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Yeo H, Ahn SS, Lee YH, Shin SY. Regulation of pro-opiomelanocortin (POMC) gene transcription by interleukin-31 via early growth response 1 (EGR-1) in HaCaT keratinocytes. Mol Biol Rep 2020; 47:5953-5962. [DOI: 10.1007/s11033-020-05668-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Accepted: 07/15/2020] [Indexed: 12/25/2022]
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Rius-Pérez S, Pérez S, Martí-Andrés P, Monsalve M, Sastre J. Nuclear Factor Kappa B Signaling Complexes in Acute Inflammation. Antioxid Redox Signal 2020; 33:145-165. [PMID: 31856585 DOI: 10.1089/ars.2019.7975] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Significance: Nuclear factor kappa B (NF-κB) is a master regulator of the inflammatory response and represents a key regulatory node in the complex inflammatory signaling network. In addition, selective NF-κB transcriptional activity on specific target genes occurs through the control of redox-sensitive NF-κB interactions. Recent Advances: The selective NF-κB response is mediated by redox-modulated NF-κB complexes with ribosomal protein S3 (RPS3), Pirin (PIR). cAMP response element-binding (CREB)-binding protein (CBP)/p300, peroxisome proliferator-activated receptor gamma coactivator 1 alpha (PGC-1α), activator protein-1 (AP-1), signal transducer and activator of transcription 3 (STAT3), early growth response protein 1 (EGR-1), and SP-1. NF-κB is cooperatively coactivated with AP-1, STAT3, EGR-1, and SP-1 during the inflammatory process, whereas NF-κB complexes with CBP/p300 and PGC-1α regulate the expression of antioxidant genes. PGC-1α may act as selective repressor of phospho-p65 toward interleukin-6 (IL-6) in acute inflammation. p65 and nuclear factor erythroid 2-related factor 2 (NRF2) compete for binding to coactivator CBP/p300 playing opposite roles in the regulation of inflammatory genes. S-nitrosylation or tyrosine nitration favors the recruitment of specific NF-κB subunits to κB sites. Critical Issues: NF-κB is a redox-sensitive transcription factor that forms specific signaling complexes to regulate selectively the expression of target genes in acute inflammation. Protein-protein interactions with coregulatory proteins, other transcription factors, and chromatin-remodeling proteins provide transcriptional specificity to NF-κB. Furthermore, different NF-κB subunits may form distinct redox-sensitive homo- and heterodimers with distinct affinities for κB sites. Future Directions: Further research is required to elucidate the whole NF-κB interactome to fully characterize the complex NF-κB signaling network in redox signaling, inflammation, and cancer.
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Affiliation(s)
- Sergio Rius-Pérez
- Department of Physiology, Faculty of Pharmacy, University of Valencia, Valencia, Spain
| | - Salvador Pérez
- Department of Physiology, Faculty of Pharmacy, University of Valencia, Valencia, Spain
| | - Pablo Martí-Andrés
- Department of Physiology, Faculty of Pharmacy, University of Valencia, Valencia, Spain
| | - María Monsalve
- Instituto de Investigaciones Biomédicas "Alberto Sols" (CSIC-UAM), Madrid, Spain
| | - Juan Sastre
- Department of Physiology, Faculty of Pharmacy, University of Valencia, Valencia, Spain
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Zhao J, Cheng Z, Quan X, Xie Z, Zhang L, Ding Z. Dimethyl fumarate protects cardiomyocytes against oxygen-glucose deprivation/reperfusion (OGD/R)-induced inflammatory response and damages via inhibition of Egr-1. Int Immunopharmacol 2020; 86:106733. [PMID: 32645629 DOI: 10.1016/j.intimp.2020.106733] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 06/05/2020] [Accepted: 06/21/2020] [Indexed: 02/07/2023]
Abstract
Acute myocardial infarction (AMI) is associated with high rates of morbidity and mortality. Atherosclerosis is among the leading causes of AMI. The rupture or erosion of atherosclerotic plaques can obstruct coronary arteries, thereby leading to an acute inflammatory reaction to ischemic injury and cardiomyocyte apoptosis. Dimethyl fumarate (DMF) is a fumaric acid diester which is used for the treatment of psoriasis and multiple sclerosis. DMF is most well-known for its modulatory actions on the Nrf2 and NF-κB cellular signaling pathways. In the present study, we employed an oxygen-glucose deprivation/reoxygenation (OGD/R) model of myocardial ischemia/reperfusion injury using H9c2 cardiomyocytes to assess the potential protective effects of DMF. We found that DMF significantly improved cell viability and reduced the expression of pro-inflammatory cytokines and chemokines, including IL-6, IL-8, and MCP-1. We further demonstrated an antioxidant effect of DMF via reduced production of ROS, which was mediated through NOX4 inhibition. Tissue factor and ICAM-1 play a major role in left ventricular remodeling. DMF inhibited the expression of TF and ICAM-1 induced by OGD/R, which we demonstrated to be mediated through the Egr-1 signaling pathway, as silencing of Egr-1 suppressed the expression of TF and ICAM-1. Together, these findings demonstrate a potential role for DMF in the treatment of myocardial infarction.
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Affiliation(s)
- Jian Zhao
- Department of Cardiovascular Surgery, People's Hospital of Zhengzhou University, Henan Provincial People's Hospital, Fuwai Central China Cardiovascular Hospital, Zhengzhou, Henan 450000, China
| | - Zhaoyun Cheng
- Department of Cardiovascular Surgery, People's Hospital of Zhengzhou University, Henan Provincial People's Hospital, Fuwai Central China Cardiovascular Hospital, Zhengzhou, Henan 450000, China
| | - Xiaoqiang Quan
- Department of Cardiovascular Surgery, People's Hospital of Zhengzhou University, Henan Provincial People's Hospital, Fuwai Central China Cardiovascular Hospital, Zhengzhou, Henan 450000, China.
| | - Zhouliang Xie
- Department of Cardiovascular Surgery, People's Hospital of Zhengzhou University, Henan Provincial People's Hospital, Fuwai Central China Cardiovascular Hospital, Zhengzhou, Henan 450000, China
| | - Leilei Zhang
- Department of Cardiovascular Surgery, People's Hospital of Zhengzhou University, Henan Provincial People's Hospital, Fuwai Central China Cardiovascular Hospital, Zhengzhou, Henan 450000, China
| | - Zhiwei Ding
- Department of Cardiovascular Surgery, People's Hospital of Zhengzhou University, Henan Provincial People's Hospital, Fuwai Central China Cardiovascular Hospital, Zhengzhou, Henan 450000, China
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Early growth response gene mediates in VEGF and FGF signaling as dissected by CRISPR in corpus luteum of water buffalo. Sci Rep 2020; 10:6849. [PMID: 32321973 PMCID: PMC7176634 DOI: 10.1038/s41598-020-63804-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 03/17/2020] [Indexed: 12/15/2022] Open
Abstract
The EGR family comprises of EGR 1, EGR 2, EGR 3 and EGR 4 which are involved in the transactivation of several genes. A broad range of extracellular stimuli by growth factors is capable of activating EGR mediated transactivation of genes involved in angiogenesis and cell proliferation. However, their role in controlling VEGF A and FGF 2 signaling in the CL of water buffalo is not known. The present study was conducted to understand the role of EGR mediated regulation of VEGF A and FGF 2 signaling in buffalo luteal cells. Towards this goal, luteal cells were cultured and treated with VEGF A and FGF 2 and the mRNA expression pattern of EGR family members were documented. The EGR 1 message was found to be up-regulated in luteal cells of buffalo at 72 hours of culture. The functional validation of EGR 1 gene was accomplished by knocking out (KO) of EGR 1 in cultured luteal cells by CRISPR/Cas9 mediated gene editing technology. The EGR 1 KO cells were then cultured and stimulated with VEGF A and FGF 2. It was observed that VEGF A and FGF 2 induced angiogenesis, cell proliferation and steroidogenesis in wild type luteal cells, whereas the response of the growth factors was attenuated in the EGR 1 KO cells. Taken together our study provides evidence convincingly that both VEGF and FGF mediate their biological action through a common intermediate, EGR 1, to regulate corpus luteum function of buffalo.
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Du J, Lv W, Yang S, Liu J, Zhen J, Leng J. Glatiramer acetate protects against oxygen-glucose deprivation/reperfusion-induced injury by inhibiting Egr-1 in H9c2 cells. Mol Immunol 2020; 120:61-66. [PMID: 32078859 DOI: 10.1016/j.molimm.2020.02.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 01/28/2020] [Accepted: 02/06/2020] [Indexed: 01/21/2023]
Abstract
Myocardial infarction (MI) or heart attack is a deadly event with high prevalence. In the present study, we investigated the effects of the polypeptide copolymer glatiramer acetate (GA) in H9c2 rat cardiomyocytes exposed to oxygen-glucose deprivation/reperfusion injury. Immediately following MI, an acute inflammatory response is triggered that causes activation of various proinflammatory cytokines, infiltration of immune cells, and neovascularization. This response is largely mediated by some genes such as TNF-α, IL-6, ICAM-1, and VEGF. Additionally, the rapid influx of oxidants, such as reactive oxygen species (ROS), leads to a harmful state of oxidative stress. Here, we found that GA could reduce OGD/R-induced inflammation and oxidative stress by inhibiting the expression of TNF-α, IL-6, ICAM-1, and VEGF, and suppressing the production of ROS via reduced NADPH oxidase 1 (NOX1) expression. To elucidate the pathways involved in these promising results, we took a close look at the impact of the endothelial growth response-1 (Egr-1), a transcriptional factor recognized as a mediator of MI-related inflammation and cellular injury. Using siRNA for Egr-1, we found that GA could reduce the expression of ICAM-1 and VEGF by inhibiting Egr-1 expression. Together, our findings indicate a novel therapeutic potential of GA in the treatment of MI.
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Affiliation(s)
- Jian Du
- Cadre' Ward, the First Hospital of Jilin University, China
| | - Wei Lv
- Cadre' Ward, the First Hospital of Jilin University, China
| | - Sitong Yang
- Cadre' Ward, the First Hospital of Jilin University, China
| | - Jia Liu
- Cadre' Ward, the First Hospital of Jilin University, China
| | - Juan Zhen
- Cadre' Ward, the First Hospital of Jilin University, China
| | - Jiyan Leng
- Cadre' Ward, the First Hospital of Jilin University, China.
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56
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Wei S, Ma X, Zhao Y. Mechanism of Hydrophobic Bile Acid-Induced Hepatocyte Injury and Drug Discovery. Front Pharmacol 2020. [PMID: 32765278 DOI: 10.3389/fphar.2020.01084/bibtex] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023] Open
Abstract
Cholestatic liver disease is caused by the obstruction of bile synthesis, transport, and excretion in or outside the liver by a variety of reasons. Long-term persistent cholestasis in the liver can trigger inflammation, necrosis, or apoptosis of hepatocytes. Bile acid nuclear receptors have received the most attention for the treatment of cholestasis, while the drug development for bile acid nuclear receptors has made considerable progress. However, the targets regulated by bile acid receptor drugs are limited. Thus, as anticipated, intervention in the expression of bile acid nuclear receptors alone will not yield satisfactory clinical results. Therefore, this review comprehensively summarized the literature related to cholestasis, analyzed the molecular mechanism that bile acid damages cells, and status of drug development. It is hoped that this review will provide some reference for the research and development of drugs for cholestasis treatment in the future.
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Affiliation(s)
- Shizhang Wei
- College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Department of Pharmacy, PLA General Hospital, Beijing, China
| | - Xiao Ma
- College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Yanling Zhao
- Department of Pharmacy, PLA General Hospital, Beijing, China
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Zhang S, Tao X, Cao Q, Feng X, Wu J, Yu H, Yu Y, Xu C, Zhao H. lnc003875/miR-363/EGR1 regulatory network in the carcinoma -associated fibroblasts controls the angiogenesis of human placental site trophoblastic tumor (PSTT). Exp Cell Res 2019; 387:111783. [PMID: 31857113 DOI: 10.1016/j.yexcr.2019.111783] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 12/13/2019] [Accepted: 12/15/2019] [Indexed: 11/26/2022]
Abstract
The rare gestational trophoblastic neoplasia placental site trophoblastic tumor (PSTT) frequently demonstrates a high degree of vascularization, which may facilitate the tumor metastasis. However, the underlying mechanisms remain largely unknown. In the present study, we found that early growth response 1 (EGR1) was highly expressed in the carcinoma-associated fibroblasts (CAFs) of PSTT tissues. Further data showed that miR-363 down-regulated EGR1 expression whereas long non-coding RNA NONHSAT003875 (lnc003875) up-regulated EGR1 expression in PSTT derived CAFs. lnc003875 exerted no effect on miR-363 expression, but it recovered the decrease of EGR1 caused by miR-363 mimic. The conditioned media from PSTT CAFs treated with miR-363 mimic abrogated the tube formation capacity of human umbilical vein endothelial cells (HUVECs), which can be partially restored by lnc003875 over-expression. Moreover, over-expression of EGR1 promoted the secretion of Angiopoietin-1 (Ang-1) in PSTT derived CAFs and improved the tube formation of HUVECs, which could be effectively abrogated by Ang-1 siRNAs. In vivo vasculogenesis assay demonstrated that lnc003875/EGR1 in PSTT derived CAFs promoted the vasculogenesis of HUVECs in C57BL/6 mice. Collectively, these findings indicated that lnc003875/miR-363/EGR1/Ang-1 in CAFs may be crucial for the angiogenesis of PSTT.
