151
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Torre O, Elia D, Caminati A, Harari S. New insights in lymphangioleiomyomatosis and pulmonary Langerhans cell histiocytosis. Eur Respir Rev 2017; 26:26/145/170042. [PMID: 28954765 PMCID: PMC9488980 DOI: 10.1183/16000617.0042-2017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 07/26/2017] [Indexed: 12/15/2022] Open
Abstract
Lymphangioleiomyomatosis (LAM) and pulmonary Langerhans cell histiocytosis (PLCH) are rare diseases that lead to progressive cystic destruction of the lungs. Despite their distinctive characteristics, these diseases share several features. Patients affected by LAM or PLCH have similar radiological cystic patterns, a similar age of onset, and the possibility of extrapulmonary involvement. In this review, the recent advances in the understanding of the molecular pathogenesis, as well as the current and most promising biomarkers and therapeutic approaches, are described. Understanding of LAM/PLCH pathogenesis has improved over the past years, leading to new therapeutic approacheshttp://ow.ly/7wjR30erSJY
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Affiliation(s)
- Olga Torre
- U.O. di Pneumologia e Terapia Semi-Intensiva Respiratoria, Servizio di Fisiopatologia Respiratoria ed Emodinamica Polmonare, Ospedale San Giuseppe, MultiMedica IRCCS, Milan, Italy
| | - Davide Elia
- U.O. di Pneumologia e Terapia Semi-Intensiva Respiratoria, Servizio di Fisiopatologia Respiratoria ed Emodinamica Polmonare, Ospedale San Giuseppe, MultiMedica IRCCS, Milan, Italy
| | - Antonella Caminati
- U.O. di Pneumologia e Terapia Semi-Intensiva Respiratoria, Servizio di Fisiopatologia Respiratoria ed Emodinamica Polmonare, Ospedale San Giuseppe, MultiMedica IRCCS, Milan, Italy
| | - Sergio Harari
- U.O. di Pneumologia e Terapia Semi-Intensiva Respiratoria, Servizio di Fisiopatologia Respiratoria ed Emodinamica Polmonare, Ospedale San Giuseppe, MultiMedica IRCCS, Milan, Italy
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152
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Han J, Wysham WZ, Zhong Y, Guo H, Zhang L, Malloy KM, Dickens HK, Huh G, Lee D, Makowski L, Zhou C, Bae-Jump VL. Increased efficacy of metformin corresponds to differential metabolic effects in the ovarian tumors from obese versus lean mice. Oncotarget 2017; 8:110965-110982. [PMID: 29340030 PMCID: PMC5762298 DOI: 10.18632/oncotarget.20754] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2017] [Accepted: 08/03/2017] [Indexed: 12/21/2022] Open
Abstract
Obesity is a significant risk factor for ovarian cancer (OC) and associated with worse outcomes for this disease. We assessed the anti-tumorigenic effects of metformin in human OC cell lines and a genetically engineered mouse model of high grade serous OC under obese and lean conditions. Metformin potently inhibited growth in a dose-dependent manner in all four human OC cell lines through AMPK/mTOR pathways. Treatment with metformin resulted in G1 arrest, induction of apoptosis, reduction of invasion and decreased hTERT expression. In the K18-gT121+/-; p53fl/fl; Brca1fl/fl (KpB) mouse model, metformin inhibited tumor growth in both lean and obese mice. However, in the obese mice, metformin decreased tumor growth by 60%, whereas tumor growth was only decreased by 32% in the lean mice (p=0.003) compared to vehicle-treated mice. The ovarian tumors from obese mice had evidence of impaired mitochondrial complex 2 function and energy supplied by omega fatty acid oxidation rather than glycolysis as compared to lean mice, as assessed by metabolomic profiling. The improved efficacy of metformin in obesity corresponded with inhibition of mitochondrial complex 1 and fatty acid oxidation, and stimulation of glycolysis in only the OCs of obese versus lean mice. In conclusion, metformin had anti-tumorigenic effects in OC cell lines and the KpB OC pre-clinical mouse model, with increased efficacy in obese versus lean mice. Detected metabolic changes may underlie why ovarian tumors in obese mice have heightened susceptibility to metformin.
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Affiliation(s)
- Jianjun Han
- Department of Surgical Oncology, Shandong Cancer Hospital and Institute, Shandong Academy of Medical Sciences, Jinan, Postdoctoral Mobile Station of Tianjin Medical University, Tianjin, P.R. China.,Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of North Carolina, Chapel Hill, NC, USA
| | - Weiya Z Wysham
- Legacy Medical Group, Gynecologic Oncology, Portland, OR, USA
| | - Yan Zhong
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of North Carolina, Chapel Hill, NC, USA.,Department of Gynecologic Oncology, Linyi Cancer Hospital, Linyi, Shandong, P.R. China
| | - Hui Guo
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of North Carolina, Chapel Hill, NC, USA.,Department of Gynecologic Oncology, Shandong Cancer Hospital & Institute, Jinan, P.R. China
| | - Lu Zhang
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of North Carolina, Chapel Hill, NC, USA.,Department of Gynecologic Oncology, Shandong Cancer Hospital & Institute, Jinan, P.R. China
| | - Kim M Malloy
- Virginia Tech/Carilion Clinic, Department of Obstetrics and Gynecology, Blacksburg, VA, USA
| | - Hallum K Dickens
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of North Carolina, Chapel Hill, NC, USA
| | - Gene Huh
- Seoul National University College of Medicine, Seoul, South Korea
| | | | - Liza Makowski
- Department of Nutrition, University of North Carolina, Chapel Hill, NC, USA.,Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, USA
| | - Chunxiao Zhou
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of North Carolina, Chapel Hill, NC, USA.,Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, USA
| | - Victoria L Bae-Jump
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of North Carolina, Chapel Hill, NC, USA.,Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, USA
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153
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Figlia G, Norrmén C, Pereira JA, Gerber D, Suter U. Dual function of the PI3K-Akt-mTORC1 axis in myelination of the peripheral nervous system. eLife 2017; 6:e29241. [PMID: 28880149 PMCID: PMC5589416 DOI: 10.7554/elife.29241] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 07/31/2017] [Indexed: 01/24/2023] Open
Abstract
Myelination is a biosynthetically demanding process in which mTORC1, the gatekeeper of anabolism, occupies a privileged regulatory position. We have shown previously that loss of mTORC1 function in Schwann cells (SCs) hampers myelination. Here, we genetically disrupted key inhibitory components upstream of mTORC1, TSC1 or PTEN, in mouse SC development, adult homeostasis, and nerve injury. Surprisingly, the resulting mTORC1 hyperactivity led to markedly delayed onset of both developmental myelination and remyelination after injury. However, if mTORC1 was hyperactivated after myelination onset, radial hypermyelination was observed. At early developmental stages, physiologically high PI3K-Akt-mTORC1 signaling suppresses expression of Krox20 (Egr2), the master regulator of PNS myelination. This effect is mediated by S6K and contributes to control mechanisms that keep SCs in a not-fully differentiated state to ensure proper timing of myelination initiation. An ensuing decline in mTORC1 activity is crucial to allow myelination to start, while remaining mTORC1 activity drives myelin growth.
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Affiliation(s)
- Gianluca Figlia
- Department of BiologyInstitute of Molecular Health Sciences, Swiss Federal Institute of TechnologyZürichSwitzerland
| | - Camilla Norrmén
- Department of BiologyInstitute of Molecular Health Sciences, Swiss Federal Institute of TechnologyZürichSwitzerland
| | - Jorge A Pereira
- Department of BiologyInstitute of Molecular Health Sciences, Swiss Federal Institute of TechnologyZürichSwitzerland
| | - Daniel Gerber
- Department of BiologyInstitute of Molecular Health Sciences, Swiss Federal Institute of TechnologyZürichSwitzerland
| | - Ueli Suter
- Department of BiologyInstitute of Molecular Health Sciences, Swiss Federal Institute of TechnologyZürichSwitzerland
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154
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Kovarik JJ, Kernbauer E, Hölzl MA, Hofer J, Gualdoni GA, Schmetterer KG, Miftari F, Sobanov Y, Meshcheryakova A, Mechtcheriakova D, Witzeneder N, Greiner G, Ohradanova-Repic A, Waidhofer-Söllner P, Säemann MD, Decker T, Zlabinger GJ. Fasting metabolism modulates the interleukin-12/interleukin-10 cytokine axis. PLoS One 2017; 12:e0180900. [PMID: 28742108 PMCID: PMC5524343 DOI: 10.1371/journal.pone.0180900] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Accepted: 06/22/2017] [Indexed: 12/22/2022] Open
Abstract
A crucial role of cell metabolism in immune cell differentiation and function has been recently established. Growing evidence indicates that metabolic processes impact both, innate and adaptive immunity. Since a down-stream integrator of metabolic alterations, mammalian target of rapamycin (mTOR), is responsible for controlling the balance between pro-inflammatory interleukin (IL)-12 and anti-inflammatory IL-10, we investigated the effect of upstream interference using metabolic modulators on the production of pro- and anti-inflammatory cytokines. Cytokine release and protein expression in human and murine myeloid cells was assessed after toll-like receptor (TLR)-activation and glucose-deprivation or co-treatment with 5'-adenosine monophosphate (AMP)-activated protein kinase (AMPK) activators. Additionally, the impact of metabolic interference was analysed in an in-vivo mouse model. Glucose-deprivation by 2-deoxy-D-glucose (2-DG) increased the production of IL-12p40 and IL-23p19 in monocytes, but dose-dependently inhibited the release of anti-inflammatory IL-10. Similar effects have been observed using pharmacological AMPK activation. Consistently, an inhibition of the tuberous sclerosis complex-mTOR pathway was observed. In line with our in vitro observations, glycolysis inhibition with 2-DG showed significantly reduced bacterial burden in a Th2-prone Listeria monocytogenes mouse infection model. In conclusion, we showed that fasting metabolism modulates the IL-12/IL-10 cytokine balance, establishing novel targets for metabolism-based immune-modulation.
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Affiliation(s)
- Johannes J. Kovarik
- Institute of Immunology, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
- Department of Internal Medicine III, Clinical Division of Nephrology and Dialysis, Medical University Vienna, Vienna, Austria
| | - Elisabeth Kernbauer
- Max F. Perutz Laboratories, Department of Microbiology and Immunobiology, University of Vienna, Vienna, Austria
| | - Markus A. Hölzl
- Institute of Immunology, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Johannes Hofer
- Institute of Immunology, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
- Department of Internal Medicine III, Clinical Division of Nephrology and Dialysis, Medical University Vienna, Vienna, Austria
| | - Guido A. Gualdoni
- Institute of Immunology, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Klaus G. Schmetterer
- Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Fitore Miftari
- Institute of Immunology, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Yury Sobanov
- Department of Pathophysiology and Allergy Research, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Anastasia Meshcheryakova
- Department of Pathophysiology and Allergy Research, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Diana Mechtcheriakova
- Department of Pathophysiology and Allergy Research, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Nadine Witzeneder
- Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Georg Greiner
- Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Anna Ohradanova-Repic
- Institute of Hygiene and Applied Immunology, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Petra Waidhofer-Söllner
- Institute of Immunology, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Marcus D. Säemann
- Department of Internal Medicine III, Clinical Division of Nephrology and Dialysis, Medical University Vienna, Vienna, Austria
| | - Thomas Decker
- Max F. Perutz Laboratories, Department of Microbiology and Immunobiology, University of Vienna, Vienna, Austria
| | - Gerhard J. Zlabinger
- Institute of Immunology, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
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155
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Broecker-Preuss M, Becher-Boveleth N, Bockisch A, Dührsen U, Müller S. Regulation of glucose uptake in lymphoma cell lines by c-MYC- and PI3K-dependent signaling pathways and impact of glycolytic pathways on cell viability. J Transl Med 2017; 15:158. [PMID: 28724379 PMCID: PMC5517804 DOI: 10.1186/s12967-017-1258-9] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Accepted: 07/04/2017] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Changes in glucose and energy metabolism contribute to the altered phenotype of cancer cells and are the basis for positron emission tomography with 18F-fluoro-2-deoxy-D-glucose (FDG) to visualize tumors in vivo. The molecular background of the enhanced glucose uptake and its regulation in lymphoma cells is not fully clarified and may provide new possibilities to reverse the altered metabolism. Thus in this study we investigated regulation of glucose uptake by different signaling pathways. Furthermore, the effect of the glucose analog 2-deoxy-D-glucose (2-DG) alone and in combination with other inhibitors on cell survival was studied. METHODS An FDG uptake assay was established and uptake of FDG by lymphoma cells was determined after incubation with inhibitors of the c-MYC and the PI3K signalling pathways that are known to be activated in lymphoma cells and able to regulate glucose metabolism. Inhibitors of MAPK signalling pathways whose role in altered metabolism is still unclear were also investigated. Expression of mRNAs of the glucose transporter 1 (GLUT1), hexokinase 2 (HK2), glucose-6-phosphatase (G6Pase) and lactate dehydrogenase A (LDHA) and of the glucose metabolism-regulating micro RNAs (miRNA) miR21, -23a, -133a, -133b, -138-1 and -143 was determined by RT-PCR. Cell viability was analysed by MTT assay. RESULTS Treatment with the c-MYC inhibitor 10058-F4 and inhibitors of the PI3K/mTOR pathway diminished uptake of FDG in all three cell lines, while inhibition of MAPK pathways had no effect on glucose uptake. Expression of glycolysis-related genes and miRNAs were diminished, although to a variable degree in the three cell lines. The c-MYC inhibitor, the PI3K inhibitor LY294002, the mTOR inhibitor Rapamycin and 2-DG all diminished the number of viable cells. Interestingly, in combination with 2-DG, the c-MYC inhibitor, LY294002 and the p38 MAPK inhibitor SB203580 had synergistic effects on cell viability in all three cell lines. CONCLUSIONS c-MYC- and PI3K/mTOR-inhibitors decreased viability of the lymphoma cells and led to decreased glucose uptake, expression of glycolysis-associated genes, and glucose metabolism-regulating miRNAs. Inhibition of HK by 2-DG reduced cell numbers as a single agent and synergistically with inhibitors of other intracellular pathways. Thus, targeted inhibition of the pathways investigated here could be a strategy to suppress the glycolytic phenotype of lymphoma cells and reduce proliferation.
