1
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Sun X, Zhou D, Sun Y, Zhao Y, Deng Y, Pang X, Liu Q, Zhou Z. Oxidative stress reprograms the transcriptional coactivator Yki to suppress cell proliferation. Cell Rep 2024; 43:114584. [PMID: 39106181 DOI: 10.1016/j.celrep.2024.114584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 07/17/2024] [Accepted: 07/19/2024] [Indexed: 08/09/2024] Open
Abstract
The transcriptional coactivator Yorkie (Yki) regulates organ size by promoting cell proliferation. It is unclear how cells control Yki activity when exposed to harmful stimuli such as oxidative stress. In this study, we show that oxidative stress inhibits the binding of Yki to Scalloped (Sd) but promotes the interaction of Yki with another transcription factor, forkhead box O (Foxo), ultimately leading to a halt in cell proliferation. Mechanistically, Foxo normally exhibits a low binding affinity for Yki, allowing Yki to form a complex with Sd and activate proliferative genes. Under oxidative stress, Usp7 deubiquitinates Foxo to promote its interaction with Yki, thereby activating the expression of proliferation suppressors. Finally, we show that Yki is essential for Drosophila survival under oxidative stress. In summary, these findings suggest that oxidative stress reprograms Yki from a proliferation-promoting factor to a proliferation suppressor, forming a self-protective mechanism.
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Affiliation(s)
- Xiaohan Sun
- Key Laboratory of Biodiversity Conservation and Bioresource Utilization of Jiangxi Province, College of Life Sciences, Jiangxi Normal University, Nanchang 330022, China; School of Life Sciences and Medicine, Shandong University of Technology, Zibo 255000, China
| | - Dafa Zhou
- College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Yuanfei Sun
- College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Yunhe Zhao
- College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Yanran Deng
- Key Laboratory of Biodiversity Conservation and Bioresource Utilization of Jiangxi Province, College of Life Sciences, Jiangxi Normal University, Nanchang 330022, China
| | - Xiaolin Pang
- College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Qingxin Liu
- College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Zizhang Zhou
- Key Laboratory of Biodiversity Conservation and Bioresource Utilization of Jiangxi Province, College of Life Sciences, Jiangxi Normal University, Nanchang 330022, China; College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China.
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2
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Dabral S, Noh M, Werner F, Krebes L, Völker K, Maier C, Aleksic I, Novoyatleva T, Hadzic S, Schermuly RT, Perez VADJ, Kuhn M. C-type natriuretic peptide/cGMP/FoxO3 signaling attenuates hyperproliferation of pericytes from patients with pulmonary arterial hypertension. Commun Biol 2024; 7:693. [PMID: 38844781 PMCID: PMC11156916 DOI: 10.1038/s42003-024-06375-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 05/23/2024] [Indexed: 06/09/2024] Open
Abstract
Pericyte dysfunction, with excessive migration, hyperproliferation, and differentiation into smooth muscle-like cells contributes to vascular remodeling in Pulmonary Arterial Hypertension (PAH). Augmented expression and action of growth factors trigger these pathological changes. Endogenous factors opposing such alterations are barely known. Here, we examine whether and how the endothelial hormone C-type natriuretic peptide (CNP), signaling through the cyclic guanosine monophosphate (cGMP) -producing guanylyl cyclase B (GC-B) receptor, attenuates the pericyte dysfunction observed in PAH. The results demonstrate that CNP/GC-B/cGMP signaling is preserved in lung pericytes from patients with PAH and prevents their growth factor-induced proliferation, migration, and transdifferentiation. The anti-proliferative effect of CNP is mediated by cGMP-dependent protein kinase I and inhibition of the Phosphoinositide 3-kinase (PI3K)/AKT pathway, ultimately leading to the nuclear stabilization and activation of the Forkhead Box O 3 (FoxO3) transcription factor. Augmentation of the CNP/GC-B/cGMP/FoxO3 signaling pathway might be a target for novel therapeutics in the field of PAH.
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Affiliation(s)
- Swati Dabral
- Institute of Physiology, University of Würzburg, Würzburg, Germany.
| | - Minhee Noh
- Institute of Physiology, University of Würzburg, Würzburg, Germany
| | - Franziska Werner
- Institute of Physiology, University of Würzburg, Würzburg, Germany
| | - Lisa Krebes
- Institute of Physiology, University of Würzburg, Würzburg, Germany
| | - Katharina Völker
- Institute of Physiology, University of Würzburg, Würzburg, Germany
| | - Christopher Maier
- Department of Thoracic and Cardiovascular Surgery, University hospital Würzburg, Würzburg, Germany
| | - Ivan Aleksic
- Department of Thoracic and Cardiovascular Surgery, University hospital Würzburg, Würzburg, Germany
| | - Tatyana Novoyatleva
- Justus-Liebig-University Giessen (JLU), Giessen, Germany
- Universities of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany
- Excellence Cluster Cardio-Pulmonary Institute (CPI), Giessen, Germany
- Member of the German Center for Lung Research (DZL), Giessen, Germany
| | - Stefan Hadzic
- Justus-Liebig-University Giessen (JLU), Giessen, Germany
- Universities of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany
- Excellence Cluster Cardio-Pulmonary Institute (CPI), Giessen, Germany
- Member of the German Center for Lung Research (DZL), Giessen, Germany
| | - Ralph Theo Schermuly
- Justus-Liebig-University Giessen (JLU), Giessen, Germany
- Universities of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany
- Excellence Cluster Cardio-Pulmonary Institute (CPI), Giessen, Germany
- Member of the German Center for Lung Research (DZL), Giessen, Germany
| | - Vinicio A de Jesus Perez
- Divisions of Pulmonary and Critical Care Medicine and Stanford Cardiovascular Institute, Stanford University, California, USA
| | - Michaela Kuhn
- Institute of Physiology, University of Würzburg, Würzburg, Germany
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3
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Guo X, Peng K, He Y, Xue L. Mechanistic regulation of FOXO transcription factors in the nucleus. Biochim Biophys Acta Rev Cancer 2024; 1879:189083. [PMID: 38309444 DOI: 10.1016/j.bbcan.2024.189083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 01/28/2024] [Accepted: 01/31/2024] [Indexed: 02/05/2024]
Abstract
FOXO proteins represent evolutionarily conserved transcription factors (TFs) that play critical roles in responding to various physiological signals or pathological stimuli, either through transcription-dependent or -independent mechanisms. Dysfunction of these proteins have been implicated in numerous diseases, including cancer. Although the regulation of FOXO TFs shuttling between the cytoplasm and the nucleus has been extensively studied and reviewed, there's still a lack of a comprehensive review focusing on the intricate interactions between FOXO, DNA, and cofactors in the regulation of gene expression. In this review, we aim to summarize recent advances and provide a detailed understanding of the mechanism underlying FOXO proteins binding to target DNA. Additionally, we will discuss the challenges associated with pharmacological approaches in modulating FOXO function, and explore the dynamic association between TF, DNA, and RNA on chromatin. This review will contribute to a better understanding of mechanistic regulations of eukaryotic TFs within the nucleus.
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Affiliation(s)
- Xiaowei Guo
- The Key Laboratory of Model Animals and Stem Cell Biology in Hunan Province, School of Medicine, Hunan Normal University, Changsha, China; The Engineering Research Center of Reproduction and Translational Medicine of Hunan Province, Changsha, China.
| | - Kai Peng
- Institute of Intervention Vessel, Shanghai 10th People's Hospital, Shanghai Key Laboratory of Signaling and Diseases Research, School of Life Science and Technology, Tongji University, Shanghai, China
| | - Yanwen He
- Changsha Stomatological Hospital, Hunan University of Chinese Medicine, Changsha, Hunan, China
| | - Lei Xue
- Institute of Intervention Vessel, Shanghai 10th People's Hospital, Shanghai Key Laboratory of Signaling and Diseases Research, School of Life Science and Technology, Tongji University, Shanghai, China.
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4
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Ramatchandirin B, Pearah A, He L. Regulation of Liver Glucose and Lipid Metabolism by Transcriptional Factors and Coactivators. Life (Basel) 2023; 13:life13020515. [PMID: 36836874 PMCID: PMC9962321 DOI: 10.3390/life13020515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 02/08/2023] [Accepted: 02/10/2023] [Indexed: 02/16/2023] Open
Abstract
The prevalence of nonalcoholic fatty liver disease (NAFLD) worldwide is on the rise and NAFLD is becoming the most common cause of chronic liver disease. In the USA, NAFLD affects over 30% of the population, with similar occurrence rates reported from Europe and Asia. This is due to the global increase in obesity and type 2 diabetes mellitus (T2DM) because patients with obesity and T2DM commonly have NAFLD, and patients with NAFLD are often obese and have T2DM with insulin resistance and dyslipidemia as well as hypertriglyceridemia. Excessive accumulation of triglycerides is a hallmark of NAFLD and NAFLD is now recognized as the liver disease component of metabolic syndrome. Liver glucose and lipid metabolisms are intertwined and carbon flux can be used to generate glucose or lipids; therefore, in this review we discuss the important transcription factors and coactivators that regulate glucose and lipid metabolism.
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Affiliation(s)
| | - Alexia Pearah
- Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Ling He
- Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, 600 N. Wolfe St, Baltimore, MD 21287, USA
- Correspondence: ; Tel.: +1-410-502-5765; Fax: +1-410-502-5779
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5
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Frendo-Cumbo S, Li T, Ammendolia DA, Coyaud E, Laurent EM, Liu Y, Bilan PJ, Polevoy G, Raught B, Brill JA, Klip A, Brumell JH. DCAF7 regulates cell proliferation through IRS1-FOXO1 signaling. iScience 2022; 25:105188. [PMID: 36248734 PMCID: PMC9556925 DOI: 10.1016/j.isci.2022.105188] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 07/13/2022] [Accepted: 09/20/2022] [Indexed: 12/13/2022] Open
Abstract
Cell proliferation is dependent on growth factors insulin and IGF1. We sought to identify interactors of IRS1, the most proximal mediator of insulin/IGF1 signaling, that regulate cell proliferation. Using proximity-dependent biotin identification (BioID), we detected 40 proteins displaying proximal interactions with IRS1, including DCAF7 and its interacting partners DYRK1A and DYRK1B. In HepG2 cells, DCAF7 knockdown attenuated cell proliferation by inducing cell cycle arrest at G2. DCAF7 expression was required for insulin-stimulated AKT phosphorylation, and its absence promoted nuclear localization of the transcription factor FOXO1. DCAF7 knockdown induced expression of FOXO1-target genes implicated in G2 cell cycle inhibition, correlating with G2 cell cycle arrest. In Drosophila melanogaster, wing-specific knockdown of DCAF7/wap caused smaller wing size and lower wing cell number; the latter recovered upon double knockdown of wap and dfoxo. We propose that DCAF7 regulates cell proliferation and cell cycle via IRS1-FOXO1 signaling, of relevance to whole organism growth.