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Affiliation(s)
- Sai Zhang
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011, People's Republic of China; Department of Obstetrics and Gynecology of Shanghai Medical School, Fudan University, Shanghai, 200032, People's Republic of China; Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, 200011, People's Republic of China
| | - Xiang Tao
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011, People's Republic of China; Department of Obstetrics and Gynecology of Shanghai Medical School, Fudan University, Shanghai, 200032, People's Republic of China; Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, 200011, People's Republic of China
| | - Qi Cao
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011, People's Republic of China; Department of Obstetrics and Gynecology of Shanghai Medical School, Fudan University, Shanghai, 200032, People's Republic of China; Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, 200011, People's Republic of China
| | - Xuan Feng
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011, People's Republic of China; Department of Obstetrics and Gynecology of Shanghai Medical School, Fudan University, Shanghai, 200032, People's Republic of China; Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, 200011, People's Republic of China
| | - Jing Wu
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011, People's Republic of China; Department of Obstetrics and Gynecology of Shanghai Medical School, Fudan University, Shanghai, 200032, People's Republic of China; Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, 200011, People's Republic of China
| | - Huandi Yu
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011, People's Republic of China; Department of Obstetrics and Gynecology of Shanghai Medical School, Fudan University, Shanghai, 200032, People's Republic of China; Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, 200011, People's Republic of China
| | - Yinhua Yu
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011, People's Republic of China; Department of Obstetrics and Gynecology of Shanghai Medical School, Fudan University, Shanghai, 200032, People's Republic of China; Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, 200011, People's Republic of China
| | - Congjian Xu
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011, People's Republic of China; Department of Obstetrics and Gynecology of Shanghai Medical School, Fudan University, Shanghai, 200032, People's Republic of China; Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, 200011, People's Republic of China.
| | - Hongbo Zhao
- Obstetrics and Gynecology Hospital, Fudan University, Shanghai, 200011, People's Republic of China; Department of Obstetrics and Gynecology of Shanghai Medical School, Fudan University, Shanghai, 200032, People's Republic of China; Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Shanghai, 200011, People's Republic of China.
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58
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Billah M, Ridiandries A, Rayner BS, Allahwala UK, Dona A, Khachigian LM, Bhindi R. Egr-1 functions as a master switch regulator of remote ischemic preconditioning-induced cardioprotection. Basic Res Cardiol 2019; 115:3. [PMID: 31823016 DOI: 10.1007/s00395-019-0763-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 11/27/2019] [Indexed: 12/15/2022]
Abstract
Despite improved treatment options myocardial infarction (MI) is still a leading cause of mortality and morbidity worldwide. Remote ischemic preconditioning (RIPC) is a mechanistic process that reduces myocardial infarction size and protects against ischemia reperfusion (I/R) injury. The zinc finger transcription factor early growth response-1 (Egr-1) is integral to the biological response to I/R, as its upregulation mediates the increased expression of inflammatory and prothrombotic processes. We aimed to determine the association and/or role of Egr-1 expression with the molecular mechanisms controlling the cardioprotective effects of RIPC. This study used H9C2 cells in vitro and a rat model of cardiac ischemia reperfusion (I/R) injury. We silenced Egr-1 with DNAzyme (ED5) in vitro and in vivo, before three cycles of RIPC consisting of alternating 5 min hypoxia and normoxia in cells or hind-limb ligation and release in the rat, followed by hypoxic challenge in vitro and I/R injury in vivo. Post-procedure, ED5 administration led to a significant increase in infarct size compared to controls (65.90 ± 2.38% vs. 41.00 ± 2.83%, p < 0.0001) following administration prior to RIPC in vivo, concurrent with decreased plasma IL-6 levels (118.30 ± 4.30 pg/ml vs. 130.50 ± 1.29 pg/ml, p < 0.05), downregulation of the cardioprotective JAK-STAT pathway, and elevated myocardial endothelial dysfunction. In vitro, ED5 administration abrogated IL-6 mRNA expression in H9C2 cells subjected to RIPC (0.95 ± 0.20 vs. 6.08 ± 1.40-fold relative to the control group, p < 0.05), resulting in increase in apoptosis (4.76 ± 0.70% vs. 2.23 ± 0.34%, p < 0.05) and loss of mitochondrial membrane potential (0.57 ± 0.11% vs. 1.0 ± 0.14%-fold relative to control, p < 0.05) in recipient cells receiving preconditioned media from the DNAzyme treated donor cells. This study suggests that Egr-1 functions as a master regulator of remote preconditioning inducing a protective effect against myocardial I/R injury through IL-6-dependent JAK-STAT signaling.
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Affiliation(s)
- M Billah
- Department of Cardiology, Kolling Institute, Northern Sydney Local Health District, Level 12, Royal North Shore Hospital, Cnr Reserve Rd and Westbourne, St Leonards, NSW, 2065, Australia.
- Sydney Medical School Northern, University of Sydney, Sydney, NSW, 2006, Australia.
- School of Life Sciences, Independent University Bangladesh, Dhaka, Bangladesh.
| | - A Ridiandries
- Department of Cardiology, Kolling Institute, Northern Sydney Local Health District, Level 12, Royal North Shore Hospital, Cnr Reserve Rd and Westbourne, St Leonards, NSW, 2065, Australia
- Sydney Medical School Northern, University of Sydney, Sydney, NSW, 2006, Australia
| | - B S Rayner
- Inflammation Group, Heart Research Institute, University of Sydney, Sydney, NSW, Australia
| | - U K Allahwala
- Department of Cardiology, Kolling Institute, Northern Sydney Local Health District, Level 12, Royal North Shore Hospital, Cnr Reserve Rd and Westbourne, St Leonards, NSW, 2065, Australia
- Sydney Medical School Northern, University of Sydney, Sydney, NSW, 2006, Australia
| | - A Dona
- Department of Cardiology, Kolling Institute, Northern Sydney Local Health District, Level 12, Royal North Shore Hospital, Cnr Reserve Rd and Westbourne, St Leonards, NSW, 2065, Australia
- Sydney Medical School Northern, University of Sydney, Sydney, NSW, 2006, Australia
| | - L M Khachigian
- Vascular Biology and Translational Research, School of Medical Sciences, University of New South Wales, Sydney, Australia
| | - R Bhindi
- Department of Cardiology, Kolling Institute, Northern Sydney Local Health District, Level 12, Royal North Shore Hospital, Cnr Reserve Rd and Westbourne, St Leonards, NSW, 2065, Australia
- Sydney Medical School Northern, University of Sydney, Sydney, NSW, 2006, Australia
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Borjini N, Sivilia S, Giuliani A, Fernandez M, Giardino L, Facchinetti F, Calzà L. Potential biomarkers for neuroinflammation and neurodegeneration at short and long term after neonatal hypoxic-ischemic insult in rat. J Neuroinflammation 2019; 16:194. [PMID: 31660990 PMCID: PMC6819609 DOI: 10.1186/s12974-019-1595-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 09/23/2019] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Hypoxic-ischemic (HI) encephalopathy causes life-long morbidity and premature mortality in term neonates. Therapies in addition to whole-body cooling are under development to treat the neonate at risk for HI encephalopathy, but are not a quickly measured serum inflammatory or neuronal biomarkers to rapidly and accurately identify brain injury in order to follow the efficacy of therapies. METHODS In order to identify potential biomarkers for early inflammatory and neurodegenerative events after neonatal hypoxia-ischemia, both male and female Wistar rat pups at postnatal day 7 (P7) were used and had their right carotid artery permanently doubly occluded and exposed to 8% oxygen for 90 min. Sensory and cognitive parameters were assessed by open field, rotarod, CatWalk, and Morris water maze (MWM) test. Plasma and CSF biomarkers were investigated on the acute (24 h and 72 h) and chronic phase (4 weeks). Brains were assessed for gene expression analysis by quantitative RT-PCR Array. RESULTS We found a delay of neurological reflex maturation in HI rats. We observed anxiolytic-like baseline behavior in males more than females following HI injury. HI rats held on the rotarod for a shorter time comparing to sham. HI injury impaired spatial learning ability on MWM test. The CatWalk assessment demonstrated a long-term deficit in gait parameters related to the hind paw. Proinflammatory biomarkers such as IL-6 in plasma and CCL2 and TNF-α in CSF showed an upregulation at 24 h after HI while other cytokines, such as IL-17A and CCL5, were upregulated after 72 h in CSF. At 24 h post-injury, we observed an increase of Edn1, Hif1-α, and Mmp9 mRNA levels in the ipsilateral vs the contralateral hemisphere of HI rats. An upregulation of genes involved with clotting and hematopoietic processes was observed 72 h post-injury. CONCLUSIONS Our work showed that, in the immature brain, the HI injury induced an early increased production of several proinflammatory mediators detectable in plasma and CSF, followed by tissue damage in the hypoxic hemisphere and short-term as well as long-lasting neurobehavioral deficits.
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Affiliation(s)
- Nozha Borjini
- Corporate Pre-clinical R&D, Chiesi Farmaceutici S.p.A, Largo Belloli 11/A, 43122, Parma, Italy. .,Health Science and Technologies Interdepartmental Center for Industrial Research, University of Bologna, Via Tolara di Sopra 41/E, I-40064, Ozzano Emilia, BO, Italy. .,IRET Foundation, Via Tolara di Sopra 41/E, 40064, Ozzano Emilia, BO, Italy.
| | - Sandra Sivilia
- IRET Foundation, Via Tolara di Sopra 41/E, 40064, Ozzano Emilia, BO, Italy
| | - Alessandro Giuliani
- IRET Foundation, Via Tolara di Sopra 41/E, 40064, Ozzano Emilia, BO, Italy.,Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra 50, 40064, Ozzano Emilia, BO, Italy
| | - Mercedes Fernandez
- IRET Foundation, Via Tolara di Sopra 41/E, 40064, Ozzano Emilia, BO, Italy.,Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra 50, 40064, Ozzano Emilia, BO, Italy
| | - Luciana Giardino
- Health Science and Technologies Interdepartmental Center for Industrial Research, University of Bologna, Via Tolara di Sopra 41/E, I-40064, Ozzano Emilia, BO, Italy.,IRET Foundation, Via Tolara di Sopra 41/E, 40064, Ozzano Emilia, BO, Italy.,Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra 50, 40064, Ozzano Emilia, BO, Italy
| | - Fabrizio Facchinetti
- Corporate Pre-clinical R&D, Chiesi Farmaceutici S.p.A, Largo Belloli 11/A, 43122, Parma, Italy
| | - Laura Calzà
- Health Science and Technologies Interdepartmental Center for Industrial Research, University of Bologna, Via Tolara di Sopra 41/E, I-40064, Ozzano Emilia, BO, Italy.,IRET Foundation, Via Tolara di Sopra 41/E, 40064, Ozzano Emilia, BO, Italy.,Department of Pharmacy and Biotechnology, University of Bologna, Via Tolara di Sopra 41, 40064, Ozzano Emilia, BO, Italy
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Zhang X, Gao B, Huang Y, Zhang Y, Li Z, Zhao D, Ma B, Xue D, Zhang W. miR‑92a‑3p regulates trypsinogen activation via Egr1 in AR42J cells. Mol Med Rep 2019; 20:4140-4150. [PMID: 31545429 PMCID: PMC6797994 DOI: 10.3892/mmr.2019.10673] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Accepted: 07/15/2019] [Indexed: 12/29/2022] Open
Abstract
Acute pancreatitis (AP) exhibits high morbidity and mortality rates. The onset of AP is characterized by early trypsinogen activation. The present study aimed to investigate the expression of microRNA (miR)-92a-3p and early growth response protein 1 (Egr1), and the effect of miR-92a-3p on trypsinogen activation in the pancreatic exocrine cell line AR42J. mRNA and miRNA microarrays were used to identify differentially expressed mRNAs and miRNAs in AR42J cells. A miRNA-mRNA network was constructed using bioinformatics software, and Egr1 and its regulated miRNA subnetworks were identified by reviewing previous literature. The results suggested that miR-92a-3p could bind to Egr1 3′untranslated region sequence. Subsequently, miR-92a-3p mimic and inhibitor were used to transfect AR42J cells. Following transfection, reverse transcription-quantitative PCR and western blotting were performed to detect Egr1 expression. Furthermore, AR42J cells were cotransfected with miR-92a-3p inhibitor and small interfering (si)-Egr1. The trypsinogen activation rate of AR42J cells was measured by flow cytometry. Microarrays and bioinformatics results indicated that Egr1 may be a target gene of miR-92a-3p. In addition, the present study suggested that miR-92a-3p downregulated Egr1 in vitro and that miR-92a-3p and Egr1 expression was associated with trypsinogen activation. Furthermore, miR-92a-3p inhibitor reversed the effect of si-Egr1 on trypsinogen activation. In conclusion, miR-92a-3p may negatively regulate the activation of trypsinogen in AR42J cells via Egr1.
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Affiliation(s)
- Xueming Zhang
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Bo Gao
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Yang Huang
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Yong Zhang
- Department of Hepatopancreatobiliary Surgery, Weifang Traditional Chinese Medicine Hospital, Weifang, Shandong 261041, P.R. China
| | - Zhituo Li
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Dali Zhao
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Biao Ma
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Dongbo Xue
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Weihui Zhang
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
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Liu Y, Donovan M, Jia X, Wang Z. The ventromedial hypothalamic circuitry and male alloparental behaviour in a socially monogamous rodent species. Eur J Neurosci 2019; 50:3689-3701. [PMID: 31423669 DOI: 10.1111/ejn.14550] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 07/27/2019] [Accepted: 08/12/2019] [Indexed: 12/13/2022]
Abstract
As prairie voles (Microtus ochrogaster) display spontaneous biparental care, and the ventromedial hypothalamus (VMH) has been implicated in reproductive behaviour, we conducted experiments to test the hypothesis that the VMH neurochemical circuitry is involved in alloparental behaviours in male prairie voles. We compared alloparental behaviours of adult, sexually naïve male and female voles-both displayed licking/grooming, huddling and retrieving behaviours towards conspecific pups. We also stained for the immediate-early gene encoded early growth protein Egr-1 in the vole brain. The pup-exposed animals showed levels of Egr-1 staining that was higher in the VMH but lower in the amygdala compared to animals exposed to a pup-sized piece of plastic (control). A retrograde tracer, Fluoro-Gold (FG), was injected into the VMH of male voles that were subsequently tested in the pup exposure or control condition. More FG/Egr-1 cells were detected for glutamatergic (GLU) staining in the ventral bed nucleus of the stria terminalis (BNSTv) and medial amygdala (MeA), whereas less FG/Egr-1 cells were stained for gamma-aminobutyric acid (GABA) in the MeA of the pup-exposed group compared to the control group. Further, the ratio of GLU:GABA expression in FG/Egr-1 projection neurons from both the BNSTv and MeA to the VMH was increased following pup exposure. Finally, pharmacological blockade of either dopamine D1 receptor or oxytocin receptor in the VMH impaired the onset of male alloparental behaviour. Together, these data suggest that the VMH may be involved in the onset of alloparental care and play a role in regulating social approach in male prairie voles.
