Related Experiment Video

Updated: May 22, 2026

Assessing Cellular Target Engagement by SHP2 (PTPN11) Phosphatase Inhibitors
08:45

Assessing Cellular Target Engagement by SHP2 (PTPN11) Phosphatase Inhibitors

Published on: July 17, 2020

Nongenomic Mechanisms of PTEN Regulation

Jimmie E Fata1, Shawon Debnath, Edmund C Jenkins

  • 1Department of Biology, College of Staten Island, 2800 Victory Boulevard, Staten Island, NY 10314, USA.

International Journal of Cell Biology
|April 27, 2012
PubMed

Insights

PTEN, a tumor suppressor, can drive cancer when its localization or levels are disrupted, even without mutations. Understanding these regulatory mechanisms is key to preventing oncogenic transformation.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • PTEN is a recognized tumor suppressor gene.
  • Recent findings indicate that altered PTEN localization and expression levels, independent of mutations, can lead to abnormal cellular outcomes and oncogenic transformation.
  • Understanding the regulation of PTEN is crucial for comprehending its role in cancer development.

Purpose of the Study:

  • To review the essential regulatory mechanisms of PTEN function.
  • To highlight how deregulation of these mechanisms contributes to oncogenesis.
  • To emphasize PTEN's role beyond its tumor suppressor function, focusing on its regulation.

Main Methods:

  • Literature review and synthesis of existing research on PTEN regulation.
  • Discussion of key regulatory pathways including ubiquitination, complex formation, nuclear localization, and microRNA control.
  • Analysis of how these mechanisms impact PTEN function independently of genetic mutations.

Main Results:

  • PTEN ubiquitination is a critical post-translational modification affecting its stability and function.
  • PTEN interacts with adherens junction components, influencing cell adhesion and migration.
  • PTEN nuclear localization plays a role in regulating cellular processes beyond its canonical cytoplasmic functions.
  • MicroRNA-mediated regulation fine-tunes PTEN expression levels and activity.

Conclusions:

  • Deregulation of PTEN's cellular localization and expression levels is a significant driver of oncogenic transformation.
  • Mechanisms such as ubiquitination, complex formation, nuclear import, and microRNA control are vital for PTEN's function and are independent of gene mutations.
  • Targeting these regulatory pathways offers potential therapeutic strategies for cancers associated with PTEN dysfunction.

More Related Videos

Yeast As a Chassis for Developing Functional Assays to Study Human P5314:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Development and Application of Rapamycin-regulated Tyrosine Phosphatases06:56

Development and Application of Rapamycin-regulated Tyrosine Phosphatases

Published on: September 6, 2024

Related Concept Videos

Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a rapamycin-insensitive companion...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.