1
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Hermanova I, Zúñiga-García P, Caro-Maldonado A, Fernandez-Ruiz S, Salvador F, Martín-Martín N, Zabala-Letona A, Nuñez-Olle M, Torrano V, Camacho L, Lizcano JM, Talamillo A, Carreira S, Gurel B, Cortazar AR, Guiu M, López JI, Martinez-Romero A, Astobiza I, Valcarcel-Jimenez L, Lorente M, Arruabarrena-Aristorena A, Velasco G, Gomez-Muñoz A, Suárez-Cabrera C, Lodewijk I, Flores JM, Sutherland JD, Barrio R, de Bono JS, Paramio JM, Trka J, Graupera M, Gomis RR, Carracedo A. Genetic manipulation of LKB1 elicits lethal metastatic prostate cancer. J Exp Med 2021; 217:151590. [PMID: 32219437 PMCID: PMC7971141 DOI: 10.1084/jem.20191787] [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: 09/23/2019] [Revised: 12/16/2019] [Accepted: 02/06/2020] [Indexed: 12/31/2022] Open
Abstract
Gene dosage is a key defining factor to understand cancer pathogenesis and progression, which requires the development of experimental models that aid better deconstruction of the disease. Here, we model an aggressive form of prostate cancer and show the unconventional association of LKB1 dosage to prostate tumorigenesis. Whereas loss of Lkb1 alone in the murine prostate epithelium was inconsequential for tumorigenesis, its combination with an oncogenic insult, illustrated by Pten heterozygosity, elicited lethal metastatic prostate cancer. Despite the low frequency of LKB1 deletion in patients, this event was significantly enriched in lung metastasis. Modeling the role of LKB1 in cellular systems revealed that the residual activity retained in a reported kinase-dead form, LKB1K78I, was sufficient to hamper tumor aggressiveness and metastatic dissemination. Our data suggest that prostate cells can function normally with low activity of LKB1, whereas its complete absence influences prostate cancer pathogenesis and dissemination.
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Affiliation(s)
- Ivana Hermanova
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain
| | - Patricia Zúñiga-García
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain
| | - Alfredo Caro-Maldonado
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain
| | - Sonia Fernandez-Ruiz
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain.,CIBERONC (Centro de Investigación Biomédica en Red de Cáncer), Madrid, Spain
| | - Fernando Salvador
- CIBERONC (Centro de Investigación Biomédica en Red de Cáncer), Madrid, Spain.,Cancer Science Program, Institute for Research in Biomedicine, The Barcelona Institute of Science and Technology, Barcelona, Spain
| | - Natalia Martín-Martín
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain.,CIBERONC (Centro de Investigación Biomédica en Red de Cáncer), Madrid, Spain
| | - Amaia Zabala-Letona
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain.,CIBERONC (Centro de Investigación Biomédica en Red de Cáncer), Madrid, Spain
| | - Marc Nuñez-Olle
- Cancer Science Program, Institute for Research in Biomedicine, The Barcelona Institute of Science and Technology, Barcelona, Spain
| | - Verónica Torrano
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain.,CIBERONC (Centro de Investigación Biomédica en Red de Cáncer), Madrid, Spain.,Biochemistry and Molecular Biology Department, University of the Basque Country, Bilbao, Spain
| | - Laura Camacho
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain.,Biochemistry and Molecular Biology Department, University of the Basque Country, Bilbao, Spain
| | - Jose M Lizcano
- Protein Kinases and Signal Transduction Laboratory, Institut de Neurociències and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
| | - Ana Talamillo
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain
| | | | - Bora Gurel
- The Institute of Cancer Research, London, UK
| | - Ana R Cortazar
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain.,CIBERONC (Centro de Investigación Biomédica en Red de Cáncer), Madrid, Spain
| | - Marc Guiu
- Cancer Science Program, Institute for Research in Biomedicine, The Barcelona Institute of Science and Technology, Barcelona, Spain
| | - Jose I López
- Department of Pathology, Cruces University Hospital, Biocruces Institute, University of the Basque Country, Barakaldo, Spain
| | - Anabel Martinez-Romero
- CIBERONC (Centro de Investigación Biomédica en Red de Cáncer), Madrid, Spain.,Vascular Signalling Laboratory, Program Against Cancer Therapeutic Resistance (ProCURE), Institut d'Investigació Biomèdica de Bellvitge, Barcelona, Spain
| | - Ianire Astobiza
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain.,CIBERONC (Centro de Investigación Biomédica en Red de Cáncer), Madrid, Spain
| | - Lorea Valcarcel-Jimenez
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain
| | - Mar Lorente
- Department of Biochemistry and Molecular Biology, School of Biology, Complutense University, Madrid, Spain
| | | | - Guillermo Velasco
- Department of Biochemistry and Molecular Biology, School of Biology, Complutense University, Madrid, Spain.,Instituto de Investigaciones Sanitarias San Carlos, Madrid, Spain
| | - Antonio Gomez-Muñoz
- Biochemistry and Molecular Biology Department, University of the Basque Country, Bilbao, Spain
| | - Cristian Suárez-Cabrera
- Grupo de Oncología Celular y Molecular, Hospital Universitario 12 de Octubre, Madrid, Spain.,Unidad de Oncología Molecular, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Madrid, Spain
| | - Iris Lodewijk
- Grupo de Oncología Celular y Molecular, Hospital Universitario 12 de Octubre, Madrid, Spain.,Unidad de Oncología Molecular, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Madrid, Spain
| | - Juana M Flores
- Department of Animal Medicine and Surgery, School of Veterinary Medicine, Complutense University of Madrid, Madrid, Spain
| | - James D Sutherland
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain
| | - Rosa Barrio
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain
| | - Johann S de Bono
- The Institute of Cancer Research, London, UK.,The Royal Marsden National Health Service Foundation Trust, London, UK
| | - Jesús M Paramio
- CIBERONC (Centro de Investigación Biomédica en Red de Cáncer), Madrid, Spain.,Grupo de Oncología Celular y Molecular, Hospital Universitario 12 de Octubre, Madrid, Spain.,Unidad de Oncología Molecular, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Madrid, Spain
| | - Jan Trka
- Childhood Leukaemia Investigation, Prague, Czech Republic.,Department of Paediatric Haematology/Oncology, Second Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - Mariona Graupera
- CIBERONC (Centro de Investigación Biomédica en Red de Cáncer), Madrid, Spain.,Vascular Signalling Laboratory, Program Against Cancer Therapeutic Resistance (ProCURE), Institut d'Investigació Biomèdica de Bellvitge, Barcelona, Spain
| | - Roger R Gomis
- CIBERONC (Centro de Investigación Biomédica en Red de Cáncer), Madrid, Spain.,Cancer Science Program, Institute for Research in Biomedicine, The Barcelona Institute of Science and Technology, Barcelona, Spain.,Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
| | - Arkaitz Carracedo
- Center for Cooperative Research in Biosciences, Basque Research and Technology Alliance (BRTA), Derio, Spain.,CIBERONC (Centro de Investigación Biomédica en Red de Cáncer), Madrid, Spain.,Biochemistry and Molecular Biology Department, University of the Basque Country, Bilbao, Spain.,Ikerbasque, Basque Foundation for Science, Bilbao, Spain
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2
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Genomic and Functional Regulation of TRIB1 Contributes to Prostate Cancer Pathogenesis. Cancers (Basel) 2020; 12:cancers12092593. [PMID: 32932846 PMCID: PMC7565426 DOI: 10.3390/cancers12092593] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 08/26/2020] [Accepted: 09/04/2020] [Indexed: 12/17/2022] Open
Abstract
Prostate cancer is the most frequent malignancy in European men and the second worldwide. One of the major oncogenic events in this disease includes amplification of the transcription factor cMYC. Amplification of this oncogene in chromosome 8q24 occurs concomitantly with the copy number increase in a subset of neighboring genes and regulatory elements, but their contribution to disease pathogenesis is poorly understood. Here we show that TRIB1 is among the most robustly upregulated coding genes within the 8q24 amplicon in prostate cancer. Moreover, we demonstrate that TRIB1 amplification and overexpression are frequent in this tumor type. Importantly, we find that, parallel to its amplification, TRIB1 transcription is controlled by cMYC. Mouse modeling and functional analysis revealed that aberrant TRIB1 expression is causal to prostate cancer pathogenesis. In sum, we provide unprecedented evidence for the regulation and function of TRIB1 in prostate cancer.