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Affiliation(s)
- Yan Liu
- Department of Psychology and Program in Neuroscience, Florida State University, Tallahassee, FL, USA
| | - Meghan Donovan
- Department of Psychology and Program in Neuroscience, Florida State University, Tallahassee, FL, USA
| | - Xixi Jia
- Department of Psychology and Program in Neuroscience, Florida State University, Tallahassee, FL, USA
| | - Zuoxin Wang
- Department of Psychology and Program in Neuroscience, Florida State University, Tallahassee, FL, USA
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Zhang HY, Liu Q, Yang HX, Shi LQ, Wang P, Xie MJ, Liu JQ, Xu XJ, Liu XD, Yu SB, Jiao K, Zhang M, Xuan SJ, Xu YF, Zhang X, Liu YF, Zhang J, Wang MQ. Early growth response 1 reduction in peripheral blood involving condylar subchondral bone loss. Oral Dis 2019; 25:1759-1768. [PMID: 31357246 DOI: 10.1111/odi.13168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 05/29/2019] [Accepted: 07/22/2019] [Indexed: 12/24/2022]
Abstract
OBJECTIVES To detect whether early growth response 1 (EGR1) in peripheral blood leucocytes (PBLs) indicates temporomandibular joint (TMJ) osteoarthritis (OA) lesions. MATERIALS AND METHODS Egr1 mRNA expression levels in PBLs were detected in eight malocclusion patients without temporomandibular disorder (TMD) signs and 16 malocclusion patients with clinical TMD signs with (eight) or without (eight) imaging signs of TMJ OA. Twelve 6-week-old rats were randomized to a control group and a unilateral anterior crossbite (UAC) group and were sampled at 4 weeks. The Egr1 mRNA expression levels in PBLs and protein expression levels in different orofacial tissues were measured. RESULTS Patients with TMD signs with/without TMJ OA diagnosis showed lower Egr1 mRNA expression levels in PBLs than patients without TMD signs. The lower Egr1 mRNA expression was also found in the PBLs of UAC rats, which were induced to exhibit early histo-morphological signs of TMJ OA lesions. In subchondral bone of UAC rats, EGR1 protein expression was decreased, co-localization of EGR1 with osterix or dentin matrix protein-1 was identified, and the number of EGR1 and osterix double-positive cells was reduced (all p < .05). CONCLUSION Egr1 reduction in PBLs potentially indicates subchondral bone OA lesions at an early stage.
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Affiliation(s)
- Hong-Yun Zhang
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Qian Liu
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Hong-Xu Yang
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Li-Qiang Shi
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi Clinical Research Center for Oral Diseases, Department of Radiology, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Pei Wang
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi Clinical Research Center for Oral Diseases, Department of Radiology, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Mian-Jiao Xie
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Jin-Qiang Liu
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Xiao-Jie Xu
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Xiao-Dong Liu
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Shi-Bin Yu
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Kai Jiao
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Mian Zhang
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Shi-Jie Xuan
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Yi-Fei Xu
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Xuan Zhang
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Yi-Fan Liu
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Jing Zhang
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Mei-Qing Wang
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi International Joint Research Center for Oral Diseases, Department of Oral Anatomy and Physiology and TMD, School of Stomatology, The Fourth Military Medical University, Xi'an, China
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63
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Insulin Treatment Forces Arteriogenesis in Diabetes Mellitus by Upregulation of the Early Growth Response-1 (Egr-1) Pathway in Mice. Int J Mol Sci 2019; 20:ijms20133320. [PMID: 31284541 PMCID: PMC6651530 DOI: 10.3390/ijms20133320] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 07/01/2019] [Accepted: 07/03/2019] [Indexed: 11/19/2022] Open
Abstract
The process of arteriogenesis is severely compromised in patients with diabetes mellitus (DM). Earlier studies have reported the importance of Egr-1 in promoting collateral outward remodeling. However, the role of Egr-1 in the presence of DM in outward vessel remodeling was not studied. We hypothesized that Egr-1 expression may be compromised in DM which may lead to impaired collateral vessel growth. Here, we investigated the relevance of the transcription factor Egr-1 for the process of collateral artery growth in diabetic mice. Induction of arteriogenesis by femoral artery ligation resulted in an increased expression of Egr-1 on mRNA and protein level but was severely compromised in streptozotocin-induced diabetic mice. Diabetes mellitus mice showed a significantly reduced expression of Egr-1 endothelial downstream genes Intercellular Adhesion Molecule-1 (ICAM-1) and urokinase Plasminogen Activator (uPA), relevant for extravasation of leukocytes which promote arteriogenesis. Fluorescent-activated cell sorting analyses confirmed reduced leukocyte recruitment. Diabetes mellitus mice showed a reduced expression of the proliferation marker Ki-67 in growing collaterals whose luminal diameters were also reduced. The Splicing Factor-1 (SF-1), which is critical for smooth muscle cell proliferation and phenotype switch, was found to be elevated in collaterals of DM mice. Treatment of DM mice with insulin normalized the expression of Egr-1 and its downstream targets and restored leukocyte recruitment. SF-1 expression and the diameter of growing collaterals were normalized by insulin treatment as well. In summary, our results showed that Egr-1 signaling was impaired in DM mice; however, it can be rescued by insulin treatment.
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64
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Rudnizky S, Khamis H, Malik O, Squires AH, Meller A, Melamed P, Kaplan A. Single-molecule DNA unzipping reveals asymmetric modulation of a transcription factor by its binding site sequence and context. Nucleic Acids Res 2019; 46:1513-1524. [PMID: 29253225 PMCID: PMC5815098 DOI: 10.1093/nar/gkx1252] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Accepted: 12/11/2017] [Indexed: 12/31/2022] Open
Abstract
Most functional transcription factor (TF) binding sites deviate from their ‘consensus’ recognition motif, although their sites and flanking sequences are often conserved across species. Here, we used single-molecule DNA unzipping with optical tweezers to study how Egr-1, a TF harboring three zinc fingers (ZF1, ZF2 and ZF3), is modulated by the sequence and context of its functional sites in the Lhb gene promoter. We find that both the core 9 bp bound to Egr-1 in each of the sites, and the base pairs flanking them, modulate the affinity and structure of the protein–DNA complex. The effect of the flanking sequences is asymmetric, with a stronger effect for the sequence flanking ZF3. Characterization of the dissociation time of Egr-1 revealed that a local, mechanical perturbation of the interactions of ZF3 destabilizes the complex more effectively than a perturbation of the ZF1 interactions. Our results reveal a novel role for ZF3 in the interaction of Egr-1 with other proteins and the DNA, providing insight on the regulation of Lhb and other genes by Egr-1. Moreover, our findings reveal the potential of small changes in DNA sequence to alter transcriptional regulation, and may shed light on the organization of regulatory elements at promoters.
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Affiliation(s)
- Sergei Rudnizky
- Faculty of Biology, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Hadeel Khamis
- Faculty of Biology, Technion-Israel Institute of Technology, Haifa 32000, Israel.,Faculty of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Omri Malik
- Faculty of Biology, Technion-Israel Institute of Technology, Haifa 32000, Israel.,Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Allison H Squires
- Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA
| | - Amit Meller
- Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel.,Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA.,Faculty of Biomedical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Philippa Melamed
- Faculty of Biology, Technion-Israel Institute of Technology, Haifa 32000, Israel.,Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Ariel Kaplan
- Faculty of Biology, Technion-Israel Institute of Technology, Haifa 32000, Israel.,Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel
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65
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Mahmood N, Rabbani SA. DNA Methylation Readers and Cancer: Mechanistic and Therapeutic Applications. Front Oncol 2019; 9:489. [PMID: 31245293 PMCID: PMC6579900 DOI: 10.3389/fonc.2019.00489] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 05/23/2019] [Indexed: 12/14/2022] Open
Abstract
DNA methylation is a major epigenetic process that regulates chromatin structure which causes transcriptional activation or repression of genes in a context-dependent manner. In general, DNA methylation takes place when methyl groups are added to the appropriate bases on the genome by the action of "writer" molecules known as DNA methyltransferases. How these methylation marks are read and interpreted into different functionalities represents one of the main mechanisms through which the genes are switched "ON" or "OFF" and typically involves different types of "reader" proteins that can recognize and bind to the methylated regions. A tightly balanced regulation exists between the "writers" and "readers" in order to mediate normal cellular functions. However, alterations in normal methylation pattern is a typical hallmark of cancer which alters the way methylation marks are written, read and interpreted in different disease states. This unique characteristic of DNA methylation "readers" has identified them as attractive therapeutic targets. In this review, we describe the current state of knowledge on the different classes of DNA methylation "readers" identified thus far along with their normal biological functions, describe how they are dysregulated in cancer, and discuss the various anti-cancer therapies that are currently being developed and evaluated for targeting these proteins.
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Affiliation(s)
- Niaz Mahmood
- Department of Medicine, McGill University Health Centre, Montréal, QC, Canada
| | - Shafaat A Rabbani
- Department of Medicine, McGill University Health Centre, Montréal, QC, Canada
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66
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Yu S, Zhou R, Yang T, Liu S, Cui Z, Qiao Q, Zhang J. Hypoxia promotes colorectal cancer cell migration and invasion in a SIRT1-dependent manner. Cancer Cell Int 2019; 19:116. [PMID: 31068761 PMCID: PMC6492435 DOI: 10.1186/s12935-019-0819-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 04/08/2019] [Indexed: 12/19/2022] Open
Abstract
Background Hypoxic microenvironments play a significant role in the progression of colorectal cancer (CRC). Silencing information regulator 1 (SIRT1), a class III histone deacetylase, modulates the multiple biological behaviors of cancer. However, its role in CRC remains unclear. This study aims to explore the role of SIRT1 in CRC migration and invasion under hypoxia. Methods SIRT1 protein and mRNA levels were detected by Western blotting and real-time PCR in CRC cells exposed to hypoxia (1% O2). The migration and invasion abilities of SW480 and HCT116 cells with SIRT1 overexpression or knockdown were studied with transwell assays, and the results were confirmed by those of treatment with specific SIRT1 activator (SRT1720) and inhibitor (EX527). The dual-luciferase reporter systems with a series of SIRT1 promoter truncations were used to analyze their transcriptional activities, respectively. After a bioinformatic analysis of potential transcription factors, the direct interaction between the transcription factor and SIRT1 promoter was determined by chromatin immunoprecipitation (ChIP) assays. Western blot and real-time PCR assays were used to detect the activation and acetylation levels of the NF-κB pathway. Results The protein and mRNA levels of SIRT1 were significantly decreased under hypoxia, and these effects were replicated by cobalt chloride treatment. Hypoxia promoted cell migration and invasion, which were impeded by the overexpression or activation of SIRT1 and promoted by the knockdown or inhibition of SIRT1. The dual-luciferase reporter gene and ChIP analyses revealed that the core regulatory elements located 100 bp upstream of the SIRT1 promoter and early growth response factor 1 (EGR1) could interact with this DNA sequence. Subsequent rescue experiments suggested that EGR1 was essential for hypoxia-mediated SIRT1 transcriptional suppression. Western blot analyses demonstrated that SIRT1 overexpression eliminated the p65 acetylation induced by hypoxia along with the decreased MMP-2/-9, suggesting that NF-κB was a direct downstream target of SIRT1 and might regulate cell migration and invasion through MMP-2/-9. Conclusions Our results establish for the first time that EGR1 plays an important role in regulating SIRT1 expression under hypoxia. Hypoxia promotes CRC cell migration and invasion in a SIRT1-dependent manner. And a potential SIRT1/NF-κB/MMP-2/-9 axis modulates this process. Electronic supplementary material The online version of this article (10.1186/s12935-019-0819-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Shentong Yu
- 1State Key Laboratory of Cancer Biology, Department of Pathology, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032 China
| | - Ru Zhou
- 1State Key Laboratory of Cancer Biology, Department of Pathology, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032 China
| | - Tong Yang
- 1State Key Laboratory of Cancer Biology, Department of Pathology, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032 China
| | - Shuang Liu
- 2School of Basic Medicine, The Fourth Military Medical University, Xi'an, 710032 China
| | - Zhuqing Cui
- 1State Key Laboratory of Cancer Biology, Department of Pathology, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032 China
| | - Qing Qiao
- 3Department of General Surgery, Tangdu Hospital, The Fourth Military Medical University, Xi'an, 710038 Shaanxi China
| | - Jing Zhang
- 1State Key Laboratory of Cancer Biology, Department of Pathology, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032 China
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67
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Gene expression analysis of follicular cells revealed inflammation as a potential IVF failure cause. J Assist Reprod Genet 2019; 36:1195-1210. [PMID: 31001707 DOI: 10.1007/s10815-019-01447-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 03/29/2019] [Indexed: 01/13/2023] Open
Abstract
PURPOSE Hormonal stimulation prior to IVF influences the ovarian environment and therefore impacts oocytes and subsequent embryo quality. Not every patient has the same response to the same treatment and many fail for unknown reasons. Knowing why a cycle has failed and how the follicles were affected would allow clinicians to adapt the treatment accordingly and improve success rate. This study examines the hypothesis that transcriptomic analysis of follicular cells from failed IVF cycles reveals potential reasons for failure and provides new information on the physiological mechanisms related to IVF failure. METHODS Follicular cells (granulosa cells) were obtained from IVF patients of four Canadian fertility clinics. Using microarray analysis, patients that did not become pregnant following the IVF cycle were compared to those that did. Functional analysis was performed using ingenuity pathway analysis and qRT-PCR was used to validate the microarray results in a larger cohort of patients. RESULTS The microarray showed 165 differentially expressed genes (DEGs) in the negative group compared to the pregnancy group. DEGs include many pro-inflammatory cytokines and other factors related to inflammation, suggesting that this process might be altered when IVF fails. Overexpression of several factors, some of which act upstream from vascular endothelial growth factor (VEGF), also indicates increased permeability and vasodilation. Some DEGs were related to abnormal differentiation and increased apoptosis. CONCLUSIONS Our results suggest that failure to conceive following IVF cycles could be associated with an imbalance between pro-inflammatory and anti-inflammatory mediators. The findings of this study identify potential failure causes and pathways for further investigation. Stimulatory protocols personalized according to patient response could improve the chances of later success.