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Affiliation(s)
- Martina Broecker-Preuss
- Department of Nuclear Medicine, University Hospital Essen, Hufelandstr. 55, 45122, Essen, Germany. .,Department of Clinical Chemistry, University Hospital Essen, Hufelandstr. 55, 45122, Essen, Germany.
| | - Nina Becher-Boveleth
- Department of Nuclear Medicine, University Hospital Essen, Hufelandstr. 55, 45122, Essen, Germany.,Department of Hematology, University Hospital Essen, Hufelandstr. 55, 45122, Essen, Germany.,Institute of Pathology, University Hospital Essen, Hufelandstr. 55, 45122, Essen, Germany
| | - Andreas Bockisch
- Department of Nuclear Medicine, University Hospital Essen, Hufelandstr. 55, 45122, Essen, Germany
| | - Ulrich Dührsen
- Department of Hematology, University Hospital Essen, Hufelandstr. 55, 45122, Essen, Germany
| | - Stefan Müller
- Department of Nuclear Medicine, University Hospital Essen, Hufelandstr. 55, 45122, Essen, Germany
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156
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Zhuang Z, Lin J, Huang Y, Lin T, Zheng Z, Ma X. Notch 1 is a valuable therapeutic target against cell survival and proliferation in clear cell renal cell carcinoma. Oncol Lett 2017; 14:3437-3444. [PMID: 28927098 PMCID: PMC5587946 DOI: 10.3892/ol.2017.6587] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 05/11/2017] [Indexed: 12/24/2022] Open
Abstract
Notch 1 is a key component of the Notch pathway, which performs a crucial role in clear cell renal cell carcinoma (CCRCC) development. The present study aimed to investigate whether Notch 1 could serve as a potential target for CCRCC treatment. Firstly, an association analysis was performed using 52 CCRCC cases and 30 normal controls. The results indicated that Notch 1 protein expression in renal tissues was closely associated with the incidence of CCRCC. In addition, higher Notch 1 expression in CCRCC tissues was positively associated with higher tumor-node-metastasis stage and Fuhrman grade, in addition to larger tumor size. Subsequently, an in vitro study was conducted to examine the biological functions of Notch 1 in CCRCC 786-O cells through inhibiting the Notch 1 expression with Notch 1-specific small interfering RNA (siRNA). As a result, the inhibition of Notch 1 expression by increasing concentrations of Notch 1-specific siRNA dose-dependently decreased cell proliferation and increased cell apoptosis in 786-O cells. Furthermore, B-cell lymphoma-2 and procaspase-3 expression exhibited a dose-dependent decrease accompanied with a dose-dependent inactivation of the Akt/mammalian target of rapamycin (mTOR) signaling pathway in Notch 1 siRNA-treated 786-O cells. These findings demonstrated that Notch 1 was associated with CCRCC carcinogenesis and progression, the underlying mechanism of which was that Notch 1 acted as an activator for cell proliferation and a suppressor for cell apoptosis through the Akt/mTOR signaling-dependent pathway in CCRCC. In conclusion, the present study confirmed that Notch 1 is a valuable target against cell survival and proliferation in CCRCC treatment.
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Affiliation(s)
- Zhiming Zhuang
- Department of Urology, Zhangzhou Affiliated Hospital of Fujian Medical University, Zhangzhou, Fujian 363000, P.R. China
| | - Jiangui Lin
- Department of Urology, Zhangzhou Affiliated Hospital of Fujian Medical University, Zhangzhou, Fujian 363000, P.R. China
| | - Yiqun Huang
- Department of Hematology, Zhangzhou Affiliated Hospital of Fujian Medical University, Zhangzhou, Fujian 363000, P.R. China
| | - Tianqi Lin
- Department of Urology, Zhangzhou Affiliated Hospital of Fujian Medical University, Zhangzhou, Fujian 363000, P.R. China
| | - Zhouda Zheng
- Department of Urology, Zhangzhou Affiliated Hospital of Fujian Medical University, Zhangzhou, Fujian 363000, P.R. China
| | - Xudong Ma
- Department of Hematology, Zhangzhou Affiliated Hospital of Fujian Medical University, Zhangzhou, Fujian 363000, P.R. China
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157
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Pulito C, Mori F, Sacconi A, Goeman F, Ferraiuolo M, Pasanisi P, Campagnoli C, Berrino F, Fanciulli M, Ford RJ, Levrero M, Pediconi N, Ciuffreda L, Milella M, Steinberg GR, Cioce M, Muti P, Strano S, Blandino G. Metformin-induced ablation of microRNA 21-5p releases Sestrin-1 and CAB39L antitumoral activities. Cell Discov 2017; 3:17022. [PMID: 28698800 PMCID: PMC5501975 DOI: 10.1038/celldisc.2017.22] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 05/05/2017] [Accepted: 06/01/2017] [Indexed: 12/16/2022] Open
Abstract
Metformin is a commonly prescribed type II diabetes medication that exhibits promising anticancer effects. Recently, these effects were found to be associated, at least in part, with a modulation of microRNA expression. However, the mechanisms by which single modulated microRNAs mediate the anticancer effects of metformin are not entirely clear and knowledge of such a process could be vital to maximize the potential therapeutic benefits of this safe and well-tolerated therapy. Our analysis here revealed that the expression of miR-21-5p was downregulated in multiple breast cancer cell lines treated with pharmacologically relevant doses of metformin. Interestingly, the inhibition of miR-21-5p following metformin treatment was also observed in mouse breast cancer xenografts and in sera from 96 breast cancer patients. This modulation occurred at the levels of both pri-miR-21 and pre-miR-21, suggesting transcriptional modulation. Antagomir-mediated ablation of miR-21-5p phenocopied the effects of metformin on both the clonogenicity and migration of the treated cells, while ectopic expression of miR-21-5p had the opposite effect. Mechanistically, this reduction in miR-21-5p enhanced the expression of critical upstream activators of the AMP-activated protein kinase, calcium-binding protein 39-like and Sestrin-1, leading to AMP-activated protein kinase activation and inhibition of mammalian target of rapamycin signaling. Importantly, these effects of metformin were synergistic with those of everolimus, a clinically relevant mammalian target of rapamycin inhibitor, and were independent of the phosphatase and tensin homolog status. This highlights the potential relevance of metformin in combinatorial settings for the treatment of breast cancer.
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Affiliation(s)
- Claudio Pulito
- Molecular Chemoprevention Unit, Italian National Cancer Institute ‘Regina Elena’, Rome, Italy
| | - Federica Mori
- Molecular Chemoprevention Unit, Italian National Cancer Institute ‘Regina Elena’, Rome, Italy
| | - Andrea Sacconi
- Oncogenomic and Epigenetic Unit, Italian National Cancer Institute ‘Regina Elena’, Rome, Italy
| | - Frauke Goeman
- Oncogenomic and Epigenetic Unit, Italian National Cancer Institute ‘Regina Elena’, Rome, Italy
| | - Maria Ferraiuolo
- Molecular Chemoprevention Unit, Italian National Cancer Institute ‘Regina Elena’, Rome, Italy
| | - Patrizia Pasanisi
- Department of Preventive & Predictive Medicine, Fondazione IRCCS Istituto Nazionale Dei Tumori, Milan, Italy
| | - Carlo Campagnoli
- Unit of Endocrinological Gynecology, Ospedale Sant’Anna di Torino, Turin, Italy
| | - Franco Berrino
- Department of Preventive & Predictive Medicine, Fondazione IRCCS Istituto Nazionale Dei Tumori, Milan, Italy
| | | | - Rebecca J Ford
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Massimo Levrero
- Epigénétique et Épigénomique des Carcinomes Hépathocellulaires Viro-Induits du Centre de Recherche en Cancérologie de Lyon, Lyon, France
| | - Natalia Pediconi
- Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy
| | - Ludovica Ciuffreda
- Division of Medical Oncology A, Italian National Cancer Institute ‘Regina Elena’, Rome, Italy
| | - Michele Milella
- Division of Medical Oncology A, Italian National Cancer Institute ‘Regina Elena’, Rome, Italy
| | - Gregory R Steinberg
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Mario Cioce
- Oncogenomic and Epigenetic Unit, Italian National Cancer Institute ‘Regina Elena’, Rome, Italy
| | - Paola Muti
- Department of Oncology, Juravinski Cancer Center, McMaster University, Hamilton, Ontario, Canada
| | - Sabrina Strano
- Molecular Chemoprevention Unit, Italian National Cancer Institute ‘Regina Elena’, Rome, Italy
- Department of Oncology, Juravinski Cancer Center, McMaster University, Hamilton, Ontario, Canada
| | - Giovanni Blandino
- Oncogenomic and Epigenetic Unit, Italian National Cancer Institute ‘Regina Elena’, Rome, Italy
- Department of Oncology, Juravinski Cancer Center, McMaster University, Hamilton, Ontario, Canada
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158
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Insulin regulates titin pre-mRNA splicing through the PI3K-Akt-mTOR kinase axis in a RBM20-dependent manner. Biochim Biophys Acta Mol Basis Dis 2017; 1863:2363-2371. [PMID: 28676430 DOI: 10.1016/j.bbadis.2017.06.023] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 06/25/2017] [Accepted: 06/29/2017] [Indexed: 12/13/2022]
Abstract
Titin, a giant sarcomeric protein, is largely responsible for the diastolic properties of the heart. It has two major isoforms, N2B and N2BA due to pre-mRNA splicing regulated mainly by a splicing factor RNA binding motif 20 (RBM20). Mis-splicing of titin pre-mRNA in response to external stimuli may lead to altered ratio of N2B to N2BA, and thus, impaired cardiac contractile function. However, little is known about titin alternative splicing in response to external stimuli. Here, we reported the detailed mechanisms of titin alternative splicing in response to insulin. Insulin treatment in cultured neonatal rat cardiomyocytes (NRCMs) activated the PI3K-Akt-mTOR kinase axis, leading to increased N2B expression in the presence of RBM20, but not in NRCMs in the absence of RBM20. By inhibiting this kinase axis with inhibitors, decreased N2B isoform was observed in NRCMs and also in diabetic rat model treated with streptozotocin, but not in NRCMs and diabetic rats in the absence of RBM20. In addition to the alteration of titin isoform ratios in response to insulin, we found that RBM20 expression was increased in NRCMs with insulin treatment, suggesting that RBM20 levels were also regulated by insulin-induced kinase axis. Further, knockdown of p70S6K1 with siRNA reduced both RBM20 and N2B levels, while knockdown of 4E-BP1 elevated expression levels of RBM20 and N2B. These findings reveal a major signal transduction pathway for insulin-induced titin alternative splicing, and place RBM20 in a central position in the pathway, which is consistent with the reputed role of RBM20 in titin alternative splicing. Findings from this study shed light on gene therapeutic strategies at the molecular level by correction of pre-mRNA mis-splicing.
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159
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Zhang Z, Wang M. PI3K/AKT/mTOR pathway in pulmonary carcinoid tumours. Oncol Lett 2017; 14:1373-1378. [PMID: 28789352 PMCID: PMC5529984 DOI: 10.3892/ol.2017.6331] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 03/17/2017] [Indexed: 12/16/2022] Open
Abstract
The present study examined the expression of mammalian target of rapamycin (mTOR) and mutations in the phosphoinositide 3-kinase (PI3K)/AKT/mTOR pathway in 54 patients with typical carcinoid tumours (TC) or atypical carcinoid tumours (AC). In total, 54 bronchopulmonary neuroendocrine tumour (NET) surgical specimens, consisting of 17 TC, 8 AC, 17 large-cell neuroendocrine carcinoma (LCNEC), and 12 small-cell lung carcinoma (SCLC) samples, were tested for mTOR by immunohistochemistry, and 104 exon sites were tested in the PI3K/AKT/mTOR pathway by nested polymerase chain reaction. It was found that the positive rates for mTOR expression in TC/AC and LCNEC/SCLC were 60 (15/25) and 55.2% (16/29), respectively. In total, 4 missense mutations were found in 3 patients with TC/AC, including mutations in exon 48 of mTOR (c.6667C>T), exon 21 of tuberous sclerosis complex (TSC) 1 (c.2765G>A), and exons 12 (c.1265C>T) and 19 (c.2148C>T) of TSC2. To the best of our knowledge, mutations in exon 48 of mTOR and exon 21 of TSC1 have not been previously reported. Tissues from patients with single mutations exhibited strong positive mTOR immunohistochemical staining, and tissues from patients with double mutations were weakly positive. The same mutations were not observed in SCLC or LCNEC. In conclusion, gene mutations were observed and an association between the gene mutations and mTOR expression were indicated in the PI3K/AKT/mTOR pathway in TC/AC tumours. Those mutations may be driver genes and treatment targets.
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Affiliation(s)
- Zixuan Zhang
- Division of Respiratory Medicine, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, P.R. China
| | - Mengzhao Wang
- Division of Respiratory Medicine, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, P.R. China
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160
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Kaur A, Sharma S. Mammalian target of rapamycin (mTOR) as a potential therapeutic target in various diseases. Inflammopharmacology 2017; 25:293-312. [PMID: 28417246 DOI: 10.1007/s10787-017-0336-1] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Accepted: 03/02/2017] [Indexed: 12/28/2022]
Abstract
Mammalian target of rapamycin (mTOR) is a serine/threonine protein kinase that belongs to Phosphatidylinositol-3-kinase related kinase superfamily. The signaling pathways of mTOR are integrated through the protein complexes of mTORC1 and mTORC2. mTORC1 controls protein synthesis, cell growth, proliferation, autophagy, cell metabolism, and stress responses, whereas mTORC2 seems to regulate cell survival and polarity. Dysregulation of the mTOR pathway has been implicated in the pathophysiology of a number of disease conditions, including cancer, cardiovascular, neurodegenerative, and various renal diseases. The hyperactivation of the mTOR pathway leads to increase in cell growth and proliferation and also has been documented to stimulate tumor growth. Therefore, investigation of the involvement of mTOR and its downstream pathways in various diseases intensively preoccupied scientific community. The present review is focussed on recent advances in the understanding of the mTOR signaling pathway and its role in health and various diseases.
