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Phosphatase and tensin homologue deleted on chromosome 10: extending its PTENtacles
1Pharmacology and Pharmaceutical Sciences, USC School of Pharmacy, Los Angeles, CA 90089, United States. bstiles@usc.edu
Abstract:
Since its discovery in 1997, phosphatase and tensin homologue deleted on chromosome 10 (PTEN) has become one of the most important molecules in tumor biology. Mutations, deletions or dysregulation of PTEN is found in many human tumors. Recent studies have extended the reach of PTEN to include diabetes and neurological diseases such as Parkinson's and autism. In this review, we summarize the traditionally characterized function of PTEN as the lipid phosphatase that dephosphorylates PI-3,4,5-P(3), and several other newly discovered functions. The inhibition of the phosphatidylinositol-3-kinase (PI3K)/AKT signaling pathway may account for most of PTEN's tumor suppressing function. However, other growth inhibiting functions of PTEN may not involve this pathway. PTEN can also inhibit growth through its protein phosphatase activity and in ways not related to its enzymatic activity at all. We survey the many functions and biochemical interactions of PTEN in cytoplasm, the nucleus and throughout the cell in this paper.
Insights
Phosphatase and tensin homologue deleted on chromosome 10 (PTEN) is crucial in tumor biology and other diseases. This review details PTEN's diverse functions beyond its lipid phosphatase role, including protein phosphatase activity and non-enzymatic mechanisms.
Area of Science:
- Molecular Biology
- Oncology
- Biochemistry
Background:
- Phosphatase and tensin homologue deleted on chromosome 10 (PTEN) is a critical tumor suppressor.
- PTEN alterations are frequent in human cancers.
- PTEN's roles extend to neurological disorders and diabetes.
Purpose of the Study:
- To review the established and newly discovered functions of PTEN.
- To explore PTEN's mechanisms of action, including its lipid and protein phosphatase activities.
- To survey PTEN's interactions and functions across cellular compartments.
Main Methods:
- Literature review of PTEN research.
- Analysis of PTEN's biochemical activities.
- Examination of PTEN's signaling pathways.
Main Results:
- PTEN dephosphorylates PI-3,4,5-P(3), inhibiting the PI3K/AKT pathway, a key tumor-suppressive function.
- PTEN exhibits protein phosphatase activity, contributing to growth inhibition.
- PTEN possesses non-enzymatic functions in regulating cell growth and survival.
Conclusions:
- PTEN is a multifaceted protein with diverse roles in cancer and other diseases.
- PTEN's tumor suppressor functions involve both PI3K/AKT-dependent and independent pathways.
- Understanding PTEN's comprehensive functions is vital for therapeutic development.
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