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The PI3K-Akt-mTOR pathway in initiation and progression of thyroid tumors Saji M; Ringel MDMol Cell Endocrinol 2010[May]; 321 (1): 20-8The phosphoinositide-3 (OH) kinase (PI3K) signaling cascade is involved in regulating glucose uptake and metabolism, growth, motility, and other essential functions for cell survival. Unregulated activation of this pathway commonly occurs in cancer through a variety of mechanisms, including genetic mutations of kinases and regulatory proteins, epigenetic alterations that alter gene expression and translation, and posttranslational modifications. In thyroid cancer, constitutive activation of PI3K signaling has been shown to play a role in the genetic predisposition for thyroid neoplasia in Cowden's syndrome, and is recognized to be frequently overactivated in sporadic forms of thyroid cancer including those with aggressive clinical behaviors. In this review, the key signaling molecules in the PI3K signaling cascade, the abnormalities known to occur in thyroid cancer, and the potential for therapeutic targeting of PI3K pathway members will be discussed.|*Disease Progression[MESH]|Animals[MESH]|Humans[MESH]|Intracellular Signaling Peptides and Proteins/*metabolism[MESH]|Phosphatidylinositol 3-Kinases/*metabolism[MESH]|Phosphoinositide-3 Kinase Inhibitors[MESH]|Precancerous Conditions/*enzymology/pathology[MESH]|Protein Serine-Threonine Kinases/*metabolism[MESH]|Proto-Oncogene Proteins c-akt/*metabolism[MESH]|TOR Serine-Threonine Kinases[MESH]|Thyroid Neoplasms/*enzymology/*pathology/therapy[MESH] |
