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Zheng T, Shen B, Bai Y, Li E, Zhang X, Hu Y, Gao T, Dong Q, Zhu L, Jin R, Shi H, Liu H, Gao Y, Liu X, Cao C. The PKA-CREB1 axis regulates coronavirus proliferation by viral helicase nsp13 association. J Virol 2024; 98:e0156523. [PMID: 38445884 PMCID: PMC11019953 DOI: 10.1128/jvi.01565-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Accepted: 01/09/2024] [Indexed: 03/07/2024] Open
Abstract
The COVID-19 pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has posed a worldwide threat in the past 3 years. Although it has been widely and intensively investigated, the mechanism underlying the coronavirus-host interaction requires further elucidation, which may contribute to the development of new antiviral strategies. Here, we demonstrated that the host cAMP-responsive element-binding protein (CREB1) interacts with the non-structural protein 13 (nsp13) of SARS-CoV-2, a conserved helicase for coronavirus replication, both in cells and in lung tissues subjected to SARS-CoV-2 infection. The ATPase and helicase activity of viral nsp13 were shown to be potentiated by CREB1 association, as well as by Protein kinase A (PKA)-mediated CREB1 activation. SARS-CoV-2 replication is significantly suppressed by PKA Cα, cAMP-activated protein kinase catalytic subunit alpha (PRKACA), and CREB1 knockdown or inhibition. Consistently, the CREB1 inhibitor 666-15 has shown significant antiviral effects against both the WIV04 strain and the Omicron strain of the SARS-CoV-2. Our findings indicate that the PKA-CREB1 signaling axis may serve as a novel therapeutic target against coronavirus infection. IMPORTANCE In this study, we provide solid evidence that host transcription factor cAMP-responsive element-binding protein (CREB1) interacts directly with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) helicase non-structural protein 13 (nsp13) and potentiate its ATPase and helicase activity. And by live SARS-CoV-2 virus infection, the inhibition of CREB1 dramatically impairs SARS-CoV-2 replication in vivo. Notably, the IC50 of CREB1 inhibitor 666-15 is comparable to that of remdesivir. These results may extend to all highly pathogenic coronaviruses due to the conserved nsp13 sequences in the virus.
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Affiliation(s)
- Tong Zheng
- Genetic Engineering Research Laboratory, Beijing Institute of Biotechnology, Beijing, China
| | - Beilei Shen
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Yu Bai
- Institute of Physical Science and Information Technology, Anhui University, Hefei, Anhui, China
| | - Entao Li
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
- Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
| | - Xun Zhang
- Institute of Physical Science and Information Technology, Anhui University, Hefei, Anhui, China
| | - Yong Hu
- Genetic Engineering Research Laboratory, Beijing Institute of Biotechnology, Beijing, China
| | - Ting Gao
- Genetic Engineering Research Laboratory, Beijing Institute of Biotechnology, Beijing, China
| | - Qincai Dong
- Genetic Engineering Research Laboratory, Beijing Institute of Biotechnology, Beijing, China
| | - Lin Zhu
- Genetic Engineering Research Laboratory, Beijing Institute of Biotechnology, Beijing, China
| | - Rui Jin
- Genetic Engineering Research Laboratory, Beijing Institute of Biotechnology, Beijing, China
| | - Hui Shi
- Genetic Engineering Research Laboratory, Beijing Institute of Biotechnology, Beijing, China
| | - Hainan Liu
- Genetic Engineering Research Laboratory, Beijing Institute of Biotechnology, Beijing, China
| | - Yuwei Gao
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Xuan Liu
- Genetic Engineering Research Laboratory, Beijing Institute of Biotechnology, Beijing, China
| | - Cheng Cao
- Genetic Engineering Research Laboratory, Beijing Institute of Biotechnology, Beijing, China
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Zhao YY, Zhang LJ, Liang XY, Zhang XC, Chang JR, Shi M, Liu H, Zhou Y, Sun Z, Zhao YF. Pyruvate Upregulates Hepatic FGF21 Expression by Activating PDE and Inhibiting cAMP–Epac–CREB Signaling Pathway. Int J Mol Sci 2022; 23:ijms23105490. [PMID: 35628302 PMCID: PMC9141208 DOI: 10.3390/ijms23105490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 05/12/2022] [Accepted: 05/13/2022] [Indexed: 02/01/2023] Open
Abstract
Fibroblast growth factor 21 (FGF21) functions as a polypeptide hormone to regulate glucose and lipid metabolism, and its expression is regulated by cellular metabolic stress. Pyruvate is an important intermediate metabolite that acts as a key hub for cellular fuel metabolism. However, the effect of pyruvate on hepatic FGF21 expression and secretion remains unknown. Herein, we examined the gene expression and protein levels of FGF21 in human hepatoma HepG2 cells and mouse AML12 hepatocytes in vitro, as well as in mice in vivo. In HepG2 and AML12 cells, pyruvate at concentrations above 0.1 mM significantly increased FGF21 expression and secretion. The increase in cellular cAMP levels by adenylyl cyclase activation, phosphodiesterase (PDE) inhibition and 8-Bromo-cAMP administration significantly restrained pyruvate-stimulated FGF21 expression. Pyruvate significantly increased PDE activities, reduced cAMP levels and decreased CREB phosphorylation. The inhibition of exchange protein directed activated by cAMP (Epac) and cAMP response element binding protein (CREB) upregulated FGF21 expression, upon which pyruvate no longer increased FGF21 expression. The increase in plasma pyruvate levels in mice induced by the intraperitoneal injection of pyruvate significantly increased FGF21 gene expression and PDE activity with a reduction in cAMP levels and CREB phosphorylation in the mouse liver compared with the control. In conclusion, pyruvate activates PDEs to reduce cAMP and then inhibits the cAMP–Epac–CREB signaling pathway to upregulate FGF21 expression in hepatocytes.
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Pan L, Niu Z, Gao Y, Wang L, Liu Z, Liu J, Sun J, Pei H. Silencing of CREB Inhibits HDAC2/TLR4/NF-κB Cascade to Relieve Severe Acute Pancreatitis-Induced Myocardial Injury. Inflammation 2021; 44:1565-1580. [PMID: 33725236 DOI: 10.1007/s10753-021-01441-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 02/06/2021] [Accepted: 02/19/2021] [Indexed: 02/08/2023]
Abstract
The purpose of the present study is to investigate the role of CREB in cardiomyocytes proliferation in regulation of HDAC2-dependent TLR4/NF-κB pathway in severe acute pancreatitis (SAP)-induced myocardial injury. The SAP rat model was developed by injecting sodium touracholate into SD rats and then infected with lentivirus vectors expressing sh-CREB in the presence/absence of LPS. The pathological alterations of rat pancreatic and cardiac tissues were observed by HE staining. TUNEL assay was used to study apoptosis of cardiomyocytes. Next, the loss- and gain-function assay was conducted in LPS-induced myocardial injury cardiomyocytes to define the roles of CREB, HDAC2, and TLR4 in cardiomyocyte proliferation, apoptosis, inflammation, and myocardial injury in vitro. ChIP assay was used to study the enrichment of CREB bound to HDAC2 promoter. RT-qPCR and Western blot analysis were used to detect the expressions of related mRNA and proteins in the NF-κB pathway, respectively. CREB was found to be overexpressed in both SAP tissues and cells. CREB directly bound to the promoter of HDAC2 and activated its expression. Overexpressed CREB or HDAC2 inhibited proliferation and promoted apoptosis of cardiomyocytes. Suppression of CREB inhibited the HDAC2/TLR4/NF-κB cascade to promote proliferation and inhibit apoptosis of cardiomyocytes. The in vitro results were validated in vivo experiments. Coherently, suppression of CREB can inhibit HDAC2/TLR4/NF-κB cascade to promote cardiomyocyte proliferation, thus ameliorating SAP-induced myocardial injury.
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Affiliation(s)
- Longfei Pan
- Department of Emergency, the Second Affiliated Hospital of Xi'an Jiaotong University, No. 157 Xiwu Road, Xincheng District, 710004, Xi'an, Shaanxi Province, People's Republic of China.
| | - Zequn Niu
- Department of Emergency, the Second Affiliated Hospital of Xi'an Jiaotong University, No. 157 Xiwu Road, Xincheng District, 710004, Xi'an, Shaanxi Province, People's Republic of China
| | - Yanxia Gao
- Department of Emergency, the Second Affiliated Hospital of Xi'an Jiaotong University, No. 157 Xiwu Road, Xincheng District, 710004, Xi'an, Shaanxi Province, People's Republic of China
| | - Liming Wang
- Department of Emergency, the Second Affiliated Hospital of Xi'an Jiaotong University, No. 157 Xiwu Road, Xincheng District, 710004, Xi'an, Shaanxi Province, People's Republic of China
| | - Zhong Liu
- Department of Emergency, the Second Affiliated Hospital of Xi'an Jiaotong University, No. 157 Xiwu Road, Xincheng District, 710004, Xi'an, Shaanxi Province, People's Republic of China
| | - Jie Liu
- Department of Emergency, the Second Affiliated Hospital of Xi'an Jiaotong University, No. 157 Xiwu Road, Xincheng District, 710004, Xi'an, Shaanxi Province, People's Republic of China
| | - Jiangli Sun
- Department of Emergency, the Second Affiliated Hospital of Xi'an Jiaotong University, No. 157 Xiwu Road, Xincheng District, 710004, Xi'an, Shaanxi Province, People's Republic of China
| | - Honghong Pei
- Department of Emergency, the Second Affiliated Hospital of Xi'an Jiaotong University, No. 157 Xiwu Road, Xincheng District, 710004, Xi'an, Shaanxi Province, People's Republic of China
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Gong S, Hao X, Bi Y, Yang C, Wang W, Mickael HK, Zhang Y, Chen S, Qian Z, Huang F, Wei D, Yu W. Hepatitis E viral infection regulates estrogen signaling pathways: Inhibition of the cAMPK-PKA-CREB and PI3K-AKT-mTOR signaling pathways. J Med Virol 2021; 93:3769-3778. [PMID: 33128390 DOI: 10.1002/jmv.26641] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 10/17/2020] [Accepted: 10/25/2020] [Indexed: 12/22/2022]
Abstract
Hepatitis E virus (HEV) infection has become a global concern with high mortality rates among pregnant women, especially those in their third trimester of pregnancy. Estrogen plays an important role in mediating the body, regulating physiological and pathological processes. Estrogen is activated by binding to estrogen receptors (ERs) and mediates rapid signaling events by pathways that involve transmembrane ERs. Our previous study had confirmed that high estrogen levels during pregnancy are associated with high HEV titers. However, the association between HEV infection and estrogen signaling pathways remains unclear. In the present study, the regulation of estrogen signaling pathways by HEV infection was evaluated. Results demonstrated that HEV infection significantly inhibits the cAMP-PKA-CREB and PI3K-AKT-mTOR signaling pathways, but is independent of the Ras-Raf-MEK-ERK signaling pathway. In summary, the increasing estrogen levels and highly activated ERα during pregnancy aggravates HEV replication. The exacerbation of HEV replication, in turn, inhibits ERα expression and suppresses both cAMP-PKA-CREB and PI3K-AKT-mTOR signaling pathways.
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Affiliation(s)
- Shilin Gong
- Medical School, Kunming University of Science and Technology, Kunming, PR China
- Yunnan Provincial Key Laboratory of Clinical Virology, Kunming, PR China
| | - Xianhui Hao
- Medical School, Kunming University of Science and Technology, Kunming, PR China
| | - Yanhong Bi
- Medical School, Kunming University of Science and Technology, Kunming, PR China
| | - Chenchen Yang
- Medical School, Kunming University of Science and Technology, Kunming, PR China
| | - Wenjing Wang
- Medical School, Kunming University of Science and Technology, Kunming, PR China
| | - Houfack K Mickael
- Medical School, Kunming University of Science and Technology, Kunming, PR China
| | - Yike Zhang
- Medical School, Kunming University of Science and Technology, Kunming, PR China
| | - Shuangfeng Chen
- Medical School, Kunming University of Science and Technology, Kunming, PR China
| | - Zhongyao Qian
- Medical School, Kunming University of Science and Technology, Kunming, PR China
| | - Fen Huang
- Medical School, Kunming University of Science and Technology, Kunming, PR China
- Yunnan Provincial Key Laboratory of Clinical Virology, Kunming, PR China
| | - Daqiao Wei
- Medical School, Kunming University of Science and Technology, Kunming, PR China
| | - Wenhai Yu
- Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, PR China
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Ding Y, Jiang Y, Im ST, Myung S, Kim HS, Lee SH. Diphlorethohydroxycarmalol inhibits melanogenesis via protein kinase A/cAMP response element-binding protein and extracellular signal-regulated kinase-mediated microphthalmia-associated transcription factor downregulation in α-melanocyte stimulating hormone-stimulated B16F10 melanoma cells and zebrafish. Cell Biochem Funct 2021; 39:546-554. [PMID: 33474761 DOI: 10.1002/cbf.3620] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 12/14/2020] [Accepted: 01/05/2021] [Indexed: 11/08/2022]
Abstract
Diphlorethohydroxycarmalol (DPHC) is a marine polyphenolic compound derived from brown alga Ishige okamurae. A previously study has suggested that DPHC possesses strong mushroom tyrosinase inhibitory activity. However, the anti-melanogenesis effect of DPHC has not been reported at cellular level. The objective of the present study was to clarify the melanogenesis inhibitory effect of DPHC and its molecular mechanisms in murine melanoma cells (B16F10) and zebrafish model. DPHC significantly inhibited tyrosinase activity and melanin content dose-dependently in α-melanocyte stimulating hormone (α-MSH)-stimulated B16F10 cells. This polyphenolic compound also suppressed the expression of phosphorylation of cAMP response element-binding protein (CREB) by attenuating phosphorylation of cAMP-dependent protein kinase A, resulting in decreased MITF expression levels. Furthermore, DPHC downregulated MITF protein expression levels by promoting the phosphorylation of extracellular signal-regulated kinase. It also inhibited tyrosinase, tyrosinase-related protein 1 (TRP-1), and TRP-2 in α-MSH stimulated B16F10 cells. In in vivo studies using zebrafish, DPHC also markedly inhibited melanin synthesis in a dose-dependent manner. These results demonstrate that DPHC can effectively inhibit melanogenesis in melanoma cells in vitro and in zebrafish in vivo, suggesting that DPHC could be applied in fields of pharmaceutical and cosmeceuticals as a skin-whitening agent. Significance of study: The present study showed for the first time that DPHC could inhibit a-MSH-stimulated melanogenesis via PKA/CREB and ERK pathway in melanoma cells. It also could inhibit pigmentation in vivo in a zebrafish model. This evidence suggests that DPHC has potential as a skin whitening agent. Taken together, DPHC could be considered as a novel anti-melanogenic agent to be applied in cosmetic, food, and medical industry.