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3
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Venniyoor A. PTEN: A Thrifty Gene That Causes Disease in Times of Plenty? Front Nutr 2020; 7:81. [PMID: 32582754 PMCID: PMC7290048 DOI: 10.3389/fnut.2020.00081] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 05/06/2020] [Indexed: 12/15/2022] Open
Abstract
The modern obesity epidemic with associated disorders of metabolism and cancer has been attributed to the presence of "thrifty genes". In the distant past, these genes helped the organism to improve energy efficiency and store excess energy safely as fat to survive periods of famine, but in the present day obesogenic environment, have turned detrimental. I propose PTEN as the likely gene as it has functions that span metabolism, cancer and reproduction, all of which are deranged in obesity and insulin resistance. The activity of PTEN can be calibrated in utero by availability of nutrients by the methylation arm of the epigenetic pathway. Deficiency of protein and choline has been shown to upregulate DNA methyltransferases (DNMT), especially 1 and 3a; these can then methylate promoter region of PTEN and suppress its expression. Thus, the gene is tuned like a metabolic rheostat proportional to the availability of specific nutrients, and the resultant "dose" of the protein, which sits astride and negatively regulates the insulin-PI3K/AKT/mTOR pathway, decides energy usage and proliferation. This "fixes" the metabolic capacity of the organism periconceptionally to a specific postnatal level of nutrition, but when faced with a discordant environment, leads to obesity related diseases.
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Affiliation(s)
- Ajit Venniyoor
- Department of Medical Oncology, National Oncology Centre, The Royal Hospital, Muscat, Oman
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4
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Fan X, Bjerke GA, Riemondy K, Wang L, Yi R. A basal-enriched microRNA is required for prostate tumorigenesis in a Pten knockout mouse model. Mol Carcinog 2019; 58:2241-2253. [PMID: 31512783 DOI: 10.1002/mc.23112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 08/28/2019] [Indexed: 02/06/2023]
Abstract
MicroRNAs (miRNAs) play important roles in prostate cancer development. However, it remains unclear how individual miRNAs contribute to the initiation and progression of prostate cancer. Here we show that a basal layer-enriched miRNA is required for prostate tumorigenesis. We identify miR-205 as the most highly expressed miRNA and enriched in the basal cells of the prostate. Although miR-205 is not required for normal prostate development and homeostasis, genetic deletion of miR-205 in a Pten null tumor model significantly compromises tumor progression and does not promote metastasis. In Pten null basal cells, loss of miR-205 attenuates pAkt levels and promotes cellular senescence. Furthermore, although overexpression of miR-205 in prostate cancer cells with luminal phenotypes inhibits cell growth in both human and mouse, miR-205 has a minimal effect on the growth of a normal human prostate cell line. Taken together, we have provided genetic evidence for a requirement of miR-205 in the progression of Pten null-induced prostate cancer.
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Affiliation(s)
- Xiying Fan
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Boulder, Colorado
| | - Glen A Bjerke
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Boulder, Colorado
| | - Kent Riemondy
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Boulder, Colorado
| | - Li Wang
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Boulder, Colorado
| | - Rui Yi
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Boulder, Colorado
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5
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Sementino E, Menges CW, Kadariya Y, Peri S, Xu J, Liu Z, Wilkes RG, Cai KQ, Rauscher FJ, Klein-Szanto AJ, Testa JR. Inactivation of Tp53 and Pten drives rapid development of pleural and peritoneal malignant mesotheliomas. J Cell Physiol 2018; 233:8952-8961. [PMID: 29904909 DOI: 10.1002/jcp.26830] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 05/09/2018] [Indexed: 02/03/2023]
Abstract
Malignant mesothelioma (MM) is a therapy-resistant cancer arising primarily from the lining of the pleural and peritoneal cavities. The most frequently altered genes in human MM are cyclin-dependent kinase inhibitor 2A (CDKN2A), which encodes components of the p53 (p14ARF) and RB (p16INK4A) pathways, BRCA1-associated protein 1 (BAP1), and neurofibromatosis 2 (NF2). Furthermore, the p53 gene (TP53) itself is mutated in ~15% of MMs. In many MMs, the PI3K-PTEN-AKT-mTOR signaling node is hyperactivated, which contributes to tumor cell survival and therapeutic resistance. Here, we demonstrate that the inactivation of both Tp53 and Pten in the mouse mesothelium is sufficient to rapidly drive aggressive MMs. PtenL/L ;Tp53L/L mice injected intraperitoneally or intrapleurally with adenovirus-expressing Cre recombinase developed high rates of peritoneal and pleural MMs (92% of mice with a median latency of 9.4 weeks and 56% of mice with a median latency of 19.3 weeks, respectively). MM cells from these mice showed consistent activation of Akt-mTor signaling, chromosome breakage or aneuploidy, and upregulation of Myc; occasional downregulation of Bap1 was also observed. Collectively, these findings suggest that when Pten and Tp53 are lost in combination in mesothelial cells, DNA damage is not adequately repaired and genomic instability is widespread, whereas the activation of Akt due to Pten loss protects genomically damaged cells from apoptosis, thereby increasing the likelihood of tumor formation. Additionally, the mining of an online dataset (The Cancer Genome Atlas) revealed codeletions of PTEN and TP53 and/or CDKN2A/p14ARF in ~25% of human MMs, indicating that cooperative losses of these genes contribute to the development of a significant proportion of these aggressive neoplasms and suggesting key target pathways for therapeutic intervention.
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Affiliation(s)
- Eleonora Sementino
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Craig W Menges
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Yuwaraj Kadariya
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Suraj Peri
- Department of Biostatistics and Bioinformatics, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Jinfei Xu
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Zemin Liu
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Richard G Wilkes
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Kathy Q Cai
- Histopathology Facility, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Frank J Rauscher
- Gene Expression and Regulation Program, Wistar Institute, Philadelphia, Pennsylvania
| | | | - Joseph R Testa
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania
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6
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Igarashi A, Itoh K, Yamada T, Adachi Y, Kato T, Murata D, Sesaki H, Iijima M. Nuclear PTEN deficiency causes microcephaly with decreased neuronal soma size and increased seizure susceptibility. J Biol Chem 2018; 293:9292-9300. [PMID: 29735527 DOI: 10.1074/jbc.ra118.002356] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 04/20/2018] [Indexed: 12/25/2022] Open
Abstract
Defects in phosphatase and tensin homolog (PTEN) are associated with neurological disorders and tumors. PTEN functions at two primary intracellular locations: the plasma membrane and the nucleus. At the membrane, PTEN functions as a phosphatidylinositol (3,4,5)-trisphosphate phosphatase and suppresses PI 3-kinase signaling that drives cell growth and tumorigenesis. However, the in vivo function of nuclear PTEN is unclear. Here, using CRISPR/Cas9, we generated a mouse model in which PTEN levels in the nucleus are decreased. Nuclear PTEN-deficient mice were born with microcephaly and maintained a small brain during adulthood. The size of neuronal soma was significantly smaller in the cerebellum, cerebral cortex, and hippocampus. Also, these mice were prone to seizure. No changes in PI 3-kinase signaling were observed. By contrast, the size of other organs was unaffected. Therefore, nuclear PTEN is essential for the health of the brain by promoting the growth of neuronal soma size during development.
