Protein phosphatase 2A (PP2A), a drugable tumor suppressor in Ph1(+) leukemias.

Cancer Metastasis Reviews
Danilo Perrotti, Paolo Neviani

Abstract

Protein phosphatase-2A (PP2A) is one of the major cellular serine-threonine phosphatases and is involved in the regulation of cell homeostasis through the negative regulation of signaling pathways initiated by protein kinases. As several cancers are characterized by the aberrant activity of oncogenic kinases, it was not surprising that a phosphatase like PP2A has progressively been considered as a potential tumor suppressor. Indeed, multiple solid tumors (e.g. melanomas, colorectal carcinomas, lung and breast cancers) present with genetic and/or functional inactivation of different PP2A subunits and, therefore, loss of PP2A phosphatase activity towards certain substrates. Likewise, impaired PP2A phosphatase activity has been linked to B-cell chronic lymphocytic leukemia, Philadelphia-chromosome positive acute lymphoblastic leukemia and blast crisis chronic myelogenous leukemia. Remarkably, drugs such as forskolin, 1,9-dideoxy-forskolin and FTY720 which lead to PP2A activation effectively antagonize leukemogenesis in both in vitro and in vivo models of these cancers. Thus, PP2A is now in the spotlight as a highly promising drugable target for the development of a new series of anticancer agents potentially capable of overcoming ...Continue Reading

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