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2004 MAY 5 - (NewsRx.com & NewsRx.net) -- Cyclin-dependent kinase inhibitor p21 induces Flt3-ITD leukemogenesis.
"Flt3 is a type III RTK and approximately 30% of AML patients harbor an internal tandem duplication (ITD) of the juxta-membrane region or a point mutation of the Flt3 protein leading to the constitutive activation of downstream signaling pathways and aberrant cell growth. The cyclin-dependent kinase inhibitor p21 inhibits cell growth when expressed at high levels and induces cell growth when expressed at lower levels." The "role of Flt3-ITD in the regulation of p21" was addressed in this study, wrote scientists at the Mount Sinai School of Medicine.
"Co-transfection of p21 promoter-luciferase constructs with Flt3-ITD plasmid into K562 and BaF3 cells results in the induction of p21 promoter activity and a -692/-684 STAT site is important for the induction. STAT5a binds specifically to this element and Flt3-ITD enhances the protein binding to this site. Overexpression of Flt3-ITD led to the induction of ...