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68
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FTY720 Effects on Inflammation and Liver Damage in a Rat Model of Renal Ischemia-Reperfusion Injury. Mediators Inflamm 2019; 2019:3496836. [PMID: 31015795 PMCID: PMC6446098 DOI: 10.1155/2019/3496836] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 10/01/2018] [Accepted: 11/06/2018] [Indexed: 02/06/2023] Open
Abstract
Objective Ischemia-reperfusion injury (IRI) produces systemic inflammation with the potential for causing organ failure in tissues peripheral to the initial site of injury. We speculate that treatment strategies that dampen inflammation may be therapeutically beneficial to either the initial site of injury or peripheral organs. To test this, we evaluated the impact of FTY720-induced sequestration of circulating mature lymphocytes on renal IRI and secondary organ injury. Methods A microvascular clamp was surgically placed around the left renal pedicle of anesthetized male Sprague-Dawley rats with either vehicle or FTY720 treatment (0.3 mg/kg) intravenously injected after 15 min of ischemia. Blood flow was restored after 60 min. Cohorts of anesthetized rats were euthanized at 6, 24, or 72 hrs with tissue samples collected for analysis. Results FTY720 treatment resulted in profound T lymphocyte reduction in peripheral blood. Histopathologic examination, clinical chemistries, and gene transcript expression measurements revealed that FTY720 treatment reduced hepatocellular degeneration, reduced serum markers of liver injury (ALT/AST), and reduced the expression of gene targets associated with IRI. Conclusion These findings support an anti-inflammatory effect of FTY720 in the liver where the expression of genes associated with apoptosis, chemotaxis, and the AP-1 transcription factor was reduced. Findings presented here provide the basis for future studies evaluating FTY720 as a potential therapeutic agent to treat complications resulting from renal IRI.
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69
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Zhang Z, Jin X, Yang C, Li Y. Teneligliptin protects against hypoxia/reoxygenation-induced endothelial cell injury. Biomed Pharmacother 2019; 109:468-474. [DOI: 10.1016/j.biopha.2018.10.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 09/27/2018] [Accepted: 10/03/2018] [Indexed: 01/15/2023] Open
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70
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Richardson RJ. Parallels between vertebrate cardiac and cutaneous wound healing and regeneration. NPJ Regen Med 2018; 3:21. [PMID: 30416753 PMCID: PMC6220283 DOI: 10.1038/s41536-018-0059-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 10/12/2018] [Indexed: 12/11/2022] Open
Abstract
The cellular events that contribute to tissue healing of non-sterile wounds to the skin and ischaemic injury to internal organs such as the heart share remarkable similarities despite the differences between these injury types and organs. In adult vertebrates, both injuries are characterised by a complex series of overlapping events involving multiple different cell types and cellular interactions. In adult mammals both tissue-healing processes ultimately lead to the permanent formation of a fibrotic, collagenous scar, which can have varying effects on tissue function depending on the site and magnitude of damage. Extensive scarring in the heart as a result of a severe myocardial infarction contributes to ventricular dysfunction and the progression of heart failure. Some vertebrates such as adult zebrafish, however, retain a more embryonic capacity for scar-free tissue regeneration in many tissues including the skin and heart. In this review, the similarities and differences between these different types of wound healing are discussed, with special attention on recent advances in regenerative, non-scarring vertebrate models such as the zebrafish.
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Affiliation(s)
- Rebecca J Richardson
- School of Physiology, Pharmacology and Neuroscience, Faculty of Biomedical Sciences, University of Bristol, Bristol, UK
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71
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Rosa P, Zerbinati C, Crestini A, Canudas AM, Ragona G, Confaloni A, Iuliano L, Calogero A. Heme Oxygenase-1 and Brain Oxysterols Metabolism Are Linked to Egr-1 Expression in Aged Mice Cortex, but Not in Hippocampus. Front Aging Neurosci 2018; 10:363. [PMID: 30459596 PMCID: PMC6232516 DOI: 10.3389/fnagi.2018.00363] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 10/23/2018] [Indexed: 01/19/2023] Open
Abstract
Throughout life, stress stimuli act upon the brain leading to morphological and functional changes in advanced age, when it is likely to develop neurodegenerative disorders. There is an increasing need to unveil the molecular mechanisms underlying aging, in a world where populations are getting older. Egr-1 (early growth response 1), a transcriptional factor involved in cell survival, proliferation and differentiation – with a role also in memory, cognition and synaptic plasticity, can be implicated in the molecular mechanism of the aging process. Moreover, Heme Oxygenase-1a (HO), a 32 kDa heat-shock protein that converts heme to iron, carbon monoxide and biliverdin, is a key enzyme with neuroprotective properties. Several in vitro and in vivo studies reported that HO-1 could regulate the metabolism of oxysterols, oxidation products of cholesterol that include markers of oxidative stress. Recently, a link between Egr-1 and HO-1 has been demonstrated in mouse lung cells exposed to cigarette smoke. In view of these data, we wanted to investigate whether Egr-1 can be implicated also in the oxysterol metabolism during brain aging. Our results show that Egr-1 expression is differently expressed in the cortex and hippocampus of old mice, as well as the oxysterol profile between these two brain areas. In particular, we show that the cortex experiences in an age-dependent fashion increasing levels of the Egr-1 protein, and that these correlate with the level of HO-1 expression and oxysterol abundance. Such a situation was not observed in the hippocampus. These results are further strenghtened by our observations made with Egr-1 KO mice, confirming our hypothesis concerning the influence of Egr-1 on oxysterol production and accumulation via regulation of the expression of HO-1 in the cortex, but not the hippocampus, of old mice. It is important to notice that most of the oxysterols involved in this process are those usually stimulated by oxidative stress, which would then represent the triggering factor for this mechanism.
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Affiliation(s)
- Paolo Rosa
- Department of Medical-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Polo Pontino, Latina, Italy
| | - Chiara Zerbinati
- Department of Medical-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Polo Pontino, Latina, Italy.,Istituto Chirurgico Ortopedico Traumatologico, ICOT, Latina, Italy
| | - Alessio Crestini
- Department of Neuroscience, Istituto Superiore di Sanità, Rome, Italy
| | - Anna-Maria Canudas
- Department of Pharmacology, Toxicology and Therapeutic Chemistry (Pharmacology Section), Institute of Neuroscience, CIBERNED, University of Barcelona, Barcelona, Spain
| | - Giuseppe Ragona
- Department of Medical-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Polo Pontino, Latina, Italy.,Istituto Chirurgico Ortopedico Traumatologico, ICOT, Latina, Italy
| | | | - Luigi Iuliano
- Department of Medical-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Polo Pontino, Latina, Italy.,Istituto Chirurgico Ortopedico Traumatologico, ICOT, Latina, Italy
| | - Antonella Calogero
- Department of Medical-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Polo Pontino, Latina, Italy.,Istituto Chirurgico Ortopedico Traumatologico, ICOT, Latina, Italy
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Hudson NO, Buck-Koehntop BA. Zinc Finger Readers of Methylated DNA. Molecules 2018; 23:E2555. [PMID: 30301273 PMCID: PMC6222495 DOI: 10.3390/molecules23102555] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 10/03/2018] [Accepted: 10/05/2018] [Indexed: 01/07/2023] Open
Abstract
DNA methylation is a prevalent epigenetic modification involved in regulating a number of essential cellular processes, including genomic accessibility and transcriptional outcomes. As such, aberrant alterations in global DNA methylation patterns have been associated with a growing number of disease conditions. Nevertheless, the full mechanisms by which DNA methylation information is interpreted and translated into genomic responses is not yet fully understood. Methyl-CpG binding proteins (MBPs) function as important mediators of this essential process by selectively reading DNA methylation signals and translating this information into down-stream cellular outcomes. The Cys₂His₂ zinc finger scaffold is one of the most abundant DNA binding motifs found within human transcription factors, yet only a few zinc finger containing proteins capable of conferring selectivity for mCpG over CpG sites have been characterized. This review summarizes our current structural understanding for the mechanisms by which the zinc finger MBPs evaluated to date read this essential epigenetic mark. Further, some of the biological implications for mCpG readout elicited by this family of MBPs are discussed.
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Affiliation(s)
- Nicholas O Hudson
- Department of Chemistry, University of Utah, Salt Lake City, UT 84112-0850, USA.
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73
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Klenke S, Engler A, Ecker D, Ochsenfarth C, Danowski N, Peters J, Siffert W, Frey UH. The GRK2
Promoter Is Regulated by Early-Growth Response Transcription Factor EGR-1. Basic Clin Pharmacol Toxicol 2018; 123:660-669. [DOI: 10.1111/bcpt.13055] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 06/11/2018] [Indexed: 01/25/2023]
Affiliation(s)
- Stefanie Klenke
- Department of Anaesthesia and Intensive Care Medicine; University of Duisburg-Essen and Essen University Hospital; Essen Germany
| | - Andrea Engler
- Department of Anaesthesia and Intensive Care Medicine; University of Duisburg-Essen and Essen University Hospital; Essen Germany
| | - Daniel Ecker
- Department of Anaesthesia and Intensive Care Medicine; University of Duisburg-Essen and Essen University Hospital; Essen Germany
| | - Crista Ochsenfarth
- Department of Anaesthesia and Intensive Care Medicine; University of Duisburg-Essen and Essen University Hospital; Essen Germany
- Department of Anaesthesia, Intensive Care, Pain and Palliative Medicine; Marien Hospital Herne; Ruhr-University Bochum; Bochum Germany
| | - Nina Danowski
- Institute of Pharmacogenetics; University of Duisburg-Essen and Essen University Hospital; Essen Germany
| | - Jürgen Peters
- Department of Anaesthesia and Intensive Care Medicine; University of Duisburg-Essen and Essen University Hospital; Essen Germany
| | - Winfried Siffert
- Institute of Pharmacogenetics; University of Duisburg-Essen and Essen University Hospital; Essen Germany
| | - Ulrich H. Frey
- Department of Anaesthesia and Intensive Care Medicine; University of Duisburg-Essen and Essen University Hospital; Essen Germany
- Department of Anaesthesia, Intensive Care, Pain and Palliative Medicine; Marien Hospital Herne; Ruhr-University Bochum; Bochum Germany
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74
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Ebeling M, Lüdemann W, Frisius J, Karst M, Schedel I, Gerganov V, Samii A, Fahlbusch R. Venous thromboembolic complications with and without intermittent intraoperative and postoperative pneumatic compression in patients with glioblastoma multiforme using intraoperative magnetic resonance imaging. A retrospective study. Neurochirurgie 2018; 64:161-165. [PMID: 29859696 DOI: 10.1016/j.neuchi.2018.04.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Revised: 02/14/2018] [Accepted: 04/13/2018] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To evaluate the effectiveness of intraoperative and postoperative intermittent pneumatic compression (IPC) as a method used to decrease the incidence of deep venous thrombosis (DVT), in comparison to the standard use of graduated compression stockings, low-molecular weight heparin (LMWH) and physiotherapy during the hospital stay. All patients in this study underwent intracranial surgery for glioblastoma multiforme (GBM) using intraoperative magnetic resonance imaging (MRI) guidance. PATIENTS AND METHODS We performed a single center retrospective study of a cohort of 153 patients who underwent surgery for GBM aided by intraoperative MRI from October of 2009 to January of 2015 at the International Neuroscience Institute (INI), Hannover, Germany. Out of all patients, 75 in comparison to 78 were operated with and without the additional use of IPC, respectively. Both groups received graduated compression stockings, LMWH and physiotherapy postoperatively as a basic thromboprophylaxis. Postoperatively the patients were screened for DVT by Doppler ultrasonography of the limbs and pulmonary embolism (PE) by CT-scan of the chest. RESULTS DVTs were found in 6 patients with IPC and in 3 patients without IPC. The incidence of developing DVTs was therefore not significantly increased with the application of IPC from 3.9% to 8% (P-value: 0.33). No statistically significant differences were found in the probability of occurrence of pulmonary embolism (PE) with a reduction from 2.6% to 1.3% (P-value: 0.59). CONCLUSION Our results demonstrate, that the surgical intervention and the subsequent patient immobilization, as well as the thromboprophylactic techniques used have a relatively low influence on the occurrence of thromboembolic complications than we expected. Our findings might be attributed to the overall low number of these complications in a glioblastoma multiforme patient population expected to be at a high risk for coagulopathy. In other words, in order to produce statistically significant results, we would need to increase the patient cohort. By doing so we may better detect a positive therapeutic effect. Alternatively, because of the multitude of possible complex risk-factors leading to coagulopathy in a glioblastoma patient population it might be the case that IPC has little or no effect and that there is a different underlying mechanism responsible for the observed coagulopathy.