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Affiliation(s)
- Yuling Ding
- Department of Biopharmaceuticals, School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Chanchun, China
| | - Yunfei Jiang
- Department of Marine Life Science, Jeju National University, Jeju, Republic of Korea
| | - Seung Tae Im
- Department of Medical Science, Soonchunhyang University, Asan, Republic of Korea
| | - Seungwon Myung
- Department of Medical Science, Soonchunhyang University, Asan, Republic of Korea
| | - Hyun-Soo Kim
- Department of Applied Research, National Marine Biodiversity Institute of Korea, Seochun, Republic of Korea
| | - Seung-Hong Lee
- Department of Medical Science, Soonchunhyang University, Asan, Republic of Korea
- Department of Pharmaceutical Engineering, Soonchunhyang University, Asan, Republic of Korea
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Ashourpour F, Jafari A, Babaei P. Chronic administration of Tat-GluR23Y ameliorates cognitive dysfunction targeting CREB signaling in rats with amyloid beta neurotoxicity. Metab Brain Dis 2021; 36:701-709. [PMID: 33420884 DOI: 10.1007/s11011-020-00662-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Accepted: 12/25/2020] [Indexed: 01/02/2023]
Abstract
Alzheimer's disease (AD) is behaviorally characterized by memory impairments, and pathologically by amyloid β1-42 (Aβ1-42) plaques and tangles. Aβ binds to excitatory synapses and disrupts their transmission due to dysregulation of the glutamate receptors. Here we hypothesized that chronic inhibition of the endocytosis of AMPA receptors together with GluN2B subunit of NMDA receptors might improve cognition deficit induced by Aβ(1-42) neurotoxicity. Forty male Wistar rats were used in this study and divided into 5 groups: Saline + Saline, Aβ+Saline, Aβ+Ifen (Ifenprodil, 3 nmol /2 weeks), Aβ+GluR23Y (Tat-GluR23Y 3 μmol/kg/2 weeks) and Aβ+Ifen+GluR23Y (same doses and durations). Aβ(1-42) neurotoxicity was induced by intracerebroventricular (ICV) injection of Aβ1-42 (2 μg/μl/side), and then animals received the related treatments for 14 days. Cognitive performance of rats and hippocampal level of cAMP-response element-binding (CREB) were evaluated using Morris Water Maze (MWM), and western blotting respectively. Obtained data from the acquisition trials were analyzed by two way Anova and Student T test. Also one way Analysis of variance (ANOVA) with post hoc Tuckey were used to clarify between groups differences in probe test. The Group receiving Aβ, showed significant cognition deficit (long latency to platform and short total time spent in target quadrant (TTS), parallel with lower level of hippocampal CREB, versus vehicle group. While, Aβ+ GluR23Y exhibited the shortest latency to platform and the longest TTS during the probe test, parallel with the higher hippocampal level of CREB compared with other groups. The present study provides evidence that chronic administration of Tat-GluR23Y; an inhibitor of GluA2-AMPARs endocytosis, successfully restores spatial memory impaired by amyloid beta neurotoxicity targeting CREB signaling pathway.
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Affiliation(s)
- Fatemeh Ashourpour
- Cellular & Molecular Research Center, School of Medicine, Guilan University of Medical Sciences, 8th Km of Rasht -Tehran road, Guilan University Complex, Rasht, Guilan, 41996-13769, Iran
- Neuroscience Research Center, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran
- Department of Physiology, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran
| | - Adele Jafari
- Department of Physiology, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran
| | - Parvin Babaei
- Cellular & Molecular Research Center, School of Medicine, Guilan University of Medical Sciences, 8th Km of Rasht -Tehran road, Guilan University Complex, Rasht, Guilan, 41996-13769, Iran.
- Neuroscience Research Center, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran.
- Department of Physiology, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran.
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Grigsby KB, Childs TE, Booth FW. The role of nucleus accumbens CREB attenuation in rescuing low voluntary running behavior in female rats. J Neurosci Res 2020; 98:2302-2316. [PMID: 32725625 DOI: 10.1002/jnr.24698] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 06/30/2020] [Accepted: 07/03/2020] [Indexed: 01/30/2023]
Abstract
Given the integral role of nucleus accumbens (NAc) cAMP response element binding protein (CREB) activity in motivational processes, the goal of the current study was to determine whether blunting chronic NAc CREB activity could rescue the low physical activity motivation of female, low voluntary running (LVR) rats. NAc CREB phosphorylation is elevated in these rats, a state previously attributed to deficits in reward valuation. It was recently shown that overexpression of the upstream CREB inhibitor, protein kinase inhibitor alpha (PKIα), increased LVR nightly running by ~threefold. Therefore, the current study addresses the extent to which NAc CREB attenuation influences female LVR and wild-type (WT) wheel-running behavior. Inducible reductions in NAc neuronal activity using Gi-coupled hM4Di DREADDs increased running behavior in LVR, but not in WT, rats. Similarly, site-directed pharmacological inhibition of NAc CREB activity significantly increased LVR nightly running distance and time by ~twofold, with no effect in WT rats. Finally, environmentally enriched LVR rats exhibit higher levels of running compared to socially isolated rats in what appeared to be a CREB-related manner. Considering the positive outcomes of upstream CREB modulation and environmental enrichment on LVR behavior, we believe that blunting NAc CREB activity has the neuromolecular potential to partially reverse low physical activity motivation, as exemplified by the LVR model. The positive physical activity outcome of early life enrichment adds translatable value to human childhood enrichment and highlights its importance on motivational processes later in life.
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Affiliation(s)
- Kolter B Grigsby
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, USA
| | - Thomas E Childs
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, USA
| | - Frank W Booth
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, USA
- Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, USA
- Department of Physiology, University of Missouri, Columbia, MO, USA
- Dalton Cardiovascular Center, University of Missouri, Columbia, MO, USA
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Wu D, Wu F, Lin R, Meng Y, Wei W, Sun Q, Jia L. Impairment of learning and memory induced by perinatal exposure to BPA is associated with ERα-mediated alterations of synaptic plasticity and PKC/ERK/CREB signaling pathway in offspring rats. Brain Res Bull 2020; 161:43-54. [PMID: 32380187 DOI: 10.1016/j.brainresbull.2020.04.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 04/17/2020] [Accepted: 04/27/2020] [Indexed: 12/18/2022]
Abstract
The effect of bisphenol A (BPA) on learning and memory has attracted much attention recently, but its underlying mechanism remains unclear. We aimed to investigate whether the impairment of learning and memory induced by perinatal exposure to BPA was associated with the hippocampal estrogen receptor α (ERα)-mediated synaptic plasticity and PKC/ERK/CREB signaling pathway in different sex offspring rats. Pregnant Sprague-Dawley rats were treated with BPA (1 and 10 μg/mL) through drinking water from gestational day (GD) 6 to postnatal day (PND) 21. After weaning, offspring drank BPA-free water until PND 56. Morris water maze, placement and object recognition, and step-down passive avoidance task were performed. The serum estradiol (E2) levels, histopathology of hippocampus, and the expression of learning and memory related proteins were measured. The results showed that spatial and recognition memory were impaired in BPA-exposed female and male offspring, but the impaired passive avoidance memory presented only in males, not in females. The serum E2 levels were increased in BPA-exposed females and males. BPA altered the morphology and quantity of hippocampal neurons. The levels of ERα, NMDA receptor subunit 2B (NR2B), p-NR2B, AMPA receptor 1 (GluA1), p-GluA1, PSD-95, synapsin I, PKC, p-ERK and p-CREB protein expression were decreased in BPA exposed females and males, and there were interactions of sex × BPA exposure in ERα, p-NR2B and p-ERK levels. These findings suggested that perinatal exposure to BPA has sex-specific effects on learning and memory, which is associated with ERα-mediated impairment of synaptic plasticity and down-regulation of PKC/ERK/CREB signaling pathway.
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Affiliation(s)
- Dan Wu
- Department of Child and Adolescent Health, School of Public Health, China Medical University, Shenyang 110122, China.
| | - Fengjuan Wu
- Department of Child and Adolescent Health, School of Public Health, China Medical University, Shenyang 110122, China.
| | - Ren Lin
- Department of Child and Adolescent Health, School of Public Health, China Medical University, Shenyang 110122, China.
| | - Yuan Meng
- Department of Child and Adolescent Health, School of Public Health, China Medical University, Shenyang 110122, China.
| | - Wei Wei
- Department of Child and Adolescent Health, School of Public Health, China Medical University, Shenyang 110122, China.
| | - Qi Sun
- Department of Child and Adolescent Health, School of Public Health, China Medical University, Shenyang 110122, China.
| | - Lihong Jia
- Department of Child and Adolescent Health, School of Public Health, China Medical University, Shenyang 110122, China.
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Xiong X, Lu W, Qin X, Luo Q, Zhou W. Downregulation of the GLP-1/CREB/adiponectin pathway is partially responsible for diabetes-induced dysregulated vascular tone and VSMC dysfunction. Biomed Pharmacother 2020; 127:110218. [PMID: 32559849 DOI: 10.1016/j.biopha.2020.110218] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Revised: 04/23/2020] [Accepted: 04/28/2020] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND The dysfunction of vasculature is observed in diabetes and might be responsible for the increased incidence of vascular events. Previous studies indicated that supplementation of GLP-1 analogues is beneficial to the cardiovascular functions in diabetic patients, but the mechanisms are not clear. METHODS A type 1 diabetic model was constructed. Vascular constrictions were measured using wire myograph. Western blotting and quantitative PCR were adopted to analyze the expression profiles of key molecules. Mitochondrial functions were analyzed in both vascular tissues or vascular smooth muscle cells (VSMCs). Dual-luciferase reporter assay was used to investigate the mechanism of adiponectin regulation. RESULTS In this study, abnormal vascular hypertrophy and increased vascular tones were observed in both diabetic patients and animals. ROS productions were increased in vessels and VSMCs from diabetic patients and animals, and the ROS scavenger mitoTEMPO partially attenuated the abnormal vascular tones and hypertension. In addition, decreased GLP-1 levels were observed, while GLP-1 supplementation improved the mitochondrial functions and vascular tones. Furthermore, it was shown that GLP-1 supplementation enhanced adiponectin expressions, while adiponectin facilitated the phosphorylation of AMPK and Sirt1 expressions. Also, CREB phosphorylation was enhanced upon GLP-1 supplementation and promoted the transcriptions of adiponectin. Finally, CREB inhibition partially attenuated the effects of GLP-1 on mitochondrial functions and adiponectin expressions. CONCLUSION GLP-1 downregulation might be an important mechanism of abnormal mitochondrial function and vascular tone in diabetes. Targeting GLP-1/CREB/adiponectin axis might become a promising therapeutic strategy in alleviating diabetes-related cardiovascular dysfunctions.
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Affiliation(s)
- Xiaowei Xiong
- Department of general surgery, the Third Affiliated Hospital of Nanchang University, Nanchang, 330008, China
| | - Weihang Lu
- Department of General surgery, the Sixth Medical Center, PLA General Hospital, Beijing, 100853, China
| | - Xuan Qin
- Department of general surgery, the Third Affiliated Hospital of Nanchang University, Nanchang, 330008, China
| | - Qingyu Luo
- Department of general surgery, the Third Affiliated Hospital of Nanchang University, Nanchang, 330008, China
| | - Weimin Zhou
- Department of vascular surgery, the Second Affiliated Hospital of Nanchang University, Nanchang, 330008, China.
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Abstract
The cyclic-AMP response element binding protein (CREB) is an important nuclear transcription factor and has been shown to be overexpressed and/or over-activated in many different cancer types, suggesting that targeting CREB is a novel approach for developing cancer therapies. Our lab discovered the first cell-permeable small molecule inhibitor of CREB, from which we further developed a potent CREB inhibitor with in vivo anti-cancer activity. In this article, we detailed our biochemical and cell-based bioassays to assess different small molecule CREB inhibitors.
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Affiliation(s)
- Bingbing X Li
- Program in Chemical Biology, Department of Chemical Physiology and Biochemistry, Knight Cancer Institute, Oregon Health and Science University, Portland, OR, United States.
| | - Xiangshu Xiao
- Program in Chemical Biology, Department of Chemical Physiology and Biochemistry, Knight Cancer Institute, Oregon Health and Science University, Portland, OR, United States.
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Pagliaroli L, Widomska J, Nespoli E, Hildebrandt T, Barta C, Glennon J, Hengerer B, Poelmans G. Riluzole Attenuates L-DOPA-Induced Abnormal Involuntary Movements Through Decreasing CREB1 Activity: Insights from a Rat Model. Mol Neurobiol 2019; 56:5111-5121. [PMID: 30484112 PMCID: PMC6647536 DOI: 10.1007/s12035-018-1433-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 11/15/2018] [Indexed: 12/17/2022]
Abstract
Chronic administration of L-DOPA, the first-line treatment of dystonic symptoms in childhood or in Parkinson's disease, often leads to the development of abnormal involuntary movements (AIMs), which represent an important clinical problem. Although it is known that Riluzole attenuates L-DOPA-induced AIMs, the molecular mechanisms underlying this effect are not understood. Therefore, we studied the behavior and performed RNA sequencing of the striatum in three groups of rats that all received a unilateral lesion with 6-hydroxydopamine in their medial forebrain bundle, followed by the administration of saline, L-DOPA, or L-DOPA combined with Riluzole. First, we provide evidence that Riluzole attenuates AIMs in this rat model. Subsequently, analysis of the transcriptomics data revealed that Riluzole is predicted to reduce the activity of CREB1, a transcription factor that regulates the expression of multiple proteins that interact in a molecular landscape involved in apoptosis. Although this mechanism underlying the beneficial effect of Riluzole on AIMs needs to be confirmed, it provides clues towards novel or existing compounds for the treatment of AIMs that modulate the activity of CREB1 and, hence, its downstream targets.
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Affiliation(s)
- Luca Pagliaroli
- Institute of Medical Chemistry, Molecular Biology and Pathobiochemistry, Semmelweis University, Budapest, Hungary
| | - Joanna Widomska
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Ester Nespoli
- CNS Department, Boehringer Ingelheim Pharma GmbH & Co. KG, Biberach an der Riss, Germany
- Department of Child and Adolescent Psychiatry/Psychotherapy, University of Ulm, Ulm, Germany
| | - Tobias Hildebrandt
- Target Discovery, Boehringer Ingelheim Pharma GmbH & Co. KG, Biberach an der Riss, Germany
| | - Csaba Barta
- Institute of Medical Chemistry, Molecular Biology and Pathobiochemistry, Semmelweis University, Budapest, Hungary
| | - Jeffrey Glennon
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Bastian Hengerer
- CNS Department, Boehringer Ingelheim Pharma GmbH & Co. KG, Biberach an der Riss, Germany
| | - Geert Poelmans
- Department of Human Genetics, Radboud University Medical Center, PO Box 9101, 6500 HB, Nijmegen, The Netherlands.
