1
|
Qiu L, Li R, Wang Y, Lu Z, Tu Z, Liu H. PTEN inhibition enhances sensitivity of ovarian cancer cells to the poly (ADP-ribose) polymerase inhibitor by suppressing the MRE11-RAD50-NBN complex. Br J Cancer 2024:10.1038/s41416-024-02749-w. [PMID: 38866962 DOI: 10.1038/s41416-024-02749-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 05/29/2024] [Accepted: 06/03/2024] [Indexed: 06/14/2024] Open
Abstract
BACKGROUND Poly (ADP-ribose) polymerase inhibitors (PARPis) can effectively treat ovarian cancer patients with defective homologous recombination (HR). Loss or dysfunction of PTEN, a typical tumour suppressor, impairs double-strand break (DSB) repair. Hence, we explored the possibility of inhibiting PTEN to induce HR deficiency (HRD) for PARPi application. METHODS Functional studies using PTEN inhibitor VO-OHpic and PARPi olaparib were performed to explore the molecular mechanisms in vitro and in vivo. RESULTS In this study, the combination of VO-OHpic with olaparib exhibited synergistic inhibitory effects on ovarian cancer cells was demonstrated. Furthermore, VO-OHpic was shown to enhance DSBs by reducing nuclear expression of PTEN and inhibiting HR repair through the modulation of MRE11-RAD50-NBN (MRN) complex, critical for DSB repair. TCGA and GTEx analysis revealed a strong correlation between PTEN and MRN in ovarian cancer. Mechanistic studies indicated that VO-OHpic reduced expression of MRN, likely by decreasing PTEN/E2F1-mediated transcription. Moreover, PTEN-knockdown inhibited expression of MRN, increased sensitivities to olaparib, and induced DSBs. In vivo experiments showed that the combination of VO-OHpic with olaparib exhibited enhanced inhibitory effects on tumour growth. CONCLUSIONS Collectively, this study highlights the potential of PTEN inhibitors in combination therapy with PARPis to create HRD for HRD-negative ovarian cancers.
Collapse
Affiliation(s)
- Lipeng Qiu
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Ruyan Li
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
- School of Health Medicine, Nantong Institute of Technology, Nantong, 226000, Jiangsu, China
| | - Yue Wang
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Ziwen Lu
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Zhigang Tu
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China.
| | - Hanqing Liu
- School of Pharmacy, Jiangsu University, Zhenjiang, 212013, Jiangsu, China.
| |
Collapse
|
2
|
Richard SA. Advances in synthetic lethality modalities for glioblastoma multiforme. Open Med (Wars) 2024; 19:20240981. [PMID: 38868315 PMCID: PMC11167713 DOI: 10.1515/med-2024-0981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 04/24/2024] [Accepted: 05/20/2024] [Indexed: 06/14/2024] Open
Abstract
Glioblastoma multiforme (GBM) is characterized by a high mortality rate, high resistance to cytotoxic chemotherapy, and radiotherapy due to its highly aggressive nature. The pathophysiology of GBM is characterized by multifarious genetic abrasions that deactivate tumor suppressor genes, induce transforming genes, and over-secretion of pro-survival genes, resulting in oncogene sustainability. Synthetic lethality is a destructive process in which the episode of a single genetic consequence is tolerable for cell survival, while co-episodes of multiple genetic consequences lead to cell death. This targeted drug approach, centered on the genetic concept of synthetic lethality, is often selective for DNA repair-deficient GBM cells with restricted toxicity to normal tissues. DNA repair pathways are key modalities in the generation, treatment, and drug resistance of cancers, as DNA damage plays a dual role as a creator of oncogenic mutations and a facilitator of cytotoxic genomic instability. Although several research advances have been made in synthetic lethality modalities for GBM therapy, no review article has summarized these therapeutic modalities. Thus, this review focuses on the innovative advances in synthetic lethality modalities for GBM therapy.
Collapse
Affiliation(s)
- Seidu A. Richard
- Department of Medicine, Princefield University, P. O. Box MA128, Volta Region, Ho, Ghana
- Institute of Neuroscience, Third Affiliated Hospital, Zhengzhou University, Zhengzhou, 450052, China
| |
Collapse
|
3
|
Wu J, Wen T, Marzio A, Song D, Chen S, Yang C, Zhao F, Zhang B, Zhao G, Ferri A, Cheng H, Ma J, Ren H, Chen QY, Yang Y, Qin S. FBXO32-mediated degradation of PTEN promotes lung adenocarcinoma progression. Cell Death Dis 2024; 15:282. [PMID: 38643215 PMCID: PMC11032391 DOI: 10.1038/s41419-024-06635-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 03/21/2024] [Accepted: 03/28/2024] [Indexed: 04/22/2024]
Abstract
FBXO32, a member of the F-box protein family, is known to play both oncogenic and tumor-suppressive roles in different cancers. However, the functions and the molecular mechanisms regulated by FBXO32 in lung adenocarcinoma (LUAD) remain unclear. Here, we report that FBXO32 is overexpressed in LUAD compared with normal lung tissues, and high expression of FBXO32 correlates with poor prognosis in LUAD patients. Firstly, we observed with a series of functional experiments that FBXO32 alters the cell cycle and promotes the invasion and metastasis of LUAD cells. We further corroborate our findings using in vivo mouse models of metastasis and confirmed that FBXO32 positively regulates LUAD tumor metastasis. Using a proteomic-based approach combined with computational analyses, we found a positive correlation between FBXO32 and the PI3K/AKT/mTOR pathway, and identified PTEN as a FBXO32 interactor. More important, FBXO32 binds PTEN via its C-terminal substrate binding domain and we also validated PTEN as a bona fide FBXO32 substrate. Finally, we demonstrated that FBXO32 promotes EMT and regulates the cell cycle by targeting PTEN for proteasomal-dependent degradation. In summary, our study highlights the role of FBXO32 in promoting the PI3K/AKT/mTOR pathway via PTEN degradation, thereby fostering lung adenocarcinoma progression.
Collapse
Affiliation(s)
- Jie Wu
- Department of Thoracic Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
- Department of Radiation Oncology, Shaanxi Provincial People's Hospital, Xi'an, Shaanxi, China
| | - Ting Wen
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Antonio Marzio
- Department of Pathology and Laboratory Medicine, Meyer Cancer Center, Weill Cornell Medical Center, New York, NY, USA
| | - Dingli Song
- Department of Thoracic Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Sisi Chen
- Department of Oncology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Chengcheng Yang
- Department of Oncology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Fengyu Zhao
- Department of Oncology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Boxiang Zhang
- Department of Thoracic Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Guang Zhao
- Department of Thoracic Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Alessandra Ferri
- Department of Pathology and Laboratory Medicine, Meyer Cancer Center, Weill Cornell Medical Center, New York, NY, USA
| | - Hao Cheng
- Department of Rehabilitation, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Jiao Ma
- Department of Rehabilitation, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Hong Ren
- Department of Thoracic Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Qiao Yi Chen
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
| | - Yiping Yang
- Clinical Research Center for Shaanxi Provincial Radiotherapy, Department of Radiation Oncology, Shaanxi Provincial Cancer Hospital, Xi'an, Shaanxi, China.
| | - Sida Qin
- Department of Thoracic Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China.
- Biobank, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China.
| |
Collapse
|
4
|
Giri H, Biswas I, Rezaie AR. Thrombomodulin Regulates PTEN/AKT Signaling Axis in Endothelial Cells. Arterioscler Thromb Vasc Biol 2024; 44:352-365. [PMID: 38059351 PMCID: PMC10841639 DOI: 10.1161/atvbaha.123.320000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 11/27/2023] [Indexed: 12/08/2023]
Abstract
BACKGROUND We recently demonstrated that deletion of thrombomodulin gene from endothelial cells results in upregulation of proinflammatory phenotype. In this study, we investigated the molecular basis for the altered phenotype in thrombomodulin-deficient (TM-/-) cells. METHODS Different constructs containing deletions or mutations in the cytoplasmic domain of thrombomodulin were prepared and introduced to TM-/- cells. The phenotype of cells expressing different derivatives of thrombomodulin and tissue samples of thrombomodulin-knockout mice were analyzed for expression of distinct regulatory genes in established signaling assays. RESULTS The phosphatase and tensin homolog were phosphorylated and its recruitment to the plasma membrane was impaired in TM-/- cells, leading to hyperactivation of AKT (protein kinase B) and phosphorylation-dependent nuclear exclusion of the transcription factor, forkhead box O1. The proliferative/migratory properties of TM-/- cells were enhanced, and cells exhibited hypersensitivity to stimulation by angiopoietin 1 and vascular endothelial growth factor. Reexpression of wild-type thrombomodulin in TM-/- cells normalized the cellular phenotype; however, thrombomodulin lacking its cytoplasmic domain failed to restore the normal phenotype in TM-/- cells. Increased basal permeability and loss of VE-cadherin were restored to normal levels by reexpression of wild-type thrombomodulin but not by a thrombomodulin construct lacking its cytoplasmic domain. A thrombomodulin cytoplasmic domain deletion mutant containing 3-membrane-proximal Arg-Lys-Lys residues restored the barrier-permeability function of TM-/- cells. Enhanced phosphatase and tensin homolog phosphorylation and activation of AKT and mTORC1 (mammalian target of rapamycin complex 1) were also observed in the liver of thrombomodulin-KO mice. CONCLUSIONS These results suggest that the cytoplasmic domain of thrombomodulin interacts with the actin cytoskeleton and plays a crucial role in regulation of phosphatase and tensin homolog/AKT signaling in endothelial cells.
Collapse
Affiliation(s)
- Hemant Giri
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation
| | - Indranil Biswas
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation
| | - Alireza R. Rezaie
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104
| |
Collapse
|
5
|
Kang SC, Sarn NB, Venegas J, Tan Z, Hitomi M, Eng C. Germline PTEN genotype-dependent phenotypic divergence during the early neural developmental process of forebrain organoids. Mol Psychiatry 2023:10.1038/s41380-023-02325-3. [PMID: 38030818 DOI: 10.1038/s41380-023-02325-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 10/22/2023] [Accepted: 11/13/2023] [Indexed: 12/01/2023]
Abstract
PTEN germline mutations account for ~0.2-1% of all autism spectrum disorder (ASD) cases, as well as ~17% of ASD patients with macrocephaly, making it one of the top ASD-associated risk genes. Individuals with germline PTEN mutations receive the molecular diagnosis of PTEN Hamartoma Tumor Syndrome (PHTS), an inherited cancer predisposition syndrome, about 20-23% of whom are diagnosed with ASD. We generated forebrain organoid cultures from gene-edited isogenic human induced pluripotent stem cells (hiPSCs) harboring a PTENG132D (ASD) or PTENM134R (cancer) mutant allele to model how these mutations interrupt neurodevelopmental processes. Here, we show that the PTENG132D allele disrupts early neuroectoderm formation during the first several days of organoid generation, and results in deficient electrophysiology. While organoids generated from PTENM134R hiPSCs remained morphologically similar to wild-type organoids during this early stage in development, we observed disrupted neuronal differentiation, radial glia positioning, and cortical layering in both PTEN-mutant organoids at the later stage of 72+ days of development. Perifosine, an AKT inhibitor, reduced over-activated AKT and partially corrected the abnormalities in cellular organization observed in PTENG132D organoids. Single cell RNAseq analyses on early-stage organoids revealed that genes related to neural cell fate were decreased in PTENG132D mutant organoids, and AKT inhibition was capable of upregulating gene signatures related to neuronal cell fate and CNS maturation pathways. These findings demonstrate that different PTEN missense mutations can have a profound impact on neurodevelopment at diverse stages which in turn may predispose PHTS individuals to ASD. Further study will shed light on ways to mitigate pathological impact of PTEN mutants on neurodevelopment by stage-specific manipulation of downstream PTEN signaling components.
Collapse
Affiliation(s)
- Shin Chung Kang
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Nicholas B Sarn
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Juan Venegas
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Zhibing Tan
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH, 44195, USA
| | - Masahiro Hitomi
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH, 44195, USA
| | - Charis Eng
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA.
- Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH, 44195, USA.
- Center for Personalized Genetic Healthcare, Medical Specialties Institute, Cleveland Clinic, Cleveland, OH, 44195, USA.
- Case Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, OH, 44106, USA.
- Taussig Cancer Institute, Cleveland Clinic Foundation, Cleveland, OH, 44195, USA.
- Department of Genetics and Genome Sciences, Case Western Reserve University School of Medicine, Cleveland, OH, 44106, USA.
| |
Collapse
|
6
|
Ertay A, Ewing RM, Wang Y. Synthetic lethal approaches to target cancers with loss of PTEN function. Genes Dis 2023; 10:2511-2527. [PMID: 37533462 PMCID: PMC7614861 DOI: 10.1016/j.gendis.2022.12.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 12/26/2022] [Accepted: 12/27/2022] [Indexed: 02/05/2023] Open
Abstract
Phosphatase and tensin homolog (PTEN) is a tumour suppressor gene and has a role in inhibiting the oncogenic AKT signalling pathway by dephosphorylating phosphatidylinositol 3,4,5-triphosphate (PIP3) into phosphatidylinositol 4,5-bisphosphate (PIP2). The function of PTEN is regulated by different mechanisms and inactive PTEN results in aggressive tumour phenotype and tumorigenesis. Identifying targeted therapies for inactive tumour suppressor genes such as PTEN has been challenging as it is difficult to restore the tumour suppressor functions. Therefore, focusing on the downstream signalling pathways to discover a targeted therapy for inactive tumour suppressor genes has highlighted the importance of synthetic lethality studies. This review focuses on the potential synthetic lethality genes discovered in PTEN-inactive cancer types. These discovered genes could be potential targeted therapies for PTEN-inactive cancer types and may improve the treatment response rates for aggressive types of cancer.
Collapse
Affiliation(s)
- Ayse Ertay
- Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - Rob M. Ewing
- Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - Yihua Wang
- Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
| |
Collapse
|
7
|
Torres-Montaner A. Interactions between the DNA Damage Response and the Telomere Complex in Carcinogenesis: A Hypothesis. Curr Issues Mol Biol 2023; 45:7582-7616. [PMID: 37754262 PMCID: PMC10527771 DOI: 10.3390/cimb45090478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 09/12/2023] [Accepted: 09/14/2023] [Indexed: 09/28/2023] Open
Abstract
Contrary to what was once thought, direct cancer originating from normal stem cells seems to be extremely rare. This is consistent with a preneoplastic period of telomere length reduction/damage in committed cells that becomes stabilized in transformation. Multiple observations suggest that telomere damage is an obligatory step preceding its stabilization. During tissue turnover, the telomeres of cells undergoing differentiation can be damaged as a consequence of defective DNA repair caused by endogenous or exogenous agents. This may result in the emergence of new mechanism of telomere maintenance which is the final outcome of DNA damage and the initial signal that triggers malignant transformation. Instead, transformation of stem cells is directly induced by primary derangement of telomere maintenance mechanisms. The newly modified telomere complex may promote survival of cancer stem cells, independently of telomere maintenance. An inherent resistance of stem cells to transformation may be linked to specific, robust mechanisms that help maintain telomere integrity.
