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St. Jude Children's Research Hospital study yields new strategy against high-risk leukemia
Date:8/29/2013

s by other drugs already in development."

Tyrosine kinase inhibitors are designed to block the BCR-ABL protein. The drugs have revolutionized treatment of chronic myeloid leukemia (CML), which strikes adults and includes the same chromosomal rearrangement as Ph-positive ALL. But results of TKI treatment were less dramatic for adults and children with Ph-positive ALL, and drug resistance remains a problem.

For this study, researchers combined one of two tyrosine kinase inhibitors, imatinib or dasatnib, with the experimental drug navitoclax. The latter drug disrupts the ability of the proteins BCL-2 and BCL-XL to protect cancer cells from apoptosis. Along with MCL1, BCL-2 and BCL-XL are members of a family of proteins that regulate apoptosis. MCL1, BCL-2 and BCL-XL work to prevent cell death, even cancer cell death, by blocking the activity of proteins that promote the process.

Since MCL1 is elevated in a number of cancers and is associated with cancer-drug resistance, a similar two-drug approach might also enhance the effectiveness of tyrosine kinase inhibitors for treatment of other cancers. "We are very interested in pursuing this strategy," Opferman said.

Earlier discoveries made by the Opferman laboratory revealed that MCL-1 also protects heart health by preventing loss of heart muscle cells through apoptosis. "Together these findings suggest that MCL1 is a relevant target for cancer treatment, but efforts should focus on diminishing the expression of MCL1, rather than completely eliminating its function," said first author Brian Koss, a staff scientist in Opferman's laboratory.

In this study, the investigators showed that MCL1 was required for cancer cell survival throughout the Ph-positive ALL disease process, beginning when white blood cells known as B lymphocytes were transformed from normal to tumor cells.

Scientists showed that deleting Mcl1 from the leukemia cells of mice blocked canc
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SOURCE St. Jude Children's Research Hospital
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