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Affiliation(s)
- M Ebeling
- Hanover Medical School, Hanover, Carl-Neuberg-Straße 1, 30625 Hanover, Germany.
| | - W Lüdemann
- Department of Neurosurgery, Helios Klinik, Hildesheim, Senator-Braun-Allee 33, 31135 Hildesheim, Germany.
| | - J Frisius
- Department of Anesthesiology, International Neuroscience Institute, Hanover, Rudolf-Pichlmayr-Straße 4, 30625 Hanover, Germany
| | - M Karst
- Department of Anesthesiology, Hanover Medical School, Hanover, Carl-Neuberg-Straße 1, 30625 Hanover, Germany.
| | - I Schedel
- Department of Internal Medicine, Hanover Medical School, Hanover, Germany, Carl-Neuberg-Straße 1, 30625 Hanover, Germany
| | - V Gerganov
- Department of Neurosurgery, International Neuroscience Institute, Hanover, Rudolf-Pichlmayr-Straße 4, 30625 Hanover, Germany
| | - A Samii
- Department of Neurosurgery, International Neuroscience Institute, Hanover, Rudolf-Pichlmayr-Straße 4, 30625 Hanover, Germany
| | - R Fahlbusch
- Department of Neurosurgery, International Neuroscience Institute, Hanover, Rudolf-Pichlmayr-Straße 4, 30625 Hanover, Germany
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75
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Giraud S, Steichen C, Allain G, Couturier P, Labourdette D, Lamarre S, Ameteau V, Tillet S, Hannaert P, Thuillier R, Hauet T. Dynamic transcriptomic analysis of Ischemic Injury in a Porcine Pre-Clinical Model mimicking Donors Deceased after Circulatory Death. Sci Rep 2018; 8:5986. [PMID: 29654283 PMCID: PMC5899088 DOI: 10.1038/s41598-018-24282-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 03/28/2018] [Indexed: 02/06/2023] Open
Abstract
Due to organ shortage, clinicians are prone to consider alternative type of organ donors among them donors deceased after circulatory death (DCD). However, especially using these organs which are more prone to graft dysfunction, there is a need to better understand mechanistic events ocuring during ischemia phase and leading to ischemia/reperfusion injuries (IRI). The aim of this study is to provide a dynamic transcriptomic analysis of preclinical porcine model kidneys subjected to ischemic stress mimicking DCD donor. We compared cortex and corticomedullary junction (CMJ) tissues from porcine kidneys submitted to 60 min warm ischemia (WI) followed by 0, 6 or 24 hours of cold storage in University of Wisconsin solution versus control non-ischemic kidneys (n = 5 per group). 29 cortex genes and 113 CMJ genes were significantly up or down-regulated after WI versus healthy kidneys, and up to 400 genes were regulated after WI followed by 6 or 24 hours of cold storage (p < 0.05). Functionnal enrichment analysis (home selected gene kinetic classification, Gene-ontology-biological processes and Gene-ontology-molecular-function) revealed relevant genes implication during WI and cold storage. We uncovered targets which we will further validate as biomarkers and new therapeutic targets to optimize graft kidney quality before transplantation and improve whole transplantation outcome.
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Affiliation(s)
- Sebastien Giraud
- Inserm U1082 IRTOMIT, Poitiers, F-86000, France.,Université de Poitiers, Faculté de Médecine et de Pharmacie, Poitiers, F-86000, France.,CHU Poitiers, Service de Biochimie, Poitiers, F-86000, France
| | - Clara Steichen
- Inserm U1082 IRTOMIT, Poitiers, F-86000, France.,Université de Poitiers, Faculté de Médecine et de Pharmacie, Poitiers, F-86000, France
| | - Geraldine Allain
- Inserm U1082 IRTOMIT, Poitiers, F-86000, France.,Université de Poitiers, Faculté de Médecine et de Pharmacie, Poitiers, F-86000, France.,CHU Poitiers, Service de chirurgie cardio-thoracique, Poitiers, 86000, France
| | - Pierre Couturier
- Inserm U1082 IRTOMIT, Poitiers, F-86000, France.,CHU Poitiers, Service de Biochimie, Poitiers, F-86000, France.,MOPICT, IBiSA plateforme 'Experimental Surgery and Transplantation', Domaine du Magneraud, Surgères, F-17700, France
| | | | - Sophie Lamarre
- LISBP, Université de Toulouse, CNRS, INRA, INSA, Toulouse, F- 31077, France
| | - Virginie Ameteau
- Inserm U1082 IRTOMIT, Poitiers, F-86000, France.,Université de Poitiers, Faculté de Médecine et de Pharmacie, Poitiers, F-86000, France
| | - Solenne Tillet
- Inserm U1082 IRTOMIT, Poitiers, F-86000, France.,Université de Poitiers, Faculté de Médecine et de Pharmacie, Poitiers, F-86000, France
| | | | - Raphael Thuillier
- Inserm U1082 IRTOMIT, Poitiers, F-86000, France.,Université de Poitiers, Faculté de Médecine et de Pharmacie, Poitiers, F-86000, France.,CHU Poitiers, Service de Biochimie, Poitiers, F-86000, France
| | - Thierry Hauet
- Inserm U1082 IRTOMIT, Poitiers, F-86000, France. .,Université de Poitiers, Faculté de Médecine et de Pharmacie, Poitiers, F-86000, France. .,CHU Poitiers, Service de Biochimie, Poitiers, F-86000, France. .,MOPICT, IBiSA plateforme 'Experimental Surgery and Transplantation', Domaine du Magneraud, Surgères, F-17700, France. .,FHU SUPORT 'SUrvival oPtimization in ORgan Transplantation', Poitiers, F-86000, France.
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76
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Early activation of Egr-1 promotes neuroinflammation and dopaminergic neurodegeneration in an experimental model of Parkinson's disease. Exp Neurol 2018; 302:145-154. [DOI: 10.1016/j.expneurol.2018.01.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 12/26/2017] [Accepted: 01/08/2018] [Indexed: 01/10/2023]
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77
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Wu C, Qin N, Ren H, Yang M, Liu S, Wang Q. Metformin Regulating miR-34a Pathway to Inhibit Egr1 in Rat Mesangial Cells Cultured with High Glucose. Int J Endocrinol 2018; 2018:6462793. [PMID: 29681936 PMCID: PMC5841108 DOI: 10.1155/2018/6462793] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2017] [Revised: 12/10/2017] [Accepted: 01/03/2018] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Activating AMPKα negatively regulates Egr1 to inhibit inflammatory cytokines in high glucose. miR-34a inhibition increases phosphorylated AMPKα through mediating SIRT1 to suppress the development of fatty liver. AIM OF THE STUDY To clarify the function of Egr1 on the inflammation and fibrosis in high glucose-cultured MCs, as well as to explore the effects of metformin on miR-34a pathway and Egr1 expression. METHODS We transfected MCs with miR-34a inhibitor. And MCs were transfected with small interfering RNA for silencing Egr1 and SIRT1. Quantitative real-time PCR was used to assay the transcription levels of Egr1 mRNA and miR-34a. Western blot was used to test the protein. And ELISA was used to measure inflammatory factors. RESULTS High glucose upregulates Egr1 to aggravate the inflammation and fibrosis in MCs. miR-34a suppresses the activation of SIRT1/AMPKα and results in promoting Egr1 in high glucose-cultured MCs. Metformin attenuates high glucose-stimulated inflammation and fibrosis in MCs by regulating miR-34a-mediated SIRT1/AMPKα activity and the downstream Egr1 protein. CONCLUSION We enriched the effects of miR-34a pathway regulating Egr1 in high glucose-cultured MCs. It provides a foundation for future researches considering Egr1 as a therapeutic target and a new direction for the clinical application of metformin in early DKD.
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Affiliation(s)
- Can Wu
- Department of Endoscope, The First Hospital Affiliated to China Medical University, Shenyang, Liaoning, China
| | - Ningning Qin
- Department of Endocrinology, The Second People's Hospital of Fuxin City, Fuxin, Liaoning, China
| | - Huiwen Ren
- Department of Endocrinology, The First Hospital Affiliated to China Medical University, Shenyang, Liaoning, China
| | - Min Yang
- Department of Endocrinology, The First Hospital Affiliated to China Medical University, Shenyang, Liaoning, China
| | - Shuang Liu
- Department of Endocrinology, The First Hospital Affiliated to China Medical University, Shenyang, Liaoning, China
| | - Qiuyue Wang
- Department of Endocrinology, The First Hospital Affiliated to China Medical University, Shenyang, Liaoning, China
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78
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Sun T, Zhang Y, Zhong S, Gao F, Chen Y, Wang B, Cai W, Zhang Z, Li W, Lu S, Zheng F, Shi G. N-n-Butyl Haloperidol Iodide, a Derivative of the Anti-psychotic Haloperidol, Antagonizes Hypoxia/Reoxygenation Injury by Inhibiting an Egr-1/ROS Positive Feedback Loop in H9c2 Cells. Front Pharmacol 2018; 9:19. [PMID: 29422863 PMCID: PMC5789774 DOI: 10.3389/fphar.2018.00019] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 01/08/2018] [Indexed: 02/05/2023] Open
Abstract
Early growth response-1 (Egr-1), a transcription factor which often underlies the molecular basis of myocardial ischemia/reperfusion (I/R) injury, and oxidative stress, is key to myocardial I/R injury. Silent information regulator of transcription 1(SIRT1) not only interacts with and is inhibited by Egr-1, but also downregulates reactive oxygen species (ROS) via the Forkhead box O1(FOXO1)/manganese superoxide dismutase (Mn-SOD) signaling pathway. N-n-butyl haloperidol iodide (F2), a new patented compound, protects the myocardium against myocardial I/R injury in various animal I/R models in vivo and various heart-derived cell hypoxia/reoxygenation (H/R) models in vitro. In addition, F2 can regulate the abnormal ROS/Egr-1 signaling pathway in cardiac microvascular endothelial cells (CMECs) and H9c2 cells after H/R. We studied whether there is an inverse Egr-1/ROS signaling pathway in H9c2 cells and whether the SIRT1/FOXO1/Mn-SOD signaling pathway mediates this. We verified a ROS/Egr-1 signaling loop in H9c2 cells during H/R and that F2 protects against myocardial H/R injury by affecting SIRT1-related signaling pathways. Knockdown of Egr-1, by siRNA interference, reduced ROS generation, and alleviated oxidative stress injury induced by H/R, as shown by upregulated mitochondrial membrane potential, increased glutathione peroxidase (GSH-px) and total SOD anti-oxidative enzyme activity, and downregulated MDA. Decreases in FOXO1 protein expression and Mn-SOD activity occurred after H/R, but could be blocked by Egr-1 siRNA. F2 treatment attenuated H/R-induced Egr-1 expression, ROS generation and other forms of oxidative stress injury such as MDA, and prevented H/R-induced decreases in FOXO1 and Mn-SOD activity. Nuclear co-localization between Egr-1 and SIRT1 was increased by H/R and decreased by either Egr-1 siRNA or F2. Therefore, our results suggest that Egr-1 inhibits the SIRT1/FOXO1/Mn-SOD antioxidant signaling pathway to increase ROS and perpetuate I/R injury. F2 inhibits induction of Egr-1 by H/R, thereby activating SIRT1/FOXO1/Mn-SOD antioxidant signaling and decreasing H/R-induced ROS, demonstrating an important mechanism by which F2 protects against myocardial H/R injury.
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Affiliation(s)
- Ting Sun
- Department of Pharmacology, Shantou University Medical College, Shantou, China
| | - Yanmei Zhang
- Department of Pharmacology, Shantou University Medical College, Shantou, China
| | - Shuping Zhong
- Department of Biochemistry and Molecular Biology, University of Southern California, Los Angeles, CA, United States
| | - Fenfei Gao
- Department of Pharmacology, Shantou University Medical College, Shantou, China
| | - Yicun Chen
- Department of Pharmacology, Shantou University Medical College, Shantou, China
| | - Bin Wang
- Department of Pharmacology, Shantou University Medical College, Shantou, China
| | - Wenfeng Cai
- Department of Pharmacology, Shantou University Medical College, Shantou, China
| | - Zhaojing Zhang
- Department of Medical Genetics and Cell Biology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, China
| | - Weiqiu Li
- Analytical Cytology Laboratory, Shantou University Medical College, Shantou, China
| | - Shishi Lu
- Department of Pharmacy, The First Affiliated Hospital, Shantou University Medical College, Shantou, China
| | - Fuchun Zheng
- Clinical Pharmacology Laboratory, The First Affiliated Hospital, Shantou University Medical College, Shantou, China
- *Correspondence: Ganggang Shi, Fuchun Zheng,
| | - Ganggang Shi
- Department of Pharmacology, Shantou University Medical College, Shantou, China
- *Correspondence: Ganggang Shi, Fuchun Zheng,
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Ziegelhoeffer T, Heil M, Fischer S, Fernández B, Schaper W, Preissner KT, Deindl E, Pagel JI. Role of early growth response 1 in arteriogenesis: Impact on vascular cell proliferation and leukocyte recruitment in vivo. Thromb Haemost 2017; 107:562-74. [DOI: 10.1160/th11-07-0490] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Accepted: 12/13/2011] [Indexed: 02/07/2023]
Abstract
SummaryBased on previous findings that early growth response 1 (Egr-1) participates in leukocyte recruitment and cell proliferation in vitro, this study was designed to investigate its mode of action during arteriogenesis in vivo. In a model of peripheral arteriogenesis, Egr-1 was significantly upregulated in growing collaterals of wild-type (WT) mice, both on mRNA and protein level. Egr-1−/− mice demonstrated delayed arteriogenesis after femoral artery ligation. They further showed increased levels of monocytes and granulocytes in the circulation, but reduced levels in adductor muscles under baseline conditions. After femoral artery ligation, elevated numbers of macrophages were detected in the perivascular zone of collaterals in Egr-1−/− mice and mRNA of leukocyte recruitment mediators was upregulated. Other Egr family members (Egr-2 to -4) were significantly upregulated only in Egr-1−/− mice, suggesting a mechanism of counterbalancing Egr-1 deficiency. Moreover, splicing factor-1, downregulated in WT mice after femoral artery ligation in the process of increased vascular cell proliferation, was upregulated in Egr-1−/− mice. αSM-actin on the other hand, significantly downregulated in WT mice, showed no differential expression in Egr-1−/− mice. While cell cycle regulator cyclin E and cdc20 were upregulated in Egr-1−/− mice, cyclin D1 expression decreased below the detection limit in collaterals, and the proliferation marker ki67 was not differentially expressed. In conclusion, compensation for deficiency in Egr-1 function in leukocyte recruitment can presumably be mediated by other transcription factors; however, Egr-1 is indispensable for effective vascular cell cycle progression in arteriogenesis.
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80
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Kemme CA, Marquez R, Luu RH, Iwahara J. Potential role of DNA methylation as a facilitator of target search processes for transcription factors through interplay with methyl-CpG-binding proteins. Nucleic Acids Res 2017; 45:7751-7759. [PMID: 28486614 PMCID: PMC5569922 DOI: 10.1093/nar/gkx387] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 05/06/2017] [Indexed: 11/12/2022] Open
Abstract
Eukaryotic genomes contain numerous non-functional high-affinity sequences for transcription factors. These sequences potentially serve as natural decoys that sequester transcription factors. We have previously shown that the presence of sequences similar to the target sequence could substantially impede association of the transcription factor Egr-1 with its targets. In this study, using a stopped-flow fluorescence method, we examined the kinetic impact of DNA methylation of decoys on the search process of the Egr-1 zinc-finger protein. We analyzed its association with an unmethylated target site on fluorescence-labeled DNA in the presence of competitor DNA duplexes, including Egr-1 decoys. DNA methylation of decoys alone did not affect target search kinetics. In the presence of the MeCP2 methyl-CpG-binding domain (MBD), however, DNA methylation of decoys substantially (∼10-30-fold) accelerated the target search process of the Egr-1 zinc-finger protein. This acceleration did not occur when the target was also methylated. These results suggest that when decoys are methylated, MBD proteins can block them and thereby allow Egr-1 to avoid sequestration in non-functional locations. This effect may occur in vivo for DNA methylation outside CpG islands (CGIs) and could facilitate localization of some transcription factors within regulatory CGIs, where DNA methylation is rare.
