These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Imatinib (STI571)-mediated changes in glucose metabolism in human leukemia BCR-ABL-positive cells.
    Author: Gottschalk S, Anderson N, Hainz C, Eckhardt SG, Serkova NJ.
    Journal: Clin Cancer Res; 2004 Oct 01; 10(19):6661-8. PubMed ID: 15475456.
    Abstract:
    The therapeutic efficacy of imatinib mesylate (Gleevec) is based on its specific inhibition of the BCR-ABL oncogene protein, a widely expressed tyrosine kinase in chronic myelogenous leukemia (CML) cells. The goal of this study was to evaluate glucose metabolism in BCR-ABL-positive cells that are sensitive to imatinib exposure. Two human BCR-ABL-positive cell lines (CML-T1 and K562) and one BCR-ABL-negative cell line (HC-1) were incubated with different imatinib concentrations for 96 hours. Magnetic resonance spectroscopy on cell acid extracts was performed to evaluate [1-13C]glucose metabolism, energy state, and changes in endogenous metabolites after incubation with imatinib. Imatinib induced a concentration-dependent inhibition of cell proliferation in CML-T1 (IC50, 0.69 +/- 0.06 micromol/L) and K562 cells (IC50, 0.47 +/- 0.04 micromol/L), but not in HC-1 cells. There were no metabolic changes in imatinib-treated HC-1 cells. In BCR-ABL-positive cells, the relevant therapeutic concentrations of imatinib (0.1-1.0 micromol/L) decreased glucose uptake from the media by suppressing glycolytic cell activity (C3-lactate at 0.25 mmol/L, 65% for K562 and 77% for CML-T1 versus control). Additionally, the activity of the mitochondrial Krebs cycle was increased (C4-glutamate at 0.25 micromol/L, 147% for K562 and 170% for CML-T1). The improvement in mitochondrial glucose metabolism resulted in an increased energy state (nucleoside triphosphate/nucleoside diphosphate at 0.25 micromol/L, 130% for K562 and 125% for CML-T1). Apoptosis was observed at higher concentrations. Unlike standard chemotherapeutics, imatinib, without cytocidal activity, reverses the Warburg effect in BCR-ABL-positive cells by switching from glycolysis to mitochondrial glucose metabolism, resulting in decreased glucose uptake and higher energy state.
    [Abstract] [Full Text] [Related] [New Search]