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Affiliation(s)
- Scott Frendo-Cumbo
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada,Department of Physiology, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Taoyingnan Li
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada,Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Dustin A. Ammendolia
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada,Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Etienne Coyaud
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2C1, Canada
| | - Estelle M.N. Laurent
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2C1, Canada
| | - Yuan Liu
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Philip J. Bilan
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Gordon Polevoy
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Brian Raught
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2C1, Canada,Department of Medical Biophysics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Julie A. Brill
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada,Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada,Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Amira Klip
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada,Department of Physiology, University of Toronto, Toronto, ON M5G 1L7, Canada,Department of Biochemistry, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - John H. Brumell
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada,Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada,Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada,SickKids IBD Centre, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada,Corresponding author
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6
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Heterozygous Loss of KRIT1 in Mice Affects Metabolic Functions of the Liver, Promoting Hepatic Oxidative and Glycative Stress. Int J Mol Sci 2022; 23:ijms231911151. [PMID: 36232456 PMCID: PMC9570113 DOI: 10.3390/ijms231911151] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 09/16/2022] [Accepted: 09/19/2022] [Indexed: 12/04/2022] Open
Abstract
KRIT1 loss-of-function mutations underlie the pathogenesis of Cerebral Cavernous Malformation (CCM), a major vascular disease affecting the central nervous system (CNS). However, KRIT1 is also expressed outside the CNS and modulates key regulators of metabolic and oxy-inflammatory pathways, including the master transcription factor FoxO1, suggesting a widespread functional significance. Herein, we show that the KRIT1/FoxO1 axis is implicated in liver metabolic functions and antioxidative/antiglycative defenses. Indeed, by performing comparative studies in KRIT1 heterozygous (KRIT1+/−) and wild-type mice, we found that KRIT1 haploinsufficiency resulted in FoxO1 expression/activity downregulation in the liver, and affected hepatic FoxO1-dependent signaling pathways, which are markers of major metabolic processes, including gluconeogenesis, glycolysis, mitochondrial respiration, and glycogen synthesis. Moreover, it caused sustained activation of the master antioxidant transcription factor Nrf2, hepatic accumulation of advanced glycation end-products (AGEs), and abnormal expression/activity of AGE receptors and detoxifying systems. Furthermore, it was associated with an impairment of food intake, systemic glucose disposal, and plasma levels of insulin. Specific molecular alterations detected in the liver of KRIT1+/− mice were also confirmed in KRIT1 knockout cells. Overall, our findings demonstrated, for the first time, that KRIT1 haploinsufficiency affects glucose homeostasis and liver metabolic and antioxidative/antiglycative functions, thus inspiring future basic and translational studies.
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7
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Zhu X, Zou W, Meng X, Ji J, Wang X, Shu H, Chen Y, Pan D, Wang K, Zhou F. Elaiophylin Inhibits Tumorigenesis of Human Uveal Melanoma by Suppressing Mitophagy and Inducing Oxidative Stress via Modulating SIRT1/FoxO3a Signaling. Front Oncol 2022; 12:788496. [PMID: 35387119 PMCID: PMC8978265 DOI: 10.3389/fonc.2022.788496] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Accepted: 02/28/2022] [Indexed: 12/18/2022] Open
Abstract
Uveal melanoma (UM) is the most common primary intraocular tumor in adults, which is associated with poor prognosis. Up to 50% of UM patients develop metastasis. Therapeutics that have proven effective in cutaneous melanoma have little success in treating UM, possibly due to its low mutational burden. Therefore, new drug therapies are highly desired for UM. Our in vitro studies showed that Elaiophylin, a late-stage autophagy inhibitor, exhibited an outstanding anticancer activity in human UM cell lines and human UM primary cells through suppressing mitophagy, inducing oxidative stress and leading to autophagic cell death. Our mechanistic study revealed that Elaiophylin exerted its effect by down-regulating SIRT1 and thus influencing deacetylation and mitochondrial localization of FoxO3a. In our confirmatory experiments, SRT1720, a SIRT1 specific activator, could attenuate Elaiophylin-induced inhibition of mitophagy and elevation of oxidative stress, and such effects was partly reversed by FoxO3a knockdown. Our further in vivo studies showed that Elaiophylin dramatically inhibited tumor growth in the human UM xenograft mouse model, which was accompanied with a decreased SIRT1 expression. Thus, the current study is the first to demonstrate that Elaiophylin has a potent anti-cancer effect against UM, which activity is possibly mediated through regulating SIRT1-FoxO3a signaling axis. And Elaiophylin may be a new and promising drug candidate to treat human UM.
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Affiliation(s)
- Xue Zhu
- National Health Commission (NHC) Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, China.,Department of Radiopharmaceuticals, School of Pharmacy, Nanjing Medical University, Nanjing, China
| | - Wenjun Zou
- Department of Ophthalmology, The Affiliated Wuxi No.2 People's Hospital of Nanjing Medical University, Wuxi, China
| | - Xinmin Meng
- Department of Respiratory and Critical Care Medicine, The Affiliated Wuxi No.2 People's Hospital of Nanjing Medical University, Wuxi, China.,Department of Laboratory Medicine, Cancer Medical College of Guangxi Medical University, Affiliated Tumor Hospital of Guangxi Medical University, Nanning, China
| | - Jiali Ji
- Department of Respiratory and Critical Care Medicine, The Affiliated Wuxi No.2 People's Hospital of Nanjing Medical University, Wuxi, China
| | - Xun Wang
- Department of Respiratory and Critical Care Medicine, The Affiliated Wuxi No.2 People's Hospital of Nanjing Medical University, Wuxi, China
| | - Hong Shu
- Department of Laboratory Medicine, Cancer Medical College of Guangxi Medical University, Affiliated Tumor Hospital of Guangxi Medical University, Nanning, China
| | - Yuan Chen
- National Health Commission (NHC) Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, China.,Department of Radiopharmaceuticals, School of Pharmacy, Nanjing Medical University, Nanjing, China
| | - Donghui Pan
- National Health Commission (NHC) Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, China.,Department of Radiopharmaceuticals, School of Pharmacy, Nanjing Medical University, Nanjing, China
| | - Ke Wang
- National Health Commission (NHC) Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, China.,Department of Radiopharmaceuticals, School of Pharmacy, Nanjing Medical University, Nanjing, China
| | - Fanfan Zhou
- Sydney Pharmacy School, The University of Sydney, Sydney, NSW, Australia
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8
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Sun WL, He LY, Liang L, Liu SY, Luo J, Lv ML, Cai ZW. Ambra1 regulates apoptosis and chemosensitivity in breast cancer cells through the Akt-FoxO1-Bim pathway. Apoptosis 2022; 27:329-341. [PMID: 35257265 DOI: 10.1007/s10495-022-01718-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/21/2022] [Indexed: 11/24/2022]
Abstract
The sensitivity of cells to chemotherapeutic agents has a major effect on disease outcome in breast cancer patients. Unfortunately, there are numerous factors involved in the regulation of chemosensitivity, and the mechanisms need to be further investigated. Autophagy/Beclin 1 regulator 1 (Ambra1) is a key protein in the crosstalk between autophagy and apoptosis. It controls the switch between these two processes, which determines whether cells survive or die. Induction of apoptosis is the primary mechanism by which most chemotherapeutic drugs eliminate cancer cells. Recently, Ambra1 has been shown to modulate paclitaxel-induced apoptosis in breast cancer cells via the Bim/mitochondrial pathway, thereby modifying the sensitivity of cells to paclitaxel. However, how Ambra1 regulates Bim expression remains unclear. Here, we further confirmed that Bim plays an indispensable role in Ambra1's regulation of apoptosis and chemosensitivity in breast cancer cells. Furthermore, Ambra1 was found to regulate Bim expression at the transcriptional level through the Akt-FoxO1 pathway. Therefore, we propose a novel pathway, Ambra1-Akt-FoxO1-Bim, which regulates apoptosis and chemosensitivity in breast cancer cells. Thus, Ambra1 may represent a potential target for breast cancer treatment.
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Affiliation(s)
- Wei-Liang Sun
- Department of Medical Oncology, the Second Affiliated Hospital of Guangxi Medical University, No. 166 Daxuedonglu Road, Nanning, 530007, Guangxi, People's Republic of China.
| | - Ling-Yan He
- Department of Medical Oncology, the Second Affiliated Hospital of Guangxi Medical University, No. 166 Daxuedonglu Road, Nanning, 530007, Guangxi, People's Republic of China
| | - Li Liang
- Department of Medical Oncology, the Second Affiliated Hospital of Guangxi Medical University, No. 166 Daxuedonglu Road, Nanning, 530007, Guangxi, People's Republic of China
| | - Si-Yu Liu
- Department of Medical Oncology, the Second Affiliated Hospital of Guangxi Medical University, No. 166 Daxuedonglu Road, Nanning, 530007, Guangxi, People's Republic of China
| | - Jie Luo
- Department of Medical Oncology, the Second Affiliated Hospital of Guangxi Medical University, No. 166 Daxuedonglu Road, Nanning, 530007, Guangxi, People's Republic of China
| | - Mei-Ling Lv
- Department of Medical Oncology, the Second Affiliated Hospital of Guangxi Medical University, No. 166 Daxuedonglu Road, Nanning, 530007, Guangxi, People's Republic of China
| | - Zheng-Wen Cai
- Department of Medical Oncology, the Second Affiliated Hospital of Guangxi Medical University, No. 166 Daxuedonglu Road, Nanning, 530007, Guangxi, People's Republic of China
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9
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Frankum R, Jameson TSO, Knight BA, Stephens FB, Wall BT, Donlon TA, Torigoe T, Willcox BJ, Willcox DC, Allsopp RC, Harries LW. Extreme longevity variants at the FOXO3 locus may moderate FOXO3 isoform levels. GeroScience 2021; 44:1129-1140. [PMID: 34436732 PMCID: PMC9135902 DOI: 10.1007/s11357-021-00431-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Accepted: 08/04/2021] [Indexed: 11/13/2022] Open
Abstract
The rs2802292, rs2764264 and rs13217795 variants of FOXO3 have been associated with extreme longevity in multiple human populations, but the mechanisms underpinning this remain unclear. We aimed to characterise potential effects of longevity-associated variation on the expression and mRNA processing of the FOXO3 gene. We performed a comprehensive assessment of FOXO3 isoform usage across a wide variety of human tissues and carried out a bioinformatic analysis of the potential for longevity-associated variants to disrupt regulatory regions involved in isoform choice. We then related the expression of full length and 5′ truncated FOXO3 isoforms to rs13217795 genotype in peripheral blood and skeletal muscle from individuals of different rs13217795 genotypes. FOXO3 isoforms displayed considerable tissue specificity. We determined that rs13231195 and its tightly aligned proxy variant rs9400239 may lie in regulatory regions involved in isoform choice. The longevity allele at rs13217795 was associated with increased levels of full length FOXO3 isoforms in peripheral blood and a decrease in truncated FOXO3 isoforms in skeletal muscle RNA. We suggest that the longevity effect of FOXO3 SNPs may in part derive from a shift in isoform usage in skeletal muscle away from the production of 5′ truncated FOXO3 isoforms lacking a complete forkhead DNA binding domain, which may have compromised functionality.