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Affiliation(s)
- Atsushi Igarashi
- From the Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | - Kie Itoh
- From the Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | - Tatsuya Yamada
- From the Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | - Yoshihiro Adachi
- From the Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | - Takashi Kato
- From the Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | - Daisuke Murata
- From the Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | - Hiromi Sesaki
- From the Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | - Miho Iijima
- From the Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
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7
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Caro-Maldonado A, Camacho L, Zabala-Letona A, Torrano V, Fernández-Ruiz S, Zamacola-Bascaran K, Arreal L, Valcárcel-Jiménez L, Martín-Martín N, Flores JM, Cortazar AR, Zúñiga-García P, Arruabarrena-Aristorena A, Guillaumond F, Cabrera D, Falcón-Perez JM, Aransay AM, Gomez-Muñoz A, Olivan M, Morote J, Carracedo A. Low-dose statin treatment increases prostate cancer aggressiveness. Oncotarget 2017; 9:1494-1504. [PMID: 29416709 PMCID: PMC5788577 DOI: 10.18632/oncotarget.22217] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 10/13/2017] [Indexed: 11/25/2022] Open
Abstract
Prostate cancer is diagnosed late in life, when co-morbidities are frequent. Among them, hypertension, hypercholesterolemia, diabetes or metabolic syndrome exhibit an elevated incidence. In turn, prostate cancer patients frequently undergo chronic pharmacological treatments that could alter disease initiation, progression and therapy response. Here we show that treatment with anti-cholesterolemic drugs, statins, at doses achieved in patients, enhance the pro-tumorigenic activity of obesogenic diets. In addition, the use of a mouse model of prostate cancer and human prostate cancer xenografts revealed that in vivo simvastatin administration alone increases prostate cancer aggressiveness. In vitro cell line systems supported the notion that this phenomenon occurs, at least in part, through the direct action on cancer cells of low doses of statins, in range of what is observed in human plasma. In sum, our results reveal a prostate cancer experimental system where statins exhibit an undesirable effect, and warrant further research to address the relevance and implications of this observation in human prostate cancer.
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Affiliation(s)
| | - Laura Camacho
- CIC bioGUNE, Bizkaia Technology Park, Derio, Spain.,Biochemistry and Molecular Biology Department, University of the Basque Country, Bilbao, Spain
| | | | - Verónica Torrano
- CIC bioGUNE, Bizkaia Technology Park, Derio, Spain.,CIBERONC, Madrid, Spain
| | | | | | - Leire Arreal
- CIC bioGUNE, Bizkaia Technology Park, Derio, Spain
| | | | | | - Juana M Flores
- Department of Animal Medicine and Surgery, School of Veterinary Medicine, Complutense University of Madrid, Madrid, Spain
| | | | | | | | - Fabienne Guillaumond
- Centre de Recherche en Cancérologie de Marseille, U1068, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Institut Paoli-Calmettes, Marseille, France.,UMR 7258, Centre National de la Recherche Scientifique, Paris, France.,Université Aix-Marseille, Marseille, France
| | | | - Juan M Falcón-Perez
- CIC bioGUNE, Bizkaia Technology Park, Derio, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas, Madrid, Spain.,IKERBASQUE, Basque foundation for science, Bilbao, Spain
| | - Ana M Aransay
- CIC bioGUNE, Bizkaia Technology Park, Derio, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas, Madrid, Spain
| | - Antonio Gomez-Muñoz
- Biochemistry and Molecular Biology Department, University of the Basque Country, Bilbao, Spain
| | - Mireia Olivan
- Department of Urology and Research Group in Urology, Vall d´Hebron Hospital, Vall d´Hebron Research Institute, and Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Juan Morote
- Department of Urology and Research Group in Urology, Vall d´Hebron Hospital, Vall d´Hebron Research Institute, and Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Arkaitz Carracedo
- CIC bioGUNE, Bizkaia Technology Park, Derio, Spain.,Biochemistry and Molecular Biology Department, University of the Basque Country, Bilbao, Spain.,CIBERONC, Madrid, Spain.,IKERBASQUE, Basque foundation for science, Bilbao, Spain
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8
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Mauro A, Omoyinmi E, Sebire NJ, Barnicoat A, Brogan P. De Novo PTEN Mutation in a Young Boy with Cutaneous Vasculitis. Case Rep Pediatr 2017; 2017:9682803. [PMID: 28523199 PMCID: PMC5421084 DOI: 10.1155/2017/9682803] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 03/27/2017] [Accepted: 04/04/2017] [Indexed: 01/01/2023] Open
Abstract
Phosphatase and tensin homolog (PTEN) is the protein encoded by the PTEN gene (10q23.3). PTEN mutations are related to a variety of rare diseases referred to collectively as PTEN hamartoma tumor syndromes (PHTS), which include Cowden Syndrome, Bannayan-Riley-Ruvalcaba syndrome, Proteus Syndrome, and Proteus-like syndrome. These diseases are associated with an increased risk of malignancy and for this reason an accurate and early diagnosis is essential in order to institute cancer surveillance. PTEN is a regulator of growth and homeostasis in immune system cells, although there are limited data describing immune dysregulation caused by PTEN mutations. We describe a case of PHTS syndrome caused by a de novo mutation in PTEN detected using a targeted next generation sequencing (NGS) gene panel which was instigated for workup of cutaneous vasculitis. We highlight the diagnostic utility of this approach and that mutations in PTEN may be associated with immune-dysregulatory features such as vasculitis in young children.
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Affiliation(s)
- Angela Mauro
- Department of Paediatrics, San Giacomo Hospital, Via Edilio Raggio, Novi Ligure, Italy
| | - Ebun Omoyinmi
- Infection, Inflammation, and Rheumatology Section, UCL Great Ormond Street Institute of Child Health, London, UK
| | - Neil James Sebire
- Department of Histopathology, Great Ormond Street Hospital NHS Foundation Trust, London, UK
| | - Angela Barnicoat
- Department of Clinical Genetics, Great Ormond Street Hospital NHS Foundation Trust, London, UK
| | - Paul Brogan
- Infection, Inflammation, and Rheumatology Section, UCL Great Ormond Street Institute of Child Health, London, UK
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9
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Torrano V, Valcarcel-Jimenez L, Cortazar AR, Liu X, Urosevic J, Castillo-Martin M, Fernández-Ruiz S, Morciano G, Caro-Maldonado A, Guiu M, Zúñiga-García P, Graupera M, Bellmunt A, Pandya P, Lorente M, Martín-Martín N, Sutherland JD, Sanchez-Mosquera P, Bozal-Basterra L, Zabala-Letona A, Arruabarrena-Aristorena A, Berenguer A, Embade N, Ugalde-Olano A, Lacasa-Viscasillas I, Loizaga-Iriarte A, Unda-Urzaiz M, Schultz N, Aransay AM, Sanz-Moreno V, Barrio R, Velasco G, Pinton P, Cordon-Cardo C, Locasale JW, Gomis RR, Carracedo A. The metabolic co-regulator PGC1α suppresses prostate cancer metastasis. Nat Cell Biol 2016; 18:645-656. [PMID: 27214280 PMCID: PMC4884178 DOI: 10.1038/ncb3357] [Citation(s) in RCA: 153] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 04/13/2016] [Indexed: 02/08/2023]
Abstract
Cellular transformation and cancer progression is accompanied by changes in the metabolic landscape. Master co-regulators of metabolism orchestrate the modulation of multiple metabolic pathways through transcriptional programs, and hence constitute a probabilistically parsimonious mechanism for general metabolic rewiring. Here we show that the transcriptional co-activator peroxisome proliferator-activated receptor gamma co-activator 1α (PGC1α) suppresses prostate cancer progression and metastasis. A metabolic co-regulator data mining analysis unveiled that PGC1α is downregulated in prostate cancer and associated with disease progression. Using genetically engineered mouse models and xenografts, we demonstrated that PGC1α opposes prostate cancer progression and metastasis. Mechanistically, the use of integrative metabolomics and transcriptomics revealed that PGC1α activates an oestrogen-related receptor alpha (ERRα)-dependent transcriptional program to elicit a catabolic state and metastasis suppression. Importantly, a signature based on the PGC1α-ERRα pathway exhibited prognostic potential in prostate cancer, thus uncovering the relevance of monitoring and manipulating this pathway for prostate cancer stratification and treatment.
