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Acuña-Catalán D, Shah S, Wehrfritz C, Nomura M, Acevedo A, Olmos C, Quiroz G, Huerta H, Bons J, Ampuero E, Wyneken U, Sanhueza M, Arancibia F, Contreras D, Cárdenas JC, Morales B, Schilling B, Newman JC, González-Billault C. Ketogenic diet administration later in life improves memory by modifying the synaptic cortical proteome via the PKA signaling pathway in aging mice. Cell Rep Med 2024; 5:101593. [PMID: 38843842 PMCID: PMC11228662 DOI: 10.1016/j.xcrm.2024.101593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 02/26/2024] [Accepted: 05/14/2024] [Indexed: 06/21/2024]
Abstract
Aging compromises brain function leading to cognitive decline. A cyclic ketogenic diet (KD) improves memory in aged mice after long-term administration; however, short-term effects later in life and the molecular mechanisms that govern such changes remain unclear. Here, we explore the impact of a short-term KD treatment starting at elderly stage on brain function of aged mice. Behavioral testing and long-term potentiation (LTP) recordings reveal that KD improves working memory and hippocampal LTP. Furthermore, the synaptosome proteome of aged mice fed a KD long-term evidence changes predominantly at the presynaptic compartment associated to the protein kinase A (PKA) signaling pathway. These findings were corroborated in vivo by western blot analysis, with high BDNF abundance and PKA substrate phosphorylation. Overall, we show that a KD modifies brain function even when it is administered later in life and recapitulates molecular features of long-term administration, including the PKA signaling pathway, thus promoting synaptic plasticity at advanced age.
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Affiliation(s)
- Diego Acuña-Catalán
- Center for Geroscience, Brain Health, and Metabolism (GERO), Santiago, Chile; Department of Biology, Faculty of Sciences, Universidad de Chile, Santiago, Chile
| | - Samah Shah
- The Buck Institute for Research on Aging, Novato, CA, USA
| | | | | | - Alejandro Acevedo
- Institute of Nutrition and Food Technology (INTA), Universidad de Chile, Santiago, Chile
| | - Cristina Olmos
- Center for Geroscience, Brain Health, and Metabolism (GERO), Santiago, Chile; Department of Biology, Faculty of Sciences, Universidad de Chile, Santiago, Chile
| | - Gabriel Quiroz
- Center for Geroscience, Brain Health, and Metabolism (GERO), Santiago, Chile; Department of Biology, Faculty of Sciences, Universidad de Chile, Santiago, Chile
| | - Hernán Huerta
- Center for Geroscience, Brain Health, and Metabolism (GERO), Santiago, Chile; Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago, Chile
| | - Joanna Bons
- The Buck Institute for Research on Aging, Novato, CA, USA
| | - Estibaliz Ampuero
- Neurobiology of Behavior Laboratory, Department of Biology, Universidad de Santiago de Chile, Santiago, Chile
| | - Ursula Wyneken
- IMPACT, Center for Interventional Medicine for Precision and Advanced Cellular Therapy, and Faculty of Medicine, Universidad de Los Andes, Santiago, Chile
| | - Magdalena Sanhueza
- Department of Biology, Faculty of Sciences, Universidad de Chile, Santiago, Chile
| | - Felipe Arancibia
- Department of Biology, Faculty of Sciences, Universidad de Chile, Santiago, Chile
| | - Darwin Contreras
- Laboratory of Neuroscience, Faculty of Chemistry and Biology, Universidad de Santiago de Chile, Santiago, Chile
| | - Julio César Cárdenas
- Center for Geroscience, Brain Health, and Metabolism (GERO), Santiago, Chile; Department of Biology, Faculty of Sciences, Universidad de Chile, Santiago, Chile; The Buck Institute for Research on Aging, Novato, CA, USA; Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago, Chile; Department of Chemistry and Biochemistry and Center for Aging and Longevity Studies University of California, Santa Barbara, CA, USA
| | - Bernardo Morales
- Laboratory of Neuroscience, Faculty of Chemistry and Biology, Universidad de Santiago de Chile, Santiago, Chile
| | | | - John C Newman
- The Buck Institute for Research on Aging, Novato, CA, USA
| | - Christian González-Billault
- Center for Geroscience, Brain Health, and Metabolism (GERO), Santiago, Chile; Department of Biology, Faculty of Sciences, Universidad de Chile, Santiago, Chile; The Buck Institute for Research on Aging, Novato, CA, USA; Institute of Nutrition and Food Technology (INTA), Universidad de Chile, Santiago, Chile; Department of Neurosciences, Faculty of Medicine, Universidad de Chile, Santiago, Chile.