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Affiliation(s)
- Ryan Frankum
- Institute of Biomedical and Clinical Science, University of Exeter Medical School, Barrack Road, Exeter, EX2 5DW, UK
| | - Tom S O Jameson
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Bridget A Knight
- NIHR Exeter Clinical Research Facility, Royal Devon and Exeter NHS Foundation Trust, Exeter, UK
| | - Francis B Stephens
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Benjamin T Wall
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Timothy A Donlon
- Honolulu Heart Program (HHP)/Honolulu-Asia Aging Study (HAAS), Department of Research, Kuakini Medical Center, Honolulu, HI, 96817, USA.,Departments of Cell & Molecular Biology and Pathology, University of Hawaii, Honolulu, HI, 96813, USA
| | - Trevor Torigoe
- Institute for Biogenesis Research, Department of Anatomy, Biochemistry and Physiology, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, USA
| | - Bradley J Willcox
- Department of Geriatric Medicine, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, 96817, USA.,Department of Research, Kuakini Medical Center, Honolulu, HI, 96817, USA
| | - D Craig Willcox
- Institute for Biogenesis Research, Department of Anatomy, Biochemistry and Physiology, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, USA.,Okinawa International University, Okinawa, Japan
| | - Richard C Allsopp
- Institute for Biogenesis Research, Department of Anatomy, Biochemistry and Physiology, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, USA
| | - Lorna W Harries
- Institute of Biomedical and Clinical Science, University of Exeter Medical School, Barrack Road, Exeter, EX2 5DW, UK.
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10
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Yang S, Pang L, Dai W, Wu S, Ren T, Duan Y, Zheng Y, Bi S, Zhang X, Kong J. Role of Forkhead Box O Proteins in Hepatocellular Carcinoma Biology and Progression (Review). Front Oncol 2021; 11:667730. [PMID: 34123834 PMCID: PMC8190381 DOI: 10.3389/fonc.2021.667730] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Accepted: 04/28/2021] [Indexed: 12/23/2022] Open
Abstract
Hepatocellular carcinoma (HCC), the most common type of malignant tumor of the digestive system, is associated with high morbidity and mortality. The main treatment for HCC is surgical resection. Advanced disease, recurrence, and metastasis are the main factors affecting prognosis. Chemotherapy and radiotherapy are not sufficiently efficacious for the treatment of primary and metastatic HCC; therefore, optimizing targeted therapy is essential for improving outcomes. Forkhead box O (FOXO) proteins are widely expressed in cells and function to integrate a variety of growth factors, oxidative stress signals, and other stimulatory signals, thereby inducing the specific expression of downstream signal factors and regulation of the cell cycle, senescence, apoptosis, oxidative stress, HCC development, and chemotherapy sensitivity. Accordingly, FOXO proteins are considered multifunctional targets of cancer treatment. The current review discusses the roles of FOXO proteins, particularly FOXO1, FOXO3, FOXO4, and FOXO6, in HCC and establishes a theoretical basis for the potential targeted therapy of HCC.
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Affiliation(s)
- Shaojie Yang
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang, China
| | - Liwei Pang
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang, China
| | - Wanlin Dai
- Innovation Institute of China Medical University, Shenyang, China
| | - Shuodong Wu
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang, China
| | - Tengqi Ren
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang, China
| | - Yunlong Duan
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang, China
| | - Yuting Zheng
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang, China
| | - Shiyuan Bi
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang, China
| | - Xiaolin Zhang
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang, China
| | - Jing Kong
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang, China
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11
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Lee BK, Hyun SW, Jung YS. Yuzu and Hesperidin Ameliorate Blood-Brain Barrier Disruption during Hypoxia via Antioxidant Activity. Antioxidants (Basel) 2020; 9:antiox9090843. [PMID: 32916895 PMCID: PMC7555663 DOI: 10.3390/antiox9090843] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 08/31/2020] [Accepted: 09/08/2020] [Indexed: 12/14/2022] Open
Abstract
Yuzu and its main component, hesperidin (HSP), have several health benefits owing to their anti-inflammatory and antioxidant properties. We examined the effects of yuzu and HSP on blood-brain barrier (BBB) dysfunction during ischemia/hypoxia in an in vivo animal model and an in vitro BBB endothelial cell model, and also investigated the underlying mechanisms. In an in vitro BBB endothelial cell model, BBB permeability was determined by measurement of Evans blue extravasation in vivo and in vitro. The expression of tight junction proteins, such as claudin-5 and zonula occludens-1 (ZO-1), was detected by immunochemistry and western blotting, and the reactive oxygen species (ROS) level was measured by 2'7'-dichlorofluorescein diacetate intensity. Yuzu and HSP significantly ameliorated the increase in BBB permeability and the disruption of claudin-5 and ZO-1 in both in vivo and in vitro models. In bEnd.3 cells, yuzu and HSP were shown to inhibit the disruption of claudin-5 and ZO-1 during hypoxia, and the protective effects of yuzu and HSP on claudin-5 degradation seemed to be mediated by Forkhead box O 3a (FoxO3a) and matrix metalloproteinase (MMP)-3/9. In addition, well-known antioxidants, trolox and N-acetyl cysteine, significantly attenuated the BBB permeability increase, disruption of claudin-5 and ZO-1, and FoxO3a activation during hypoxia, suggesting that ROS are important mediators of BBB dysfunction during hypoxia. Collectively, these results indicate that yuzu and HSP protect the BBB against dysfunction via maintaining integrity of claudin-5 and ZO-1, and these effects of yuzu and HSP appear to be a facet of their antioxidant properties. Our findings may contribute to therapeutic strategies for BBB-associated neurodegenerative diseases.
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Affiliation(s)
- Bo Kyung Lee
- College of Pharmacy, Ajou University, Suwon 16499, Korea, (S.-W.H.)
| | - Soo-Wang Hyun
- College of Pharmacy, Ajou University, Suwon 16499, Korea, (S.-W.H.)
| | - Yi-Sook Jung
- College of Pharmacy, Ajou University, Suwon 16499, Korea, (S.-W.H.)
- Research Institute of Pharmaceutical Sciences and Technology, Ajou University, Suwon 16499, Korea
- Correspondence: ; Tel.: +82-31-219-3444
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12
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Abstract
Forkhead box O (FOXO) transcription factors regulate diverse biological processes, affecting development, metabolism, stem cell maintenance and longevity. They have also been increasingly recognised as tumour suppressors through their ability to regulate genes essential for cell proliferation, cell death, senescence, angiogenesis, cell migration and metastasis. Mechanistically, FOXO proteins serve as key connection points to allow diverse proliferative, nutrient and stress signals to converge and integrate with distinct gene networks to control cell fate, metabolism and cancer development. In consequence, deregulation of FOXO expression and function can promote genetic disorders, metabolic diseases, deregulated ageing and cancer. Metastasis is the process by which cancer cells spread from the primary tumour often via the bloodstream or the lymphatic system and is the major cause of cancer death. The regulation and deregulation of FOXO transcription factors occur predominantly at the post-transcriptional and post-translational levels mediated by regulatory non-coding RNAs, their interactions with other protein partners and co-factors and a combination of post-translational modifications (PTMs), including phosphorylation, acetylation, methylation and ubiquitination. This review discusses the role and regulation of FOXO proteins in tumour initiation and progression, with a particular emphasis on cancer metastasis. An understanding of how signalling networks integrate with the FOXO transcription factors to modulate their developmental, metabolic and tumour-suppressive functions in normal tissues and in cancer will offer a new perspective on tumorigenesis and metastasis, and open up therapeutic opportunities for malignant diseases.
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Affiliation(s)
- Yannasittha Jiramongkol
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, W12 0NN, UK
| | - Eric W-F Lam
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, W12 0NN, UK.
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13
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Zhang Y, Yuan T, Su Z, Wang X, Wang Y, Ni Y, Zuo Y, Gu H. Reduced methylation of PP2Ac promotes ethanol-induced lipid accumulation through FOXO1 phosphorylation in vitro and in vivo. Toxicol Lett 2020; 331:65-74. [PMID: 32492475 DOI: 10.1016/j.toxlet.2020.05.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 04/21/2020] [Accepted: 05/28/2020] [Indexed: 12/12/2022]
Abstract
Although disturbance of the methionine cycle and sequent decrease in hepatic methylation capacity are known to be important factors in the development of alcoholic liver injury, the underlying mechanisms are not fully understood. Here, we investigated the importance of the methylation of protein phosphatase 2A (PP2A) in alcoholic liver disease (ALD). We found that the severity of ethanol-induced liver injury and the extent of demethylation of PP2A catalytic C subunit (PP2Ac) were reduced after treatment with betaine, a methyl donor involved in the methionine-homocysteine cycle. These results suggest that PP2Ac methylation is decreased due to a broad decrease in hepatic methylation capacity after exposure to ethanol. Moreover, we found that the reduction in PP2Ac methylation led to increased degradation of the regulatory Bα subunit, thus promoting the phosphorylation and nuclear exclusion of Forkhead box O1 (FOXO1) and reducing FOXO1 transcriptional activity. Ultimately, the reduced activity of FOXO1 led to increased expression of TXNIP, which caused hepatic lipid accumulation. Our findings suggest that the reduction of PP2A methylation, a result of decrease hepatic methylation capacity, played an important role in ethanol-induced lipid accumulation via down-regulation of PP2A/Bα and FOXO1 phosphorylation.
