Related Experiment Video
Updated: Apr 21, 2026
Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
Published on: April 13, 2015
Molecular pathways: intercellular PTEN and the potential of PTEN restoration therapy
Benjamin D Hopkins1, Ramon E Parsons2
1Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, New York.
Abstract:
Phosphatase and Tensin homolog deleted on chromosome Ten (PTEN) acts as a tumor suppressor through both PI3K-dependent and -independent mechanisms. Reduced PTEN activity has been shown to affect not only tumor cell proliferation and survival but also the microenvironmental context in which nascent tumors develop. As a result of the multifaceted tumor-suppressive roles of PTEN, tumors evolve by selecting for clones in which PTEN activity is lost. PTEN activity within tumors can be modulated in numerous ways, including direct mutation, epigenetic regulation, and amplification or mutation of other proteins that can regulate or degrade PTEN. These events functionally prevent PTEN protein from acting within tumor cells. Paracrine roles for PTEN gene products (exosomal PTEN and PTEN-L) have recently been identified, through which PTEN gene products produced in one cell are able to enter recipient cells and contribute to PTEN functions. In preclinical models purified PTEN-L protein was able to enter tumor xenografts and downregulate PI3K signaling as well as cause tumor cell death. Here, we review the role of PTEN as a multifaceted tumor suppressor and reflect upon the potential for PTEN restoration therapy.
Insights
Phosphatase and Tensin homolog deleted on chromosome Ten (PTEN) is a crucial tumor suppressor. This review explores PTEN's multifaceted roles in cancer and the potential of PTEN restoration therapies.
Area of Science:
- Molecular Biology
- Oncology
- Biochemistry
Background:
- Phosphatase and Tensin homolog deleted on chromosome Ten (PTEN) is a key tumor suppressor involved in PI3K-dependent and -independent pathways.
- Loss of PTEN activity impacts tumor cell proliferation, survival, and the tumor microenvironment, driving tumor evolution.
- PTEN function can be compromised through mutations, epigenetic changes, or alterations in regulatory proteins.
Purpose of the Study:
- To review the diverse tumor-suppressive functions of PTEN.
- To discuss the mechanisms by which PTEN activity is lost in tumors.
- To explore the potential of PTEN restoration therapy for cancer treatment.
Main Methods:
- Literature review of PTEN's role in cancer.
- Analysis of PTEN modulation through genetic and epigenetic mechanisms.
- Examination of preclinical data on PTEN-L protein in tumor models.
Main Results:
- PTEN loss is a common evolutionary strategy in tumors.
- Paracrine functions of PTEN, including exosomal PTEN and PTEN-L, contribute to tumor suppression.
- PTEN-L protein demonstrated efficacy in preclinical models by downregulating PI3K signaling and inducing tumor cell death.
Conclusions:
- PTEN is a critical multifaceted tumor suppressor.
- Understanding PTEN's complex roles is essential for developing effective cancer therapies.
- PTEN restoration therapy holds promise for future cancer treatment strategies.
Related Concept Videos
02:23Abnormal Proliferation
01:22iPS Cell Differentiation