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Baysoy A, Seddu K, Salloum T, Dawson CA, Lee JJ, Yang L, Gal-oz S, Ner-Gaon H, Tellier J, Millan A, Sasse A, Brown B, Lanier LL, Shay T, Nutt S, Dwyer D, Benoist C. The interweaved signatures of common-gamma-chain cytokines across immunologic lineages. J Exp Med 2023; 220:e20222052. [PMID: 36976164 PMCID: PMC10067526 DOI: 10.1084/jem.20222052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 03/08/2023] [Accepted: 03/10/2023] [Indexed: 03/29/2023] Open
Abstract
"γc" cytokines are a family whose receptors share a "common-gamma-chain" signaling moiety, and play central roles in differentiation, homeostasis, and communications of all immunocyte lineages. As a resource to better understand their range and specificity of action, we profiled by RNAseq the immediate-early responses to the main γc cytokines across all immunocyte lineages. The results reveal an unprecedented landscape: broader, with extensive overlap between cytokines (one cytokine doing in one cell what another does elsewhere) and essentially no effects unique to any one cytokine. Responses include a major downregulation component and a broad Myc-controlled resetting of biosynthetic and metabolic pathways. Various mechanisms appear involved: fast transcriptional activation, chromatin remodeling, and mRNA destabilization. Other surprises were uncovered: IL2 effects in mast cells, shifts between follicular and marginal zone B cells, paradoxical and cell-specific cross-talk between interferon and γc signatures, or an NKT-like program induced by IL21 in CD8+ T cells.
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Affiliation(s)
- Alev Baysoy
- Department of Immunology, Harvard Medical School, Boston, MA, USA
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Kumba Seddu
- Department of Immunology, Harvard Medical School, Boston, MA, USA
| | - Tamara Salloum
- Division of Allergy and Clinical Immunology, Brigham and Women's Hospital; and Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Caleb A. Dawson
- The Walter and Eliza Hall Institute of Medical Researchand Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Juliana J. Lee
- Department of Immunology, Harvard Medical School, Boston, MA, USA
| | - Liang Yang
- Department of Immunology, Harvard Medical School, Boston, MA, USA
| | - Shani Gal-oz
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Hadas Ner-Gaon
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Julie Tellier
- The Walter and Eliza Hall Institute of Medical Researchand Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Alberto Millan
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA, USA
| | - Alexander Sasse
- Paul G. Allen School of Computer Science and Engineering, University of Washington, Seattle, WA, USA
| | - Brian Brown
- Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Lewis L. Lanier
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA, USA
| | - Tal Shay
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Stephen Nutt
- The Walter and Eliza Hall Institute of Medical Researchand Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Daniel Dwyer
- Division of Allergy and Clinical Immunology, Brigham and Women's Hospital; and Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Christophe Benoist
- Department of Immunology, Harvard Medical School, Boston, MA, USA
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
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Villalonga E, Mosrin C, Normand T, Girardin C, Serrano A, Žunar B, Doudeau M, Godin F, Bénédetti H, Vallée B. LIM Kinases, LIMK1 and LIMK2, Are Crucial Node Actors of the Cell Fate: Molecular to Pathological Features. Cells 2023; 12:cells12050805. [PMID: 36899941 PMCID: PMC10000741 DOI: 10.3390/cells12050805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 02/28/2023] [Accepted: 03/02/2023] [Indexed: 03/08/2023] Open
Abstract
LIM kinase 1 (LIMK1) and LIM kinase 2 (LIMK2) are serine/threonine and tyrosine kinases and the only two members of the LIM kinase family. They play a crucial role in the regulation of cytoskeleton dynamics by controlling actin filaments and microtubule turnover, especially through the phosphorylation of cofilin, an actin depolymerising factor. Thus, they are involved in many biological processes, such as cell cycle, cell migration, and neuronal differentiation. Consequently, they are also part of numerous pathological mechanisms, especially in cancer, where their involvement has been reported for a few years and has led to the development of a wide range of inhibitors. LIMK1 and LIMK2 are known to be part of the Rho family GTPase signal transduction pathways, but many more partners have been discovered over the decades, and both LIMKs are suspected to be part of an extended and various range of regulation pathways. In this review, we propose to consider the different molecular mechanisms involving LIM kinases and their associated signalling pathways, and to offer a better understanding of their variety of actions within the physiology and physiopathology of the cell.
