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Leopold Wager CM, Bonifacio JR, Simper J, Naoun AA, Arnett E, Schlesinger LS. Activation of transcription factor CREB in human macrophages by Mycobacterium tuberculosis promotes bacterial survival, reduces NF-kB nuclear transit and limits phagolysosome fusion by reduced necroptotic signaling. PLoS Pathog 2023; 19:e1011297. [PMID: 37000865 PMCID: PMC10096260 DOI: 10.1371/journal.ppat.1011297] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 04/12/2023] [Accepted: 03/13/2023] [Indexed: 04/03/2023] Open
Abstract
Macrophages are a first line of defense against pathogens. However, certain invading microbes modify macrophage responses to promote their own survival and growth. Mycobacterium tuberculosis (M.tb) is a human-adapted intracellular pathogen that exploits macrophages as an intracellular niche. It was previously reported that M.tb rapidly activates cAMP Response Element Binding Protein (CREB), a transcription factor that regulates diverse cellular responses in macrophages. However, the mechanism(s) underlying CREB activation and its downstream roles in human macrophage responses to M.tb are largely unknown. Herein we determined that M.tb-induced CREB activation is dependent on signaling through MAPK p38 in human monocyte-derived macrophages (MDMs). Using a CREB-specific inhibitor, we determined that M.tb-induced CREB activation leads to expression of immediate early genes including COX2, MCL-1, CCL8 and c-FOS, as well as inhibition of NF-kB p65 nuclear localization. These early CREB-mediated signaling events predicted that CREB inhibition would lead to enhanced macrophage control of M.tb growth, which we observed over days in culture. CREB inhibition also led to phosphorylation of RIPK3 and MLKL, hallmarks of necroptosis. However, this was unaccompanied by cell death at the time points tested. Instead, bacterial control corresponded with increased colocalization of M.tb with the late endosome/lysosome marker LAMP-1. Increased phagolysosomal fusion detected during CREB inhibition was dependent on RIPK3-induced pMLKL, indicating that M.tb-induced CREB signaling limits phagolysosomal fusion through inhibition of the necroptotic signaling pathway. Altogether, our data show that M.tb induces CREB activation in human macrophages early post-infection to create an environment conducive to bacterial growth. Targeting certain aspects of the CREB-induced signaling pathway may represent an innovative approach for development of host-directed therapeutics to combat TB.
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Affiliation(s)
- Chrissy M. Leopold Wager
- Host Pathogen Interaction Program, Texas Biomedical Research Institute, San Antonio, Texas, United States of America
| | - Jordan R. Bonifacio
- Host Pathogen Interaction Program, Texas Biomedical Research Institute, San Antonio, Texas, United States of America
| | - Jan Simper
- Host Pathogen Interaction Program, Texas Biomedical Research Institute, San Antonio, Texas, United States of America
- Medical Scientist Training Program, Department of Microbiology, Immunology and Molecular Genetics, UT Health Science Center San Antonio, San Antonio, Texas, United States of America
| | - Adrian A. Naoun
- Department of Biology, The University of Texas at San Antonio, San Antonio, Texas, United States of America
| | - Eusondia Arnett
- Host Pathogen Interaction Program, Texas Biomedical Research Institute, San Antonio, Texas, United States of America
| | - Larry S. Schlesinger
- Host Pathogen Interaction Program, Texas Biomedical Research Institute, San Antonio, Texas, United States of America
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2
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Park JE, Han JS. HM-chromanone suppresses hepatic glucose production via activation of AMP-activated protein kinase in HepG2 cell. Eur J Pharmacol 2022; 928:175108. [PMID: 35718128 DOI: 10.1016/j.ejphar.2022.175108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 06/08/2022] [Accepted: 06/13/2022] [Indexed: 11/03/2022]
Abstract
We investigated whether (E)-5-hydroxy-7-methoxy-3-(2-hydroxybenzyl)-4-chromanone (HM-chromanone) could suppress the transcription factors expression and enzymes involved in glucose production by activating AMPK in hepatocytes. HepG2 cells were treated with a medium containing HM-chromanone (5-100 μM), compound C (10 μM) and insulin (100 nM). Glucose production and glycogen synthesis assay were determined using a glucose assay kit and glycogen assay kit, respectively. Activities of AMP-activated protein kinase (AMPK), acetyl CoA carboxylase (ACC), cAMP response element-binding protein (CREB), PPAR coactivator-1α (PGC1α), CREB-regulated transcription coactivator 2 (CRTC2), Glycogen synthase kinase (GSK3β), Phosphoenolpyruvate carboxykinase (PEPCK), glycogen synthase (GS), Glucose 6-phosphatase (G6pase) and β-actin were determined by Western blot analysis. HM-chromanone significantly inhibited hepatic glucose production and increased glycogen synthesis by activating glycogen synthase. HM-chromanone induced the phosphorylation of CRTC2 and GSK-3β by phosphorylating AMPK in HepG2 cells, which was confirmed by compound C. Furthermore, it significantly decreased the phosphorylation of CREB in a time- and concentration-dependent manner, and the effect was reversed in the presence of compound C. Therefore, the complex formation of CRTC2 and CREB was inhibited. HM-chromanone inhibited the expression of PGC-1α, PEPCK, and G6Pase genes involved in production of hepatic glucose. The results showed that HM-chromanone activates AMPK in a time and concentration dependent manner, thus suppressing hepatic glucose production and increasing glycogen synthesis in HepG2 cells.
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Affiliation(s)
- Jae Eun Park
- Department of Food Science and Nutrition, Pusan National University, Busan, 46241, Republic of Korea.
| | - Ji Sook Han
- Department of Food Science and Nutrition, Pusan National University, Busan, 46241, Republic of Korea.
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3
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Wang B, Qin Y, Wu Q, Li X, Xie D, Zhao Z, Duan S. mTOR Signaling Pathway Regulates the Release of Proinflammatory Molecule CCL5 Implicated in the Pathogenesis of Autism Spectrum Disorder. Front Immunol 2022; 13:818518. [PMID: 35422816 PMCID: PMC9002353 DOI: 10.3389/fimmu.2022.818518] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 03/04/2022] [Indexed: 11/29/2022] Open
Abstract
Autism spectrum disorder (ASD) is a complex pervasive neurodevelopmental disorder and neuroinflammation may contribute to the pathogenesis of ASD. However, the exact mechanisms of abnormal release of proinflammatory mediators in ASD remain poorly understood. This study reports elevated plasma levels of the proinflammatory chemokine (C-C motif) ligand 5 (CCL5) in children with ASD, suggesting an aberrant inflammatory response appearing in the development of ASD. Mining of the expression data of brain or blood tissue from individuals with ASD reveals that mTOR signaling is aberrantly activated in ASD patients. Our in vitro study shows that suppression of mTOR reduces the gene expression and release of CCL5 from human microglia, supporting that CCL5 expression is regulated by mTOR activity. Furthermore, bacterial lipopolysaccharide (LPS)-induced CCL5 expression can be counteracted by siRNA against NF-κB, suggests a determining role of NF-κB in upregulating CCL5 expression. However, a direct regulatory relationship between the NF-κB element and the mTOR signaling pathway was not observed in rapamycin-treated cells. Our results show that the phosphorylated CREB can be induced to suppress CCL5 expression by outcompeting NF-κB in binding to CREB-binding protein (CREBBP) once the mTOR signaling pathway is inhibited. We propose that the activation of mTOR signaling in ASD may induce the suppression of phosphorylation of CREB, which in turn results in the increased binding of CREBBP to NF-κB, a competitor of phosphorylated CREB to drive expression of CCL5. Our study sheds new light on the inflammatory mechanisms of ASD and paves the way for the development of therapeutic strategy for ASD.
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Affiliation(s)
- Baojiang Wang
- Institute of Maternal and Child Medicine, Affiliated Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, China.,Laboratory of Medical Genetics, Shenzhen Health Development Research and Data Management Center, Shenzhen, China
| | - Yueyuan Qin
- Institute of Maternal and Child Medicine, Affiliated Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, China
| | - Qunyan Wu
- Institute of Maternal and Child Medicine, Affiliated Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, China
| | - Xi Li
- Laboratory of Medical Genetics, Shenzhen Health Development Research and Data Management Center, Shenzhen, China
| | - Dongying Xie
- Department of Biology, Faculty of Science, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China
| | - Zhongying Zhao
- Department of Biology, Faculty of Science, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China
| | - Shan Duan
- Institute of Maternal and Child Medicine, Affiliated Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, China
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Chen L, Li R, Chen F, Zhang H, Zhu Z, Xu S, Cheng Y, Zhao Y. A possible mechanism to the antidepressant-like effects of 20 (S)-protopanaxadiol based on its target protein 14-3-3 ζ. J Ginseng Res 2021; 46:666-674. [PMID: 36090685 PMCID: PMC9459030 DOI: 10.1016/j.jgr.2021.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 12/07/2021] [Accepted: 12/14/2021] [Indexed: 12/04/2022] Open
Abstract
Background Ginsenosides and their metabolites have antidepressant-like effects, but the underlying mechanisms remain unclear. We previously identified 14-3-3 ζ as one of the target proteins of 20 (S)-protopanaxadiol (PPD), a fully deglycosylated ginsenoside metabolite. Methods Corticosterone (CORT) was administered repeatedly to induce the depression model, and PPD was given concurrently. The tail suspension test (TST) and the forced swimming test (FST) were used for behavioral evaluation. All mice were sacrificed. Golgi-cox staining, GSK 3β activity assay, and Western blot analysis were performed. In vitro, the kinetic binding analysis with the Biolayer Interferometry (BLI) was used to determine the molecular interactions. Results TST and FST both revealed that PPD reversed CORT-induced behavioral deficits. PPD also ameliorated the CORT-induced expression alterations of hippocampal Ser9 phosphorylated glycogen synthase kinase 3β (p-Ser9 GSK 3β), Ser133 phosphorylated cAMP response element-binding protein (p-Ser133 CREB), and brain-derived neurotrophic factor (BDNF). Moreover, PPD attenuated the CORT-induced increase in GSK 3β activity and decrease in dendritic spine density in the hippocampus. In vitro, 14-3-3 ζ protein specifically bound to p-Ser9 GSK 3β polypeptide. PPD promoted the binding and subsequently decreased GSK 3β activity. Conclusion These findings demonstrated the antidepressant-like effects of PPD on the CORT-induced mouse depression model and indicated a possible target-based mechanism. The combination of PPD with the 14-3-3 ζ protein may promote the binding of 14-3-3 ζ to p-GSK 3β (Ser9) and enhance the inhibition of Ser9 phosphorylation on GSK 3β kinase activity, thereby activating the plasticity-related CREB–BDNF signaling pathway.
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Affiliation(s)
- Lin Chen
- Department of Physiology, School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Ruimei Li
- Department of Physiology, School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Feiyan Chen
- Research and Innovation Center, College of Traditional Chinese Medicine Integrated Chinese and Western Medicine College, Nanjing University of Chinese Medicine, Nanjing, China
| | - Hantao Zhang
- Department of Physiology, School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Zhu Zhu
- Department of Pathology and Pathophysiology, School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Shuyi Xu
- Department of Physiology, School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yao Cheng
- Department of Pathology and Pathophysiology, School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yunan Zhao
- Department of Pathology and Pathophysiology, School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
- Corresponding author. Department of Pathology and Pathophysiology, School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, 210023, China
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Graca FA, Sheffield N, Puppa M, Finkelstein D, Hunt LC, Demontis F. A large-scale transgenic RNAi screen identifies transcription factors that modulate myofiber size in Drosophila. PLoS Genet 2021; 17:e1009926. [PMID: 34780463 PMCID: PMC8629395 DOI: 10.1371/journal.pgen.1009926] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 11/29/2021] [Accepted: 11/04/2021] [Indexed: 02/07/2023] Open
Abstract
Myofiber atrophy occurs with aging and in many diseases but the underlying mechanisms are incompletely understood. Here, we have used >1,100 muscle-targeted RNAi interventions to comprehensively assess the function of 447 transcription factors in the developmental growth of body wall skeletal muscles in Drosophila. This screen identifies new regulators of myofiber atrophy and hypertrophy, including the transcription factor Deaf1. Deaf1 RNAi increases myofiber size whereas Deaf1 overexpression induces atrophy. Consistent with its annotation as a Gsk3 phosphorylation substrate, Deaf1 and Gsk3 induce largely overlapping transcriptional changes that are opposed by Deaf1 RNAi. The top category of Deaf1-regulated genes consists of glycolytic enzymes, which are suppressed by Deaf1 and Gsk3 but are upregulated by Deaf1 RNAi. Similar to Deaf1 and Gsk3 overexpression, RNAi for glycolytic enzymes reduces myofiber growth. Altogether, this study defines the repertoire of transcription factors that regulate developmental myofiber growth and the role of Gsk3/Deaf1/glycolysis in this process.