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Affiliation(s)
- Catherine A Kemme
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, TX 77555-1068, USA
| | - Rolando Marquez
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, TX 77555-1068, USA
| | - Ross H Luu
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, TX 77555-1068, USA
| | - Junji Iwahara
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, TX 77555-1068, USA
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Wang J, Cheng W, Wang Z, Xin L, Zhang W. ATF3 inhibits the inflammation induced by Mycoplasma pneumonia in vitro and in vivo. Pediatr Pulmonol 2017; 52:1163-1170. [PMID: 28440917 DOI: 10.1002/ppul.23705] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 03/22/2017] [Indexed: 01/29/2023]
Abstract
OBJECTIVES Activating transcription factor-3 (ATF3) is a key regulator of inflammatory responses. We aimed to investigate the effects and mechanisms of ATF3 on the inflammatory cytokines are induced by Mycoplasma pneumonia (MP). STUDY DESIGN RAW264.7 and mouse peritoneal macrophages were exposed to various time with or without MP infection (3, 6, 12, 24, and 48 h), and detect the expression of ATF3. Adenovirus-expression of ATF3 (Ad/ATF3) or Ad/βgal was transfected into cells which were exposed to MP for 48 h, RT-PCR and ELISA was used to evaluate the expression and secretion of TNF-α, IL-1β, IL-6, and IL-18. In addition, intravenous administration Ad/ATF3 or Ad/βgal into the mice, the secretion of inflammatory cytokines were detected using ELISA. ChIP assay was used to determine whether ATF3 can bind to the promoter of Early growth response protein 1 (Egr-1). Western blot was used to detect the expression of Egr-1 and Fyn. RESULTS ATF3 was increased at 3, 6, 12, and 24 h and the highest expression levels occurs in 6 h, there is no significant differences at 24 and 48 h compared with 0 h or CON group in RAW 264.7. Similar results were seen in mouse peritoneal macrophages. Overexpression of ATF3 resulted in the reduction of inflammatory cytokines. ChIP assay revealed that ATF3 can bind to the promoter of Egr-1. Overexpression of ATF3 inhibited the protein expression of Egr-1 and Fyn; conversely, ATF3-deficiency promoted the expression of Egr-1 and Fyn. Overexpression of Egr-1 reduced the anti-inflammatory action of ATF3. CONCLUSIONS ATF3 inhibit the expression and release of TNF-α, IL-1β, IL-6, and IL-18 induced by MP in vitro and in vivo, which is associated with its negative regulation of Egr-1/Fyn signaling pathway.
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Affiliation(s)
- Jing Wang
- The Second Department of Respiration, Xi'an Children's Hospital, Xi'an, P. R. China
| | - Wei Cheng
- The Second Department of Respiration, Xi'an Children's Hospital, Xi'an, P. R. China
| | - Zhen Wang
- The Second Department of Respiration, Xi'an Children's Hospital, Xi'an, P. R. China
| | - Lihong Xin
- The Second Department of Respiration, Xi'an Children's Hospital, Xi'an, P. R. China
| | - Wen Zhang
- The Second Department of Respiration, Xi'an Children's Hospital, Xi'an, P. R. China
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Thiel G, Lesch A, Rubil S, Backes TM, Rössler OG. Regulation of Gene Transcription Following Stimulation of Transient Receptor Potential (TRP) Channels. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2017; 335:167-189. [PMID: 29305012 DOI: 10.1016/bs.ircmb.2017.07.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Transient receptor potential (TRP) channels belong to a heterogeneous superfamily of cation channels that are involved in the regulation of numerous biological functions, including regulation of Ca2+ and glucose homeostasis, tumorigenesis, temperature, and pain sensation. To understand the functions of TRP channels, their associated intracellular signaling pathways and molecular targets have to be identified on the cellular level. Stimulation of TRP channels frequently induces an influx of Ca2+ ions into the cells and the subsequent activation of protein kinases. These intracellular signal transduction pathways ultimately induce changes in the gene expression pattern of the cells. Here, we review the effects of TRPC6, TRPM3, and TRPV1 channel stimulation on the activation of the stimulus-responsive transcription factors AP-1, CREB, Egr-1, Elk-1, and NFAT. Following activation, these transcription factors induce the transcription of delayed response genes. We propose that many biological functions of TRP channels can be explained by the activation of stimulus-responsive transcription factors and their delayed response genes. The proteins encoded by those delayed response genes may be responsible for the biochemical and physiological changes following TRP channel activation.
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Affiliation(s)
- Gerald Thiel
- Saarland University Medical Faculty, Homburg, Germany.
| | - Andrea Lesch
- Saarland University Medical Faculty, Homburg, Germany
| | - Sandra Rubil
- Saarland University Medical Faculty, Homburg, Germany
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López-Díez R, Shen X, Daffu G, Khursheed M, Hu J, Song F, Rosario R, Xu Y, Li Q, Xi X, Zou YS, Li H, Schmidt AM, Yan SF. Ager Deletion Enhances Ischemic Muscle Inflammation, Angiogenesis, and Blood Flow Recovery in Diabetic Mice. Arterioscler Thromb Vasc Biol 2017. [PMID: 28642238 DOI: 10.1161/atvbaha.117.309714] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Diabetic subjects are at higher risk of ischemic peripheral vascular disease. We tested the hypothesis that advanced glycation end products (AGEs) and their receptor (RAGE) block angiogenesis and blood flow recovery after hindlimb ischemia induced by femoral artery ligation through modulation of immune/inflammatory mechanisms. APPROACH AND RESULTS Wild-type mice rendered diabetic with streptozotocin and subjected to unilateral femoral artery ligation displayed increased accumulation and expression of AGEs and RAGE in ischemic muscle. In diabetic wild-type mice, femoral artery ligation attenuated angiogenesis and impaired blood flow recovery, in parallel with reduced macrophage content in ischemic muscle and suppression of early inflammatory gene expression, including Ccl2 (chemokine [C-C motif] ligand-2) and Egr1 (early growth response gene-1) versus nondiabetic mice. Deletion of Ager (gene encoding RAGE) or transgenic expression of Glo1 (reduces AGEs) restored adaptive inflammation, angiogenesis, and blood flow recovery in diabetic mice. In diabetes mellitus, deletion of Ager increased circulating Ly6Chi monocytes and augmented macrophage infiltration into ischemic muscle tissue after femoral artery ligation. In vitro, macrophages grown in high glucose display inflammation that is skewed to expression of tissue damage versus tissue repair gene expression. Further, macrophages grown in high versus low glucose demonstrate blunted macrophage-endothelial cell interactions. In both settings, these adverse effects of high glucose were reversed by Ager deletion in macrophages. CONCLUSIONS These findings indicate that RAGE attenuates adaptive inflammation in hindlimb ischemia; underscore microenvironment-specific functions for RAGE in inflammation in tissue repair versus damage; and illustrate that AGE/RAGE antagonism may fill a critical gap in diabetic peripheral vascular disease.
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Affiliation(s)
- Raquel López-Díez
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Xiaoping Shen
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Gurdip Daffu
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Md Khursheed
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Jiyuan Hu
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Fei Song
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Rosa Rosario
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Yunlu Xu
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Qing Li
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Xiangmei Xi
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Yu Shan Zou
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Huilin Li
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Ann Marie Schmidt
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York
| | - Shi Fang Yan
- From the Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, Department of Medicine (R.L.D., X.S., G.D., M.K., F.S., R.R., Y.X., Q.L., X.X., Y.S.Z., A.M.S., S.F.Y.), Department of Population Health (J.H., H.L.), and Department of Environmental Science (H.L.), New York University School of Medicine, New York.
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Qin X, Wang Y, Paudel HK. Inhibition of Early Growth Response 1 in the Hippocampus Alleviates Neuropathology and Improves Cognition in an Alzheimer Model with Plaques and Tangles. THE AMERICAN JOURNAL OF PATHOLOGY 2017. [PMID: 28641077 DOI: 10.1016/j.ajpath.2017.04.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A sporadic form of Alzheimer disease (AD) and vascular dementia share many risk factors, and their pathogenic mechanisms are suggested to be related. Transcription factor early growth response 1 (Egr-1) regulates various vascular pathologies and is up-regulated in both AD brains and AD mouse models; however, its role in AD pathogenesis is unclear. Herein, we report that silencing of Egr-1 in the hippocampus by shRNA reduces tau phosphorylation, lowers amyloid-β (Aβ) pathology, and improves cognition in the 3xTg-AD mouse model. Egr-1 silencing does not affect levels of cyclin-dependent protein kinase 5 (Cdk5), glycogen synthase kinase 3β, protein phosphatase 1, or protein phosphatase 2A, but reduces p35 subunit of Cdk5. Egr-1 silencing also reduces levels of β-secretase 1 (BACE-1) and BACE-1-cleaved amyloid precursor protein (APP) metabolites (secreted APPβ, C99, Aβ40, and Aβ42) but has no effect on presenilin 1 and presenilin 2. In hippocampal primary neurons, Egr-1 binds to BACE-1 and p35 promoters, enhances tau phosphorylation, activates Cdk5 and BACE-1, and accelerates amyloidogenic APP processing. Blocking Cdk5 action blocks Egr-1-induced tau phosphorylation but has no effect on BACE-1 activation and amyloidogenic APP processing. Blocking BACE-1 action, on the other hand, blocks Egr-1-induced amyloidogenic APP processing but does not affect tau phosphorylation. Egr-1 regulates tau phosphorylation and Aβ synthesis in the brain by respectively controlling activities of Cdk5 and BACE-1, suggesting that Egr-1 is a potential therapeutic candidate for the treatment of AD.
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Affiliation(s)
- Xike Qin
- Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, Quebec, Canada
| | - Yunling Wang
- Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, Quebec, Canada
| | - Hemant K Paudel
- Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, Quebec, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, Quebec, Canada.
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85
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Genetic Adaptation of Schizothoracine Fish to the Phased Uplifting of the Qinghai-Tibetan Plateau. G3-GENES GENOMES GENETICS 2017; 7:1267-1276. [PMID: 28209761 PMCID: PMC5386875 DOI: 10.1534/g3.116.038406] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Many species of Schizothoracine, a subfamily of Cyprinidae, are highly endemic to the Qinghai–Tibetan Plateau (QTP). To characterize the adaptive changes associated with the Schizothoracine expansion at high altitudes, we sequenced tissue transcriptomes of two highland and two subhighland Schizothoracines and analyzed gene evolution patterns by comparing with lowland cyprinids. Phylogenetic tree reconstruction and divergence time estimation indicated that the common ancestor of Schizothoracine fish lived ∼32.7 million years ago (MYA), coinciding with the timing of the first phase of QTP uplifting. Both high- and subhigh-Schizothoracines demonstrated elevated dN/dS ratios in the protein-coding genes compared to lowland cyprinids, from which some biological processes implicated in altitude adaptation were commonly identified. On the other hand, the highland and subhighland lineages presented drastically divergent landscapes of positively selected genes (PSGs), enriched with very different gene ontology (GO) profiles, including those in “sensory organ morphogenesis,” “regulation of protein ubiquitination,” “blood circulation,” and “blood vessel development.” These results indicated different selection pressures imposed on the highland and subhighland lineages of the Schizothoracine subfamily, with a higher number of genes in the high-altitude species involved in adaptations such as sensory perception, blood circulation, and protein metabolism. Our study indicated divergent genetic adaptations in the aquatic species facing the phased uplifting of QTP.
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86
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Thiel G, Rössler OG. Resveratrol regulates gene transcription via activation of stimulus-responsive transcription factors. Pharmacol Res 2017; 117:166-176. [DOI: 10.1016/j.phrs.2016.12.029] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 12/16/2016] [Accepted: 12/18/2016] [Indexed: 01/10/2023]
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87
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Qin X, Wang Y, Paudel HK. Early Growth Response 1 (Egr-1) Is a Transcriptional Activator of β-Secretase 1 (BACE-1) in the Brain. J Biol Chem 2016; 291:22276-22287. [PMID: 27576688 DOI: 10.1074/jbc.m116.738849] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Indexed: 11/06/2022] Open
Abstract
Accumulation of amyloid-β peptide (Aβ) in the brain is regarded as central to Alzheimer's disease (AD) pathogenesis. Aβ is generated by a sequential cleavage of amyloid precursor protein (APP) by β-secretase 1 (BACE-1) followed by γ-secretase. BACE-1 cleavage of APP is the committed step in Aβ synthesis. Understanding the mechanism by which BACE-1 is activated leading to Aβ synthesis in the brain can provide better understanding of AD pathology and help to develop novel therapies. In this study, we found that the levels of Aβ and BACE-1 are significantly reduced in the brains of mice lacking transcription factor early growth response 1 (Egr-1) when compared with the WT. We demonstrate that in COS-7 cells, Egr-1 binds to the BACE-1 promoter and activates BACE-1 transcription. In rat hippocampal primary neurons, overexpression of Egr-1 induces BACE-1 expression, activates BACE-1, promotes amyloidogenic APP processing, and enhances Aβ synthesis. In mouse hippocampal primary neurons, knockdown of BACE-1 almost completely blocks Egr-1-induced amyloidogenic APP processing and Aβ synthesis. Our data indicate that Egr-1 promotes Aβ synthesis via transcriptional activation of BACE-1 and suggest that Egr-1 plays role in activation of BACE-1 and acceleration of Aβ synthesis in AD brain. Egr-1 is a potential therapeutic target for AD.