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Affiliation(s)
- Elodie Villalonga
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Christine Mosrin
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Thierry Normand
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Caroline Girardin
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Amandine Serrano
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Bojan Žunar
- Laboratory for Biochemistry, Department of Chemistry and Biochemistry, Faculty of Food Technology and Biotechnology, University of Zagreb, 10000 Zagreb, Croatia
| | - Michel Doudeau
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Fabienne Godin
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Hélène Bénédetti
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Béatrice Vallée
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
- Correspondence: ; Tel.: +33-(0)2-38-25-76-11
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D’Incal C, Broos J, Torfs T, Kooy RF, Vanden Berghe W. Towards Kinase Inhibitor Therapies for Fragile X Syndrome: Tweaking Twists in the Autism Spectrum Kinase Signaling Network. Cells 2022; 11:cells11081325. [PMID: 35456004 PMCID: PMC9029738 DOI: 10.3390/cells11081325] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 04/01/2022] [Accepted: 04/03/2022] [Indexed: 12/12/2022] Open
Abstract
Absence of the Fragile X Mental Retardation Protein (FMRP) causes autism spectrum disorders and intellectual disability, commonly referred to as the Fragile X syndrome. FMRP is a negative regulator of protein translation and is essential for neuronal development and synapse formation. FMRP is a target for several post-translational modifications (PTMs) such as phosphorylation and methylation, which tightly regulate its cellular functions. Studies have indicated the involvement of FMRP in a multitude of cellular pathways, and an absence of FMRP was shown to affect several neurotransmitter receptors, for example, the GABA receptor and intracellular signaling molecules such as Akt, ERK, mTOR, and GSK3. Interestingly, many of these molecules function as protein kinases or phosphatases and thus are potentially amendable by pharmacological treatment. Several treatments acting on these kinase-phosphatase systems have been shown to be successful in preclinical models; however, they have failed to convincingly show any improvements in clinical trials. In this review, we highlight the different protein kinase and phosphatase studies that have been performed in the Fragile X syndrome. In our opinion, some of the paradoxical study conclusions are potentially due to the lack of insight into integrative kinase signaling networks in the disease. Quantitative proteome analyses have been performed in several models for the FXS to determine global molecular processes in FXS. However, only one phosphoproteomics study has been carried out in Fmr1 knock-out mouse embryonic fibroblasts, and it showed dysfunctional protein kinase and phosphatase signaling hubs in the brain. This suggests that the further use of phosphoproteomics approaches in Fragile X syndrome holds promise for identifying novel targets for kinase inhibitor therapies.
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Affiliation(s)
- Claudio D’Incal
- Protein Chemistry, Proteomics and Epigenetic Signaling (PPES), Department of Biomedical Sciences, University of Antwerp, 2000 Antwerp, Belgium; (C.D.); (J.B.); (T.T.)
- Department of Medical Genetics, University of Antwerp, 2000 Antwerp, Belgium;
| | - Jitse Broos
- Protein Chemistry, Proteomics and Epigenetic Signaling (PPES), Department of Biomedical Sciences, University of Antwerp, 2000 Antwerp, Belgium; (C.D.); (J.B.); (T.T.)
| | - Thierry Torfs
- Protein Chemistry, Proteomics and Epigenetic Signaling (PPES), Department of Biomedical Sciences, University of Antwerp, 2000 Antwerp, Belgium; (C.D.); (J.B.); (T.T.)
| | - R. Frank Kooy
- Department of Medical Genetics, University of Antwerp, 2000 Antwerp, Belgium;
| | - Wim Vanden Berghe
- Protein Chemistry, Proteomics and Epigenetic Signaling (PPES), Department of Biomedical Sciences, University of Antwerp, 2000 Antwerp, Belgium; (C.D.); (J.B.); (T.T.)
- Correspondence: ; Tel.: +0032-(0)-32-652-657
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LIMK1 Interacts with STK25 to Regulate EMT and Promote the Proliferation and Metastasis of Colorectal Cancer. JOURNAL OF ONCOLOGY 2022; 2022:3963883. [PMID: 35265128 PMCID: PMC8901301 DOI: 10.1155/2022/3963883] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 01/14/2022] [Accepted: 01/18/2022] [Indexed: 11/17/2022]
Abstract
Objective To investigate the interaction between LIMK1 and STK25 and its expression in colon cancer and its effect on the malignant evolution of colon cancer. Methods Fluorescence quantitative PCR and immunohistochemistry were used to detect the expression of the LIMK1 gene in cancer and adjacent tissues of 20 clinical colon cancer samples. The overexpression plasmids of LIMK1 and STK25 were constructed. An shRNA specific to LIMK1 was synthesized and transfected into colon cancer cell lines. The expression levels of EMT-related markers in cell lines were detected by real-time PCR. The effects of LIMK1 and STK25 on the proliferation and invasion of colon cancer cell lines were detected by CCK-8 assay, Transwell, and clonogenesis. Results LIMK1 interacted with STK25 and was highly expressed in colon cancer. High expression of LIMK1 and STK25 is associated with poor prognosis in colon cancer patients. LIMK silencing inhibits proliferation, invasion, and EMT of colon cancer. Cotransfection of LIMK1 and STK25 promotes the malignant progression and EMT of colon cancer. Conclusion Protein interaction between LIMK1 and STK25 occurs. Overexpression of LIMK1 and STK25 plays a role in promoting cell proliferation and invasion in colon cancer tissues and cells. They also play a role in promoting the occurrence and development of colon cancer.
