Cooperating proteins destroy suppressors.
Position | Cancer - Brief article |
Two previously unconnected cancer-promoting proteins team up to ambush a critical tumor suppressor by evicting it from the cell's nucleus and then marking it for death by a protein-shredding mechanism, reports a team led by scientists at the University of Texas M.D. Anderson Cancer Center, Houston. The research is the first to illuminate a mechanism of attack on FOXO3a, a member of the forkhead family of tumor-suppressing proteins, notes senior author Mien-Chie Hung, chair of the Department of Molecular and Cellular Oncology.
"We know that FOXO3a is inactivated in about 80% of breast tumors, and that it's likely to be inactivated in other solid tumors because three major oncogenic pathways separately target it," Hung points out. "The implication is that forkhead activation will be a great therapeutic target because it would be a powerful tumor suppressor."
Hung and his colleagues focused on the effect of the RAS-ERK signaling pathway, which is known to promote tumor growth and proliferation. FOXO3a and its other forkhead cousins have a specific structure--the...
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