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Liu B, Zhang R, Wei S, Yuan Q, Xue M, Hao P, Xu F, Wang J, Chen Y. ALDH2 protects against alcoholic cardiomyopathy through a mechanism involving the p38 MAPK/CREB pathway and local renin-angiotensin system inhibition in cardiomyocytes. Int J Cardiol 2018; 257:150-159. [PMID: 29506687 DOI: 10.1016/j.ijcard.2017.11.094] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2017] [Accepted: 11/27/2017] [Indexed: 12/20/2022]
Abstract
BACKGROUND Angiotensin II (Ang II) in the local cardiac renin-angiotensin system (RAS) is closely associated with alcoholic cardiomyopathy (ACM). Inhibition of local cardiac RAS has great significance in the treatment of ACM. Although aldehyde dehydrogenase 2 (ALDH2) has been demonstrated to protect against ACM through detoxification of aldehydes, the precise mechanisms are largely unknown. In the present study, we determined whether ALDH2 improved cardiac damage by inhibiting the local RAS in ACM and investigated the related regulatory mechanisms. METHODS AND RESULTS Adult male mice were fed with 5% ethanol or a control diet for 2months, with or without the ALDH2 activator Alda-1. Heavy ethanol consumption induced cardiac damage, increased angiotensinogen (AGT) and Ang II and decreased myocardial ALDH2 activity in hearts. ALDH2 activation improved ethanol-induced cardiac damage and decreased AGT and Ang II in hearts. In vitro, ALDH2 activation or overexpression decreased AGT and Ang II in cultured cardiomyocytes treated with 400mmol/L ethanol for 24h. Furthermore, p38 MAP kinase (p38 MAPK)/cyclic adenosine monophosphate response element-binding protein (CREB) pathway activation by ethanol increased AGT and Ang II in cardiomyocytes. In addition, ALDH2 activation or overexpression inhibited the p38 MAPK/CREB pathway leading to decreased AGT and Ang II in cardiomyocytes. We also found that p38 MAPK activation effectively mitigated Alda-1-decreased AGT and Ang II, the effect of which was reversed by inhibition of CREB. CONCLUSIONS ALDH2 decreased AGT and Ang II in the local cardiac RAS via inhibiting the p38 MAPK/CREB pathway in ACM, thus improving ethanol-induced cardiac damage.
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MESH Headings
- Adenoviridae/genetics
- Aldehyde Dehydrogenase, Mitochondrial/administration & dosage
- Aldehyde Dehydrogenase, Mitochondrial/genetics
- Aldehyde Dehydrogenase, Mitochondrial/metabolism
- Angiotensin II/metabolism
- Angiotensinogen/antagonists & inhibitors
- Angiotensinogen/metabolism
- Animals
- Animals, Newborn
- Cardiomyopathy, Alcoholic/metabolism
- Cardiomyopathy, Alcoholic/prevention & control
- Cardiotonic Agents/administration & dosage
- Cardiotonic Agents/metabolism
- Cells, Cultured
- Cyclic AMP Response Element-Binding Protein/antagonists & inhibitors
- Cyclic AMP Response Element-Binding Protein/metabolism
- Genetic Vectors/administration & dosage
- Genetic Vectors/genetics
- MAP Kinase Signaling System/drug effects
- MAP Kinase Signaling System/physiology
- Male
- Mice
- Mice, Inbred C57BL
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/metabolism
- Rats
- Rats, Wistar
- Renin-Angiotensin System/drug effects
- Renin-Angiotensin System/physiology
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Affiliation(s)
- Baoshan Liu
- Department of Emergency, Qilu Hospital, Shandong University, Jinan, China; Chest Pain Center, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Qilu Hospital, Shandong University, Jinan, China; Institute of Emergency and Critical Care Medicine, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Cardiovascular Remodeling & Function Research, Chinese Ministry of Education & Chinese Ministry of Public Health, Qilu Hospital, Shandong University, Jinan, China
| | - Rui Zhang
- Department of Emergency, Qilu Hospital, Shandong University, Jinan, China; Chest Pain Center, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Qilu Hospital, Shandong University, Jinan, China; Institute of Emergency and Critical Care Medicine, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Cardiovascular Remodeling & Function Research, Chinese Ministry of Education & Chinese Ministry of Public Health, Qilu Hospital, Shandong University, Jinan, China
| | - Shujian Wei
- Department of Emergency, Qilu Hospital, Shandong University, Jinan, China; Chest Pain Center, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Qilu Hospital, Shandong University, Jinan, China; Institute of Emergency and Critical Care Medicine, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Cardiovascular Remodeling & Function Research, Chinese Ministry of Education & Chinese Ministry of Public Health, Qilu Hospital, Shandong University, Jinan, China
| | - Qiuhuan Yuan
- Department of Emergency, Qilu Hospital, Shandong University, Jinan, China; Chest Pain Center, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Qilu Hospital, Shandong University, Jinan, China; Institute of Emergency and Critical Care Medicine, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Cardiovascular Remodeling & Function Research, Chinese Ministry of Education & Chinese Ministry of Public Health, Qilu Hospital, Shandong University, Jinan, China
| | - Mengyang Xue
- Department of Emergency, Qilu Hospital, Shandong University, Jinan, China; Chest Pain Center, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Qilu Hospital, Shandong University, Jinan, China; Institute of Emergency and Critical Care Medicine, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Cardiovascular Remodeling & Function Research, Chinese Ministry of Education & Chinese Ministry of Public Health, Qilu Hospital, Shandong University, Jinan, China
| | - Panpan Hao
- Key Laboratory of Cardiovascular Remodeling & Function Research, Chinese Ministry of Education & Chinese Ministry of Public Health, Qilu Hospital, Shandong University, Jinan, China
| | - Feng Xu
- Department of Emergency, Qilu Hospital, Shandong University, Jinan, China; Chest Pain Center, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Qilu Hospital, Shandong University, Jinan, China; Institute of Emergency and Critical Care Medicine, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Cardiovascular Remodeling & Function Research, Chinese Ministry of Education & Chinese Ministry of Public Health, Qilu Hospital, Shandong University, Jinan, China
| | - Jiali Wang
- Department of Emergency, Qilu Hospital, Shandong University, Jinan, China; Chest Pain Center, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Qilu Hospital, Shandong University, Jinan, China; Institute of Emergency and Critical Care Medicine, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Cardiovascular Remodeling & Function Research, Chinese Ministry of Education & Chinese Ministry of Public Health, Qilu Hospital, Shandong University, Jinan, China.
| | - Yuguo Chen
- Department of Emergency, Qilu Hospital, Shandong University, Jinan, China; Chest Pain Center, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Emergency and Critical Care Medicine of Shandong Province, Qilu Hospital, Shandong University, Jinan, China; Institute of Emergency and Critical Care Medicine, Qilu Hospital, Shandong University, Jinan, China; Key Laboratory of Cardiovascular Remodeling & Function Research, Chinese Ministry of Education & Chinese Ministry of Public Health, Qilu Hospital, Shandong University, Jinan, China.
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13
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Srivastava P, Dhuriya YK, Kumar V, Srivastava A, Gupta R, Shukla RK, Yadav RS, Dwivedi HN, Pant AB, Khanna VK. PI3K/Akt/GSK3β induced CREB activation ameliorates arsenic mediated alterations in NMDA receptors and associated signaling in rat hippocampus: Neuroprotective role of curcumin. Neurotoxicology 2018; 67:190-205. [PMID: 29723552 DOI: 10.1016/j.neuro.2018.04.018] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 04/26/2018] [Accepted: 04/29/2018] [Indexed: 12/20/2022]
Abstract
Protective efficacy of curcumin in arsenic induced NMDA receptor dysfunctions and PI3K/Akt/ GSK3β signalling in hippocampus has been investigated in vivo and in vitro. Exposure to sodium arsenite (in vivo - 20 mg/kg, body weight p.o. for 28 days; in vitro - 10 μM for 24 h) and curcumin (in vivo - 100 mg/kg body weight p.o. for 28 days; in vitro - 20 μM for 24 h) was carried out alone or simultaneously. Treatment with curcumin ameliorated sodium arsenite induced alterations in the levels of NMDA receptors, its receptor subunits and synaptic proteins - pCaMKIIα, PSD-95 and SynGAP both in vivo and in vitro. Decreased levels of BDNF, pAkt, pERK1/2, pGSK3β and pCREB on sodium arsenite exposure were also protected by curcumin. Curcumin was found to decrease sodium arsenite induced changes in hippocampus by modulating PI3K/Akt/GSK3β neuronal survival pathway, known to regulate various cellular events. Treatment of hippocampal cultures with pharmacological inhibitors for ERK1/2, GSK3β and Akt individually inhibited levels of CREB and proteins associated with PI3K/Akt/GSK3β pathway. Simultaneous treatment with curcumin was found to improve sodium arsenite induced learning and memory deficits in rats assessed by water maze and Y-maze. The results provide evidence that curcumin exercises its neuroprotective effect involving PI3K/Akt pathway which may affect NMDA receptors and downstream signalling through TrKβ and BDNF in arsenic induced cognitive deficits in hippocampus.
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Affiliation(s)
- Pranay Srivastava
- Developmental Toxicology and NeuroToxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow, 226 001, UP, India; School of Pharmacy, Babu Banarsi Das University, Faizabad Road, Lucknow, 226 028, UP, India
| | - Yogesh K Dhuriya
- Developmental Toxicology and NeuroToxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow, 226 001, UP, India
| | - Vivek Kumar
- Human Genome and Stem-Cell Research Center, Institute of Biosciences, University of São Paulo, Brazil
| | - Akriti Srivastava
- Developmental Toxicology and NeuroToxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow, 226 001, UP, India
| | - Richa Gupta
- Developmental Toxicology and NeuroToxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow, 226 001, UP, India; School of Pharmacy, Babu Banarsi Das University, Faizabad Road, Lucknow, 226 028, UP, India
| | - Rajendra K Shukla
- Developmental Toxicology and NeuroToxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow, 226 001, UP, India
| | - Rajesh S Yadav
- Department of Criminology and Forensic Science, Dr. Harisingh Gour Central University, Sagar, 470003, MP, India
| | - Hari N Dwivedi
- School of Pharmacy, Babu Banarsi Das University, Faizabad Road, Lucknow, 226 028, UP, India
| | - Aditya B Pant
- Developmental Toxicology and NeuroToxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow, 226 001, UP, India.
| | - Vinay K Khanna
- Developmental Toxicology and NeuroToxicology Laboratory, Systems Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow, 226 001, UP, India.
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14
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Wu X, Liang Y, Jing X, Lin D, Chen Y, Zhou T, Peng S, Zheng D, Zeng Z, Lei M, Huang K, Tao E. Rifampicin Prevents SH-SY5Y Cells from Rotenone-Induced Apoptosis via the PI3K/Akt/GSK-3β/CREB Signaling Pathway. Neurochem Res 2018; 43:886-893. [PMID: 29435803 DOI: 10.1007/s11064-018-2494-y] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 01/28/2018] [Accepted: 02/02/2018] [Indexed: 12/23/2022]
Abstract
In addition to its original application for treating tuberculosis, rifampicin has multiple potential neuroprotective effects in chronic neurodegenerative diseases including Parkinson's disease (PD) and Alzheimer's disease. Inflammatory reactions and the PI3K/Akt pathway are strongly implicated in dopaminergic neuronal death in PD. This study aims to investigate whether rifampicin protects rotenone-lesioned SH-SY5Y cells via regulating PI3K/Akt/GSK-3β/CREB pathway. Rotenone-treated SH-SY5Y cells were used as the cell model to investigate the neuroprotective effects of rifampicin. Cell viability and apoptosis of SH-SY5Y cells were determined by CCK-8 assay and flow cytometry, respectively. The expression of Akt, p-Akt, GSK-3β, p-GSK-3β, CREB and p-CREB were measured by Western blot. Our results showed that the cell viability and level of phospho-CREB significantly decreased in SH-SY5Y cells exposed to rotenone when compared to the control group. Both the cell viability and the expression of phospho-CREB in cells pretreated with rifampicin were higher than those of cells exposed to rotenone alone. Moreover, pretreatment of SH-SY5Y cells with rifampicin enhanced phosphorylation of Akt and suppressed activity of GSK-3β. The addition of LY294002, a PI3K inhibitor, could suppress phosphorylation of Akt and CREB and activate GSK-3β, resulting in abolishment of neuroprotective effects of rifampicin on cells exposed to rotenone. Rifampicin provides neuroprotection against dopaminergic degeneration, partially via the PI3K/Akt/GSK-3β/CREB signaling pathway. These findings suggest that rifampicin could be an effective and promising neuroprotective candidate for treating PD.
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Affiliation(s)
- Xia Wu
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, No. 107 Yanjiang West Road, Guangzhou, 510080, Guangdong, China
- Department of Neurology, Shenzhen Nanshan District Xili People's Hospital, No. 2051 Xili Liuxian Avenue, Shenzhen, 518055, China
| | - Yanran Liang
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, No. 107 Yanjiang West Road, Guangzhou, 510080, Guangdong, China
| | - Xiuna Jing
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, No. 107 Yanjiang West Road, Guangzhou, 510080, Guangdong, China
| | - Danyu Lin
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, No. 107 Yanjiang West Road, Guangzhou, 510080, Guangdong, China
| | - Ying Chen
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, No. 107 Yanjiang West Road, Guangzhou, 510080, Guangdong, China
| | - Tianen Zhou
- Department of Emergency, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, No. 107 Yanjiang West Road, Guangzhou, 510080, China
| | - Sudan Peng
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, No. 107 Yanjiang West Road, Guangzhou, 510080, Guangdong, China
| | - Dezhi Zheng
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, No. 107 Yanjiang West Road, Guangzhou, 510080, Guangdong, China
| | - Zhifen Zeng
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, No. 107 Yanjiang West Road, Guangzhou, 510080, Guangdong, China
| | - Ming Lei
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, No. 107 Yanjiang West Road, Guangzhou, 510080, Guangdong, China
| | - Kaixun Huang
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, No. 107 Yanjiang West Road, Guangzhou, 510080, Guangdong, China
| | - Enxiang Tao
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, No. 107 Yanjiang West Road, Guangzhou, 510080, Guangdong, China.
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15
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Abstract
Cancer stem cells (CSCs), including leukemia stem cells (LSCs), exhibit self-renewal capacity and differentiation potential and have the capacity to maintain or renew and propagate a tumor/leukemia. The initial isolation of CSCs/LSCs was in adult myelogenous leukemia, although more recently, the existence of CSCs in a wide variety of other cancers has been reported. CSCs, in general, and LSCs, specifically with respect to this review, are responsible for initiation of disease, therapeutic resistance and ultimately disease relapse. One key focus in cancer research over the past decade has been the development of therapies that safely eliminate the LSC/CSC population. One major obstacle to this goal is the identification of key mechanisms that distinguish LSCs from normal endogenous hematopoietic stem cells. An additional daunting feature that has recently come to light with advances in next-generation sequencing and single-cell sequencing is the heterogeneity within leukemias/tumors, with multiple combinations of mutations, gain and loss of function of genes, and so on being capable of driving disease, even within the CSC/LSC population. The focus of this review/perspective is on our work in identifying and validating, in both chronic myelogenous leukemia and acute lymphoblastic leukemia, a safe and efficacious mechanism to target an evolutionarily conserved signaling nexus, which constitutes a common "Achilles heel" for LSCs/CSCs, using small molecule-specific CBP/catenin antagonists.