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Affiliation(s)
- Yali Zhang
- Department of Biochemistry and Molecular Biology, School of Medicine, Nantong University, Nantong, Jiangsu 226001, China.
| | - Tianli Yuan
- Department of Biochemistry and Molecular Biology, School of Medicine, Nantong University, Nantong, Jiangsu 226001, China
| | - Zhangyao Su
- Department of Biochemistry and Molecular Biology, School of Medicine, Nantong University, Nantong, Jiangsu 226001, China
| | - Xi Wang
- Department of Biochemistry and Molecular Biology, School of Medicine, Nantong University, Nantong, Jiangsu 226001, China
| | - Yilun Wang
- Department of Biochemistry and Molecular Biology, School of Medicine, Nantong University, Nantong, Jiangsu 226001, China
| | - Yao Ni
- Department of Biochemistry and Molecular Biology, School of Medicine, Nantong University, Nantong, Jiangsu 226001, China
| | - Yue Zuo
- Department of Biochemistry and Molecular Biology, School of Medicine, Nantong University, Nantong, Jiangsu 226001, China
| | - Haohao Gu
- Department of Biochemistry and Molecular Biology, School of Medicine, Nantong University, Nantong, Jiangsu 226001, China
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Adipose Tissue and FoxO1: Bridging Physiology and Mechanisms. Cells 2020; 9:cells9040849. [PMID: 32244542 PMCID: PMC7226803 DOI: 10.3390/cells9040849] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 03/23/2020] [Accepted: 03/30/2020] [Indexed: 12/22/2022] Open
Abstract
Forkhead box O class proteins (FoxOs) are expressed nearly in all tissues and are involved in different functions such as energy metabolism, redox homeostasis, differentiation, and cell cycle arrest. The plasticity of FoxOs is demonstrated by post-translational modifications that determine diverse levels of transcriptional regulations also controlled by their subcellular localization. Among the different members of the FoxO family, we will focus on FoxO1 in adipose tissue, where it is abundantly expressed and is involved in differentiation and transdifferentiation processes. The capability of FoxO1 to respond differently in dependence of adipose tissue subtype underlines the specific involvement of the transcription factor in energy metabolism and the “browning” process of adipocytes. FoxO1 can localize to nuclear, cytoplasm, and mitochondrial compartments of adipocytes responding to different availability of nutrients and source of reactive oxygen species (ROS). Specifically, fasted state produced-ROS enhance the nuclear activity of FoxO1, triggering the transcription of lipid catabolism and antioxidant response genes. The enhancement of lipid catabolism, in combination with ROS buffering, allows systemic energetic homeostasis and metabolic adaptation of white/beige adipocytes. On the contrary, a fed state induces FoxO1 to accumulate in the cytoplasm, but also in the mitochondria where it affects mitochondrial DNA gene expression. The importance of ROS-mediated signaling in FoxO1 subcellular localization and retrograde communication will be discussed, highlighting key aspects of FoxO1 multifaceted regulation in adipocytes.
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15
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Sun Y, Fu L, Xue F, Li Y, Xu H, Chen J. Digital gene expression profiling and validation study highlight Cyclin F as an important regulator for sperm motility of chickens. Poult Sci 2019; 98:5118-5126. [PMID: 31329967 DOI: 10.3382/ps/pez212] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 03/21/2019] [Indexed: 12/13/2022] Open
Abstract
In poultry industry, around 5 to 12% roosters were eliminated from the breeding program because of low sperm motility. Relatively few studies have been directed toward understanding and explaining the genetics mechanisms involved in sperm motility regulation in chickens. In the present study, digital gene expression (DGE) profiling and bioinformation analysis were used to explore the globally differentially expressed genes (DEG) in the testis of low sperm motility and high sperm motility roosters. Further validation study of key candidate genes was also performed. The DGE identified 652 DEGs, including 473 up-regulated and 179 down-regulated genes in the low sperm motility testis. Those DEGs were enriched on 21 terms of biological process category, 10 terms of cellular component category, including motile cilium, and 13 terms of molecular function category including microtubule motor activity and ATP binding. The kyoto encyclopedia of genes and genomes (KEGG) enrichment analysis indicated that these DEGs were involved in the FoxO signaling pathway and insulin resistance pathway. Quantitative real time PCR (qRT-PCR) studies of 8 DEGs were used to validate the DGE results. A key candidate gene Cyclin F (CCNF) was extremely low expressed in the low sperm motility testis (log2 ratio (low sperm motility/high sperm motility) = -5.23). The CCNF gene silencing in the chicken DF-1 cell line induced the reduced cell activity and proliferation. In summary, the present study provides insight into the potential genetic regulation of sperm motility and highlighted the underlying pathways (Insulin resistance and FoxO signaling pathways) and important candidate genes such as CCNF.
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Affiliation(s)
| | - Li Fu
- Key Laboratory of Animal (Poultry) Genetics Breeding and Reproduction, Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Fuguang Xue
- Key Laboratory of Animal (Poultry) Genetics Breeding and Reproduction, Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Yunlei Li
- Key Laboratory of Animal (Poultry) Genetics Breeding and Reproduction, Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Hong Xu
- Key Laboratory of Animal (Poultry) Genetics Breeding and Reproduction, Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Jilan Chen
- Key Laboratory of Animal (Poultry) Genetics Breeding and Reproduction, Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
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Chen D, Yang Y, Yang P. Quxie Capsule Inhibits Colon Tumor Growth Partially Through Foxo1-Mediated Apoptosis and Immune Modulation. Integr Cancer Ther 2019; 18:1534735419846377. [PMID: 31030593 PMCID: PMC6488785 DOI: 10.1177/1534735419846377] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Quxie capsule (QX), a herbal remedy used in traditional Chinese medicine, is routinely used in advanced colorectal cancer treatment in Xiyuan Hospital in Beijing, China. However, the mechanism(s) underlying the effect of QX in colorectal cancer remain unclear, which hampers the optimal use of QX for the treatment of the disease. The transcription factor forkhead box O1 (Foxo1) plays important roles in regulation of cell cycle, apoptosis, and immune response in various cancers. In this study, we examined the antitumor efficacy of QX in a mouse model of colorectal cancer and further investigated the mechanism by which QX regulated Foxo1 protein-mediated pathways. QX administered via gavage daily for 2 weeks in mice carrying CT26 mouse colon tumors resulted in significantly lower mean tumor weight (0.93 ± 0.32 g) compared with that in vehicle control-treated mice (1.57 ± 0.57 g, P <.05). Foxo1 protein expression in tumors was also higher in the QX group than that in the vehicle control group. Furthermore, QX treatment upregulated apoptotic proteins such as Fas, Bim, and cleaved caspase-3 in tumor tissue compared with those in the vehicle control group. Intriguingly, the ratios of Th1/Th2 and Th17/Treg cells and levels of T-bet protein (the key regulator of Th1 and Th2 cells) were higher while the level of Foxp3 (the key regulator of Treg cells) was lower in QX-treated mice compared to vehicle control mice, revealing that Foxo1 upregulated T-bet and downregulated Foxp3 and induced a shift in immune balance. This shift could be critical in the antitumor efficacy of QX. Furthermore, knocking down Foxo1 in human colon cancer HCT116 cells partially blocked the effect of QX-elicited antiproliferative activity. Together, these results suggest that QX exerts antitumor activity in CT26 mouse colon cancer model partially mediated by Foxo1-induced apoptosis and antitumor immune response.
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Affiliation(s)
- Dongmei Chen
- 1 Beijing University of Chinese Medicine, Beijing, China.,2 The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,3 Xiyuan Hospital of China Academy of Chinese Medical Sciences, Beijing, China
| | - Yufei Yang
- 3 Xiyuan Hospital of China Academy of Chinese Medical Sciences, Beijing, China
| | - Peiying Yang
- 2 The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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Rajendran NK, Dhilip Kumar SS, Houreld NN, Abrahamse H. Understanding the perspectives of forkhead transcription factors in delayed wound healing. J Cell Commun Signal 2019; 13:151-162. [PMID: 30088222 PMCID: PMC6498300 DOI: 10.1007/s12079-018-0484-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 08/01/2018] [Indexed: 01/20/2023] Open
Abstract
Wound healing is a complex overlapping biological process that involves a sequence of events coordinated by various cells, proteins, growth factors, cytokines and signaling molecules. Recent evidence indicates that forkhead box O1 (FOXO1) transcription factors play an important role in organizing these events to stimulate wound healing. The ubiquitously expressed forkhead box, class O (FOXO) transcription factors act as cell signaling molecules in various transcriptional processes that are involved in diverse cellular activities, including cell death, cell differentiation, DNA repair, apoptosis, and oxidative stress in response to stimuli, and interact with numerous proteins. Due to the activation of FOXO targeted genes, FOXOs are involved in maintaining the balance between oxidative stress and antioxidants. In humans, different isoforms of FOXO namely FOXO1, FOXO3, FOXO4 and FOXO6 are present, however only FOXO1 and FOXO3 possess biological functions such as morphogenesis, maintenance and tissue regeneration. This might make FOXOs an important therapeutic target to enhance wound healing in diabetes, and to avoid over scarring. In spite of extensive literature, little is known regarding the role of FOXO and its relationship in wound healing. This review provides a summary of FOXO proteins and their biological role in wound healing and oxidative stress.
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Affiliation(s)
- Naresh Kumar Rajendran
- Laser Research Centre, Faculty of Health Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein, 2028, South Africa
| | - Sathish Sundar Dhilip Kumar
- Laser Research Centre, Faculty of Health Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein, 2028, South Africa
| | - Nicolette Nadene Houreld
- Laser Research Centre, Faculty of Health Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein, 2028, South Africa.
| | - Heidi Abrahamse
- Laser Research Centre, Faculty of Health Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein, 2028, South Africa
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18
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Adiguzel D, Sahin P, Kuscu N, Ozkavukcu S, Bektas NI, Celik-Ozenci C. Spatiotemporal expression and regulation of FoxO1 in mouse uterus during peri-implantation period. PLoS One 2019; 14:e0216814. [PMID: 31120913 PMCID: PMC6532854 DOI: 10.1371/journal.pone.0216814] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 04/29/2019] [Indexed: 11/19/2022] Open
Abstract
Recent studies indicate that FoxO1 has roles in female reproductive system, especially in maternal endometrium. Although various cellular aspects and molecular pathways have been identified, the exact molecular characteristics of embryo implantation are still not completely understood. In this study, we aimed to investigate uterine expression and regulation of FoxO1 during peri-implantation period in mice. Experimental mouse models including, normal pregnancy, pseudopregnancy, artificial decidualization, and delayed implantation and activation were performed. Our results showed that FoxO1 expression was spatiotemporal in mouse endometrial tissue throughout peri-implantation period and its expression was significantly upregulated in luminal and glandular epithelium at the time of implantation. Moreover, on day 5 morning (09:00 AM) of pregnancy, expression of FoxO1 was cytoplasmic in endometrial luminal epithelial cells where embryo homing takes place. With progressing time on day 5 evening (19:00 PM) of pregnancy FoxO1 expression was nuclear in luminal epithelium at implantation site. Pseudopregnancy and artificial decidualization models indicated that FoxO1 expression was regulated by pregnancy hormones. Delayed implantation and activation model indicated that FoxO1 expression at the time of implantation is dependent upon activation status of blastocyst due to E2 induction and uterine sensitivity to implantation. In conclusion, our findings highlight a perspective for FoxO1 expression and regulation in mouse uterus during peri-implantation period indicating that its expression is regulated by implanting embryo and pregnancy hormones.
