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Genome-wide maps of upregulated or downregulated genes in reconstituted SW48O KOEMT cells without or with a nuclear PTEN (C124S) mutant

ABSTRACT: We report that nuclear PTEN negatively regulates DNA-binding activity of SMAD3. We compared upregulated or downregulated genes in colorectal tumor cells without or with a nuclear PTEN (C124S) mutant.

ORGANISM(S): Homo sapiens

PROVIDER: GSE109968 | GEO | 2020/12/31

REPOSITORIES: GEO

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Genome-wide maps of upregulated or downregulated genes in reconstituted SW48O KOEMT cells without or with a nuclear PTEN (C124S) mutant

Project description:Genome-wide maps of upregulated or downregulated genes in reconstituted SW48O KOEMT cells without or with a nuclear PTEN (C124S) mutant

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Genome-wide maps of SMAD3-binding sites in SW480 and their derivative cells.

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Nuclear PTEN safeguards pre-mRNA splicing to link Golgi apparatus for its tumor suppressive role

Project description:Dysregulation of pre-mRNA alternative splicing (AS) is closely associated with cancers. However, the relationships between the AS and classic oncogenes/tumor suppressors are largely unknown. Here we show that the deletion of tumor suppressor PTEN alters pre-mRNA splicing in its phosphatase-independent manner, and identify262 PTEN-regulated AS events in 293T cells by RNA sequencing, which are associated with significant worse outcome of cancer patients. Based on these findings, we report that nuclear PTEN interacts with the splicing machinery, spliceosome, to regulate its assembly and pre-mRNA splicing. Especially, the exon-2b exclusion of GOLGA2 contributes to PTEN knockdown-induced tumorigenesis by promoting dramatic Golgi extension and secretion, and PTEN depletion significantly sensitizes cancer cells to secretion inhibitors, Brefeldin A and Golgicide A. Given that many cancers lack PTEN expression, our results suggest that Golgi secretion inhibitors alone or in combination with PI3K/Akt kinase inhibitors may be therapeutically useful for PTEN-deficient cancers.

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High dose isoleucine stabilizes nuclear PTEN to suppress the proliferation of lung cancer

Project description:High dose isoleucine stabilizes nuclear PTEN to suppress the proliferation of lung cancer

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Inhibition of nuclear PTEN tyrosine phosphorylation enhances glioma radiation sensitivity through attenuated DNA repair

Project description:Glioblastoma (GBM) is the most lethal brain tumour that occurs in adults and treatment for GBM has been largely unsuccessful. Ionizing radiation (IR) and chemotherapeutic agents are employed as standard of care treatment for GBM patients and both result in DNA damage. Previous data identified phosphorylation of PTEN at tyrosine 240 (pY240) in samples from patients with recurrent GBM receiving standard of care treatment and was associated with decreased overall survival. Here we demonstrate that pY240 PTEN that was triggered by FGFR2 signaling, enhanced DNA repair by facilitating the loading of PTEN onto chromatin through its interaction with KI-67 and subsequent recruitment of the DNA repair protein, RAD51, to sites of DNA damage. Thus, tumour cells with pY240 PTEN are efficient at repairing DNA damage which would be predicted to result in resistance to therapy. These findings suggest the FGFR-pY240 PTEN-DNA repair mechanism as a therapeutic target for enhancing GBM therapy.

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2023-04-17 | GSE206157 | GEO

PTEN-L induce PTEN-null tumor cells dormancy but lung outgrowth.

Project description:PTEN is one of the most frequently mutated tumor suppressor genes, its loss has been reported in multiple tumor types and is associated with a poor outcome. PTEN-L, as a secreted isoform of PTEN, with the ability to enter cells and inhibit tumor cell growth via inhibiting AKT mediated cell proliferation. However, the distinct effect of PTEN-L on PTEN-expression or PTEN-loss tumor cells is not known yet. Here, we identified PTEN-L treatment facilitate E0771-PTEN-null tumor cells, but not PTEN-wide-type tumor cells lung outgrowth. RNA-seq and Western blot analysis suggest PTEN-L stimulation induced PTEN-null tumor cells dormancy, namely, upregulation of dormancy markers p16 and p27, cell cycle arrest, reduced cell proliferation and chemotherapy drugs resistance. Further study suggested PTEN-L mediated p38 signaling activation play the major role for PTEN-null tumor cell dormancy. The p38 inhibitor, SB202190 significantly reversed the PTEN-L induced PTEN-null tumor cells dormancy and outgrowth in lungs. Further investigation indicated the dormant PTEN-null tumor cells could escape from immunosurveillance and thus outgrowth in lungs, as PTEN-L did not promote PTEN-null tumor cells outgrowth in lung of SCID mice. Therefore, we propose that PTEN-L protects PTEN-null tumor cells from immune attack during lung metastasis via activating dormancy related pathways. This study identified PTEN-L as an activator of PTEN-loss tumor cells dormancy, which enables the efficient seeding and outgrowth of tumor cells in metastatic niches. Overall, we highlight PTEN expression status decides the outcome of PTEN-L mediated anti-tumor therapy.

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Project description:We intended to elucidate the underlying mechanism of PTEN-Nedd8 in tumorigenesis. So, we firstly employed affinity purification and mass spectrometry to interrogate PTEN-Nedd8 interactome in nucleus.

2022-05-20 | PXD011395 | Pride

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