Reference Detail

Ref Type

Journal Article

PMID

(24569456)

Authors

Gritsman K, Yuzugullu H, Von T, Yan H, Clayton L, Fritsch C, Maira SM, Hollingworth G, Choi C, Khandan T, Paktinat M, Okabe RO, Roberts TM, Zhao JJ

Title

Hematopoiesis and RAS-driven myeloid leukemia differentially require PI3K isoform p110α.

Journal	Vol	Issue	Date	Pages	Journal Short Title
The Journal of clinical investigation	124	4	2014 Apr	1794-809	J Clin Invest

URL

Abstract Text

The genes encoding RAS family members are frequently mutated in juvenile myelomonocytic leukemia (JMML) and acute myeloid leukemia (AML). RAS proteins are difficult to target pharmacologically; therefore, targeting the downstream PI3K and RAF/MEK/ERK pathways represents a promising approach to treat RAS-addicted tumors. The p110α isoform of PI3K (encoded by Pik3ca) is an essential effector of oncogenic KRAS in murine lung tumors, but it is unknown whether p110α contributes to leukemia. To specifically examine the role of p110α in murine hematopoiesis and in leukemia, we conditionally deleted p110α in HSCs using the Cre-loxP system. Postnatal deletion of p110α resulted in mild anemia without affecting HSC self-renewal; however, deletion of p110α in mice with KRASG12D-associated JMML markedly delayed their death. Furthermore, the p110α-selective inhibitor BYL719 inhibited growth factor-independent KRASG12D BM colony formation and sensitized cells to a low dose of the MEK inhibitor MEK162. Furthermore, combined inhibition of p110α and MEK effectively reduced proliferation of RAS-mutated AML cell lines and disease in an AML murine xenograft model. Together, our data indicate that RAS-mutated myeloid leukemias are dependent on the PI3K isoform p110α, and combined pharmacologic inhibition of p110α and MEK could be an effective therapeutic strategy for JMML and AML.

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Molecular Profile	Treatment Approach

Gene Name	Source	Synonyms	Protein Domains	Gene Description	Gene Role

Therapy Name	Drugs	Efficacy Evidence	Clinical Trials

Drug Name	Trade Name	Synonyms	Drug Classes	Drug Description

Gene	Variant	Impact	Protein Effect	Variant Description	Associated with drug Resistance

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References
NRAS G12D	acute myeloid leukemia	sensitive	Binimetinib	Preclinical	Actionable	In a preclinical study, Binimetinib (MEK162) inhibited growth of acute myeloid leukemia cells that have been demonstrated to harbor NRAS G12D in culture and decreased disease burden in xenograft models with NRAS G12D (PMID: 24569456, PMID: 11238126).	24569456 11238126
NRAS G12D	acute myeloid leukemia	sensitive	Alpelisib + Binimetinib	Preclinical - Cell line xenograft	Actionable	In a preclinical study, the combination of Binimetinib (MEK162) and Alpelisib (BYL719) inhibited proliferation in a human acute myeloid leukemia (AML) cell line harboring NRAS G12D in culture, and decreased disease burden in xenograft models (PMID: 24569456).	24569456