JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
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Contributions of the Raf/MEK/ERK, PI3K/PTEN/Akt/mTOR and Jak/STAT pathways to leukemia.

Leukemia 2008 April
Mutations and chromosomal translocations occur in leukemic cells that result in elevated expression or constitutive activation of various growth factor receptors and downstream kinases. The Raf/MEK/ERK, PI3K/PTEN/Akt/mTOR and Jak/STAT pathways are often activated by mutations in upstream genes. The Raf/MEK/ERK and PI3K/PTEN/Akt/mTOR pathways are regulated by upstream Ras that is frequently mutated in human cancer. Recently, it has been observed that the FLT-3 and Jak kinases and the phosphatase and tensin homologue deleted on chromosome 10 (PTEN) phosphatase are also frequently mutated or their expression is altered in certain hematopoietic neoplasms. Many of the events elicited by the Raf/MEK/ERK, PI3K/PTEN/Akt/mTOR and Jak/STAT pathways have direct effects on survival pathways. Aberrant regulation of the survival pathways can contribute to uncontrolled cell growth and lead to leukemia. In this review, we describe the Raf/MEK/ERK, PI3K/PTEN/Akt/mTOR and Jak/STAT signaling cascades and summarize recent data regarding the regulation and mutation status of these pathways and their involvement in leukemia.

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