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Affiliation(s)
- Veronica Torrano
- CIC bioGUNE, Bizkaia Technology Park, 801 bld., 48160 Derio, Bizkaia, Spain
| | | | - Ana Rosa Cortazar
- CIC bioGUNE, Bizkaia Technology Park, 801 bld., 48160 Derio, Bizkaia, Spain
| | - Xiaojing Liu
- Department of Pharmacology and Cancer Biology, Duke Cancer Institute, Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, North Carolina 27710, USA
| | - Jelena Urosevic
- Oncology Programme, Institute for Research in Biomedicine (IRB-Barcelona), The Barcelona Institute of Science and Technology, Barcelona 08028, Catalonia, Spain
| | - Mireia Castillo-Martin
- Department of Pathology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
- Department of Pathology, Fundação Champalimaud, Lisboa, Portugal
| | | | - Giampaolo Morciano
- Dept. of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara, Italy
| | | | - Marc Guiu
- Oncology Programme, Institute for Research in Biomedicine (IRB-Barcelona), The Barcelona Institute of Science and Technology, Barcelona 08028, Catalonia, Spain
| | | | - Mariona Graupera
- Vascular Signalling Laboratory, Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), Gran Via de l'Hospitalet 199-203, 08907 L'Hospitalet de Llobregat, Barcelona, Spain
| | - Anna Bellmunt
- Oncology Programme, Institute for Research in Biomedicine (IRB-Barcelona), The Barcelona Institute of Science and Technology, Barcelona 08028, Catalonia, Spain
| | - Pahini Pandya
- Tumour Plasticity Team, Randall Division of Cell and Molecular Biophysics, King's College London, New Hunt's House, Guy's Campus, London SE1 1UL, UK
| | - Mar Lorente
- Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University and Instituto de Investigaciones Sanitarias San Carlos (IdISSC) 28040 Madrid, Spain
| | | | | | | | | | | | | | - Antonio Berenguer
- Biostatistics / Bioinformatics Unit, - IRB Barcelona, Parc Científic de Barcelona, 08028 Barcelona, Spain
| | - Nieves Embade
- CIC bioGUNE, Bizkaia Technology Park, 801 bld., 48160 Derio, Bizkaia, Spain
| | | | | | | | | | - Nikolaus Schultz
- Computational Biology, Memorial Sloan-Kettering Cancer Center, NY, 10065, USA
| | - Ana Maria Aransay
- CIC bioGUNE, Bizkaia Technology Park, 801 bld., 48160 Derio, Bizkaia, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd)
| | - Victoria Sanz-Moreno
- Tumour Plasticity Team, Randall Division of Cell and Molecular Biophysics, King's College London, New Hunt's House, Guy's Campus, London SE1 1UL, UK
| | - Rosa Barrio
- CIC bioGUNE, Bizkaia Technology Park, 801 bld., 48160 Derio, Bizkaia, Spain
| | - Guillermo Velasco
- Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University and Instituto de Investigaciones Sanitarias San Carlos (IdISSC) 28040 Madrid, Spain
| | - Paolo Pinton
- Dept. of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara, Italy
| | - Carlos Cordon-Cardo
- Department of Pathology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Jason W. Locasale
- Department of Pharmacology and Cancer Biology, Duke Cancer Institute, Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, North Carolina 27710, USA
| | - Roger R. Gomis
- Oncology Programme, Institute for Research in Biomedicine (IRB-Barcelona), The Barcelona Institute of Science and Technology, Barcelona 08028, Catalonia, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona, Spain
| | - Arkaitz Carracedo
- CIC bioGUNE, Bizkaia Technology Park, 801 bld., 48160 Derio, Bizkaia, Spain
- Ikerbasque, Basque foundation for science, 48011 Bilbao, Spain
- Biochemistry and Molecular Biology Department, University of the Basque Country (UPV/EHU), P. O. Box 644, E-48080 Bilbao, Spain
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10
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Cho H, Herzka T, Stahlhut C, Watrud K, Robinson BD, Trotman LC. Rapid in vivo validation of candidate drivers derived from the PTEN-mutant prostate metastasis genome. Methods 2015; 77-78:197-204. [PMID: 25592467 PMCID: PMC4429512 DOI: 10.1016/j.ymeth.2014.12.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 12/09/2014] [Accepted: 12/30/2014] [Indexed: 12/16/2022] Open
Abstract
Human genome analyses have revealed that increasing gene copy number alteration is a driving force of incurable cancer of the prostate (CaP). Since most of the affected genes are hidden within large amplifications or deletions, there is a need for fast and faithful validation of drivers. However, classic genetic CaP engineering in mouse makes this a daunting task because generation, breeding based combination of alterations and non-invasive monitoring of disease are too time consuming and costly. To address the unmet need, we recently developed RapidCaP mice, which endogenously recreate human PTEN-mutant metastatic CaP based on Cre/Luciferase expressing viral infection, that is guided to Pten(loxP)/Trp53(loxP) prostate. Here we use a sensitized, non-metastatic Pten/Trp53-mutant RapidCaP system for functional validation of human metastasis drivers in a much accelerated time frame of only 3-4months. We used in vivo RNAi to target three candidate tumor suppressor genes FOXP1, RYBP and SHQ1, which reside in a frequent deletion on chromosome 3p and show that Shq1 cooperates with Pten and p53 to suppress metastasis. Our results thus demonstrate that the RapidCaP system forms a much needed platform for in vivo screening and validation of genes that drive endogenous lethal CaP.
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Affiliation(s)
- Hyejin Cho
- Cold Spring Harbor Laboratory, One Bungtown Road, Cold Spring Harbor, NY 11724, USA
| | - Tali Herzka
- Cold Spring Harbor Laboratory, One Bungtown Road, Cold Spring Harbor, NY 11724, USA
| | - Carlos Stahlhut
- Cold Spring Harbor Laboratory, One Bungtown Road, Cold Spring Harbor, NY 11724, USA
| | - Kaitlin Watrud
- Cold Spring Harbor Laboratory, One Bungtown Road, Cold Spring Harbor, NY 11724, USA
| | - Brian D Robinson
- Department of Pathology & Laboratory Medicine, New York-Presbyterian Hospital, Weill Cornell Medical College, 1300 York Avenue, 525 East 68th Street, New York, NY 10065, USA
| | - Lloyd C Trotman
- Cold Spring Harbor Laboratory, One Bungtown Road, Cold Spring Harbor, NY 11724, USA.
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11
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Bégay V, Smink JJ, Loddenkemper C, Zimmermann K, Rudolph C, Scheller M, Steinemann D, Leser U, Schlegelberger B, Stein H, Leutz A. Deregulation of the endogenous C/EBPβ LIP isoform predisposes to tumorigenesis. J Mol Med (Berl) 2014; 93:39-49. [PMID: 25401168 DOI: 10.1007/s00109-014-1215-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 09/17/2014] [Accepted: 10/17/2014] [Indexed: 12/25/2022]
Abstract
UNLABELLED Two long and one truncated isoforms (termed LAP*, LAP, and LIP, respectively) of the transcription factor CCAAT enhancer binding protein beta (C/EBPβ) are expressed from a single intronless Cebpb gene by alternative translation initiation. Isoform expression is sensitive to mammalian target of rapamycin (mTOR)-mediated activation of the translation initiation machinery and relayed through an upstream open reading frame (uORF) on the C/EBPβ mRNA. The truncated C/EBPβ LIP, initiated by high mTOR activity, has been implied in neoplasia, but it was never shown whether endogenous C/EBPβ LIP may function as an oncogene. In this study, we examined spontaneous tumor formation in C/EBPβ knockin mice that constitutively express only the C/EBPβ LIP isoform from its own locus. Our data show that deregulated C/EBPβ LIP predisposes to oncogenesis in many tissues. Gene expression profiling suggests that C/EBPβ LIP supports a pro-tumorigenic microenvironment, resistance to apoptosis, and alteration of cytokine/chemokine expression. The results imply that enhanced translation reinitiation of C/EBPβ LIP promotes tumorigenesis. Accordingly, pharmacological restriction of mTOR function might be a therapeutic option in tumorigenesis that involves enhanced expression of the truncated C/EBPβ LIP isoform. KEY MESSAGE Elevated C/EBPβ LIP promotes cancer in mice. C/EBPβ LIP is upregulated in B-NHL. Deregulated C/EBPβ LIP alters apoptosis and cytokine/chemokine networks. Deregulated C/EBPβ LIP may support a pro-tumorigenic microenvironment.