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Affiliation(s)
- Yong-Mi Kim
- Children's Hospital Los Angeles, Department of Pediatrics, Division of Blood and Bone Marrow Transplantation, University of Southern California, Los Angeles, CA
| | - Eun-Ji Gang
- Children's Hospital Los Angeles, Department of Pediatrics, Division of Blood and Bone Marrow Transplantation, University of Southern California, Los Angeles, CA
| | - Michael Kahn
- Department of Biochemistry and Molecular Biology, Keck School of Medicine, University of Southern California, Los Angeles, CA; Department of Molecular Pharmacology and Toxicology, University of Southern California, Los Angeles, CA; Center for Molecular Pathways and Drug Discovery, University of Southern California, Los Angeles, CA; Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA.
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16
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Xie F, Li BX, Xiao X. Design, synthesis and biological evaluation of regioisomers of 666-15 as inhibitors of CREB-mediated gene transcription. Bioorg Med Chem Lett 2017; 27:994-998. [PMID: 28073675 PMCID: PMC5296214 DOI: 10.1016/j.bmcl.2016.12.078] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 12/28/2016] [Accepted: 12/28/2016] [Indexed: 11/19/2022]
Abstract
cAMP-response element binding protein (CREB) is a nuclear transcription factor that has been implicated in the pathogenesis and maintenance of various types of human cancers. Identification of small molecule inhibitors of CREB-mediated gene transcription has been pursued as a novel strategy for developing cancer therapeutics. We recently discovered a potent and cell-permeable CREB inhibitor called 666-15. 666-15 is a bisnaphthamide and has been shown to possess efficacious anti-breast cancer activity without toxicity in vivo. In this study, we designed and synthesized a series of analogs of 666-15 to probe the importance of regiochemistry in naphthalene ring B. Biological evaluations of these analogs demonstrated that the substitution pattern of the alkoxy and carboxamide in naphthalene ring B is very critical for maintaining potent CREB inhibition activity, suggesting that the unique bioactive conformation accessible in 666-15 is critically important.
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Affiliation(s)
- Fuchun Xie
- Program in Chemical Biology, Department of Physiology and Pharmacology, Oregon Health & Science University, 3181 SW Sam Jackson Park Rd, Portland, OR 97239, USA
| | - Bingbing X Li
- Program in Chemical Biology, Department of Physiology and Pharmacology, Oregon Health & Science University, 3181 SW Sam Jackson Park Rd, Portland, OR 97239, USA
| | - Xiangshu Xiao
- Program in Chemical Biology, Department of Physiology and Pharmacology, Oregon Health & Science University, 3181 SW Sam Jackson Park Rd, Portland, OR 97239, USA; Knight Cancer Institute, Oregon Health & Science University, 3181 SW Sam Jackson Park Rd, Portland, OR 97239, USA; Knight Cardiovascular Institute, Oregon Health & Science University, 3181 SW Sam Jackson Park Rd, Portland, OR 97239, USA.
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17
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Harada N, Ishihara M, Horiuchi H, Ito Y, Tabata H, Suzuki YA, Nakano Y, Yamaji R, Inui H. Mogrol Derived from Siraitia grosvenorii Mogrosides Suppresses 3T3-L1 Adipocyte Differentiation by Reducing cAMP-Response Element-Binding Protein Phosphorylation and Increasing AMP-Activated Protein Kinase Phosphorylation. PLoS One 2016; 11:e0162252. [PMID: 27583359 PMCID: PMC5008739 DOI: 10.1371/journal.pone.0162252] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 08/21/2016] [Indexed: 12/03/2022] Open
Abstract
This study investigated the effects of mogrol, an aglycone of mogrosides from Siraitia grosvenorii, on adipogenesis in 3T3-L1 preadipocytes. Mogrol, but not mogrosides, suppressed triglyceride accumulation by affecting early (days 0–2) and late (days 4–8), but not middle (days 2–4), differentiation stages. At the late stage, mogrol increased AMP-activated protein kinase (AMPK) phosphorylation and reduced glycerol-3-phosphate dehydrogenase activity. At the early stage, mogrol promoted AMPK phosphorylation, inhibited the induction of CCAAT/enhancer-binding protein β (C/EBPβ; a master regulator of adipogenesis), and reduced 3T3-L1 cell contents (e.g., clonal expansion). In addition, mogrol, but not the AMPK activator AICAR, suppressed the phosphorylation and activity of the cAMP response element-binding protein (CREB), which regulates C/EBPβ expression. These results indicated that mogrol suppressed adipogenesis by reducing CREB activation in the initial stage of cell differentiation and by activating AMPK signaling in both the early and late stages of this process.
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Affiliation(s)
- Naoki Harada
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan
- * E-mail: (NH); (HI)
| | - Mikako Ishihara
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan
| | - Hiroko Horiuchi
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan
| | - Yuta Ito
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan
- Biochemical Laboratory, Saraya Company, Ltd., Kashiwara, Osaka, Japan
| | - Hiromitsu Tabata
- Biochemical Laboratory, Saraya Company, Ltd., Kashiwara, Osaka, Japan
| | - Yasushi A. Suzuki
- Biochemical Laboratory, Saraya Company, Ltd., Kashiwara, Osaka, Japan
| | - Yoshihisa Nakano
- Center for Research and Development of Bioresources, Osaka Prefecture University, Sakai, Osaka, Japan
| | - Ryoichi Yamaji
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan
| | - Hiroshi Inui
- Center for Research and Development of Bioresources, Osaka Prefecture University, Sakai, Osaka, Japan
- Department of Nutrition, Osaka Prefecture University, Habikino, Osaka, Japan
- * E-mail: (NH); (HI)
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18
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Song RB, Lou WH. Monosialotetrahexosylganglioside Inhibits the Expression of p-CREB and NR2B in the Auditory Cortex in Rats with Salicylate-Induced Tinnitus. Clin Lab 2015; 61:1113-8. [PMID: 26554229 DOI: 10.7754/clin.lab.2015.150212] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND This study investigated the effects of monosialotetrahexosylganglioside (GM1) on the expression of N-methyl-D-aspartate receptor subunit 2B (NR2B) and phosphorylated (p)-cyclic AMP response element-binding protein (CREB) in the auditory cortex of rats with tinnitus. METHODS Tinnitus-like behavior in rats was tested with the gap prepulse inhibition of acoustic startle paradigm. We then investigated the NR2B mRNA and protein and p-CREB protein levels in the auditory cortex of tinnitus rats compared with normal rats. RESULTS Rats treated for 4 days with salicylate exhibited tinnitus. NR2B mRNA and protein and p-CREB protein levels were upregulated in these animals, with expression returning to normal levels 14 days after cessation of treatment; baseline levels of NR2B and p-CREB were also restored by GM1 administration. CONCLUSIONS These data suggest that chronic salicylate administration induces tinnitus via upregulation of p-CREB and NR2B expression, and that GM1 can potentially be used to treat tinnitus.
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Lee JW, Park HS, Park SA, Ryu SH, Meng W, Jürgensmeier JM, Kurie JM, Hong WK, Boyer JL, Herbst RS, Koo JS. A Novel Small-Molecule Inhibitor Targeting CREB-CBP Complex Possesses Anti-Cancer Effects along with Cell Cycle Regulation, Autophagy Suppression and Endoplasmic Reticulum Stress. PLoS One 2015; 10:e0122628. [PMID: 25897662 PMCID: PMC4405579 DOI: 10.1371/journal.pone.0122628] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 02/23/2015] [Indexed: 12/19/2022] Open
Abstract
Lung adenocarcinoma, the most common subtype of lung cancer, is the leading cause of cancer death worldwide. Despite attempts for the treatment of lung cancer which have been accumulating, promising new therapies are still needed. Here, we found that cyclic-AMP response element-binding protein (CREB)-CREB binding protein (CBP) transcription factors complex inhibitor, Naphthol AS-TR phosphate (NASTRp), is a potential therapeutic agent for lung cancer. We show that NASTRp inhibited oncogenic cell properties through cell cycle arrest with concomitant suppression of tumor-promoting autophagy with down-regulations of Atg5-12 and Atg7, and accumulation of p62 in human lung cancer cell lines. In addition, NASTRp induced expression of endoplasmic reticulum stress markers such as DDIT3/CHOP, and led to apoptosis along with Bim induction. These findings suggest that transcription factor/co-activator complex, CREB-CBP, can be a potential therapeutic target and its inhibition could be a novel therapeutic strategy for lung cancer.
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Affiliation(s)
- Jong Woo Lee
- Section of Medical Oncology, Department of Internal Medicine, Yale Comprehensive Cancer Center, Yale School of Medicine, Yale University, New Haven, CT 06520, United States of America
| | - Hee Sun Park
- Section of Medical Oncology, Department of Internal Medicine, Yale Comprehensive Cancer Center, Yale School of Medicine, Yale University, New Haven, CT 06520, United States of America
| | - Sin-Aye Park
- Section of Medical Oncology, Department of Internal Medicine, Yale Comprehensive Cancer Center, Yale School of Medicine, Yale University, New Haven, CT 06520, United States of America
| | - Seung-Hee Ryu
- Department of Radiation Oncology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea
| | - Wuyi Meng
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, United States of America
| | - Juliane M. Jürgensmeier
- Section of Medical Oncology, Department of Internal Medicine, Yale Comprehensive Cancer Center, Yale School of Medicine, Yale University, New Haven, CT 06520, United States of America
| | - Jonathan M. Kurie
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, United States of America
| | - Waun Ki Hong
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, United States of America
| | - Julie L. Boyer
- Section of Medical Oncology, Department of Internal Medicine, Yale Comprehensive Cancer Center, Yale School of Medicine, Yale University, New Haven, CT 06520, United States of America
| | - Roy S. Herbst
- Section of Medical Oncology, Department of Internal Medicine, Yale Comprehensive Cancer Center, Yale School of Medicine, Yale University, New Haven, CT 06520, United States of America
- Translational Research Program, Yale Comprehensive Cancer Center, New Haven, CT 06520, United States of America
| | - Ja Seok Koo
- Section of Medical Oncology, Department of Internal Medicine, Yale Comprehensive Cancer Center, Yale School of Medicine, Yale University, New Haven, CT 06520, United States of America
- Translational Research Program, Yale Comprehensive Cancer Center, New Haven, CT 06520, United States of America
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Winiarska K, Jarzyna R, Dzik JM, Jagielski AK, Grabowski M, Nowosielska A, Focht D, Sierakowski B. ERK1/2 pathway is involved in renal gluconeogenesis inhibition under conditions of lowered NADPH oxidase activity. Free Radic Biol Med 2015; 81:13-21. [PMID: 25601753 DOI: 10.1016/j.freeradbiomed.2014.12.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 11/27/2014] [Accepted: 12/26/2014] [Indexed: 01/11/2023]
Abstract
The aim of this study was to elucidate the mechanisms involved in the inhibition of renal gluconeogenesis occurring under conditions of lowered activity of NADPH oxidase (Nox), the enzyme considered to be one of the main sources of reactive oxygen species in kidneys. The in vitro experiments were performed on primary cultures of rat renal proximal tubules, with the use of apocynin, a selective Nox inhibitor, and TEMPOL (4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl), a potent superoxide radical scavenger. In the in vivo experiments, Zucker diabetic fatty (ZDF) rats, a well established model of diabetes type 2, were treated with apocynin solution in drinking water. The main in vitro findings are the following: (1) both apocynin and TEMPOL attenuate the rate of gluconeogenesis, inhibiting the step catalyzed by phosphoenolpyruvate carboxykinase (PEPCK), a key enzyme of the process; (2) in the presence of the above-noted compounds the expression of PEPCK and the phosphorylation of transcription factor CREB and ERK1/2 kinases are lowered; (3) both U0126 (MEK inhibitor) and 3-(2-aminoethyl)-5-((4-ethoxyphenyl)methylene)-2,4-thiazolidinedione (ERK inhibitor) diminish the rate of glucose synthesis via mechanisms similar to those of apocynin and TEMPOL. The observed apocynin in vivo effects include: (1) slight attenuation of hyperglycemia; (2) inhibition of renal gluconeogenesis; (3) a decrease in renal PEPCK activity and content. In view of the results summarized above, it can be concluded that: (1) the lowered activity of the ERK1/2 pathway is of importance for the inhibition of renal gluconeogenesis found under conditions of lowered superoxide radical production by Nox; (2) the mechanism of this phenomenon includes decreased PEPCK expression, resulting from diminished activity of transcription factor CREB; (3) apocynin-evoked inhibition of renal gluconeogenesis contributes to the hypoglycemic action of this compound observed in diabetic animals. Thus, the study has delivered some new insights into the recently discussed issue of the usefulness of Nox inhibition as a potential antidiabetic strategy.
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Affiliation(s)
- Katarzyna Winiarska
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland.
| | - Robert Jarzyna
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland
| | - Jolanta M Dzik
- Department of Biochemistry, Faculty of Agriculture and Biology, Warsaw University of Life Sciences-SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland
| | - Adam K Jagielski
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland
| | - Michal Grabowski
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland
| | - Agata Nowosielska
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland
| | - Dorota Focht
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland
| | - Bartosz Sierakowski
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland
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Blanchet E, Van de Velde S, Matsumura S, Hao E, LeLay J, Kaestner K, Montminy M. Feedback inhibition of CREB signaling promotes beta cell dysfunction in insulin resistance. Cell Rep 2015; 10:1149-57. [PMID: 25704817 DOI: 10.1016/j.celrep.2015.01.046] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Revised: 12/24/2014] [Accepted: 01/17/2015] [Indexed: 01/04/2023] Open
Abstract
Although persistent elevations in circulating glucose concentrations promote compensatory increases in pancreatic islet mass, unremitting insulin resistance causes deterioration in beta cell function that leads to the progression to diabetes. Here, we show that mice with a knockout of the CREB coactivator CRTC2 in beta cells have impaired oral glucose tolerance due to decreases in circulating insulin concentrations. CRTC2 was found to promote beta cell function in part by stimulating the expression of the transcription factor MafA. Chronic hyperglycemia disrupted cAMP signaling in pancreatic islets by activating the hypoxia inducible factor (HIF1)-dependent induction of the protein kinase A inhibitor beta (PKIB), a potent inhibitor of PKA catalytic activity. Indeed, disruption of the PKIB gene improved islet function in the setting of obesity. These results demonstrate how crosstalk between nutrient and hormonal pathways contributes to loss of pancreatic islet function.