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Fading memories in aging and neurodegeneration: Is p75 neurotrophin receptor a culprit? Ageing Res Rev 2022; 75:101567. [PMID: 35051645 DOI: 10.1016/j.arr.2022.101567] [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: 09/14/2021] [Revised: 12/12/2021] [Accepted: 01/12/2022] [Indexed: 11/22/2022]
Abstract
Aging and age-related neurodegenerative diseases have become one of the major concerns in modern times as cognitive abilities tend to decline when we get older. It is well known that the main cause of this age-related cognitive deficit is due to aberrant changes in cellular, molecular circuitry and signaling pathways underlying synaptic plasticity and neuronal connections. The p75 neurotrophin receptor (p75NTR) is one of the important mediators regulating the fate of the neurons in the nervous system. Its importance in neuronal apoptosis is well documented. However, the mechanisms involving the regulation of p75NTR in synaptic plasticity and cognitive function remain obscure, although cognitive impairment has been associated with a higher expression of p75NTR in neurons. In this review, we discuss the current understanding of how neurons are influenced by p75NTR function to maintain normal neuronal synaptic strength and connectivity, particularly to support learning and memory in the hippocampus. We then discuss the age-associated alterations in neurophysiological mechanisms of synaptic plasticity and cognitive function. Furthermore, we also describe current evidence that has begun to elucidate how p75NTR regulates synaptic changes in aging and age-related neurodegenerative diseases, focusing on the hippocampus. Elucidating the role that p75NTR signaling plays in regulating synaptic plasticity will contribute to a better understanding of cognitive processes and pathological conditions. This will in turn provide novel approaches to improve therapies for the treatment of neurological diseases in which p75NTR dysfunction has been demonstrated.
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LIM Kinases in Osteosarcoma Development. Cells 2021; 10:cells10123542. [PMID: 34944050 PMCID: PMC8699892 DOI: 10.3390/cells10123542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 12/06/2021] [Accepted: 12/10/2021] [Indexed: 12/17/2022] Open
Abstract
Tumorigenesis is a long-term and multistage process that often leads to the formation of metastases. During this pathological course, two major events appear to be crucial: primary tumour growth and metastatic expansion. In this context, despite research and clinical advances during the past decades, bone cancers remain a leading cause of death worldwide among paediatric cancer patients. Osteosarcomas are the most common malignant bone tumours in children and adolescents. Notwithstanding advances in therapeutic treatments, many patients succumb to these diseases. In particular, less than 30% of patients who demonstrate metastases at diagnosis or are poor responders to chemotherapy survive 5 years after initial diagnosis. LIM kinases (LIMKs), comprising LIMK1 and LIMK2, are common downstream effectors of several signalization pathways, and function as a signalling node that controls cytoskeleton dynamics through the phosphorylation of the cofilin family proteins. In recent decades, several reports have indicated that the functions of LIMKs are mainly implicated in the regulation of actin microfilament and the control of microtubule dynamics. Previous studies have thus identified LIMKs as cancer-promoting regulators in multiple organ cancers, such as breast cancer or prostate cancer. This review updates the current understanding of LIMK involvement in osteosarcoma progression.
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LIM-Kinases in Synaptic Plasticity, Memory, and Brain Diseases. Cells 2021; 10:cells10082079. [PMID: 34440848 PMCID: PMC8391678 DOI: 10.3390/cells10082079] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 07/30/2021] [Accepted: 08/04/2021] [Indexed: 12/12/2022] Open
Abstract
Learning and memory require structural and functional modifications of synaptic connections, and synaptic deficits are believed to underlie many brain disorders. The LIM-domain-containing protein kinases (LIMK1 and LIMK2) are key regulators of the actin cytoskeleton by affecting the actin-binding protein, cofilin. In addition, LIMK1 is implicated in the regulation of gene expression by interacting with the cAMP-response element-binding protein. Accumulating evidence indicates that LIMKs are critically involved in brain function and dysfunction. In this paper, we will review studies on the roles and underlying mechanisms of LIMKs in the regulation of long-term potentiation (LTP) and depression (LTD), the most extensively studied forms of long-lasting synaptic plasticity widely regarded as cellular mechanisms underlying learning and memory. We will also discuss the involvement of LIMKs in the regulation of the dendritic spine, the structural basis of synaptic plasticity, and memory formation. Finally, we will discuss recent progress on investigations of LIMKs in neurological and mental disorders, including Alzheimer’s, Parkinson’s, Williams–Beuren syndrome, schizophrenia, and autism spectrum disorders.