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Affiliation(s)
- Valérie Bégay
- Department of Tumorigenesis and Cell Differentiation, Max Delbrueck Center for Molecular Medicine, Robert-Roessle-Str.10, 13125, Berlin, Germany
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12
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Fontana L, Adelaiye RM, Rastelli AL, Miles KM, Ciamporcero E, Longo VD, Nguyen H, Vessella R, Pili R. Dietary protein restriction inhibits tumor growth in human xenograft models. Oncotarget 2014; 4:2451-61. [PMID: 24353195 PMCID: PMC3926840 DOI: 10.18632/oncotarget.1586] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Purpose: Data from epidemiological and experimental studies suggest that dietary protein intake may play a role in inhibiting prostate and breast cancer by modulating the IGF/AKT/mTOR pathway. In this study we investigated the effects of diets with different protein content or quality on prostate and breast cancer. Experimental Design: To test our hypothesis we assessed the inhibitory effect of protein diet restriction on prostate and breast cancer growth, serum PSA and IGF-1 concentrations, mTOR activity and epigenetic markers, by using human xenograft cancer models. Results: Our results showed a 70% inhibition of tumor growth in the castrate-resistant LuCaP23.1 prostate cancer model and a 56% inhibition in the WHIM16 breast cancer model fed with a 7% protein diet when compared to an isocaloric 21% protein diet. Inhibition of tumor growth correlated, in the LuCaP23.1 model, with decreased serum PSA and IGF-1 levels, down-regulation of mTORC1 activity, decreased cell proliferation as indicated by Ki67 staining, and reduction in epigenetic markers of prostate cancer progression, including the histone methyltransferase EZH2 and the associated histone mark H3K27me3. In addition, we observed that modifications of dietary protein quality, independently of protein quantity, decreased tumor growth. A diet containing 20% plant protein inhibited tumor weight by 37% as compared to a 20% animal dairy protein diet. Conclusions: Our findings suggest that a reduction in dietary protein intake is highly effective in inhibiting tumor growth in human xenograft prostate and breast cancer models, possibly through the inhibition of the IGF/AKT/mTOR pathway and epigenetic modifications.
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Affiliation(s)
- Luigi Fontana
- Department of Medicine, Washington University in St. Louis, MO, USA
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13
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Abstract
We have come a long way in the 55 years since Edmond Fischer and the late Edwin Krebs discovered that the activity of glycogen phosphorylase is regulated by reversible protein phosphorylation. Many of the fundamental molecular mechanisms that operate in biological signaling have since been characterized and the vast web of interconnected pathways that make up the cellular signaling network has been mapped in considerable detail. Nonetheless, it is important to consider how fast this field is still moving and the issues at the current boundaries of our understanding. One must also appreciate what experimental strategies have allowed us to attain our present level of knowledge. We summarize here some key issues (both conceptual and methodological), raise unresolved questions, discuss potential pitfalls, and highlight areas in which our understanding is still rudimentary. We hope these wide-ranging ruminations will be useful to investigators who carry studies of signal transduction forward during the rest of the 21st century.
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14
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Salazar M, Lorente M, García-Taboada E, Pérez Gómez E, Dávila D, Zúñiga-García P, María Flores J, Rodríguez A, Hegedus Z, Mosén-Ansorena D, Aransay AM, Hernández-Tiedra S, López-Valero I, Quintanilla M, Sánchez C, Iovanna JL, Dusetti N, Guzmán M, Francis SE, Carracedo A, Kiss-Toth E, Velasco G. Loss of Tribbles pseudokinase-3 promotes Akt-driven tumorigenesis via FOXO inactivation. Cell Death Differ 2014; 22:131-44. [PMID: 25168244 DOI: 10.1038/cdd.2014.133] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 07/11/2014] [Accepted: 07/24/2014] [Indexed: 01/08/2023] Open
Abstract
Tribbles pseudokinase-3 (TRIB3) has been proposed to act as an inhibitor of AKT although the precise molecular basis of this activity and whether the loss of TRIB3 contributes to cancer initiation and progression remain to be clarified. In this study, by using a wide array of in vitro and in vivo approaches, including a Trib3 knockout mouse, we demonstrate that TRIB3 has a tumor-suppressing role. We also find that the mechanism by which TRIB3 loss enhances tumorigenesis relies on the dysregulation of the phosphorylation of AKT by the mTORC2 complex, which leads to an enhanced phosphorylation of AKT on Ser473 and the subsequent hyperphosphorylation and inactivation of the transcription factor FOXO3. These observations support the notion that loss of TRIB3 is associated with a more aggressive phenotype in various types of tumors by enhancing the activity of the mTORC2/AKT/FOXO axis.
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Affiliation(s)
- M Salazar
- 1] Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University, Madrid, Spain [2] Instituto de Investigaciones Sanitarias San Carlos (IdISSC), Madrid, Spain
| | - M Lorente
- 1] Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University, Madrid, Spain [2] Instituto de Investigaciones Sanitarias San Carlos (IdISSC), Madrid, Spain
| | - E García-Taboada
- Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University, Madrid, Spain
| | - E Pérez Gómez
- 1] Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University, Madrid, Spain [2] Instituto de Investigación Hospital 12 de Octubre (I+12), Madrid, Spain
| | - D Dávila
- 1] Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University, Madrid, Spain [2] Instituto de Investigaciones Sanitarias San Carlos (IdISSC), Madrid, Spain
| | | | - J María Flores
- Department of Animal Surgery and Medicine, School of Veterinary, Complutense University, Madrid, Spain
| | - A Rodríguez
- Department of Animal Surgery and Medicine, School of Veterinary, Complutense University, Madrid, Spain
| | - Z Hegedus
- Institute of Biophysics, Hungarian Academy of Sciences, Szeged, Hungary
| | | | - A M Aransay
- CIC bioGUNE-CIBERehd, Bizkaia Technology Park, Derio, Spain
| | - S Hernández-Tiedra
- 1] Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University, Madrid, Spain [2] Instituto de Investigaciones Sanitarias San Carlos (IdISSC), Madrid, Spain
| | - I López-Valero
- 1] Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University, Madrid, Spain [2] Instituto de Investigaciones Sanitarias San Carlos (IdISSC), Madrid, Spain
| | - M Quintanilla
- Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain
| | - C Sánchez
- 1] Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University, Madrid, Spain [2] Instituto de Investigación Hospital 12 de Octubre (I+12), Madrid, Spain
| | - J L Iovanna
- Centre de Recherche en Carcérologie de Marseille (CRCM), INSERM UMR, CNRS UMR 7258, Aix Marseille Université and Institut Paoli Calmette, Marseille, France
| | - N Dusetti
- Centre de Recherche en Carcérologie de Marseille (CRCM), INSERM UMR, CNRS UMR 7258, Aix Marseille Université and Institut Paoli Calmette, Marseille, France
| | - M Guzmán
- 1] Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University, Madrid, Spain [2] Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED) and Instituto Ramón y Cajal de Investigaciones Sanitarias (IRYCIS), Madrid, Spain
| | - S E Francis
- Department of Cardiovascular Science, University of Sheffield, Sheffield, UK
| | - A Carracedo
- 1] CIC bioGUNE, Bizkaia Technology Park, Derio, Spain [2] Ikerbasque, Basque Foundation for Science, Bilbao, Spain [3] Biochemistry and Molecular Biology Department, University of the Basque Country (UPV/EHU), Bilbao, Spain
