© 2000 by Oxford University Press
Journal of the National Cancer Institute, Vol. 92, No. 20, 1641-1650,
October 18, 2000
© 2000 Oxford University Press
Role of 
1 Acid Glycoprotein in the In Vivo Resistance of Human BCR-ABL+ Leukemic Cells to the Abl Inhibitor STI571
Affiliations of authors: C. Gambacorti-Passerini, Department of Experimental Oncology, Istituto Nazionale Tumori, Milan, Italy, and Section of Hematology, University of Milano Bicocca, S. Gerardo Hospital, Monza, Italy; R. Barni, P. le Coutre, G. Cabrita, L. Cleris, F. Rossi, F. Formelli, Department of Experimental Oncology, Istituto Nazionale Tumori, Milan; M. Zucchetti, M. D'Incalci, Mario Negri Institute for Pharmacological Research, Milan; E. Gianazza, Department of Pharmacological Sciences, University of Milano; J. Brueggen, R. Cozens, In Vivo Pharmacology Unit, Oncology Research, Novartis Pharma AG, Basel, Switzerland; P. Pioltelli, E. Pogliani, G. Corneo, Section of Hematology, University of Milano Bicocca, S. Gerardo Hospital.
Correspondence to: Carlo Gambacorti-Passerini, M.D., Department of Experimental Oncology, Istituto Nazionale Tumori, Via Venezian 1, 20133 Milan, Italy (e-mail: Gambacorti{at}istitutotumori.mi.it).
Background: Chronic myeloid leukemia is caused by a chromosomal translocation that results in an oncogenic fusion protein, Bcr-Abl. Bcr-Abl is a tyrosine kinase whose activity is inhibited by the antineoplastic drug STI571. This drug can cure mice given an injection of human leukemic cells, but treatment ultimately fails in animals that have large tumors when treatment is initiated. We created a mouse model to explore the mechanism of resistance in vivo. Methods: Nude mice were injected with KU812 Bcr-Abl+ human leukemic cells. After 1 day (no evident tumors), 8 days, or 15 days (tumors >1 g), mice were treated with STI571 (160 mg/kg every 8 hours). Cells recovered from relapsing animals were used for in vitro experiments. Statistical tests were two-sided. Results: Tumors regressed initially in all STI571-treated mice, but all mice treated 15 days after injection of tumor cells eventually relapsed. Relapsed animals did not respond to further STI571 treatment, and their Bcr-Abl kinase activity in vivo was not inhibited by STI571, despite high plasma concentrations of the drug. However, tumor cells from resistant animals were sensitive to STI571 in vitro, suggesting that a molecule in the plasma of relapsed animals may inactivate the drug. The plasma protein 
1 acid glycoprotein (AGP) bound STI571 at physiologic concentrations in vitro and blocked the ability of STI571 to inhibit Bcr-Abl kinase activity in a dose-dependent manner. Plasma AGP concentrations were strongly associated with tumor load. Erythromycin competed with STI571 for AGP binding. When animals bearing large tumors were treated with STI571 alone or with a combination of STI571 and erythromycin, greater tumor reductions and better long-term tumor-free survival (10 of 12 versus one of 13 at day 180; P<.001) were observed after the combination treatment. Conclusion: AGP in the plasma of relapsed animals binds to STI571, preventing this compound from inhibiting the Bcr/Abl tyrosine kinase. Molecules such as erythromycin that compete with STI571 for binding to AGP may enhance the therapeutic potential of this drug.
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