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Affiliation(s)
- Dileyra Adiguzel
- Department of Histology and Embryology, School of Medicine, Akdeniz University, Campus, Antalya, Turkey
| | - Pinar Sahin
- Department of Histology and Embryology, School of Medicine, Akdeniz University, Campus, Antalya, Turkey
| | - Nilay Kuscu
- Department of Histology and Embryology, School of Medicine, Akdeniz University, Campus, Antalya, Turkey
| | - Sinan Ozkavukcu
- Department of Obstetrics and Gynecology, Centre for Assisted Reproduction, School of Medicine, Ankara University, Ankara, Turkey
| | - Nayce Ilayda Bektas
- Department of Histology and Embryology, School of Medicine, Akdeniz University, Campus, Antalya, Turkey
| | - Ciler Celik-Ozenci
- Department of Histology and Embryology, School of Medicine, Akdeniz University, Campus, Antalya, Turkey
- * E-mail:
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19
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Chen J, Lu Y, Tian M, Huang Q. Molecular mechanisms of FOXO1 in adipocyte differentiation. J Mol Endocrinol 2019; 62:R239-R253. [PMID: 30780132 DOI: 10.1530/jme-18-0178] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 02/05/2019] [Indexed: 12/14/2022]
Abstract
Forkhead box-O1 (FOXO1) is a downstream target of AKT and plays crucial roles in cell cycle control, apoptosis, metabolism and adipocyte differentiation. It is thought that FOXO1 affects adipocyte differentiation by regulating lipogenesis and cell cycle. With the deepening in the understanding of this field, it is currently believed that FOXO1 translocation between nuclei and cytoplasm is involved in the regulation of FOXO1 activity, thus affecting adipocyte differentiation. Translocation of FOXO1 depends on its post-translational modifications and interactions with 14-3-3. Based on these modifications and interactions, FOXO1 could regulate lipogenesis through PPARγ and the adipocyte cell cycle through p21 and p27. In this review, we aim to provide a comprehensive FOXO1 regulation network in adipocyte differentiation by linking together distinct functions mentioned above to explain their effects on adipocyte differentiation and to emphasize the regulatory role of FOXO1. In addition, we also focus on the novel findings such as the use of miRNAs in FOXO1 regulation and highlight the improvable issues, such as RNA modifications, for future research in the field.
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Affiliation(s)
- Junye Chen
- Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi Province, People's Republic of China
- Nanchang Joint Programme, Queen Mary, University of London, London, UK
| | - Yi Lu
- Key Provincial Laboratory of Basic Pharmacology, Nanchang University, Nanchang, Jiangxi Province, People's Republic of China
- Department of Pharmacology, School of Pharmacy, Nanchang University, Nanchang, Jiangxi Province, People's Republic of China
| | - Mengyuan Tian
- Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi Province, People's Republic of China
- Nanchang Joint Programme, Queen Mary, University of London, London, UK
| | - Qiren Huang
- Key Provincial Laboratory of Basic Pharmacology, Nanchang University, Nanchang, Jiangxi Province, People's Republic of China
- Department of Pharmacology, School of Pharmacy, Nanchang University, Nanchang, Jiangxi Province, People's Republic of China
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20
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Abstract
OBJECTIVES Menin, a chromatin binding protein, interacts with various epigenetic regulators to regulate gene transcription, whereas forkhead box protein O1 (FOXO1) is a transcription factor that can be regulated by multiple signaling pathways. Both menin and FOXO1 are crucial regulators of β-cell function and metabolism; however, whether or how they interplay to regulate β cells is not clear. METHODS To examine whether menin affects expression of FOXO1, we ectopically expressed menin complementary DNA and small hairpin RNA targeting menin via a retroviral vector in INS-1 cells. Western blotting was used to analyze protein levels. RESULTS Our current work shows that menin increases the expression of FOXO1. Menin stabilizes FOXO1 protein level in INS-1 cells, as shown by increased half-life of FOXO1 by menin expression. Moreover, menin represses ubiquitination of FOXO1 protein and AKT phosphorylation, We found that menin stabilizes FOXO1 by repressing FOXO1 degradation mediated by S-phase kinase-associated protein 2 (Skp2), an E3 ubiquitin ligase, promoting caspase 3 activation and apoptosis. CONCLUSIONS Because FOXO1 upregulates the menin gene transcription, our findings unravel a crucial menin and FOXO1 interplay, with menin and FOXO1 upregulating their expression reciprocally, forming a positive feedback loop to sustain menin and FOXO1 expression.
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21
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Role of Forkhead Box O (FOXO) transcription factor in aging and diseases. Gene 2018; 648:97-105. [PMID: 29428128 DOI: 10.1016/j.gene.2018.01.051] [Citation(s) in RCA: 106] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2017] [Revised: 12/26/2017] [Accepted: 01/14/2018] [Indexed: 12/21/2022]
Abstract
Fork head box O (FOXO) transcription factor is a key player in an evolutionarily conserved pathway. The mammalian FOXO family consists of FOXO1, 3, 4 and 6, are highly similar in their structure, function and regulation. To maintain optimum body function, the organisms have developed complex mechanisms for homeostasis. Importantly, it is well known that when these mechanisms dysregulate it results in the development of age-related disease. FOXO proteins are involved in a diverse cellular function and also have clinical significance including cell cycle arrest, cell differentiation, tumour suppression, DNA repair, longevity, diabetic complications, immunity, wound healing, regulation of metabolism and thus treatment of several types of diseases. By the combinations of post-translational modifications FOXO's serve as a 'molecular code' to sense external stimuli and recruit it as to specific regions of the genome and provide an integrated cellular response to changing physiological conditions. Akt/Protein kinase B a signaling pathway as a main regulator of FOXO to perform a diverse function in organisms. The present review summarizes the molecular and clinical aspects of FOXO transcription factor. And also elaborate the interaction of FOXO with the nucleosome remodelling complex to target genes, which is essential to cellular homeostasis.
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22
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Miller WP, Yang C, Mihailescu ML, Moore JA, Dai W, Barber AJ, Dennis MD. Deletion of the Akt/mTORC1 Repressor REDD1 Prevents Visual Dysfunction in a Rodent Model of Type 1 Diabetes. Diabetes 2018; 67:110-119. [PMID: 29074598 PMCID: PMC5741149 DOI: 10.2337/db17-0728] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 10/20/2017] [Indexed: 12/25/2022]
Abstract
Diabetes-induced visual dysfunction is associated with significant neuroretinal cell death. The current study was designed to investigate the role of the Protein Regulated in Development and DNA Damage Response 1 (REDD1) in diabetes-induced retinal cell death and visual dysfunction. We recently demonstrated that REDD1 protein expression was elevated in response to hyperglycemia in the retina of diabetic rodents. REDD1 is an important regulator of Akt and mammalian target of rapamycin and as such plays a key role in neuronal function and survival. In R28 retinal cells in culture, hyperglycemic conditions enhanced REDD1 protein expression concomitant with caspase activation and cell death. By contrast, in REDD1-deficient R28 cells, neither hyperglycemic conditions nor the absence of insulin in culture medium were sufficient to promote cell death. In the retinas of streptozotocin-induced diabetic mice, retinal apoptosis was dramatically elevated compared with nondiabetic controls, whereas no difference was observed in diabetic and nondiabetic REDD1-deficient mice. Electroretinogram abnormalities observed in b-wave and oscillatory potentials of diabetic wild-type mice were also absent in REDD1-deficient mice. Moreover, diabetic wild-type mice exhibited functional deficiencies in visual acuity and contrast sensitivity, whereas diabetic REDD1-deficient mice had no visual dysfunction. The results support a role for REDD1 in diabetes-induced retinal neurodegeneration.
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Affiliation(s)
- William P Miller
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA
| | - Chen Yang
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA
| | - Maria L Mihailescu
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA
| | - Joshua A Moore
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA
| | - Weiwei Dai
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA
| | - Alistair J Barber
- Department of Ophthalmology, Penn State College of Medicine, Hershey, PA
| | - Michael D Dennis
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA
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Chen P, Xu S, Qu J. Lycopene Protects Keratinocytes Against UVB Radiation‐Induced Carcinogenesis via Negative Regulation of FOXO3a Through the mTORC2/AKT Signaling Pathway. J Cell Biochem 2017; 119:366-377. [DOI: 10.1002/jcb.26189] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 06/05/2017] [Indexed: 12/20/2022]
Affiliation(s)
- Ping Chen
- Department of PharmacyAffiliated Hospital of Shandong Medical CollegeLinyi276000Shandong ProvinceChina
| | - Shina Xu
- Department of PharmacyAffiliated Hospital of Shandong Medical CollegeLinyi276000Shandong ProvinceChina
| | - Jinlong Qu
- Department of DermatologyLinyi Central HospitalYishui CountyLinyi276400Shandong ProvinceChina
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24
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Molecular signaling cascades involved in nonmelanoma skin carcinogenesis. Biochem J 2017; 473:2973-94. [PMID: 27679857 DOI: 10.1042/bcj20160471] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 06/10/2016] [Indexed: 12/17/2022]
Abstract
Nonmelanoma skin cancer (NMSC) is the most common cancer worldwide and the incidence continues to rise, in part due to increasing numbers in high-risk groups such as organ transplant recipients and those taking photosensitizing medications. The most significant risk factor for NMSC is ultraviolet radiation (UVR) from sunlight, specifically UVB, which is the leading cause of DNA damage, photoaging, and malignant transformation in the skin. Activation of apoptosis following UVR exposure allows the elimination of irreversibly damaged cells that may harbor oncogenic mutations. However, UVR also activates signaling cascades that promote the survival of these potentially cancerous cells, resulting in tumor initiation. Thus, the UVR-induced stress response in the skin is multifaceted and requires coordinated activation of numerous pathways controlling DNA damage repair, inflammation, and kinase-mediated signal transduction that lead to either cell survival or cell death. This review focuses on the central signaling mechanisms that respond to UVR and the subsequent cellular changes. Given the prevalence of NMSC and the resulting health care burden, many of these pathways provide promising targets for continued study aimed at both chemoprevention and chemotherapy.