| | - E Kiss-Toth
- Department of Cardiovascular Science, University of Sheffield, Sheffield, UK
| | - G Velasco
- 1] Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University, Madrid, Spain [2] Instituto de Investigaciones Sanitarias San Carlos (IdISSC), Madrid, Spain
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15
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Shukla S, Bhaskaran N, Babcook MA, Fu P, Maclennan GT, Gupta S. Apigenin inhibits prostate cancer progression in TRAMP mice via targeting PI3K/Akt/FoxO pathway. Carcinogenesis 2013; 35:452-60. [PMID: 24067903 DOI: 10.1093/carcin/bgt316] [Citation(s) in RCA: 126] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Forkhead box O (FoxO) transcription factors play an important role as tumor suppressor in several human malignancies. Disruption of FoxO activity due to loss of phosphatase and tensin homolog and activation of phosphatidylinositol-3 kinase (PI3K)/Akt are frequently observed in prostate cancer. Apigenin, a naturally occurring plant flavone, exhibits antiproliferative and anticarcinogenic activities through mechanisms, which are not fully defined. In the present study, we show that apigenin suppressed prostate tumorigenesis in transgenic adenocarcinoma of the mouse prostate (TRAMP) mice through the PI3K/Akt/FoxO-signaling pathway. Apigenin-treated TRAMP mice (20 and 50 μg/mouse/day, 6 days/week for 20 weeks) exhibited significant decrease in tumor volumes of the prostate as well as completely abolished distant organ metastasis. Apigenin treatment resulted in significant decrease in the weight of genitourinary apparatus (P < 0.0001), dorsolateral (P < 0.0001) and ventral prostate (P < 0.028), compared with the control group. Apigenin-treated mice showed reduced phosphorylation of Akt (Ser473) and FoxO3a (Ser253), which correlated with its increased nuclear retention and decreased binding of FoxO3a with 14-3-3. These events lead to reduced proliferation as assessed by Ki-67 and cyclin D1, along with upregulation of FoxO-responsive proteins BIM and p27/Kip1. Complementing in vivo results, similar observations were noted in human prostate cancer LNCaP and PC-3 cells after apigenin treatment. Furthermore, binding of FoxO3a with p27/Kip1 was markedly increased after 10 and 20 μM apigenin treatment resulting in G0/G1-phase cell cycle arrest, which was consistent with the effects elicited by PI3K/Akt inhibitor, LY294002. These results provide convincing evidence that apigenin effectively suppressed prostate cancer progression, at least in part, by targeting the PI3K/Akt/FoxO-signaling pathway.
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Affiliation(s)
- Sanjeev Shukla
- Department of Urology, Case Western Reserve University and The Urology Institute, University Hospitals Case Medical Center, Cleveland, OH 44106, USA
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16
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Kwak MK, Johnson DT, Zhu C, Lee SH, Ye DW, Luong R, Sun Z. Conditional deletion of the Pten gene in the mouse prostate induces prostatic intraepithelial neoplasms at early ages but a slow progression to prostate tumors. PLoS One 2013; 8:e53476. [PMID: 23308230 PMCID: PMC3540073 DOI: 10.1371/journal.pone.0053476] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Accepted: 11/28/2012] [Indexed: 01/10/2023] Open
Abstract
The PTEN tumor suppressor gene is frequently inactivated in human prostate cancer. Using Osr1 (odd skipped related 1)-Cre mice, we generated a novel conditional Pten knockout mouse strain, PtenLoxP:Osr1-Cre. Conditional biallelic and monoallelic Pten knockout mice were viable. Deletion of Pten expression was detected in the prostate of PtenLoxP/LoxP:Osr1-Cre mice as early as 2 weeks of age. Intriguingly, PtenLoxP/LoxP:Osr1-Cre mice develop high-grade prostatic intraepithelial neoplasms (PINs) with high penetrance as early as one-month of age, and locally invasive prostatic tumors after 12-months of age. PtenLoxP/+:Osr1-Cre mice show only mild oncogenic changes after 8-weeks of age. Castration of PtenLoxP/LoxP:Osr1-Cre mice shows no significant regression of prostate tumors, although a shift of androgen receptor (AR) staining from the nuclei to cytoplasm is observed in Pten null tumor cells of castrated mice. Enhanced Akt activity is observed in Pten null tumor cells of castrated PtenLoxP/LoxP:Osr1-Cre. This study provides a novel mouse model that can be used to investigate a primary role of Pten in initiating oncogenic transformation in the prostate and to examine other genetic and epigenetic changes that are required for tumor progression in the mouse prostate.
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Affiliation(s)
- Mi Kyung Kwak
- Department of Urology, Stanford University School of Medicine, Stanford, California, United States of America
- Department of Genetics, Stanford University School of Medicine, Stanford, California, United States of America
| | - Daniel T. Johnson
- Department of Urology, Stanford University School of Medicine, Stanford, California, United States of America
- Department of Genetics, Stanford University School of Medicine, Stanford, California, United States of America
| | - Chunfang Zhu
- Department of Urology, Stanford University School of Medicine, Stanford, California, United States of America
- Department of Genetics, Stanford University School of Medicine, Stanford, California, United States of America
| | - Suk Hyung Lee
- Department of Urology, Stanford University School of Medicine, Stanford, California, United States of America
- Department of Genetics, Stanford University School of Medicine, Stanford, California, United States of America
| | - Ding-Wei Ye
- Department of Urology, Fudan University, Shanghai Cancer Center, Shanghai, People’s Republic of China
| | - Richard Luong
- Department of Comparative Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Zijie Sun
- Department of Urology, Stanford University School of Medicine, Stanford, California, United States of America
- Department of Genetics, Stanford University School of Medicine, Stanford, California, United States of America
- * E-mail:
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17
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Floc'h N, Kinkade CW, Kobayashi T, Aytes A, Lefebvre C, Mitrofanova A, Cardiff RD, Califano A, Shen MM, Abate-Shen C. Dual targeting of the Akt/mTOR signaling pathway inhibits castration-resistant prostate cancer in a genetically engineered mouse model. Cancer Res 2012; 72:4483-93. [PMID: 22815528 PMCID: PMC3432676 DOI: 10.1158/0008-5472.can-12-0283] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Although the prognosis for clinically localized prostate cancer is now favorable, there are still no curative treatments for castration-resistant prostate cancer (CRPC) and, therefore, it remains fatal. In this study, we investigate a new therapeutic approach for treatment of CRPC, which involves dual targeting of a major signaling pathway that is frequently deregulated in the disease. We found that dual targeting of the Akt and mTOR signaling pathways with their respective inhibitors, MK-2206 and ridaforolimus (MK-8669), is highly effective for inhibiting CRPC in preclinical studies in vivo using a refined genetically engineered mouse model of the disease. The efficacy of the combination treatment contrasts with their limited efficacy as single agents, since delivery of MK-2206 or MK-8669 individually had a modest impact in vivo on the overall tumor phenotype. In human prostate cancer cell lines, although not in the mouse model, the synergistic actions of MK-2206 and ridaforolimus (MK-8669) are due in part to limiting the mTORC2 feedback activation of Akt. Moreover, the effects of these drugs are mediated by inhibition of cellular proliferation via the retinoblastoma (Rb) pathway. Our findings suggest that dual targeting of the Akt and mTOR signaling pathways using MK-2206 and ridaforolimus (MK-8669) may be effective for treatment of CRPC, particularly for patients with deregulated Rb pathway activity.
