Greatwall kinase regulates acute myeloid leukaemia cell division through a non-canonical mechanism.

Greatwall kinase regulates cytokinesis in AML cells through a novel pathway involving MARK3, independent of the ENSA-PP2A-B55 mechanism.

• Why it matters: Understanding how cell cycle regulation differs in AML compared to other cancers can reveal new therapeutic targets. The role of Greatwall kinase in leukemic cell division was previously unclear, especially beyond its known function in solid tumors.
• What they did: The study used pharmacological and genetic perturbation experiments to show that AML cells depend on Greatwall activity for proliferation, but this does not involve the ENSA-PP2A-B55 pathway. Instead, Greatwall influences cytokinesis by phosphorylating proteins like MARK3, a direct substrate identified in AML cells.
• The result: These findings demonstrate that Greatwall kinase operates through a distinct signaling network in AML, uncovering a new mechanism of cell cycle regulation that could inform targeted therapies for leukemia.