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Articular Chondrocyte Phenotype Regulation through the Cytoskeleton and the Signaling Processes That Originate from or Converge on the Cytoskeleton: Towards a Novel Understanding of the Intersection between Actin Dynamics and Chondrogenic Function. Int J Mol Sci 2021; 22:ijms22063279. [PMID: 33807043 PMCID: PMC8004672 DOI: 10.3390/ijms22063279] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 03/16/2021] [Accepted: 03/17/2021] [Indexed: 02/08/2023] Open
Abstract
Numerous studies have assembled a complex picture, in which extracellular stimuli and intracellular signaling pathways modulate the chondrocyte phenotype. Because many diseases are mechanobiology-related, this review asked to what extent phenotype regulators control chondrocyte function through the cytoskeleton and cytoskeleton-regulating signaling processes. Such information would generate leverage for advanced articular cartilage repair. Serial passaging, pro-inflammatory cytokine signaling (TNF-α, IL-1α, IL-1β, IL-6, and IL-8), growth factors (TGF-α), and osteoarthritis not only induce dedifferentiation but also converge on RhoA/ROCK/Rac1/mDia1/mDia2/Cdc42 to promote actin polymerization/crosslinking for stress fiber (SF) formation. SF formation takes center stage in phenotype control, as both SF formation and SOX9 phosphorylation for COL2 expression are ROCK activity-dependent. Explaining how it is molecularly possible that dedifferentiation induces low COL2 expression but high SF formation, this review theorized that, in chondrocyte SOX9, phosphorylation by ROCK might effectively be sidelined in favor of other SF-promoting ROCK substrates, based on a differential ROCK affinity. In turn, actin depolymerization for redifferentiation would “free-up” ROCK to increase COL2 expression. Moreover, the actin cytoskeleton regulates COL1 expression, modulates COL2/aggrecan fragment generation, and mediates a fibrogenic/catabolic expression profile, highlighting that actin dynamics-regulating processes decisively control the chondrocyte phenotype. This suggests modulating the balance between actin polymerization/depolymerization for therapeutically controlling the chondrocyte phenotype.
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Okuda K, Højgaard K, Privitera L, Bayraktar G, Takeuchi T. Initial memory consolidation and the synaptic tagging and capture hypothesis. Eur J Neurosci 2020; 54:6826-6849. [PMID: 32649022 DOI: 10.1111/ejn.14902] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 06/17/2020] [Accepted: 06/29/2020] [Indexed: 01/05/2023]
Abstract
Everyday memories are retained automatically in the hippocampus and then decay very rapidly. Memory retention can be boosted when novel experiences occur shortly before or shortly after the time of memory encoding via a memory stabilization process called "initial memory consolidation." The dopamine release and new protein synthesis in the hippocampus during a novel experience are crucial for this novelty-induced memory boost. The mechanisms underlying initial memory consolidation are not well-understood, but the synaptic tagging and capture (STC) hypothesis provides a conceptual basis of synaptic plasticity events occurring during initial memory consolidation. In this review, we provide an overview of the STC hypothesis and its relevance to dopaminergic signalling, in order to explore the cellular and molecular mechanisms underlying initial memory consolidation in the hippocampus. We summarize electrophysiological STC processes based on the evidence from two-pathway experiments and a behavioural tagging hypothesis, which translates the STC hypothesis into a related behavioural hypothesis. We also discuss the function of two types of molecules, "synaptic tags" and "plasticity-related proteins," which have a crucial role in the STC process and initial memory consolidation. We describe candidate molecules for the roles of synaptic tag and plasticity-related proteins and interpret their candidacy based on evidence from two-pathway experiments ex vivo, behavioural tagging experiments in vivo and recent cutting-edge optical imaging experiments. Lastly, we discuss the direction of future studies to advance our understanding of molecular mechanisms underlying the STC process, which are critical for initial memory consolidation in the hippocampus.