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Zheng Q, Wang H, Wang Z, Liu J, Zhang Q, Zhang L, Lu Y, You H, Jin G. Reprogramming of histone methylation controls the differentiation of monocytes into macrophages. FEBS J 2017; 284:1309-1323. [DOI: 10.1111/febs.14060] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Revised: 02/04/2017] [Accepted: 03/13/2017] [Indexed: 12/14/2022]
Affiliation(s)
- Qi‐Fan Zheng
- Department of Basic Medical Sciences Medical College Xiamen University China
- State Key Laboratory of Cellular Stress Biology Xiamen University China
- Fujian Provincial Key Laboratory of chronic liver disease and hepatocellular carcinoma Xiamen University China
| | - Hui‐Min Wang
- Department of Basic Medical Sciences Medical College Xiamen University China
| | - Zhan‐Feng Wang
- Department of Neurosurgery China‐Japan Union Hospital Jilin University Changchun China
| | - Jin‐Yang Liu
- Department of Basic Medical Sciences Medical College Xiamen University China
| | - Qi Zhang
- Department of Basic Medical Sciences Medical College Xiamen University China
| | - Li Zhang
- Department of Basic Medical Sciences Medical College Xiamen University China
| | - Yuan‐Hua Lu
- Department of Basic Medical Sciences Medical College Xiamen University China
| | - Han You
- State Key Laboratory of Cellular Stress Biology Xiamen University China
| | - Guang‐Hui Jin
- Department of Basic Medical Sciences Medical College Xiamen University China
- State Key Laboratory of Cellular Stress Biology Xiamen University China
- Fujian Provincial Key Laboratory of chronic liver disease and hepatocellular carcinoma Xiamen University China
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Abstract
The MST1 and MST2 protein kinases comprise the GCK-II subfamily of protein kinases. In addition to their amino-terminal kinase catalytic domain, related to that of the Saccharomyces cerevisiae protein kinase Ste20, their most characteristic feature is the presence near the carboxy terminus of a unique helical structure called a SARAH domain; this segment allows MST1/MST2 to homodimerize and to heterodimerize with the other polypeptides that contain SARAH domains, the noncatalytic polypeptides RASSF1-6 and Sav1/WW45. Early studies emphasized the potent ability of MST1/MST2 to induce apoptosis upon being overexpressed, as well as the conversion of the endogenous MST1/MST2 polypeptides to constitutively active, caspase-cleaved catalytic fragments during apoptosis initiated by any stimulus. Later, the cleaved, constitutively active form of MST1 was identified in nonapoptotic, quiescent adult hepatocytes as well as in cells undergoing terminal differentiation, where its presence is necessary to maintain those cellular states. The physiologic regulation of full length MST1/MST2 is controlled by the availability of its noncatalytic SARAH domain partners. Interaction with Sav1/WW45 recruits MST1/MST2 into a tumor suppressor pathway, wherein it phosphorylates and activates the Sav1-bound protein kinases Lats1/Lats2, potent inhibitors of the Yap1 and TAZ oncogenic transcriptional regulators. A constitutive interaction with the Rap1-GTP binding protein RASSF5B (Nore1B/RAPL) in T cells recruits MST1 (especially) and MST2 as an effector of Rap1's control of T cell adhesion and migration, a program crucial to immune surveillance and response; loss of function mutation in human MST1 results in profound immunodeficiency. MST1 and MST2 are also regulated by other protein kinases, positively by TAO1 and negatively by Par1, SIK2/3, Akt, and cRaf1. The growing list of candidate MST1/MST2 substrates suggests that the full range of MST1/MST2's physiologic programs and contributions to pathophysiology remains to be elucidated.
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Affiliation(s)
- Jacob A. Galan
- Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
- Diabetes Unit and Medical Services, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
- Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Joseph Avruch
- Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
- Diabetes Unit and Medical Services, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
- Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115, United States
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Chen B, Wu Q, Xiong Z, Ma Y, Yu S, Chen D, Huang S, Dong Y. Adenosine monophosphate-activated protein kinase attenuates cardiomyocyte hypertrophy through regulation of FOXO3a/MAFbx signaling pathway. Acta Biochim Biophys Sin (Shanghai) 2016; 48:827-32. [PMID: 27521792 DOI: 10.1093/abbs/gmw076] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 05/13/2016] [Indexed: 01/12/2023] Open
Abstract
Control of cardiac muscle mass is thought to be determined by a dynamic balance of protein synthesis and degradation. Recent studies have demonstrated that atrophy-related forkhead box O 3a (FOXO3a)/muscle atrophy F-box (MAFbx) signaling pathway plays a central role in the modulation of proteolysis and exert inhibitory effect on cardiomyocyte hypertrophy. In this study, we tested the hypothesis that adenosine monophosphate-activated protein kinase (AMPK) activation attenuates cardiomyocyte hypertrophy by regulating FOXO3a/MAFbx signaling pathway and its downstream protein degradation. The results showed that activation of AMPK with 5-aminoimidazole-4-carboxamide ribonucleoside (AICAR) attenuated cardiomyocyte hypertrophy induced by angiotensin II (Ang II). The antihypertrophic effects of AICAR were blunted by AMPK inhibitor Compound C. In addition, AMPK dramatically increased the activity of transcription factor FOXO3a, up-regulated the expression of its downstream ubiquitin ligase MAFbx, and enhanced cardiomyocyte proteolysis. Meanwhile, the effects of AMPK on protein degradation and cardiomyocyte hypertrophy were blocked after MAFbx was silenced by transfection of cardiomyocytes with MAFbx-siRNA. These results indicate that AMPK plays an important role in the inhibition of cardiomyocyte hypertrophy by activating protein degradation via FOXO3a/MAFbx signaling pathway.
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Affiliation(s)
- Baolin Chen
- Department of Cardiology, The Guizhou Provincial People's Hospital, Guiyang 550002, China
| | - Qiang Wu
- Department of Cardiology, The Guizhou Provincial People's Hospital, Guiyang 550002, China
| | - Zhaojun Xiong
- Department of Cardiology, The Third Affiliated hospital of Sun Yat-Sen University, Guangzhou 510080, China
| | - Yuedong Ma
- Department of Cardiology, The First Affiliated hospital of Sun Yat-Sen University, Guangzhou 510080, China Key Laboratory on Assisted Circulation, Ministry of Health, Guangzhou 510080, China
| | - Sha Yu
- Department of Cardiology, The Guizhou Provincial People's Hospital, Guiyang 550002, China
| | - Dandan Chen
- Department of Cardiology, The Guizhou Provincial People's Hospital, Guiyang 550002, China
| | - Shengwen Huang
- Department of Laboratory, The Guizhou Provincial People's Hospital, Guiyang 550002, China
| | - Yugang Dong
- Department of Cardiology, The First Affiliated hospital of Sun Yat-Sen University, Guangzhou 510080, China Key Laboratory on Assisted Circulation, Ministry of Health, Guangzhou 510080, China
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Non-transcriptional Function of FOXO1/DAF-16 Contributes to Translesion DNA Synthesis. Mol Cell Biol 2016; 36:2755-2766. [PMID: 27550812 DOI: 10.1128/mcb.00265-16] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Forkhead box O (FOXO; DAF-16 in nematode) transcription factors activate a program of genes that control stress resistance, metabolism, and lifespan. Given the adverse impact of the stochastic DNA damage on organismal development and ageing, we examined the role of FOXO/DAF-16 in UV-induced DNA-damage response. Knockdown of FOXO1, but not FOXO3a, increases sensitivity to UV irradiation when exposed during S phase, suggesting a contribution of FOXO1 to translesion DNA synthesis (TLS), a replicative bypass of UV-induced DNA lesions. Actually, FOXO1 depletion results in a sustained activation of the ATR-Chk1 signaling and a reduction of PCNA monoubiquitination following UV irradiation. FOXO1 does not alter the expression of TLS-related genes but binds to the protein replication protein A (RPA1) that coats single-stranded DNA and acts as a scaffold for TLS. In Caenorhabditis elegans, daf-16 null mutants show UV-induced retardation in larval development and are rescued by overexpressing DAF-16 mutant lacking transactivation domain, but not substitution mutant unable to interact with RPA-1. Thus, our findings demonstrate that FOXO1/DAF-16 is a functional component in TLS independently of its transactivation activity.
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Negative regulation of the FOXO3a transcription factor by mTORC2 induces a pro-survival response following exposure to ultraviolet-B irradiation. Cell Signal 2016; 28:798-809. [PMID: 27058291 DOI: 10.1016/j.cellsig.2016.03.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 03/16/2016] [Accepted: 03/28/2016] [Indexed: 12/30/2022]
Abstract
Exposure to ultraviolet-B (UVB) irradiation, the principal cause of non-melanoma skin cancer (NMSC), activates both the rapamycin-sensitive mammalian target of rapamycin complex 1 (mTORC1) and the rapamycin-resistant mTORC2. We have previously reported that UVB-induced keratinocyte survival is dependent on mTORC2, though the specific mechanism is not well understood. FOXO3a is an important transcription factor involved in regulating cell survival. The activity of FOXO3a is reduced as a result of protein kinase B (AKT/PKB) activation, which is downstream of mTORC2; however, the specific function of FOXO3a during UVB-induced apoptosis is unclear. In this study, we establish that in cells with wild-type mTORC2 activity, FOXO3a is quickly phosphorylated in response to UVB and sequestered in the cytoplasm. In contrast, loss of mTORC2 causes FOXO3a to be localized to the nucleus and sensitizes cells to UVB-induced apoptosis. Furthermore, this sensitization is rescued by knockdown of FOXO3a. Taken together, these studies provide strong evidence that inhibition of mTORC2 enhances UVB-induced apoptosis in a FOXO3a-dependent manner, and suggest that FOXO3a activation by mTORC2 inhibitors may be a valuable chemopreventive target in NMSC.