Collapse
Affiliation(s)
- Antonio Torres-Montaner
- Department of Pathology, Queen’s Hospital, Rom Valley Way, Romford, London RM7 OAG, UK;
- Departamento de Bioquímica y Biologia Molecular, Universidad de Cadiz, Puerto Real, 11510 Cadiz, Spain
| |
Collapse
|
8
|
Strauss JD, Pursell ZF. Replication DNA polymerases, genome instability and cancer therapies. NAR Cancer 2023; 5:zcad033. [PMID: 37388540 PMCID: PMC10304742 DOI: 10.1093/narcan/zcad033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 05/24/2023] [Accepted: 06/25/2023] [Indexed: 07/01/2023] Open
Abstract
It has been over a decade since the initial identification of exonuclease domain mutations in the genes encoding the catalytic subunits of replication DNA polymerases ϵ and δ (POLE and POLD1) in tumors from highly mutated endometrial and colorectal cancers. Interest in studying POLE and POLD1 has increased significantly since then. Prior to those landmark cancer genome sequencing studies, it was well documented that mutations in replication DNA polymerases that reduced their DNA synthesis accuracy, their exonuclease activity or their interactions with other factors could lead to increased mutagenesis, DNA damage and even tumorigenesis in mice. There are several recent, well-written reviews of replication DNA polymerases. The aim of this review is to gather and review in some detail recent studies of DNA polymerases ϵ and δ as they pertain to genome instability, cancer and potential therapeutic treatments. The focus here is primarily on recent informative studies on the significance of mutations in genes encoding their catalytic subunits (POLE and POLD1), mutational signatures, mutations in associated genes, model organisms, and the utility of chemotherapy and immune checkpoint inhibition in polymerase mutant tumors.
Collapse
Affiliation(s)
- Juliet D Strauss
- Department of Biochemistry and Molecular Biology, Tulane University School of Medicine, New Orleans, 70118 LA, USA
| | - Zachary F Pursell
- Department of Biochemistry and Molecular Biology, Tulane University School of Medicine, New Orleans, 70118 LA, USA
- Tulane Cancer Center, Tulane University School of Medicine, New Orleans, 70118 LA, USA
| |
Collapse
|
9
|
Frazier TW, Busch RM, Klaas P, Lachlan K, Jeste S, Kolevzon A, Loth E, Harris J, Speer L, Pepper T, Anthony K, Graglia JM, Delagrammatikas C, Bedrosian-Sermone S, Beekhuyzen J, Smith-Hicks C, Sahin M, Eng C, Hardan AY, Uljarević M. Development of informant-report neurobehavioral survey scales for PTEN hamartoma tumor syndrome and related neurodevelopmental genetic syndromes. Am J Med Genet A 2023. [PMID: 37045800 DOI: 10.1002/ajmg.a.63195] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/06/2023] [Accepted: 03/18/2023] [Indexed: 04/14/2023]
Abstract
There are few well-validated measures that are appropriate for assessing the full range of neurobehavioral presentations in PTEN hamartoma tumor syndrome (PHTS) and other neurodevelopmental genetic syndromes (NDGS). As potential therapeutics are developed, having reliable, valid, free, and easily accessible measures to track a range of neurobehavioral domains will be crucial for future clinical trials. This study focused on the development and initial psychometric evaluation of a set of freely available informant-report survey scales for PHTS-the Neurobehavioral Evaluation Tool (NET). Concept elicitation, quantitative ratings, and cognitive interviewing processes were conducted with stakeholders and clinician-scientist experts, used to identify the most important neurobehavioral domains for this population, and to ensure items were appropriate for the full range of individuals with PHTS. Results of this process identified a PHTS neurobehavioral impact model with 11 domains. The final NET scales assessing these domains were administered to a sample of 384 participants (median completion time = 20.6 min), including 32 people with PHTS, 141 with other NDGS, 47 with idiopathic neurodevelopmental disorder (NDD), and 164 neurotypical controls. Initial psychometric results for the total scores of each scale indicated very good model (ω = 0.83-0.99) and internal consistency reliability (α = 0.82-0.98) as well as excellent test-retest reproducibility at 1-month follow-up (r = 0.78-0.98) and stability at 4-month follow-up (r = 0.76-0.96). Conditional reliability estimates indicated very strong measurement precision in key score ranges for assessing PHTS and other people with NDGS and/or idiopathic NDD. Comparisons across domains between PHTS and the other groups revealed specific patterns of symptoms and functioning, including lower levels of challenging behavior and more developed daily living and executive functioning skills relative to other NDGS. The NET appears to be a reliable and potentially useful tool for clinical characterization and monitoring of neurobehavioral symptoms in PHTS and may also have utility in the assessment of other NDGS and idiopathic NDD. Additional validation work, including convergent and discriminant validity analyses, are needed to replicate and extend these observations.
Collapse
Affiliation(s)
- Thomas W Frazier
- Department of Psychology, John Carroll University, University Heights, Ohio, USA
- Departments of Pediatrics and Psychiatry,, SUNY Upstate Medical University, Syracuse, New York, USA
| | - Robyn M Busch
- Department of Neurology, Neurological Institute, Clinic Cleveland, Cleveland, Ohio, USA
- Genomic Medicine Institute, Lerner Research Institute, Clinic Cleveland, Cleveland, Ohio, USA
| | - Patricia Klaas
- Department of Neurology, Neurological Institute, Clinic Cleveland, Cleveland, Ohio, USA
| | - Katherine Lachlan
- Human Genetics and Genomic Medicine, Faculty of Medicine, University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Shafali Jeste
- Division of Neurology, Children's Hospital of Los Angeles, Los Angeles, California, USA
| | - Alexander Kolevzon
- Departments of Psychiatry and Pediatrics, Seaver Autism Center for Research and Treatment Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Eva Loth
- Department of Forensic and Neurodevelopmental Science, Institute of Psychiatry, Psychology and Neuroscience Kings College London, London, UK
| | - Jacqueline Harris
- Krieger Institute and Johns Hopkins University School of Medicine, Department of Neurology Kennedy, Baltimore, Maryland, USA
| | - Leslie Speer
- Department of Psychology, Frazier Behavioral Health, Cleveland, Ohio, USA
| | - Tom Pepper
- PTEN Research Foundation, Cheltenham, UK
| | - Kristin Anthony
- PTEN Hamartoma Tumor Syndrome Foundation, Huntsville, Alabama, USA
| | | | | | | | | | - Constance Smith-Hicks
- Krieger Institute and Johns Hopkins University School of Medicine, Department of Neurology Kennedy, Baltimore, Maryland, USA
| | - Mustafa Sahin
- Rosamund Stone Zander Translational Neuroscience Center, Department of Neurology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Charis Eng
- Genomic Medicine Institute, Lerner Research Institute, Clinic Cleveland, Cleveland, Ohio, USA
| | - Antonia Y Hardan
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California, USA
| | - Mirko Uljarević
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California, USA
- Melbourne School of Psychological Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Victoria, Australia
| |
Collapse
|
10
|
Chen J, Liu F, Wu J, Yang Y, He J, Wu F, Yang K, Li J, Jiang Z, Jiang Z. Effect of STK3 on proliferation and apoptosis of pancreatic cancer cells via PI3K/AKT/mTOR pathway. Cell Signal 2023; 106:110642. [PMID: 36871796 DOI: 10.1016/j.cellsig.2023.110642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 02/12/2023] [Accepted: 02/28/2023] [Indexed: 03/07/2023]
Abstract
Pancreatic cancer, as a malignant tumor with a very poor prognosis, has a high mortality. It is imperative to clarify the mechanism of pancreatic cancer development and find suitable targets for diagnosis and treatment. Serine/threonine kinase 3 (STK3) is one of the core kinases of the Hippo pathway and has the ability to inhibit tumor growth. But the biological function of STK3 in pancreatic cancer remains unknown. Here, we confirmed that STK3 has an impact on the growth, apoptosis, and metastasis of pancreatic cancer cells and investigated the related molecular mechanisms. In our research, we found that STK3 is reduced in pancreatic cancer by RT-qPCR, IHC and IF, its expression level is correlated with the clinicopathological features. CCK-8 assay, colony formation assay and flow cytometry were used to detect the effect of STK3 on the proliferation and apoptosis of pancreatic cancer cells. In addition, the Transwell assay was used to detect the ability of cell migration and invasion. The results showed that STK3 promoted apoptosis and inhibited cell migration, invasion and proliferation in pancreatic cancer. Gene set enrichment analysis (GSEA) and western blotting are used to predict and verify the pathways related to STK3. Subsequently, we found that the effect of STK3 on proliferation and apoptosis is closely related to the PI3K/AKT/mTOR pathway. Moreover, the assistance of RASSF1 plays a significant role in the regulation of PI3K/AKT/mTOR pathway by STK3. The nude mouse xenograft experiment demonstrated the tumor suppressive ability of STK3 in vivo. Collectively, this study found that STK3 regulates pancreatic cancer cell proliferation and apoptosis by suppressing the PI3K/AKT/mTOR pathway with the assistance of RASSF1.
Collapse
Affiliation(s)
- Jun Chen
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Fuqiang Liu
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Jiao Wu
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Yichun Yang
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Jin He
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Fan Wu
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Kun Yang
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Junfeng Li
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Zhongxiang Jiang
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Zheng Jiang
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China.
| |
Collapse
|
11
|
Gupta S, Sharma P, Chaudhary M, Premraj S, Kaur S, Vijayan V, Arun MG, Prasad NG, Ramachandran R. Pten associates with important gene regulatory network to fine-tune Müller glia-mediated zebrafish retina regeneration. Glia 2023; 71:259-283. [PMID: 36128720 DOI: 10.1002/glia.24270] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 08/24/2022] [Accepted: 08/25/2022] [Indexed: 11/11/2022]
Abstract
Unlike mammals, zebrafish possess a remarkable ability to regenerate damaged retina after an acute injury. Retina regeneration in zebrafish involves the induction of Müller glia-derived progenitor cells (MGPCs) exhibiting stem cell-like characteristics, which are capable of restoring all retinal cell-types. The induction of MGPC through Müller glia-reprograming involves several cellular, genetic and biochemical events soon after a retinal injury. Despite the knowledge on the importance of Phosphatase and tensin homolog (Pten), which is a dual-specificity phosphatase and tumor suppressor in the maintaining of cellular homeostasis, its importance during retina regeneration remains unknown. Here, we explored the importance of Pten during zebrafish retina regeneration. The Pten gets downregulated upon retinal injury and is absent from the MGPCs, which is essential to trigger Akt-mediated cellular proliferation essential for retina regeneration. We found that the downregulation of Pten in the post-injury retina accelerates MGPCs formation, while its overexpression restricts the regenerative response. We observed that Pten regulates the proliferation of MGPCs not only through Akt pathway but also by Mmp9/Notch signaling. Mmp9-activity is essential to induce the proliferation of MGPCs in the absence of Pten. Lastly, we show that expression of Pten is fine-tuned through Mycb/histone deacetylase1 and Tgf-β signaling. The present study emphasizes on the stringent regulation of Pten and its crucial involvement during the zebrafish retina regeneration.
Collapse
Affiliation(s)
- Shivangi Gupta
- Department of Biological Sciences, Indian Institute of Science Education and Research, Mohali, Punjab, India
| | - Poonam Sharma
- Department of Biological Sciences, Indian Institute of Science Education and Research, Mohali, Punjab, India
| | - Mansi Chaudhary
- Department of Biological Sciences, Indian Institute of Science Education and Research, Mohali, Punjab, India
| | - Sharanya Premraj
- Department of Biological Sciences, Indian Institute of Science Education and Research, Mohali, Punjab, India
| | - Simran Kaur
- Department of Biological Sciences, Indian Institute of Science Education and Research, Mohali, Punjab, India
| | - Vijithkumar Vijayan
- Department of Biological Sciences, Indian Institute of Science Education and Research, Mohali, Punjab, India
| | - Manas Geeta Arun
- Department of Biological Sciences, Indian Institute of Science Education and Research, Mohali, Punjab, India
| | - Nagaraj Guru Prasad
- Department of Biological Sciences, Indian Institute of Science Education and Research, Mohali, Punjab, India
| | - Rajesh Ramachandran
- Department of Biological Sciences, Indian Institute of Science Education and Research, Mohali, Punjab, India
| |
Collapse
|
12
|
Langdon CG. Nuclear PTEN's Functions in Suppressing Tumorigenesis: Implications for Rare Cancers. Biomolecules 2023; 13:biom13020259. [PMID: 36830628 PMCID: PMC9953540 DOI: 10.3390/biom13020259] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 01/25/2023] [Accepted: 01/28/2023] [Indexed: 01/31/2023] Open
Abstract
Phosphatase and tensin homolog (PTEN) encodes a tumor-suppressive phosphatase with both lipid and protein phosphatase activity. The tumor-suppressive functions of PTEN are lost through a variety of mechanisms across a wide spectrum of human malignancies, including several rare cancers that affect pediatric and adult populations. Originally discovered and characterized as a negative regulator of the cytoplasmic, pro-oncogenic phosphoinositide-3-kinase (PI3K) pathway, PTEN is also localized to the nucleus where it can exert tumor-suppressive functions in a PI3K pathway-independent manner. Cancers can usurp the tumor-suppressive functions of PTEN to promote oncogenesis by disrupting homeostatic subcellular PTEN localization. The objective of this review is to describe the changes seen in PTEN subcellular localization during tumorigenesis, how PTEN enters the nucleus, and the spectrum of impacts and consequences arising from disrupted PTEN nuclear localization on tumor promotion. This review will highlight the immediate need in understanding not only the cytoplasmic but also the nuclear functions of PTEN to gain more complete insights into how important PTEN is in preventing human cancers.
Collapse
Affiliation(s)
- Casey G. Langdon
- Department of Pediatrics, Darby Children’s Research Institute, Medical University of South Carolina, Charleston, SC 29425, USA; ; Tel.: +1-(843)-792-9289
- Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| |
Collapse
|
13
|
Targeting PTEN Regulation by Post Translational Modifications. Cancers (Basel) 2022; 14:cancers14225613. [PMID: 36428706 PMCID: PMC9688753 DOI: 10.3390/cancers14225613] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 11/07/2022] [Accepted: 11/11/2022] [Indexed: 11/17/2022] Open
Abstract
Phosphatidylinositol-3,4,5-triphosphate (PIP3) is a lipidic second messenger present at very low concentrations in resting normal cells. PIP3 levels, though, increase quickly and transiently after growth factor addition, upon activation of phosphatidylinositol 3-kinase (PI3-kinase). PIP3 is required for the activation of intracellular signaling pathways that induce cell proliferation, cell migration, and survival. Given the critical role of this second messenger for cellular responses, PIP3 levels must be tightly regulated. The lipid phosphatase PTEN (phosphatase and tensin-homolog in chromosome 10) is the phosphatase responsible for PIP3 dephosphorylation to PIP2. PTEN tumor suppressor is frequently inactivated in endometrium and prostate carcinomas, and also in glioblastoma, illustrating the contribution of elevated PIP3 levels for cancer development. PTEN biological activity can be modulated by heterozygous gene loss, gene mutation, and epigenetic or transcriptional alterations. In addition, PTEN can also be regulated by post-translational modifications. Acetylation, oxidation, phosphorylation, sumoylation, and ubiquitination can alter PTEN stability, cellular localization, or activity, highlighting the complexity of PTEN regulation. While current strategies to treat tumors exhibiting a deregulated PI3-kinase/PTEN axis have focused on PI3-kinase inhibition, a better understanding of PTEN post-translational modifications could provide new therapeutic strategies to restore PTEN action in PIP3-dependent tumors.