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Affiliation(s)
- Emilie Blanchet
- Peptide Biology Laboratories, Salk Institute, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Sam Van de Velde
- Peptide Biology Laboratories, Salk Institute, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Shigenobu Matsumura
- Peptide Biology Laboratories, Salk Institute, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Ergeng Hao
- Peptide Biology Laboratories, Salk Institute, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - John LeLay
- Peptide Biology Laboratories, Salk Institute, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA; Department of Genetics, Institute for Diabetes, Obesity and Metabolism, University of Pennsylvania School of Medicine, 3400 Civic Center Boulevard, Philadelphia, PA 19104-5156, USA
| | - Klaus Kaestner
- Peptide Biology Laboratories, Salk Institute, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA; Department of Genetics, Institute for Diabetes, Obesity and Metabolism, University of Pennsylvania School of Medicine, 3400 Civic Center Boulevard, Philadelphia, PA 19104-5156, USA
| | - Marc Montminy
- Peptide Biology Laboratories, Salk Institute, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
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Wang B, Zhu L, Sui S, Sun C, Jiang H, Ren D. Cilostazol induces mitochondrial fatty acid β-oxidation in C2C12 myotubes. Biochem Biophys Res Commun 2014; 447:441-5. [PMID: 24732360 DOI: 10.1016/j.bbrc.2014.04.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2014] [Accepted: 04/04/2014] [Indexed: 11/19/2022]
Abstract
Cilostazol is a drug licensed for the treatment of intermittent claudication. Its main action is to elevate intracellular levels of cyclic monophosphate (cAMP) by inhibiting the activity of type III phosphodiesterase, a cAMP-degrading enzyme. The effects of cilostazol on fatty acid oxidation (FAO) are as yet unknown. In this study, we report that cilostazol can elevate complete FAO and decrease both triacylglycerol (TAG) accumulation and TAG secretion. This use of cilostazol treatment increases expression of PGC-1α and, subsequently, its target genes, such as ERRα, NOR1, CD36, CPT1, MCAD, and ACO. Expression of these factors is linked to fatty acid β-oxidation but this effect is inhibited by H-89, a specific inhibitor of the PKA/CREB pathway. Importantly, knockdown of PGC-1α using siRNA abolished the effects of cilostazol in fatty acid oxidation (FAO) and TAG metabolism. These findings suggested that the PKA/CREB/PGC-1α pathway plays a critical role in cilostazol-induced fatty acid oxidation and TAG metabolism.
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Affiliation(s)
- Bo Wang
- Department of Internal Medicine, South Branch of Yantaishan Hospital, Yantai 264025, Shandong Province, China.
| | - Liping Zhu
- Department of Endocrinology, Zhucheng City People's Hospital, Zhucheng 262200, Shandong Province, China
| | - Shaohua Sui
- Department of Endocrinology, YanTai Development Zone Hospital, Yantai 264004, Shandong Province, China
| | - Caixia Sun
- Department of Endocrinology, Yantaishan Hospital, Yantai 264025, Shandong Province, China
| | - Haiping Jiang
- Department of Internal Medicine, South Branch of Yantaishan Hospital, Yantai 264025, Shandong Province, China
| | - Donghui Ren
- Department of Internal Medicine, South Branch of Yantaishan Hospital, Yantai 264025, Shandong Province, China
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Ha H, Shim KS, Kim T, An H, Lee CJ, Lee KJ, Ma JY. Water extract of Acer tegmentosum reduces bone destruction by inhibiting osteoclast differentiation and function. Molecules 2014; 19:3940-54. [PMID: 24694651 PMCID: PMC6271087 DOI: 10.3390/molecules19043940] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 03/24/2014] [Accepted: 03/25/2014] [Indexed: 12/25/2022] Open
Abstract
The stem of Acer tegmentosum has been widely used in Korea for the treatment of hepatic disorders. In this study, we investigated the bone protective effect of water extract of the stem of Acer tegmentosum (WEAT). We found that WEAT inhibits osteoclast differentiation induced by receptor activator of nuclear factor-κB ligand (RANKL), an essential cytokine for osteoclast differentiation. In osteoclast precursor cells, WEAT inhibited RANKL-induced activation of JNK, NF-κB, and cAMP response element-binding protein, leading to suppression of the induction of c-Fos and nuclear factor of activated T cells cytoplasmic 1, key transcription factors for osteoclast differentiation. In addition, WEAT inhibited bone resorbing activity of mature osteoclasts. Furthermore, the oral administration of WEAT reduced RANKL-induced bone resorption and trabecular bone loss in mice. Taken together, our study demonstrates that WEAT possesses a protective effect on bone destruction by inhibiting osteoclast differentiation and function.
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Affiliation(s)
- Hyunil Ha
- KM-Based Herbal Drug Development Group, Korea Institute of Oriental Medicine, Daejeon 305-811, Korea
| | - Ki-Shuk Shim
- KM-Based Herbal Drug Development Group, Korea Institute of Oriental Medicine, Daejeon 305-811, Korea
| | - Taesoo Kim
- KM-Based Herbal Drug Development Group, Korea Institute of Oriental Medicine, Daejeon 305-811, Korea
| | - Hyosun An
- KM-Based Herbal Drug Development Group, Korea Institute of Oriental Medicine, Daejeon 305-811, Korea
| | - Chung-Jo Lee
- KM-Based Herbal Drug Development Group, Korea Institute of Oriental Medicine, Daejeon 305-811, Korea
| | - Kwang Jin Lee
- KM-Based Herbal Drug Development Group, Korea Institute of Oriental Medicine, Daejeon 305-811, Korea
| | - Jin Yeul Ma
- KM-Based Herbal Drug Development Group, Korea Institute of Oriental Medicine, Daejeon 305-811, Korea.
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Lin P, Wang C, Xu B, Gao S, Guo J, Zhao X, Huang H, Zhang J, Chen X, Wang Q, Zhou W. The VGF-derived peptide TLQP62 produces antidepressant-like effects in mice via the BDNF/TrkB/CREB signaling pathway. Pharmacol Biochem Behav 2014; 120:140-8. [PMID: 24631486 DOI: 10.1016/j.pbb.2014.03.003] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 02/28/2014] [Accepted: 03/06/2014] [Indexed: 11/19/2022]
Abstract
Recent studies demonstrate that the neuropeptide VGF (nonacronymic)-derived peptide is regulated in the hippocampus by antidepressant therapies. Brain-derived neurotrophic factor (BDNF), tropomyosin-related kinase B (TrkB), cAMP response element-binding protein (CREB) signaling, and monoamine transmitter pathways mediate the behavioral effects of antidepressants, but it is not known if these pathways also contribute to the antidepressant-like effects of VGF-derived peptide TLQP62. Here the antidepressant-like effects of TLQP62 were evaluated by measuring immobility time in the forced swimming and tail suspension tests (FST and TST) following acute microinjection of the TLQP62 (0.25, 0.5 and 1 nmol/side) into the hippocampal CA1 regions. This treatment dose-dependently reduced immobility in the FST and TST compared to phosphate-buffered saline (PBS) infusion without affecting locomotor activity in the open field test (OFT). In addition, daily intrahippocampal microinfusion of TLQP62 (1 nmol/side/day; 21 days) also upregulated the expression of BDNF and the phosphorylation of CREB (pCREB) and TrkB (pTrkB) without altering CREB or TrkB. Blocking tissue plasminogen activator (tPA) by microinfusion of tPASTOP or TrkB activation by microinfusion of K252a 60 min prior to TLQP62 infusion almost completely abolished TLQP62-induced antidepressant-like effects, BDNF upregulation, and CREB/TrkB phosphorylation. In contrast, none of these effects were diminished by pretreatment with the non-specific 5-HT receptor antagonist metergoline, the selective 5-HT1A receptor antagonist NAN-190, the 5-HT synthase inhibitor parachlorophenylalanine, the selective α1-adrenoceptor antagonist prazosin, the β receptor antagonist propranolol, or the D2 receptor antagonist raclopride. Moreover, our study was also to investigate the antidepressant-like effects of TLQP62 (50, 250 and 500 nmol/kg; i.p.) on depression-related behaviors in comparison with fluoxetine (10mg/kg; i.p.). While TLQP62 and fluoxetine showed similar antidepressant-like behavioral effects in the FST of mice. Our present results strongly suggest that activation of BDNF/TrkB/CREB signaling may be involved in the antidepressant-like effects of TLQP62.
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Affiliation(s)
- Peipei Lin
- Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China; Zhejiang Provincial Key Laboratory of Pathophysiology of Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China
| | - Chuang Wang
- Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China; Zhejiang Provincial Key Laboratory of Pathophysiology of Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China.
| | - Bing Xu
- No. 97 Hospital, Xuzhou, Jiangsu 221000, PR China
| | - Siyun Gao
- Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China; Zhejiang Provincial Key Laboratory of Pathophysiology of Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China
| | - Jiejie Guo
- Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China; Zhejiang Provincial Key Laboratory of Pathophysiology of Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China
| | - Xin Zhao
- Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China; Zhejiang Provincial Key Laboratory of Pathophysiology of Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China
| | - Huihui Huang
- Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China; Zhejiang Provincial Key Laboratory of Pathophysiology of Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China
| | - Junfang Zhang
- Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China; Zhejiang Provincial Key Laboratory of Pathophysiology of Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China
| | - Xiaowei Chen
- Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China; Zhejiang Provincial Key Laboratory of Pathophysiology of Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China
| | - Qinwen Wang
- Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China; Zhejiang Provincial Key Laboratory of Pathophysiology of Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China
| | - Wenhua Zhou
- Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China; Zhejiang Provincial Key Laboratory of Pathophysiology of Ningbo University School of Medicine, Ningbo, Zhejiang 315211, PR China
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Yang JL, Lin YT, Chuang PC, Bohr VA, Mattson MP. BDNF and exercise enhance neuronal DNA repair by stimulating CREB-mediated production of apurinic/apyrimidinic endonuclease 1. Neuromolecular Med 2014; 16:161-174. [PMID: 24114393 PMCID: PMC3948322 DOI: 10.1007/s12017-013-8270-x] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Accepted: 09/26/2013] [Indexed: 01/11/2023]
Abstract
Brain-derived neurotrophic factor (BDNF) promotes the survival and growth of neurons during brain development and mediates activity-dependent synaptic plasticity and associated learning and memory in the adult. BDNF levels are reduced in brain regions affected in Alzheimer's, Parkinson's, and Huntington's diseases, and elevation of BDNF levels can ameliorate neuronal dysfunction and degeneration in experimental models of these diseases. Because neurons accumulate oxidative lesions in their DNA during normal activity and in neurodegenerative disorders, we determined whether and how BDNF affects the ability of neurons to cope with oxidative DNA damage. We found that BDNF protects cerebral cortical neurons against oxidative DNA damage-induced death by a mechanism involving enhanced DNA repair. BDNF stimulates DNA repair by activating cyclic AMP response element-binding protein (CREB), which, in turn, induces the expression of apurinic/apyrimidinic endonuclease 1 (APE1), a key enzyme in the base excision DNA repair pathway. Suppression of either APE1 or TrkB by RNA interference abolishes the ability of BDNF to protect neurons against oxidized DNA damage-induced death. The ability of BDNF to activate CREB and upregulate APE1 expression is abolished by shRNA of TrkB as well as inhibitors of TrkB, PI3 kinase, and Akt kinase. Voluntary running wheel exercise significantly increases levels of BDNF, activates CREB, and upregulates APE1 in the cerebral cortex and hippocampus of mice, suggesting a novel mechanism whereby exercise may protect neurons from oxidative DNA damage. Our findings reveal a previously unknown ability of BDNF to enhance DNA repair by inducing the expression of the DNA repair enzyme APE1.
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Affiliation(s)
- Jenq-Lin Yang
- Laboratory of Neurosciences, National Institute on Aging, Intramural Research Program, 251 Bayview Boulevard, Baltimore, MD 21224, USA; Laboratory of Molecular Gerontology, National Institute on Aging Intramural Research Program, 251 Bayview Boulevard, Baltimore, MD 21224, USA; Center for Translation Research in Biomedical Sciences, Kaohsiung Chang Gung Memorial Hospital, 123 Ta Pei Road, Kaohsiung 83301, Taiwan
| | - Yu-Ting Lin
- Center for Translation Research in Biomedical Sciences, Kaohsiung Chang Gung Memorial Hospital, 123 Ta Pei Road, Kaohsiung 83301, Taiwan
| | - Pei-Chin Chuang
- Department of Medical Research, Kaohsiung Chang Gung, Memorial Hospital, 123 Ta Pei Road, Kaohsiung 83301, Taiwan
| | - Vilhelm A Bohr
- Laboratory of Molecular Gerontology, National Institute on Aging Intramural Research Program, 251 Bayview Boulevard, Baltimore, MD 21224, USA
| | - Mark P Mattson
- Laboratory of Neurosciences, National Institute on Aging, Intramural Research Program, 251 Bayview Boulevard, Baltimore, MD 21224, USA
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Antony N, Weir JR, McDougall ARA, Mantamadiotis T, Meikle PJ, Cole TJ, Bird AD. cAMP response element binding protein1 is essential for activation of steroyl co-enzyme a desaturase 1 (Scd1) in mouse lung type II epithelial cells. PLoS One 2013; 8:e59763. [PMID: 23637738 PMCID: PMC3630165 DOI: 10.1371/journal.pone.0059763] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 02/18/2013] [Indexed: 01/20/2023] Open
Abstract
Cyclic AMP Response Element-Binding Protein 1 (Creb1) is a transcription factor that mediates cyclic adenosine 3′, 5′-monophosphate (cAMP) signalling in many tissues. Creb1−/− mice die at birth due to respiratory failure and previous genome-wide microarray analysis of E17.5 Creb1−/− fetal mouse lung identified important Creb1-regulated gene targets during lung development. The lipogenic enzymes stearoyl-CoA desaturase 1 (Scd1) and fatty acid synthase (Fasn) showed highly reduced gene expression in Creb1−/− lungs. We therefore hypothesized that Creb1 plays a crucial role in the transcriptional regulation of genes involved in pulmonary lipid biosynthetic pathways during lung development. In this study we confirmed that Scd1 and Fasn mRNA levels were down regulated in the E17.5 Creb1−/− mouse lung while the lipogenic-associated transcription factors SrebpF1, C/ebpα and Pparγ were increased. In vivo studies using germline (Creb1−/−) and lung epithelial-specific (Creb1EpiΔ/Δ) Creb1 knockout mice showed strongly reduced Scd1, but not Fasn gene expression and protein levels in lung epithelial cells. In vitro studies using mouse MLE-15 epithelial cells showed that forskolin-mediated activation of Creb1 increased both Scd1 gene expression and protein synthesis. Additionally, MLE15 cells transfected with a dominant-negative ACreb vector blocked forskolin-mediated stimulation of Scd1 gene expression. Lipid profiling in MLE15 cells showed that dominant-negative ACreb suppressed forskolin-induced desaturation of ether linked lipids to produce plasmalogens, as well as levels of phosphatidylethanolamine, ceramide and lysophosphatidylcholine. Taken together these results demonstrate that Creb1 is essential for the induction and maintenance of Scd1 in developing fetal mouse lung epithelial cells.