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Affiliation(s)
- Avileen Kaur
- Cardiovascular Division, Department of Pharmacology, I. S. F. College of Pharmacy, Moga, Punjab, 142001, India
| | - Saurabh Sharma
- Cardiovascular Division, Department of Pharmacology, I. S. F. College of Pharmacy, Moga, Punjab, 142001, India.
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161
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Stafstrom CE, Staedtke V, Comi AM. Epilepsy Mechanisms in Neurocutaneous Disorders: Tuberous Sclerosis Complex, Neurofibromatosis Type 1, and Sturge-Weber Syndrome. Front Neurol 2017; 8:87. [PMID: 28367137 PMCID: PMC5355446 DOI: 10.3389/fneur.2017.00087] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 02/24/2017] [Indexed: 01/27/2023] Open
Abstract
Neurocutaneous disorders are multisystem diseases affecting skin, brain, and other organs. Epilepsy is very common in the neurocutaneous disorders, affecting up to 90% of patients with tuberous sclerosis complex (TSC) and Sturge–Weber syndrome (SWS), for example. The mechanisms underlying the increased predisposition to brain hyperexcitability differ between disorders, yet some molecular pathways overlap. For instance, the mechanistic target of rapamycin (mTOR) signaling cascade plays a central role in seizures and epileptogenesis in numerous acquired and genetic disorders, including several neurocutaneous disorders. Potential routes for target-specific treatments are emerging as the genetic and molecular pathways involved in neurocutaneous disorders become increasingly understood. This review explores the clinical features and mechanisms of epilepsy in three common neurocutaneous disorders—TSC, neurofibromatosis type 1, and SWS.
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Affiliation(s)
- Carl E Stafstrom
- Division of Pediatric Neurology, Department of Neurology, Johns Hopkins University School of Medicine , Baltimore, MD , USA
| | - Verena Staedtke
- Division of Pediatric Neurology, Department of Neurology, Johns Hopkins University School of Medicine , Baltimore, MD , USA
| | - Anne M Comi
- Department of Neurology, Kennedy Krieger Institute, Johns Hopkins University School of Medicine , Baltimore, MD , USA
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162
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Somatic Mutations in TSC1 and TSC2 Cause Focal Cortical Dysplasia. Am J Hum Genet 2017; 100:454-472. [PMID: 28215400 DOI: 10.1016/j.ajhg.2017.01.030] [Citation(s) in RCA: 128] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Accepted: 01/23/2017] [Indexed: 12/18/2022] Open
Abstract
Focal cortical dysplasia (FCD) is a major cause of the sporadic form of intractable focal epilepsies that require surgical treatment. It has recently been reported that brain somatic mutations in MTOR account for 15%-25% of FCD type II (FCDII), characterized by cortical dyslamination and dysmorphic neurons. However, the genetic etiologies of FCDII-affected individuals who lack the MTOR mutation remain unclear. Here, we performed deep hybrid capture and amplicon sequencing (read depth of 100×-20,012×) of five important mTOR pathway genes-PIK3CA, PIK3R2, AKT3, TSC1, and TSC2-by using paired brain and saliva samples from 40 FCDII individuals negative for MTOR mutations. We found that 5 of 40 individuals (12.5%) had brain somatic mutations in TSC1 (c.64C>T [p.Arg22Trp] and c.610C>T [p.Arg204Cys]) and TSC2 (c.4639G>A [p.Val1547Ile]), and these results were reproducible on two different sequencing platforms. All identified mutations induced hyperactivation of the mTOR pathway by disrupting the formation or function of the TSC1-TSC2 complex. Furthermore, in utero CRISPR-Cas9-mediated genome editing of Tsc1 or Tsc2 induced the development of spontaneous behavioral seizures, as well as cytomegalic neurons and cortical dyslamination. These results show that brain somatic mutations in TSC1 and TSC2 cause FCD and that in utero application of the CRISPR-Cas9 system is useful for generating neurodevelopmental disease models of somatic mutations in the brain.
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163
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Yang B, Zhao S. Polydatin regulates proliferation, apoptosis and autophagy in multiple myeloma cells through mTOR/p70s6k pathway. Onco Targets Ther 2017; 10:935-944. [PMID: 28243129 PMCID: PMC5317338 DOI: 10.2147/ott.s123398] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND Polydatin (PD) plays an important role in suppressing platelet aggregation, reducing blood lipid, restoring microcirculation and protecting from myocardial ischemia/reperfusion injury and shock. In addition, PD possesses anticancer activity. However, the effect and the mechanism of PD in regulating multiple myeloma (MM) cell survival and death are still unknown. METHODS Cell proliferation and apoptosis of RPMI 8226 cells, respectively, were analyzed by cell counting kit8 (CCK-8) assay and flow cytometry. The levels of caspase-3, cleaved caspase-3, caspase-9, cleaved caspase-9, Bcl-2 and Bax were analyzed by Western blot. Autophagy induced by PD was investigated by detecting the levels of Beclin 1, Atg5, LC3I, LC3II, HSP70 and HSP27. The autophagy inhibitor 3-methyladenine (3-MA), mTOR/p70s6k inhibitor rapamycin, and mTOR activator MHY1485 were used to analyze the mechanism of cell proliferation, apoptosis and autophagy influenced by PD. The phosphorylations of mTOR and p70s6k were detected by Western blot. RESULTS A gradual decrease in cell proliferation of RPMI 8226 cells was observed with an increase in PD concentrations (P<0.05). PD also induced cell apoptosis and autophagy in a concentration-dependent manner. Both 3-MA and MHY1485 reversed the inhibitory effect of PD on cell proliferation and attenuated the positive effect of PD on cell apoptosis and autophagy. The phosphorylation of mTOR and p70s6k was significantly suppressed by PD (P<0.05). Furthermore, inhibition of the mTOR/p70s6k signaling pathway by rapamycin significantly induced autophagy and apoptosis and inhibited cell viability (P<0.05). CONCLUSION PD effectively suppressed cell proliferation and induced apoptosis and autophagy of MM cells via the mTOR/p70s6k signaling pathway in a concentration-dependent manner in vitro, indicating that PD could be a potential anticancer drug for MM therapy.
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Affiliation(s)
- Baojun Yang
- Department of Pathology, General Hospital of PINGMEISHENMA Medical Group, Pingdingshan
| | - Shunxin Zhao
- Department of Respiratory Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, People's Republic of China
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164
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Shawky NM, Segar L. Sulforaphane inhibits platelet-derived growth factor-induced vascular smooth muscle cell proliferation by targeting mTOR/p70S6kinase signaling independent of Nrf2 activation. Pharmacol Res 2017; 119:251-264. [PMID: 28212891 DOI: 10.1016/j.phrs.2017.02.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 12/27/2016] [Accepted: 02/08/2017] [Indexed: 12/30/2022]
Abstract
Activation of nuclear factor erythroid 2-related factor 2 (Nrf2, a transcription factor) and/or inhibition of mammalian target of rapamycin (mTOR) are implicated in the suppression of vascular smooth muscle cell (VSMC) proliferation. The present study has examined the likely regulatory effects of sulforaphane (SFN, an antioxidant) on Nrf2 activation and platelet-derived growth factor (PDGF)-induced mTOR signaling in VSMCs. Using human aortic VSMCs, nuclear extraction and siRNA-mediated downregulation studies were performed to determine the role of Nrf2 on SFN regulation of PDGF-induced proliferative signaling. Immunoprecipitation and/or immunoblot studies were carried out to determine how SFN regulates PDGF-induced mTOR/p70S6K/S6 versus ERK and Akt signaling. Immunohistochemical analysis was performed to determine SFN regulation of S6 phosphorylation in the injured mouse femoral artery. SFN (5μM) inhibits PDGF-induced activation of mTOR without affecting mTOR association with raptor in VSMCs. While SFN inhibits PDGF-induced phosphorylation of p70S6K and 4E-BP1 (downstream targets of mTOR), it does not affect ERK or Akt phosphorylation. In addition, SFN diminishes exaggerated phosphorylation of S6 ribosomal protein (a downstream target of p70S6K) in VSMCs in vitro and in the neointimal layer of injured artery in vivo. Although SFN promotes Nrf2 accumulation to upregulate cytoprotective genes (e.g., heme oxygenase-1 and thioredoxin-1), downregulation of endogenous Nrf2 by target-specific siRNA reveals an Nrf2-independent effect for SFN-mediated inhibition of mTOR/p70S6K/S6 signaling and suppression of VSMC proliferation. Strategies that utilize local delivery of SFN at the lesion site may limit restenosis after angioplasty by targeting mTOR/p70S6K/S6 axis in VSMCs independent of Nrf2 activation.
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Affiliation(s)
- Noha M Shawky
- Center for Pharmacy and Experimental Therapeutics, University of Georgia College of Pharmacy, Augusta, GA, USA; Charlie Norwood VA Medical Center, Augusta, GA, USA; Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Lakshman Segar
- Center for Pharmacy and Experimental Therapeutics, University of Georgia College of Pharmacy, Augusta, GA, USA; Charlie Norwood VA Medical Center, Augusta, GA, USA; Vascular Biology Center, Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA, USA; Department of Medicine, Pennsylvania State University College of Medicine, Hershey, PA, USA.
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165
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Resistance to mTORC1 Inhibitors in Cancer Therapy: From Kinase Mutations to Intratumoral Heterogeneity of Kinase Activity. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:1726078. [PMID: 28280521 PMCID: PMC5322438 DOI: 10.1155/2017/1726078] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 01/22/2017] [Indexed: 01/19/2023]
Abstract
Targeting mTORC1 has been thoroughly explored in cancer therapy. Following encouraging preclinical studies, mTORC1 inhibitors however failed to provide substantial benefits in cancer patients. Several resistance mechanisms have been identified including mutations of mTOR and activation of alternate proliferation pathways. Moreover, emerging evidence discloses intratumoral heterogeneity of mTORC1 activity that further contributes to a reduced anticancer efficacy of mTORC1 inhibitors. Genetic heterogeneity as well as heterogeneous conditions of the tumor environment such as hypoxia profoundly modifies mTORC1 activity in tumors and hence influences the response of tumors to mTORC1 inhibitors. Intriguingly, the heterogeneity of mTORC1 activity also occurs towards its substrates at the single cell level, as mutually exclusive pattern of activation of mTORC1 downstream effectors has been reported in tumors. After briefly describing mTORC1 biology and the use of mTORC1 inhibitors in patients, this review will give an overview on concepts of resistance to mTORC1 inhibition in cancer with a particular focus on intratumoral heterogeneity of mTORC1 activity.
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166
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The Journey of the Autophagosome through Mammalian Cell Organelles and Membranes. J Mol Biol 2017; 429:497-514. [DOI: 10.1016/j.jmb.2016.12.013] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 12/08/2016] [Accepted: 12/10/2016] [Indexed: 12/30/2022]
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167
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Lei Y, Yi Y, Liu Y, Liu X, Keller ET, Qian CN, Zhang J, Lu Y. Metformin targets multiple signaling pathways in cancer. CHINESE JOURNAL OF CANCER 2017; 36:17. [PMID: 28126011 PMCID: PMC5270304 DOI: 10.1186/s40880-017-0184-9] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Accepted: 06/21/2016] [Indexed: 12/20/2022]
Abstract
Metformin, an inexpensive and well-tolerated oral agent commonly used in the first-line treatment of type 2 diabetes, has become the focus of intense research as a candidate anticancer agent. Here, we discuss the potential of metformin in cancer therapeutics, particularly its functions in multiple signaling pathways, including AMP-activated protein kinase, mammalian target of rapamycin, insulin-like growth factor, c-Jun N-terminal kinase/mitogen-activated protein kinase (p38 MAPK), human epidermal growth factor receptor-2, and nuclear factor kappaB pathways. In addition, cutting-edge targeting of cancer stem cells by metformin is summarized.
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Affiliation(s)
- Yong Lei
- Key Laboratory of Longevity and Ageing-related Diseases, Ministry of Education, Nanning, 530021, Guangxi, P. R. China.,Center for Translational Medicine, Guangxi Medical University, 14th Floor, Pharmacology and Biomedical Sciences Building, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, P. R. China
| | - Yanhua Yi
- School for International Education, Guangxi Medical University, Nanning, 530021, Guangxi, P. R. China
| | - Yang Liu
- Key Laboratory of Longevity and Ageing-related Diseases, Ministry of Education, Nanning, 530021, Guangxi, P. R. China.,Center for Translational Medicine, Guangxi Medical University, 14th Floor, Pharmacology and Biomedical Sciences Building, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, P. R. China
| | - Xia Liu
- Key Laboratory of Longevity and Ageing-related Diseases, Ministry of Education, Nanning, 530021, Guangxi, P. R. China.,Center for Translational Medicine, Guangxi Medical University, 14th Floor, Pharmacology and Biomedical Sciences Building, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, P. R. China
| | - Evan T Keller
- Department of Urology and Pathology, School of Medicine, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Chao-Nan Qian
- Department of Nasopharyngeal Carcinoma, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, P. R. China
| | - Jian Zhang
- Key Laboratory of Longevity and Ageing-related Diseases, Ministry of Education, Nanning, 530021, Guangxi, P. R. China. .,Center for Translational Medicine, Guangxi Medical University, 14th Floor, Pharmacology and Biomedical Sciences Building, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, P. R. China. .,Department of Urology and Pathology, School of Medicine, University of Michigan, Ann Arbor, MI, 48109, USA.
| | - Yi Lu
- Key Laboratory of Longevity and Ageing-related Diseases, Ministry of Education, Nanning, 530021, Guangxi, P. R. China. .,Center for Translational Medicine, Guangxi Medical University, 14th Floor, Pharmacology and Biomedical Sciences Building, No. 22 Shuangyong Road, Nanning, 530021, Guangxi, P. R. China.