Collapse
|
14
|
Perevalova AM, Kobelev VS, Sisakyan VG, Gulyaeva LF, Pustylnyak VO. Role of Tumor Suppressor PTEN and Its Regulation in Malignant Transformation of Endometrium. BIOCHEMISTRY. BIOKHIMIIA 2022; 87:1310-1326. [PMID: 36509719 DOI: 10.1134/s0006297922110104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Tumor-suppressive effects of PTEN are well-known, but modern evidence suggest that they are not limited to its ability to inhibit pro-oncogenic PI3K/AKT signaling pathway. Features of PTEN structure facilitate its interaction with substrates of different nature and display its activity in various ways both in the cytoplasm and in cell nuclei, which makes it possible to take a broader look at its ability to suppress tumor growth. The possible mechanisms of the loss of PTEN effects are also diverse - PTEN can be regulated at many levels, leading to change in the protein activity or its amount in the cell, while their significance for the development of malignant tumors has yet to be studied. Here we summarize the current data on the PTEN structure, its functions and changes in its regulatory mechanisms during malignant transformation of the cells, focusing on one of the most sensitive to the loss of PTEN types of malignant tumors - endometrial cancer.
Collapse
Affiliation(s)
| | - Vyacheslav S Kobelev
- Federal Research Center of Fundamental and Translational Medicine, Novosibirsk, 630117, Russia
| | - Virab G Sisakyan
- Novosibirsk Regional Oncology Center, Novosibirsk, 630108, Russia
| | - Lyudmila F Gulyaeva
- Novosibirsk State University, Novosibirsk, 630090, Russia.,Federal Research Center of Fundamental and Translational Medicine, Novosibirsk, 630117, Russia
| | - Vladimir O Pustylnyak
- Novosibirsk State University, Novosibirsk, 630090, Russia.,Federal Research Center of Fundamental and Translational Medicine, Novosibirsk, 630117, Russia
| |
Collapse
|
15
|
Jacobi A, Tran NM, Yan W, Benhar I, Tian F, Schaffer R, He Z, Sanes JR. Overlapping transcriptional programs promote survival and axonal regeneration of injured retinal ganglion cells. Neuron 2022; 110:2625-2645.e7. [PMID: 35767994 PMCID: PMC9391321 DOI: 10.1016/j.neuron.2022.06.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 04/08/2022] [Accepted: 06/03/2022] [Indexed: 12/12/2022]
Abstract
Injured neurons in the adult mammalian central nervous system often die and seldom regenerate axons. To uncover transcriptional pathways that could ameliorate these disappointing responses, we analyzed three interventions that increase survival and regeneration of mouse retinal ganglion cells (RGCs) following optic nerve crush (ONC) injury, albeit not to a clinically useful extent. We assessed gene expression in each of 46 RGC types by single-cell transcriptomics following ONC and treatment. We also compared RGCs that regenerated with those that survived but did not regenerate. Each intervention enhanced survival of most RGC types, but type-independent axon regeneration required manipulation of multiple pathways. Distinct computational methods converged on separate sets of genes selectively expressed by RGCs likely to be dying, surviving, or regenerating. Overexpression of genes associated with the regeneration program enhanced both survival and axon regeneration in vivo, indicating that mechanistic analysis can be used to identify novel therapeutic strategies.
Collapse
Affiliation(s)
- Anne Jacobi
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, and Department of Neurology, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA; Department of Molecular and Cellular Biology, Center for Brain Science, Harvard University, 52 Oxford Street, Cambridge, MA 02138, USA
| | - Nicholas M Tran
- Department of Molecular and Cellular Biology, Center for Brain Science, Harvard University, 52 Oxford Street, Cambridge, MA 02138, USA; Department of Molecular and Human Genetics, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA
| | - Wenjun Yan
- Department of Molecular and Cellular Biology, Center for Brain Science, Harvard University, 52 Oxford Street, Cambridge, MA 02138, USA
| | - Inbal Benhar
- Broad Institute of Harvard and MIT, Cambridge, MA 02142, USA
| | - Feng Tian
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, and Department of Neurology, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA
| | - Rebecca Schaffer
- Department of Molecular and Cellular Biology, Center for Brain Science, Harvard University, 52 Oxford Street, Cambridge, MA 02138, USA
| | - Zhigang He
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, and Department of Neurology, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA.
| | - Joshua R Sanes
- Department of Molecular and Cellular Biology, Center for Brain Science, Harvard University, 52 Oxford Street, Cambridge, MA 02138, USA.
| |
Collapse
|
16
|
Wang YH, Sheetz MP. When PIP2 Meets p53: Nuclear Phosphoinositide Signaling in the DNA Damage Response. Front Cell Dev Biol 2022; 10:903994. [PMID: 35646908 PMCID: PMC9136457 DOI: 10.3389/fcell.2022.903994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 04/19/2022] [Indexed: 11/13/2022] Open
Abstract
The mechanisms that maintain genome stability are critical for preventing tumor progression. In the past decades, many strategies were developed for cancer treatment to disrupt the DNA repair machinery or alter repair pathway selection. Evidence indicates that alterations in nuclear phosphoinositide lipids occur rapidly in response to genotoxic stresses. This implies that nuclear phosphoinositides are an upstream element involved in DNA damage signaling. Phosphoinositides constitute a new signaling interface for DNA repair pathway selection and hence a new opportunity for developing cancer treatment strategies. However, our understanding of the underlying mechanisms by which nuclear phosphoinositides regulate DNA damage repair, and particularly the dynamics of those processes, is rather limited. This is partly because there are a limited number of techniques that can monitor changes in the location and/or abundance of nuclear phosphoinositide lipids in real time and in live cells. This review summarizes our current knowledge regarding the roles of nuclear phosphoinositides in DNA damage response with an emphasis on the dynamics of these processes. Based upon recent findings, there is a novel model for p53’s role with nuclear phosphoinositides in DNA damage response that provides new targets for synthetic lethality of tumors.
Collapse
|
17
|
Hausott B, Glueckert R, Schrott-Fischer A, Klimaschewski L. Signal Transduction Regulators in Axonal Regeneration. Cells 2022; 11:cells11091537. [PMID: 35563843 PMCID: PMC9104247 DOI: 10.3390/cells11091537] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 04/27/2022] [Accepted: 04/28/2022] [Indexed: 11/16/2022] Open
Abstract
Intracellular signal transduction in response to growth factor receptor activation is a fundamental process during the regeneration of the nervous system. In this context, intracellular inhibitors of neuronal growth factor signaling have become of great interest in the recent years. Among them are the prominent signal transduction regulators Sprouty (SPRY) and phosphatase and tensin homolog deleted on chromosome 10 (PTEN), which interfere with major signaling pathways such as extracellular signal-regulated kinase (ERK) or phosphoinositide 3-kinase (PI3K)/Akt in neurons and glial cells. Furthermore, SPRY and PTEN are themselves tightly regulated by ubiquitin ligases such as c-casitas b-lineage lymphoma (c-CBL) or neural precursor cell expressed developmentally down-regulated protein 4 (NEDD4) and by different microRNAs (miRs) including miR-21 and miR-222. SPRY, PTEN and their intracellular regulators play an important role in the developing and the lesioned adult central and peripheral nervous system. This review will focus on the effects of SPRY and PTEN as well as their regulators in various experimental models of axonal regeneration in vitro and in vivo. Targeting these signal transduction regulators in the nervous system holds great promise for the treatment of neurological injuries in the future.
Collapse
Affiliation(s)
- Barbara Hausott
- Institute of Neuroanatomy, Medical University Innsbruck, 6020 Innsbruck, Austria;
- Correspondence:
| | - Rudolf Glueckert
- Department of Otorhinolaryngology, Medical University Innsbruck, 6020 Innsbruck, Austria; (R.G.); (A.S.-F.)
| | - Anneliese Schrott-Fischer
- Department of Otorhinolaryngology, Medical University Innsbruck, 6020 Innsbruck, Austria; (R.G.); (A.S.-F.)
| | - Lars Klimaschewski
- Institute of Neuroanatomy, Medical University Innsbruck, 6020 Innsbruck, Austria;
| |
Collapse
|
18
|
Dall GV, Hamilton A, Ratnayake G, Scott C, Barker H. Interrogating the Genomic Landscape of Uterine Leiomyosarcoma: A Potential for Patient Benefit. Cancers (Basel) 2022; 14:cancers14061561. [PMID: 35326717 PMCID: PMC8946513 DOI: 10.3390/cancers14061561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/10/2022] [Accepted: 03/16/2022] [Indexed: 11/16/2022] Open
Abstract
Uterine leiomyosarcoma (uLMS) is a rare and aggressive gynaecological malignancy. Surgical removal and chemotherapy are commonly used to treat uLMS, but recurrence rates are high. Over the last few decades, clarification of the genomic landscape of uLMS has revealed a number of recurring mutations, including TP53, RB1, ATRX, PTEN, and MED12. Such genomic aberrations are difficult to target therapeutically or are actively targeted in other malignancies, and their potential as targets for the treatment of uLMS remains largely unexplored. Recent identification of deficiencies in homologous recombination in a minority of these tumours, however, has provided a rationale for investigation of PARP inhibitors in this sub-set. Here, we review these mutations and the evidence for therapeutic avenues that may be applied in uLMS. We also provide a comprehensive background on diagnosis and current therapeutic strategies as well as reviewing preclinical models of uLMS, which may be employed not only in testing emerging therapies but also in understanding this challenging and deadly disease.
Collapse
Affiliation(s)
- Genevieve V. Dall
- Walter and Eliza Hall, Institute of Medical Research, Parkville, VIC 3052, Australia; (C.S.); (H.B.)
- Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia;
- Correspondence:
| | - Anne Hamilton
- Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia;
- Peter MacCallum Cancer Centre, Melbourne, VIC 3000, Australia
- Royal Women’s Hospital, Parkville, VIC 3052, Australia;
| | | | - Clare Scott
- Walter and Eliza Hall, Institute of Medical Research, Parkville, VIC 3052, Australia; (C.S.); (H.B.)
- Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia;
- Peter MacCallum Cancer Centre, Melbourne, VIC 3000, Australia
- Royal Women’s Hospital, Parkville, VIC 3052, Australia;
| | - Holly Barker
- Walter and Eliza Hall, Institute of Medical Research, Parkville, VIC 3052, Australia; (C.S.); (H.B.)
- Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia;
| |
Collapse
|
19
|
Liu G, Zuo DY, Yang P, He WJ, Yang Z, Zhang JB, Wu AB, Yi SY, Li HP, Huang T, Liao YC. A Novel Deoxynivalenol-Activated Wheat Arl6ip4 Gene Encodes an Antifungal Peptide with Deoxynivalenol Affinity and Protects Plants against Fusarium Pathogens and Mycotoxins. J Fungi (Basel) 2021; 7:jof7110941. [PMID: 34829228 PMCID: PMC8618893 DOI: 10.3390/jof7110941] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 10/31/2021] [Accepted: 11/03/2021] [Indexed: 12/12/2022] Open
Abstract
Deoxynivalenol (DON) is one of the most widespread trichothecene mycotoxins in contaminated cereal products. DON plays a vital role in the pathogenesis of Fusarium graminearum, but the molecular mechanisms of DON underlying Fusarium–wheat interactions are not yet well understood. In this study, a novel wheat ADP-ribosylation factor-like protein 6-interacting protein 4 gene, TaArl6ip4, was identified from DON-treated wheat suspension cells by suppression subtractive hybridization (SSH). The qRT-PCR result suggested that TaArl6ip4 expression is specifically activated by DON in both the Fusarium intermediate susceptible wheat cultivar Zhengmai9023 and the Fusarium resistant cultivar Sumai3. The transient expression results of the TaARL6IP4::GFP fusion protein indicate that TaArl6ip4 encodes a plasma membrane and nucleus-localized protein. Multiple sequence alignment using microscale thermophoresis showed that TaARL6IP4 comprises a conserved DON binding motif, 67HXXXG71, and exhibits DON affinity with a dissociation constant (KD) of 91 ± 2.6 µM. Moreover, TaARL6IP4 exhibited antifungal activity with IC50 values of 22 ± 1.5 µM and 25 ± 2.6 µM against Fusarium graminearum and Alternaria alternata, respectively. Furthermore, TaArl6ip4 interacted with the plasma membrane of Fusarium graminearum spores, resulting in membrane disruption and the leakage of cytoplasmic materials. The heterologous over-expression of TaArl6ip4 conferred greater DON tolerance and Fusarium resistance in Arabidopsis. Finally, we describe a novel DON-induced wheat gene, TaArl6ip4, exhibiting antifungal function and DON affinity that may play a key role in Fusarium–wheat interactions.
Collapse
Affiliation(s)
- Gang Liu
- Molecular Biotechnology Laboratory of Triticeae Crops, Huazhong Agricultural University, Wuhan 430070, China; (G.L.); (D.-Y.Z.); (P.Y.); (W.-J.H.); (Z.Y.); (J.-B.Z.); (S.-Y.Y.); (H.-P.L.)
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Dong-Yun Zuo
- Molecular Biotechnology Laboratory of Triticeae Crops, Huazhong Agricultural University, Wuhan 430070, China; (G.L.); (D.-Y.Z.); (P.Y.); (W.-J.H.); (Z.Y.); (J.-B.Z.); (S.-Y.Y.); (H.-P.L.)
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of the Chinese Academy of Agricultural Sciences, Anyang 455000, China
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Peng Yang
- Molecular Biotechnology Laboratory of Triticeae Crops, Huazhong Agricultural University, Wuhan 430070, China; (G.L.); (D.-Y.Z.); (P.Y.); (W.-J.H.); (Z.Y.); (J.-B.Z.); (S.-Y.Y.); (H.-P.L.)
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Wei-Jie He
- Molecular Biotechnology Laboratory of Triticeae Crops, Huazhong Agricultural University, Wuhan 430070, China; (G.L.); (D.-Y.Z.); (P.Y.); (W.-J.H.); (Z.Y.); (J.-B.Z.); (S.-Y.Y.); (H.-P.L.)
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Zheng Yang
- Molecular Biotechnology Laboratory of Triticeae Crops, Huazhong Agricultural University, Wuhan 430070, China; (G.L.); (D.-Y.Z.); (P.Y.); (W.-J.H.); (Z.Y.); (J.-B.Z.); (S.-Y.Y.); (H.-P.L.)
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Jing-Bo Zhang
- Molecular Biotechnology Laboratory of Triticeae Crops, Huazhong Agricultural University, Wuhan 430070, China; (G.L.); (D.-Y.Z.); (P.Y.); (W.-J.H.); (Z.Y.); (J.-B.Z.); (S.-Y.Y.); (H.-P.L.)