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Kučerová L, Kubrak OI, Bengtsson JM, Strnad H, Nylin S, Theopold U, Nässel DR. Slowed aging during reproductive dormancy is reflected in genome-wide transcriptome changes in Drosophila melanogaster. BMC Genomics 2016; 17:50. [PMID: 26758761 PMCID: PMC4711038 DOI: 10.1186/s12864-016-2383-1] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2015] [Accepted: 01/06/2016] [Indexed: 12/28/2022] Open
Abstract
Background In models extensively used in studies of aging and extended lifespan, such as C. elegans and Drosophila, adult senescence is regulated by gene networks that are likely to be similar to ones that underlie lifespan extension during dormancy. These include the evolutionarily conserved insulin/IGF, TOR and germ line-signaling pathways. Dormancy, also known as dauer stage in the larval worm or adult diapause in the fly, is triggered by adverse environmental conditions, and results in drastically extended lifespan with negligible senescence. It is furthermore characterized by increased stress resistance and somatic maintenance, developmental arrest and reallocated energy resources. In the fly Drosophila melanogaster adult reproductive diapause is additionally manifested in arrested ovary development, improved immune defense and altered metabolism. However, the molecular mechanisms behind this adaptive lifespan extension are not well understood. Results A genome wide analysis of transcript changes in diapausing D. melanogaster revealed a differential regulation of more than 4600 genes. Gene ontology (GO) and KEGG pathway analysis reveal that many of these genes are part of signaling pathways that regulate metabolism, stress responses, detoxification, immunity, protein synthesis and processes during aging. More specifically, gene readouts and detailed mapping of the pathways indicate downregulation of insulin-IGF (IIS), target of rapamycin (TOR) and MAP kinase signaling, whereas Toll-dependent immune signaling, Jun-N-terminal kinase (JNK) and Janus kinase/signal transducer and activator of transcription (JAK/STAT) pathways are upregulated during diapause. Furthermore, we detected transcriptional regulation of a large number of genes specifically associated with aging and longevity. Conclusions We find that many affected genes and signal pathways are shared between dormancy, aging and lifespan extension, including IIS, TOR, JAK/STAT and JNK. A substantial fraction of the genes affected by diapause have also been found to alter their expression in response to starvation and cold exposure in D. melanogaster, and the pathways overlap those reported in GO analysis of other invertebrates in dormancy or even hibernating mammals. Our study, thus, shows that D. melanogaster is a genetically tractable model for dormancy in other organisms and effects of dormancy on aging and lifespan. Electronic supplementary material The online version of this article (doi:10.1186/s12864-016-2383-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Lucie Kučerová
- Department of Molecular Biosciences, Wenner-Gren Institute, Stockholm, Sweden.
| | - Olga I Kubrak
- Department of Zoology, Stockholm University, S-106 91, Stockholm, Sweden.
| | - Jonas M Bengtsson
- Department of Zoology, Stockholm University, S-106 91, Stockholm, Sweden.
| | - Hynek Strnad
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
| | - Sören Nylin
- Department of Zoology, Stockholm University, S-106 91, Stockholm, Sweden.
| | - Ulrich Theopold
- Department of Molecular Biosciences, Wenner-Gren Institute, Stockholm, Sweden.
| | - Dick R Nässel
- Department of Zoology, Stockholm University, S-106 91, Stockholm, Sweden.
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Zhang Z, Wang M, Eisel F, Tchatalbachev S, Chakraborty T, Meinhardt A, Bhushan S. UropathogenicEscherichia coliEpigenetically Manipulate Host Cell Death Pathways. J Infect Dis 2015; 213:1198-207. [DOI: 10.1093/infdis/jiv569] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 11/19/2015] [Indexed: 11/14/2022] Open
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Glutathione suppresses cerebral infarct volume and cell death after ischemic injury: involvement of FOXO3 inactivation and Bcl2 expression. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:426069. [PMID: 25722793 PMCID: PMC4334940 DOI: 10.1155/2015/426069] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Revised: 01/18/2015] [Accepted: 01/27/2015] [Indexed: 01/27/2023]
Abstract
Ischemic stroke interrupts the flow of blood to the brain and subsequently results in cerebral infarction and neuronal cell death, leading to severe pathophysiology. Glutathione (GSH) is an antioxidant with cellular protective functions, including reactive oxygen species (ROS) scavenging in the brain. In addition, GSH is involved in various cellular survival pathways in response to oxidative stress. In the present study, we examined whether GSH reduces cerebral infarct size after middle cerebral artery occlusion in vivo and the signaling mechanisms involved in the promotion of cell survival after GSH treatment under ischemia/reperfusion conditions in vitro. To determine whether GSH reduces the extent of cerebral infarction, cell death after ischemia, and reperfusion injury, we measured infarct size in ischemic brain tissue and the expression of claudin-5 associated with brain infarct formation. We also examined activation of the PI3K/Akt pathway, inactivation of FOXO3, and expression of Bcl2 to assess the role of GSH in promoting cell survival in response to ischemic injury. Based on our results, we suggest that GSH might improve the pathogenesis of ischemic stroke by attenuating cerebral infarction and cell death.
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Genin EC, Caron N, Vandenbosch R, Nguyen L, Malgrange B. Concise review: forkhead pathway in the control of adult neurogenesis. Stem Cells 2015; 32:1398-407. [PMID: 24510844 DOI: 10.1002/stem.1673] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 01/09/2014] [Accepted: 01/09/2014] [Indexed: 12/23/2022]
Abstract
New cells are continuously generated from immature proliferating cells in the adult brain in two neurogenic niches known as the subgranular zone (SGZ) of the dentate gyrus (DG) of the hippocampus and the sub-ventricular zone (SVZ) of the lateral ventricles. However, the molecular mechanisms regulating their proliferation, differentiation, migration and functional integration of newborn neurons in pre-existing neural network remain largely unknown. Forkhead box (Fox) proteins belong to a large family of transcription factors implicated in a wide variety of biological processes. Recently, there has been accumulating evidence that several members of this family of proteins play important roles in adult neurogenesis. Here, we describe recent advances in our understanding of regulation provided by Fox factors in adult neurogenesis, and evaluate the potential role of Fox proteins as targets for therapeutic intervention in neurodegenerative diseases.
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Affiliation(s)
- Emmanuelle C Genin
- GIGA-Neurosciences, Developmental Neurobiology Unit, University of Liège, Liège, Belgium
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Xie Q, Peng S, Tao L, Ruan H, Yang Y, Li TM, Adams U, Meng S, Bi X, Dong MQ, Yuan Z. E2F transcription factor 1 regulates cellular and organismal senescence by inhibiting Forkhead box O transcription factors. J Biol Chem 2014; 289:34205-13. [PMID: 25344604 DOI: 10.1074/jbc.m114.587170] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
E2F1 and FOXO3 are two transcription factors that have been shown to participate in cellular senescence. Previous report reveals that E2F1 enhanced cellular senescence in human fibroblast cells, while FOXO transcription factors play against senescence by regulation reactive oxygen species scavenging proteins. However, their functional interplay has been unclear. Here we use E2F1 knock-out murine Embryonic fibroblasts (MEFs), knockdown RNAi constructs, and ectopic expression of E2F1 to show that it functions by negatively regulating FOXO3. E2F1 attenuates FOXO3-mediated expression of MnSOD and Catalase without affecting FOXO3 protein stability, subcellular localization, or phosphorylation by Akt. We mapped the interaction between E2F1 and FOXO3 to a region including the DNA binding domain of E2F1 and the C-terminal transcription-activation domain of FOXO3. We propose that E2F1 inhibits FOXO3-dependent transcription by directly binding FOXO3 in the nucleus and preventing activation of its target genes. Moreover, knockdown of the Caenorhabditis elegans E2F1 ortholog efl-1 significantly extends lifespan in a manner that requires the activity of the C. elegans FOXO gene daf-16. We conclude that there is an evolutionarily conserved signaling connection between E2F1 and FOXO3, which regulates cellular senescence and aging by regulating the activity of FOXO3. We speculate that drugs and/or therapies that inhibit this physical interaction might be good candidates for reducing cellular senescence and increasing longevity.
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Affiliation(s)
- Qi Xie
- From the State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Shengyi Peng
- From the State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China, College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049
| | - Li Tao
- National Institute of Biological Sciences, Beijing 102206, China
| | - Haihe Ruan
- From the State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Yanglu Yang
- From the State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China, College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049
| | - Tie-Mei Li
- National Institute of Biological Sciences, Beijing 102206, China
| | - Ursula Adams
- Biological Sciences, The University of Chicago, Chicago, Illinois 60637, and
| | - Songshu Meng
- Institute of Cancer Stem Cell, Dalian Medical University Cancer Center, Dalian 116044, China
| | - Xiaolin Bi
- Institute of Cancer Stem Cell, Dalian Medical University Cancer Center, Dalian 116044, China
| | - Meng-Qiu Dong
- National Institute of Biological Sciences, Beijing 102206, China
| | - Zengqiang Yuan
- From the State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China,
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Gao SB, Xu B, Ding LH, Zheng QL, Zhang L, Zheng QF, Li SH, Feng ZJ, Wei J, Yin ZY, Hua X, Jin GH. The functional and mechanistic relatedness of EZH2 and menin in hepatocellular carcinoma. J Hepatol 2014; 61:832-9. [PMID: 24845612 DOI: 10.1016/j.jhep.2014.05.015] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Revised: 04/29/2014] [Accepted: 05/06/2014] [Indexed: 12/17/2022]
Abstract
BACKGROUND & AIMS The alterations of histone modification may serve as a promising diagnostic biomarker of hepatocellular carcinoma (HCC), but the clinical and mechanistic relatedness of the histone H3 lysine 27 and 4 trimethylation (H3K27me3 and H3K4me3) in HCC remains poorly understood. Here we propose that the combination of H3K27me3 and H3K4me3 is a more precise predictive/prognostic value for outcome of HCC patients. METHODS We used chromatin immunoprecipitation (ChIP) assays and a ChIP-on-chip screen to analyse HCC. RESULTS We found that the EZH2 occupancy coincides with the H3K27me3 at promoters and directly silences the transcription of target genes in HCC. The H3K27me3-related gene network of EZH2 contains well-established genes, such as CDKN2A, as well as previously unappreciated genes, including FOXO3, E2F1, and NOTCH2, among others. We further observed independently increasing profiles of H3K27me3 and H3K4me3 at the promoters of certain target genes in HCC specimens. Importantly, Kaplan-Meier analysis reveals that 3-year overall and tumour-free survival rates are dramatically reduced in patients that simultaneously express EZH2 and menin, compared to rates in the EZH2 or menin under expressing patients. Furthermore, an inhibitor of H3K27me3 alone, or in combination with an H3K4me3 inhibitor, effectively blocked the aggressive phenotype of HCC cells. CONCLUSIONS Our results indicate that a combined analysis of both H3K27me3 and H3K4me3 may serve as powerful diagnostic biomarkers of HCC, and targeting both might benefit anti-HCC therapy.