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Affiliation(s)
- Kosuke Okuda
- Department of Biomedicine, Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus C, Denmark
| | - Kristoffer Højgaard
- Department of Biomedicine, Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus C, Denmark.,Translational Neuropsychiatry Unit, Department of Clinical Medicine, Aarhus University, Aarhus C, Denmark
| | - Lucia Privitera
- Centre for Discovery Brain Sciences, University of Edinburgh, Edinburgh, UK.,School of Medicine, Ninewells Hospital, University of Dundee, Dundee, UK
| | - Gülberk Bayraktar
- Department of Biomedicine, Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus C, Denmark.,Institut für Klinische Neurobiologie, Universitätsklinikum Würzburg, Würzburg, Germany
| | - Tomonori Takeuchi
- Department of Biomedicine, Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus C, Denmark
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Li ZF, Yao YD, Zhao YY, Liu Y, Liu ZH, Hu P, Zhu ZR. Effects of PAK4/LIMK1/Cofilin-1 signaling pathway on proliferation, invasion, and migration of human osteosarcoma cells. J Clin Lab Anal 2020; 34:e23362. [PMID: 32463132 PMCID: PMC7521293 DOI: 10.1002/jcla.23362] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 04/16/2020] [Accepted: 04/22/2020] [Indexed: 02/02/2023] Open
Abstract
Purpose To explore the effects of PAK4/LIMK1/Cofilin‐1 signaling pathway on the proliferation, invasion, and migration of human osteosarcoma cells. Methods The expression of PAK4/LIMK1/Cofilin‐1 was detected by immunohistochemistry in osteosarcoma tissues. The osteosarcoma cell line MG63 was transfected and divided into Mock, Control siRNA, si‐PAK4, LIMK1, and si‐PAK4+LIMK1 groups. Then, the cellular biological features of MG63 cells were detected by CCK‐8, wound‐healing, Transwell, and flow cytometry methods. The relationship of PAK4 and LIMK1 was performed by co‐immunoprecipitation test, and the protein expression of PAK4/LIMK1/Cofilin‐1 was determined by Western blotting. Finally, the effect of PAK4 on the growth of osteosarcoma was verified by subcutaneous transplantation model of osteosarcoma in nude mice. Results The expression of PAK4/LIMK1/Cofilin‐1 in both osteosarcoma tissues and cells was up‐regulated. Positive PAK4, LIMK1, and Cofilin‐1 expressions in osteosarcoma were associated with the clinical stage, distant metastasis, and tumor grade. The MG63 cell viability, migration, and invasion, as well as the expression of PAK4, p‐LIMK/LIMK, and p‐Cofilin‐1/Cofilin‐1, were restrained by the knock down of PAK4 while it promoted apoptosis. PAK4 silencing also suppressed the growth of subcutaneous transplanted tumor in nude mice. Co‐immunocoprecipitation showed that LIMK and PAK4 protein can form complex in osteosarcoma cells. Besides, LIMK1 overexpression reversed the inhibition effect of PAK4 siRNA on the growth of osteosarcoma cells. Conclusion The expression of PAK4/LIMK1/Cofilin‐1 pathway in osteosarcoma tissues was up‐regulated. Thus, PAK4 inhibition may restrict the osteosarcoma cell proliferation, invasion, and migration but promote its apoptosis via decreasing the activity of LIMK1/Cofilin‐1 pathway.
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Affiliation(s)
- Zhi-Feng Li
- Department of Orthopedics, Taihe Hospital, Hubei University of Medicine, Shiyan, China
| | - Yin-Di Yao
- College of Nursing, Hubei University of Medicine, Shiyan, China
| | - Yin-Yin Zhao
- Department of Gynecology and Obstetrics, Taihe Hospital, Hubei University of Medicine, Shiyan, China
| | - Yan Liu
- Department of Respiratory Medicine, Taihe Hospital, Hubei University of Medicine, Shiyan, China
| | - Zhen-Hua Liu
- Department of Radiology, Renmin Hospital, Hubei University of Medicine, Shiyan, China
| | - Pei Hu
- Department of Ultrasound, Renmin Hospital, Hubei University of Medicine, Shiyan, China
| | - Zhuo-Ran Zhu
- Department of Anatomy, Basic Medical College, Hubei University of Medicine, Shiyan, China
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12
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Pinho J, Marcut C, Fonseca R. Actin remodeling, the synaptic tag and the maintenance of synaptic plasticity. IUBMB Life 2020; 72:577-589. [DOI: 10.1002/iub.2261] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 02/06/2020] [Indexed: 12/30/2022]
Affiliation(s)
- Júlia Pinho
- Cellular and Systems Neurobiology, Chronic Disease Research CenterNOVA Medical School Lisbon Portugal
| | - Cristina Marcut
- Cellular and Systems Neurobiology, Chronic Disease Research CenterNOVA Medical School Lisbon Portugal
| | - Rosalina Fonseca
- Cellular and Systems Neurobiology, Chronic Disease Research CenterNOVA Medical School Lisbon Portugal
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13
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Zivkovic M, Zlatanovic M, Zlatanovic N, Djordjevic Jocic J, Golubović M, Veselinović AM. Development of novel therapeutics for the treatment of glaucoma based on actin-binding kinase inhibition – in silico approach. NEW J CHEM 2020. [DOI: 10.1039/c9nj05967a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
QSAR modeling with computer-aided drug design were used for the in silico development of novel therapeutics for glaucoma treatment.