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Ai-Bo Wu
- Key Laboratory of Food Safety Research Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China;
| | - Shu-Yuan Yi
- Molecular Biotechnology Laboratory of Triticeae Crops, Huazhong Agricultural University, Wuhan 430070, China; (G.L.); (D.-Y.Z.); (P.Y.); (W.-J.H.); (Z.Y.); (J.-B.Z.); (S.-Y.Y.); (H.-P.L.)
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
- Forestry and Fruit Tree Research Institute, Wuhan Academy of Agricultural Sciences, Wuhan 430070, China
| | - He-Ping Li
- Molecular Biotechnology Laboratory of Triticeae Crops, Huazhong Agricultural University, Wuhan 430070, China; (G.L.); (D.-Y.Z.); (P.Y.); (W.-J.H.); (Z.Y.); (J.-B.Z.); (S.-Y.Y.); (H.-P.L.)
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Tao Huang
- Molecular Biotechnology Laboratory of Triticeae Crops, Huazhong Agricultural University, Wuhan 430070, China; (G.L.); (D.-Y.Z.); (P.Y.); (W.-J.H.); (Z.Y.); (J.-B.Z.); (S.-Y.Y.); (H.-P.L.)
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
- Correspondence: (T.H.); (Y.-C.L.)
| | - Yu-Cai Liao
- Molecular Biotechnology Laboratory of Triticeae Crops, Huazhong Agricultural University, Wuhan 430070, China; (G.L.); (D.-Y.Z.); (P.Y.); (W.-J.H.); (Z.Y.); (J.-B.Z.); (S.-Y.Y.); (H.-P.L.)
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
- Correspondence: (T.H.); (Y.-C.L.)
| |
Collapse
|
20
|
Choi BH, Colon TM, Lee E, Kou Z, Dai W. CBX8 interacts with chromatin PTEN and is involved in regulating mitotic progression. Cell Prolif 2021; 54:e13110. [PMID: 34592789 PMCID: PMC8560621 DOI: 10.1111/cpr.13110] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 07/14/2021] [Accepted: 07/27/2021] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVES Besides its role in regulating phosphatidylinositol-3 kinase (PI3K) signalling in the cytosol, PTEN also has a nuclear function. In this study, we attempted to understand the mechanism of chromatin PTEN in suppressing chromosomal instability during cell division. MATERIALS AND METHODS Immunocoprecipitation, ectopic expression, and deletional analyses were used to identify the physical interaction between Chromobox Homolog protein 8 (CBX8) and PTEN, as well as the functional domain(s) of PTEN mediating the interaction. Cell synchronization followed by immunoblotting was employed to study cell cycle regulation of CBX8 and the functional interaction between chromatin PTEN and CBX8. Small interfering RNAs (siRNAs) were used to study the role of PTEN and CBX8 in modulating histone epigenetic markers during the cell cycle. RESULTS Polycomb group (PcG) proteins including CBXs function to repress gene expression in a wide range of organisms including mammals. We recently showed that PTEN interacted with CBX8, a component of Polycomb Repressing Complex 1 (PRC1), and that CBX8 co-localized with PTEN in the nucleus. CBX8 levels were high, coinciding with its phosphorylation in mitosis. Phosphorylation of CBX8 was associated with monoubiquitinated PTEN and phosphorylated-BubR1 on chromatin. Moreover, CBX8 played an important role in cell proliferation and mitotic progression. Significantly, downregulation of either PTEN or CBX8 induced H3K27Me3 epigenetic marker in mitotic cells. CONCLUSION CBX8 is a new component that physically interacts with chromatin PTEN, playing an important role in regulating mitotic progression.
Collapse
Affiliation(s)
- Byeong Hyeok Choi
- Department of Environmental MedicineNew York University Grossman School of MedicineNew YorkNYUSA
| | - Tania Marlyn Colon
- Department of Environmental MedicineNew York University Grossman School of MedicineNew YorkNYUSA
| | - Eunji Lee
- Department of Environmental MedicineNew York University Grossman School of MedicineNew YorkNYUSA
| | - Ziyue Kou
- Department of Environmental MedicineNew York University Grossman School of MedicineNew YorkNYUSA
| | - Wei Dai
- Department of Environmental MedicineNew York University Grossman School of MedicineNew YorkNYUSA
- Department of Biochemistry and Molecular PharmacologyNew York University Langone Medical CenterNew YorkNYUSA
| |
Collapse
|
21
|
Kato T, Igarashi A, Sesaki H, Iijima M. Generating a new mouse model for nuclear PTEN deficiency by a single K13R mutation. Genes Cells 2021; 26:1014-1022. [PMID: 34661323 DOI: 10.1111/gtc.12902] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 10/12/2021] [Accepted: 10/14/2021] [Indexed: 12/01/2022]
Abstract
Many human diseases, including cancer and neurological abnormalities, are linked to deficiencies of phosphatase and tensin homolog deleted on chromosome ten (PTEN), a dual phosphatase that dephosphorylates both lipids and proteins. PTEN functions in multiple intracellular locations, including the plasma membrane and nucleus. Therefore, a critical challenge to understand the pathogenesis of PTEN-associated diseases is to determine the specific role of PTEN at different locations. Toward this goal, the current study generated a mouse line in which lysine 13, which is critical for the nuclear localization of PTEN, is changed to arginine in the lipid-binding domain using the CRISPR-Ca9 gene-editing system. We found that PTENK13R mice show a strong decrease in the localization of PTEN in the nucleus without affecting the protein stability, phosphatase activity, and phosphorylation in the C-terminal tail region. PTENK13R mice are viable but produce smaller neurons and develop microcephaly. These data demonstrate that PTENK13R mice provide a useful animal model to study the role of PTEN in the nucleus in vivo.
Collapse
Affiliation(s)
- Takashi Kato
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Faculty of Pharmacy, Yasuda Women's University, Hiroshima, Japan
| | - Atsushi Igarashi
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Hiromi Sesaki
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Miho Iijima
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| |
Collapse
|
22
|
Abbas A, Padmanabhan R, Eng C. Metabolic stress regulates genome-wide transcription in a PTEN-dependent manner. Hum Mol Genet 2021; 29:2736-2745. [PMID: 32744308 DOI: 10.1093/hmg/ddaa168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/19/2020] [Accepted: 07/27/2020] [Indexed: 12/31/2022] Open
Abstract
PTEN is implicated in a wide variety of pathophysiological conditions and traditionally studied in the context of the PIK3-AKT-mTOR axis. Recent studies from our group and others have reported a novel role of PTEN in the regulation of transcription at the genome-wide scale. This emerging role of PTEN on global transcriptional regulation is providing a better understanding of various diseases, including cancer. Because cancer progression is an energy-demanding process and PTEN is known to regulate metabolic processes, we sought to understand the role of PTEN in transcriptional regulation under metabolic stress, a condition often developing in the tumor microenvironment. In the present study, we demonstrate that PTEN modulates genome-wide RNA Polymerase II occupancy in cells undergoing glucose deprivation. The glucose-deprived PTEN null cells were found to continue global gene transcription, which may activate a survival mode. However, cells with constitutive PTEN expression slow transcription, an evolutionary mechanism that may save cellular energy and activate programmed cell death pathways, in the absence of glucose. Interestingly, alternative exon usage by PTEN null cells is increased under metabolic stress in contrast to PTEN-expressing cells. Overall, our study demonstrates distinct mechanisms involved in PTEN-dependent genome-wide transcriptional control under metabolic stress. Our findings provide a new insight in understanding tumor pathology and how PTEN loss of function, whether by genetic or non-genetic mechanisms, can contribute to a favorable transcriptional program employed by tumor cells to escape apoptosis, hence developing more aggressive and metastatic phenotypes.
Collapse
Affiliation(s)
- Ata Abbas
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA.,Developmental Therapeutics Program, Case Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, OH 44116, USA
| | - Roshan Padmanabhan
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Charis Eng
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA.,Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH 44195, USA.,Department of Genetics and Genome Sciences.,Germline High Risk Focus Group, Case Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, OH 44116, USA
| |
Collapse
|
23
|
Zhao J, Yin L, Jiang L, Hou L, He L, Zhang C. PTEN nuclear translocation enhances neuronal injury after hypoxia-ischemia via modulation of the nuclear factor-κB signaling pathway. Aging (Albany NY) 2021; 13:16165-16177. [PMID: 34114972 PMCID: PMC8266328 DOI: 10.18632/aging.203141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 04/29/2021] [Indexed: 11/25/2022]
Abstract
The occurrence of hypoxia-ischemia (HI) in the developing brain is closely associated with neuronal injury and even death. However, the underlying molecular mechanism is not fully understood. This study was designed to investigate phosphatase and tensin homolog (PTEN) nuclear translocation and its possible role in rat cortical neuronal damage following oxygen-glucose deprivation (OGD) in vitro. An in vitro OGD model was established using primary cortical neurons dissected from newborn Sprague-Dawley rats to mimic HI conditions. The PTENK13R mutant plasmid, which contains a lysine-to-arginine mutation at the lysine 13 residue, was constructed. The nuclei and cytoplasm of neurons were separated. Neuronal injury following OGD was evidenced by increased lactate dehydrogenase (LDH) release and apoptotic cell counts. In addition, PTEN expression was increased and the phosphorylation of extracellular signal-regulated kinase 1/2 (p-ERK1/2) and activation of nuclear factor kappa B (NF-κB) were decreased following OGD. PTENK13R transfection prevented PTEN nuclear translocation; attenuated the effect of OGD on nuclear p-ERK1/2 and NF-κB, apoptosis, and LDH release; and increased the expression of several anti-apoptotic proteins. We conclude that PTEN nuclear translocation plays an essential role in neuronal injury following OGD via modulation of the p-ERK1/2 and NF-κB pathways. Prevention of PTEN nuclear translocation might be a candidate strategy for preventing brain injury following HI.
Collapse
Affiliation(s)
- Jing Zhao
- Department of Neonatology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan, China
| | - Linlin Yin
- Department of Neonatology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan, China
| | - Lin Jiang
- Department of Neonatology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan, China
| | - Li Hou
- Department of Neonatology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan, China
| | - Ling He
- Department of Neonatology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan, China
| | - Chunyan Zhang
- Department of Neonatology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan, China
| |
Collapse
|
24
|
Zheng W, Wu F, Fu K, Sun G, Sun G, Li X, Jiang W, Cao H, Wang H, Tang W. Emerging Mechanisms and Treatment Progress on Liver Metastasis of Colorectal Cancer. Onco Targets Ther 2021; 14:3013-3036. [PMID: 33986602 PMCID: PMC8110277 DOI: 10.2147/ott.s301371] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Accepted: 03/24/2021] [Indexed: 12/24/2022] Open
Abstract
Colorectal cancer is currently the third largest malignant tumor in the world, with high new cases and high mortality. Metastasis is one of the most common causes of death of colorectal cancer, of which liver metastasis is the most fatal. Since the beginning of the Human Genome Project in 2001, people have gradually recognized the 3 billion base pairs that make up the human genome, of which only about 1.5% of the nucleic acid sequences are used for protein coding, including proto-oncogenes and tumor suppressor genes. A large number of differences in the expression of proto-oncogenes and tumor suppressor genes have also been found in the study of colorectal cancer, which proves that they are also actively involved in the progression of colorectal cancer and promote the occurrence of liver metastasis. Except for 1.5% of the coding sequence, the rest of the nucleic acid sequence does not encode any protein, which is called non-coding RNA. With the deepening of research, genome sequences without protein coding potential that were originally considered “junk sequences” may have important biological functions. Many years of studies have found that a large number of abnormal expression of ncRNA in colorectal cancer liver metastasis, indicating that ncRNA plays an important role in it. To explore the role and mechanism of these coding sequences and non-coding RNA in liver metastasis of colorectal cancer is very important for the early diagnosis and treatment of liver metastasis of colorectal cancer. This article reviews the coding genes and ncRNA that have been found in the study of liver metastasis of colorectal cancer in recent years, as well as the mechanisms that have been identified or are still under study, as well as the clinical treatment of liver metastasis of colorectal cancer.
Collapse
Affiliation(s)
- Wubin Zheng
- Department of General Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, People's Republic of China
| | - Fan Wu
- Department of General Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, People's Republic of China
| | - Kai Fu
- Department of General Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, People's Republic of China
| | - Guangshun Sun
- Department of General Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, People's Republic of China
| | - Guoqiang Sun
- Department of General Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, People's Republic of China
| | - Xiao Li
- Department of General Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, People's Republic of China
| | - Wei Jiang
- Department of General Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, People's Republic of China
| | - Hongyong Cao
- Department of General Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, People's Republic of China
| | - Hanjin Wang
- Department of General Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, People's Republic of China
| | - Weiwei Tang
- Hepatobiliary/Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Key Laboratory of Living Donor Transplantation, Chinese Academy of Medical Sciences, Nanjing, People's Republic of China
| |
Collapse
|
25
|
Akhlaghipour I, Bina AR, Abbaszadegan MR, Moghbeli M. Methylation as a critical epigenetic process during tumor progressions among Iranian population: an overview. Genes Environ 2021; 43:14. [PMID: 33883026 PMCID: PMC8059047 DOI: 10.1186/s41021-021-00187-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 04/07/2021] [Indexed: 11/10/2022] Open
Abstract
Cancer is one of the main health challenges and leading causes of deaths in the world. Various environmental and genetic risk factors are associated with tumorigenesis. Epigenetic deregulations are also important risk factors during tumor progression which are reversible transcriptional alterations without any genomic changes. Various mechanisms are involved in epigenetic regulations such as DNA methylation, chromatin modifications, and noncoding RNAs. Cancer incidence and mortality have a growing trend during last decades among Iranian population which are significantly related to the late diagnosis. Therefore, it is required to prepare efficient molecular diagnostic panels for the early detection of cancer in this population. Promoter hyper methylation is frequently observed as an inhibitory molecular mechanism in various genes associated with DNA repair, cell cycle regulation, and apoptosis during tumor progression. Since aberrant promoter methylations have critical roles in early stages of neoplastic transformations, in present review we have summarized all of the aberrant methylations which have been reported during tumor progression among Iranian cancer patients. Aberrant promoter methylations are targetable and prepare novel therapeutic options for the personalized medicine in cancer patients. This review paves the way to introduce a non-invasive methylation specific panel of diagnostic markers for the early detection of cancer among Iranians.
Collapse
Affiliation(s)
- Iman Akhlaghipour
- Student Research Committee, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Amir Reza Bina
- Student Research Committee, Faculty of Medicine, Birjand University of Medical Sciences, Birjand, Iran
| | | | - Meysam Moghbeli
- Department of Medical Genetics and Molecular Medicine, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
| |
Collapse
|
26
|
Chao JT, Roskelley CD, Loewen CJR. MAPS: machine-assisted phenotype scoring enables rapid functional assessment of genetic variants by high-content microscopy. BMC Bioinformatics 2021; 22:202. [PMID: 33879063 PMCID: PMC8056608 DOI: 10.1186/s12859-021-04117-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 04/02/2021] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Genetic testing is widely used in evaluating a patient's predisposition to hereditary diseases. In the case of cancer, when a functionally impactful mutation (i.e. genetic variant) is identified in a disease-relevant gene, the patient is at elevated risk of developing a lesion in their lifetime. Unfortunately, as the rate and coverage of genetic testing has accelerated, our ability to assess the functional status of new variants has fallen behind. Therefore, there is an urgent need for more practical, streamlined and cost-effective methods for classifying variants. RESULTS To directly address this issue, we designed a new approach that uses alterations in protein subcellular localization as a key indicator of loss of function. Thus, new variants can be rapidly functionalized using high-content microscopy (HCM). To facilitate the analysis of the large amounts of imaging data, we developed a new software toolkit, named MAPS for machine-assisted phenotype scoring, that utilizes deep learning to extract and classify cell-level features. MAPS helps users leverage cloud-based deep learning services that are easy to train and deploy to fit their specific experimental conditions. Model training is code-free and can be done with limited training images. Thus, MAPS allows cell biologists to easily incorporate deep learning into their image analysis pipeline. We demonstrated an effective variant functionalization workflow that integrates HCM and MAPS to assess missense variants of PTEN, a tumor suppressor that is frequently mutated in hereditary and somatic cancers. CONCLUSIONS This paper presents a new way to rapidly assess variant function using cloud deep learning. Since most tumor suppressors have well-defined subcellular localizations, our approach could be widely applied to functionalize variants of uncertain significance and help improve the utility of genetic testing.