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Affiliation(s)
- Xike Qin
- From the Lady Davis Institute for Medical Research, Jewish General Hospital, and
| | - Yunling Wang
- From the Lady Davis Institute for Medical Research, Jewish General Hospital, and
| | - Hemant K Paudel
- From the Lady Davis Institute for Medical Research, Jewish General Hospital, and the Department of Neurology and Neurosurgery, McGill University, Montréal, Quebec H4H 1R3, Canada
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88
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Wang A, Zhang H, Liang Z, Xu K, Qiu W, Tian Y, Guo H, Jia J, Xing E, Chen R, Xiang Z, Liu J. U0126 attenuates ischemia/reperfusion-induced apoptosis and autophagy in myocardium through MEK/ERK/EGR-1 pathway. Eur J Pharmacol 2016; 788:280-285. [PMID: 27343376 DOI: 10.1016/j.ejphar.2016.06.038] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 06/15/2016] [Accepted: 06/22/2016] [Indexed: 12/31/2022]
Abstract
Myocardial ischemia is one of the main causes of sudden cardiac death worldwide. Depending on the cell type and stimulus, ERK activity mediates different anti-proliferative events, such as apoptosis, autophagy, and senescence. The aim of this study was to determine the protective effect of 1,4-diamino-2,3-dicyano-1,4-bis[2-aminophenylthio] butadiene (U0126), an ERK kinase inhibitor, on myocardial ischemia/reperfusion (I/R) injury and the mechanisms involved. An I/R model was established in vivo in C57BL/6 mice and in vitro using mouse cardiomyocytes, respectively. To evaluate the protective effects of U0126 on I/R injury, we measured the myocardial infarct area, apoptosis, and autophagy. Our data indicated that pretreatment with U0126 significantly reduced the infarct area caused by I/R. Moreover, U0126 reduced the caspase-3 activity and the number of TUNEL-positive cardiomyocytes, which together indicate decreased apoptosis. Additionally, U0126 remarkable reduced the level of Beclin-1 and LC3 and increased p62 expression, which indicates that U0126 suppressed H/R-induced autophagy. Furthermore, the relationship between U0126 and MEK/ERK pathway activation in H/R-induced cardiomyocytes was also investigated. U0126 ameliorated H/R injury through inhibition of the MEK/ERK pathway and by suppressing in the downstream EGR-1 expression. Together, our research suggests that U0126 may protect against H/R injury by preventing H/R-induced myocardium apoptosis and autophagy via the MEK/ERK/EGR-1 pathway, and may be a potential therapeutic approach for attenuating myocardial I/R injury.
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Affiliation(s)
- Anxing Wang
- The Second Department of Cardiovascular, Baoji City Traditional Chinese Medicine Hospital, Baoji, Shaanxi 721001, PR China
| | - Huijun Zhang
- The Second Department of Cardiovascular, Baoji City Traditional Chinese Medicine Hospital, Baoji, Shaanxi 721001, PR China.
| | - Zeming Liang
- The Second Department of Cardiovascular, Baoji City Traditional Chinese Medicine Hospital, Baoji, Shaanxi 721001, PR China
| | - Kai Xu
- The Second Department of Cardiovascular, Baoji City Traditional Chinese Medicine Hospital, Baoji, Shaanxi 721001, PR China
| | - Weifeng Qiu
- The Second Department of Cardiovascular, Baoji City Traditional Chinese Medicine Hospital, Baoji, Shaanxi 721001, PR China
| | - Yongbo Tian
- The Second Department of Cardiovascular, Baoji City Traditional Chinese Medicine Hospital, Baoji, Shaanxi 721001, PR China
| | - Hong Guo
- The Second Department of Cardiovascular, Baoji City Traditional Chinese Medicine Hospital, Baoji, Shaanxi 721001, PR China
| | - Junzheng Jia
- The Second Department of Cardiovascular, Baoji City Traditional Chinese Medicine Hospital, Baoji, Shaanxi 721001, PR China
| | - Erke Xing
- The Second Department of Cardiovascular, Baoji City Traditional Chinese Medicine Hospital, Baoji, Shaanxi 721001, PR China
| | - Rufei Chen
- The Second Department of Cardiovascular, Baoji City Traditional Chinese Medicine Hospital, Baoji, Shaanxi 721001, PR China
| | - Zongxing Xiang
- The Second Department of Cardiovascular, Baoji City Traditional Chinese Medicine Hospital, Baoji, Shaanxi 721001, PR China
| | - Jia Liu
- The Second Department of Cardiovascular, Baoji City Traditional Chinese Medicine Hospital, Baoji, Shaanxi 721001, PR China
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Esadze A, Chen C, Zandarashvili L, Roy S, Pettitt BM, Iwahara J. Changes in conformational dynamics of basic side chains upon protein-DNA association. Nucleic Acids Res 2016; 44:6961-70. [PMID: 27288446 PMCID: PMC5001603 DOI: 10.1093/nar/gkw531] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Accepted: 05/31/2016] [Indexed: 11/24/2022] Open
Abstract
Basic side chains play major roles in recognition of nucleic acids by proteins. However, dynamic properties of these positively charged side chains are not well understood. In this work, we studied changes in conformational dynamics of basic side chains upon protein–DNA association for the zinc-finger protein Egr-1. By nuclear magnetic resonance (NMR) spectroscopy, we characterized the dynamics of all side-chain cationic groups in the free protein and in the complex with target DNA. Our NMR order parameters indicate that the arginine guanidino groups interacting with DNA bases are strongly immobilized, forming rigid interfaces. Despite the strong short-range electrostatic interactions, the majority of the basic side chains interacting with the DNA phosphates exhibited high mobility, forming dynamic interfaces. In particular, the lysine side-chain amino groups exhibited only small changes in the order parameters upon DNA-binding. We found a similar trend in the molecular dynamics (MD) simulations for the free Egr-1 and the Egr-1–DNA complex. Using the MD trajectories, we also analyzed side-chain conformational entropy. The interfacial arginine side chains exhibited substantial entropic loss upon binding to DNA, whereas the interfacial lysine side chains showed relatively small changes in conformational entropy. These data illustrate different dynamic characteristics of the interfacial arginine and lysine side chains.
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Affiliation(s)
- Alexandre Esadze
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, TX 77555-1068, USA
| | - Chuanying Chen
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, TX 77555-1068, USA
| | - Levani Zandarashvili
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, TX 77555-1068, USA
| | - Sourav Roy
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, TX 77555-1068, USA
| | - B Montgometry Pettitt
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, TX 77555-1068, USA
| | - Junji Iwahara
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, TX 77555-1068, USA
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90
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Mikles DC, Bhat V, Schuchardt BJ, McDonald CB, Farooq A. Effect of osmolytes on the binding of EGR1 transcription factor to DNA. Biopolymers 2016; 103:74-87. [PMID: 25269753 DOI: 10.1002/bip.22556] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 08/16/2014] [Accepted: 08/19/2014] [Indexed: 11/11/2022]
Abstract
Osmolytes play a key role in maintaining protein stability and mediating macromolecular interactions within the intracellular environment of the cell. Herein, we show that osmolytes such as glycerol, sucrose, and polyethylene glycol 400 (PEG400) mitigate the binding of early growth response (protein) 1 (EGR1) transcription factor to DNA in a differential manner. Thus, while physiological concentrations of glycerol only moderately reduce the binding affinity, addition of sucrose and PEG400 is concomitant with a loss in the binding affinity by an order of magnitude. This salient observation suggests that EGR1 is most likely subject to conformational equilibrium and that the osmolytes exert their effect via favorable interactions with the unliganded conformation. Consistent with this notion, our analysis reveals that while EGR1 displays rather high structural stability in complex with DNA, the unliganded conformation becomes significantly destabilized in solution. In particular, while liganded EGR1 adopts a well-defined arc-like architecture, the unliganded protein samples a comparatively large conformational space between two distinct states that periodically interconvert between an elongated rod-like shape and an arc-like conformation on a submicrosecond time scale. Consequently, the ability of osmolytes to favorably interact with the unliganded conformation so as to stabilize it could account for the negative effect of osmotic stress on EGR1-DNA interaction observed here. Taken together, our study sheds new light on the role of osmolytes in modulating a key protein-DNA interaction.
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Affiliation(s)
- David C Mikles
- Department of Biochemistry and Molecular Biology, Leonard Miller School of Medicine, University of Miami, Miami, FL, 33136
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Zhou JM, Xu ZL, Li N, Zhao YW, Wang ZZ, Xiao W. Identification of cardioprotective agents from traditional Chinese medicine against oxidative damage. Mol Med Rep 2016; 14:77-88. [PMID: 27176126 PMCID: PMC4918535 DOI: 10.3892/mmr.2016.5243] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 02/23/2016] [Indexed: 01/18/2023] Open
Abstract
Reactive oxygen species are damaging to cardiomyocytes. H9c2 cardiomyocytes are commonly used to study the cellular mechanisms and signal transduction in cardiomyocytes, and to evaluate the cardioprotective effects of drugs following oxidative damage. The present study developed a robust, automated high throughput screening (HTS) assay to identify cardioprotective agents from a traditional Chinese medicine (TCM) library using a H2O2-induced oxidative damage model in H9c2 cells. Using this HTS format, several hits were identified as cardioprotective by detecting changes to cell viability using the cell counting kit (CCK)-8 assay. Two TCM extracts, KY-0520 and KY-0538, were further investigated. The results of the present study demonstrated that treatment of oxidatively damaged cells with KY-0520 or KY-0538 markedly increased the cell viability and superoxide dismutase activity, decreased lactate dehydrogenase activity and malondialdehyde levels, and inhibited early growth response-1 (Egr-1) protein expression. The present study also demonstrated that KY-0520 or KY-0538 treatment protected H9c2 cells from H2O2-induced apoptosis by altering the Bcl-2/Bax protein expression ratio, and decreasing the levels of cleaved caspase-3. In addition, KY-0520 and KY-0538 reduced the phosphorylation of ERK1/2 and p38-MAPK proteins, and inhibited the translocation of Egr-1 from the cytoplasm to nucleus in H2O2-treated H9c2 cells. These findings suggested that oxidatively damaged H9c2 cells can be used for the identification of cardioprotective agents that reduce oxidative stress by measuring cell viabilities using CCK-8 in an HTS format. The underlying mechanism of the cardioprotective activities of KY-0520 and KY-0538 may be attributed to their antioxidative activity, regulation of Egr-1 and apoptosis-associated proteins, and the inhibition of ERK1/2, p38-MAPK and Egr-1 signaling pathways.
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Affiliation(s)
- Jian-Ming Zhou
- State Key Laboratory of New‑Tech for Chinese Medicine Pharmaceutical Process, Jiangsu Kanion Modern Traditional Chinese Medicine Research Institute, Lianyungang, Jiangsu 222001, P.R. China
| | - Zhi-Liang Xu
- State Key Laboratory of New‑Tech for Chinese Medicine Pharmaceutical Process, Jiangsu Kanion Modern Traditional Chinese Medicine Research Institute, Lianyungang, Jiangsu 222001, P.R. China
| | - Na Li
- State Key Laboratory of New‑Tech for Chinese Medicine Pharmaceutical Process, Jiangsu Kanion Modern Traditional Chinese Medicine Research Institute, Lianyungang, Jiangsu 222001, P.R. China
| | - Yi-Wu Zhao
- State Key Laboratory of New‑Tech for Chinese Medicine Pharmaceutical Process, Jiangsu Kanion Modern Traditional Chinese Medicine Research Institute, Lianyungang, Jiangsu 222001, P.R. China
| | - Zhen-Zhong Wang
- State Key Laboratory of New‑Tech for Chinese Medicine Pharmaceutical Process, Jiangsu Kanion Modern Traditional Chinese Medicine Research Institute, Lianyungang, Jiangsu 222001, P.R. China
| | - Wei Xiao
- State Key Laboratory of New‑Tech for Chinese Medicine Pharmaceutical Process, Jiangsu Kanion Modern Traditional Chinese Medicine Research Institute, Lianyungang, Jiangsu 222001, P.R. China
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Trinh NT, Yamashita T, Ohneda K, Kimura K, Salazar GT, Sato F, Ohneda O. Increased Expression of EGR-1 in Diabetic Human Adipose Tissue-Derived Mesenchymal Stem Cells Reduces Their Wound Healing Capacity. Stem Cells Dev 2016; 25:760-73. [PMID: 26988763 DOI: 10.1089/scd.2015.0335] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The prevalence of type 2 diabetes mellitus (T2DM), which leads to diabetic complications, has been increasing worldwide. The possible applications of T2DM-derived stem cells in cell therapy are limited because their characteristics are still not fully understood. In this study, we characterized adipose tissue-derived mesenchymal stem cells (AT-MSCs) from diabetic patients (dAT-MSCs) and found that insulin receptor substrate-1 (IRS-1) was highly phosphorylated at serine 636/639 in dAT-MSCs. Moreover, we found that early growth response factor-1 (EGR-1) and its target genes of PTEN and GGPS1 were highly expressed in dAT-MSCs in comparison to healthy donor-derived AT-MSCs (nAT-MSCs). We observed impaired wound healing after the injection of dAT-MSCs in the ischemic flap mouse model. The expressions of EGR-1 and its target genes were diminished by small hairpin RNA-targeted EGR-1 (shEGR-1) and treatment with a mitogen-activated protein kinase/extracellular signal-regulated kinase (MAPK/ERK) inhibitor (PD98059). Importantly, dAT-MSCs with shEGR-1 were able to restore the wound healing ability in the mouse model. Interestingly, under hypoxic conditions, hypoxia-inducible factor-1α (HIF-1α) can bind to the EGR-1 promoter in dAT-MSCs, but not in nAT-MSCs. Together, these results demonstrate that the expression of EGR-1 was upregulated in dAT-MSCs through two pathways: the main regulatory pathway is the MAPK/ERK pathway, the other is mediated by HIF-1α through direct transcriptional activation at the promoter region of the EGR1 gene. Our study suggests that dAT-MSCs may contribute to microvascular damage and delay wound healing through the overexpression of EGR-1. Interrupting the expression of EGR-1 in dAT-MSCs may be a useful treatment for chronic wounds in diabetic patients.