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168
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Biswal BN, Das SN, Das BK, Rath R. Alteration of cellular metabolism in cancer cells and its therapeutic prospects. J Oral Maxillofac Pathol 2017; 21:244-251. [PMID: 28932034 PMCID: PMC5596675 DOI: 10.4103/jomfp.jomfp_60_17] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Transformation of a normal cell into a cancerous phenotype is essentially backed by genetic mutations that trigger several oncogenic signaling pathways. These signaling pathways rewire the cellular metabolism to meet the bioenergetic and biomass requirement of proliferating cell, which is different from a quiescent cell. Although the change of metabolism in a cancer cell was observed and studied in the mid-20th century, it was not adequate to explain oncogenesis. Now, equipped with a revolution of oncogenes, we have a genetic basis to explain the transformation. Through several studies, it is clear now that such metabolic alterations not only promote cancer progression but also contribute to the chemoresistance of cancer. Targeting specific enzymes and combinations of enzymes can improve the efficacy of cancer therapy and help to overcome the therapeutic resistance.
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Affiliation(s)
- Biranchi Narayan Biswal
- Department of Oral Pathology and Microbiology, S.C.B. Dental College and Hospital, Cuttack, Odisha, India
| | - Surya Narayan Das
- Department of Oral Pathology and Microbiology, S.C.B. Dental College and Hospital, Cuttack, Odisha, India
| | - Bijoy Kumar Das
- Department of Oral Pathology and Microbiology, S.C.B. Dental College and Hospital, Cuttack, Odisha, India
| | - Rachna Rath
- Department of Oral Pathology and Microbiology, S.C.B. Dental College and Hospital, Cuttack, Odisha, India
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169
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Caban C, Khan N, Hasbani DM, Crino PB. Genetics of tuberous sclerosis complex: implications for clinical practice. APPLICATION OF CLINICAL GENETICS 2016; 10:1-8. [PMID: 28053551 PMCID: PMC5189696 DOI: 10.2147/tacg.s90262] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Tuberous sclerosis complex (TSC) is a multisystem disorder that results from heterozygous mutations in either TSC1 or TSC2. The primary organ systems that are affected include the brain, skin, lung, kidney, and heart, all with variable frequency, penetrance, and severity. Neurological features include epilepsy, autism, and intellectual disability. There are more than 1,500 known pathogenic variants for TSC1 and TSC2, including deletion, nonsense, and missense mutations, and all pathogenic mutations are inactivating, leading to loss of function effects on the encoded proteins TSC1 and TSC2. These proteins form a complex to constitutively inhibit mechanistic target of rapamycin (mTOR) signaling cascade, and as a consequence, mTOR signaling is constitutively active within all TSC-associated lesions. The mTOR inhibitors rapamycin (sirolimus) and everolimus have been shown to reduce the size of renal and brain lesions and improve pulmonary function in TSC, and these compounds may also decrease seizure frequency. The clinical application of mTOR inhibitors in TSC has provided one of the first examples of precision medicine in a neurodevelopmental disorder.
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Affiliation(s)
- Carolina Caban
- Department of Neurology; Shriners Hospitals Pediatric Research Center, Temple University School of Medicine
| | - Nubaira Khan
- Department of Neurology; Shriners Hospitals Pediatric Research Center, Temple University School of Medicine
| | - Daphne M Hasbani
- Department of Neurology, St. Christopher's Hospital for Children, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Peter B Crino
- Department of Neurology; Shriners Hospitals Pediatric Research Center, Temple University School of Medicine
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170
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Wang X, Yang X, Li Y, Wang X, Zhang Y, Dai X, Niu B, Wu J, Yuan X, Xiong A, Liu Z, Zhong N, Wu M, Li G. Lyn kinase represses mucus hypersecretion by regulating IL-13-induced endoplasmic reticulum stress in asthma. EBioMedicine 2016; 15:137-149. [PMID: 28024734 PMCID: PMC5233819 DOI: 10.1016/j.ebiom.2016.12.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 12/15/2016] [Accepted: 12/16/2016] [Indexed: 12/25/2022] Open
Abstract
In asthma, mucus hypersecretion is thought to be a prominent pathological feature associated with widespread mucus plugging. However, the current treatments for mucus hypersecretion are often ineffective or temporary. The potential therapeutic targets of mucus hypersecretion in asthma remain unknown. Here, we show that Lyn is a central effector of endoplasmic reticulum stress (ER stress) and mucous hypersecretion in asthma. In Lyn-transgenic mice (Lyn-TG) and wild-type (WT) C57BL/6J mice exposed to ovalbumin (OVA), Lyn overexpression attenuates mucus hypersecretion and ER stress. Interleukin 13 (IL-13) induced MUC5AC expression by enhancing ER stress in vitro. Lyn serves as a negative regulator of IL-13-induced ER stress and MUC5AC expression. We further find that an inhibitor of ER stress, which is likely involved in the PI3K p85α/Akt pathway and NFκB activity, blocked MUC5AC expression in Lyn-knockdown cells. Furthermore, PI3K/Akt signaling is required for IL-13-induced ER stress and MUC5AC expression in airway epithelial cells. The ER stress regulation of MUC5AC expression depends on NFκB in Lyn-knockdown airway epithelial cells. Our studies indicate not only a concept of mucus hypersecretion in asthma that involves Lyn kinase but also an important therapeutic candidate for asthma.
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Affiliation(s)
- Xing Wang
- Inflammation & Allergic Diseases Research Unit, Affiliated Hospital of Southwest Medical University, Luzhou 646000, Sichuan, China
| | - Xiaoqiong Yang
- Inflammation & Allergic Diseases Research Unit, Affiliated Hospital of Southwest Medical University, Luzhou 646000, Sichuan, China
| | - Yin Li
- The First Clinic College, Chongqing Medical University, Chongqing 401331, China
| | - Xiaoyun Wang
- Inflammation & Allergic Diseases Research Unit, Affiliated Hospital of Southwest Medical University, Luzhou 646000, Sichuan, China
| | - Yun Zhang
- State Key Laboratory of Quality Research in Chinese Medicine, Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macao, China
| | - Xi Dai
- State Key Laboratory of Quality Research in Chinese Medicine, Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macao, China
| | - Bin Niu
- Inflammation & Allergic Diseases Research Unit, Affiliated Hospital of Southwest Medical University, Luzhou 646000, Sichuan, China
| | - Juan Wu
- First Department of Respiratory Disease, Affiliated Hospital of Southwest Medical University, Luzhou 646000, Sichuan, China
| | - Xiefang Yuan
- Inflammation & Allergic Diseases Research Unit, Affiliated Hospital of Southwest Medical University, Luzhou 646000, Sichuan, China
| | - Anjie Xiong
- Inflammation & Allergic Diseases Research Unit, Affiliated Hospital of Southwest Medical University, Luzhou 646000, Sichuan, China
| | - Zhigang Liu
- Inflammation & Allergic Diseases Research Unit, Affiliated Hospital of Southwest Medical University, Luzhou 646000, Sichuan, China; State Key Laboratories of Respiratory Disease, Ghuangzhou Medical University, Guangdong 510120, China
| | - Nanshan Zhong
- State Key Laboratories of Respiratory Disease, Ghuangzhou Medical University, Guangdong 510120, China.
| | - Min Wu
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, 1301 N Columbia Rd, Grand Forks, ND 58203-9037, United States.
| | - Guoping Li
- Inflammation & Allergic Diseases Research Unit, Affiliated Hospital of Southwest Medical University, Luzhou 646000, Sichuan, China; First Department of Respiratory Disease, Affiliated Hospital of Southwest Medical University, Luzhou 646000, Sichuan, China.
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171
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Zhang C, Liu J, Jin N, Zhang G, Xi Y, Liu H. SiRNA Targeting mTOR Effectively Prevents the Proliferation and Migration of Human Lens Epithelial Cells. PLoS One 2016; 11:e0167349. [PMID: 27911920 PMCID: PMC5135089 DOI: 10.1371/journal.pone.0167349] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 11/12/2016] [Indexed: 12/14/2022] Open
Abstract
Posterior capsule opacification (PCO) is the most common complication that causes visual decrease after extracapsular cataract surgery. The primary cause of PCO formation is the proliferation of the residual lens epithelial cells (LECs). The mammalian target of rapamycin (mTOR) plays an important role in the growth and migration of LECs. In the current study, we used small interfering RNA (siRNA) to specifically attenuate mTOR in human lens epithelial B3 cells (HLE B3). We aimed to examine the effect of mTOR-siRNA on the proliferation, migration and epithelial-to-mesenchymal transition (EMT) of HLE B3 cells and explore the underlying mechanisms. The mTOR-siRNA was transfected into HLE B3 cells using lipofectamine 2000. The mRNA and protein levels of mTOR were examined to confirm the efficiency of mTOR-siRNA. The levels of mRNA and protein as well as the activity of mTOR down-stream effectors p70 ribosomal protein S6 kinase (p70S6K) and protein kinase B (PKB, AKT) were examined using real-time PCR or Western blot, respectively. The cell proliferation was determined using cell counting kit (CCK) 8 and cell growth curve assay. The cell migration was examined using Transwell system and Scratch assay. MTOR-siRNA effectively eliminated mTOR mRNA and protein. The proliferation and migration were significantly suppressed by mTOR-siRNA transfection. mTOR-siRNA reduced the mRNA of p70S6K and AKT in a time-dependent manner. Furthermore, the phosphorylation of p70S6K and AKT was decreased by mTOR-siRNA. MTOR-siRNA also eliminated the formation of mTORC1 and mTORC2 protein complex and blocked the transforming growth factor (TGF)-β-induced EMT. Our results suggested that mTOR-siRNA could effectively inhibit the proliferation, migration and EMT of HLE B3 cells through the inhibition of p70S6K and AKT. These results indicated that mTOR-siRNA might be an effective agent inhibiting HLE cells growth and EMT following cataract surgery and provide an alternative therapy for preventing PCO.
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Affiliation(s)
- Chunmei Zhang
- Department of Ophthalmology, the First Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
| | - Jingjing Liu
- Department of Ophthalmology, the First Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
| | - Na Jin
- Department of Ophthalmology, the First Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
| | - Guiming Zhang
- Department of Ophthalmology, No.2 Hospital of Xiamen, Fujian, P.R. China
| | - Yahui Xi
- Department of Ophthalmology, the First Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
| | - Hongling Liu
- Department of Ophthalmology, the First Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
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172
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Kuwagata S, Kume S, Chin-Kanasaki M, Araki H, Araki S, Nakazawa J, Sugaya T, Koya D, Haneda M, Maegawa H, Uzu T. MicroRNA148b-3p inhibits mTORC1-dependent apoptosis in diabetes by repressing TNFR2 in proximal tubular cells. Kidney Int 2016; 90:1211-1225. [DOI: 10.1016/j.kint.2016.06.036] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 06/26/2016] [Accepted: 06/30/2016] [Indexed: 11/24/2022]
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173
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4.4 Å Resolution Cryo-EM structure of human mTOR Complex 1. Protein Cell 2016; 7:878-887. [PMID: 27909983 PMCID: PMC5205667 DOI: 10.1007/s13238-016-0346-6] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 11/11/2016] [Indexed: 11/30/2022] Open
Abstract
Mechanistic target of rapamycin (mTOR) complex 1 (mTORC1) integrates signals from growth factors, cellular energy levels, stress and amino acids to control cell growth and proliferation through regulating translation, autophagy and metabolism. Here we determined the cryo-electron microscopy structure of human mTORC1 at 4.4 Å resolution. The mTORC1 comprises a dimer of heterotrimer (mTOR-Raptor-mLST8) mediated by the mTOR protein. The complex adopts a hollow rhomboid shape with 2-fold symmetry. Notably, mTORC1 shows intrinsic conformational dynamics. Within the complex, the conserved N-terminal caspase-like domain of Raptor faces toward the catalytic cavity of the kinase domain of mTOR. Raptor shows no caspase activity and therefore may bind to TOS motif for substrate recognition. Structural analysis indicates that FKBP12-Rapamycin may generate steric hindrance for substrate entry to the catalytic cavity of mTORC1. The structure provides a basis to understand the assembly of mTORC1 and a framework to characterize the regulatory mechanism of mTORC1 pathway.
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174
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Liu W, Guo J, Mu J, Tian L, Zhou D. Rapamycin Protects Sepsis-Induced Cognitive Impairment in Mouse Hippocampus by Enhancing Autophagy. Cell Mol Neurobiol 2016; 37:1195-1205. [DOI: 10.1007/s10571-016-0449-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 11/23/2016] [Indexed: 12/17/2022]
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175
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Gunji-Niitsu Y, Kumasaka T, Kitamura S, Hoshika Y, Hayashi T, Tokuda H, Morita R, Kobayashi E, Mitani K, Kikkawa M, Takahashi K, Seyama K. Benign clear cell "sugar" tumor of the lung in a patient with Birt-Hogg-Dubé syndrome: a case report. BMC MEDICAL GENETICS 2016; 17:85. [PMID: 27871249 PMCID: PMC5117512 DOI: 10.1186/s12881-016-0350-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 11/15/2016] [Indexed: 12/14/2022]
Abstract
Background Birt-Hogg-Dubé (BHD) syndrome is a rare inherited autosomal genodermatosis and caused by germline mutation of the folliculin (FLCN) gene, a tumor suppressor gene of which protein product is involved in mechanistic target of rapamycin (mTOR) signaling pathway regulating cell growth and metabolism. Clinical manifestations in BHD syndrome is characterized by fibrofolliculomas of the skin, pulmonary cysts with or without spontaneous pneumothorax, and renal neoplasms. There has been no pulmonary neoplasm reported in BHD syndrome, although the condition is due to deleterious sequence variants in a tumor suppressor gene. Here we report, for the first time to our knowledge, a patient with BHD syndrome who was complicated with a clear cell “sugar” tumor (CCST) of the lung, a benign tumor belonging to perivascular epithelioid cell tumors (PEComas) with frequent causative relation to tuberous sclerosis complex 1 (TSC1) or 2 (TSC2) gene. Case presentation In a 38-year-old Asian woman, two well-circumscribed nodules in the left lung and multiple thin-walled, irregularly shaped cysts on the basal and medial area of the lungs were disclosed by chest roentgenogram and computer-assisted tomography (CT) during a preoperative survey for a bilateral faucial tonsillectomy. Analysis of the resected tumor showed large polygonal cells with clear cytoplasm proliferating in a solid pattern. Immunohistochemistry revealed that these tumor cells were positive for microphthalmia-transcription factor, S100, and CD1a but negative for HMB45, indicating that the tumor was a CCST. Genetic testing indicated that the patient had a germline mutation on exon 12 of the FLCN gene, i.e., insertion of 7 nucleotides (CCACCCT) (c.1347_1353dupCCACCCT). Direct sequencing of the FLCN exon 12 using genomic DNA obtained from her microdissected CCST cells clearly revealed loss of the wild-type FLCN sequence, which confirmed complete functional loss of the FLCN gene. On the other hand, no loss of heterozygosity around TCS1- or TSC2-associated genetic region was demonstrated. Conclusion To our knowledge, this is the first report of CCST of the lung in a patient with BHDS, indicating that CCST should be added to the spectrum of pulmonary manifestations of BHDS.
