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A Cell-Based Screen for Resistance of Bcr-Abl-positive Leukemia Identifies the Mutation Pattern for PD166326, an Alternative Abl Kinase Inhibitor

A Cell-Based Screen for Resistance of Bcr-Abl-positive Leukemia Identifies the Mutation Pattern for PD166326, an Alternative Abl Kinase Inhibitor

Nikolas von Bubnoff, Darren R Veach, Heiko van der Kuip, Walter E Aulitzky, Jana Sänger, Petra Seipel, William G Bornmann, Christian Peschel, Bayard Clarkson, Justus Duyster

Blood. 2005 Feb 15;105(4):1652-9.

PMID: 15459011

Abstract:

In Philadelphia-positive (Ph(+)) leukemia, point mutations within the Bcr-Abl kinase domain emerged as a major mechanism of resistance to imatinib mesylate. We established a cell-based screening strategy for detection of clinically relevant point mutations using Bcr-Abl-transformed Ba/F3 cells. We identified 32 different single-point mutations within the kinase domain of Bcr-Abl. The pattern and frequency of mutations in this cell culture-based screen resembled the pattern and frequency observed in resistant patients. We then applied this screen to an alternative Abl kinase inhibitor. Using PD166326, the frequency of resistant colonies emerging at 5 to 10 times the median growth inhibition (IC50) of PD166326 was significantly lower than with imatinib. In addition, PD166326 produced a distinct pattern of Bcr-Abl mutations. The majority of mutations that came up with both imatinib and PD166326 could effectively be suppressed by increasing the dose of PD166326 to 50 to 500 nM. In contrast, only a few mutations could be suppressed by increasing the imatinib dose to 5 to 10 microM. However, 3 mutations affecting F317 displayed complete resistance to PD166326, but could be effectively inhibited by standard concentrations of imatinib. Thus, this robust and simple screening system provides a rational basis for combinatorial and sequential treatment strategies in targeted cancer therapy.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP185039912	PD166326		185039-91-2	Price

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