We have reported previously that the PTEN COOH-terminal 33 amino acids play a role in the maintenance of PTEN protein stability (Tolkacheva and Chan, Oncogene, 19: 680–689, 2000). By site-directed mutagenesis, we identified two threonine residues within this COOHterminal region at codon 382 and 383 that may be targets for phosphorylation events. Interestingly, PTEN mutants rendered phosphorylat...

Although phosphatase and tensin homologue deleted on chromosome 10 (PTEN) localization in the nucleus and cytoplasm is established, the mechanism is unknown. PTEN is a tumor suppressor phosphatase that causes cell cycle arrest and/or apoptosis. Nuclear-cytoplasmic compartmentalization may be a novel mechanism in regulating these events. PTEN does not contain a traditional nuclear localization s...

PTEN is among the most commonly mutated tumor suppressor genes in human cancer. However, studying the role of PTEN in the pathogenesis of cancer has been limited, in part, by the paucity of human cell-based isogenic systems that faithfully model PTEN loss. In an effort to remedy this problem, gene editing was used to correct an endogenous mutant allele of PTEN in two human glioblastoma multifor...

Somatic and germline mutations in PTEN (phosphatase and tensin homolog deleted on chromosome 10) are found in sporadic cancers and Cowden syndrome patients, respectively. Recent identification of naturally occurring cancer and germline mutations within the ATP-binding motifs of PTEN (heretofore referred to as PTEN ATP-binding mutations) has revealed that these mutations disrupted the subcellula...

Mutations in the phosphatase and tensin homolog (PTEN) gene leading to PTEN protein deletion and subsequent activation of the PI3K/Akt signaling pathway are common in cancer. Here we show that PTEN inactivation in human T cell acute lymphoblastic leukemia (T-ALL) cells is not always synonymous with PTEN gene lesions and diminished protein expression. Samples taken from patients with T-ALL at th...

htp:// D ow nladed from The tumor suppressor PTEN restrains cell migration and invasion by a mechanism that is independent of inhibition of the PI3K pathway and decreased activation of the kinase AKT. PREX2, a widely distributed GEF that activates the GTPase RAC1, binds to and inhibits PTEN. We used mouse embryonic fibroblasts and breast cancer cell lines to show that PTEN suppresses cell migra...

The tumor suppressor PTEN is a phosphatase using FAK and Shc as direct substrates, and Akt as a key effector via PIP3. PTEN regulates cell migration and may influence metastases. We quantified PTEN in 135 clear cell renal cell carcinomas (ccRCC) by Western blot analysis and found statistically significant lower PTEN expression in patients who died, usually caused by metastases, within 5 years a...

Phosphatase and tensin homolog (PTEN) is a tumor suppressor gene located at human chromosome 10q23, might play an important role in cell proliferation, cell cycle and apoptosis of cancer cells. In this study, the eukaryotic expression vectors pBP-wt-PTEN (containing a wild-type PTEN gene) and pBP-G129R-PTEN (containing a mutant PTEN gene) were used to transfect breast cancer ZR-75-1 cells. Afte...

A number of observations have radically expanded our knowledge regarding the signaling pathways that regulate the tumor suppressor PTEN. These findings are derived from the molecular characterization of cancer-associated dominantnegative PTEN mutants, as well as the identification of alternative forms and intracellular localizations of PTEN. The lipid and protein phosphatase PTEN (Phosphatase a...

The phosphatase and tensin homolog deleted on chromosome 10 (PTEN) tumor suppressor is a phosphatase that antagonizes the phosphoinositol-3-kinase/AKT signaling pathway and suppresses cell survival as well as cell proliferation. To investigate the molecular role of PTEN expression and mutation in colorectal carcinomas, we performed immunohistochemistry to detect PTEN expression on tissue microa...