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Affiliation(s)
- Yoko Gunji-Niitsu
- Divisions of Respiratory Medicine, Juntendo University Faculty of Medicine and Graduate School of Medicine, 3-1-3, Hongo, Bunkyo-Ku, Tokyo, 113-8431, Japan.,The Study Group of Pneumothorax and Cystic Lung Diseases, 4-8-1 Seta, Setagaya-Ku, Tokyo, 158-0095, Japan
| | - Toshio Kumasaka
- Department of Pathology, Japanese Red Cross Medical Center, 4-1-22, Hiroo, Shibuya-Ku, Tokyo, 150-8935, Japan.,The Study Group of Pneumothorax and Cystic Lung Diseases, 4-8-1 Seta, Setagaya-Ku, Tokyo, 158-0095, Japan
| | - Shigehiro Kitamura
- Departments of Pathology, JCHO Tokyo Yamate Medical Center, 3-22-1 Hyakunin-cho, Shinjuku-Ku, Tokyo, 169-0073, Japan
| | - Yoshito Hoshika
- Divisions of Respiratory Medicine, Juntendo University Faculty of Medicine and Graduate School of Medicine, 3-1-3, Hongo, Bunkyo-Ku, Tokyo, 113-8431, Japan.,The Study Group of Pneumothorax and Cystic Lung Diseases, 4-8-1 Seta, Setagaya-Ku, Tokyo, 158-0095, Japan
| | - Takuo Hayashi
- Human Pathology, Juntendo University Faculty of Medicine and Graduate School of Medicine, 3-1-3, Hongo, Bunkyo-Ku, Tokyo, 113-8431, Japan.,The Study Group of Pneumothorax and Cystic Lung Diseases, 4-8-1 Seta, Setagaya-Ku, Tokyo, 158-0095, Japan
| | - Hitoshi Tokuda
- Respiratory Medicine, JCHO Tokyo Yamate Medical Center, 3-22-1 Hyakunin-cho, Shinjuku-Ku, Tokyo, 169-0073, Japan
| | - Riichiro Morita
- Thoracic Surgery, JCHO Tokyo Yamate Medical Center, 3-22-1 Hyakunin-cho, Shinjuku-Ku, Tokyo, 169-0073, Japan
| | - Etsuko Kobayashi
- Divisions of Respiratory Medicine, Juntendo University Faculty of Medicine and Graduate School of Medicine, 3-1-3, Hongo, Bunkyo-Ku, Tokyo, 113-8431, Japan.,The Study Group of Pneumothorax and Cystic Lung Diseases, 4-8-1 Seta, Setagaya-Ku, Tokyo, 158-0095, Japan
| | - Keiko Mitani
- Human Pathology, Juntendo University Faculty of Medicine and Graduate School of Medicine, 3-1-3, Hongo, Bunkyo-Ku, Tokyo, 113-8431, Japan.,The Study Group of Pneumothorax and Cystic Lung Diseases, 4-8-1 Seta, Setagaya-Ku, Tokyo, 158-0095, Japan
| | - Mika Kikkawa
- Laboratory of Proteomics and Biomolecular Science, Biomedical Research Center, Juntendo University Faculty of Medicine and Graduate School of Medicine, 3-1-3, Hongo, Bunkyo-Ku, Tokyo, 113-8431, Japan
| | - Kazuhisa Takahashi
- Divisions of Respiratory Medicine, Juntendo University Faculty of Medicine and Graduate School of Medicine, 3-1-3, Hongo, Bunkyo-Ku, Tokyo, 113-8431, Japan
| | - Kuniaki Seyama
- Divisions of Respiratory Medicine, Juntendo University Faculty of Medicine and Graduate School of Medicine, 3-1-3, Hongo, Bunkyo-Ku, Tokyo, 113-8431, Japan. .,The Study Group of Pneumothorax and Cystic Lung Diseases, 4-8-1 Seta, Setagaya-Ku, Tokyo, 158-0095, Japan.
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Li S, Wang Z, Huang J, Cheng S, Du H, Che G, Peng Y. Clinicopathological and prognostic significance of mTOR and phosphorylated mTOR expression in patients with esophageal squamous cell carcinoma: a systematic review and meta-analysis. BMC Cancer 2016; 16:877. [PMID: 27835987 PMCID: PMC5106813 DOI: 10.1186/s12885-016-2940-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 10/28/2016] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Mammalian target of rapamycin (mTOR) is a serine/threonine protein kinase responsible for regulating ribosomal biogenesis and protein synthesis. Dysregulation of mTOR contributes to tumorigenesis, angiogenesis, cellular growth and metastasis but its roles in esophageal squamous cell carcinoma (ESCC) are controversial. Therefore, the objective of this study is to evaluate the prognostic and clinicopathological significance of mTOR/p-mTOR expression in ESCC. METHODS Literature retrieval was conducted by searching PubMed, EMBASE and the Web of Science for full-text papers that met our eligibility criteria. Odds ratio (OR) and hazard ratio (HR) with 95 % confidence interval (CI) served as the appropriate summarized statistics for assessments of clinicopathological and prognostic significance, respectively. Cochrane Q-test and I2-statistic were adopted to estimate the heterogeneity level between studies. Potential publication bias was detected by Begg's test and Egger's test. RESULTS A total of 915 ESCC patients from nine original articles were included into this meta-analysis. The pooled analyses suggested that mTOR/p-mTOR expression was significantly correlated with the unfavorable outcomes of differentiation degree (OR: 2.63; 95 % CI: 1.71-4.05; P = 0.001), tumor invasion (OR: 1.48; 95 % CI: 1.02-2.13; P = 0.037), TNM stage (OR: 2.25; 95 % CI: 1.05-4.82; P = 0.037) and lymph node metastasis (OR: 1.82; 95 % CI: 1.06-3.11; P = 0.029), but had no significant relationship to the genders (OR: 0.81; 95 % CI: 0.50-1.32; P = 0.396). Moreover, mTOR/p-mTOR expression could independently predict the worse overall survival (HR: 2.04; 95 % CI: 1.58-2.62; P < 0.001), disease-free survival (HR: 2.39; 95 % CI: 1.64-3.49; P < 0.001) and cancer-specific survival (HR: 1.62; 95 % CI: 1.18-2.23; P = 0.003) of patients with ESCC. Such prognostic value of mTOR was not substantially altered by further subgroup analyses. CONCLUSIONS Positive expression of mTOR and p-mTOR was significantly associated with the unfavorable conditions on the depth of tumor invasion, TNM stage, differentiation degree and lymph node metastasis. mTOR and p-mTOR could serve as a valuable predictor for the poor prognosis of ESCC. More high-quality worldwide studies performing a multivariate analysis based on larger sample size are urgently required for further verifying and modifying our findings in the future.
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Affiliation(s)
- Shuangjiang Li
- Department of Thoracic Surgery, West China Hospital, Sichuan University, Guoxue Alley No. 37, Chengdu, China.,State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Guoxue Alley No. 37, Chengdu, China
| | - Zhiqiang Wang
- Department of Thoracic Surgery, West China Hospital, Sichuan University, Guoxue Alley No. 37, Chengdu, China
| | - Jian Huang
- Department of Thoracic Surgery, West China Hospital, Sichuan University, Guoxue Alley No. 37, Chengdu, China
| | - Shan Cheng
- Department of Sonography, West China Hospital, Sichuan University, Guoxue Alley No. 37, Chengdu, China
| | - Heng Du
- Department of Thoracic Surgery, West China Hospital, Sichuan University, Guoxue Alley No. 37, Chengdu, China
| | - Guowei Che
- Department of Thoracic Surgery, West China Hospital, Sichuan University, Guoxue Alley No. 37, Chengdu, China.
| | - Yong Peng
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Guoxue Alley No. 37, Chengdu, China.
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177
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Wang Q, Tang Y, Yu H, Yin Q, Li M, Shi L, Zhang W, Li D, Li L. CCL18 from tumor-cells promotes epithelial ovarian cancer metastasis via mTOR signaling pathway. Mol Carcinog 2016; 55:1688-1699. [PMID: 26457987 PMCID: PMC5057350 DOI: 10.1002/mc.22419] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 09/08/2015] [Accepted: 09/18/2015] [Indexed: 12/13/2022]
Abstract
CCL18 is a chemotactic cytokine involved in the pathogenesis and progression of various disorders, including cancer. Previously, our results showed high levels of CCL18 in the serum of epithelial ovarian carcinoma patients suggesting its potential as a circulating biomarker. In this study, we determined that CCL18 expression was up-regulated in ovarian carcinoma compared with adjacent tissue and was expressed in carcinoma cells in the tumor and not in normal ovarian epithelial cells by laser capture microdissection coupled with real-time RT-PCR. Moreover, correlation analysis showed that the CCL18 level was positively correlated with the metastasis of patients with ovarian cancer. Survival analysis also revealed that an increased level of CCL18 was associated with worse survival time in ovarian cancer patients. Over-expression of CCL18 led to enhanced migration and invasion of the Skov3 ovarian cancer cell line in vitro and in vivo. Finally, proteomics analysis demonstrated that CCL18-mediated ovarian cancer invasiveness was strongly correlated with the mTORC2 pathway. These findings suggest that the CCL18 chemokine has an important role in chemokine-mediated tumor metastasis, and may serve as a potential predictor for poor survival outcomes for ovarian cancer. © 2015 The Authors. Molecular Carcinogenesis published by Wiley Periodicals, Inc.
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Affiliation(s)
- Qi Wang
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University, Nanning, Gaungxi, China
| | - Yong Tang
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University, Nanning, Gaungxi, China
| | - Hongjing Yu
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University, Nanning, Gaungxi, China
| | - Qiaoyun Yin
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University, Nanning, Gaungxi, China
| | - Mengdi Li
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University, Nanning, Gaungxi, China
| | - Lijun Shi
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University, Nanning, Gaungxi, China
| | - Wei Zhang
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University, Nanning, Gaungxi, China
| | - Danrong Li
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University, Nanning, Gaungxi, China
| | - Li Li
- Research Department, Affiliated Cancer Hospital of Guangxi Medical University, Nanning, Gaungxi, China.
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178
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Chauhan A, Semwal DK, Mishra SP, Goyal S, Marathe R, Semwal RB. Combination of mTOR and MAPK Inhibitors-A Potential Way to Treat Renal Cell Carcinoma. Med Sci (Basel) 2016; 4:medsci4040016. [PMID: 29083380 PMCID: PMC5635794 DOI: 10.3390/medsci4040016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 09/17/2016] [Accepted: 10/10/2016] [Indexed: 12/19/2022] Open
Abstract
Renal cell carcinoma (RCC) is the most common neoplasm that occurs in the kidney and is marked by a unique biology, with a long history of poor response to conventional cancer treatments. In the past few years, there have been significant advancements to understand the biology of RCC. This has led to the introduction of novel targeted therapies in the management of patients with metastatic disease. Patients treated with targeted therapies for RCC had shown positive impact on overall survival, however, no cure is possible and patients need to undergo treatment for long periods of time, which raises challenges to manage the associated adverse events. Moreover, many patients may not respond to it and even response may not last long enough in the responders. Many inhibitors of the Mammalian target of Rapamycin (mTOR) signaling pathway are currently being used in treatment of advanced RCC. Studies showed that inhibitions of mTOR pathways induce Mitogen-Activated Protein Kinase (MAPK) escape cell death and cells become resistant to mTOR inhibitors. Because of this, there is a need to inhibit both pathways with their inhibitors comparatively for a better outcome and treatment of patients with RCC.
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Affiliation(s)
- Ashutosh Chauhan
- Department of Urology, Postgraduate Institute of Medical Education & Research, Chandigarh 160012, India.
- Department of Biotechnology, Faculty of Biomedical Sciences, Uttarakhand Ayurved University, Harrawala, Dehradun 248001, Uttarakhand, India.
| | - Deepak Kumar Semwal
- Department of Phytochemistry, Faculty of Biomedical Sciences, Uttarakhand Ayurved University, Harrawala, Dehradun 248001, Uttarakhand, India.
| | - Satyendra Prasad Mishra
- Vice Chancellor, Uttarakhand Ayurved University, Harrawala, Dehradun 248001, Uttarakhand, India.
| | - Sandeep Goyal
- Department of Hepatology, Postgraduate Institute of Medical Education & Research, Chandigarh 160012, India.
| | - Rajendra Marathe
- Department of Pediatrics, Postgraduate Institute of Medical Education & Research, Chandigarh 160012, India.
| | - Ruchi Badoni Semwal
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria 0001, South Africa.
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179
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Sang Y, Yan F, Ren X. The role and mechanism of CRL4 E3 ubiquitin ligase in cancer and its potential therapy implications. Oncotarget 2016; 6:42590-602. [PMID: 26460955 PMCID: PMC4767455 DOI: 10.18632/oncotarget.6052] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 09/23/2015] [Indexed: 12/21/2022] Open
Abstract
CRLs (Cullin-RING E3 ubiquitin ligases) are the largest E3 ligase family in eukaryotes, which ubiquitinate a wide range of substrates involved in cell cycle regulation, signal transduction, transcriptional regulation, DNA damage response, genomic integrity, tumor suppression and embryonic development. CRL4 E3 ubiquitin ligase, as one member of CRLs family, consists of a RING finger domain protein, cullin4 (CUL4) scaffold protein and DDB1–CUL4 associated substrate receptors. The CUL4 subfamily includes two members, CUL4A and CUL4B, which share extensively sequence identity and functional redundancy. Aberrant expression of CUL4 has been found in a majority of tumors. Given the significance of CUL4 in cancer, understanding its detailed aspects of pathogenesis of human malignancy would have significant value for the treatment of cancer. Here, the work provides an overview to address the role of CRL4 E3 ubiquitin ligase in cancer development and progression, and discuss the possible mechanisms of CRL4 ligase involving in many cellular processes associated with tumor. Finally, we discuss its potential value in cancer therapy.