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Affiliation(s)
- Flavia A. Graca
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Natalie Sheffield
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Melissa Puppa
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - David Finkelstein
- Department of Computational Biology, St. Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Liam C. Hunt
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Fabio Demontis
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
- * E-mail:
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Chen B, Wang P, Liang X, Jiang C, Ge Y, Dworkin LD, Gong R. Permissive effect of GSK3β on profibrogenic plasticity of renal tubular cells in progressive chronic kidney disease. Cell Death Dis 2021; 12:432. [PMID: 33931588 PMCID: PMC8087712 DOI: 10.1038/s41419-021-03709-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 04/11/2021] [Accepted: 04/12/2021] [Indexed: 02/06/2023]
Abstract
Renal tubular epithelial cells (TECs) play a key role in renal fibrogenesis. After persistent injuries that are beyond self-healing capacity, TECs will dedifferentiate, undergo growth arrest, convert to profibrogenic phenotypes, and resort to maladaptive plasticity that ultimately results in renal fibrosis. Evidence suggests that glycogen synthase kinase (GSK) 3β is centrally implicated in kidney injury. However, its role in renal fibrogenesis is obscure. Analysis of publicly available kidney transcriptome database demonstrated that patients with progressive chronic kidney disease (CKD) exhibited GSK3β overexpression in renal tubulointerstitium, in which the predefined hallmark gene sets implicated in fibrogenesis were remarkably enriched. In vitro, TGF-β1 treatment augmented GSK3β expression in TECs, concomitant with dedifferentiation, cell cycle arrest at G2/M phase, excessive accumulation of extracellular matrix, and overproduction of profibrotic cytokines like PAI-1 and CTGF. All these profibrogenic phenotypes were largely abrogated by GSK3β inhibitors or by ectopic expression of a dominant-negative mutant of GSK3β but reinforced in cells expressing the constitutively active mutant of GSK3β. Mechanistically, GSK3β suppressed, whereas inhibiting GSK3β facilitated, the activity of cAMP response element-binding protein (CREB), which competes for CREB-binding protein, a transcriptional coactivator essential for TGF-β1/Smad signaling pathway to drive TECs profibrogenic plasticity. In vivo, in mice with folic acid-induced progressive CKD, targeting of GSK3β in renal tubules via genetic ablation or by microdose lithium mitigated the profibrogenic plasticity of TEC, concomitant with attenuated interstitial fibrosis and tubular atrophy. Collectively, GSK3β is likely a pragmatic therapeutic target for averting profibrogenic plasticity of TECs and improving renal fibrosis.
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Affiliation(s)
- Bohan Chen
- Division of Kidney Disease and Hypertension, Department of Medicine, Rhode Island Hospital, Brown University School of Medicine, Providence, RI, 02903, USA
- Division of Nephrology, Department of Medicine, University of Toledo College of Medicine, Toledo, OH, 43614, USA
| | - Pei Wang
- Division of Kidney Disease and Hypertension, Department of Medicine, Rhode Island Hospital, Brown University School of Medicine, Providence, RI, 02903, USA
| | - Xianhui Liang
- Division of Kidney Disease and Hypertension, Department of Medicine, Rhode Island Hospital, Brown University School of Medicine, Providence, RI, 02903, USA
| | - Chunming Jiang
- Division of Kidney Disease and Hypertension, Department of Medicine, Rhode Island Hospital, Brown University School of Medicine, Providence, RI, 02903, USA
| | - Yan Ge
- Division of Kidney Disease and Hypertension, Department of Medicine, Rhode Island Hospital, Brown University School of Medicine, Providence, RI, 02903, USA
- Division of Nephrology, Department of Medicine, University of Toledo College of Medicine, Toledo, OH, 43614, USA
| | - Lance D Dworkin
- Division of Kidney Disease and Hypertension, Department of Medicine, Rhode Island Hospital, Brown University School of Medicine, Providence, RI, 02903, USA
- Division of Nephrology, Department of Medicine, University of Toledo College of Medicine, Toledo, OH, 43614, USA
| | - Rujun Gong
- Division of Kidney Disease and Hypertension, Department of Medicine, Rhode Island Hospital, Brown University School of Medicine, Providence, RI, 02903, USA.
- Division of Nephrology, Department of Medicine, University of Toledo College of Medicine, Toledo, OH, 43614, USA.
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Rizk M, Saker Z, Harati H, Fares Y, Bahmad HF, Nabha S. Deciphering the roles of glycogen synthase kinase 3 (GSK3) in the treatment of autism spectrum disorder and related syndromes. Mol Biol Rep 2021; 48:2669-2686. [PMID: 33650079 DOI: 10.1007/s11033-021-06237-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2020] [Accepted: 02/12/2021] [Indexed: 02/08/2023]
Abstract
Autism spectrum disorder (ASD) is a complex and multifactorial neurodevelopmental disorder characterized by the presence of restricted interests and repetitive behaviors besides deficits in social communication. Syndromic ASD is a subset of ASD caused by underlying genetic disorders, most commonly Fragile X Syndrome (FXS) and Rett Syndrome (RTT). Various mutations and consequent malfunctions in core signaling pathways have been identified in ASD, including glycogen synthase kinase 3 (GSK3). A growing body of evidence suggests a key role of GSK3 dysregulation in the pathogenesis of ASD and its related disorders. Here, we provide a synopsis of the implication of GSK3 in ASD, FXS, and RTT as a promising therapeutic target for the treatment of ASD.
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Affiliation(s)
- Mahdi Rizk
- Neuroscience Research Center, Faculty of Medical Sciences, Lebanese University, Beirut, Lebanon
| | - Zahraa Saker
- Neuroscience Research Center, Faculty of Medical Sciences, Lebanese University, Beirut, Lebanon
| | - Hayat Harati
- Neuroscience Research Center, Faculty of Medical Sciences, Lebanese University, Beirut, Lebanon
| | - Youssef Fares
- Neuroscience Research Center, Faculty of Medical Sciences, Lebanese University, Beirut, Lebanon.,Department of Neurosurgery, Faculty of Medical Sciences, Lebanese University, Beirut, Lebanon
| | - Hisham F Bahmad
- Arkadi M. Rywlin M.D. Department of Pathology and Laboratory Medicine, Mount Sinai Medical Center, 4300 Alton Rd, Miami Beach, FL, 33140, USA
| | - Sanaa Nabha
- Neuroscience Research Center, Faculty of Medical Sciences, Lebanese University, Beirut, Lebanon.
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Gavagan M, Fagnan E, Speltz EB, Zalatan JG. The Scaffold Protein Axin Promotes Signaling Specificity within the Wnt Pathway by Suppressing Competing Kinase Reactions. Cell Syst 2020; 10:515-525.e5. [PMID: 32553184 DOI: 10.1016/j.cels.2020.05.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 04/02/2020] [Accepted: 05/15/2020] [Indexed: 10/24/2022]
Abstract
Scaffold proteins are thought to promote signaling specificity by accelerating reactions between bound kinase and substrate proteins. To test the long-standing hypothesis that the scaffold protein Axin accelerates glycogen synthase kinase 3β (GSK3β)-mediated phosphorylation of β-catenin in the Wnt signaling network, we measured GSK3β reaction rates with multiple substrates in a minimal, biochemically reconstituted system. We observed an unexpectedly small, ∼2-fold Axin-mediated rate increase for the β-catenin reaction when measured in isolation. In contrast, when both β-catenin and non-Wnt pathway substrates are present, Axin accelerates the β-catenin reaction by preventing competition with alternative substrates. At high competitor concentrations, Axin produces >10-fold rate effects. Thus, while Axin alone does not markedly accelerate the β-catenin reaction, in physiological settings where multiple GSK3β substrates are present, Axin may promote signaling specificity by suppressing interactions with competing, non-Wnt pathway targets. This mechanism for scaffold-mediated control of competition enables a shared kinase to perform distinct functions in multiple signaling networks.
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Affiliation(s)
- Maire Gavagan
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
| | - Erin Fagnan
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
| | - Elizabeth B Speltz
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
| | - Jesse G Zalatan
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA.
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Sanders O, Rajagopal L. Phosphodiesterase Inhibitors for Alzheimer's Disease: A Systematic Review of Clinical Trials and Epidemiology with a Mechanistic Rationale. J Alzheimers Dis Rep 2020; 4:185-215. [PMID: 32715279 PMCID: PMC7369141 DOI: 10.3233/adr-200191] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/17/2020] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Preclinical studies, clinical trials, and reviews suggest increasing 3',5'-cyclic adenosine monophosphate (cAMP) and 3',5'-cyclic guanosine monophosphate (cGMP) with phosphodiesterase inhibitors is disease-modifying in Alzheimer's disease (AD). cAMP/protein kinase A (PKA) and cGMP/protein kinase G (PKG) signaling are disrupted in AD. cAMP/PKA and cGMP/PKG activate cAMP response element binding protein (CREB). CREB binds mitochondrial and nuclear DNA, inducing synaptogenesis, memory, and neuronal survival gene (e.g., brain-derived neurotrophic factor) and peroxisome proliferator-activated receptor-γ coactivator-1α (PGC1α). cAMP/PKA and cGMP/PKG activate Sirtuin-1, which activates PGC1α. PGC1α induces mitochondrial biogenesis and antioxidant genes (e.g.,Nrf2) and represses BACE1. cAMP and cGMP inhibit BACE1-inducing NFκB and tau-phosphorylating GSK3β. OBJECTIVE AND METHODS We review efficacy-testing clinical trials, epidemiology, and meta-analyses to critically investigate whether phosphodiesteraseinhibitors prevent or treat AD. RESULTS Caffeine and cilostazol may lower AD risk. Denbufylline and sildenafil clinical trials are promising but preliminary and inconclusive. PF-04447943 and BI 409,306 are ineffective. Vinpocetine, cilostazol, and nicergoline trials are mixed. Deprenyl/selegiline trials show only short-term benefits. Broad-spectrum phosphodiesterase inhibitor propentofylline has been shown in five phase III trials to improve cognition, dementia severity, activities of daily living, and global assessment in mild-to-moderate AD patients on multiple scales, including the ADAS-Cogand the CIBIC-Plus in an 18-month phase III clinical trial. However, two books claimed based on a MedScape article an 18-month phase III trial failed, so propentofylline was discontinued. Now, propentofylline is used to treat canine cognitive dysfunction, which, like AD, involves age-associated wild-type Aβ deposition. CONCLUSION Phosphodiesterase inhibitors may prevent and treat AD.
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Mudgapalli N, Nallasamy P, Chava H, Chava S, Pathania AS, Gunda V, Gorantla S, Pandey MK, Gupta SC, Challagundla KB. The role of exosomes and MYC in therapy resistance of acute myeloid leukemia: Challenges and opportunities. Mol Aspects Med 2019; 70:21-32. [PMID: 31623866 PMCID: PMC7775410 DOI: 10.1016/j.mam.2019.10.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 09/27/2019] [Accepted: 10/06/2019] [Indexed: 12/12/2022]
Abstract
Acute myeloid leukemia (AML) is caused by abnormal production of white blood cells, red blood cells or platelets. The leukemia cells communicate with their microenvironment through nano-vesicle exosomes that are 30-100 nm in diameter. These nano-vesicles are released from body fluids upon fusion of an endocytic compartment with the cell membrane. Exosomes function as cargo to deliver signaling molecules to distant cells. This allows cross-talk between hematopoietic cells and other distant target cell environments. Exosomes support leukemia growth by acting as messengers between tumor cells and the microenvironment as well as inducing oncogenic factors such as c-Myc. Exosomes have also been used as biomarkers in the clinical diagnosis of leukemia. Glycogen synthase kinase-3 (GSK-3) and protein phosphatase 2A (PP2A) are two crucial signaling molecules involved in the AML pathogenesis and MYC stability. GSK-3 is a serine/threonine protein kinase that coordinates with over 40 different proteins during physiological/pathological conditions in blood cells. The dysregulation in GSK-3 has been reported during hematological malignancies. GSK-3 acts as a tumor suppressor by targeting c-MYC, MCL-1 and β-catenin. Conversely, GSK-3 can also act as tumor promoter in some instances. The pharmacological modulators of GSK-3 such as ABT-869, 6-Bromoindirubin-3'-oxime (BIO), GS-87 and LY2090314 have shown promise in the treatment of hematological malignancy. PP2A is a heterotrimeric serine/threonine phosphatase involved in the regulation of hematological malignancy. PP2A-activating drugs (PADs) can effectively antagonize leukemogenesis. The discovery of exosomes, kinase inhibitors and phosphatase activators have provided new hope to the leukemia patients. This review discusses the role of exosomes, GSK-3 and PP2A in the pathogenesis of leukemia. We provide evidence from both preclinical and clinical studies.
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Affiliation(s)
- Nithya Mudgapalli
- Department of Biochemistry and Molecular Biology, The Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
; UNMC Summer Undergraduate Research Program, University of Nebraska Medical Center, Omaha, NE, USA
| | - Palanisamy Nallasamy
- Department of Biochemistry and Molecular Biology, The Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
| | - Haritha Chava
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, USA
| | - Srinivas Chava
- Department of Biochemistry and Molecular Biology, The Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
| | - Anup S Pathania
- Department of Biochemistry and Molecular Biology, The Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
| | - Venugopal Gunda
- Pediatric Oncology Laboratory, Child Health Research Institute, University of Nebraska Medical Center, Omaha, NE, USA
| | - Santhi Gorantla
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, USA
| | - Manoj K Pandey
- Department of Biomedical Sciences, Cooper Medical School of Rowan University, Camden, NJ, USA
| | - Subash C Gupta
- Laboratory for Translational Cancer Research, Department of Biochemistry, Institute of Science, Banaras Hindu University, Varanasi, 221 005, India
| | - Kishore B Challagundla
- Department of Biochemistry and Molecular Biology, The Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
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Xie J, Wang X, Ge H, Peng F, Zheng N, Wang Q, Tao L. Cx32 mediates norepinephrine-promoted EGFR-TKI resistance in a gap junction-independent manner in non-small-cell lung cancer. J Cell Physiol 2019; 234:23146-23159. [PMID: 31152452 DOI: 10.1002/jcp.28881] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2019] [Revised: 05/07/2019] [Accepted: 05/09/2019] [Indexed: 01/10/2023]
Abstract
The second-generation EGFR-TKI Afatinib is an irreversible ErbB family blocker used to treat patients with non-small-cell lung cancer (NSCLC). Unfortunately, resistance to this drug develops over time, and patients are always under great psychological pressure. A previous study showed that chronic stress hormones participate in EGFR-TKI resistance via β2 -AR signaling via an IL-6 dependent mechanism. Our study further explores a novel potential underlying mechanism. In the present study, we show that the stress hormone norepinephrine (NE) promotes Afatinib resistance by upregulating Cx32 expression. Furthermore, we, for the first time, find that Cx32 is a target gene for transcription factor CREB and NE enhances Cx32 mRNA expression by activation of CREB. We also demonstrate that Cx32 promotes Afatinib resistance by decreasing the degradation of EGFR-TKI resistance-associated proteins (MET, IGF-1R) and by increasing their transcription levels. Together, these results reveal that the stress hormone NE accelerates Afatinib resistance by increasing the expression of Cx32, which augments MET and IGF-1R levels in cancer cells and provides a promising therapeutic strategy against EGFR-TKI Afatinib resistance in NSCLC.