Collapse
Affiliation(s)
- Jesse T Chao
- Department of Cellular and Physiological Sciences, Life Sciences Institute, University of British Columbia, Vancouver, V6T1Z3, Canada.
| | - Calvin D Roskelley
- Department of Cellular and Physiological Sciences, Life Sciences Institute, University of British Columbia, Vancouver, V6T1Z3, Canada
| | - Christopher J R Loewen
- Department of Cellular and Physiological Sciences, Life Sciences Institute, University of British Columbia, Vancouver, V6T1Z3, Canada
| |
Collapse
|
27
|
Mutation-specific non-canonical pathway of PTEN as a distinct therapeutic target for glioblastoma. Cell Death Dis 2021; 12:374. [PMID: 33828082 PMCID: PMC8027895 DOI: 10.1038/s41419-021-03657-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 03/20/2021] [Accepted: 03/22/2021] [Indexed: 01/02/2023]
Abstract
PTEN is one of the most frequently altered tumor suppressor genes in malignant tumors. The dominant-negative effect of PTEN alteration suggests that the aberrant function of PTEN mutation might be more disastrous than deletion, the most frequent genomic event in glioblastoma (GBM). This study aimed to understand the functional properties of various PTEN missense mutations and to investigate their clinical relevance. The genomic landscape of PTEN alteration was analyzed using the Samsung Medical Center GBM cohort and validated via The Cancer Genome Atlas dataset. Several hotspot mutations were identified, and their subcellular distributions and phenotypes were evaluated. We established a library of cancer cell lines that overexpress these mutant proteins using the U87MG and patient-derived cell models lacking functional PTEN. PTEN mutations were categorized into two major subsets: missense mutations in the phosphatase domain and truncal mutations in the C2 domain. We determined the subcellular compartmentalization of four mutant proteins (H93Y, C124S, R130Q, and R173C) from the former group and found that they had distinct localizations; those associated with invasive phenotypes ('edge mutations') localized to the cell periphery, while the R173C mutant localized to the nucleus. Invasive phenotypes derived from edge substitutions were unaffected by an anti-PI3K/Akt agent but were disrupted by microtubule inhibitors. PTEN mutations exhibit distinct functional properties regarding their subcellular localization. Further, some missense mutations ('edge mutations') in the phosphatase domain caused enhanced invasiveness associated with dysfunctional cytoskeletal assembly, thus suggesting it to be a potent therapeutic target.
Collapse
|
28
|
Zhang Q, Liang H, Zhao X, Zheng L, Li Y, Gong J, Zhu Y, Jin Y, Yin Y. PTENε suppresses tumor metastasis through regulation of filopodia formation. EMBO J 2021; 40:e105806. [PMID: 33755220 PMCID: PMC8126949 DOI: 10.15252/embj.2020105806] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 01/03/2021] [Accepted: 02/01/2021] [Indexed: 01/16/2023] Open
Abstract
PTEN is one of the most frequently mutated genes in malignancies and acts as a powerful tumor suppressor. Tumorigenesis is involved in multiple and complex processes including initiation, invasion, and metastasis. The complexity of PTEN function is partially attributed to PTEN family members such as PTENα and PTENβ. Here, we report the identification of PTENε (also named as PTEN5), a novel N‐terminal‐extended PTEN isoform that suppresses tumor invasion and metastasis. We show that the translation of PTENε/PTEN5 is initiated from the CUG816 codon within the 5′UTR region of PTEN mRNA. PTENε/PTEN5 mainly localizes in the cell membrane and physically associates with and dephosphorylates VASP and ACTR2, which govern filopodia formation and cell motility. We found that endogenous depletion of PTENε/PTEN5 promotes filopodia formation and enhances the metastasis capacity of tumor cells. Overall, we identify a new isoform of PTEN with distinct subcellular localization and molecular function compared to the known members of the PTEN family. These findings advance our current understanding of the importance and diversity of PTEN functions.
Collapse
Affiliation(s)
- Qiaoling Zhang
- Department of Pathology, School of Basic Medical Sciences, Institute of Systems Biomedicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing, China
| | - Hui Liang
- Department of Pathology, School of Basic Medical Sciences, Institute of Systems Biomedicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing, China
| | - Xuyang Zhao
- Department of Pathology, School of Basic Medical Sciences, Institute of Systems Biomedicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing, China
| | - Lin Zheng
- Department of Pathology, School of Basic Medical Sciences, Institute of Systems Biomedicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing, China
| | - Yunqiao Li
- Department of Pathology, School of Basic Medical Sciences, Institute of Systems Biomedicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing, China
| | - Jingjing Gong
- Department of Pathology, School of Basic Medical Sciences, Institute of Systems Biomedicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing, China
| | - Yizhang Zhu
- Department of Pathology, School of Basic Medical Sciences, Institute of Systems Biomedicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing, China
| | - Yan Jin
- Department of Pathology, School of Basic Medical Sciences, Institute of Systems Biomedicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing, China
| | - Yuxin Yin
- Department of Pathology, School of Basic Medical Sciences, Institute of Systems Biomedicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing, China.,Institute of Precision Medicine, Peking University Shenzhen Hospital, Shenzhen, China
| |
Collapse
|
29
|
Li Q, Li H, Liang J, Mei J, Cao Z, Zhang L, Luo J, Tang Y, Huang R, Xia H, Zhang Q, Xiang Q, Yang Y, Huang Y. Sertoli cell-derived exosomal MicroRNA-486-5p regulates differentiation of spermatogonial stem cell through PTEN in mice. J Cell Mol Med 2021; 25:3950-3962. [PMID: 33608983 PMCID: PMC8051706 DOI: 10.1111/jcmm.16347] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 11/24/2020] [Accepted: 01/12/2021] [Indexed: 12/14/2022] Open
Abstract
Self‐renewal and differentiation of spermatogonial stem cell (SSC) are critical for male fertility and reproduction, both of which are highly regulated by testicular microenvironment. Exosomal miRNAs have emerged as new components in intercellular communication. However, their roles in the differentiation of SSC remain unclear. Here, we observed miR‐486‐5p enriched in Sertoli cell and Sertoli cell‐derived exosomes. The exosomes mediate the transfer of miR‐486‐5p from Sertoli cells to SSCs. Exosomes release miR‐486‐5p, thus up‐regulate expression of Stra8 (stimulated by retinoic acid 8) and promote differentiation of SSC. And PTEN was identified as a target of miR‐486‐5p. Overexpression of miR‐486‐5p in SSCs down‐regulates PTEN expression, which up‐regulates the expression of STRA8 and SYCP3, promotes SSCs differentiation. In addition, blocking the exosome‐mediated transfer of miR‐486‐5p inhibits differentiation of SSC. Our findings demonstrate that miR‐486‐5p acts as a communication molecule between Sertoli cells and SSCs in modulating differentiation of SSCs. This provides a new insight on molecular mechanisms that regulates SSC differentiation and a basis for the diagnosis, treatment, and prevention of male infertility.
Collapse
Affiliation(s)
- Quan Li
- Department of Cell Biology & Guangdong Provincial Key Laboratory of Bioengineering Medicine, Jinan University, Guangzhou, China
| | - Hanhao Li
- Department of Pharmacology, Jinan University, Guangzhou, China
| | - Jinlian Liang
- Department of Cell Biology & Guangdong Provincial Key Laboratory of Bioengineering Medicine, Jinan University, Guangzhou, China
| | - Jiaxin Mei
- Department of Cell Biology & Guangdong Provincial Key Laboratory of Bioengineering Medicine, Jinan University, Guangzhou, China
| | - Zhen Cao
- Department of Cell Biology & Guangdong Provincial Key Laboratory of Bioengineering Medicine, Jinan University, Guangzhou, China
| | - Lei Zhang
- Guangdong Provincial Institute of Biological Products and Materia Medica, Guangzhou, China
| | - Jiao Luo
- Institute for Translational Medicine, Shenzhen Second People's Hospital / The First Affiliated Hospital of Shenzhen University Health Science Center, Shenzhen, China
| | - Yan Tang
- Department of Cell Biology & Guangdong Provincial Key Laboratory of Bioengineering Medicine, Jinan University, Guangzhou, China
| | - Rufei Huang
- Department of Pharmacology, Jinan University, Guangzhou, China
| | - Huan Xia
- Department of Cell Biology & Guangdong Provincial Key Laboratory of Bioengineering Medicine, Jinan University, Guangzhou, China
| | - Qihao Zhang
- Department of Cell Biology & Guangdong Provincial Key Laboratory of Bioengineering Medicine, Jinan University, Guangzhou, China.,Guangdong Provincial Biotechnology Drug & Engineering Technology Research Center, Guangzhou, China
| | - Qi Xiang
- Department of Cell Biology & Guangdong Provincial Key Laboratory of Bioengineering Medicine, Jinan University, Guangzhou, China.,Biopharmaceutical Research & Development Center of Jinan University, Guangzhou, China
| | - Yan Yang
- Department of Cell Biology & Guangdong Provincial Key Laboratory of Bioengineering Medicine, Jinan University, Guangzhou, China.,Guangdong Provincial Biotechnology Drug & Engineering Technology Research Center, Guangzhou, China
| | - Yadong Huang
- Department of Cell Biology & Guangdong Provincial Key Laboratory of Bioengineering Medicine, Jinan University, Guangzhou, China.,Department of Pharmacology, Jinan University, Guangzhou, China.,Guangdong Provincial Biotechnology Drug & Engineering Technology Research Center, Guangzhou, China
| |
Collapse
|
30
|
Bae M, Roh JD, Kim Y, Kim SS, Han HM, Yang E, Kang H, Lee S, Kim JY, Kang R, Jung H, Yoo T, Kim H, Kim D, Oh H, Han S, Kim D, Han J, Bae YC, Kim H, Ahn S, Chan AM, Lee D, Kim JW, Kim E. SLC6A20 transporter: a novel regulator of brain glycine homeostasis and NMDAR function. EMBO Mol Med 2021; 13:e12632. [PMID: 33428810 PMCID: PMC7863395 DOI: 10.15252/emmm.202012632] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 10/22/2020] [Accepted: 11/19/2020] [Indexed: 12/25/2022] Open
Abstract
Glycine transporters (GlyT1 and GlyT2) that regulate levels of brain glycine, an inhibitory neurotransmitter with co‐agonist activity for NMDA receptors (NMDARs), have been considered to be important targets for the treatment of brain disorders with suppressed NMDAR function such as schizophrenia. However, it remains unclear whether other amino acid transporters expressed in the brain can also regulate brain glycine levels and NMDAR function. Here, we report that SLC6A20A, an amino acid transporter known to transport proline based on in vitro data but is understudied in the brain, regulates proline and glycine levels and NMDAR function in the mouse brain. SLC6A20A transcript and protein levels were abnormally increased in mice carrying a mutant PTEN protein lacking the C terminus through enhanced β‐catenin binding to the Slc6a20a gene. These mice displayed reduced extracellular levels of brain proline and glycine and decreased NMDAR currents. Elevating glycine levels back to normal ranges by antisense oligonucleotide‐induced SLC6A20 knockdown, or the competitive GlyT1 antagonist sarcosine, normalized NMDAR currents and repetitive climbing behavior observed in these mice. Conversely, mice lacking SLC6A20A displayed increased extracellular glycine levels and NMDAR currents. Lastly, both mouse and human SLC6A20 proteins mediated proline and glycine transports, and SLC6A20 proteins could be detected in human neurons. These results suggest that SLC6A20 regulates proline and glycine homeostasis in the brain and that SLC6A20 inhibition has therapeutic potential for brain disorders involving NMDAR hypofunction.
Collapse
Affiliation(s)
- Mihyun Bae
- Center for Synaptic Brain Dysfunctions, Institute for Basic Science (IBS), Daejeon, Korea
| | - Junyeop Daniel Roh
- Department of Biological Sciences, Korea Advanced Institute for Science and Technology (KAIST), Daejeon, Korea
| | - Youjoung Kim
- Department of Biological Sciences, Korea Advanced Institute for Science and Technology (KAIST), Daejeon, Korea
| | - Seong Soon Kim
- Therapeutics and Biotechnology Division, Korea Research Institute of Chemical Technology (KRICT), Daejeon, Korea
| | - Hye Min Han
- Department of Anatomy and Neurobiology, School of Dentistry, Kyungpook National University, Daegu, Korea
| | - Esther Yang
- Department of Anatomy and Division of Brain Korea 21, Biomedical Science, College of Medicine, Korea University, Seoul, Korea
| | - Hyojin Kang
- Division of National Supercomputing, KISTI, Daejeon, Korea
| | - Suho Lee
- Center for Synaptic Brain Dysfunctions, Institute for Basic Science (IBS), Daejeon, Korea
| | - Jin Yong Kim
- Department of Anatomy and Division of Brain Korea 21, Biomedical Science, College of Medicine, Korea University, Seoul, Korea
| | - Ryeonghwa Kang
- Department of Biological Sciences, Korea Advanced Institute for Science and Technology (KAIST), Daejeon, Korea
| | - Hwajin Jung
- Center for Synaptic Brain Dysfunctions, Institute for Basic Science (IBS), Daejeon, Korea
| | - Taesun Yoo
- Center for Synaptic Brain Dysfunctions, Institute for Basic Science (IBS), Daejeon, Korea
| | - Hyosang Kim
- Department of Biological Sciences, Korea Advanced Institute for Science and Technology (KAIST), Daejeon, Korea
| | - Doyoun Kim
- Center for Synaptic Brain Dysfunctions, Institute for Basic Science (IBS), Daejeon, Korea
| | - Heejeong Oh
- Department of Biological Sciences, Korea Advanced Institute for Science and Technology (KAIST), Daejeon, Korea
| | - Sungwook Han
- Department of Biological Sciences, Korea Advanced Institute for Science and Technology (KAIST), Daejeon, Korea
| | - Dayeon Kim
- Graduate School of Medical Science and Engineering, KAIST, Daejeon, Korea
| | - Jinju Han
- Graduate School of Medical Science and Engineering, KAIST, Daejeon, Korea
| | - Yong Chul Bae
- Department of Anatomy and Neurobiology, School of Dentistry, Kyungpook National University, Daegu, Korea
| | - Hyun Kim
- Department of Anatomy and Division of Brain Korea 21, Biomedical Science, College of Medicine, Korea University, Seoul, Korea
| | - Sunjoo Ahn
- Therapeutics and Biotechnology Division, Korea Research Institute of Chemical Technology (KRICT), Daejeon, Korea
| | - Andrew M Chan
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
| | - Daeyoup Lee
- Department of Biological Sciences, Korea Advanced Institute for Science and Technology (KAIST), Daejeon, Korea
| | - Jin Woo Kim
- Department of Biological Sciences, Korea Advanced Institute for Science and Technology (KAIST), Daejeon, Korea
| | - Eunjoon Kim
- Center for Synaptic Brain Dysfunctions, Institute for Basic Science (IBS), Daejeon, Korea.,Department of Biological Sciences, Korea Advanced Institute for Science and Technology (KAIST), Daejeon, Korea
| |
Collapse
|
31
|
Tyrosine Kinase Receptors in Oncology. Int J Mol Sci 2020; 21:ijms21228529. [PMID: 33198314 PMCID: PMC7696731 DOI: 10.3390/ijms21228529] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 11/07/2020] [Accepted: 11/09/2020] [Indexed: 02/07/2023] Open
Abstract
Tyrosine kinase receptors (TKR) comprise more than 60 molecules that play an essential role in the molecular pathways, leading to cell survival and differentiation. Consequently, genetic alterations of TKRs may lead to tumorigenesis and, therefore, cancer development. The discovery and improvement of tyrosine kinase inhibitors (TKI) against TKRs have entailed an important step in the knowledge-expansion of tumor physiopathology as well as an improvement in the cancer treatment based on molecular alterations over many tumor types. The purpose of this review is to provide a comprehensive review of the different families of TKRs and their role in the expansion of tumor cells and how TKIs can stop these pathways to tumorigenesis, in combination or not with other therapies. The increasing growth of this landscape is driving us to strengthen the development of precision oncology with clinical trials based on molecular-based therapy over a histology-based one, with promising preliminary results.