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Affiliation(s)
- Nisha Antony
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
| | - Jacqui R. Weir
- Baker IDI Heart and Diabetes Institute, Melbourne, Victoria
- The Ritchie Centre, Monash Institute of Medical Research, Monash University, Clayton, Victoria, Australia
| | - Annie R. A. McDougall
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
- The Ritchie Centre, Monash Institute of Medical Research, Monash University, Clayton, Victoria, Australia
| | - Theo Mantamadiotis
- Department of Pathology, University of Melbourne, Parkville, Victoria, Australia
| | - Peter J. Meikle
- Baker IDI Heart and Diabetes Institute, Melbourne, Victoria
- The Ritchie Centre, Monash Institute of Medical Research, Monash University, Clayton, Victoria, Australia
| | - Timothy J. Cole
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
- * E-mail:
| | - Anthony D. Bird
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
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DenBoer LM, Iyer A, McCluggage ARR, Li Y, Martyn AC, Lu R. JAB1/CSN5 inhibits the activity of Luman/CREB3 by promoting its degradation. Biochim Biophys Acta 2013; 1829:921-9. [PMID: 23583719 DOI: 10.1016/j.bbagrm.2013.04.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Revised: 04/01/2013] [Accepted: 04/03/2013] [Indexed: 12/26/2022]
Abstract
Luman/CREB3 (also called LZIP) is an endoplasmic reticulum (ER)-bound transcription factor that has been implicated in the ER stress response. In this study, we used the region of Luman containing the basic DNA-binding domain as bait in a yeast two-hybrid screen and identified the Jun activation domain-binding protein 1 (JAB1) or the COP9 signalosome complex unit 5 (CSN5) as an interacting protein. We confirmed their direct binding by glutathione S-transferase pull-down assays, and verified the existence of such interaction in the cellular environment by mammalian two-hybrid and co-immunoprecipitation assays. Deletion mapping studies revealed that the MPN domain in JAB1 was essential and sufficient for the binding. JAB1 also colocalized with Luman in transfected cells. More interestingly, the nuclear form of Luman was shown to promote the translocation of JAB1 into the nucleus. We found that overexpression of JAB1 shortened the half-life of Luman by 67%, and repressed its transactivation function on GAL4 and unfolded protein response element (UPRE)-containing promoters. We therefore propose that JAB1 is a novel binding partner of Luman, which negatively regulates the activity of Luman by promoting its degradation.
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Affiliation(s)
- Lisa M DenBoer
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
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Song HS, Shi S, Lu XZ, Gao F, Yan L, Wang Y, Zhuang H. Intracellular CMTM2 negatively regulates human immunodeficiency virus type-1 transcription through targeting the transcription factors AP-1 and CREB. Chin Med J (Engl) 2010; 123:2440-2445. [PMID: 21034562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023] Open
Abstract
BACKGROUND The CKLF-like MARVEL transmembrane domain-containing family (CMTM) is a novel family of proteins linking chemokines and TM4SF. Different members exhibit diverse biological functions. In this study, the effect of intracellular CMTM2 on regulating human immunodeficiency virus type-1 (HIV-1) transcription was evaluated. METHODS The effects of CMTM2 on regulating full-length HIV-1 provirus and the HIV-1 long terminal repeat (LTR)-directed transcription were assessed by luciferase assay. Transcription factor assays, using the luciferase reporter plasmids of AP-1, CRE, and NF-κB were conducted to explore the signaling pathway(s) that may be regulated by CMTM2. The potential relationship between CMTM2 and the transcription factor AP-1 was further analyzed by Western blotting analyses to investigate the effect of CMTM2 on PMA-induced ERK1/2 phosphorylation. RESULTS The results from the current study revealed that CMTM2 acts as a negative regulator of HIV-1 transcription. CMTM2 exerted a suppressive action on both full-length HIV-1 provirus and HIV-1 LTR-directed transcription. Transcription factor assays showed that CMTM2 selectively inhibited basal AP-1 and CREB activity. Co-expression of HIV-1 Tat, a potent AP-1 and CREB activator, can not reverse CMTM2-mediated AP-1 and CREB inhibition, suggesting a potent and specific effect of CMTM2 on negatively regulating these two signaling pathways. CONCLUSION Intracellular CMTM2 can negatively regulate HIV-1 transcription, at least in part, by targeting the AP-1 and CREB pathways. Exploring the mechanisms further may lead to new ways to control HIV-1 replication.
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Affiliation(s)
- Hong-shuo Song
- Department of Microbiology, Peking University Health Science Center, Beijing 100191, China
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Abstract
Endothelin-1 (ET-1) was originally discovered as a vasoconstrictor protein excreted by vascular endothelial cells. Recently, tumor-produced ET-1 has been considered to stimulate osteoblasts to form new bone, and to be an important mediator of osteoblastic bone metastasis. ET-1 has high affinity for two different membrane receptors, ET(A)R and ET(B)R, which are expressed by many types of cells including osteoblasts. Bone sialoprotein (BSP) is a phosphorylated and sulfated glycoprotein associated with mineralized connective tissues. To investigate the effects of ET-1 on BSP transcription, we used rat osteoblast-like ROS17/2.8 cells. Levels of BSP and osteopontin mRNA were increased at 12 h after treatment with ET-1 (10 ng/ml), and ET-1 at the same concentration induced luciferase activity of a -116 to +60 BSP promoter construct at 6 h. Transcriptional activity of -84BSPLUC, which contains the cAMP response element (CRE), was increased by ET-1. Furthermore, at 6 h, ET-1 (10 ng/ml) increased the binding of nuclear protein to CRE, the FGF2 response element (FRE) and the homeodomain protein-binding site (HOX). Antibodies against CREB1, JunD and Fra2 disrupted the formation of CRE-protein complexes, while antibodies against Runx2 and Dlx5 reduced the formation of FRE- and HOX-protein complexes. These findings indicate that ET-1 increases BSP transcription via the CRE, FRE and HOX sites in the rat BSP gene promoter.
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Affiliation(s)
- Xinyue Li
- Department of Periodontology, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Choi YS, Lee B, Cho HY, Reyes IB, Pu XA, Saido TC, Hoyt KR, Obrietan K. CREB is a key regulator of striatal vulnerability in chemical and genetic models of Huntington's disease. Neurobiol Dis 2009; 36:259-68. [PMID: 19632326 DOI: 10.1016/j.nbd.2009.07.014] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2009] [Revised: 06/26/2009] [Accepted: 07/15/2009] [Indexed: 11/19/2022] Open
Abstract
Evidence of dysregulation of the CREB/CRE transcriptional pathway in animal models of Huntington's disease (HD) suggests that strategies designed to augment CRE-mediated transcription may be of therapeutic value. Here, we investigated the consequences of CREB activation and repression in chemical and transgenic mouse models of HD. In the 3-nitropropionic acid (3-NP) model, CREB phospho-activation in the striatum was potently repressed within the neurotoxic "core" region prior to cell death. Conversely, marked expression of phospho-CREB, as well the CREB-regulated cytoprotective gene Bcl-2, was detected in the "penumbral" region. To examine potential contributory roles for the CREB/CRE transcriptional pathway in striatal degeneration, we used both CREB loss- (A-CREB) and gain- (VP16-CREB) of-function transgenic mouse strains. 3-NP-induced striatal lesion size and motor dysfunction were significantly increased in A-CREB mice compared to controls. Conversely, striatal damage and motor deficits were diminished in VP16-CREB mice. Furthermore, transgenic A-CREB significantly accelerated motor impairment in the YAC128 mouse model of HD. Together, these results indicate that CREB functionality is lost during the early stages of striatal cell stress and that the repression of CREB-mediated transcription contributes to the pathogenic process.
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Affiliation(s)
- Yun-Sik Choi
- Department of Neuroscience, Ohio State University, Columbus, OH 43210, USA
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Yang YM, Kim HE, Ki SH, Kim SG. Metadoxine, an ion-pair of pyridoxine and L-2-pyrrolidone-5-carboxylate, blocks adipocyte differentiation in association with inhibition of the PKA-CREB pathway. Arch Biochem Biophys 2009; 488:91-9. [PMID: 19607801 DOI: 10.1016/j.abb.2009.07.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2009] [Revised: 06/30/2009] [Accepted: 07/09/2009] [Indexed: 11/19/2022]
Abstract
Adipogenesis is orchestrated by the expression of master adipogenic regulators. In particular, phosphorylation of cAMP response element binding protein (CREB) by protein kinase A promotes CREB nuclear translocation, thereby inducing expression of the adipogenic regulators and resulting in adipogenic maturation. Although metadoxine, an ion-pair of pyridoxine and l-2-pyrrolidone-5-carboxylate, has been shown to inhibit lipid accumulation in the liver, its effect on adipocyte differentiation has never been explored. This study investigated the effects of metadoxine on the differentiation of 3T3-L1 preadipocytes and the molecular mechanism. Metadoxine treatment did not inhibit mitotic clonal expansion, but inhibited late-stage cell differentiation, suggesting that metadoxine may block the differentiation step of preadipocytes. Metadoxine inhibited CREB phosphorylation and binding to the cAMP response element, thereby repressing CCAAT/enhancer-binding protein beta during hormone-induced adipogenesis. Overall, metadoxine inhibits adipogenic differentiation in association with the inhibition of CREB/cAMP response element-dependent CCAAT/enhancer-binding protein beta induction in the protein kinase A-CREB pathway.
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Affiliation(s)
- Yoon Mee Yang
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Sillim-dong, Kwanak-gu, Seoul 151-742, South Korea
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32
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Canal CE, Chang Q, Gold PE. Intra-amygdala injections of CREB antisense impair inhibitory avoidance memory: role of norepinephrine and acetylcholine. Learn Mem 2008; 15:677-86. [PMID: 18772255 PMCID: PMC2632786 DOI: 10.1101/lm.904308] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2008] [Accepted: 07/05/2008] [Indexed: 01/12/2023]
Abstract
Infusions of CREB antisense into the amygdala prior to training impair memory for aversive tasks, suggesting that the antisense may interfere with CRE-mediated gene transcription and protein synthesis important for the formation of new memories within the amygdala. However, the amygdala also appears to modulate memory formation in distributed brain sites, through mechanisms that include the release of norepinephrine and acetylcholine within the amygdala. Thus, CREB antisense injections may affect memory by interfering with mechanisms of modulation, rather than storage, of memory. In the present experiment, rats received bilateral intra-amygdala infusions of CREB antisense (2 nmol/1 microL) 6 h prior to inhibitory avoidance training. In vivo microdialysis samples were collected from the right amygdala before, during, and following training. CREB antisense produced amnesia tested at 48 h after training. In addition, CREB antisense infusions dampened the training-related release of norepinephrine, and to a lesser extent of acetylcholine, in the amygdala. Furthermore, intra-amygdala infusions of the beta-adrenergic receptor agonist clenbuterol administered immediately after training attenuated memory impairments induced by intra-amygdala injections of CREB antisense. These findings suggest that intra-amygdala treatment with CREB antisense may affect processes involved in modulation of memory in part through interference with norepinephrine and acetylcholine neurotransmission in the amygdala.
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Affiliation(s)
- Clinton E. Canal
- Neuroscience Program, University of Illinois, Urbana–Champaign, Illinois 61820, USA
| | - Qing Chang
- Department of Animal Sciences, Department of Psychology, Department of Psychiatry, Department of Biomedical Engineering, University of Illinois, Urbana–Champaign, Illinois 61820, USA
| | - Paul E. Gold
- Neuroscience Program, University of Illinois, Urbana–Champaign, Illinois 61820, USA
- The Institute for Genomic Biology, University of Illinois, Urbana–Champaign, Illinois 61820, USA
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Barlow CA, Kitiphongspattana K, Siddiqui N, Roe MW, Mossman BT, Lounsbury KM. Protein kinase A-mediated CREB phosphorylation is an oxidant-induced survival pathway in alveolar type II cells. Apoptosis 2008; 13:681-92. [PMID: 18392938 PMCID: PMC2311383 DOI: 10.1007/s10495-008-0203-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Oxidant stress plays a role in the pathogenesis of pulmonary diseases, including fibrotic lung disease and cancer. We previously found that hydrogen peroxide (H2O2) initiates an increase in Ca2+/cAMP-response element binding protein (CREB) phosphorylation in C10 alveolar type II cells that requires activation of extracellular regulated kinases 1/2 (ERK1/2). Here, we investigated the role of crosstalk between protein kinase A (PKA) and epidermal growth factor receptor (EGFR) in oxidant-induced signaling to ERK1/2 and CREB in C10 cells. Application of H2O2 increased nuclear accumulation of PKA, and inhibition of PKA with H89 reduced oxidant-mediated phosphorylation of both CREB and ERK1/2. Single cell measurements of cAMP and redox status, using a FRET-based biosensor and a redox-sensitive GFP, respectively, indicated that H2O2 increases production of cAMP that correlates with redox state. Inhibition of EGFR activity decreased both H2O2-induced CREB phosphorylation and translocation of PKA to the nucleus, suggesting that crosstalk between PKA and EGFR underlies the oxidant-induced CREB response. Furthermore, knockdown of CREB expression using siRNA led to a decrease in bcl-2 and an increase in oxidant-induced apoptosis. Together these data reveal a novel role for crosstalk between PKA, ERK1/2 and CREB that mediates cell survival during oxidant stress.
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Affiliation(s)
- Christy A. Barlow
- Department of Pharmacology, University of Vermont, 89 Beaumont Avenue, Burlington, VT 05405 USA
- Department of Pharmacology, University of Wisconsin, Madison, WI 53713 USA
| | | | - Nazli Siddiqui
- Department of Medicine, University of Chicago, Chicago, IL 60637 USA
| | - Michael W. Roe
- Department of Medicine, University of Chicago, Chicago, IL 60637 USA
| | - Brooke T. Mossman
- Department of Pathology, University of Vermont, Burlington, VT 05405 USA
| | - Karen M. Lounsbury
- Department of Pharmacology, University of Vermont, 89 Beaumont Avenue, Burlington, VT 05405 USA
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Manu KA, Kuttan G. Ursolic acid induces apoptosis by activating p53 and caspase-3 gene expressions and suppressing NF-kappaB mediated activation of bcl-2 in B16F-10 melanoma cells. Int Immunopharmacol 2008; 8:974-81. [PMID: 18486908 DOI: 10.1016/j.intimp.2008.02.013] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2007] [Revised: 02/28/2008] [Accepted: 02/28/2008] [Indexed: 11/22/2022]
Abstract
The objective of this study was to assess the effect of ursolic acid, a triterpene on inducing apoptosis in B16F-10 melanoma cells. Treatment of B16F-10 cells with nontoxic concentration of ursolic acid showed the presence of apoptotic bodies and induced DNA fragmentation in a dose depended manner. The apoptotic genes p53 and caspase-3 were found to be upregulated while the anti-apoptotic gene bcl-2 was down regulated in ursolic acid treated cells. The transcription factors NF-kappaBp65, NF-kappaBp50, NF-kappaBc-Rel, c-FOS, ATF-2 and CREB-1 were found to be inhibited significantly (p<0.001) in ursolic acid treated cells compared to untreated control. The pro-inflammatory cytokine production and gene expression of TNF-alpha, IL-1beta, IL-6 and GM-CSF were down regulated in ursolic acid treated cells compared to nontreated B16F-10 metastatic melanoma cells. All these results demonstrate that ursolic acid induce apoptosis via inhibition of NF-kappaB induced bcl-2 mediated anti-apoptotic pathway and subsequent activation of p53 mediated and TNF-alpha induced caspase-3 mediated pro-apoptotic pathways.