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Affiliation(s)
- Jie Xie
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
| | - Xiyan Wang
- Tumor Research Institute, Xinjiang Medical University Affiliated Tumor Hospital, Urumqi, Xinjiang, China
| | - Hui Ge
- Tumor Research Institute, Xinjiang Medical University Affiliated Tumor Hospital, Urumqi, Xinjiang, China
| | - Fuhua Peng
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
| | - Ningze Zheng
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
| | - Qin Wang
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
| | - Liang Tao
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
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12
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Li Q, Wang P, Huang C, Chen B, Liu J, Zhao M, Zhao J. N-Acetyl Serotonin Protects Neural Progenitor Cells Against Oxidative Stress-Induced Apoptosis and Improves Neurogenesis in Adult Mouse Hippocampus Following Traumatic Brain Injury. J Mol Neurosci 2019; 67:574-588. [PMID: 30684239 DOI: 10.1007/s12031-019-01263-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 01/17/2019] [Indexed: 01/01/2023]
Abstract
In this study, with primary mouse neural progenitor cells (NPCs), we investigated the neuroprotective effect of a tropomyosin-related kinase receptor B (TrkB) agonist, N-acetyl serotonin (NAS), against hydrogen peroxide (H2O2)-induced toxicity. We found that pre-incubation with NAS not only ameliorates H2O2-induced cell viability loss, lactate dehydrogenase (LDH) release, and proliferative and migratory capacity impairments, but counteracts H2O2-triggered production of nitric oxide (NO), reactive oxygen species (ROS), malondialdehyde (MDA), and 8-hydroxy-deoxyguanosine (8-OHdG) in a dose-dependent manner. Additionally, pre-treatment with NAS was able to attenuate H2O2-induced apoptosis in NPCs, evidenced by the decreased percentage of apoptotic cells and altered expression of apoptosis-related factors. Furthermore, in differentiated NPCs, NAS improves H2O2-induced reduction in neurite growth. Mechanistic studies revealed that the protective effects of NAS in NPCs may be mediated by the TrkB/PI3K/Akt/ cAMP response element binding protein (CREB) signaling cascades. In a mouse traumatic brain injury (TBI) model, we found that systemic administration of 30 mg/kg NAS could improve hippocampal neurogenesis, manifested by the increased number of SOX-2-positive cells and increased expression of phosphorylated CREB in the dentate gyrus (DG) area. Treatment with NAS also ameliorates cognitive impairments caused by TBI, as assessed by Y-maze and contextual and cued fear conditioning tests. Taken together, these results provide valuable insights into the neuroprotective and neuroregenerative effects of NAS, suggesting it may have therapeutic potential for the treatment of TBI.
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Affiliation(s)
- Qingzhi Li
- Department of Neurosurgery, Hainan General Hospital, 19 Xiuhua Road, Xiuying District, Haikou, 570311, Hainan Province, China
| | - Pengcheng Wang
- Department of Neurosurgery, Hainan General Hospital, 19 Xiuhua Road, Xiuying District, Haikou, 570311, Hainan Province, China
| | - Chuixue Huang
- Department of Neurosurgery, Hainan General Hospital, 19 Xiuhua Road, Xiuying District, Haikou, 570311, Hainan Province, China
| | - Baozhi Chen
- Department of Neurosurgery, Hainan General Hospital, 19 Xiuhua Road, Xiuying District, Haikou, 570311, Hainan Province, China
| | - Jiabin Liu
- Department of Radiotherapy, Nanfang Hospital of Southern Medical University, Guangzhou, China
| | - Mingmei Zhao
- Department of Neurosurgery, the Affiliated Hospital of Medical College, Qingdao University, Qingdao, China
| | - Jiannong Zhao
- Department of Neurosurgery, Hainan General Hospital, 19 Xiuhua Road, Xiuying District, Haikou, 570311, Hainan Province, China.
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13
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Suber TL, Nikolli I, O'Brien ME, Londino J, Zhao J, Chen K, Mallampalli RK, Zhao Y. FBXO17 promotes cell proliferation through activation of Akt in lung adenocarcinoma cells. Respir Res 2018; 19:206. [PMID: 30359271 PMCID: PMC6203195 DOI: 10.1186/s12931-018-0910-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Accepted: 10/09/2018] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND The ubiquitin-proteasome pathway, mediated in part, by ubiquitin E3 ligases, is critical in regulating cellular processes such as cell proliferation, apoptosis, and migration. FBXO17 was recently identified as an F-box protein that targets glycogen synthase kinase-3β to the E3 ubiquitin ligase protein complex for polyubiquitination and proteasomal degradation. Here, we identified that in several lung adenocarcinoma cell lines, FBXO17 cellular protein was detected at relatively high levels, as was expression in a subset of lung cancers. Hence, we investigated the effects of FBXO17 on cell proliferation. METHODS Single cell RNA sequencing analysis was performed on a resection of a non-small cell lung carcinoma tumor to examine FBXO17 expression. Multiple lung cancer cell lines were immunoblotted, and The Cancer Genome Atlas was analyzed to determine if FBXO17 expression was amplified in a subset of lung cancers. A549 cells were transfected with empty vector or FBXO17-V5 plasmid and immunoblotted for Akt pathway mediators including PDK1, ERK1/2, ribosomal protein S6, and CREB. Cell proliferation and viability were analyzed by trypan blue exclusion, BrdU incorporation and an MTS-based fluorometric assay. Studies were also performed after transfecting with sifbxo17. Samples were used in an RNA microarray analysis to evaluate pathways affected by reduced FBXO17 gene expression. RESULTS We observed that overexpression of FBXO17 increased A549 cell proliferation coupled with Akt activation. Ectopically expressed FBXO17 also increased ERK1/2 kinase activation and increased phosphorylation of RPS6, a downstream target of mTOR. We also observed an increased number of cells in S-phase and increased metabolic activity of lung epithelial cells expressing FBXO17. FBXO17 knockdown reduced Akt Ser 473 phosphorylation approaching statistical significance with no effect on Thr 308. However, ERK1/2 phosphorylation, cellular metabolic activity, and overall cell numbers were reduced. When we analyzed RNA profiles of A549 cells with reduced FBXO17 expression, we observed downregulation of several genes associated with cell proliferation and metabolism. CONCLUSIONS These data support a role for FBXO17 abundance, when left unchecked, in regulating cell proliferation and survival through modulation of Akt and ERK kinase activation. The data raise a potential role for the F-box subunit in modulating tumorigenesis.
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Affiliation(s)
- Tomeka L Suber
- Department of Medicine, the Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Department of Medicine, Pulmonary, Allergy, & Critical Care Medicine, The University of Pittsburgh, UPMC Montefiore, NW 628, Pittsburgh, PA, 15213, USA
| | - Ina Nikolli
- Department of Medicine, the Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Department of Medicine, Pulmonary, Allergy, & Critical Care Medicine, The University of Pittsburgh, UPMC Montefiore, NW 628, Pittsburgh, PA, 15213, USA
| | - Michael E O'Brien
- Department of Medicine, the Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Department of Medicine, Pulmonary, Allergy, & Critical Care Medicine, The University of Pittsburgh, UPMC Montefiore, NW 628, Pittsburgh, PA, 15213, USA
| | - James Londino
- Department of Medicine, the Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Department of Medicine, Pulmonary, Allergy, & Critical Care Medicine, The University of Pittsburgh, UPMC Montefiore, NW 628, Pittsburgh, PA, 15213, USA
| | - Jing Zhao
- Department of Medicine, the Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Department of Medicine, Pulmonary, Allergy, & Critical Care Medicine, The University of Pittsburgh, UPMC Montefiore, NW 628, Pittsburgh, PA, 15213, USA
| | - Kong Chen
- Department of Medicine, the Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Department of Medicine, Pulmonary, Allergy, & Critical Care Medicine, The University of Pittsburgh, UPMC Montefiore, NW 628, Pittsburgh, PA, 15213, USA
| | - Rama K Mallampalli
- Department of Medicine, the Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, 15213, USA. .,Department of Cell Biology, Physiology, and Bioengineering, University of Pittsburgh, Pittsburgh, PA, 15213, USA. .,Medical Specialty Service Line, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, PA, 15240, USA. .,Department of Medicine, Pulmonary, Allergy, & Critical Care Medicine, The University of Pittsburgh, UPMC Montefiore, NW 628, Pittsburgh, PA, 15213, USA.
| | - Yutong Zhao
- Department of Medicine, the Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, 15213, USA. .,Department of Medicine, Pulmonary, Allergy, & Critical Care Medicine, The University of Pittsburgh, UPMC Montefiore, NW 628, Pittsburgh, PA, 15213, USA.
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14
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Zhou H, Wang H, Ni M, Yue S, Xia Y, Busuttil RW, Kupiec-Weglinski JW, Lu L, Wang X, Zhai Y. Glycogen synthase kinase 3β promotes liver innate immune activation by restraining AMP-activated protein kinase activation. J Hepatol 2018; 69:99-109. [PMID: 29452207 PMCID: PMC6291010 DOI: 10.1016/j.jhep.2018.01.036] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 01/08/2018] [Accepted: 01/30/2018] [Indexed: 12/22/2022]
Abstract
BACKGROUND & AIMS Glycogen synthase kinase 3β (Gsk3β [Gsk3b]) is a ubiquitously expressed kinase with distinctive functions in different types of cells. Although its roles in regulating innate immune activation and ischaemia and reperfusion injuries (IRIs) have been well documented, the underlying mechanisms remain ambiguous, in part because of the lack of cell-specific tools in vivo. METHODS We created a myeloid-specific Gsk3b knockout (KO) strain to study the function of Gsk3β in macrophages in a murine liver partial warm ischaemia model. RESULTS Compared with controls, myeloid Gsk3b KO mice were protected from IRI, with diminished proinflammatory but enhanced anti-inflammatory immune responses in livers. In bone marrow-derived macrophages, Gsk3β deficiency resulted in an early reduction of Tnf gene transcription but sustained increase of Il10 gene transcription on Toll-like receptor 4 stimulation in vitro. These effects were associated with enhanced AMP-activated protein kinase (AMPK) activation, which led to an accelerated and higher level of induction of the novel innate immune negative regulator small heterodimer partner (SHP [Nr0b2]). The regulatory function of Gsk3β on AMPK activation and SHP induction was confirmed in wild-type bone marrow-derived macrophages with a Gsk3 inhibitor. Furthermore, we found that this immune regulatory mechanism was independent of Gsk3β Ser9 phosphorylation and the phosphoinositide 3-kinase-Akt signalling pathway. In vivo, myeloid Gsk3β deficiency facilitated SHP upregulation by ischaemia-reperfusion in liver macrophages. Treatment of Gsk3b KO mice with either AMPK inhibitor or SHP small interfering RNA before the onset of liver ischaemia restored liver proinflammatory immune activation and IRI in these otherwise protected hosts. Additionally, pharmacological activation of AMPK protected wild-type mice from liver IRI, with reduced proinflammatory immune activation. Inhibition of the AMPK-SHP pathway by liver ischaemia was demonstrated in tumour resection patients. CONCLUSIONS Gsk3β promotes innate proinflammatory immune activation by restraining AMPK activation. LAY SUMMARY Glycogen synthase kinase 3β promotes macrophage inflammatory activation by inhibiting the immune regulatory signalling of AMP-activated protein kinase and the induction of small heterodimer partner. Therefore, therapeutic targeting of glycogen synthase kinase 3β enhances innate immune regulation and protects liver from ischaemia and reperfusion injury.
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Affiliation(s)
- Haoming Zhou
- Dumont-UCLA Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at the University of California, Los Angeles, CA, USA; Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Han Wang
- Dumont-UCLA Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at the University of California, Los Angeles, CA, USA; Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Ming Ni
- Dumont-UCLA Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at the University of California, Los Angeles, CA, USA; Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Shi Yue
- Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Yongxiang Xia
- Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Ronald W Busuttil
- Dumont-UCLA Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at the University of California, Los Angeles, CA, USA
| | - Jerzy W Kupiec-Weglinski
- Dumont-UCLA Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at the University of California, Los Angeles, CA, USA
| | - Ling Lu
- Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Xuehao Wang
- Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China.
| | - Yuan Zhai
- Dumont-UCLA Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at the University of California, Los Angeles, CA, USA.