Collapse
|
32
|
Kato T, Yamada T, Nakamura H, Igarashi A, Anders RA, Sesaki H, Iijima M. The Loss of Nuclear PTEN Increases Tumorigenesis in a Preclinical Mouse Model for Hepatocellular Carcinoma. iScience 2020; 23:101548. [PMID: 33083717 PMCID: PMC7516300 DOI: 10.1016/j.isci.2020.101548] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 06/16/2020] [Accepted: 09/07/2020] [Indexed: 02/07/2023] Open
Abstract
The PTEN gene is highly mutated in many cancers, including hepatocellular carcinoma. The PTEN protein is located at different subcellular regions-PTEN at the plasma membrane suppresses PI3-kinase signaling in cell growth, whereas PTEN in the nucleus maintains genome integrity. Here, using nuclear PTEN-deficient mice, we analyzed the role of PTEN in the nucleus in hepatocellular carcinoma that is induced by carcinogen and oxidative stress-producing hepatotoxin. Upon oxidative stress, PTEN was accumulated in the nucleus of the liver, and this accumulation promoted repair of DNA damage in wild-type mice. In contrast, nuclear PTEN-deficient mice had increased DNA damage and accelerated hepatocellular carcinoma formation. Both basal and oxidative stress-induced localization of PTEN in the nucleus require ubiquitination of lysine 13 in PTEN. Taken together, these data suggest the critical role of nuclear PTEN in the protection from DNA damage and tumorigenesis in vivo.
Collapse
Affiliation(s)
- Takashi Kato
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Tatsuya Yamada
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Hideki Nakamura
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Atsushi Igarashi
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Robert A. Anders
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Hiromi Sesaki
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Miho Iijima
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Corresponding author
| |
Collapse
|
33
|
Xia Q, Ali S, Liu L, Li Y, Liu X, Zhang L, Dong L. Role of Ubiquitination in PTEN Cellular Homeostasis and Its Implications in GB Drug Resistance. Front Oncol 2020; 10:1569. [PMID: 32984016 PMCID: PMC7492558 DOI: 10.3389/fonc.2020.01569] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 07/21/2020] [Indexed: 12/15/2022] Open
Abstract
Glioblastoma (GB) is the most common and aggressive brain malignancy, characterized by heterogeneity and drug resistance. PTEN, a crucial tumor suppressor, exhibits phosphatase-dependent (PI3K-AKT-mTOR pathway)/independent (nucleus stability) activities to maintain the homeostatic regulation of numerous physiological processes. Premature and absolute loss of PTEN activity usually tends to cellular senescence. However, monoallelic loss of PTEN is frequently observed at tumor inception, and absolute loss of PTEN activity also occurs at the late stage of gliomagenesis. Consequently, aberrant PTEN homeostasis, mainly regulated at the post-translational level, renders cells susceptible to tumorigenesis and drug resistance. Ubiquitination-mediated degradation or deregulated intracellular localization of PTEN hijacks cell growth rheostat control for neoplastic remodeling. Functional inactivation of PTEN mediated by the overexpression of ubiquitin ligases (E3s) renders GB cells adaptive to PTEN loss, which confers resistance to EGFR tyrosine kinase inhibitors and immunotherapies. In this review, we discuss how glioma cells develop oncogenic addiction to the E3s-PTEN axis, promoting their growth and proliferation. Antitumor strategies involving PTEN-targeting E3 ligase inhibitors can restore the tumor-suppressive environment. E3 inhibitors collectively reactivate PTEN and may represent next-generation treatment against deadly malignancies such as GB.
Collapse
Affiliation(s)
- Qin Xia
- School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | - Sakhawat Ali
- School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | - Liqun Liu
- School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | - Yang Li
- School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | - Xuefeng Liu
- School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, China
| | - Lingqiang Zhang
- State Key Laboratory of Proteomics, National Center for Protein Sciences, Beijing Institute of Lifeomics, Beijing, China
| | - Lei Dong
- School of Life Sciences, Beijing Institute of Technology, Beijing, China
| |
Collapse
|
34
|
Yeung YT, Fan S, Lu B, Yin S, Yang S, Nie W, Wang M, Zhou L, Li T, Li X, Bode AM, Dong Z. CELF2 suppresses non-small cell lung carcinoma growth by inhibiting the PREX2-PTEN interaction. Carcinogenesis 2020; 41:377-389. [PMID: 31241130 DOI: 10.1093/carcin/bgz113] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 06/03/2019] [Accepted: 06/20/2019] [Indexed: 12/31/2022] Open
Abstract
The phosphoinositide 3-kinase (PI3-K)/Akt signaling pathway is important in the regulation of cell proliferation through its production of phosphatidylinositol 3,4,5-triphosphate (PIP3). Activation of this pathway is frequently observed in human cancers, including non-small cell lung carcinoma. The PI3-K/Akt pathway is negatively regulated by the dual-specificity phosphatase and tensin homolog (PTEN) protein. PTEN acts as a direct antagonist of PI3-K by dephosphorylating PIP3. Studies have shown that PTEN phosphatase activity is inhibited by PREX2, a guanine nucleotide exchanger factor (GEF). Multiple studies revealed that CELF2, an RNA binding protein, cooperates synergistically with PTEN as a tumor suppressor in multiple cancers. However, the underlying mechanism as to how CELF2 enhances PTEN activity remains unclear. Here, we report that CELF2 interacts with PREX2 and reduces the association of PREX2 with PTEN. Consistent with this observation, PTEN phosphatase activity is upregulated with CELF2 overexpression. In addition, overexpression of CELF2 represses both Akt phosphorylation and cell proliferation only in the presence of PTEN. In an ex vivo study, CELF2 gene delivery could significantly inhibit patient-derived xenografts (PDX) tumor growth. To further investigate the clinical relevance of this finding, we analyzed 87 paired clinical lung adenocarcinoma samples and the results showed that CELF2 protein expression is downregulated in tumor tissues and associated with poor prognosis. The CELF2 gene is located on the chromosome 10p arm, a region frequently lost in human cancers, including breast invasive carcinoma, low-grade glioma and glioblastoma. Analysis of TCGA datasets showed that CELF2 expression is also associated with shorter patient survival time in all these cancers. Overall, our work suggests that CELF2 plays a novel role in PI3-K signaling by antagonizing the oncogenic effect of PREX2.
Collapse
Affiliation(s)
- Yiu To Yeung
- The China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, China.,The Hormel Institute, University of Minnesota, Austin, MN, USA
| | - Suyu Fan
- The China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, China
| | - Bingbing Lu
- The China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, China.,Pathophysiology Department, Basic Medical College, Zhengzhou University, Zhengzhou, Henan, China
| | - Shuying Yin
- The China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, China.,Pathophysiology Department, Basic Medical College, Zhengzhou University, Zhengzhou, Henan, China
| | - Sen Yang
- The China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, China
| | - Wenna Nie
- The China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, China
| | - Meixian Wang
- The China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, China
| | - Liting Zhou
- The China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, China
| | - Tiepeng Li
- Department of Immunotherapy, The Affiliated Cancer Hospital, Zhengzhou University, Zhengzhou, Henan, China
| | - Xiang Li
- The China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, China.,Pathophysiology Department, Basic Medical College, Zhengzhou University, Zhengzhou, Henan, China.,Collaborative Innovation Center of Cancer Chemoprevention of Henan, Zhengzhou, Henan, China
| | - Ann M Bode
- The Hormel Institute, University of Minnesota, Austin, MN, USA
| | - Zigang Dong
- The China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, China.,The Hormel Institute, University of Minnesota, Austin, MN, USA.,Pathophysiology Department, Basic Medical College, Zhengzhou University, Zhengzhou, Henan, China.,Department of Immunotherapy, The Affiliated Cancer Hospital, Zhengzhou University, Zhengzhou, Henan, China.,Collaborative Innovation Center of Cancer Chemoprevention of Henan, Zhengzhou, Henan, China
| |
Collapse
|
35
|
Jaini R, Loya MG, King AT, Thacker S, Sarn NB, Yu Q, Stark GR, Eng C. Germline PTEN mutations are associated with a skewed peripheral immune repertoire in humans and mice. Hum Mol Genet 2020; 29:2353-2364. [PMID: 32588888 PMCID: PMC7424751 DOI: 10.1093/hmg/ddaa118] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 05/08/2020] [Accepted: 06/11/2020] [Indexed: 12/11/2022] Open
Abstract
Individuals with germline mutations in the gene encoding phosphatase and tensin homolog on chromosome ten (PTEN) are diagnosed with PTEN hamartoma tumor syndrome (PHTS) and are at high risk for developing breast, thyroid and other cancers and/or autoimmunity or neurodevelopmental issues including autism spectrum disorders. Although well recognized as a tumor suppressor, involvement of PTEN mutations in mediating such a diverse range of phenotypes indicates a more central involvement for PTEN in immunity than previously recognized. To address this, sequencing of the T-cell receptor variable-region β-chain was performed on peripheral blood from PHTS patients. Based on patient findings, we performed mechanistic studies in two Pten knock-in murine models, distinct from each other in cell compartment-specific predominance of Pten. We found that PTEN mutations in humans and mice are associated with a skewed T- and B-cell gene repertoire, characterized by increased prevalence of high-frequency clones. Immunological characterization showed that Pten mutants have increased B-cell proliferation and a proclivity towards increased T-cell reactivity upon Toll-like-receptor stimulation. Furthermore, decreases in nuclear but not cytoplasmic Pten levels associated with a reduction in expression of the autoimmune regulator (Aire), a critical mediator of central immune tolerance. Mechanistically, we show that nuclear PTEN most likely regulates Aire expression via its emerging role in splicing regulation. We conclude that germline disruption of PTEN, both in human and mouse, results in compromised central immune tolerance processes that may significantly impact individual stress responses and therefore predisposition to autoimmunity and cancer.
Collapse
MESH Headings
- Animals
- B-Lymphocytes/immunology
- B-Lymphocytes/pathology
- Cell Proliferation/genetics
- Disease Models, Animal
- Female
- Gene Knock-In Techniques
- Germ-Line Mutation/genetics
- Hamartoma Syndrome, Multiple/blood
- Hamartoma Syndrome, Multiple/genetics
- Hamartoma Syndrome, Multiple/immunology
- Hamartoma Syndrome, Multiple/pathology
- Humans
- Immune Tolerance/genetics
- Male
- Mice
- PTEN Phosphohydrolase/genetics
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- Receptors, Antigen, T-Cell, alpha-beta/immunology
- T-Lymphocytes/immunology
- T-Lymphocytes/pathology
- Toll-Like Receptors/genetics
- Toll-Like Receptors/immunology
- Transcription Factors/genetics
- AIRE Protein
Collapse
Affiliation(s)
- Ritika Jaini
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
- Germline High Risk Focus Group, CASE Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
| | - Matthew G Loya
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Alexander T King
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Stetson Thacker
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Nicholas B Sarn
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
- Department of Genetics and Genome Sciences, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
| | - Qi Yu
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - George R Stark
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
- Department of Genetics and Genome Sciences, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
| | - Charis Eng
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
- Department of Genetics and Genome Sciences, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
- Germline High Risk Focus Group, CASE Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
| |
Collapse
|
36
|
Ho J, Cruise ES, Dowling RJO, Stambolic V. PTEN Nuclear Functions. Cold Spring Harb Perspect Med 2020; 10:cshperspect.a036079. [PMID: 31712221 DOI: 10.1101/cshperspect.a036079] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
For years, clinical and basic researchers have been aware of the presence of PTEN in the nucleus in cell culture, animal models, and both healthy and diseased human tissues. Despite the early recognition of nuclear PTEN, the understanding of the mechanisms of its nuclear localization, function in the nucleus, and importance in biology and human disease has been lacking. Over the last decade, emerging concepts for the complex involvement of nuclear PTEN in a variety of processes, including genome maintenance and DNA repair, cell-cycle control, gene expression, and DNA replication, are illuminating what could prove to be the key path toward a full understanding of PTEN function in health and disease. Dysregulation of nuclear PTEN is now considered an important aspect of the etiology of many pathologic conditions, prompting reconsideration of the therapeutic approaches aimed at countering the consequences of PTEN deficiency. This new knowledge is fueling the development of innovative therapeutic modalities for a broad spectrum of human conditions, from cancer and metabolic diseases, to neurological disorders and autism.
Collapse
Affiliation(s)
- Jason Ho
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada
| | - Edward S Cruise
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Ryan J O Dowling
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Vuk Stambolic
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| |
Collapse
|
37
|
Haddadi N, Travis G, Nassif NT, Simpson AM, Marsh DJ. Toward Systems Pathology for PTEN Diagnostics. Cold Spring Harb Perspect Med 2020; 10:cshperspect.a037127. [PMID: 31615872 DOI: 10.1101/cshperspect.a037127] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Germline alterations of the tumor suppressor PTEN have been extensively characterized in patients with PTEN hamartoma tumor syndromes, encompassing subsets of Cowden syndrome, Bannayan-Riley-Ruvalcaba syndrome, Proteus and Proteus-like syndromes, as well as autism spectrum disorder. Studies have shown an increase in the risk of developing specific cancer types in the presence of a germline PTEN mutation. Furthermore, outside of the familial setting, somatic variants of PTEN occur in numerous malignancies. Here we introduce and discuss the prospect of moving toward a systems pathology approach for PTEN diagnostics, incorporating clinical and molecular pathology data with the goal of improving the clinical management of patients with a PTEN mutation. Detection of a germline PTEN mutation can inform cancer surveillance and in the case of somatic mutation, have value in predicting disease course. Given that PTEN functions in the PI3K/AKT/mTOR pathway, identification of a PTEN mutation may highlight new therapeutic opportunities and/or inform therapeutic choices.