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Affiliation(s)
- Youzhou Sang
- Department of Immunology, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China.,National Clinical Research Center of Cancer, Tianjin, China.,Key Laboratory of Cancer Immunology and Biotherapy, Tianjin, China
| | - Fan Yan
- Department of Immunology, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China.,National Clinical Research Center of Cancer, Tianjin, China.,Key Laboratory of Cancer Immunology and Biotherapy, Tianjin, China
| | - Xiubao Ren
- Department of Biotherapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China.,National Clinical Research Center of Cancer, Tianjin, China.,Key Laboratory of Cancer Immunology and Biotherapy, Tianjin, China
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180
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Ntsapi C, Loos B. Caloric restriction and the precision-control of autophagy: A strategy for delaying neurodegenerative disease progression. Exp Gerontol 2016; 83:97-111. [DOI: 10.1016/j.exger.2016.07.014] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2016] [Revised: 07/18/2016] [Accepted: 07/25/2016] [Indexed: 01/07/2023]
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181
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Risk of cancer in patients with polycystic kidney disease: a propensity-score matched analysis of a nationwide, population-based cohort study. Lancet Oncol 2016; 17:1419-1425. [DOI: 10.1016/s1470-2045(16)30250-9] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 06/06/2016] [Accepted: 06/15/2016] [Indexed: 12/29/2022]
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182
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Ivanova D, Zhelev Z, Aoki I, Bakalova R, Higashi T. Overproduction of reactive oxygen species - obligatory or not for induction of apoptosis by anticancer drugs. Chin J Cancer Res 2016; 28:383-96. [PMID: 27647966 PMCID: PMC5018533 DOI: 10.21147/j.issn.1000-9604.2016.04.01] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Many studies demonstrate that conventional anticancer drugs elevate intracellular level of reactive oxygen species (ROS) and alter redox-homeostasis of cancer cells. It is widely accepted that anticancer effect of these chemotherapeutics is due to induction of oxidative stress and ROS-mediated apoptosis in cancer. On the other hand, the harmful side effects of conventional anticancer chemotherapy are also due to increased production of ROS and disruption of redox-homeostasis of normal cells and tissues. This article describes the mechanisms for triggering and modulation of apoptosis through ROS-dependent and ROS-independent pathways. We try to answer the question: "Is it possible to induce highly specific apoptosis only in cancer cells, without overproduction of ROS, as well as without harmful effects on normal cells and tissues?" The review also suggests a new therapeutic strategy for selective killing of cancer cells, without significant impact on viability of normal cells and tissues, by combining anticancer drugs with redox-modulators, affecting specific signaling pathways and avoiding oxidative stress.
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Affiliation(s)
- Donika Ivanova
- Medical Faculty, Trakia University, Stara Zagora 6000, Bulgaria
| | - Zhivko Zhelev
- Medical Faculty, Trakia University, Stara Zagora 6000, Bulgaria; Institute of Biophysics & Biomedical Engineering, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
| | - Ichio Aoki
- Department of Molecular Imaging and Theranostics, National Institute of Radiological Sciences, National Institute for Quantum and Radiological Science and Technology, Chiba 263-8555, Japan
| | - Rumiana Bakalova
- Department of Molecular Imaging and Theranostics, National Institute of Radiological Sciences, National Institute for Quantum and Radiological Science and Technology, Chiba 263-8555, Japan; Medical Faculty, Sofia University, Sofia 1407, Bulgaria
| | - Tatsuya Higashi
- Department of Molecular Imaging and Theranostics, National Institute of Radiological Sciences, National Institute for Quantum and Radiological Science and Technology, Chiba 263-8555, Japan
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183
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Wang Z, Wang Z, Zhou Z, Ren Y. Crucial genes associated with diabetic nephropathy explored by microarray analysis. BMC Nephrol 2016; 17:128. [PMID: 27613243 PMCID: PMC5016939 DOI: 10.1186/s12882-016-0343-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 09/01/2016] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND This study sought to investigate crucial genes correlated with diabetic nephropathy (DN), and their potential functions, which might contribute to a better understanding of DN pathogenesis. METHODS The microarray dataset GSE1009 was downloaded from Gene Expression Omnibus, including 3 diabetic glomeruli samples and 3 healthy glomeruli samples. The differentially expressed genes (DEGs) were identified by LIMMA package. Their potential functions were then analyzed by the GO and KEGG pathway enrichment analyses using the DAVID database. Furthermore, miRNAs and transcription factors (TFs) regulating DEGs were predicted by the GeneCoDis tool, and miRNA-DEG-TF regulatory network was visualized by Cytoscape. Additionally, the expression of DEGs was validated using another microarray dataset GSE30528. RESULTS Totally, 14 up-regulated DEGs and 430 down-regulated ones were identified. Some DEGs (e.g. MTSS1, CALD1 and ACTN4) were markedly relative to cytoskeleton organization. Besides, some other ones were correlated with arrhythmogenic right ventricular cardiomyopathy (e.g. ACTN4, CTNNA1 and ITGB5), as well as complement and coagulation cascades (e.g. C1R and C1S). Furthermore, a series of miRNAs and TFs modulating DEGs were identified. The transcription factor LEF1 regulated the majority of DEGs, such as ITGB5, CALD1 and C1S. Hsa-miR-33a modulated 28 genes, such as C1S. Additionally, 143 DEGs (one upregulated gene and 142 downregulated genes) were also differentially expressed in another dataset GSE30528. CONCLUSIONS The genes involved in cytoskeleton organization, cardiomyopathy, as well as complement and coagulation cascades may be closely implicated in the progression of DN, via the regulation of miRNAs and TFs.
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Affiliation(s)
- Zhikui Wang
- Department of Nephrology, Linyi People's Hospital, No.27 Jiefang Road, Lanshan District, Linyi, Shandong, 276003, China
| | - Zhaoxia Wang
- Department of Nephrology, Linyi People's Hospital, No.27 Jiefang Road, Lanshan District, Linyi, Shandong, 276003, China.
| | - Zhongqi Zhou
- Department of Nephrology, Linyi People's Hospital, No.27 Jiefang Road, Lanshan District, Linyi, Shandong, 276003, China
| | - Yueqin Ren
- Department of Nephrology, Linyi People's Hospital, No.27 Jiefang Road, Lanshan District, Linyi, Shandong, 276003, China
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184
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Jenkins D, McCuaig C, Drolet BA, Siegel D, Adams S, Lawson JA, Wargon O. Tuberous Sclerosis Complex Associated with Vascular Anomalies or Overgrowth. Pediatr Dermatol 2016; 33:536-42. [PMID: 27470532 DOI: 10.1111/pde.12946] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
BACKGROUND Dysregulation of the mammalian target of rapamycin pathway is the underlying pathogenic mechanism in tuberous sclerosis complex (TSC). Other syndromes caused by genetic alterations in this pathway frequently manifest as vascular anomalies or asymmetric overgrowth. Rarely, these features have been documented in TSC. OBJECTIVE To collate cases of TSC with vascular anomaly or overgrowth that have been published and to assemble additional recent cases, as this finding has been underreported. METHODS TSC cases from three pediatric dermatology referral centers on two continents were reviewed to identify individuals noted to have hemihypertrophy or vascular anomalies. RESULTS We report five additional cases of TSC associated with vascular anomalies or overgrowth that contribute to our understanding of some of the pathways and treatments involved in vascular anomalies. CONCLUSION Hemihypertrophy and vascular anomalies may be more frequent in the setting of TSC than previously appreciated. A common pathogenetic mechanism may tie these manifestations together.
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Affiliation(s)
- David Jenkins
- Dermatology Department, John Hunter Hospital, New Lambton, New South Wales, Australia.
| | - Catherine McCuaig
- Department of Pediatric Dermatology, Dermatology Service, CHU Sainte-Justine, University of Montreal, Montreal, Quebec, Canada
| | - Beth A Drolet
- Department of Dermatology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Dawn Siegel
- Department of Dermatology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Susan Adams
- Sydney Children's Hospital, Randwick, New South Wales, Australia
| | - John A Lawson
- Sydney Children's Hospital, Randwick, New South Wales, Australia
| | - Orli Wargon
- Sydney Children's Hospital, Randwick, New South Wales, Australia.,University of New South Wales, Randwick, New South Wales, Australia
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185
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Abdel-Aziz AK, Mantawy EM, Said RS, Helwa R. The tyrosine kinase inhibitor, sunitinib malate, induces cognitive impairment in vivo via dysregulating VEGFR signaling, apoptotic and autophagic machineries. Exp Neurol 2016; 283:129-41. [PMID: 27288242 DOI: 10.1016/j.expneurol.2016.06.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Revised: 05/14/2016] [Accepted: 06/06/2016] [Indexed: 01/29/2023]
Abstract
Chemobrain refers to a cluster of cognitive deficits which affects almost 4-75% of chemotherapy-treated cancer patients. Sunitinib, an FDA-approved multityrosine kinase inhibitor, is currently used in treating different types of tumors. Despite being regarded as targeted therapy which blunts sustained angiogenesis in cancer milieu through inhibiting vascular endothelial growth factor receptor 2 (VEGFR2) signaling, the latter has a cardinal role in cognition. Recent clinical reports warned that sunitinib adversely affected memory processing in cancer patients. Nevertheless, the underlying mechanisms have not been investigated yet. Hence, we explored the impact of a clinically relevant dose of sunitinib on memory processing in vivo and questioned the implication of VEGFR2 signaling, autophagy and apoptosis. Strikingly, sunitinib preferentially impaired spatial cognition as evidenced in Morris water maze, T-maze and passive avoidance task. Consistently, sunitinib degenerated cortical and hippocampal neurons as assessed by histopathological examination and toluidine blue staining. Ultrastructural examination also depicted chromatin condensation, mitochondrial damage and accumulated autophagosomes. Digging deeper, central VEGF/VEGFR2/mTOR signaling was robustly suppressed. Besides, sunitinib boosted cortical and hippocampal p53 and executioner caspase-3 and decreased nuclear factor kappa B and Bcl-2 levels promoting apoptotic cell death. It also profoundly impeded neuronal autophagic flux as shown by decreased beclin-1 and Atg5 and increased p62/SQTSM1 levels. To our knowledge, this is the first study to provide molecular insights into sunitinib-induced chemofog where impeded VEGFR2 signaling and autophagic and hyperactivated apoptotic machineries act in neurodegenerative concert. Importantly, our findings shed light on potential therapeutic strategies to be exploited in the management of sunitinib-induced chemobrain.
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Affiliation(s)
- Amal Kamal Abdel-Aziz
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt.
| | - Eman M Mantawy
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
| | - Riham Soliman Said
- National Center for Radiation Research and Technology, Atomic Energy Authority, Cairo, Egypt
| | - Reham Helwa
- Zoology Department, Faculty of Science, Ain Shams University, Cairo, Egypt
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186
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Herbel C, Patsoukis N, Bardhan K, Seth P, Weaver JD, Boussiotis VA. Clinical significance of T cell metabolic reprogramming in cancer. Clin Transl Med 2016; 5:29. [PMID: 27510264 PMCID: PMC4980327 DOI: 10.1186/s40169-016-0110-9] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 07/15/2016] [Indexed: 02/06/2023] Open
Abstract
Conversion of normal cells to cancer is accompanied with changes in their metabolism. During this conversion, cell metabolism undergoes a shift from oxidative phosphorylation to aerobic glycolysis, also known as Warburg effect, which is a hallmark for cancer cell metabolism. In cancer cells, glycolysis functions in parallel with the TCA cycle and other metabolic pathways to enhance biosynthetic processes and thus support proliferation and growth. Similar metabolic features are observed in T cells during activation but, in contrast to cancer, metabolic transitions in T cells are part of a physiological process. Currently, there is intense interest in understanding the cause and effect relationship between metabolic reprogramming and T cell differentiation. After the recent success of cancer immunotherapy, the crosstalk between immune system and cancer has come to the forefront of clinical and basic research. One of the key goals is to delineate how metabolic alterations of cancer influence metabolism-regulated function and differentiation of tumor resident T cells and how such effects might be altered by immunotherapy. Here, we review the unique metabolic features of cancer, the implications of cancer metabolism on T cell metabolic reprogramming during antigen encounters, and the translational prospective of harnessing metabolism in cancer and T cells for cancer therapy.
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Affiliation(s)
- Christoph Herbel
- Division of Hematology-Oncology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, 02215, USA
| | - Nikolaos Patsoukis
- Division of Hematology-Oncology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, 02215, USA
| | - Kankana Bardhan
- Division of Hematology-Oncology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, 02215, USA
| | - Pankaj Seth
- Division of Hematology-Oncology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, 02215, USA.,Beth Israel Deaconess Cancer Center, Harvard Medical School, 330 Brookline Avenue, Dana 513, Boston, MA, 02215, USA.,Division of Interdisciplinary Medicine and Biotechnology, Beth Israel Deaconess Medical Center, Boston, USA
| | - Jessica D Weaver
- Division of Hematology-Oncology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, 02215, USA
| | - Vassiliki A Boussiotis
- Division of Hematology-Oncology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, 02215, USA. .,Beth Israel Deaconess Cancer Center, Harvard Medical School, 330 Brookline Avenue, Dana 513, Boston, MA, 02215, USA.