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15
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Lin L, Cao J, Yang S, Fu Z, Zeng P, Chu J, Ning L, Zhang T, Shi Y, Tian Q, Zhou X, Wang J. Endoplasmic reticulum stress induces spatial memory deficits by activating GSK-3. J Cell Mol Med 2018; 22:3489-3502. [PMID: 29675957 PMCID: PMC6010738 DOI: 10.1111/jcmm.13626] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 03/11/2018] [Indexed: 12/17/2022] Open
Abstract
Endoplasmic reticulum (ER) stress is involved in Alzheimer's disease (AD), but the mechanism is not fully understood. Here, we injected tunicamycin (TM), a recognized ER stress inducer, into the brain ventricle of Sprague-Dawley (SD) rats to induce the unfolded protein response (UPR), demonstrated by the enhanced phosphorylation of pancreatic ER kinase (PERK), inositol-requiring enzyme-1 (IRE-1) and activating transcription factor-6 (ATF-6). We observed that UPR induced spatial memory deficits and impairments of synaptic plasticity in the rats. After TM treatment, GSK-3β was activated and phosphorylation of cAMP response element binding protein at Ser129 (pS129-CREB) was increased with an increased nuclear co-localization of pY126-GSK-3β and pS129-CREB. Simultaneous inhibition of GSK-3β by hippocampal infusion of SB216763 (SB) attenuated TM-induced UPR and spatial memory impairment with restoration of pS129-CREB and synaptic plasticity. We concluded that UPR induces AD-like spatial memory deficits with mechanisms involving GSK-3β/pS129-CREB pathway.
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Affiliation(s)
- Li Lin
- Department of PathophysiologySchool of Basic Medicine and the Collaborative Innovation Center for Brain ScienceKey Laboratory of Ministry of Education of China and Hubei Province for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
- Cell Molecular Biology Laboratory of Basic Medical CollegeHubei University of Chinese MedicineWuhanChina
| | - Jie Cao
- Department of PathophysiologySchool of Basic Medicine and the Collaborative Innovation Center for Brain ScienceKey Laboratory of Ministry of Education of China and Hubei Province for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Shu‐Sheng Yang
- Department of Traditional Chinese MedicineWuhan Red Cross HospitalWuhanChina
| | - Zheng‐Qi Fu
- Department of PathophysiologySchool of Basic Medicine and the Collaborative Innovation Center for Brain ScienceKey Laboratory of Ministry of Education of China and Hubei Province for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
- Present address:
Department of Pathology and PathophysiologySchool of MedicineJianghan UniversityWuhanChina
| | - Peng Zeng
- Department of PathophysiologySchool of Basic Medicine and the Collaborative Innovation Center for Brain ScienceKey Laboratory of Ministry of Education of China and Hubei Province for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Jiang Chu
- Department of PathophysiologySchool of Basic Medicine and the Collaborative Innovation Center for Brain ScienceKey Laboratory of Ministry of Education of China and Hubei Province for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Lin‐Na Ning
- Department of PathophysiologySchool of Basic Medicine and the Collaborative Innovation Center for Brain ScienceKey Laboratory of Ministry of Education of China and Hubei Province for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Teng Zhang
- Department of PathophysiologySchool of Basic Medicine and the Collaborative Innovation Center for Brain ScienceKey Laboratory of Ministry of Education of China and Hubei Province for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Yan Shi
- Department of PathophysiologySchool of Basic Medicine and the Collaborative Innovation Center for Brain ScienceKey Laboratory of Ministry of Education of China and Hubei Province for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Qing Tian
- Department of PathophysiologySchool of Basic Medicine and the Collaborative Innovation Center for Brain ScienceKey Laboratory of Ministry of Education of China and Hubei Province for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Xin‐Wen Zhou
- Department of PathophysiologySchool of Basic Medicine and the Collaborative Innovation Center for Brain ScienceKey Laboratory of Ministry of Education of China and Hubei Province for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Jian‐Zhi Wang
- Department of PathophysiologySchool of Basic Medicine and the Collaborative Innovation Center for Brain ScienceKey Laboratory of Ministry of Education of China and Hubei Province for Neurological DisordersTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
- Co‐innovation Center of NeuroregenerationNantong UniversityNantongChina
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16
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Zhuang S, Hua X, He K, Zhou T, Zhang J, Wu H, Ma X, Xia Q, Zhang J. Inhibition of GSK‐3β induces AP‐1‐mediated osteopontin expression to promote cholestatic liver fibrosis. FASEB J 2018. [DOI: 10.1096/fj.201701137r] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Shaoyong Zhuang
- Department of Liver SurgeryShanghai Jiao‐Tong UniversityShanghaiChina
- Liver Transplantation CenterShanghai Jiao‐Tong UniversityShanghaiChina
| | - Xiangwei Hua
- Division of Gastroenterology and HepatologyShanghai Institute of Digestive DiseaseRen Ji HospitalSchool of MedicineShanghai Jiao‐Tong UniversityShanghaiChina
| | - Kang He
- Department of Liver SurgeryShanghai Jiao‐Tong UniversityShanghaiChina
- Liver Transplantation CenterShanghai Jiao‐Tong UniversityShanghaiChina
| | - Tao Zhou
- Department of Liver SurgeryShanghai Jiao‐Tong UniversityShanghaiChina
- Liver Transplantation CenterShanghai Jiao‐Tong UniversityShanghaiChina
| | - Jiang Zhang
- Key Laboratory of Gastroenterology and HepatologyMinistry of HealthShanghai Jiao‐Tong UniversityShanghaiChina
| | - Haoyu Wu
- Department of Liver SurgeryShanghai Jiao‐Tong UniversityShanghaiChina
- Liver Transplantation CenterShanghai Jiao‐Tong UniversityShanghaiChina
| | - Xiong Ma
- Institute of Transplantation ScienceThe Affiliated Hospital of Qingdao UniversityShandongChina
- Department of Medicine IIUniversity of Munich‐Campus GrosshadernMunichGermany
| | - Qiang Xia
- Department of Liver SurgeryShanghai Jiao‐Tong UniversityShanghaiChina
- Liver Transplantation CenterShanghai Jiao‐Tong UniversityShanghaiChina
| | - Jianjun Zhang
- Department of Liver SurgeryShanghai Jiao‐Tong UniversityShanghaiChina
- Liver Transplantation CenterShanghai Jiao‐Tong UniversityShanghaiChina
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Ren Z, Xie Z, Cao D, Gong M, Yang L, Zhou Z, Ou Y. C-Phycocyanin inhibits hepatic gluconeogenesis and increases glycogen synthesis via activating Akt and AMPK in insulin resistance hepatocytes. Food Funct 2018; 9:2829-2839. [DOI: 10.1039/c8fo00257f] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The mechanism of C-PC in improving glucose homoeostasis is to activate the IRS/PI3 K/Akt and SIRT1/LKB1/AMPK signaling pathway in insulin resistant hepatocytes.
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Affiliation(s)
- Zhiheng Ren
- School of Life Science and Technology
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Zhifei Xie
- School of Life Science and Technology
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Danni Cao
- School of Life Science and Technology
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Mufeng Gong
- School of Life Science and Technology
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Lei Yang
- School of Life Science and Technology
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Zhu Zhou
- Department of Pharmaceutics and Medicinal Chemistry
- University of the Pacific
- Stockton 95211CA
- USA
| | - Yu Ou
- School of Life Science and Technology
- China Pharmaceutical University
- Nanjing 210009
- China
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18
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Gu X, Liu L, Shen Q, Xing D. Photoactivation of ERK/CREB/VMAT2 pathway attenuates MPP + -induced neuronal injury in a cellular model of Parkinson's disease. Cell Signal 2017. [DOI: 10.1016/j.cellsig.2017.06.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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19
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Hermida MA, Dinesh Kumar J, Leslie NR. GSK3 and its interactions with the PI3K/AKT/mTOR signalling network. Adv Biol Regul 2017; 65:5-15. [PMID: 28712664 DOI: 10.1016/j.jbior.2017.06.003] [Citation(s) in RCA: 282] [Impact Index Per Article: 40.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 06/23/2017] [Indexed: 01/01/2023]
Abstract
Glycogen Synthase Kinase-3 (GSK3 or GSK-3) is a promiscuous protein kinase and its phosphorylation of its diverse substrates has major influences on many areas of physiology and pathology, including cellular metabolism, lineage commitment and neuroscience. GSK3 was one of the first identified substrates of the heavily studied oncogenic kinase AKT, phosphorylation by which inhibits GSK3 activity via the formation of an autoinhibitory pseudosubstrate sequence. This has led to investigation of the role of GSK3 inhibition as a key component of the cellular responses to growth factors and insulin, which stimulate the class I PI 3-Kinases and in turn AKT activity and GSK3 phosphorylation. GSK3 has been shown to phosphorylate several upstream and downstream components of the PI3K/AKT/mTOR signalling network, including AKT itself, RICTOR, TSC1 and 2, PTEN and IRS1 and 2, with the potential to apply feedback control within the network. However, it has been clear for some time that functionally distinct, insulated pools of GSK3 exist which are regulated independently, so that for some GSK3 substrates such as β-catenin, phosphorylation by GSK3 is not controlled by input from PI3K and AKT. Instead, as almost all GSK3 substrates require a priming phosphorylated residue to be 4 amino acids C-terminal to the Ser/Thr phosphorylated by GSK3, the predominant form of regulation of the activity of GSK3 often appears to be through control over these priming events, specific to individual substrates. Therefore, a major role of GSK3 can be viewed as an amplifier of the electrostatic effects on protein function which are caused by these priming phosphorylation events. Here we discuss these different aspects to GSK3 regulation and function, and the functions of GSK3 as it integrates with signalling through the PI3K-AKT-mTOR signalling axis.
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Affiliation(s)
- Miguel A Hermida
- Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Sciences, Heriot Watt University, Edinburgh EH14 4AS, UK
| | - J Dinesh Kumar
- Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Sciences, Heriot Watt University, Edinburgh EH14 4AS, UK
| | - Nick R Leslie
- Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Sciences, Heriot Watt University, Edinburgh EH14 4AS, UK.
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Glycogen synthase kinase 3β and cyclin D1 expression in cervical carcinogenesis. Obstet Gynecol Sci 2016; 59:470-478. [PMID: 27896249 PMCID: PMC5120066 DOI: 10.5468/ogs.2016.59.6.470] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 06/14/2016] [Accepted: 07/07/2016] [Indexed: 12/20/2022] Open
Abstract
Objective Glycogen synthase kinase 3β (GSK3β) is a pluripotent protein kinase involved in the development of cancers through regulation of numerous oncogenic molecules. Cyclin D1, an important regulator of G1 to S phase transition in various cells, is one of target proteins that GSK3β regulate. Our objective was to assess the expression of GSK3β and cyclin D1 in cervical neoplasm of different histologic grades and to identify their correlation in cervical carcinogenesis. Methods Immunohistochemical analysis of GSK3β and cyclin D1 was performed in a total of 137 patients with 12 normal, 62 cervical intraepithelial neoplasia (CIN) (31 CIN1 and 31 CIN3) and 63 invasive cancers including 56 squamous cell carcinomas and 7 adenocarcinomas. Results The expression of GSK3β increased in parallel with the lesion grade, while that of cyclin D1 decreased with severity of the lesion (P<0.001). There was a significant inverse correlation between GSK3β and cyclin D1 expression in overall cervical neoplasia (Φ=-0.413, P<0.001). GSK3β expression was higher in squamous cell carcinoma than in adenocarcinoma (P=0.049). Conclusion These results suggest that the expressional increase in GSK3β plays a role in cervical carcinogenesis and has inverse correlation with cyclin D1 expression in this process. In addition, GSK3β expression appears to be associated with the histologic type of cervical cancer, especially squamous cell carcinoma.
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Wang Y, Wang Y, Zhong T, Guo J, Li L, Zhang H, Wang L. Transcriptional regulation of pig GYS1 gene by glycogen synthase kinase 3β (GSK3β). Mol Cell Biochem 2016; 424:203-208. [PMID: 27785702 DOI: 10.1007/s11010-016-2856-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 10/22/2016] [Indexed: 01/02/2023]
Abstract
Glycogen synthase kinase 3β (GSK3β) is a ubiquitous serine/threonine kinase and has important roles in glycogen metabolism biosynthesis. Studies have revealed that GSK3β can directly regulate the glycogen synthase activity, yet little is known about the regulation of GSK3β on GYS1 gene transcription. Here, we show that overexpression of GSK3β decreased the mRNA expression level of GYS1. Then we cloned approximately 1.5 kb of pig GYS1 gene promoter region, generated sequential deletion constructs, and evaluated their activity. A gradual increase of the promoter activity was seen with increasing length of the promoter sequence, reaching its highest activity to the sequence corresponding to nt -350 to +224, and then decreased. However, the activities of constructed promoter fragments show different responses to GSK3β co-transfection. By analyzing a series of GYS1 promoter reporter constructs, we have defined two crucial regions (-1488 to -539, -350 to -147) that are responsible for GSK3β-induced transcriptional repression. Furthermore, the ChIP results revealed that only the first and second NF-κB sites of GYS1 promoter could bind to p65, and overexpression of GSK3β induced a significant decrease in p65 binding to the second NF-κB binding site, suggesting that GSK3β may regulate expression of GYS1 gene through binding to the second rather than the first NF-κB site. These data suggest that the NF-κB plays important roles in the transcriptional activity of pig GYS1 gene regulated by GSK3β.
