alexa PTEN: life as a tumor suppressor.
Neurology

Neurology

Journal of Alzheimers Disease & Parkinsonism

Author(s): Simpson L, Parsons R, Simpson L, Parsons R

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Abstract PTEN, a tumor suppressor located at chromosome 10q23, is mutated in a variety of sporadic cancers and in two autosomal dominant hamartoma syndromes. PTEN is a phosphatase which dephosphorylates phosphatidylinositol (3,4,5)-triphosphate (PtdIns-3,4,5-P3), an important intracellular second messenger, lowering its level within the cell. By dephosphorylating PtdIns-3,4,5-P3, PTEN acts in opposition to phosphatidylinositol 3-kinase (PI3K), which has a pivotal role in the creation of PtdIns-3,4,5-P3. PtdIns-3,4,5-P3 is necessary for the activation of Akt, a serine/threonine kinase involved in cell growth and survival. By blocking the activation of Akt, PTEN regulates cellular processes such as cell cycling, translation, and apoptosis. In this review, we will discuss the identification of PTEN, its mutational status in cancer, its role as a regulator of PI3K, and its domain structure. Copyright 2001 Academic Press. This article was published in Exp Cell Res and referenced in Journal of Alzheimers Disease & Parkinsonism

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