Collapse
Affiliation(s)
- Nahal Haddadi
- School of Life Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
| | - Glena Travis
- School of Life Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
| | - Najah T Nassif
- School of Life Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia.,Centre for Health Technologies, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
| | - Ann M Simpson
- School of Life Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia.,Centre for Health Technologies, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
| | - Deborah J Marsh
- School of Life Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia.,Centre for Health Technologies, University of Technology Sydney, Ultimo, New South Wales 2007, Australia.,Translational Oncology Group, School of Life Sciences, Faculty of Science, University of Technology Sydney, Ultimo, New South Wales 2007, Australia.,Northern Clinical School, Kolling Institute, Faculty of Medicine and Health, University of Sydney, New South Wales 2006, Australia
| |
Collapse
|
38
|
Samet JM, Chen H, Pennington ER, Bromberg PA. Non-redox cycling mechanisms of oxidative stress induced by PM metals. Free Radic Biol Med 2020; 151:26-37. [PMID: 31877355 PMCID: PMC7803379 DOI: 10.1016/j.freeradbiomed.2019.12.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 12/13/2019] [Accepted: 12/20/2019] [Indexed: 12/27/2022]
Abstract
Metallic compounds contribute to the oxidative stress of ambient particulate matter (PM) exposure. The toxicity of redox inert ions of cadmium, mercury, lead and zinc, as well as redox-active ions of vanadium and chromium is underlain by dysregulation of mitochondrial function and loss of signaling quiescence. Central to the initiation of these effects is the interaction of metal ions with cysteinyl thiols on glutathione and key regulatory proteins, which leads to impaired mitochondrial electron transport and persistent pan-activation of signal transduction pathways. The mitochondrial and signaling effects are linked by the production of H2O2, generated from mitochondrial superoxide anion or through the activation of NADPH oxidase, which extends the range and amplifies the magnitude of the oxidative effects of the metals. This oxidative burden can be further potentiated by inhibitory effects of the metals on the enzymes of the glutathione and thioredoxin systems. Along with the better-known Fenton-based mechanisms, the non-redox cycling mechanisms of oxidative stress induced by metals constitute significant pathways for cellular injury induced by PM inhalation.
Collapse
Affiliation(s)
- James M Samet
- Environmental Public Health Division, Center for Public Health and Environmental Assessment, U.S. Environmental Protection Agency, Chapel Hill, NC, USA.
| | - Hao Chen
- Oak Ridge Institute for Science and Education, Oak Ridge, TN, USA
| | | | - Philip A Bromberg
- Center for Environmental Medicine, Asthma and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| |
Collapse
|
39
|
Abbas A, Padmanabhan R, Romigh T, Eng C. PTEN modulates gene transcription by redistributing genome-wide RNA polymerase II occupancy. Hum Mol Genet 2020; 28:2826-2834. [PMID: 31127935 PMCID: PMC6735678 DOI: 10.1093/hmg/ddz112] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 04/27/2019] [Accepted: 05/20/2019] [Indexed: 12/13/2022] Open
Abstract
Control of gene expression is one of the most complex yet continuous physiological processes impacting cellular homeostasis. RNA polymerase II (Pol II) transcription is tightly regulated at promoter-proximal regions by intricate dynamic processes including Pol II pausing, release into elongation and premature termination. Pol II pausing is a phenomenon where Pol II complex pauses within 30–60 nucleotides after initiating the transcription. Negative elongation factor (NELF) and DRB sensitivity inducing factor (DSIF) contribute in the establishment of Pol II pausing, and positive transcription elongation factor b releases (P-TEFb) paused complex after phosphorylating DSIF that leads to dissociation of NELF. Pol II pausing is observed in most expressed genes across the metazoan. The precise role of Pol II pausing is not well understood; however, it’s required for integration of signals for gene regulation. In the present study, we investigated the role of phosphatase and tensin homolog (PTEN) in genome-wide transcriptional regulation using PTEN overexpression and PTEN knock-down models. Here we identify that PTEN alters the expression of hundreds of genes, and its restoration establishes genome-wide Pol II promoter-proximal pausing in PTEN null cells. Furthermore, PTEN re-distributes Pol II occupancy across the genome and possibly impacts Pol II pause duration, release and elongation rate in order to enable precise gene regulation at the genome-wide scale. Our observations demonstrate an imperative role of PTEN in global transcriptional regulation that will provide a new direction to understand PTEN-associated pathologies and its management.
Collapse
Affiliation(s)
- Ata Abbas
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Roshan Padmanabhan
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Todd Romigh
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Charis Eng
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA.,Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH, USA.,Department of Genetics and Genome Sciences, Case Western Reserve University School of Medicine, Cleveland, OH, USA.,Germline High Risk Focus Group, Case Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, OH, USA
| |
Collapse
|
40
|
Wang J, Ren D, Sun Y, Xu C, Wang C, Cheng R, Wang L, Jia G, Ren J, Ma J, Tu Y, Ji H. Inhibition of PLK4 might enhance the anti-tumour effect of bortezomib on glioblastoma via PTEN/PI3K/AKT/mTOR signalling pathway. J Cell Mol Med 2020; 24:3931-3947. [PMID: 32126150 PMCID: PMC7171416 DOI: 10.1111/jcmm.14996] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 10/26/2019] [Accepted: 11/23/2019] [Indexed: 12/20/2022] Open
Abstract
Glioblastoma (GBM) is one of the most common aggressive cancers of the central nervous system in adults with a high mortality rate. Bortezomib is a boronic acid-based potent proteasome inhibitor that has been actively studied for its anti-tumour effects through inhibition of the proteasome. The proteasome is a key component of the ubiquitin-proteasome pathway that is critical for protein homeostasis, regulation of cellular growth, and apoptosis. Overexpression of polo-like kinase 4 (PLK4) is commonly reported in tumour cells and increases their invasive and metastatic abilities. In this study, we established a cell model of PLK4 knockdown and overexpression in LN-18, A172 and LN-229 cells and found that knockdown of PLK4 expression enhanced the anti-tumour effect of bortezomib. We further found that this effect may be mediated by the PTEN/PI3K/AKT/mTOR signalling pathway and that the apoptotic and oxidative stress processes were activated, while the expression of matrix metalloproteinases (MMPs) was down-regulated. Similar phenomenon was observed using in vitro experiments. Thus, we speculate that PLK4 inhibition may be a new therapeutic strategy for GBM.
Collapse
Affiliation(s)
- Jing Wang
- Department of neurosurgery, Shanxi academy of medical science, Shanxi Bethune Hospital, Taiyuan, China
| | - Dengpeng Ren
- Department of neurosurgery, Central Hospital of Yuncheng city, Yuncheng, China
| | - Yan Sun
- Neurological intensive care unit, Special medical center of PAP, Tianjin, China
| | - Chao Xu
- Neurological intensive care unit, Special medical center of PAP, Tianjin, China
| | - Chunhong Wang
- Department of neurosurgery, Shanxi people's hospital, Taiyuan, China
| | - Rui Cheng
- Department of neurosurgery, Shanxi people's hospital, Taiyuan, China
| | - Lina Wang
- Neurological intensive care unit, Special medical center of PAP, Tianjin, China
| | - Guijun Jia
- Department of neurosurgery, Shanxi people's hospital, Taiyuan, China
| | - Jinrui Ren
- Department of neurosurgery, Shanxi people's hospital, Taiyuan, China
| | - Jiuhong Ma
- Department of neurosurgery, Shanxi people's hospital, Taiyuan, China
| | - Yue Tu
- Neurological intensive care unit, Special medical center of PAP, Tianjin, China
| | - Hongming Ji
- Department of neurosurgery, Shanxi people's hospital, Taiyuan, China
| |
Collapse
|
41
|
Validating a targeted next-generation sequencing assay and profiling somatic variants in Chinese non-small cell lung cancer patients. Sci Rep 2020; 10:2070. [PMID: 32034196 PMCID: PMC7005734 DOI: 10.1038/s41598-020-58819-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 11/29/2019] [Indexed: 02/05/2023] Open
Abstract
Non-small cell lung cancer (NSCLC) is featured with complex genomic alterations. Molecular profiling of large cohort of NSCLC patients is thus a prerequisite for precision medicine. We first validated the detection performance of a next-generation sequencing (NGS) cancer hotspot panel, OncoAim, on formalin-fixed paraffin-embedded (FFPE) samples. We then utilized OncoAim to delineate the genomic aberrations in Chinese NSCLC patients. Overall detection performance was powerful for mutations with allele frequency (MAF) ≥ 5% at >500 × coverage depth, with >99% sensitivity, high specificity (positive predictive value > 99%), 94% accuracy and 96% repeatability. Profiling 422 NSCLC FFPE samples revealed that patient characteristics, including gender, age, lymphatic spread, histologic grade and histologic subtype were significantly associated with the mutation incidence of EGFR and TP53. Moreover, RTK signaling pathway activation was enriched in adenocarcinoma, while PI(3)K pathway activation, oxidative stress pathway activation, and TP53 pathway inhibition were more prevalent in squamous cell carcinoma. Additionally, novel co-existence (e.g., variants in BRAF and PTEN) and mutual-exclusiveness (e.g., alterations in EGFR and NFE2L2) were found. Finally, we revealed distinct mutation spectrum in TP53, as well as a previously undervalued PTEN aberration. Our findings could aid in improving diagnosis, prognosis and personalized therapeutic decisions of Chinese NSCLC patients.
Collapse
|
42
|
Abstract
The tumor suppressor phosphatase and tension homolog (PTEN) is frequently mutated in human cancers, and it functions in multiple ways to safeguard cells from tumorigenesis. In the cytoplasm, PTEN antagonizes the PI3K/AKT pathway and suppresses cellular proliferation and survival. In the nucleus, PTEN is indispensable for the maintenance of genomic stability. In addition, PTEN loss leads to extensive changes in gene expression at the transcriptional level. The linker histone H1, generally considered as a transcriptional repressor, binds to the nucleosome to form a structure named the chromatosome. The dynamics between H1 and chromatin play an important role in determining gene expression. Here, we summarize the current understanding of roles of PTEN in controlling chromatin dynamics and global gene expression, which is crucial function of nuclear PTEN. We will also introduce the recent discovery of the PTEN family members and their functions.
Collapse
Affiliation(s)
- Jingyi Yang
- Institute of Systems Biomedicine, Beijing Key Laboratory of Tumor Systems Biology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing 100191, China
| | - Yuxin Yin
- Institute of Systems Biomedicine, Beijing Key Laboratory of Tumor Systems Biology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing 100191, China.,Peking-Tsinghua Center for Life Sciences, Peking University Health Science Center, Beijing 100191, China
| |
Collapse
|
43
|
Ballar Kirmizibayrak P, Erbaykent-Tepedelen B, Gozen O, Erzurumlu Y. Divergent Modulation of Proteostasis in Prostate Cancer. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1233:117-151. [PMID: 32274755 DOI: 10.1007/978-3-030-38266-7_5] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Proteostasis regulates key cellular processes such as cell proliferation, differentiation, transcription, and apoptosis. The mechanisms by which proteostasis is regulated are crucial and the deterioration of cellular proteostasis has been significantly associated with tumorigenesis since it specifically targets key oncoproteins and tumor suppressors. Prostate cancer (PCa) is the second most common cause of cancer death in men worldwide. Androgens mediate one of the most central signaling pathways in all stages of PCa via the androgen receptor (AR). In addition to their regulation by hormones, PCa cells are also known to be highly secretory and are particularly prone to ER stress as proper ER function is essential. Alterations in various complex signaling pathways and cellular processes including cell cycle control, transcription, DNA repair, apoptosis, cell adhesion, epithelial-mesenchymal transition (EMT), and angiogenesis are critical factors influencing PCa development through key molecular changes mainly by posttranslational modifications in PCa-related proteins, including AR, NKX3.1, PTEN, p53, cyclin D1, and p27. Several ubiquitin ligases like MDM2, Siah2, RNF6, CHIP, and substrate-binding adaptor SPOP; deubiquitinases such as USP7, USP10, USP26, and USP12 are just some of the modifiers involved in the regulation of these key proteins via ubiquitin-proteasome system (UPS). Some ubiquitin-like modifiers, especially SUMOs, have been also closely associated with PCa. On the other hand, the proteotoxicity resulting from misfolded proteins and failure of ER adaptive capacity induce unfolded protein response (UPR) that is an indispensable signaling mechanism for PCa development. Lastly, ER-associated degradation (ERAD) also plays a crucial role in prostate tumorigenesis. In this section, the relationship between prostate cancer and proteostasis will be discussed in terms of UPS, UPR, SUMOylation, ERAD, and autophagy.
Collapse
Affiliation(s)
| | | | - Oguz Gozen
- Faculty of Medicine, Department of Physiology, Ege University, Izmir, Turkey
| | - Yalcin Erzurumlu
- Faculty of Pharmacy, Department of Biochemistry, Suleyman Demirel University, Isparta, Turkey
| |
Collapse
|
44
|
Chang H, Cai Z, Roberts TM. The Mechanisms Underlying PTEN Loss in Human Tumors Suggest Potential Therapeutic Opportunities. Biomolecules 2019; 9:biom9110713. [PMID: 31703360 PMCID: PMC6921025 DOI: 10.3390/biom9110713] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 11/01/2019] [Accepted: 11/04/2019] [Indexed: 12/13/2022] Open
Abstract
In this review, we will first briefly describe the diverse molecular mechanisms associated with PTEN loss of function in cancer. We will then proceed to discuss the molecular mechanisms linking PTEN loss to PI3K activation and demonstrate how these mechanisms suggest possible therapeutic approaches for patients with PTEN-null tumors.
Collapse
Affiliation(s)
- Hyeyoun Chang
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; (H.C.); (Z.C.)
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02215, USA
- KIST-DFCI On-Site Lab, Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Zhenying Cai
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; (H.C.); (Z.C.)
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02215, USA
| | - Thomas M. Roberts
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; (H.C.); (Z.C.)
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02215, USA
- Correspondence: ; Tel.: +1-617-632-3049
| |
Collapse
|
45
|
Wang K, Liu J, Zhao X, Li H, Luo G, Yu Y, Guo Y, Zhang L, Zhu J, Wang S, Hua W, Yang A, Zhang R, Li J. WWP2 regulates proliferation of gastric cancer cells in a PTEN-dependent manner. Biochem Biophys Res Commun 2019; 521:652-659. [PMID: 31677789 DOI: 10.1016/j.bbrc.2019.10.179] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 10/25/2019] [Indexed: 12/24/2022]
Abstract
WW domain containing E3 Ub-protein ligase 2 (WWP2) plays an important role in tumor progression as an E3 ligase of PTEN. Here, we investigated the role of WWP2 in gastric cancer (GC). We found that WWP2 is overexpressed in GC tissues, which is closely related to poor prognosis of GC patients. Using a WWP2-shRNA lentivirus expressing system, we established WWP2 stable-knockdown GC cell lines and found that knockdown of WWP2 inhibits the proliferation of GC cells both in vitro and in vivo. Also, WWP2 silencing induced the up-regulation of PTEN protein level and down-regulation of AKT phosphorylation level. We further investigated the role of PTEN in this regulating process by performing rescue assay and found that PTEN is essential for WWP2-mediated regulation of GC cells proliferation. Taken together, our results demonstrated that WWP2 promotes proliferation of GC cells by downregulating PTEN, which may provide new therapeutic targets for GC.