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Affiliation(s)
- Yilin Wang
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China.,Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China
| | - Yan Wang
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China.,Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China
| | - Tao Zhong
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China.,Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China
| | - Jiazhong Guo
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China.,Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China
| | - Li Li
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China.,Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China
| | - Hongping Zhang
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China.,Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China
| | - Linjie Wang
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China. .,Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China.
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Glycogen Synthase Kinase-3 is involved in glycogen metabolism control and embryogenesis of Rhodnius prolixus. Parasitology 2016; 143:1569-79. [DOI: 10.1017/s0031182016001487] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
SUMMARYRhodnius prolixus is a blood-feeding insect that transmits Trypanosoma cruzi and Trypanosoma rangeli to vertebrate hosts. Rhodnius prolixus is also a classical model in insect physiology, and the recent availability of R. prolixus genome has opened new avenues on triatomine research. Glycogen synthase kinase 3 (GSK-3) is classically described as a key enzyme involved in glycogen metabolism, also acting as a downstream component of the Wnt pathway during embryogenesis. GSK-3 has been shown to be highly conserved among several organisms, mainly in the catalytic domain region. Meanwhile, the role of GSK-3 during R. prolixus embryogenesis or glycogen metabolism has not been investigated. Here we show that chemical inhibition of GSK-3 by alsterpaullone, an ATP-competitive inhibitor of GSK3, does not affect adult survival rate, though it alters oviposition and egg hatching. Specific GSK-3 gene silencing by dsRNA injection in adult females showed a similar phenotype. Furthermore, bright field and 4’−6-diamidino-2-phenylindole (DAPI) staining analysis revealed that ovaries and eggs from dsGSK-3 injected females exhibited specific morphological defects. We also demonstrate that glycogen content was inversely related to activity and transcription levels of GSK-3 during embryogenesis. Lastly, after GSK-3 knockdown, we observed changes in the expression of the Wingless (Wnt) downstream target β-catenin as well as in members of other pathways such as the receptor Notch. Taken together, our results show that GSK-3 regulation is essential for R. prolixus oogenesis and embryogenesis.
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Kakade VR, Tao S, Rajagopal M, Zhou X, Li X, Yu ASL, Calvet JP, Pandey P, Rao R. A cAMP and CREB-mediated feed-forward mechanism regulates GSK3β in polycystic kidney disease. J Mol Cell Biol 2016; 8:464-476. [PMID: 27190311 DOI: 10.1093/jmcb/mjw022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 02/05/2016] [Accepted: 02/28/2016] [Indexed: 12/12/2022] Open
Abstract
Glycogen synthase kinase 3β (GSK3β), a serine/threonine protein kinase, is commonly known to be regulated at the level of its activity. However, in some diseases including polycystic kidney disease (PKD), GSK3β expression is increased and plays a pathophysiological role. The current studies aimed to determine the mechanism for the increased GSK3β expression in PKD and its significance to disease progression. In mouse models of PKD, increases in renal GSK3β corresponded with increases in renal cAMP levels and disease progression. In vivo and in vitro studies revealed that GSK3β is a cAMP-responsive gene, and elevated cAMP levels, as seen in PKD, can increase GSK3β expression. In normal mice, vasopressin signaling induced by water deprivation increased GSK3β expression, which decreased following rehydration. Examination of the GSK3β promoter revealed five potential binding sites for the transcription factor, cAMP response element binding protein (CREB). CREB was found to bind to GSK3β promoter and essential for cAMP-mediated regulation of GSK3β. Importantly, this regulation was demonstrated to be part of a feed-forward loop in which cAMP through CREB regulates GSK3β expression, and GSK3β in turn positively regulates cAMP generation. GSK3β or CREB inhibition reduced transepithelial fluid secretion and cyst expansion in vitro Thus, disruption at any point of this destructive cycle may be therapeutically useful to reduce cyst expansion and preserve renal function in PKD.
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Affiliation(s)
- Vijayakumar R Kakade
- The Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Shixin Tao
- The Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Madhumitha Rajagopal
- The Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Xia Zhou
- The Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Xiaogang Li
- The Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Alan S L Yu
- The Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - James P Calvet
- The Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Pankaj Pandey
- The Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Reena Rao
- The Kidney Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA
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Park SA, Lee JW, Herbst RS, Koo JS. GSK-3α Is a Novel Target of CREB and CREB-GSK-3α Signaling Participates in Cell Viability in Lung Cancer. PLoS One 2016; 11:e0153075. [PMID: 27049759 PMCID: PMC4822949 DOI: 10.1371/journal.pone.0153075] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Accepted: 03/23/2016] [Indexed: 01/03/2023] Open
Abstract
Overexpression or activation of cyclic AMP-response element-binding protein (CREB) has been known to be involved in several human malignancies, including lung cancer. Genes regulated by CREB have been reported to suppress apoptosis, induce cell proliferation, inflammation, and tumor metastasis. However, the critical target genes of CREB in lung cancer have not been well understood. Here, we identified GSK-3α as one of the CREB target genes which is critical for the viability of lung cancer cells. The CREB knockdown significantly reduced the expression of GSK-3α and the direct binding of CREB on the promoter of GSK3A was identified. Kaplan-Meier analysis with a public database showed a prognostic significance of aberrant GSK-3α expression in lung cancer. Inhibition of GSK-3α suppressed cell viability, colony formation, and tumor growth. For the first time, we demonstrated that GSK-3α is regulated by CREB in lung cancer and is required for the cell viability. These findings implicate CREB-GSK-3α axis as a novel therapeutic target for lung cancer treatment.
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Affiliation(s)
- Sin-Aye Park
- Section of Medical Oncology, Department of Internal Medicine, Yale Comprehensive Cancer Center, Yale School of Medicine, New Haven, Connecticut, 06520, United States of America
| | - Jong Woo Lee
- Section of Medical Oncology, Department of Internal Medicine, Yale Comprehensive Cancer Center, Yale School of Medicine, New Haven, Connecticut, 06520, United States of America
| | - Roy S. Herbst
- Section of Medical Oncology, Department of Internal Medicine, Yale Comprehensive Cancer Center, Yale School of Medicine, New Haven, Connecticut, 06520, United States of America
| | - Ja Seok Koo
- Section of Medical Oncology, Department of Internal Medicine, Yale Comprehensive Cancer Center, Yale School of Medicine, New Haven, Connecticut, 06520, United States of America
- Developmental Therapeutics, Translational Research Program, Yale Comprehensive Cancer Center, New Haven, Connecticut, 06520, United States of America
- * E-mail:
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Repeated Three-Hour Maternal Separation Induces Depression-Like Behavior and Affects the Expression of Hippocampal Plasticity-Related Proteins in C57BL/6N Mice. Neural Plast 2015; 2015:627837. [PMID: 26798520 PMCID: PMC4700195 DOI: 10.1155/2015/627837] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2015] [Revised: 08/12/2015] [Accepted: 08/19/2015] [Indexed: 11/17/2022] Open
Abstract
Adverse early life experiences can negatively affect behaviors later in life. Maternal separation (MS) has been extensively investigated in animal models in the adult phase of MS. The study aimed to explore the mechanism by which MS negatively affects C57BL/6N mice, especially the effects caused by MS in the early phase. Early life adversity especially can alter plasticity functions. To determine whether adverse early life experiences induce changes in plasticity in the brain hippocampus, we established an MS paradigm. In this research, the mice were treated with mild (15 min, MS15) or prolonged (180 min, MS180) maternal separation from postnatal day 2 to postnatal day 21. The mice underwent a forced swimming test, a tail suspension test, and an open field test, respectively. Afterward, the mice were sacrificed on postnatal day 31 to determine the effects of MS on early life stages. Results implied that MS induces depression-like behavior and the effects may be mediated partly by interfering with the hippocampal GSK-3β-CREB signaling pathway and by reducing the levels of some plasticity-related proteins.
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Aloni E, Shapira M, Eldar-Finkelman H, Barnea A. GSK-3β Inhibition Affects Singing Behavior and Neurogenesis in Adult Songbirds. BRAIN, BEHAVIOR AND EVOLUTION 2015; 85:233-44. [PMID: 26065821 DOI: 10.1159/000382029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 04/01/2015] [Indexed: 11/19/2022]
Abstract
GSK-3 (glycogen synthase kinase-3) is a serine/threonine kinase which is a critical regulator in neuronal signaling, cognition, and behavior. We have previously shown that unlike other vertebrates that harbor both α and β GSK-3 genes, the α gene is missing in birds. Therefore, birds can be used as a new animal model to study the roles of GSK-3β in behavior and in regulating adult neurogenesis. In the present study, we inhibited GSK-3β in brains of adult male zebra finches (Taeniopygia guttata) and accordingly investigated how this inhibition affects behavior and cell proliferation. Our results show that GSK-3 inhibition: (1) affects specific aspects of singing behavior, which might be related to social interactions in birds, and (2) differentially affects cell proliferation in various parts of the ventricular zone. Taken together, our study demonstrates a role of GSK-3β in regulating singing behavior and neuronal proliferation in birds and highlights the importance of GSK-3β in modulating cognitive abilities as well as social behavior.
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Affiliation(s)
- Etay Aloni
- Department of Human Molecular Genetics and Biochemistry, Tel Aviv University, Tel Aviv, Israel
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Balogh A, Németh M, Koloszár I, Markó L, Przybyl L, Jinno K, Szigeti C, Heffer M, Gebhardt M, Szeberényi J, Müller DN, Sétáló G, Pap M. Overexpression of CREB protein protects from tunicamycin-induced apoptosis in various rat cell types. Apoptosis 2015; 19:1080-98. [PMID: 24722832 DOI: 10.1007/s10495-014-0986-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Endoplasmic reticulum (ER) stress plays an essential role in unfolded protein response induced apoptosis contributing to several pathological conditions. Glycogen synthase kinase-3β (GSK-3β) plays a central role in several apoptotic signaling, including ER stress, as the active form of GSK-3β induces apoptosis. The phosphorylation of cAMP responsive element (CRE) binding protein (CREB) Ser-133 (S133) residue is the end-point of various signaling pathways, like growth factor signaling, while the Ser-129 (S129) residue is phosphorylated by GSK-3β. The significance of the ubiquitously expressed transcription factor CREB is demonstrated in prolonged, tunicamycin (TM)-induced ER stress in this study. In the experiments wild-type (wt) CREB, S129Ala, S133Ala or S129Ala-S133Ala mutant CREB expressing PC12 rat pheochromocytoma cell lines showed increased survival under TM-evoked prolonged ER stress compared to wtPC12 cells. After TM treatment ER stress was activated in all PC12 cell types. Lithium and SB-216763, the selective, well-known inhibitors of GSK-3β, decreased TM-induced apoptosis and promoted cell survival. The proapoptotic BH3-only Bcl-2 family member Bcl-2-interacting mediator of cell death (Bim) level was decreased in the different CREB overexpressing PC12 cells as a result of TM treatment. CREB overexpression also inhibited the sequestration of Bim protein from tubulin molecules, as it was demonstrated in wtPC12 cells. Transient expression of wtCREB diminished TM-induced apoptosis in wtPC12, Rat-1 and primary rat vascular smooth muscle cells. These findings demonstrate a novel role of CREB in different cell types as a potent protector against ER stress.
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Affiliation(s)
- András Balogh
- Department of Medical Biology, University of Pécs Medical School, Szigeti 12, Pecs, 7624, Hungary
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Wang Y, Hou Y, Zhao L, He Z, Jiang J, Li Z, Du Z, Yan T, Wang L. Multiple alternative splicing and differential expression patterns of the glycogen synthase kinase-3β (GSK3β) gene in Schizothorax prenanti. Comp Biochem Physiol B Biochem Mol Biol 2015; 181:1-6. [DOI: 10.1016/j.cbpb.2014.11.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2014] [Revised: 11/10/2014] [Accepted: 11/11/2014] [Indexed: 11/28/2022]
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Morris MC, Gilliam EA, Li L. Innate immune programing by endotoxin and its pathological consequences. Front Immunol 2015; 5:680. [PMID: 25610440 PMCID: PMC4285116 DOI: 10.3389/fimmu.2014.00680] [Citation(s) in RCA: 145] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 12/16/2014] [Indexed: 12/24/2022] Open
Abstract
Monocytes and macrophages play pivotal roles in inflammation and homeostasis. Recent studies suggest that dynamic programing of macrophages and monocytes may give rise to distinct "memory" states. Lipopolysaccharide (LPS), a classical pattern recognition molecule, dynamically programs innate immune responses. Emerging studies have revealed complex dynamics of cellular responses to LPS, with high doses causing acute, resolving inflammation, while lower doses are associated with low-grade and chronic non-resolving inflammation. These phenomena hint at dynamic complexities of intra-cellular signaling circuits downstream of the Toll-like receptor 4 (TLR4). In this review, we examine pathological effects of varying LPS doses with respect to the dynamics of innate immune responses and key molecular regulatory circuits responsible for these effects.
