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PTEN in brain tumors
Daphne Haas-Kogan1, David Stokoe
1Department of Radiation Oncology, University of California, San Francisco, CA 94143-1708, USA. dhaaskogan@radonc.ucsf.edu
Abstract:
The tumor suppressor PTEN dephosphorylates phospholipids generated through the activity of PI3K. PTEN thus antagonizes PI3K activity and regulates a multitude of cellular processes such as angiogenesis, motility, invasiveness, survival and proliferation, all of which can initiate and sustain the malignant phenotype. Although PTEN's lipid phosphatase activity is key to its tumor suppressive functions, it also dephosphorylates protein substrates and interacts with other key regulatory molecules, salient among them the tumor suppressor p53. Given the critical roles of PTEN in cellular homeostasis, it is not surprising that both PTEN expression levels and PTEN protein activities are tightly controlled by a complex conglomeration of molecules that regulate post-translational modifications, subcellular localization, transcriptional activation and transcriptional repression. As one of the most commonly altered molecules in human disease, PTEN plays an important role in a myriad of signaling cascades, and plays a central role in normal brain development and brain tumor pathogenesis. As such it influences prognosis of human cancer, predicts response to therapy, constitutes the lynchpin of genetic syndromes, and may underlie neurocognitive abnormalities such as autism spectrum disorders and Alzheimer's disease. Thus, targeting PTEN and its signaling affiliates sows the seeds for combating not only cancer but also neurocognitive disorders.
Insights
The tumor suppressor PTEN regulates cellular processes crucial for preventing cancer. Dysregulation of PTEN impacts brain development and neurocognitive disorders, highlighting its therapeutic potential.
Area of Science:
- Molecular Biology
- Oncology
- Neuroscience
Background:
- The phosphatase and tensin homolog (PTEN) is a critical tumor suppressor.
- PTEN antagonizes phosphatidylinositol 3-kinase (PI3K) signaling, regulating cell survival, proliferation, and motility.
- PTEN's functions extend beyond lipid phosphatase activity, involving protein dephosphorylation and interactions with key regulators like p53.
Purpose of the Study:
- To review the multifaceted roles of PTEN in cellular homeostasis and disease.
- To highlight PTEN's involvement in both cancer pathogenesis and neurodevelopmental/neurocognitive disorders.
- To underscore the therapeutic potential of targeting PTEN and its associated signaling pathways.
Main Methods:
- Review of existing literature on PTEN's molecular functions and clinical relevance.
- Analysis of PTEN's involvement in signaling cascades controlling cellular processes.
- Examination of PTEN's role in normal brain development and pathogenesis of brain tumors and neurocognitive conditions.
Main Results:
- PTEN expression and activity are tightly regulated by complex molecular mechanisms.
- Altered PTEN is implicated in numerous human diseases, including various cancers and neurocognitive disorders like autism spectrum disorders and Alzheimer's disease.
- PTEN influences cancer prognosis, therapeutic response, and genetic syndromes.
Conclusions:
- PTEN is a pivotal regulator of cellular processes, with its dysregulation contributing to significant human diseases.
- Targeting PTEN offers a promising therapeutic strategy for both cancer and neurocognitive disorders.
- Further research into PTEN signaling pathways is crucial for developing effective treatments.