Collapse
Affiliation(s)
- Ke Wang
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, 710032, Xi'an, China; State Key Laboratory of Cancer Biology, Department of Biochemistry and Molecular Biology, Fourth Military Medical University, 710032, Xi'an, China
| | - Jun Liu
- State Key Laboratory of Cancer Biology, Department of Biochemistry and Molecular Biology, Fourth Military Medical University, 710032, Xi'an, China
| | - Xinhui Zhao
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, 710032, Xi'an, China; State Key Laboratory of Cancer Biology, Department of Biochemistry and Molecular Biology, Fourth Military Medical University, 710032, Xi'an, China
| | - Haitong Li
- School of Basic Medicine, The Air Force Military Medical University, 710032, Xi'an, China
| | - Guangwei Luo
- School of Basic Medicine, The Air Force Military Medical University, 710032, Xi'an, China
| | - Yanping Yu
- School of Clinical Medicine, Xi'an Medical University, 710032, Xi'an, China
| | - Yuan Guo
- School of Clinical Medicine, Xi'an Medical University, 710032, Xi'an, China
| | - Long Zhang
- School of Clinical Medicine, Xi'an Medical University, 710032, Xi'an, China
| | - Jun Zhu
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, 710032, Xi'an, China
| | - Shuai Wang
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, 710032, Xi'an, China
| | - Wei Hua
- Department of Obstetrics and Gynecology, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China
| | - Angang Yang
- State Key Laboratory of Cancer Biology, Department of Immunology, Fourth Military Medical University, 710032, Xi'an, China
| | - Rui Zhang
- State Key Laboratory of Cancer Biology, Department of Biochemistry and Molecular Biology, Fourth Military Medical University, 710032, Xi'an, China; State Key Laboratory of Cancer Biology, Department of Immunology, Fourth Military Medical University, 710032, Xi'an, China.
| | - Jipeng Li
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, 710032, Xi'an, China; Department of Experimental Surgery, Xijing Hospital, Fourth Military Medical University, 710032, Xi'an, China.
| |
Collapse
|
46
|
Carrà G, Russo I, Guerrasio A, Morotti A. Nuclear-cytoplasmic Shuttling in Chronic Myeloid Leukemia: Implications in Leukemia Maintenance and Therapy. Cells 2019; 8:E1248. [PMID: 31614958 PMCID: PMC6830087 DOI: 10.3390/cells8101248] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 10/10/2019] [Accepted: 10/11/2019] [Indexed: 01/09/2023] Open
Abstract
Nuclear-cytoplasmic shuttling is a highly regulated and complex process, which involves both proteins and nucleic acids. Changes in cellular compartmentalization of various proteins, including oncogenes and tumor suppressors, affect cellular behavior, promoting or inhibiting proliferation, apoptosis and sensitivity to therapies. In this review, we will recapitulate the role of various shuttling components in Chronic Myeloid Leukemia and we will provide insights on the potential role of shuttling proteins as therapeutic targets.
Collapse
Affiliation(s)
- Giovanna Carrà
- Department of Clinical and Biological Sciences, University of Turin, Regione Gonzole 10, 10043 Orbassano (Turin), Italy.
| | - Isabella Russo
- Department of Clinical and Biological Sciences, University of Turin, Regione Gonzole 10, 10043 Orbassano (Turin), Italy.
| | - Angelo Guerrasio
- Department of Clinical and Biological Sciences, University of Turin, Regione Gonzole 10, 10043 Orbassano (Turin), Italy.
| | - Alessandro Morotti
- Department of Clinical and Biological Sciences, University of Turin, Regione Gonzole 10, 10043 Orbassano (Turin), Italy.
| |
Collapse
|
47
|
Morales JA, Gonzalez-Kantun WA, Rodriguez-Zapata LC, Ramón-Ugalde J, Castano E. The effect of plant stress on phosphoinositides. Cell Biochem Funct 2019; 37:553-559. [PMID: 31478243 DOI: 10.1002/cbf.3432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 06/20/2019] [Accepted: 08/05/2019] [Indexed: 01/22/2023]
Abstract
Phosphoinositides are very versatile molecules with a plethora of functions such as cytokinesis, chemotaxis, cell survival, and cell death. Their functions depend on the proteins with which they interact. Thus, when interacting with phospholipases, phosphatases, or kinases, they can be precursors of second messengers in different signalling pathways. They could be second messengers themselves and interact directly with other proteins to modulate their functions trough changing its localization and activity or enhancing its synthesis rate. Because they are more abundant in animal cells and their importance in diseases such as cancer has taken priority, the study of the phosphoinositides in plants has not evolved to the same extent. Nevertheless, several studies have shown the significance of these lipids in plant cells viability and environmental response. This review focuses on phosphoinositides response to abiotic and biotic stress, showing their implication in plant survival during different stages of development. SIGNIFICANCE OF THE STUDY: This review is focused on plant PIPs functions in stress, highlighting in the main differences between plant and mammal PIPs and the novel interactions that could be extrapolated to animal models to contribute in a better understanding of these pivotal molecules.
Collapse
Affiliation(s)
- Javier Adrian Morales
- Unidad de Bioquímica y Biología Molecular de Plantas, Centro de Investigación Científica de Yucatán, Mérida, Mexico
| | - Wilma A Gonzalez-Kantun
- Unidad de Bioquímica y Biología Molecular de Plantas, Centro de Investigación Científica de Yucatán, Mérida, Mexico
| | | | - Julio Ramón-Ugalde
- Centro de Selección y Reproducción Ovina (CeSyRO), Instituto Tecnológico de Conkal (ITC), Mérida, Mexico
| | - Enrique Castano
- Unidad de Bioquímica y Biología Molecular de Plantas, Centro de Investigación Científica de Yucatán, Mérida, Mexico
| |
Collapse
|
48
|
Chatterjee N, Pazarentzos E, Mayekar MK, Gui P, Allegakoen DV, Hrustanovic G, Olivas V, Lin L, Verschueren E, Johnson JR, Hofree M, Yan JJ, Newton BW, Dollen JV, Earnshaw CH, Flanagan J, Chan E, Asthana S, Ideker T, Wu W, Suzuki J, Barad BA, Kirichok Y, Fraser JS, Weiss WA, Krogan NJ, Tulpule A, Sabnis AJ, Bivona TG. Synthetic Essentiality of Metabolic Regulator PDHK1 in PTEN-Deficient Cells and Cancers. Cell Rep 2019; 28:2317-2330.e8. [PMID: 31461649 PMCID: PMC6728083 DOI: 10.1016/j.celrep.2019.07.063] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 06/19/2019] [Accepted: 07/18/2019] [Indexed: 12/17/2022] Open
Abstract
Phosphatase and tensin homolog deleted on chromosome 10 (PTEN) is a tumor suppressor and bi-functional lipid and protein phosphatase. We report that the metabolic regulator pyruvate dehydrogenase kinase1 (PDHK1) is a synthetic-essential gene in PTEN-deficient cancer and normal cells. The PTEN protein phosphatase dephosphorylates nuclear factor κB (NF-κB)-activating protein (NKAP) and limits NFκB activation to suppress expression of PDHK1, a NF-κB target gene. Loss of the PTEN protein phosphatase upregulates PDHK1 to induce aerobic glycolysis and PDHK1 cellular dependence. PTEN-deficient human tumors harbor increased PDHK1, a biomarker of decreased patient survival. This study uncovers a PTEN-regulated signaling pathway and reveals PDHK1 as a potential target in PTEN-deficient cancers.
Collapse
Affiliation(s)
- Nilanjana Chatterjee
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA.
| | - Evangelos Pazarentzos
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Manasi K Mayekar
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Philippe Gui
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - David V Allegakoen
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Gorjan Hrustanovic
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Victor Olivas
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Luping Lin
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Erik Verschueren
- J. David Gladstone Institutes, San Francisco, CA 94158, USA; Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, CA 94158, USA; QB3, California Institute for Quantitative Biosciences, San Francisco, CA 94158, USA
| | - Jeffrey R Johnson
- J. David Gladstone Institutes, San Francisco, CA 94158, USA; Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, CA 94158, USA; QB3, California Institute for Quantitative Biosciences, San Francisco, CA 94158, USA
| | - Matan Hofree
- Department of Bioengineering, University of California, San Diego, San Diego, CA 92093, USA
| | - Jenny J Yan
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Billy W Newton
- J. David Gladstone Institutes, San Francisco, CA 94158, USA; Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, CA 94158, USA; QB3, California Institute for Quantitative Biosciences, San Francisco, CA 94158, USA
| | - John V Dollen
- J. David Gladstone Institutes, San Francisco, CA 94158, USA; Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, CA 94158, USA; QB3, California Institute for Quantitative Biosciences, San Francisco, CA 94158, USA
| | - Charles H Earnshaw
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Jennifer Flanagan
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Elton Chan
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Saurabh Asthana
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Trey Ideker
- Department of Bioengineering, University of California, San Diego, San Diego, CA 92093, USA
| | - Wei Wu
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Junji Suzuki
- Department of Physiology, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Benjamin A Barad
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Yuriy Kirichok
- Department of Physiology, University of California, San Francisco, San Francisco, CA 94158, USA
| | - James S Fraser
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, CA 94158, USA
| | - William A Weiss
- Department of Neurology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Nevan J Krogan
- J. David Gladstone Institutes, San Francisco, CA 94158, USA; Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, CA 94158, USA; QB3, California Institute for Quantitative Biosciences, San Francisco, CA 94158, USA
| | - Asmin Tulpule
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Amit J Sabnis
- Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Trever G Bivona
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94158, USA; Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94158, USA; Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, CA 94158, USA; QB3, California Institute for Quantitative Biosciences, San Francisco, CA 94158, USA.
| |
Collapse
|
49
|
Abbas A, Romigh T, Eng C. PTEN interacts with RNA polymerase II to dephosphorylate polymerase II C-terminal domain. Oncotarget 2019; 10:4951-4959. [PMID: 31452836 PMCID: PMC6697640 DOI: 10.18632/oncotarget.27128] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 07/17/2019] [Indexed: 11/25/2022] Open
Abstract
Gene transcription is a highly complex and strictly regulated process. RNA polymerase II (Pol II) C-terminal domain (CTD) undergoes massive cycles of phosphorylation and dephosphorylation during the process of gene transcription. These post-translational modifications of CTD provide an interactive platform for various factors required for transcription initiation, elongation, termination, and co-transcriptional RNA processing. Pol II CTD kinases and phosphatases are key regulators and any deviation may cause genome-wide transcriptional dysregulation leading to various pathological conditions including cancer. PTEN, a well known tumor suppressor, is one of the most commonly somatically altered in diverse malignancies. When mutated in the germline, PTEN causes cancer predisposition. Numerous studies have demonstrated that PTEN regulates the expression of hundreds of genes, however, no mechanism is known so far. PTEN is a dual specificity phosphatase, using both lipid and protein as substrates. In the present study, we demonstrate that PTEN interacts with the RNA Pol II and that PTEN expression is inversely correlated with global phosphorylation of Pol II CTD. Furthermore, PTEN dephosphorylates Pol II CTD in vitro with a significant specificity for Ser5p. Interestingly, ChIP-seq data analysis revealed that PTEN globally binds to promoter proximal regions, and PTEN loss increases genome-wide Pol II Ser5p occupancy, suggest that PTEN is a Pol II CTD phosphatase. Our observations demonstrate an unexplored function of PTEN with the potential of global transcriptional regulation, adding a new dimension to somatic carcinogenesis and germline cancer predisposition.
Collapse
Affiliation(s)
- Ata Abbas
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, 44195 OH, USA.,Present address: Division of Hematology Oncology, Department of Medicine, Case Western Reserve University, Cleveland, 44106 OH, USA
| | - Todd Romigh
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, 44195 OH, USA
| | - Charis Eng
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, 44195 OH, USA.,Taussig Cancer Institute, Cleveland Clinic, Cleveland, 44195 OH, USA.,Department of Genetics and Genome Sciences, Case Western Reserve University School of Medicine, Cleveland, 44116 OH, USA.,Germline High Risk Focus Group, Case Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, 44116 OH, USA
| |
Collapse
|
50
|
Luongo F, Colonna F, Calapà F, Vitale S, Fiori ME, De Maria R. PTEN Tumor-Suppressor: The Dam of Stemness in Cancer. Cancers (Basel) 2019; 11:E1076. [PMID: 31366089 PMCID: PMC6721423 DOI: 10.3390/cancers11081076] [Citation(s) in RCA: 97] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 07/24/2019] [Accepted: 07/26/2019] [Indexed: 12/11/2022] Open
Abstract
PTEN is one of the most frequently inactivated tumor suppressor genes in cancer. Loss or variation in PTEN gene/protein levels is commonly observed in a broad spectrum of human cancers, while germline PTEN mutations cause inherited syndromes that lead to increased risk of tumors. PTEN restrains tumorigenesis through different mechanisms ranging from phosphatase-dependent and independent activities, subcellular localization and protein interaction, modulating a broad array of cellular functions including growth, proliferation, survival, DNA repair, and cell motility. The main target of PTEN phosphatase activity is one of the most significant cell growth and pro-survival signaling pathway in cancer: PI3K/AKT/mTOR. Several shreds of evidence shed light on the critical role of PTEN in normal and cancer stem cells (CSCs) homeostasis, with its loss fostering the CSC compartment in both solid and hematologic malignancies. CSCs are responsible for tumor propagation, metastatic spread, resistance to therapy, and relapse. Thus, understanding how alterations of PTEN levels affect CSC hallmarks could be crucial for the development of successful therapeutic approaches. Here, we discuss the most significant findings on PTEN-mediated control of CSC state. We aim to unravel the role of PTEN in the regulation of key mechanisms specific for CSCs, such as self-renewal, quiescence/cell cycle, Epithelial-to-Mesenchymal-Transition (EMT), with a particular focus on PTEN-based therapy resistance mechanisms and their exploitation for novel therapeutic approaches in cancer treatment.
Collapse
Affiliation(s)
- Francesca Luongo
- Istituto di Patologia Generale, Università Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Francesca Colonna
- Istituto di Patologia Generale, Università Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Federica Calapà
- Istituto di Patologia Generale, Università Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Sara Vitale
- Istituto di Patologia Generale, Università Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy
| | - Micol E Fiori
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, 00161 Rome, Italy.
| | - Ruggero De Maria
- Istituto di Patologia Generale, Università Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy.
- Scientific Vice-Direction, Fondazione Policlinico Universitario "A. Gemelli"-I.R.C.C.S., Largo Francesco Vito 1-8, 00168 Rome, Italy.
| |
Collapse
|