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Affiliation(s)
- Matthew C. Morris
- Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
| | - Elizabeth A. Gilliam
- Virginia Tech Carillion School of Medicine and Research Institute, Roanoke, VA, USA
| | - Liwu Li
- Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
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Morris MC, Gilliam EA, Button J, Li L. Dynamic modulation of innate immune response by varying dosages of lipopolysaccharide (LPS) in human monocytic cells. J Biol Chem 2014; 289:21584-90. [PMID: 24970893 DOI: 10.1074/jbc.m114.583518] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Innate monocytes and macrophages can be dynamically programmed into distinct states depending upon the strength of external stimuli. Innate programming may bear significant relevance to the pathogenesis and resolution of human inflammatory diseases. However, systems analyses with regard to the dynamic programming of innate leukocytes are lacking. In this study, we focused on the dynamic responses of human promonocytic THP-1 cells to lipopolysaccharide (LPS). We observed that varying dosages of LPS differentially modulate the expression of selected pro- and anti- inflammatory mediators such as IL-6 and IL-33. Super-low dosages of LPS preferentially induced the pro-inflammatory mediator IL-6, while higher dosages of LPS induced both IL-6 and IL-33. Mechanistically, we demonstrated that super-low and high doses of LPS cause differential activation of GSK3 and Akt, as well as the transcription factors FoxO1 and CREB. Inhibition of GSK3 enabled THP-1 cells to express IL-33 when challenged with super-low dose LPS. On the other hand, activation of CREB with adenosine suppressed IL-6 expression. Taken together, our study reveals a dynamic modulation of monocytic cells in response to varying dosages of endotoxin, and may shed light on our understanding of the dynamic balance that controls pathogenesis and resolution of inflammatory diseases.
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Affiliation(s)
- Matthew C Morris
- From the Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 and
| | | | - Julia Button
- From the Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 and
| | - Liwu Li
- From the Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 and the Virginia Tech Carillion School of Medicine, Roanoke, Virginia 24016
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Vandomme J, Touil Y, Ostyn P, Olejnik C, Flamenco P, El Machhour R, Segard P, Masselot B, Bailliez Y, Formstecher P, Polakowska R. Insulin-like growth factor 1 receptor and p38 mitogen-activated protein kinase signals inversely regulate signal transducer and activator of transcription 3 activity to control human dental pulp stem cell quiescence, propagation, and differentiation. Stem Cells Dev 2014; 23:839-51. [PMID: 24266654 DOI: 10.1089/scd.2013.0400] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Dental pulp stem cells (DPSCs) remain quiescent until activated in response to severe dental pulp damage. Once activated, they exit quiescence and enter regenerative odontogenesis, producing reparative dentin. The factors and signaling molecules that control the quiescence/activation and commitment to differentiation of human DPSCs are not known. In this study, we determined that the inhibition of insulin-like growth factor 1 receptor (IGF-1R) and p38 mitogen-activated protein kinase (p38 MAPK) signaling commonly activates DPSCs and promotes their exit from the G0 phase of the cell cycle as well as from the pyronin Y(low) stem cell compartment. The inhibition of these two pathways, however, inversely determines DPSC fate. In contrast to p38 MAPK inhibitors, IGF-1R inhibitors enhance dental pulp cell sphere-forming capacity and reduce the cells' colony-forming capacity without inducing cell death. The inverse cellular changes initiated by IGF-1R and p38 MAPK inhibitors were accompanied by inverse changes in the levels of active signal transducer and activator of transcription 3 (STAT3) factor, inactive glycogen synthase kinase 3, and matrix extracellular phosphoglycoprotein, a marker of early odontoblast differentiation. Our data suggest that there is cross talk between the IGF-1R and p38 MAPK signaling pathways in DPSCs and that the signals provided by these pathways converge at STAT3 and inversely regulate its activity to maintain quiescence or to promote self-renewal and differentiation of the cells. We propose a working model that explains the possible interactions between IGF-1R and p38 MAPK at the molecular level and describes the cellular consequences of these interactions. This model may inspire further fundamental study and stimulate research on the clinical applications of DPSC in cellular therapy and tissue regeneration.
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Affiliation(s)
- Jerome Vandomme
- 1 Inserm U837 Jean-Pierre Aubert Research Center, Institut pour la Recherche sur le Cancer de Lille (IRCL) , Lille, France
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Datusalia AK, Sharma SS. Amelioration of Diabetes-induced Cognitive Deficits by GSK-3β Inhibition is Attributed to Modulation of Neurotransmitters and Neuroinflammation. Mol Neurobiol 2014; 50:390-405. [DOI: 10.1007/s12035-014-8632-x] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Accepted: 01/02/2014] [Indexed: 12/21/2022]
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Ginseng Total Saponins Reverse Corticosterone-Induced Changes in Depression-Like Behavior and Hippocampal Plasticity-Related Proteins by Interfering with GSK-3 β -CREB Signaling Pathway. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 2014:506735. [PMID: 24523822 PMCID: PMC3913067 DOI: 10.1155/2014/506735] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Revised: 11/30/2013] [Accepted: 12/05/2013] [Indexed: 12/31/2022]
Abstract
This study aimed to explore the antidepressant mechanisms of ginseng total saponins (GTS) in the corticosterone-induced mouse depression model. In Experiment 1, GTS (50, 25, and 12.5 mg kg(-1) d(-1), intragastrically) were given for 3 weeks. In Experiment 2, the same doses of GTS were administrated after each corticosterone (20 mg kg(-1) d(-1), subcutaneously) injection for 22 days. In both experiments, mice underwent a forced swimming test and a tail suspension test on day 20 and day 21, respectively, and were sacrificed on day 22. Results of Experiment 1 revealed that GTS (50 and 25 mg kg(-1) d(-1)) exhibited antidepressant activity and not statistically altered hippocampal protein levels of brain-derived neurotrophic factor (BDNF) and neurofilament light chain (NF-L). Results of Experiment 2 showed that GTS (50 and 25 mg kg(-1) d(-1)) ameliorated depression-like behavior without normalizing hypercortisolism. The GTS treatments reversed the corticosterone-induced changes in mRNA levels of BDNF and NF-L, and protein levels of BDNF NF-L, phosphor-cAMP response element-binding protein (Ser133), and phosphor-glycogen synthase kinase-3 β (Ser9) in the hippocampus. These findings imply that the effect of GTS on corticosterone-induced depression-like behavior may be mediated partly through interfering with hippocampal GSK-3 β -CREB signaling pathway and reversing decrease of some plasticity-related proteins.
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Baarsma HA, Bos S, Meurs H, Visser KH, Smit M, Schols AMWJ, Langen RC, Kerstjens HAM, Gosens R. Pharmacological inhibition of GSK-3 in a guinea pig model of LPS-induced pulmonary inflammation: I. Effects on lung remodeling and pathology. Respir Res 2013; 14:113. [PMID: 24152196 PMCID: PMC4015129 DOI: 10.1186/1465-9921-14-113] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Accepted: 10/14/2013] [Indexed: 12/13/2022] Open
Abstract
Background Glycogen synthase kinase-3 (GSK-3) is a constitutively active kinase that regulates multiple signalling proteins and transcription factors involved in a myriad of cellular processes. The kinase acts as a negative regulator in β-catenin signalling and is critically involved in the smad pathway. Activation of both pathways may contribute to pulmonary features of chronic obstructive pulmonary disease (COPD). Methods In the present study, we investigated the effect of the selective GSK-3 inhibitor SB216763 on pulmonary pathology in a guinea pig model of lipopolysaccharide (LPS)-induced COPD. Guinea pigs were instilled intranasally with LPS or saline twice weekly for 12 weeks and pre-treated with either intranasally instilled SB216763 or corresponding vehicle 30 min prior to each LPS/saline challenge. Results Repeated LPS exposures activated β-catenin signalling, primarily in the airway epithelium and submucosa. LPS also induced pulmonary inflammation and tissue remodelling as indicated by inflammatory cell influx, increased pulmonary fibronectin expression and enhanced small airway collagen content. Inhibition of GSK-3 by SB216763 did not affect LPS-induced inflammatory cell influx, but prevented the small airway remodelling and, unexpectedly, inhibited the activation of β-catenin in vivo. LPS or SB216763 treatment had no effect on the airway smooth muscle content and alveolar airspace size. However, GSK-3 inhibition prevented LPS-induced right ventricle hypertrophy. Conclusions Our findings indicate that GSK-3 inhibition prevents LPS-induced pulmonary pathology in guinea pigs, and that locally reduced LPS-induced β-catenin activation appears in part to underlie this effect.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Reinoud Gosens
- Department of Molecular Pharmacology, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands.
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Low-level laser therapy rescues dendrite atrophy via upregulating BDNF expression: implications for Alzheimer's disease. J Neurosci 2013; 33:13505-17. [PMID: 23946409 DOI: 10.1523/jneurosci.0918-13.2013] [Citation(s) in RCA: 142] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Downregulation of brain-derived neurotrophic factor (BDNF) in the hippocampus occurs early in the progression of Alzheimer's disease (AD). Since BDNF plays a critical role in neuronal survival and dendrite growth, BDNF upregulation may contribute to rescue dendrite atrophy and cell loss in AD. Low-level laser therapy (LLLT) has been demonstrated to regulate neuronal function both in vitro and in vivo. In the present study, we found that LLLT rescued neurons loss and dendritic atrophy via upregulation of BDNF in both Aβ-treated hippocampal neurons and cultured APP/PS1 mouse hippocampal neurons. Photoactivation of transcription factor CRE-binding protein (CREB) increased both BDNF mRNA and protein expression, since knockdown CREB blocked the effects of LLLT. Furthermore, CREB-regulated transcription was in an ERK-dependent manner. Inhibition of ERK attenuated the DNA-binding efficiency of CREB to BDNF promoter. In addition, dendrite growth was improved after LLLT, characterized by upregulation of Rac1 activity and PSD-95 expression, and the increase in length, branching, and spine density of dendrites in hippocampal neurons. Together, these studies suggest that upregulation of BDNF with LLLT by activation of ERK/CREB pathway can ameliorate Aβ-induced neurons loss and dendritic atrophy, thus identifying a novel pathway by which LLLT protects against Aβ-induced neurotoxicity. Our research may provide a feasible therapeutic approach to control the progression of AD.
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Fischer M, Quaas M, Wintsche A, Müller GA, Engeland K. Polo-like kinase 4 transcription is activated via CRE and NRF1 elements, repressed by DREAM through CDE/CHR sites and deregulated by HPV E7 protein. Nucleic Acids Res 2013; 42:163-80. [PMID: 24071582 PMCID: PMC3874167 DOI: 10.1093/nar/gkt849] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Infection by oncogenic viruses is a frequent cause for tumor formation as observed in cervical cancer. Viral oncoproteins cause inactivation of p53 function and false transcriptional regulation of central cell cycle genes. Here we analyze the regulation of Plk4, serving as an example of many cell cycle- and p53-regulated genes. Cell cycle genes are often repressed via CDE and CHR elements in their promoters and activated by NF-Y binding to CCAAT-boxes. In contrast, general activation of Plk4 depends on NRF1 and CRE sites. Bioinformatic analyses imply that NRF1 and CRE are central elements of the transcriptional network controlling cell cycle genes. We identify CDE and CHR sites in the Plk4 promoter, which are necessary for binding of the DREAM (DP, RB-like, E2F4 and MuvB) complex and for mediating repression in G0/G1. When cells progress to G2 and mitosis, DREAM is replaced by the MMB (Myb-MuvB) complex that only requires the CHR element for binding. Plk4 expression is downregulated by the p53-p21WAF1/CIP1-DREAM signaling pathway through the CDE and CHR sites. Cell cycle- and p53-dependent repression is abrogated by HPV E7 oncoprotein. Together with genome-wide analyses our results imply that many cell cycle genes upregulated in tumors by viral infection are bound by DREAM through CDE/CHR sites.
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Affiliation(s)
- Martin Fischer
- Molecular Oncology, Medical School, University of Leipzig, Semmelweisstr. 14, 04103 Leipzig, Germany and Computational EvoDevo Group, Department of Computer Science and Interdisciplinary Center for Bioinformatics, University of Leipzig, Härtelstr. 16-18, 04107 Leipzig, Germany
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Baarsma HA, Engelbertink LHJM, van Hees LJ, Menzen MH, Meurs H, Timens W, Postma DS, Kerstjens HAM, Gosens R. Glycogen synthase kinase-3 (GSK-3) regulates TGF-β₁-induced differentiation of pulmonary fibroblasts. Br J Pharmacol 2013; 169:590-603. [PMID: 23297769 PMCID: PMC3682707 DOI: 10.1111/bph.12098] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Accepted: 12/12/2012] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Chronic lung diseases such as asthma, COPD and pulmonary fibrosis are characterized by abnormal extracellular matrix (ECM) turnover. TGF-β is a key mediator stimulating ECM production by recruiting and activating lung fibroblasts and initiating their differentiation process into more active myofibroblasts. Glycogen synthase kinase-3 (GSK-3) regulates various intracellular signalling pathways; its role in TGF-β₁-induced myofibroblast differentiation is currently largely unknown. PURPOSE To determine the contribution of GSK-3 signalling in TGF-β₁-induced myofibroblast differentiation. EXPERIMENTAL APPROACH We used MRC5 human lung fibroblasts and primary pulmonary fibroblasts of individuals with and without COPD. Protein and mRNA expression were determined by immunoblotting and RT-PCR analysis respectively. RESULTS Stimulation of MRC5 and primary human lung fibroblasts with TGF-β₁ resulted in time- and dose-dependent increases of α-sm-actin and fibronectin expression, indicative of myofibroblast differentiation. Pharmacological inhibition of GSK-3 by SB216763 dose-dependently attenuated TGF-β₁-induced expression of these myofibroblasts markers. Moreover, silencing of GSK-3 by siRNA or pharmacological inhibition by CT/CHIR99021 fully inhibited the TGF-β₁-induced expression of α-sm-actin and fibronectin. The effect of GSK-3 inhibition on α-sm-actin expression was similar in fibroblasts from individuals with and without COPD. Neither smad, NF-κB nor ERK1/2 were involved in the inhibitory actions of GSK-3 inhibition by SB126763 on myofibroblast differentiation. Rather, SB216763 increased the phosphorylation of CREB, which in its phosphorylated form acts as a functional antagonist of TGF-β/smad signalling. CONCLUSION AND IMPLICATION We demonstrate that GSK-3 signalling regulates TGF-β₁-induced myofibroblast differentiation by regulating CREB phosphorylation. GSK-3 may constitute a useful target for treatment of chronic lung diseases.