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Affiliation(s)
- Maja Zivkovic
- Faculty of Medicine
- Department of Ophthalmology
- University of Nis
- Nis
- Serbia
| | | | | | | | - Mladjan Golubović
- Clinic for Anesthesiology and Intensive Care
- Clinical Center Nis
- Nis
- Serbia
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14
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Xia L, Lin J, Su J, Oyang L, Wang H, Tan S, Tang Y, Chen X, Liu W, Luo X, Tian Y, Liang J, Su Q, Liao Q, Zhou Y. Diallyl disulfide inhibits colon cancer metastasis by suppressing Rac1-mediated epithelial-mesenchymal transition. Onco Targets Ther 2019; 12:5713-5728. [PMID: 31410018 PMCID: PMC6645609 DOI: 10.2147/ott.s208738] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 06/06/2019] [Indexed: 12/14/2022] Open
Abstract
Background Prevention of epithelial-mesenchymal transition (EMT) provides a novel treatment strategy for tumor metastasis. Our previous studies have shown that diallyl disulfide (DADS) inhibits Ras related C3 botulinum toxin substrate1 (Rac1) expression, being a potential agent that suppresses migration and invasion of colon cancer cells. The study provides information on the underlying mechanisms. Methods The expression of Rac1 and EMT markers (vimentin, N-cadherin and E-cadherin) in colon cancer samples was detected. Colon cancer cell lines treated with or without DADS were used to examine EMT markers, Rac1 and its related molecules. Various cell functions related to metastasis were performed in vitro, and further confirmed in vivo. Results Rac1 was highly expressed in colon cancer, and associated with aberrant expression of EMT markers and poor prognosis. Rac1 overexpression induced cell migration and invasion in vitro and metastasis in vivo with down-regulation of E-cadherin and up-regulation of N-cadherin, vimentin, and snail1, whereas inhibition of Rac1 impaired the oncogenic function. DADS suppressed Rac1 expression and activity via inhibition of PI3K/Akt pathway, thus suppressing EMT and invasion and migration of colon cancer cells. The tumor inhibition of DADS was enhanced by knockdown of Rac1, but antagonized by overexpression of Rac1. We further found that DADS blocked EMT via targeting the Rac1-mediated PAK1-LIMK1-Cofilins signaling. Conclusion Rac1 is a potential target molecule for the inhibitory effect of DADS on EMT and invasion and metastasis of colon cancer cells.
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Affiliation(s)
- Longzheng Xia
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
| | - Jingguan Lin
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
| | - Jian Su
- Cancer Research Institute, University of South China, Hengyang, Hunan, People's Republic of China
| | - Linda Oyang
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
| | - Heran Wang
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
| | - Shiming Tan
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
| | - Yanyan Tang
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
| | - Xiaoyan Chen
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
| | - Wenbin Liu
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
| | - Xia Luo
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
| | - Yutong Tian
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
| | - Jiaxin Liang
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
| | - Qi Su
- Cancer Research Institute, University of South China, Hengyang, Hunan, People's Republic of China
| | - Qianjin Liao
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
| | - Yujuan Zhou
- Key Laboratory of Translational Radiation Oncology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University and Hunan Cancer Hospital, Changsha 410013, Hunan, People's Republic of China
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15
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Wong LW, Tann JY, Ibanez CF, Sajikumar S. The p75 Neurotrophin Receptor Is an Essential Mediator of Impairments in Hippocampal-Dependent Associative Plasticity and Memory Induced by Sleep Deprivation. J Neurosci 2019; 39:5452-5465. [PMID: 31085607 PMCID: PMC6616296 DOI: 10.1523/jneurosci.2876-18.2019] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 05/08/2019] [Accepted: 05/09/2019] [Indexed: 01/22/2023] Open
Abstract