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Affiliation(s)
- Nhu-Thuy Trinh
- 1 Graduate School of Comprehensive Human Science, Laboratory of Regenerative Medicine and Stem Cell Biology, University of Tsukuba , Tsukuba, Japan
| | - Toshiharu Yamashita
- 1 Graduate School of Comprehensive Human Science, Laboratory of Regenerative Medicine and Stem Cell Biology, University of Tsukuba , Tsukuba, Japan
| | - Kinuko Ohneda
- 2 Laboratory of Molecular Pathophysiology, Faculty of Pharmacy, Takasaki University of Health and Welfare , Takasaki, Japan
| | - Kenichi Kimura
- 1 Graduate School of Comprehensive Human Science, Laboratory of Regenerative Medicine and Stem Cell Biology, University of Tsukuba , Tsukuba, Japan
| | - Georgina To'a Salazar
- 1 Graduate School of Comprehensive Human Science, Laboratory of Regenerative Medicine and Stem Cell Biology, University of Tsukuba , Tsukuba, Japan
| | - Fujio Sato
- 3 Department of Cardiovascular Surgery, University of Tsukuba , Tsukuba, Japan
| | - Osamu Ohneda
- 1 Graduate School of Comprehensive Human Science, Laboratory of Regenerative Medicine and Stem Cell Biology, University of Tsukuba , Tsukuba, Japan
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93
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Egr-1 deficiency protects from renal inflammation and fibrosis. J Mol Med (Berl) 2016; 94:933-42. [DOI: 10.1007/s00109-016-1403-6] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Revised: 02/04/2016] [Accepted: 02/29/2016] [Indexed: 10/22/2022]
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94
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Chang CZ, Wu SC. 4'-O-β-D-Glucosyl-5-O-Methylvisamminol, A Natural Histone H3 Phosphorylation Epigenetic Suppressor, Exerts a Neuroprotective Effect Through PI3K/Akt Signaling Pathway on Focal Cerebral Ischemia in Rats. World Neurosurg 2016; 89:474-88. [PMID: 26868427 DOI: 10.1016/j.wneu.2016.01.061] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 01/15/2016] [Accepted: 01/19/2016] [Indexed: 11/16/2022]
Abstract
BACKGROUND A bursting inflammation has been observed that compromises neurologic function in patients who experience stroke. We sought to examine the neuroprotective efficacy of 4'-O-β-D-glucosyl-5-O-methylvisamminol (OGOMV), a novel histone H3 phosphorylation epigenetic suppressor) in a transient middle cerebral artery occlusion (tMCAO). METHODS A rodent tMCAO model was used. Administration with 400 μg/kg/day OGOMV was initiated 12 hours before (prevention) and 1 hour after animals were subjected to tMCAO (reversal). The cerebral cortex was harvested to examine protein kinase B (PI3D/Akt), 5-bromo-2'-deoxyuridine (Western blot), and caspases (reverse-transcription polymerase chain reaction). In addition, cerebrospinal fluid samples were collected to examine interleukin 1-β, interleukin-6, monocyte chemoattractant protein-1, and tumor necrosis factor-α (reverse-transcription polymerase chain reaction). RESULTS Cortical 5-bromo-2'-deoxyuridine and phospho-PI3D/Akt were reduced in tMCAO animals, compared with the healthy controls but increased in the OGOMV treatment and prevention groups. Activated cortical caspase-3,-6, and -9a as well as increased IL-1β and TNF-α levels were observed in the tMCAO animals (P < 0.05). Both prevention and treatment with OGOMV significantly reduced cleaved caspase-3 and -9a groups, but no significant change in caspase-6 was noted. Perifosine, an Akt inhibitor, was added to reduce the bioexpression of phospho-P13D/Akt, and Bcl-2 level and increased cleaved caspase-9a level in both OGOMV prevention and treatment tMCAO groups (P > 0.05). CONCLUSION Our study suggests that OGOMV could exert a neuroprotective effect by inhibiting the P13D/Akt protein, attenuating inflammation, and cleaved caspase-3- and -9a-related apoptosis. This study also lends credence to support the notion that the prevention of OGOMV could attenuate proinflammatory cytokine mRNA and late-onset caspases in tMCAO and merits further study.
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Affiliation(s)
- Chih-Zen Chang
- Department of Surgery, Faculty of Medicine, School of Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Division of Neurosurgery, Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Department of Surgery, Kaohsiung Municipal Ta Tung Hospital, Kaohsiung, Taiwan.
| | - Shu-Chuan Wu
- Division of Neurosurgery, Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
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95
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Early Growth Response-1 Plays an Important Role in Ischemia-Reperfusion Injury in Lung Transplants by Regulating Polymorphonuclear Neutrophil Infiltration. Transplantation 2016; 99:2285-93. [PMID: 26079744 DOI: 10.1097/tp.0000000000000783] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Early growth response-1 (Egr-1) has been shown to be a trigger-switch transcription factor that is involved in lung ischemia-reperfusion injury (IRI). METHODS Mouse lung transplants were performed in wild-type (WT) C57BL/6 and Egr1-knockout (KO) mice in the following donor → recipient combinations: WT → WT, KO → WT, WT → KO, and KO → KO to determine whether the presence of Egr-1 in the donor or recipient is the most critical factor for IRI. Pulmonary grafts were retrieved after 18 hours of ischemia after 4 hours of reperfusion. We analyzed graft function by analyzing arterial blood gas and histology in each combination and assessed the effects of Egr1 depletion on inflammatory cytokines that are regulated by Egr-1 as well on polymorphonuclear neutrophil (PMN) infiltration. RESULTS Deletion of Egr1 improved pulmonary graft function in the following order of donor → recipient combinations: WT → WT < WT → KO < KO → WT < KO → KO. Polymerase chain reaction assays for Il1B, Il6, Mcp1, Mip2, Icam1, and Cox2 showed significantly lower expression levels in the KO → KO group than in the other groups. Immunohistochemistry demonstrated clear Egr-1 expression in the nuclei of pulmonary artery endothelial cells and PMN cytoplasm in the WT grafts. Flow cytometry analysis showed that Egr1 deletion reduced PMN infiltration and that the extent of reduction correlated with graft function. CONCLUSIONS Both graft and recipient Egr-1 played a role in lung IRI, but the graft side contributed more to this phenomenon through regulation of PMN infiltration. Donor Egr-1 expression in pulmonary artery endothelial cells may play an important role in PMN infiltration, which results in IRI after lung transplantation.
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96
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Revuelta M, Arteaga O, Alvarez A, Martinez-Ibargüen A, Hilario E. Characterization of Gene Expression in the Rat Brainstem After Neonatal Hypoxic–Ischemic Injury and Antioxidant Treatment. Mol Neurobiol 2016; 54:1129-1143. [DOI: 10.1007/s12035-016-9724-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 01/13/2016] [Indexed: 11/29/2022]
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97
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Lu S, Zhang Y, Zhong S, Gao F, Chen Y, Li W, Zheng F, Shi G. N-n-butyl Haloperidol Iodide Protects against Hypoxia/Reoxygenation Injury in Cardiac Microvascular Endothelial Cells by Regulating the ROS/MAPK/Egr-1 Pathway. Front Pharmacol 2016; 7:520. [PMID: 28111550 PMCID: PMC5216659 DOI: 10.3389/fphar.2016.00520] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2016] [Accepted: 12/15/2016] [Indexed: 02/05/2023] Open
Abstract
Endothelium dysfunction induced by reactive oxygen species (ROS) is an important initial event at the onset of myocardial ischemia/reperfusion in which the Egr-1 transcription factor often serves as a master switch for various damage pathways following reperfusion injury. We hypothesized that an intracellular ROS/MAPK/Egr-1 signaling pathway is activated in cardiac microvascular endothelial cells (CMECs) following hypoxia/reoxygenation (H/R). ROS generation, by either H/R or the ROS donor xanthine oxidase-hypoxanthine (XO/HX) activated all three MAPKs (ERK1/2, JNK, p38), and induced Egr-1 expression and Egr-1 DNA-binding activity in CMECs, whereas ROS scavengers (EDA and NAC) had the opposite effect following H/R. Inhibitors of all three MAPKs individually inhibited induction of Egr-1 expression by H/R in CMECs. Moreover, N-n-butyl haloperidol (F2), previously shown to protect cardiomyocytes subjected to I/R, dose-dependently downregulated H/R-induced ROS generation, MAPK activation, and Egr-1 expression and activity in CMECs, whereas XO/HX and MAPK activators (EGF, anisomycin) antagonized the effects of F2. Inhibition of the ROS/MAPK/Egr-1 signaling pathway, by either F2, NAC, or inhibition of MAPK, increased CMEC viability and the GSH/GSSG ratio, and decreased Egr-1 nuclear translocation. These results show that the ROS/MAPK/Egr-1 signaling pathway mediates H/R injury in CMECs, and F2 blocks this pathway to protect against H/R injury and further alleviate myocardial I/R injury.
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Affiliation(s)
- Shishi Lu
- Department of Pharmacy, the First Affiliated Hospital, Shantou University Medical CollegeShantou, China
| | - Yanmei Zhang
- Department of Pharmacology, Shantou University Medical CollegeShantou, China
| | - Shuping Zhong
- Department of Biochemistry and Molecular Biology, University of Southern CaliforniaLos Angeles, CA, USA
| | - Fenfei Gao
- Department of Pharmacology, Shantou University Medical CollegeShantou, China
| | - Yicun Chen
- Department of Pharmacology, Shantou University Medical CollegeShantou, China
| | - Weiqiu Li
- Analytical Cytology Laboratory, Shantou University Medical CollegeShantou, China
| | - Fuchun Zheng
- Department of Clinical Pharmacology Laboratory, the First Affiliated Hospital, Shantou University Medical CollegeShantou, China
- *Correspondence: Fuchun Zheng
| | - Ganggang Shi
- Department of Pharmacology, Shantou University Medical CollegeShantou, China
- Department of Cardiovascular Diseases, the First Affiliated Hospital, Shantou University Medical CollegeShantou, China
- Ganggang Shi
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98
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Ramasamy R, Shekhtman A, Schmidt AM. The multiple faces of RAGE--opportunities for therapeutic intervention in aging and chronic disease. Expert Opin Ther Targets 2015; 20:431-46. [PMID: 26558318 DOI: 10.1517/14728222.2016.1111873] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
INTRODUCTION This review focuses on the multi-ligand receptor of the immunoglobulin superfamily--receptor for advanced glycation endproducts (RAGE). The accumulation of the multiple ligands of RAGE in cellular stress milieux links RAGE to the pathobiology of chronic disease and natural aging. AREAS COVERED In this review, we present a discussion on the ligands of RAGE and the implications of these ligand families in disease. We review the recent literature on the role of ligand-RAGE interaction in the consequences of natural aging; the macro- and microvascular complications of diabetes; obesity and insulin resistance; autoimmune disorders and chronic inflammation; and tumors and Alzheimer's disease. We discuss the mechanisms of RAGE signaling through its intracellular binding effector molecule--the formin DIAPH1. Physicochemical evidence of how the RAGE cytoplasmic domain binds to the FH1 (formin homology 1) domain of DIAPH1, and the consequences thereof, are also reviewed. EXPERT OPINION We discuss the modalities of RAGE antagonism currently in preclinical and clinical studies. Finally, we present the rationale behind potentially targeting the RAGE cytoplasmic domain-DIAPH1 interaction as a logical strategy for therapeutic intervention in the pathological settings of chronic diseases and aging wherein RAGE ligands accumulate and signal.
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Affiliation(s)
- Ravichandran Ramasamy
- a Diabetes Research Program, Division of Endocrinology, Department of Medicine , New York University Langone Medical Center , New York , NY 10016 , USA
| | - Alexander Shekhtman
- b Department of Chemistry , University at Albany, State University of New York , Albany , NY 12222 , USA
| | - Ann Marie Schmidt
- a Diabetes Research Program, Division of Endocrinology, Department of Medicine , New York University Langone Medical Center , New York , NY 10016 , USA
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99
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Kemme CA, Esadze A, Iwahara J. Influence of quasi-specific sites on kinetics of target DNA search by a sequence-specific DNA-binding protein. Biochemistry 2015; 54:6684-91. [PMID: 26502071 PMCID: PMC4642223 DOI: 10.1021/acs.biochem.5b00967] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Functions
of transcription factors require formation of specific
complexes at particular sites in cis-regulatory elements of genes.
However, chromosomal DNA contains numerous sites that are similar
to the target sequences recognized by transcription factors. The influence
of such “quasi-specific” sites on functions of the transcription
factors is not well understood at present by experimental means. In
this work, using fluorescence methods, we have investigated the influence
of quasi-specific DNA sites on the efficiency of target location by
the zinc finger DNA-binding domain of the inducible transcription
factor Egr-1, which recognizes a 9 bp sequence. By stopped-flow assays,
we measured the kinetics of Egr-1’s association with a target
site on 143 bp DNA in the presence of various competitor DNAs, including
nonspecific and quasi-specific sites. The presence of quasi-specific
sites on competitor DNA significantly decelerated the target association
by the Egr-1 protein. The impact of the quasi-specific sites depended
strongly on their affinity, their concentration, and the degree of
their binding to the protein. To quantitatively describe the kinetic
impact of the quasi-specific sites, we derived an analytical form
of the apparent kinetic rate constant for the target association and
used it for fitting to the experimental data. Our kinetic data with
calf thymus DNA as a competitor suggested that there are millions
of high-affinity quasi-specific sites for Egr-1 among the 3 billion
bp of genomic DNA. This study quantitatively demonstrates that naturally
abundant quasi-specific sites on DNA can considerably impede the target
search processes of sequence-specific DNA-binding proteins.
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Affiliation(s)
- Catherine A Kemme
- Department of Biochemistry & Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch , Galveston, Texas 77555, United States
| | - Alexandre Esadze
- Department of Biochemistry & Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch , Galveston, Texas 77555, United States
| | - Junji Iwahara
- Department of Biochemistry & Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch , Galveston, Texas 77555, United States
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100
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Han H, Xue-Franzén Y, Miao X, Nagy E, Li N, Xu D, Sjöberg J, Björkholm M, Claesson HE. Early growth response gene (EGR)-1 regulates leukotriene D4-induced cytokine transcription in Hodgkin lymphoma cells. Prostaglandins Other Lipid Mediat 2015; 121:122-30. [DOI: 10.1016/j.prostaglandins.2015.06.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 05/29/2015] [Accepted: 06/16/2015] [Indexed: 12/29/2022]
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