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Affiliation(s)
- Hoeke A Baarsma
- Department of Molecular Pharmacology, GRIAC Research Institute, University of Groningen, Groningen, The Netherlands.
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Banan M, Esmaeilzadeh-Gharehdaghi E, Nezami M, Deilami Z, Farashi S, Philipsen S, Esteghamat F, Pourfarzad F, Ali Imam AM, Najmabadi H. cAMP response element-binding protein 1 is required for hydroxyurea-mediated induction of γ-globin expression in K562 cells. Clin Exp Pharmacol Physiol 2013; 39:510-7. [PMID: 22469229 DOI: 10.1111/j.1440-1681.2012.05702.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
1. Hydroxyurea (HU) is a drug used for the treatment of haemoglobinopathies. Hydroxyurea functions by upregulating γ-globin transcription and fetal haemoglobin (HbF) production in erythroid cells. The K562 erythroleukaemia cell line is widely used as a model system in which to study the mechanism of γ-globin induction by HU. However, the transcription factors required for the upregulation of γ-globin expression by HU in K562 cells have not been identified. Similarities between the HU and sodium butyrate (SB) pathways suggest cAMP response element-binding protein (CREB) 1 as a potential candidate. Thus, the aim of the present study was to investigate the possible role of CREB1 in the HU pathway. 2. Experiments were performed using transient and stable RNA interference (RNAi) to show that CREB1 is necessary for HU-mediated induction of γ-globin expression and haemoglobin production in K562 cells. 3. Furthermore, western blot analyses demonstrated that CREB1 becomes phosphorylated in a dose-dependent manner after HU (100-400 µmol/L) treatment of K562 cells for 72 h. 4. We also investigated role of a Gγ promoter CREB1 response element (G-CRE) in this pathway. Quantitative amplification refractory mutation system-polymerase chain reaction experiments were performed to demonstrate that HU induces the expression of both Gγ and Aγ in this cell line. In addition, electrophoretic mobility shift assays were used to show that levels of CREB1 complexes binding to the G-CRE site are increased following HU treatment and are decreased in CREB1-knockdown cells. 5. The results suggest that CREB1 is necessary for γ-globin induction by HU in K562 cells, a role that may be mediated, in part, through the G-CRE element.
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Affiliation(s)
- Mehdi Banan
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
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S632A3, a new glutarimide antibiotic, suppresses lipopolysaccharide-induced pro-inflammatory responses via inhibiting the activation of glycogen synthase kinase 3β. Exp Cell Res 2012; 318:2592-603. [PMID: 22975730 DOI: 10.1016/j.yexcr.2012.08.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Revised: 08/28/2012] [Accepted: 08/31/2012] [Indexed: 12/23/2022]
Abstract
Inflammatory mediators including inducible nitric oxide (iNOS), cyclooxygenase-2 (COX-2), tumor necrosis factor-α (TNF-α) and Interleukin-6 (IL-6) contribute to the course of a variety of inflammatory diseases. S632A3 is a new member of the glutarimide antibiotics isolated from a cultured broth of Streptomyces hygroscopicus S632 with a potent NF-κB inhibitory activity. In the present study, we investigated the anti-inflammatory effects and the underlying molecular mechanism of S632A3 on lipopolysaccharide (LPS)-stimulated RAW264.7 macrophages. S632A3 concentration-dependently inhibited LPS-induced NO and prostaglandin E(2) (PGE(2)) production through the suppression of iNOS and COX-2 at gene transcription levels. In addition, S632A3 suppressed NF-κB-dependent inflammatory responses by inhibiting the activation of glycogen synthase kinase 3β (GSK-3β), while the activation of IκB kinase (IKK) complex was unaffected. S632A3 suppressed NF-κB activity by differentially affecting the CREB (cAMP response element-binding protein) and NF-κB p65 interacting with the coactivator CBP (CREB binding protein). S632A3 also inhibited GSK-3β-elicited iNOS and COX-2 expression. Moreover, S632A3 was shown to inhibit the activation of ASK1 (Apoptosis-signal regulating kinase 1) and p38 mitogen-activated protein kinase, therefore attenuated the LPS-induced NF-κB activity in macrophages. Furthermore, S632A3 significantly reduced the pro-inflammatory cytokines TNF-α and IL-6 production while increased the anti-inflammatory cytokine IL-10 production in LPS-stimulated RAW264.7 cells. Our study thus provides a molecular mechanism by which S632A3 inhibited LPS-induced pro-inflammatory response in macrophages through interfering with the activation of GSK-3β and ASK1-p38 signaling.
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Naderi A, Meyer M. Prolactin-induced protein mediates cell invasion and regulates integrin signaling in estrogen receptor-negative breast cancer. Breast Cancer Res 2012; 14:R111. [PMID: 22817771 PMCID: PMC3680918 DOI: 10.1186/bcr3232] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Accepted: 07/20/2012] [Indexed: 12/11/2022] Open
Abstract
Introduction Molecular apocrine is a subtype of estrogen receptor (ER)-negative breast cancer that is characterized by a steroid-response gene signature. We have recently identified a positive feedback loop between androgen receptor (AR) and extracellular signal-regulated kinase (ERK) signaling in this subtype. In this study, we investigated the transcriptional regulation of molecular apocrine genes by the AR-ERK feedback loop. Methods The transcriptional effects of AR and ERK inhibition on molecular apocrine genes were assessed in cell lines. The most regulated gene in this process, prolactin-induced protein (PIP), was further studied using immunohistochemistry of breast tumors and xenograft models. The transcriptional regulation of PIP was assessed by luciferase reporter assay and chromatin immunoprecipitation. The functional significance of PIP in cell invasion and viability was assessed using siRNA knockdown experiments and the mechanism of PIP effect on integrin-β1 signaling was studied using immunoblotting and immunoprecipitation. Results We found that PIP is the most regulated molecular apocrine gene by the AR-ERK feedback loop and is overexpressed in ER-/AR+ breast tumors. In addition, PIP expression is regulated by AR-ERK signaling in xenograft models. These observations are explained by the fact that PIP is a target gene of the ERK-CREB1 pathway and is also induced by AR activation. Furthermore, we demonstrated that PIP has a significant functional role in maintaining cell invasion and viability of molecular apocrine cells because of a positive regulatory effect on the Integrin-ERK and Integrin-Akt signaling pathways. In fact, PIP-knockdown markedly decreases the phosphorylation of ERK, Akt, and CREB1. Importantly, PIP knockdown leads to a marked reduction of integrin-β1 binding to ILK1 and ErbB2 that can be reversed by the addition of fibronectin fragments. Conclusions We have identified a novel feedback loop between PIP and CREB1 mediated through the Integrin signaling pathway. In this process, PIP cleaves fibronectin to release fragments that activate integrin signaling, which in turn increases PIP expression through the ERK-CREB1 pathway. In addition, we demonstrated that PIP expression has a profound effect on cell invasion and the viability of molecular apocrine cells. Therefore, PIP signaling may be a potential therapeutic target in molecular apocrine breast cancer.
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Wang L, Zuo B, Xu D, Ren Z, Zhang H, Li X, Lei M, Xiong Y. Alternative splicing of the porcine glycogen synthase kinase 3β (GSK-3β) gene with differential expression patterns and regulatory functions. PLoS One 2012; 7:e40250. [PMID: 22792253 PMCID: PMC3391277 DOI: 10.1371/journal.pone.0040250] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2011] [Accepted: 06/04/2012] [Indexed: 01/07/2023] Open
Abstract
Background Glycogen synthase kinase 3 (GSK3α and GSK3β) are serine/threonine kinases involved in numerous cellular processes and diverse diseases including mood disorders, Alzheimer’s disease, diabetes, and cancer. However, in pigs, the information on GSK3 is very limited. Identification and characterization of pig GSK3 are not only important for pig genetic improvement, but also contribute to the understanding and development of porcine models for human disease prevention and treatment. Methodology Five different isoforms of GSK3β were identified in porcine different tissues, in which three isoforms are novel. These isoforms had differential expression patterns in the fetal and adult of the porcine different tissues. The mRNA expression level of GSK3β isoforms was differentially regulated during the course of the insulin treatment, suggesting that different GSK3β isoforms may have different roles in insulin signaling pathway. Moreover, GSK3β5 had a different role on regulating the glycogen synthase activity, phosphorylation and the expression of porcine GYS1 and GYS2 gene compared to other GSK3β isoforms. Conclusions We are the first to report five different isoforms of GSK3β identified from the porcine different tissues. Splice variants of GSK3β exhibit differential activity towards glycogen synthase. These results provide new insight into roles of the GSK3β on regulating glycogen metabolism.
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Affiliation(s)
- Linjie Wang
- Institute of Animal Genetics and Breeding, Sichuan Agricultural University, Ya’an, Sichuan, People’s Republic of China
- * E-mail: (LW); (YX)
| | - Bo Zuo
- Key Laboratory of Swine Genetics and Breeding, Ministry of Agriculture & Key Laboratory of Agriculture Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, People’s Republic of China
| | - Dequan Xu
- Key Laboratory of Swine Genetics and Breeding, Ministry of Agriculture & Key Laboratory of Agriculture Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, People’s Republic of China
| | - Zuqing Ren
- Key Laboratory of Swine Genetics and Breeding, Ministry of Agriculture & Key Laboratory of Agriculture Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, People’s Republic of China
| | - Hongping Zhang
- Institute of Animal Genetics and Breeding, Sichuan Agricultural University, Ya’an, Sichuan, People’s Republic of China
| | - Xuewei Li
- Institute of Animal Genetics and Breeding, Sichuan Agricultural University, Ya’an, Sichuan, People’s Republic of China
| | - Minggang Lei
- Key Laboratory of Swine Genetics and Breeding, Ministry of Agriculture & Key Laboratory of Agriculture Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, People’s Republic of China
| | - Yuanzhu Xiong
- Key Laboratory of Swine Genetics and Breeding, Ministry of Agriculture & Key Laboratory of Agriculture Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, People’s Republic of China
- * E-mail: (LW); (YX)
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Mullenbrock S, Shah J, Cooper GM. Global expression analysis identified a preferentially nerve growth factor-induced transcriptional program regulated by sustained mitogen-activated protein kinase/extracellular signal-regulated kinase (ERK) and AP-1 protein activation during PC12 cell differentiation. J Biol Chem 2011; 286:45131-45. [PMID: 22065583 DOI: 10.1074/jbc.m111.274076] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Neuronal differentiation of PC12 cells in response to NGF is a prototypical model in which signal duration determines a biological response. Sustained ERK activity induced by NGF, as compared with transient activity induced by EGF, is critical to the differentiation of these cells. To characterize the transcriptional program activated preferentially by NGF, we compared global gene expression profiles between cells treated with NGF and EGF for 2-4 h, when sustained ERK signaling in response to NGF is most distinct from the transient signal elicited by EGF. This analysis identified 69 genes that were preferentially up-regulated in response to NGF. As expected, up-regulation of these genes was mediated by sustained ERK signaling. In addition, they were up-regulated in response to other neuritogenic treatments (pituitary adenylate cyclase-activating polypeptide and 12-O-tetradecanoylphorbol-13-acetate plus dbcAMP) and were enriched for genes related to neuronal differentiation/function. Computational analysis and chromatin immunoprecipitation identified binding of CREB and AP-1 family members (Fos, FosB, Fra1, JunB, JunD) upstream of >30 and 50%, respectively, of the preferentially NGF-induced genes. Expression of several AP-1 family members was induced by both EGF and NGF, but their induction was more robust and sustained in response to NGF. The binding of Fos family members to their target genes was similarly sustained in response to NGF and was reduced upon MEK inhibition, suggesting that AP-1 contributes significantly to the NGF transcriptional program. Interestingly, Fra1 as well as two other NGF-induced AP-1 targets (HB-EGF and miR-21) function in positive feedback loops that may contribute to sustained AP-1 activity.
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Affiliation(s)
- Steven Mullenbrock
- Department of Biology, Boston University, Boston, Massachusetts 02215, USA
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Cyclic AMP response element-binding protein prevents endothelial permeability increase through transcriptional controlling p190RhoGAP expression. Blood 2011; 119:308-19. [PMID: 22049513 DOI: 10.1182/blood-2011-02-339473] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Increased endothelial permeability contributes to the morbidity and mortality associated with chronic inflammatory diseases, including acute lung injury. Cyclic AMP response element-binding protein (CREB) transcriptional factor induces genes that regulate inflammation and vascular remodeling. However, the role of CREB in regulating endothelial barrier function is unknown. Here, we demonstrate that CREB maintains basal endothelial barrier function and suppresses endothelial permeability increase by diverse agonists such as thrombin, lipopolysaccharide, histamine, and VEGF. We show that CREB transcriptionally controls the expression of p190RhoGAP-A, a GTPase-activating protein that inhibits small GTPase RhoA. Impairing CREB function using small interfering RNA or dominant-negative (dn)-CREB mutant (dn-CREB) markedly suppressed p190RhoGAP-A expression, increased RhoA activity, induced actin stress fiber formation, and produced an amplified and protracted increase in endothelial permeability in response to thrombin. Rescuing p190RhoGAP-A expression restored the permeability defect in dn-CREB-transducing endothelial cells. These findings were recapitulated in vivo because dn-CREB expression in mice vasculature increased basal lung microvessel permeability and exaggerated permeability increase induced by thrombin and lipopolysaccharide. Inhibiting RhoA signaling restored endothelial barrier dysfunction in the dn-CREB-expressing lung microvasculature. These results uncover a pivotal role of CREB in regulating endothelial barrier function by restricting RhoA signaling through controlling p190RhoGAP-A expression.