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187
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Mohammad DK, Ali RH, Turunen JJ, Nore BF, Smith CIE. B Cell Receptor Activation Predominantly Regulates AKT-mTORC1/2 Substrates Functionally Related to RNA Processing. PLoS One 2016; 11:e0160255. [PMID: 27487157 PMCID: PMC4972398 DOI: 10.1371/journal.pone.0160255] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 07/16/2016] [Indexed: 12/19/2022] Open
Abstract
Protein kinase B (AKT) phosphorylates numerous substrates on the consensus motif RXRXXpS/T, a docking site for 14-3-3 interactions. To identify novel AKT-induced phosphorylation events following B cell receptor (BCR) activation, we performed proteomics, biochemical and bioinformatics analyses. Phosphorylated consensus motif-specific antibody enrichment, followed by tandem mass spectrometry, identified 446 proteins, containing 186 novel phosphorylation events. Moreover, we found 85 proteins with up regulated phosphorylation, while in 277 it was down regulated following stimulation. Up regulation was mainly in proteins involved in ribosomal and translational regulation, DNA binding and transcription regulation. Conversely, down regulation was preferentially in RNA binding, mRNA splicing and mRNP export proteins. Immunoblotting of two identified RNA regulatory proteins, RBM25 and MEF-2D, confirmed the proteomics data. Consistent with these findings, the AKT-inhibitor (MK-2206) dramatically reduced, while the mTORC-inhibitor PP242 totally blocked phosphorylation on the RXRXXpS/T motif. This demonstrates that this motif, previously suggested as an AKT target sequence, also is a substrate for mTORC1/2. Proteins with PDZ, PH and/or SH3 domains contained the consensus motif, whereas in those with an HMG-box, H15 domains and/or NF-X1-zinc-fingers, the motif was absent. Proteins carrying the consensus motif were found in all eukaryotic clades indicating that they regulate a phylogenetically conserved set of proteins.
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Affiliation(s)
- Dara K. Mohammad
- Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Karolinska Hospital Huddinge, SE-141 86 Huddinge-Stockholm, Sweden
- Department of Biology, College of Science, University of Salahaddin, 44002 Erbil, Kurdistan Region-Iraq
- * E-mail: ; (DKM); (CIES)
| | - Raja H. Ali
- KTH Royal Institute of Technology, Swedish e-Science Research Center, Science for Life Laboratory, School of Computer Science and Communication, SE-171 77 Solna, Sweden
| | - Janne J. Turunen
- Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Karolinska Hospital Huddinge, SE-141 86 Huddinge-Stockholm, Sweden
| | - Beston F. Nore
- Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Karolinska Hospital Huddinge, SE-141 86 Huddinge-Stockholm, Sweden
- Department of Biochemistry, School of Medicine, University of Sulaimani, Sulaimaniyah, Kurdistan Region-Iraq
| | - C. I. Edvard Smith
- Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Karolinska Hospital Huddinge, SE-141 86 Huddinge-Stockholm, Sweden
- * E-mail: ; (DKM); (CIES)
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188
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Crowell KT, Steiner JL, Coleman CS, Lang CH. Decreased Whole-Body Fat Mass Produced by Chronic Alcohol Consumption is Associated with Activation of S6K1-Mediated Protein Synthesis and Increased Autophagy in Epididymal White Adipose Tissue. Alcohol Clin Exp Res 2016; 40:1832-45. [PMID: 27464336 DOI: 10.1111/acer.13159] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 06/23/2016] [Indexed: 12/25/2022]
Abstract
BACKGROUND Chronic alcohol consumption leads to a loss of white adipose tissue (WAT) but the underlying mechanisms for this lipodystrophy are not fully elucidated. This study tested the hypothesis that the reduction in WAT mass in chronic alcohol-fed mice is associated with a decreased protein synthesis specifically related to impaired function of mammalian target of rapamycin (mTOR). METHODS Adult male mice were provided an alcohol-containing liquid diet for 24 weeks or an isonitrogenous isocaloric control diet. In vivo protein synthesis was determined at this time and thereafter epididymal WAT (eWAT) was excised for analysis of signal transduction pathways central to controling protein synthesis and degradation. RESULTS While chronic alcohol feeding decreased whole-body and eWAT mass, this was associated with a discordant increase in protein synthesis in eWAT. This increase was not associated with a change in mTOR, 4E-BP1, Akt, or PRAS40 phosphorylation. Instead, a selective increase in phosphorylation of S6K1 and its downstream substrates, S6 and eIF4B was detected in alcohol-fed mice. Alcohol also increased eEF2K phosphorylation and decreased eEF2 phosphorylation consistent with increased translation elongation. Alcohol increased Atg12-5, LC3B-I and -II, and ULK1 S555 phosphorylation, suggesting increased autophagy, while markers of apoptosis (cleaved caspase-3 and -9, and PARP) were unchanged. Lipolytic enzymes (ATGL and HSL phosphorylation) were increased and lipogenic regulators (PPARγ and C/EBPα) were decreased in eWAT by alcohol. Although alcohol increased TNF-α, IL-6, and IL-1β mRNA, no change in key components of the NLRP3 inflammasome (NLRP3, ACS, and cleaved caspase-1) was detected suggesting alcohol did not increase pyroptosis. Plasma insulin did not differ between groups. CONCLUSIONS These results demonstrate that the alcohol-induced decrease in whole-body fat mass resulted in part from activation of autophagy in eWAT as protein synthesis was increased and mediated by the specific increase in the activity of S6K1.
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Affiliation(s)
- Kristen T Crowell
- Department of Cellular and Molecular Physiology, Penn State College Medicine, Hershey, Pennsylvania.,Department of Surgery, Penn State College Medicine, Hershey, Pennsylvania
| | - Jennifer L Steiner
- Department of Cellular and Molecular Physiology, Penn State College Medicine, Hershey, Pennsylvania
| | - Catherine S Coleman
- Department of Cellular and Molecular Physiology, Penn State College Medicine, Hershey, Pennsylvania
| | - Charles H Lang
- Department of Cellular and Molecular Physiology, Penn State College Medicine, Hershey, Pennsylvania.,Department of Surgery, Penn State College Medicine, Hershey, Pennsylvania
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189
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Yang A, Fan H, Zhao Y, Zha X, Zhang H, Hu Z, Tu P. Huaier aqueous extract inhibits proliferation and metastasis of tuberous sclerosis complex cell models through downregulation of JAK2/STAT3 and MAPK signaling pathways. Oncol Rep 2016; 36:1491-8. [PMID: 27461043 DOI: 10.3892/or.2016.4969] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 07/18/2016] [Indexed: 11/06/2022] Open
Abstract
Tuberous sclerosis complex (TSC) is a genetic disorder with formation of benign tumors in many different organs. It has attracted increasing attention from researchers to search for therapeutic drugs for TSC patients. Traditional Chinese medicine (TCM) has become an important source for finding antitumor drugs. Trametes robiniophila Μurr. (Huaier) is a kind of officinal fungi in China and has been applied in TCM for approximately 1,600 years. A large number of clinical applications have revealed that Huaier has good antitumor effect. In this study, we have investigated the effects of Huaier aqueous extract on two TSC cell models, including inhibition of proliferation, induction of apoptosis, cell cycle arrest, and anti-metastasis. We demonstrated that Huaier aqueous extract inhibited JAK2/STAT3 and MAPK signaling pathways in a dose-dependent manner. Therefore, based on the low toxicity and the multi-targets of Huaier treatment, Huaier may be a promising therapeutic drug for TSC.
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Affiliation(s)
- Ailin Yang
- Modern Research Center for Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100029, P.R. China
| | - Haitao Fan
- College of Bioengineering, Beijing Polytechnic, Beijing 100029, P.R. China
| | - Yunfang Zhao
- Modern Research Center for Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100029, P.R. China
| | - Xiaojun Zha
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Anhui Medical University, Hefei, Anhui 230032, P.R. China
| | - Hongbing Zhang
- State Key Laboratory of Medical Molecular Biology, Department of Physiology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, Beijing 100005, P.R. China
| | - Zhongdong Hu
- Modern Research Center for Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100029, P.R. China
| | - Pengfei Tu
- Modern Research Center for Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100029, P.R. China
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190
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Yrigollen CM, Pacini L, Nobile V, Lozano R, Hagerman RJ, Bagni C, Tassone F. Clinical and Molecular Assessment in a Female with Fragile X Syndrome and Tuberous Sclerosis. JOURNAL OF GENETIC DISORDERS & GENETIC REPORTS 2016; 5:139. [PMID: 28232951 PMCID: PMC5319728 DOI: 10.4172/2327-5790.1000139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
OBJECTIVE Fragile X syndrome (FXS) and tuberous sclerosis (TSC) are genetic disorders that result in intellectual disability and an increased prevalence of autism spectrum disorders (ASD). While the clinical presentation of each disorder is distinct, the molecular causes are linked to a disruption in the mTORC1 (mammalian Target of Rapamycin Complex 1) and ERK1/2 (Extracellular signal-Regulated Kinase) signaling pathways. METHODS We assessed the clinical and molecular characteristics of an individual seen at the UC Davis MIND Institute with a diagnosis of FXS and TSC. Clinical evaluation of physical, behavioral, and cognitive impairments were performed. Additionally, total and phosphorylated proteins along the mTORC1 and ERK1/2 pathways were measured in primary fibroblast cell lines from the proband. RESULTS In this case the phenotypic effects that result in a human with both FXS and TSC are shown to be severe. Changes in mTORC1 and ERK1/2 signaling proteins and global protein synthesis were not found to be noticeably different between four cohorts (typically developing, FMR1 full mutation, FMR1 full mutation and TSC1 loss of function mutation, and TSC1 loss of function mutation); however cohort sizes prevented stringent comparisons. CONCLUSION It has previously been suggested that disruption of the mTORC1 pathway was reciprocal in TSC and FXS double knock-out mouse models so that the regulation of these pathways were more similar to wild-type mice compared to mice harboring a Fmr1-/y or Tsc2-/+ mutation alone. However, in this first reported case of a human with a diagnosis of both FXS and TSC, substantial clinical impairments, as a result of these two disorders were observed. Differences in the mTORC and ERK1/2 pathways were not clearly established when compared between individuals with either disorder, or both.
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Affiliation(s)
- Carolyn M Yrigollen
- Department of Pathology and Laboratory Medicine, Children’s Hospital of Philadelphia, USA
| | - Laura Pacini
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, Italy
| | - Veronica Nobile
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, Italy
| | - Reymundo Lozano
- Department of Pediatrics, University of California, Davis, USA
| | - Randi J. Hagerman
- Department of Pediatrics, University of California, Davis, USA
- MIND Institute, University of California, Davis, USA
| | - Claudia Bagni
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, Italy
- VIB Center for the Biology of Disease and Center for Human Genetics, Leuven, Belgium
- Department of Fundamental Neuroscience, University of Lausanne, Lausanne, Switzerland
| | - Flora Tassone
- MIND Institute, University of California, Davis, USA
- Department of Biochemistry and Molecular Medicine, University of California, Davis, USA
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191
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Alteration of protein prenylation promotes spermatogonial differentiation and exhausts spermatogonial stem cells in newborn mice. Sci Rep 2016; 6:28917. [PMID: 27374985 PMCID: PMC4931501 DOI: 10.1038/srep28917] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 06/10/2016] [Indexed: 12/12/2022] Open
Abstract
Spermatogenesis in adulthood depends on the successful neonatal establishment of the spermatogonial stem cell (SSC) pool and gradual differentiation during puberty. The stage-dependent changes in protein prenylation in the seminiferous epithelium might be important during the first round of spermatogenesis before sexual maturation, but the mechanisms are unclear. We have previous found that altered prenylation in Sertoli cells induced spermatogonial apoptosis in the neonatal testis, resulting in adult infertility. Now we further explored the role of protein prenylation in germ cells, using a conditional deletion of geranylgeranyl diphosphate synthase (Ggpps) in embryonic stage and postmeiotic stage respectively. We observed infertility of Ggpps(-/-) Ddx4-Cre mice that displayed a Sertoli-cell-only syndrome phenotype, which resulted from abnormal spermatogonial differentiation and SSC depletion during the prepubertal stage. Analysis of morphological characteristics and cell-specific markers revealed that spermatogonial differentiation was enhanced from as early as the 7(th) postnatal day in the first round of spermatogenesis. Studies of the molecular mechanisms indicated that Ggpps deletion enhanced Rheb farnesylation, which subsequently activated mTORC1 and facilitated spermatogonial differentiation. In conclusion, the prenylation balance in germ cells is crucial for spermatogonial differentiation fate decision during the prepubertal stage, and the disruption of this process results in primary infertility.
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192
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Overexpression of PRAS40(T246A) in the Proliferative Compartment Suppresses mTORC1 Signaling, Keratinocyte Migration, and Skin Tumor Development. J Invest Dermatol 2016; 136:2070-2079. [PMID: 27349859 DOI: 10.1016/j.jid.2016.06.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 05/17/2016] [Accepted: 06/06/2016] [Indexed: 02/07/2023]
Abstract
The proline-rich Akt (v-akt murine thymoma viral oncogene homolog 1) substrate of 40 kDa (PRAS40), an inhibitory component of the mTORC1 complex, was identified as an Akt substrate through phosphorylation at Thr246. Phosphorylation at this site releases PRAS40 from the mammalian/mechanistic target of rapamycin complex 1 (mTORC1) complex allowing increased activity. Targeted expression of a mutant form of PRAS40 (PRAS40(T246A)) in basal keratinocytes of mouse epidermis (BK5.PRAS40(T246A) mice) has allowed further examination of mTORC1-specific signaling in epithelial carcinogenesis. BK5.PRAS40(T246A) mice were resistant to 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced epidermal hyperproliferation and skin tumor development. In transgenic mice, PRAS40(T246A) remained bound to raptor in keratinocytes even after treatment with TPA, consistent with reduced mTORC1 signaling and altered levels of cell cycle proteins. BK5.PRAS40(T246A) mice also displayed attenuated skin inflammation in response to TPA. Inhibition of mTORC1 in keratinocytes significantly inhibited their migration in vitro and, in addition, inhibited 12-O-tetradecanoylphorbol-13-acetate-induced proliferation and migration of bulge-region stem cells in vivo. Furthermore, targeted inhibition of mTORC1 in BK5.PRAS40(T246A) mice resulted in delayed wound healing. Decreased keratinocyte migration and impaired wound healing correlated with altered expression of epithelial-mesenchymal transition (EMT) markers and reduced smad signaling. Collectively, the current data using this unique mouse model provide further evidence that mTORC1 signaling in keratinocytes regulates key events in keratinocyte function and epithelial cancer development.
