PTEN (phosphatase and tensin homology on chromosome 10) dephosphorylates proteins and lipids such as AKT and phosphatidylinositol 3,4,5-triphosphate (PIP3) and therefore functions as a key regulatory enzyme in a central signal transduction pathway. It also interacts with proteins Shc and FAK to promote apoptosis when necessary and to regulate cell division and migration.1 PTEN is considered a tumor suppressor as loss-of-function mutations in PTEN often result in human cancers including melanoma and prostate carcinoma.2,3 PTEN is expressed in almost all tissues of the body as a 403 amino acid protein with an estimated molecular weight of 47kD.
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