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Affiliation(s)
- Nicolas Floc'h
- Departments of Urology and Pathology and Cell Biology, Columbia University Medical Center, New York, NY 10032
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032
| | - Carolyn Waugh Kinkade
- Departments of Urology and Pathology and Cell Biology, Columbia University Medical Center, New York, NY 10032
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032
| | - Takashi Kobayashi
- Departments of Urology and Pathology and Cell Biology, Columbia University Medical Center, New York, NY 10032
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032
| | - Alvaro Aytes
- Departments of Urology and Pathology and Cell Biology, Columbia University Medical Center, New York, NY 10032
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032
| | - Celine Lefebvre
- Department of Biomedical Informatics and Center for Computational Biology and Bioinformatics, Columbia University Medical Center, New York, NY 10032
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032
| | - Antonina Mitrofanova
- Department of Biomedical Informatics and Center for Computational Biology and Bioinformatics, Columbia University Medical Center, New York, NY 10032
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032
| | - Robert D. Cardiff
- Center for Comparative Medicine and Department of Pathology, School of Medicine, University of California, Davis 95616
| | - Andrea Califano
- Department of Biomedical Informatics and Center for Computational Biology and Bioinformatics, Columbia University Medical Center, New York, NY 10032
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032
| | - Michael M. Shen
- Departments of Medicine and Genetics & Development, Columbia University Medical Center, New York, NY 10032
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032
| | - Cory Abate-Shen
- Departments of Urology and Pathology and Cell Biology, Columbia University Medical Center, New York, NY 10032
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032
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18
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Abstract
In vitro, the tumour suppressor PTEN (phosphatase and tensin homologue deleted on chromosome 10) displays intrinsic phosphatase activity towards both protein and lipid substrates. In vivo, the lipid phosphatase activity of PTEN, through which it dephosphorylates the 3 position in the inositol sugar of phosphatidylinositol derivatives, is important for its tumour suppressor function; however, the significance of its protein phosphatase activity remains unclear. Using two-photon laser-scanning microscopy and biolistic gene delivery of GFP (green fluorescent protein)-tagged constructs into organotypic hippocampal slice cultures, we have developed an assay of PTEN function in living tissue. Using this bioassay, we have demonstrated that overexpression of wild-type PTEN led to a decrease in spine density in neurons. Furthermore, it was the protein phosphatase activity, but not the lipid phosphatase activity, of PTEN that was essential for this effect. The ability of PTEN to decrease neuronal spine density depended upon the phosphorylation status of serine and threonine residues in its C-terminal segment and the integrity of the C-terminal PDZ-binding motif. The present study reveals a new aspect of the function of this important tumour suppressor and suggest that, in addition to dephosphorylating the 3 position in phosphatidylinositol phospholipids, the critical protein substrate of PTEN may be PTEN itself.
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19
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Wang J, Kobayashi T, Floc'h N, Kinkade CW, Aytes A, Dankort D, Lefebvre C, Mitrofanova A, Cardiff RD, McMahon M, Califano A, Shen MM, Abate-Shen C. B-Raf activation cooperates with PTEN loss to drive c-Myc expression in advanced prostate cancer. Cancer Res 2012; 72:4765-76. [PMID: 22836754 DOI: 10.1158/0008-5472.can-12-0820] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Both the PI3K → Akt → mTOR and mitogen-activated protein kinase (MAPK) signaling pathways are often deregulated in prostate tumors with poor prognosis. Here we describe a new genetically engineered mouse model of prostate cancer in which PI3K-Akt-mTOR signaling is activated by inducible disruption of PTEN, and extracellular signal-regulated kinase 1/2 (ERK1/2) MAPK signaling is activated by inducible expression of a BRAF(V600E) oncogene. These tissue-specific compound mutant mice develop lethal prostate tumors that are inherently resistant to castration. These tumors bypass cellular senescence and disseminate to lymph nodes, bone marrow, and lungs where they form overt metastases in approximately 30% of the cases. Activation of PI3K → Akt → mTOR and MAPK signaling pathways in these prostate tumors cooperate to upregulate c-Myc. Accordingly, therapeutic treatments with rapamycin and PD0325901 to target these pathways, respectively, attenuate c-Myc levels and reduce tumor and metastatic burden. Together, our findings suggest a generalized therapeutic approach to target c-Myc activation in prostate cancer by combinatorial targeting of the PI3K → Akt → mTOR and ERK1/2 MAPK signaling pathways.
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Affiliation(s)
- Jingqiang Wang
- Department of Urology and Pathology and Cell Biology, Columbia University Medical Center, New York, New York 10031, USA
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20
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Aguissa-Touré AH, Li G. Genetic alterations of PTEN in human melanoma. Cell Mol Life Sci 2012; 69:1475-91. [PMID: 22076652 PMCID: PMC11114653 DOI: 10.1007/s00018-011-0878-0] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 10/13/2011] [Accepted: 10/24/2011] [Indexed: 12/31/2022]
Abstract
The PTEN gene is one of the most frequently inactivated tumor suppressor genes in sporadic cancers. Inactivating mutations and deletions of the PTEN gene are found in many types of cancers, including melanoma. However, the exact frequency of PTEN alteration in melanoma is unknown. In this study, we comprehensively reviewed 16 studies on PTEN genetic changes in melanoma cell lines and tumor biopsies. To date, 76 PTEN alterations have been reported in melanoma cell lines and 38 PTEN alterations in melanoma biopsies. The rate of PTEN alterations in melanoma cell lines, primary melanoma, and metastatic melanoma is 27.6, 7.3, and 15.2%, respectively. Three mutations were found in both melanoma cell lines and biopsies. These mutations are scattered throughout the gene, with the exception of exon 9. A mutational hot spot is found in exon 5, which encodes the phosphatase activity domain. Evidence is also presented to suggest that numerous homozygous deletions and missense variants exist in the PTEN transcript. Studying PTEN functions and implications of its mutations and other genes could provide insights into the precise nature of PTEN function in melanoma and additional targets for new therapeutic approaches.
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Affiliation(s)
- Almass-Houd Aguissa-Touré
- Department of Dermatology and Skin Science, Vancouver Coastal Health Research Institute, Jack Bell Research Centre, University of British Columbia, Vancouver, BC, Canada
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Scott JL, Musselman CA, Adu-Gyamfi E, Kutateladze TG, Stahelin RV. Emerging methodologies to investigate lipid-protein interactions. Integr Biol (Camb) 2012; 4:247-58. [PMID: 22327461 DOI: 10.1039/c2ib00143h] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Cellular membranes are composed of hundreds of different lipids, ion channels, receptors and scaffolding complexes that act as signalling and trafficking platforms for processes fundamental to life. Cellular signalling and membrane trafficking are often regulated by peripheral proteins, which reversibly interact with lipid molecules in highly regulated spatial and temporal fashions. In most cases, one or more modular lipid-binding domain(s) mediate recruitment of peripheral proteins to specific cellular membranes. These domains, of which more than 10 have been identified since 1989, harbour structurally selective lipid-binding sites. Traditional in vitro and in vivo studies have elucidated how these domains coordinate their cognate lipids and thus how the parent proteins associate with membranes. Cellular activities of peripheral proteins and subsequent physiological processes depend upon lipid binding affinities and selectivity. Thus, the development of novel sensitive and quantitative tools is essential in furthering our understanding of the function and regulation of these proteins. As this field expands into new areas such as computational biology, cellular lipid mapping, single molecule imaging, and lipidomics, there is an urgent need to integrate technologies to detail the molecular architecture and mechanisms of lipid signalling. This review surveys emerging cellular and in vitro approaches for studying protein-lipid interactions and provides perspective on how integration of methodologies directs the future development of the field.