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Affiliation(s)
- K A Manu
- Amala Cancer Research Centre, Amala Nagar, Thrissur-680555, Kerala State, India
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Morris RHK, Tonks AJ, Jones KP, Ahluwalia MK, Thomas AW, Tonks A, Jackson SK. DPPC regulates COX-2 expression in monocytes via phosphorylation of CREB. Biochem Biophys Res Commun 2008; 370:174-8. [PMID: 18355441 DOI: 10.1016/j.bbrc.2008.03.052] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2008] [Accepted: 03/12/2008] [Indexed: 01/08/2023]
Abstract
The major phospholipid in pulmonary surfactant dipalmitoyl phosphatidylcholine (DPPC) has been shown to modulate inflammatory responses. Using human monocytes, this study demonstrates that DPPC significantly increased PGE(2) (P<0.05) production by 2.5-fold when compared to untreated monocyte controls. Mechanistically, this effect was concomitant with an increase in COX-2 expression which was abrogated in the presence of a COX-2 inhibitor. The regulation of COX-2 expression was independent of NF-kappaB activity. Further, DPPC increased the phosphorylation of the cyclic AMP response element binding protein (CREB; an important nuclear transcription factor important in regulating COX-2 expression). In addition, we also show that changing the fatty acid groups of PC (e.g. using l-alpha-phosphatidylcholine beta-arachidonoyl-gamma-palmitoyl (PAPC)) has a profound effect on the regulation of COX-2 expression and CREB activation. This study provides new evidence for the anti-inflammatory activity of DPPC and that this activity is at least in part mediated via CREB activation of COX-2.
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Affiliation(s)
- R H K Morris
- Cardiff School of Health Sciences, University of Wales Institute Cardiff, Western Avenue, Llandaff, Cardiff, Wales CF5 2YB, UK.
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Abstract
Genes regulated by cyclic AMP-response element-binding protein (CREB) have been reported to suppress apoptosis, induce cell proliferation, and mediate inflammation and tumor metastasis. However, it is not clear whether CREB is critically involved in lung carcinogenesis. We found that non-small cell lung cancer (NSCLC) cell lines exhibited elevated constitutive activity in CREB, in its immediate upstream kinases (ribosomal s6 kinase and extracellular signal kinase), and in the CREB-regulated cell survival proteins Bcl-2 and Bcl-xL. We hypothesized that constitutively active CREB is important to lung cancer cell growth and survival and therefore could be a potential therapeutic target for NSCLC. Ectopic expression of dominant repressor CREB and transfection with small interfering RNA against CREB suppressed the growth and survival of NSCLC cells and induced apoptotic cell death. Furthermore, treating H1734 NSCLC cells with an inhibitor of the CREB signaling pathway Ro-31-8220 inhibited CREB activation by blocking the activity of extracellular signal kinase and ribosomal s6 kinase, arrested the cell cycle at the G(2)-M phase, and subsequently induced apoptosis with the suppression of Bcl-2 and Bcl-xL expression. Ro-31-8220 suppressed both the anchorage-dependent and independent growth of NSCLC cells, but its cytotoxic effect was much less prominent in normal bronchial epithelial cells. Our results indicate that active CREB plays an important role in NSCLC cell growth and survival. Thus, agents that suppress CREB activation could have potential therapeutic value for NSCLC treatment.
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Affiliation(s)
- Sita Aggarwal
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, USA
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37
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Lee SY, Min J. Regulation of NO from endothelial cells by the decrease of cellular cAMP under arsenite exposure. J Microbiol Biotechnol 2008; 18:392-395. [PMID: 18309289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In an attempt to delineate the direct effect of arsenite-induced endothelial dysfunction on nitric oxide (NO) production, confluent bovine aortic endothelial cells (BAEC) were incubated with arsenite, and endothelial NO synthase expression and NO production were measured. Exposure of arsenite decreased NO production for up to 24 h. This decrease was accompanied by decreases in cAMP, protein kinase A (PKA) activity, and furthermore, significant reduction of pCREB. In conclusion, this study is the first to demonstrate that exposure of arsenite decreases NO production by a reduction of pCREB and PKA activity that may be mediated by cAMP, leading to endothelial dysfunction.
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Affiliation(s)
- Soo Youn Lee
- Division of Environmental and Chemical Engineering, Chonbuk National University, Jeonju 561-756, Korea
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Abstract
Salt inducible kinase (SIK) was identified as a molecule induced in the adrenal glands of rats fed with a high-salt diet. A major downstream of SIK is regulation of camp-responsive element (CRE)-dependent gene expression. SIK represses the activity of CRE-binding protein (CREB) by phosphorylating a CREB-specific co-activator transducer of regulated CREB activity (TORC). When TORC is dephosphorylated it activates CREB in a CREB-phosphorylation independent manner. The importance of the dephosphorylation of TORC has been suggested by the fact that a kinase inhibitor staurosporine induces dephosphorylation of TORC and upregulates the gene expression of CYP11A, CYP11B1, CYP11B2 and StAR in adrenocortical cells. The identification of SIK caused a stir in the field of CREB studies and led to disclosure of cascades hidden behind the classical mechanism for CREB activity.
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Affiliation(s)
- Hiroshi Takemori
- Laboratory of Cell Signaling and Metabolism, National Institute of Biomedical Innovation, 7-6-8 Asagi, Saito, Ibaraki, Osaka, Japan.
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Endo A, Sumi D, Kumagai Y. 1,2-Naphthoquinone disrupts the function of cAMP response element-binding protein through covalent modification. Biochem Biophys Res Commun 2007; 361:243-8. [PMID: 17658470 DOI: 10.1016/j.bbrc.2007.07.024] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2007] [Accepted: 07/08/2007] [Indexed: 11/21/2022]
Abstract
1,2-Naphthoquinone (1,2-NQ) is an atmospheric contaminant with electrophilic properties that allow it to react readily with protein thiol groups such as those found on the cAMP response element-binding protein (CREB), a transcription factor with conserved cysteine residues that regulate DNA binding. In the present study, we explored the possibility that the interaction of 1,2-NQ with CREB will affect its activity, resulting in down-regulation of gene expression. With bovine aortic endothelial cells (BAECs) and a cell-free system, 1,2-NQ was found to covalently bind to CREB, and inhibit its DNA binding activity under conditions that were blocked by dithiothreitol. CRE-dependent luciferase activity and the down-regulation of Bcl-2 expression were suppressed by exposure of BAECs to 1,2-NQ. This phenomenon was not seen with the hydrocarbon, naphthalene, which lacks any electrophilic properties. The results indicate that CREB is a molecular target for 1,2-NQ which through irreversible binding, inhibits the function of this transcription factor.
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Affiliation(s)
- Akiko Endo
- Department of Environmental Medicine, Doctoral Programs in Medical Sciences, Graduate School of Comprehensive Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
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Kumar AP, Bhaskaran S, Ganapathy M, Crosby K, Davis MD, Kochunov P, Schoolfield J, Yeh IT, Troyer DA, Ghosh R. Akt/cAMP-responsive element binding protein/cyclin D1 network: a novel target for prostate cancer inhibition in transgenic adenocarcinoma of mouse prostate model mediated by Nexrutine, a Phellodendron amurense bark extract. Clin Cancer Res 2007; 13:2784-94. [PMID: 17473212 PMCID: PMC1948816 DOI: 10.1158/1078-0432.ccr-06-2974] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Development of prostate cancer prevention strategies is an important priority to overcome high incidence, morbidity, and mortality. Recently, we showed that Nexrutine, an herbal extract, inhibits prostate cancer cell proliferation through modulation of Akt and cAMP-responsive element binding protein (CREB)-mediated signaling pathways. However, it is unknown if Nexrutine can be developed as a dietary supplement for the prevention of prostate cancer. In this study, we used the transgenic adenocarcinoma of mouse prostate (TRAMP) model to examine the ability of Nexrutine to protect TRAMP mice from developing prostate cancer. EXPERIMENTAL DESIGN Eight-week-old TRAMP mice were fed with pelleted diet containing 300 and 600 mg/kg Nexrutine for 20 weeks. Efficacy of Nexrutine was evaluated by magnetic resonance imaging at 18 and 28 weeks of progression and histologic analysis of prostate tumor or tissue at the termination of the experiment. Tumor tissue was analyzed for modulation of various signaling molecules. RESULTS We show that Nexrutine significantly suppressed palpable tumors and progression of cancer in the TRAMP model. Expression of total and phosphorylated Akt, CREB, and cyclin D1 was significantly reduced in prostate tissue from Nexrutine intervention group compared with tumors from control animals. Nexrutine also inhibited cyclin D1 transcriptional activity in androgen-independent PC-3 cells. Overexpression of kinase dead Akt mutant or phosphorylation-defective CREB inhibited cyclin D1 transcriptional activity. CONCLUSIONS The current study shows that Nexrutine-mediated targeting of Akt/CREB-induced activation of cyclin D1 prevents the progression of prostate cancer. Expression of CREB and phosphorylated CREB increased in human prostate tumors compared with normal tissue, suggesting their potential use as prognostic markers.
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Affiliation(s)
- Addanki P Kumar
- Department of Urology, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229, USA.
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Abstract
It has been proposed that defects in the assembly of spliceosomal uridine-rich small nuclear ribonucleoprotein (U snRNP) complexes could account for the death of motor neurons in spinal muscular atrophy (SMA). We discovered that infection of cultured cells with poliovirus results in the specific cleavage of the host factor Gemin3 by a virus-encoded proteinase, 2A(pro). Gemin3 is a component of the macromolecular SMN complex that mediates assembly of U snRNP complexes by aiding the heptameric oligomerization of Sm proteins onto U snRNAs. Using in vitro Sm core assembly assays, we found that lowering the intracellular amounts of Gemin3 by either poliovirus infection or small interfering RNA (siRNA)-mediated knockdown of Gemin3 resulted in reduced assembly of U snRNPs. Immunofluorescence analyses revealed a specific redistribution of Sm proteins from the nucleoplasm to the cytoplasmic periphery of the nucleus in poliovirus-infected cells. We propose that defects in U snRNP assembly may be shared features of SMA and poliomyelitis.
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Affiliation(s)
- Laura L. Almstead
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Peter Sarnow
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California 94305, USA
- Corresponding author.E-MAIL ; FAX (650) 498-7147
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Thirunavukkarasu M, Juhasz B, Zhan L, Menon VP, Tosaki A, Otani H, Maulik N. VEGFR1 (Flt-1+/-) gene knockout leads to the disruption of VEGF-mediated signaling through the nitric oxide/heme oxygenase pathway in ischemic preconditioned myocardium. Free Radic Biol Med 2007; 42:1487-95. [PMID: 17448895 PMCID: PMC1924469 DOI: 10.1016/j.freeradbiomed.2007.02.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2006] [Revised: 01/19/2007] [Accepted: 02/07/2007] [Indexed: 11/22/2022]
Abstract
This report demonstrates that mice deficient in Flt-1 failed to establish ischemic preconditioning (PC)-mediated cardioprotection in isolated working buffer-perfused ischemic/reperfused (I/R) hearts compared to wild type (WT) subjected to the same PC protocol. WT and Flt-1+/- mice were divided into four groups: (1) WT I/R, (2) WT + PC, (3) Flt-1+/- I/R, and (4) Flt-1+/- + PC. Group 1 and 3 mice were subjected to 30 min of ischemia followed by 2 h of reperfusion and group 2 and 4 mice were subjected to four episodes of 4-min global ischemia followed by 6 min of reperfusion before ischemia/reperfusion. For both wild-type and Flt-1+/- mice, the postischemic functional recovery for the hearts was lower than the baseline, but the recovery for the knockout mice was less compared to the WT mice even in preconditioning. The myocardial infarction and apoptosis were higher in Flt-1+/- compared to wild-type I/R. Flt-1+/- KO mice demonstrated pronounced inhibition of the expression of iNOS, p-AKT & p-eNOS. Significant inhibition of STAT3 & CREB were also observed along with the inhibition of HO-1 mRNA. Results demonstrate that Flt-1+/- mouse hearts are more susceptible to ischemia/reperfusion injury and also document that preconditioning is not as effective as found in WT and therefore suggest the importance of VEGF/Flt-1 signaling in ischemic/reperfused myocardium.
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Affiliation(s)
- Mahesh Thirunavukkarasu
- Department of Surgery, Molecular Cardiology and Angiogenesis Laboratory, University of Connecticut Medical Center, Farmington, CT, USA
| | - Bela Juhasz
- Department of Surgery, Molecular Cardiology and Angiogenesis Laboratory, University of Connecticut Medical Center, Farmington, CT, USA
| | - Lijun Zhan
- Department of Surgery, Molecular Cardiology and Angiogenesis Laboratory, University of Connecticut Medical Center, Farmington, CT, USA
| | | | - Arpad Tosaki
- Department of Physiology, University of Debrasen, Hungary
| | - Hajime Otani
- Department of Thoracic and Cardiovascular Surgery, Kansai Medical University, School of Medicine, Osaka, Japan
| | - Nilanjana Maulik
- Department of Surgery, Molecular Cardiology and Angiogenesis Laboratory, University of Connecticut Medical Center, Farmington, CT, USA
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Kundu JK, Surh YJ. Epigallocatechin gallate inhibits phorbol ester-induced activation of NF-kappa B and CREB in mouse skin: role of p38 MAPK. Ann N Y Acad Sci 2007; 1095:504-12. [PMID: 17404063 DOI: 10.1196/annals.1397.054] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The modulation of intracellular signaling network involved in an inappropriate expression of cyclooxygenase-2 (COX-2) is a pragmatic approach for chemoprevention with a wide variety of dietary phytochemicals. Epigallocatechin gallate (EGCG), a major green tea polyphenol, is one of the most extensively investigated chemopreventive agents. Our previous study revealed that EGCG inhibited expression of COX-2 and activation of mitogen-activated protein kinases (MAPKs) in mouse skin stimulated with a prototype tumor promotor 12-O-tetradecanoylphorbol-13-acetate (TPA). This study was aimed at identifying transcription factors as molecular targets of EGCG in downregulating COX-2 expression. We found that EGCG inhibited TPA-induced DNA binding of NF-kappaB and CREB in mouse skin in vivo. EGCG also suppressed TPA-induced phosphorylation and subsequent degradation of IkappaBalpha, and prevented nuclear translocation of p65. We also examined whether extracellular signal-regulated protein kinase (ERK) and p38 MAPK, which are known to regulate activation of NF-kappaB, can also modulate CREB DNA binding. Pretreatment with U0126 and SB203580, pharmacological inhibitors of ERK and p38 MAPK, respectively, showed that SB203580, but not U0126, attenuated TPA-induced CREB DNA binding in mouse skin. Taken together, EGCG inhibited TPA-induced DNA binding of NF-kappaB and CREB by blocking activation of p38 MAPK, which may provide a molecular basis of COX-2 inhibition by EGCG in mouse skin in vivo.