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193
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Rejuvenating immunity: "anti-aging drug today" eight years later. Oncotarget 2016; 6:19405-12. [PMID: 25844603 PMCID: PMC4637294 DOI: 10.18632/oncotarget.3740] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Accepted: 03/28/2015] [Indexed: 01/02/2023] Open
Abstract
The 2014 year ended with celebration: Everolimus, a rapamycin analog, was shown to improve immunity in old humans, heralding ‘a turning point’ in research and new era in human quest for immortality. Yet, this turning point was predicted a decade ago. But what will cause human death, when aging will be abolished?
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194
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The 2015 World Health Organization Classification of Lung Tumors: Impact of Genetic, Clinical and Radiologic Advances Since the 2004 Classification. J Thorac Oncol 2016; 10:1243-1260. [PMID: 26291008 DOI: 10.1097/jto.0000000000000630] [Citation(s) in RCA: 2865] [Impact Index Per Article: 358.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The 2015 World Health Organization (WHO) Classification of Tumors of the Lung, Pleura, Thymus and Heart has just been published with numerous important changes from the 2004 WHO classification. The most significant changes in this edition involve (1) use of immunohistochemistry throughout the classification, (2) a new emphasis on genetic studies, in particular, integration of molecular testing to help personalize treatment strategies for advanced lung cancer patients, (3) a new classification for small biopsies and cytology similar to that proposed in the 2011 Association for the Study of Lung Cancer/American Thoracic Society/European Respiratory Society classification, (4) a completely different approach to lung adenocarcinoma as proposed by the 2011 Association for the Study of Lung Cancer/American Thoracic Society/European Respiratory Society classification, (5) restricting the diagnosis of large cell carcinoma only to resected tumors that lack any clear morphologic or immunohistochemical differentiation with reclassification of the remaining former large cell carcinoma subtypes into different categories, (6) reclassifying squamous cell carcinomas into keratinizing, nonkeratinizing, and basaloid subtypes with the nonkeratinizing tumors requiring immunohistochemistry proof of squamous differentiation, (7) grouping of neuroendocrine tumors together in one category, (8) adding NUT carcinoma, (9) changing the term sclerosing hemangioma to sclerosing pneumocytoma, (10) changing the name hamartoma to "pulmonary hamartoma," (11) creating a group of PEComatous tumors that include (a) lymphangioleiomyomatosis, (b) PEComa, benign (with clear cell tumor as a variant) and
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195
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Hjelmeland A, Zhang J. Metabolic, autophagic, and mitophagic activities in cancer initiation and progression. Biomed J 2016; 39:98-106. [PMID: 27372165 PMCID: PMC5514543 DOI: 10.1016/j.bj.2015.10.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 10/19/2015] [Indexed: 12/11/2022] Open
Abstract
Cancer is a complex disease marked by uncontrolled cell growth and invasion. These processes are driven by the accumulation of genetic and epigenetic alterations that promote cancer initiation and progression. Contributing to genome changes are the regulation of oxidative stress and reactive species-induced damage to molecules and organelles. Redox regulation, metabolic plasticity, autophagy, and mitophagy play important and interactive roles in cancer hallmarks including sustained proliferation, activated invasion, and replicative immortality. However, the impact of these processes can differ depending on the signaling pathways altered in cancer, tumor type, tumor stage, and/or the differentiation state. Here, we highlight some of the representative studies on the impact of oxidative and nitrosative activities, mitochondrial bioenergetics, metabolism, and autophagy and mitophagy in the context of tumorigenesis. We discuss the implications of these processes for cellular activities in cancer for anti-cancer-based therapeutics.
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Affiliation(s)
- Anita Hjelmeland
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, USA; Center for Free Radical Biology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Jianhua Zhang
- Center for Free Radical Biology, University of Alabama at Birmingham, Birmingham, AL, USA; Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA; Department of Veterans Affairs, Birmingham VA Medical Center, Birmingham, AL, USA.
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196
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Wengrod JC, Gardner LB. Cellular adaptation to nutrient deprivation: crosstalk between the mTORC1 and eIF2α signaling pathways and implications for autophagy. Cell Cycle 2016; 14:2571-7. [PMID: 26039820 DOI: 10.1080/15384101.2015.1056947] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The hostile tumor microenvironment results in the generation of intracellular stresses including hypoxia and nutrient deprivation. In order to adapt to such conditions, the cell utilizes several stress-response mechanisms, including the attenuation of protein synthesis, the inhibition of cellular proliferation, and induction of autophagy. Autophagy leads to the degradation of cellular contents, including damaged organelles and mutant proteins, which the cell can then use as an alternate energy source. Two integral changes to the signaling milieu to promote such a response include inhibition of the mammalian target of rapamycin complex 1 (mTORC1) and phosphorylation of eIF2α. This review will describe how conditions found in the tumor microenvironment regulate mTORC1 as well as eIF2α, the downstream impact of these modifications, and the implications in tumorigenesis. We will then discuss the remarkable similarities and overlapping function of these 2 signaling pathways, focusing on the response to amino acid deprivation, and present a new model involving crosstalk between them based on our recent work.
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Affiliation(s)
- Jordan C Wengrod
- a Department of Biochemistry and Molecular Pharmacology ; New York University School of Medicine , New York , NY USA
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197
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Suizu F, Hirata N, Kimura K, Edamura T, Tanaka T, Ishigaki S, Donia T, Noguchi H, Iwanaga T, Noguchi M. Phosphorylation-dependent Akt-Inversin interaction at the basal body of primary cilia. EMBO J 2016; 35:1346-63. [PMID: 27220846 PMCID: PMC4883026 DOI: 10.15252/embj.201593003] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 04/06/2016] [Indexed: 01/01/2023] Open
Abstract
A primary cilium is a microtubule‐based sensory organelle that plays an important role in human development and disease. However, regulation of Akt in cilia and its role in ciliary development has not been demonstrated. Using yeast two‐hybrid screening, we demonstrate that Inversin (INVS) interacts with Akt. Mutation in the INVS gene causes nephronophthisis type II (NPHP2), an autosomal recessive chronic tubulointerstitial nephropathy. Co‐immunoprecipitation assays show that Akt interacts with INVS via the C‐terminus. In vitro kinase assays demonstrate that Akt phosphorylates INVS at amino acids 864–866 that are required not only for Akt interaction, but also for INVS dimerization. Co‐localization of INVS and phosphorylated form of Akt at the basal body is augmented by PDGF‐AA. Akt‐null MEF cells as well as siRNA‐mediated inhibition of Akt attenuated ciliary growth, which was reversed by Akt reintroduction. Mutant phosphodead‐ or NPHP2‐related truncated INVS, which lack Akt phosphorylation sites, suppress cell growth and exhibit distorted lumen formation and misalignment of spindle axis during cell division. Further studies will be required for elucidating functional interactions of Akt–INVS at the primary cilia for identifying the molecular mechanisms underlying NPHP2.
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Affiliation(s)
- Futoshi Suizu
- Division of Cancer Biology, Institute for Genetic Medicine Hokkaido University, Sapporo, Japan
| | - Noriyuki Hirata
- Division of Cancer Biology, Institute for Genetic Medicine Hokkaido University, Sapporo, Japan
| | - Kohki Kimura
- Division of Cancer Biology, Institute for Genetic Medicine Hokkaido University, Sapporo, Japan
| | - Tatsuma Edamura
- Division of Cancer Biology, Institute for Genetic Medicine Hokkaido University, Sapporo, Japan
| | - Tsutomu Tanaka
- Division of Cancer Biology, Institute for Genetic Medicine Hokkaido University, Sapporo, Japan
| | - Satoko Ishigaki
- Division of Cancer Biology, Institute for Genetic Medicine Hokkaido University, Sapporo, Japan
| | - Thoria Donia
- Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt
| | - Hiroko Noguchi
- Department of Pathology, Teine Keijinkai Hospital, Sapporo, Japan
| | - Toshihiko Iwanaga
- Laboratory of Histology and Cytology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Masayuki Noguchi
- Division of Cancer Biology, Institute for Genetic Medicine Hokkaido University, Sapporo, Japan
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198
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Xiao F, Deng J, Guo Y, Niu Y, Yuan F, Yu J, Chen S, Guo F. BTG1 ameliorates liver steatosis by decreasing stearoyl-CoA desaturase 1 (SCD1) abundance and altering hepatic lipid metabolism. Sci Signal 2016; 9:ra50. [PMID: 27188441 DOI: 10.1126/scisignal.aad8581] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Liver steatosis, a condition in which lipid accumulates in liver cells, is a leading cause of many liver diseases. The livers of patients with hepatocellular carcinoma, a cancer characterized by liver steatosis, have decreased abundance of the transcription cofactor BTG1 (B cell translocation gene 1). We showed that the livers of db/db mice, which are a genetic model of obesity, had decreased BTG1 mRNA and protein abundance. BTG1 overexpression ameliorated liver steatosis in db/db mice, whereas knockdown of BTG1 induced liver steatosis in wild-type mice. Consistent with these changes, we found that BTG1 decreased triglyceride accumulation in cultured hepatocytes. BTG1 overexpression inhibited the expression of the gene encoding stearoyl-CoA desaturase 1 (SCD1), an enzyme involved in the synthesis of fatty acids, by suppressing the activity of activating transcription factor 4 (ATF4). Knockdown of SCD1 prevented liver steatosis in wild-type mice induced by knockdown of BTG1. Conversely, the ability of BTG1 overexpression to ameliorate liver steatosis in db/db mice was negated by ATF4 overexpression. Moreover, BTG1 transgenic mice were resistant to liver steatosis induced by a high-carbohydrate diet. BTG1 abundance was decreased by this diet through a pathway that involved mammalian target of rapamycin (mTOR), ribosomal protein S6 kinase 1 (S6K1), and cAMP response element-binding protein (CREB). Together, our study identifies a role of BTG1 in regulating hepatic lipid metabolism and specifically in preventing ATF4 and SCD1 from inducing liver steatosis.
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Affiliation(s)
- Fei Xiao
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Jiali Deng
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Yajie Guo
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Yuguo Niu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Feixiang Yuan
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Junjie Yu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Shanghai Chen
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Feifan Guo
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China.
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199
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Khurana S. The effects of proliferation and DNA damage on hematopoietic stem cell function determine aging. Dev Dyn 2016; 245:739-50. [PMID: 26813236 DOI: 10.1002/dvdy.24388] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Revised: 12/17/2015] [Accepted: 01/04/2016] [Indexed: 12/16/2022] Open
Abstract
In most of the mammalian tissues, homeostasis as well as injury repair depend upon a small number of resident adult stem cells. The decline in tissue/organ function in aged organisms has been directly linked with poorly functioning stem cells. Altered function of hematopoietic stem cells (HSCs) is at the center of an aging hematopoietic system, a tissue with high cellular turnover. Poorly engrafting, myeloid-biased HSCs with higher levels of DNA damage accumulation are the hallmark features of an aged hematopoietic system. These cells show a higher proliferation rate than their younger counterparts. It was proposed that quiescence of these cells over long period of time leads to accumulation of DNA damage, eventually resulting in poor function/pathological conditions in hematopoietic system. However, various mouse models with premature aging phenotype also show highly proliferative HSCs. This review examines the evidence that links proliferation of HSCs with aging, which leads to functional changes in the hematopoietic system. Developmental Dynamics 245:739-750, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Satish Khurana
- School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram, India, 695016
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200
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Qin J, Wang Z, Hoogeveen-Westerveld M, Shen G, Gong W, Nellist M, Xu W. Structural Basis of the Interaction between Tuberous Sclerosis Complex 1 (TSC1) and Tre2-Bub2-Cdc16 Domain Family Member 7 (TBC1D7). J Biol Chem 2016; 291:8591-601. [PMID: 26893383 PMCID: PMC4861430 DOI: 10.1074/jbc.m115.701870] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Indexed: 01/07/2023] Open
Abstract
Mutations in TSC1 or TSC2 cause tuberous sclerosis complex (TSC), an autosomal dominant disorder characterized by the occurrence of benign tumors in various vital organs and tissues. TSC1 and TSC2, the TSC1 and TSC2 gene products, form the TSC protein complex that senses specific cellular growth conditions to control mTORC1 signaling. TBC1D7 is the third subunit of the TSC complex, and helps to stabilize the TSC1-TSC2 complex through its direct interaction with TSC1. Homozygous inactivation of TBC1D7 causes intellectual disability and megaencephaly. Here we report the crystal structure of a TSC1-TBC1D7 complex and biochemical characterization of the TSC1-TBC1D7 interaction. TBC1D7 interacts with the C-terminal region of the predicted coiled-coil domain of TSC1. The TSC1-TBC1D7 interface is largely hydrophobic, involving the α4 helix of TBC1D7. Each TBC1D7 molecule interacts simultaneously with two parallel TSC1 helices from two TSC1 molecules, suggesting that TBC1D7 may stabilize the TSC complex by tethering the C-terminal ends of two TSC1 coiled-coils.
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Affiliation(s)
- Jiayue Qin
- From the Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China, ,the Department of Biological Structure, University of Washington, Seattle, Washington 98195, ,the University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhizhi Wang
- the Department of Biological Structure, University of Washington, Seattle, Washington 98195
| | | | - Guobo Shen
- the Department of Biological Structure, University of Washington, Seattle, Washington 98195
| | - Weimin Gong
- From the Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China, ,the Hefei National Laboratory for Physical Science at Microscale, University of Science and Technology of China, Hefei 230026, China, To whom correspondence may be addressed: Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China. Tel.: 86-10-64888465; E-mail:
| | - Mark Nellist
- the Department of Clinical Genetics, Erasmus Medical Center, 3015CN Rotterdam, The Netherlands, and , To whom correspondence may be addressed. Tel.: 31-10-7043153; E-mail:
| | - Wenqing Xu
- From the Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China, ,the Department of Biological Structure, University of Washington, Seattle, Washington 98195, , To whom correspondence may be addressed: Dept. of Biological Structure, University of Washington, Seattle, WA 98195. Tel.: 206-221-5609; Fax: 206-543-1524; E-mail:
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