heavily rely on glucose transporters for glucose uptake to facilitate a high-rate glycolysis under hypoxia for their survival and drug resistance. Combination of glucose transporter inhibitors and chemotherapeutic drugs may provide a preferential novel therapeutic strategy to overcome drug resistance in hypoxia.

Keywords

Glucose transporter Glycolysis inhibitor Combination Drug resistance Hypoxia 

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Xianhua Cao
    • 1
  • Lanyan Fang
    • 1
  • Seth Gibbs
    • 1
  • Ying Huang
    • 2
  • Zunyan Dai
    • 2
  • Ping Wen
    • 3
  • Xincheng Zheng
    • 3
  • Wolfgang Sadee
    • 2
  • Duxin Sun
    • 1
  1. 1.Division of Pharmaceutics, School of PharmacyThe Ohio State UniversityColumbusUSA
  2. 2.Department of PharmacologyThe Ohio State UniversityColumbusUSA
  3. 3.Department of PathologyThe Ohio State UniversityColumbusUSA

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