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Affiliation(s)
- Jordan L Scott
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA
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Howitt J, Lackovic J, Low LH, Naguib A, Macintyre A, Goh CP, Callaway JK, Hammond V, Thomas T, Dixon M, Putz U, Silke J, Bartlett P, Yang B, Kumar S, Trotman LC, Tan SS. Ndfip1 regulates nuclear Pten import in vivo to promote neuronal survival following cerebral ischemia. ACTA ACUST UNITED AC 2012; 196:29-36. [PMID: 22213801 PMCID: PMC3255971 DOI: 10.1083/jcb.201105009] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
PTEN nuclear entry driven by ubiquitination is mediated by the ligase-interacting protein Ndfip1 and is essential for neuronal survival in mice after cerebral ischemia. PTEN (phosphatase and tensin homologue deleted on chromosome TEN) is the major negative regulator of phosphatidylinositol 3-kinase signaling and has cell-specific functions including tumor suppression. Nuclear localization of PTEN is vital for tumor suppression; however, outside of cancer, the molecular and physiological events driving PTEN nuclear entry are unknown. In this paper, we demonstrate that cytoplasmic Pten was translocated into the nuclei of neurons after cerebral ischemia in mice. Critically, this transport event was dependent on a surge in the Nedd4 family–interacting protein 1 (Ndfip1), as neurons in Ndfip1-deficient mice failed to import Pten. Ndfip1 binds to Pten, resulting in enhanced ubiquitination by Nedd4 E3 ubiquitin ligases. In vitro, Ndfip1 overexpression increased the rate of Pten nuclear import detected by photobleaching experiments, whereas Ndfip1−/− fibroblasts showed negligible transport rates. In vivo, Ndfip1 mutant mice suffered larger infarct sizes associated with suppressed phosphorylated Akt activation. Our findings provide the first physiological example of when and why transient shuttling of nuclear Pten occurs and how this process is critical for neuron survival.
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Affiliation(s)
- Jason Howitt
- Brain Development and Regeneration Laboratory, Florey Neuroscience Institutes, The University of Melbourne, Parkville, Victoria 3010, Australia
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Sperow M, Berry RB, Bayazitov IT, Zhu G, Baker SJ, Zakharenko SS. Phosphatase and tensin homologue (PTEN) regulates synaptic plasticity independently of its effect on neuronal morphology and migration. J Physiol 2011; 590:777-92. [PMID: 22147265 DOI: 10.1113/jphysiol.2011.220236] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The tumour suppressor PTEN is the central negative regulator of the phosphatidylinositol 3-kinase (PI3K) signalling pathway, which mediates diverse processes in various tissues. In the nervous system, the PI3K pathway modulates proliferation, migration, cellular size, synaptic transmission and plasticity. In humans, neurological abnormalities such as autism, seizures and ataxia are associated with inherited PTEN mutations. In rodents, Pten loss during early development is associated with extensive deficits in neuronal migration and substantial hypertrophy of neurons and synaptic densities; however, whether its effect on synaptic transmission and plasticity is direct or mediated by structural abnormalities remains unknown. Here we analysed neuronal and synaptic structures and function in Pten-conditional knockout mice in which the gene was deleted from excitatory neurons postnatally. Using two-photon imaging, Golgi staining, immunohistochemistry, electron microscopy, and electrophysiological tools, we determined that Pten loss does not affect hippocampus development, neuronal or synaptic structures, or basal excitatory synaptic transmission. However, it does cause deficits in both major forms of synaptic plasticity, long-term potentiation and long-term depression, of excitatory synaptic transmission. These deficits coincided with impaired spatial memory, as measured in water maze tasks. Deletion of Pdk1, which encodes a positive downstream regulator of the PI3K pathway, rescued Pten-mediated deficits in synaptic plasticity but not in spatial memory. These results suggest that PTEN independently modulates functional and structural properties of hippocampal neurons and is directly involved in mechanisms of synaptic plasticity.
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Affiliation(s)
- Margaret Sperow
- Department of Developmental Neurobiology, St Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
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Bononi A, Agnoletto C, De Marchi E, Marchi S, Patergnani S, Bonora M, Giorgi C, Missiroli S, Poletti F, Rimessi A, Pinton P. Protein kinases and phosphatases in the control of cell fate. Enzyme Res 2011; 2011:329098. [PMID: 21904669 PMCID: PMC3166778 DOI: 10.4061/2011/329098] [Citation(s) in RCA: 203] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Revised: 05/06/2011] [Accepted: 06/08/2011] [Indexed: 12/19/2022] Open
Abstract
Protein phosphorylation controls many aspects of cell fate and is often deregulated in pathological conditions. Several recent findings have provided an intriguing insight into the spatial regulation of protein phosphorylation across different subcellular compartments and how this can be finely orchestrated by specific kinases and phosphatases. In this review, the focus will be placed on (i) the phosphoinositide 3-kinase (PI3K) pathway, specifically on the kinases Akt and mTOR and on the phosphatases PP2a and PTEN, and on (ii) the PKC family of serine/threonine kinases. We will look at general aspects of cell physiology controlled by these kinases and phosphatases, highlighting the signalling pathways that drive cell division, proliferation, and apoptosis.
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Affiliation(s)
- Angela Bononi
- Section of General Pathology, Department of Experimental and Diagnostic Medicine, Interdisciplinary Center for the Study of Inflammation (ICSI) and LTTA Center, University of Ferrara, 44100 Ferrara, Italy
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Nardella C, Lunardi A, Fedele G, Clohessy JG, Alimonti A, Kozma SC, Thomas G, Loda M, Pandolfi PP. Differential expression of S6K2 dictates tissue-specific requirement for S6K1 in mediating aberrant mTORC1 signaling and tumorigenesis. Cancer Res 2011; 71:3669-75. [PMID: 21444676 DOI: 10.1158/0008-5472.can-10-3962] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The S6K1 and S6K2 kinases are considered important mTOR signaling effectors, yet their contribution to tumorigenesis remains unclear. Aberrant mTOR activation is a frequent event in cancer that commonly results from heterozygous loss of PTEN. Here, we show for the first time a differential protein expression between S6K1 and S6K2 in both mouse and human tissues. Additionally, the inactivation of S6k1 in the context of Pten heterozygosity (Pten(+/-)) suggests a differential requirement for this protein across multiple tissues. This tissue specificity appears to be governed by the relative protein expression of S6k2. Accordingly, we find that deletion of S6k1 markedly impairs Pten(+/-) mediated adrenal tumorigenesis, specifically due to low expression of S6k2. Concomitant observation of low S6K2 levels in the human adrenal gland supports the development of S6K1 inhibitors for treatment of PTEN loss-driven pheochromocytoma.
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Affiliation(s)
- Caterina Nardella
- Cancer Genetics Program, Beth Israel Deaconess Cancer Center, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02115, USA
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Carracedo A, Alimonti A, Pandolfi PP. PTEN level in tumor suppression: how much is too little? Cancer Res 2011; 71:629-33. [PMID: 21266353 DOI: 10.1158/0008-5472.can-10-2488] [Citation(s) in RCA: 192] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The importance of PTEN (phosphatase and tensin homolog located on chromosome 10) in cancer has surpassed all predictions and expectations from the time it was discovered and has qualified this gene as one of the most commonly mutated and deleted tumor suppressors in human cancer. PTEN levels are frequently found downregulated in cancer, even in the absence of genetic loss or mutation. PTEN is heavily regulated by transcription factors, microRNAs, competitive endogenous RNAs (such as the PTEN pseudogene), and methylation, whereas the tumor suppressive activity of the PTEN protein can be altered at multiple levels through aberrant phosphorylation, ubiquitination, and acetylation. These regulatory cues are presumed to play a key role in tumorigenesis through the alteration of the appropriate levels, localization, and activity of PTEN. The identification of all these levels of PTEN regulation raises, in turn, a key corollary question: How low should PTEN level(s) or activity drop in order to confer cancer susceptibility at the organismal level? Our laboratory and others have approached this question through the genetic manipulation of Pten in the mouse. This work has highlighted the exquisite and tissue-specific sensitivity to subtle reductions in Pten levels toward tumor initiation and progression with important implications for cancer prevention and therapy.
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Affiliation(s)
- Arkaitz Carracedo
- Cancer Genetics Program, Beth Israel Deaconess Cancer Center, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, USA
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