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Affiliation(s)
- Joydeb Kumar Kundu
- College of Pharmacy, Seoul National University, Shillim-dong, Kwanak-ku, Seoul 151-742, Korea
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44
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Tullai JW, Chen J, Schaffer ME, Kamenetsky E, Kasif S, Cooper GM. Glycogen synthase kinase-3 represses cyclic AMP response element-binding protein (CREB)-targeted immediate early genes in quiescent cells. J Biol Chem 2007; 282:9482-9491. [PMID: 17277356 PMCID: PMC1839957 DOI: 10.1074/jbc.m700067200] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Despite its central role in cell survival and proliferation, the transcriptional program controlled by GSK-3 is poorly understood. We have employed a systems level approach to characterize gene regulation downstream of PI 3-kinase/Akt/GSK-3 signaling in response to growth factor stimulation of quiescent cells. Of 31 immediate-early genes whose induction was dependent on PI 3-kinase signaling, 12 were induced directly by inhibition of GSK-3. Most of the GSK-3-regulated genes encoded transcription factors, growth factors, and signaling molecules. Binding sites for CREB were highly over-represented in the upstream regions of these genes, with 9 genes containing CREB sites that were conserved in mouse orthologs. Binding sites predicted in 6 genes were confirmed by CREB chromatin immunoprecipitation and forskolin induction of CBP binding. Moreover, CREB siRNA substantially blocked induction of 5 genes by forskolin and of 3 genes following inhibition of GSK-3. These results indicate that GSK-3 actively represses gene expression in quiescent cells, with inhibition of CREB playing a key role in this transcriptional response.
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Affiliation(s)
- John W Tullai
- Department of Biology, Boston University, Boston, Massachusetts 02215
| | - Jie Chen
- Department of Biology, Boston University, Boston, Massachusetts 02215
| | | | - Eliza Kamenetsky
- Department of Biology, Boston University, Boston, Massachusetts 02215
| | - Simon Kasif
- Bioinformatics Program, Boston University, Boston, Massachusetts 02215; Department of Biomedical Engineering, Boston University, Boston, Massachusetts 02215
| | - Geoffrey M Cooper
- Department of Biology, Boston University, Boston, Massachusetts 02215; Bioinformatics Program, Boston University, Boston, Massachusetts 02215.
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Hsieh YS, Yang SF, Kuo DY. Intracerebral administration of protein kinase A or cAMP response element-binding protein antisense oligonucleotide can modulate amphetamine-mediated appetite suppression in free-moving rats. Am J Physiol Endocrinol Metab 2007; 292:E123-31. [PMID: 16896163 DOI: 10.1152/ajpendo.00195.2006] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Although amphetamine (AMPH)-induced appetite suppression has been attributed to its inhibitory action on neuropeptide Y (NPY), an appetite neurotransmitter abundant in the brain, molecular mechanisms underlying this effect are not well known. This study examined the possible role of protein kinase A (PKA) and cAMP response element-binding protein (CREB) signaling in this anorectic effect, and the results showed that both PKA and CREB mRNA levels in hypothalamus were increased following AMPH treatment, which was relevant to a reduction of NPY mRNA level. To determine whether PKA or CREB was involved in the anorectic response, intracerebroventricular infusions of antisense oligonucleotide (or missense control) were performed 60 min before daily AMPH treatment in conscious rats, and results showed that either PKA or CREB knockdown could block AMPH-induced anorexia as well as restore NPY mRNA level, indicating the respective involvement of PKA and CREB signaling in the regulation of NPY gene expression. It is suggested that hypothalamic PKA and CREB signaling may involve the central regulation of AMPH-mediated feeding suppression via the modulation of NPY gene expression.
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Affiliation(s)
- Yih-Shou Hsieh
- Dept. of Physiology, Chung Shan Medical University, Taichung City 40201, Taiwan
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Wheeler DG, Barrett CF, Tsien RW. L-type calcium channel ligands block nicotine-induced signaling to CREB by inhibiting nicotinic receptors. Neuropharmacology 2006; 51:27-36. [PMID: 16631827 DOI: 10.1016/j.neuropharm.2006.02.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2006] [Revised: 02/17/2006] [Accepted: 02/20/2006] [Indexed: 11/30/2022]
Abstract
Nicotinic acetylcholine receptors (nAChRs) are inhibited by several drugs that are commonly thought to be specific for L-type calcium channels (LTCCs). In neurons, LTCCs are activated by nicotine-induced depolarization to engage downstream signaling events; however, the role of LTCC drug interactions with nAChRs in signaling has not been examined in detail. We investigated the effects of LTCC ligands on nAChR currents and downstream signaling in rat superior cervical ganglion (SCG) neurons. We found that 10microM nicotine and 40mM K(+) both reversibly depolarize SCG neurons to -20mV, sufficient to activate LTCCs and downstream signaling, including induction of nuclear phospho-CREB (pCREB); this induction was blocked by LTCC antagonists. Interestingly, the effects of LTCC antagonists on nicotine-induced signaling to CREB are not mediated by their actions on LTCCs, but rather via inhibition of nAChRs, which prevents nicotine-induced depolarization. We show that this effect is sufficient to block pCREB induction in neurons expressing an antagonist-insensitive LTCC. Taken together, our data show that, at concentrations typically used to block LTCCs, these antagonists inhibit nAChR currents and downstream signaling. These findings serve as a caution in attributing a role for LTCCs when using these drugs experimentally or therapeutically.
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Affiliation(s)
- Damian G Wheeler
- Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA 94305-5345, USA
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Fukuyama K, Ichiki T, Imayama I, Ohtsubo H, Ono H, Hashiguchi Y, Takeshita A, Sunagawa K. Thyroid hormone inhibits vascular remodeling through suppression of cAMP response element binding protein activity. Arterioscler Thromb Vasc Biol 2006; 26:2049-55. [PMID: 16794221 DOI: 10.1161/01.atv.0000233358.87583.01] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Although accumulating evidences suggest that impaired thyroid function is a risk for ischemic heart disease, the molecular mechanism of anti-atherosclerotic effects of thyroid hormone is poorly defined. We examined whether thyroid hormone affects signaling pathway of angiotensin II (Ang II), which is critically involved in a broad aspect of cardiovascular disease process. METHODS AND RESULTS 3,3',5-triiodo-L-thyronine (T3) did not show a significant effect on Ang II-induced activation of extracellular signal-regulated protein kinase or p38 mitogen-activated protein kinase in vascular smooth muscle cells (VSMCs), whereas T3 inhibited Ang II-induced activation of cAMP response element (CRE) binding protein (CREB), a nuclear transcription factor involved in the vascular remodeling process. Coimmunoprecipitaion assay revealed the protein-protein interaction between thyroid hormone receptor and CREB. T3 reduced an expression level of interleukin (IL)-6 mRNA, CRE-dependent promoter activity, and protein synthesis induced by Ang II. Administration of T3 (100 microg/100 g for 14 days) to rats attenuated neointimal formation after balloon injury of carotid artery with reduced CREB activation and BrdU incorporation. CONCLUSIONS These results suggested that T3 inhibits CREB/CRE signaling pathway and suppresses cytokine expression and VSMCs proliferation, which may account for, at least in part, an anti-atherosclerotic effect of thyroid hormone.
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Affiliation(s)
- Kae Fukuyama
- Department of Cardiovascular Medicine, Kyushu University Graduate School of Medical Sciences, 3-1-1 Maidashi, Higashi-ku, 812-8582 Fukuoka, Japan
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Girard C, Neel H, Bertrand E, Bordonné R. Depletion of SMN by RNA interference in HeLa cells induces defects in Cajal body formation. Nucleic Acids Res 2006; 34:2925-32. [PMID: 16738131 PMCID: PMC1474063 DOI: 10.1093/nar/gkl374] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2006] [Accepted: 04/28/2006] [Indexed: 12/13/2022] Open
Abstract
Neuronal degeneration in spinal muscular atrophy (SMA) is caused by reduced expression of the survival of motor neuron (SMN) protein. The SMN protein is ubiquitously expressed and is present both in the cytoplasm and in the nucleus where it localizes in Cajal bodies. The SMN complex plays an essential role for the biogenesis of spliceosomal U-snRNPs. In this article, we have used an RNA interference approach in order to analyse the effects of SMN depletion on snRNP assembly in HeLa cells. Although snRNP profiles are not perturbed in SMN-depleted cells, we found that SMN depletion gives rise to cytoplasmic accumulation of a GFP-SmB reporter protein. We also demonstrate that the SMN protein depletion induces defects in Cajal body formation with coilin being localized in multiple nuclear foci and in nucleolus instead of canonical Cajal bodies. Interestingly, the coilin containing foci do not contain snRNPs but appear to co-localize with U85 scaRNA. Because Cajal bodies represent the location in which snRNPs undergo 2'-O-methylation and pseudouridylation, our results raise the possibility that SMN depletion might give rise to a defect in the snRNA modification process.
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Affiliation(s)
- Cyrille Girard
- Institut de Génétique Moléculaire, CNRS UMR5535IFR 122, 1919 route de Mende, 34000 Montpellier, France
| | - Henry Neel
- Institut de Génétique Moléculaire, CNRS UMR5535IFR 122, 1919 route de Mende, 34000 Montpellier, France
| | - Edouard Bertrand
- Institut de Génétique Moléculaire, CNRS UMR5535IFR 122, 1919 route de Mende, 34000 Montpellier, France
| | - Rémy Bordonné
- Institut de Génétique Moléculaire, CNRS UMR5535IFR 122, 1919 route de Mende, 34000 Montpellier, France
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Lemm I, Girard C, Kuhn AN, Watkins NJ, Schneider M, Bordonné R, Lührmann R. Ongoing U snRNP biogenesis is required for the integrity of Cajal bodies. Mol Biol Cell 2006; 17:3221-31. [PMID: 16687569 PMCID: PMC1483051 DOI: 10.1091/mbc.e06-03-0247] [Citation(s) in RCA: 149] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Cajal bodies (CBs) have been implicated in the nuclear phase of the biogenesis of spliceosomal U small nuclear ribonucleoproteins (U snRNPs). Here, we have investigated the distribution of the CB marker protein coilin, U snRNPs, and proteins present in C/D box small nucleolar (sno)RNPs in cells depleted of hTGS1, SMN, or PHAX. Knockdown of any of these three proteins by RNAi interferes with U snRNP maturation before the reentry of U snRNA Sm cores into the nucleus. Strikingly, CBs are lost in the absence of hTGS1, SMN, or PHAX and coilin is dispersed in the nucleoplasm into numerous small foci. This indicates that the integrity of canonical CBs is dependent on ongoing U snRNP biogenesis. Spliceosomal U snRNPs show no detectable concentration in nuclear foci and do not colocalize with coilin in cells lacking hTGS1, SMN, or PHAX. In contrast, C/D box snoRNP components concentrate into nuclear foci that partially colocalize with coilin after inhibition of U snRNP maturation. We demonstrate by siRNA-mediated depletion that coilin is required for the condensation of U snRNPs, but not C/D box snoRNP components, into nucleoplasmic foci, and also for merging these factors into canonical CBs. Altogether, our data suggest that CBs have a modular structure with distinct domains for spliceosomal U snRNPs and snoRNPs.
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Affiliation(s)
- Ira Lemm
- *Department of Cellular Biochemistry, Max-Planck-Institute for Biophysical Chemistry, D-37077 Göttingen, Germany
| | - Cyrille Girard
- Institut de Génétique Moléculaire, UMR5535 CNRS, Montpellier, France; and
| | - Andreas N. Kuhn
- *Department of Cellular Biochemistry, Max-Planck-Institute for Biophysical Chemistry, D-37077 Göttingen, Germany
| | - Nicholas J. Watkins
- Institute for Cell and Molecular Biosciences, University of Newcastle, Newcastle upon Tyne, NE2 4HH, United Kingdom
| | - Marc Schneider
- *Department of Cellular Biochemistry, Max-Planck-Institute for Biophysical Chemistry, D-37077 Göttingen, Germany
| | - Rémy Bordonné
- Institut de Génétique Moléculaire, UMR5535 CNRS, Montpellier, France; and
| | - Reinhard Lührmann
- *Department of Cellular Biochemistry, Max-Planck-Institute for Biophysical Chemistry, D-37077 Göttingen, Germany
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Dworet JH, Meinkoth JL. Interference with 3′,5′-Cyclic Adenosine Monophosphate Response Element Binding Protein Stimulates Apoptosis through Aberrant Cell Cycle Progression and Checkpoint Activation. Mol Endocrinol 2006; 20:1112-20. [PMID: 16410315 DOI: 10.1210/me.2005-0386] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Abstract
We previously reported that protein kinase A activity is an important determinant of thyroid cell survival. Given the important role of cAMP response element binding protein (CREB) in mediating the transcriptional effects of protein kinase A, we explored whether interference with CREB family members impaired thyroid cell survival. Expression of A-CREB, a dominant-negative CREB mutant that inhibits CREB DNA binding activity, induced apoptosis in rat thyroid cells. A-CREB inhibited CRE-regulated gene expression but failed to alter the expression of bcl-2 family members or of well-characterized inhibitors of apoptosis. To elucidate the mechanism through which impaired CREB function triggered apoptosis, its effects on cell proliferation were examined. Expression of A-CREB inhibited cell number increases, in part due to delayed cell cycle transit. Protracted S-phase progression in A-CREB-expressing cells was sufficient to activate a checkpoint response characterized by Chk-1, histone H2A.X, and p53 phosphorylation. To determine whether cell cycle progression was required for apoptosis, the effects of p27 overexpression were investigated. Overexpression of p27 prevented cell cycle progression, checkpoint activation, and apoptosis in A-CREB-expressing cells. These data reveal a novel mechanism through which interference with CREB abrogates cell survival, through checkpoint activation secondary to cell cycle delay. This study may explain how interference with CREB induces apoptosis in cells where alterations in the expression of pro- and anti-survival genes are not detected.
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Affiliation(s)
- Jessica H Dworet
- Department of Pharmacology, University of Pennsylvania School of Medicine, 420 Curie Boulevard, Philadelphia, Pennsylvania 19104-6061, USA
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