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Affiliation(s)
- Shu-Bin Gao
- Department of Basic Medical Sciences, Medical College, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China; Fujian Provincial Key Laboratory of Chronic Liver Disease and Hepatocellular Carcinoma, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China; State Key Laboratory of Cellular Stress Biology, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China
| | - Bin Xu
- Department of Basic Medical Sciences, Medical College, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China; Fujian Provincial Key Laboratory of Chronic Liver Disease and Hepatocellular Carcinoma, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China
| | - Li-Hong Ding
- Department of Basic Medical Sciences, Medical College, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China
| | - Qi-Lin Zheng
- Department of Basic Medical Sciences, Medical College, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China
| | - Li Zhang
- Department of Basic Medical Sciences, Medical College, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China; Fujian Provincial Key Laboratory of Chronic Liver Disease and Hepatocellular Carcinoma, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China
| | - Qi-Fan Zheng
- Department of Basic Medical Sciences, Medical College, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China; Fujian Provincial Key Laboratory of Chronic Liver Disease and Hepatocellular Carcinoma, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China; State Key Laboratory of Cellular Stress Biology, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China
| | - Shan-Hua Li
- Department of Basic Medical Sciences, Medical College, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China; Fujian Provincial Key Laboratory of Chronic Liver Disease and Hepatocellular Carcinoma, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China
| | - Zi-Jie Feng
- Department of Basic Medical Sciences, Medical College, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China
| | - Jie Wei
- Department of Basic Medical Sciences, Medical College, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China; Fujian Provincial Key Laboratory of Chronic Liver Disease and Hepatocellular Carcinoma, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China
| | - Zhen-Yu Yin
- Fujian Provincial Key Laboratory of Chronic Liver Disease and Hepatocellular Carcinoma, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China; Department of Hepatobiliary Surgery, Affiliated Zhongshan Hospital of Xiamen University, Hubin South Road 201-209, 361004, PR China
| | - Xianxin Hua
- Department of Cancer Biology, University of Pennsylvania, BRBII/III, Room 412, 421 Curie Blvd, Philadelphia, PA 19096, USA
| | - Guang-Hui Jin
- Department of Basic Medical Sciences, Medical College, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China; Fujian Provincial Key Laboratory of Chronic Liver Disease and Hepatocellular Carcinoma, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China; State Key Laboratory of Cellular Stress Biology, Xiamen University, Chengzhi Building 110, Xiang'an South Road, Xiamen 361102, PR China.
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Hyun SW, Jung YS. Hypoxia induces FoxO3a-mediated dysfunction of blood-brain barrier. Biochem Biophys Res Commun 2014; 450:1638-42. [PMID: 25044111 DOI: 10.1016/j.bbrc.2014.07.055] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Accepted: 07/11/2014] [Indexed: 11/19/2022]
Abstract
The Forkhead box O 3a (FoxO3a), a transcription factor, is known to be involve in change of endothelial permeability. During hypoxia, blood-brain barrier (BBB) permeability is increased through degradation of vascular endothelium cadherin (VE-cadherin) and clsudin-5. The hypoxia also increased mRNA levels of matrix metalloproteinase (MMP)-3/9 and promoted translocation of FoxO3a into nucleus in endothelial cells. However, little is known about the role of FoxO3a in hypoxia-induced BBB hyperpermeability. Here, we examined whether FoxO3a regulates hypoxia-induced BBB permeability through induction of MMPs. The transfection of siFoxO3a suppressed hypoxia-induced BBB hyperpermeability. The transfection of siFoxO3a also inhibited hypoxia-induced degradation of VE-cadherin and claudin-5. In addition, the transfection of siFoxO3a reduced hypoxia-induced increase of MMP-3 mRNA levels. However, transfection of siFoxO3a did not inhibits transcription of MMP-9 induced by hypoxia. Taken together, our findings suggest that FoxO3a is involved in hypoxia-induced degradation of VE-cadherin and claudin-5 through induction of MMPs indirectly.
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Affiliation(s)
- Soo-Wang Hyun
- College of Pharmacy, Ajou University, Suwon 443-749, Republic of Korea; Graduate Program of Molecular Medicine, Ajou University School of Medicine, Suwon 443-749, Republic of Korea
| | - Yi-Sook Jung
- College of Pharmacy, Ajou University, Suwon 443-749, Republic of Korea; Research Institute of Pharmaceutical Sciences and Technology, Ajou University, Suwon 443-749, Republic of Korea.
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FOXO transcription factors: their clinical significance and regulation. BIOMED RESEARCH INTERNATIONAL 2014; 2014:925350. [PMID: 24864265 PMCID: PMC4016844 DOI: 10.1155/2014/925350] [Citation(s) in RCA: 190] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Accepted: 01/17/2014] [Indexed: 11/17/2022]
Abstract
Members of the class O of forkhead box transcription factors (FOXO) have important roles in metabolism, cellular proliferation, stress resistance, and apoptosis. The activity of FOXOs is tightly regulated by posttranslational modification, including phosphorylation, acetylation, and ubiquitylation. Activation of cell survival pathways such as phosphoinositide-3-kinase/AKT/IKK or RAS/mitogen-activated protein kinase phosphorylates FOXOs at different sites which regulate FOXOs nuclear localization or degradation. FOXO transcription factors are upregulated in a number of cell types including hepatocytes, fibroblasts, osteoblasts, keratinocytes, endothelial cells, pericytes, and cardiac myocytes. They are involved in a number of pathologic and physiologic processes that include proliferation, apoptosis, autophagy, metabolism, inflammation, cytokine expression, immunity, differentiation, and resistance to oxidative stress. These processes impact a number of clinical conditions such as carcinogenesis, diabetes, diabetic complications, cardiovascular disease, host response, and wound healing. In this paper, we focus on the potential role of FOXOs in different disease models and the regulation of FOXOs by various stimuli.
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Wu JC, Tsai ML, Lai CS, Wang YJ, Ho CT, Pan MH. Chemopreventative effects of tetrahydrocurcumin on human diseases. Food Funct 2014; 5:12-7. [DOI: 10.1039/c3fo60370a] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Vikhreva PN, Shepelev MV, Korobko IV. mTOR-dependent transcriptional repression of Pdcd4 tumor suppressor in lung cancer cells. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2013; 1839:43-9. [PMID: 24334141 DOI: 10.1016/j.bbagrm.2013.12.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Revised: 11/19/2013] [Accepted: 12/09/2013] [Indexed: 12/25/2022]
Abstract
Programmed cell death 4 (Pdcd4) tumor suppressor is frequently lost in tumors of various origins including lung cancer, and its loss contributes to tumor progression. However molecular mechanisms underlying Pdcd4 suppression in lung cancer cells remain largely unexplored. Here we investigated molecular mechanisms of Pdcd4 suppression in lung cancer cells. Besides enhanced mTOR-dependent proteasomal degradation of Pdcd4 protein, we found that Pdcd4 transcription is negatively regulated by mTOR signaling, and localized cis-acting element in Pdcd4 promoter responsible for this effect. In conclusion, we described a novel molecular mechanism of Pdcd4 suppression in cancer cells consisting from mTOR signaling-dependent transcriptional repression of Pdcd4.
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Affiliation(s)
- P N Vikhreva
- Institute of Gene Biology, Russian Academy of Sciences, 34/5 Vavilov str., Moscow 119334, Russia
| | - M V Shepelev
- Institute of Gene Biology, Russian Academy of Sciences, 34/5 Vavilov str., Moscow 119334, Russia
| | - I V Korobko
- Institute of Gene Biology, Russian Academy of Sciences, 34/5 Vavilov str., Moscow 119334, Russia.
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Tonks KT, Ng Y, Miller S, Coster ACF, Samocha-Bonet D, Iseli TJ, Xu A, Patrick E, Yang JYH, Junutula JR, Modrusan Z, Kolumam G, Stöckli J, Chisholm DJ, James DE, Greenfield JR. Impaired Akt phosphorylation in insulin-resistant human muscle is accompanied by selective and heterogeneous downstream defects. Diabetologia 2013; 56:875-85. [PMID: 23344726 DOI: 10.1007/s00125-012-2811-y] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Accepted: 11/29/2012] [Indexed: 01/04/2023]
Abstract
AIMS/HYPOTHESIS Muscle insulin resistance, one of the earliest defects associated with type 2 diabetes, involves changes in the phosphoinositide 3-kinase/Akt network. The relative contribution of obesity vs insulin resistance to perturbations in this pathway is poorly understood. METHODS We used phosphospecific antibodies against targets in the Akt signalling network to study insulin action in muscle from lean, overweight/obese and type 2 diabetic individuals before and during a hyperinsulinaemic-euglycaemic clamp. RESULTS Insulin-stimulated Akt phosphorylation at Thr309 and Ser474 was highly correlated with whole-body insulin sensitivity. In contrast, impaired phosphorylation of Akt substrate of 160 kDa (AS160; also known as TBC1D4) was associated with adiposity, but not insulin sensitivity. Neither insulin sensitivity nor obesity was associated with defective insulin-dependent phosphorylation of forkhead box O (FOXO) transcription factor. In view of the resultant basal hyperinsulinaemia, we predicted that this selective response within the Akt pathway might lead to hyperactivation of those processes that were spared. Indeed, the expression of genes targeted by FOXO was downregulated in insulin-resistant individuals. CONCLUSIONS/INTERPRETATION These results highlight non-linearity in Akt signalling and suggest that: (1) the pathway from Akt to glucose transport is complex; and (2) pathways, particularly FOXO, that are not insulin-resistant, are likely to be hyperactivated in response to hyperinsulinaemia. This facet of Akt signalling may contribute to multiple features of the metabolic syndrome.
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Affiliation(s)
- K T Tonks
- Diabetes and Obesity Research Program, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, 2010 NSW, Australia
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Wei B, Dui W, Liu D, Xing Y, Yuan Z, Ji G. MST1, a key player, in enhancing fast skeletal muscle atrophy. BMC Biol 2013; 11:12. [PMID: 23374633 PMCID: PMC3606410 DOI: 10.1186/1741-7007-11-12] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Accepted: 02/01/2013] [Indexed: 02/06/2023] Open
Abstract
Background Skeletal muscle undergoes rapid atrophy upon denervation and the underlying mechanisms are complicated. FOXO3a has been implicated as a major mediator of muscle atrophy, but how its subcellular location and activity is controlled during the pathogenesis of muscle atrophy remains largely unknown. MST1 (Mammalian Sterile 20-like kinase 1) is identified as a central component of the Hippo signaling pathway. MST1 has been shown to mediate phosphorylation of FOXO3a at Ser207. Whether this MST1-FOXO signaling cascade exerts any functional consequence on cellular homeostasis remains to be investigated. Result We identified that MST1 kinase was expressed widely in skeletal muscles and was dramatically up-regulated in fast- but not slow-dominant skeletal muscles immediately following denervation. The results of our histological and biochemical studies demonstrated that deletion of MST1 significantly attenuated denervation-induced skeletal muscle wasting and decreased expression of Atrogin-1 and LC3 genes in fast-dominant skeletal muscles from three- to five-month-old adult mice. Further studies indicated that MST1, but not MST2, remarkably increased FOXO3a phosphorylation level at Ser207 and promoted its nuclear translocation in atrophic fast-dominant muscles. Conclusions We have established that MST1 kinase plays an important role in regulating denervation-induced skeletal muscle atrophy. During the early stage of muscle atrophy, the up-regulated MST1 kinase promoted progression of neurogenic atrophy in fast-dominant skeletal muscles through activation of FOXO3a transcription factors.
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Affiliation(s)
- Bin Wei
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Datun Road 15, Beijing 100101, China
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