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Yuan HD, Kim DY, Quan HY, Kim SJ, Jung MS, Chung SH. Ginsenoside Rg2 induces orphan nuclear receptor SHP gene expression and inactivates GSK3β via AMP-activated protein kinase to inhibit hepatic glucose production in HepG2 cells. Chem Biol Interact 2011; 195:35-42. [PMID: 22062806 DOI: 10.1016/j.cbi.2011.10.006] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Revised: 10/19/2011] [Accepted: 10/23/2011] [Indexed: 12/28/2022]
Abstract
Panax ginseng is known to have anti-diabetic activity, but the active ingredients have not been fully explored yet. Here, we test whether ginsenoside Rg2 has an inhibitory effect on hepatic glucose production and determine its mechanism of action. Rg2 significantly inhibits hepatic glucose production and induces phosphorylations of liver kinase B1 (LKB1), AMP-activated protein kinase (AMPK) and glycogen synthase kinase 3β (GSK3β) in time- and concentration-dependent manners in human HepG2 hepatoma cells, and these effects were abolished in the presence of compound C, a selective AMPK inhibitor. In addition, phosphorylated form of cAMP-response element-binding protein (CREB), a key transcription factor for hepatic gluconeogenesis, was decreased in time- and concentration-dependent manners. Next, gene expression of orphan nuclear receptor small heterodimer partner (SHP) was also examined. Rg2 markedly enhanced the gene expression of SHP and its direct interaction with CREB, which results in disruption of CREB·CRTC2 complex. Consequently, expressions of relevant genes such as peroxisome proliferation-activated receptor γ coactivator-1α (PGC-1α), phosphoenolpyruvate carboxykinase (PEPCK) and glucose-6-phosphatase (G6Pase) were all significantly suppressed and these effects were also reversed in the presence of compound C. In conclusion, our results propose that ginsenoside Rg2 suppresses the hepatic glucose production via AMPK-induced phosphorylation of GSK3β and induction of SHP gene expression. Further studies are warranted to elucidate a therapeutic potential of Rg2 for type 2 diabetic patients.
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Affiliation(s)
- Hai-Dan Yuan
- Department of Pharmacology and Clinical Pharmacy, College of Pharmacy, Kyung Hee University, Seoul, Republic of Korea
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Tullai JW, Graham JR, Cooper GM. A GSK-3-mediated transcriptional network maintains repression of immediate early genes in quiescent cells. Cell Cycle 2011; 10:3072-7. [PMID: 21900749 DOI: 10.4161/cc.10.18.17321] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Glycogen synthase kinase-3 (GSK-3) plays a central role in cell survival and proliferation, in part by the regulation of transcription. Unlike most protein kinases, GSK-3 is active in quiescent cells in the absence of growth factor signaling. In a recent series of studies, we employed a systems-level approach to understanding the transcription network regulated by GSK-3 in a quiescent cell model. We identified a group of immediate early genes that were upregulated in quiescent cells solely by the inhibition of GSK-3 in the absence of growth factor stimulation. Computational analysis of the upstream sequences of these genes identified statistically over-represented binding sites for the transcription factors CREB, NFκB and AP-1, and the roles of these factors in regulating expression of GSK-3 target genes were verified by chromatin immunoprecipitation and RNA interference. In quiescent cells, GSK-3 inhibits CREB, NFκB and AP-1, thereby maintaining repression of their target genes and contributing to maintenance of cell cycle arrest.
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Tullai JW, Tacheva S, Owens LJ, Graham JR, Cooper GM. AP-1 is a component of the transcriptional network regulated by GSK-3 in quiescent cells. PLoS One 2011; 6:e20150. [PMID: 21647439 PMCID: PMC3102068 DOI: 10.1371/journal.pone.0020150] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2011] [Accepted: 04/19/2011] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND The protein kinase GSK-3 is constitutively active in quiescent cells in the absence of growth factor signaling. Previously, we identified a set of genes that required GSK-3 to maintain their repression during quiescence. Computational analysis of the upstream sequences of these genes predicted transcription factor binding sites for CREB, NFκB and AP-1. In our previous work, contributions of CREB and NFκB were examined. In the current study, the AP-1 component of the signaling network in quiescent cells was explored. METHODOLOGY/PRINCIPAL FINDINGS Using chromatin immunoprecipitation analysis, two AP-1 family members, c-Jun and JunD, bound to predicted upstream regulatory sequences in 8 of the 12 GSK-3-regulated genes. c-Jun was phosphorylated on threonine 239 by GSK-3 in quiescent cells, consistent with previous studies demonstrating inhibition of c-Jun by GSK-3. Inhibition of GSK-3 attenuated this phosphorylation, resulting in the stabilization of c-Jun. The association of c-Jun with its target sequences was increased by growth factor stimulation as well as by direct GSK-3 inhibition. The physiological role for c-Jun was also confirmed by siRNA inhibition of gene induction. CONCLUSIONS/SIGNIFICANCE These results indicate that inhibition of c-Jun by GSK-3 contributes to the repression of growth factor-inducible genes in quiescent cells. Together, AP-1, CREB and NFκB form an integrated transcriptional network that is largely responsible for maintaining repression of target genes downstream of GSK-3 signaling.
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Affiliation(s)
- John W. Tullai
- Department of Biology, Boston University, Boston, Massachusetts, United States of America
| | - Silvia Tacheva
- Department of Biology, Boston University, Boston, Massachusetts, United States of America
| | - Laura J. Owens
- Department of Biology, Boston University, Boston, Massachusetts, United States of America
| | - Julie R. Graham
- Program in Molecular Biology, Cell Biology and Biochemistry, Boston University, Boston, Massachusetts, United States of America
| | - Geoffrey M. Cooper
- Department of Biology, Boston University, Boston, Massachusetts, United States of America
- * E-mail:
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Mines MA, Beurel E, Jope RS. Regulation of cell survival mechanisms in Alzheimer's disease by glycogen synthase kinase-3. Int J Alzheimers Dis 2011; 2011:861072. [PMID: 21629713 PMCID: PMC3100684 DOI: 10.4061/2011/861072] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2011] [Accepted: 03/09/2011] [Indexed: 11/27/2022] Open
Abstract
A pivotal role has emerged for glycogen synthase kinase-3 (GSK3) as an important contributor to Alzheimer's disease pathology. Evidence for the involvement of GSK3 in Alzheimer's disease pathology and neuronal loss comes from studies of GSK3 overexpression, GSK3 localization studies, multiple relationships between GSK3 and amyloid β-peptide (Aβ), interactions between GSK3 and the microtubule-associated tau protein, and GSK3-mediated apoptotic cell death. Apoptotic signaling proceeds by either an intrinsic pathway or an extrinsic pathway. GSK3 is well established to promote intrinsic apoptotic signaling induced by many insults, several of which may contribute to neuronal loss in Alzheimer's disease. Particularly important is evidence that GSK3 promotes intrinsic apoptotic signaling induced by Aβ. GSK3 appears to promote intrinsic apoptotic signaling by modulating proteins in the apoptosis signaling pathway and by modulating transcription factors that regulate the expression of proteins involved in apoptosis. Thus, GSK3 appears to contribute to several neuropathological mechanisms in Alzheimer's disease, including apoptosis-mediated neuronal loss.
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Affiliation(s)
- Marjelo A Mines
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Sparks Center 1057, 1720 Seventh Avenue South, Birmingham, AL 35294-0017, USA
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Naito S, Bilim V, Yuuki K, Ugolkov A, Motoyama T, Nagaoka A, Kato T, Tomita Y. Glycogen synthase kinase-3beta: a prognostic marker and a potential therapeutic target in human bladder cancer. Clin Cancer Res 2010; 16:5124-32. [PMID: 20889919 DOI: 10.1158/1078-0432.ccr-10-0275] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
PURPOSE Although recent studies have shown glycogen synthase kinase-3β (GSK-3β), a serine/threonine kinase, as a positive regulator of pancreatic, colon, and kidney cancer cell survival and proliferation, the role of GSK-3 in bladder cancer remains unknown. Our objectives were to determine the subcellular localization of GSK-3β and to evaluate the effect of GSK-3 inhibition in bladder cancer. EXPERIMENTAL DESIGN We used immunohistochemical staining and nuclear/cytosolic fractionation to determine the expression pattern of GSK-3β in human urothelial carcinomas. To study the effect of GSK-3 inhibition on bladder cancer cell proliferation and survival, we used pharmacologic inhibitors of GSK-3, RNA interference, MTS assay, bromodeoxyuridine incorporation assay, quantitative reverse transcriptase-PCR, and Western blotting. RESULTS We found aberrant nuclear accumulation of GSK-3β in 62% (43 of 69) and 91% (21 of 23) of noninvasive and invasive human urothelial carcinomas, respectively. GSK-3β nuclear staining was significantly associated with high-grade tumors (P < 0.001), advanced stage of bladder cancer (P < 0.05), metastasis (P < 0.05), and worse cause-specific survival (P < 0.05) in bladder cancer patients. Moreover, we found that pharmacologic inhibition or genetic depletion of GSK-3β resulted in decreased viability of bladder cancer cells. CONCLUSIONS Our results suggest nuclear accumulation of GSK-3β as a novel prognostic marker in bladder cancer, show that GSK-3 contributes to urothelial cancer cell proliferation and survival, and identify GSK-3 as a potential therapeutic target in human bladder cancer.
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Affiliation(s)
- Sei Naito
- Laboratory of Molecular Oncology, Department of Urology, Yamagata University School of Medicine, Yamagata, Japan
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mRNA degradation plays a significant role in the program of gene expression regulated by phosphatidylinositol 3-kinase signaling. Mol Cell Biol 2010; 30:5295-305. [PMID: 20855526 DOI: 10.1128/mcb.00303-10] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Control of gene expression by the phosphatidylinositol (PI) 3-kinase/Akt pathway plays an important role in mammalian cell proliferation and survival, and numerous transcription factors and genes regulated by PI 3-kinase signaling have been identified. Because steady-state levels of mRNA are regulated by degradation as well as transcription, we have investigated the importance of mRNA degradation in controlling gene expression downstream of PI 3-kinase. We previously performed global expression analyses that identified a set of approximately 50 genes that were downregulated following inhibition of PI 3-kinase in proliferating T98G cells. By blocking transcription with actinomycin D, we found that almost 40% of these genes were regulated via effects of PI 3-kinase on mRNA stability. Analyses of β-globin-3' untranslated region (UTR) fusion transcripts indicated that sequences within 3' UTRs were the primary determinants of rapid mRNA decay. Small interfering RNA (siRNA) experiments further showed that knockdown of BRF1 or KSRP, both ARE binding proteins (ARE-BPs) regulated by Akt, stabilized the mRNAs of a majority of the downregulated genes but that knockdown of ARE-BPs that are not regulated by PI 3-kinase did not affect degradation of these mRNAs. These results show that PI 3-kinase regulation of mRNA stability, predominantly mediated by BRF1, plays a major role in regulating gene expression.
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Olson ER, Melton T, Dickinson SE, Dong Z, Alberts DS, Bowden GT. Quercetin potentiates UVB-Induced c-Fos expression: implications for its use as a chemopreventive agent. Cancer Prev Res (Phila) 2010; 3:876-84. [PMID: 20551291 PMCID: PMC2925138 DOI: 10.1158/1940-6207.capr-09-0220] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Quercetin (Qu) is currently being investigated as a chemopreventive agent for several cancers, including nonmelanoma skin cancer induced by UV light. We previously reported that Qu degradation has important consequences on signaling and cell biology. In the current study, we report that Qu induces c-Fos mRNA and protein expression through activation of p38 and cAMP-responsive element binding protein (CREB), and Qu potentiates UVB-induced c-Fos expression. Inclusion of ascorbic acid (AA) in cell culture medium stabilizes Qu and completely prevents both Qu- and UVB-induced p38 and CREB activation, leading to a blockade of c-fos gene expression through reduced CREB/cAMP-responsive element binding. AA stabilizes c-Fos mRNA, increasing steady-state levels even when c-fos gene expression is suppressed, but this has no effect on c-Fos protein levels in either mock- or UVB-irradiated cells. We report that Qu blocks mammalian target of rapamycin signaling and inhibits c-Fos protein expression directly through this mechanism because cotreatment with Qu and AA resulted in the complete suppression of UVB-induced c-Fos protein expression even in the presence of significantly increased mRNA levels. We further confirmed that this was not due to increased protein turnover because inhibition of proteasome activity with MG-132 did not raise c-Fos protein levels in Qu+AA-treated cells. Together, these data indicate that although Qu has been reported to have some beneficial properties as a chemopreventive agent, it is also capable of inducing c-fos expression, a cellular event important for the promotion phase of tumor development, if it is not stabilized.
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Affiliation(s)
- Erik R Olson
- Arizona Cancer Center, University of Arizona, Tucson, USA.
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