Sleep deprivation (SD) interferes with hippocampal structural and functional plasticity, formation of long-term memory and cognitive function. The molecular mechanisms underlying these effects are incompletely understood. Here, we show that SD impaired synaptic tagging and capture and behavioral tagging, two major mechanisms of associative learning and memory. Strikingly, mutant male mice lacking the p75 neurotrophin receptor (p75NTR) were resistant to the detrimental effects of SD on hippocampal plasticity at both cellular and behavioral levels. Mechanistically, SD increased p75NTR expression and its interaction with phosphodiesterase. p75NTR deletion preserved hippocampal structural and functional plasticity by preventing SD-mediated effects on hippocampal cAMP-CREB-BDNF, cAMP-PKA-LIMK1-cofilin, and RhoA-ROCK2 pathways. Our study identifies p75NTR as an important mediator of hippocampal structural and functional changes associated with SD, and suggests that targeting p75NTR could be a promising strategy to limit the memory and cognitive deficits that accompany sleep loss.SIGNIFICANCE STATEMENT The lack of sufficient sleep is a major health concern in today's world. Sleep deprivation (SD) affects cognitive functions such as memory. We have investigated how associative memory mechanisms, synaptic tagging and capture (STC), was impaired in SD mice at cellular and behavioral level. Interestingly, mutant male mice that lacked the p75 neurotrophin receptor (p75NTR) were seen to be resistant to the SD-induced impairments in hippocampal synaptic plasticity and STC. Additionally, we elucidated the molecular pathways responsible for this rescue of plasticity in the mutant mice. Our study has thus identified p75NTR as a promising target to limit the cognitive deficits associated with SD.
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Affiliation(s)
- Lik-Wei Wong
- Department of Physiology, National University of Singapore, Singapore 117597, Singapore
- Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore 117456, and
| | - Jason Y Tann
- Department of Physiology, National University of Singapore, Singapore 117597, Singapore
- Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore 117456, and
| | - Carlos F Ibanez
- Department of Physiology, National University of Singapore, Singapore 117597, Singapore
- Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore 117456, and
- Department of Cell and Molecular Biology, Karolinska Institute, Stockholm S-17177, Sweden
| | - Sreedharan Sajikumar
- Department of Physiology, National University of Singapore, Singapore 117597, Singapore,
- Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore 117456, and
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16
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Leptin-induced Trafficking of K ATP Channels: A Mechanism to Regulate Pancreatic β-cell Excitability and Insulin Secretion. Int J Mol Sci 2019; 20:ijms20112660. [PMID: 31151172 PMCID: PMC6600549 DOI: 10.3390/ijms20112660] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Revised: 05/25/2019] [Accepted: 05/27/2019] [Indexed: 11/17/2022] Open
Abstract
The adipocyte hormone leptin was first recognized for its actions in the central nervous system to regulate energy homeostasis but has since been shown to have direct actions on peripheral tissues. In pancreatic β-cells leptin suppresses insulin secretion by increasing KATP channel conductance, which causes membrane hyperpolarization and renders β-cells electrically silent. However, the mechanism by which leptin increases KATP channel conductance had remained unresolved for many years following the initial observation. Recent studies have revealed that leptin increases surface abundance of KATP channels by promoting channel trafficking to the β-cell membrane. Thus, KATP channel trafficking regulation has emerged as a mechanism by which leptin increases KATP channel conductance to regulate β-cell electrical activity and insulin secretion. This review will discuss the leptin signaling pathway that underlies KATP channel trafficking regulation in β-cells.
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17
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From membrane receptors to protein synthesis and actin cytoskeleton: Mechanisms underlying long lasting forms of synaptic plasticity. Semin Cell Dev Biol 2019; 95:120-129. [PMID: 30634048 DOI: 10.1016/j.semcdb.2019.01.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 01/07/2019] [Accepted: 01/08/2019] [Indexed: 12/13/2022]
Abstract
Synaptic plasticity, the activity dependent change in synaptic strength, forms the molecular foundation of learning and memory. Synaptic plasticity includes structural changes, with spines changing their size to accomodate insertion and removal of postynaptic receptors, which are correlated with functional changes. Of particular relevance for memory storage are the long lasting forms of synaptic plasticity which are protein synthesis dependent. Due to the importance of spine structural plasticity and protein synthesis, this review focuses on the signaling pathways that connect synaptic stimulation with regulation of protein synthesis and remodeling of the actin cytoskeleton. We also review computational models that implement novel aspects of molecular signaling in synaptic plasticity, such as the role of neuromodulators and spatial microdomains, as well as highlight the need for computational models that connect activation of memory kinases with spine actin dynamics.
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18
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Coumans JVF, Davey RJ, Moens PDJ. Cofilin and profilin: partners in cancer aggressiveness. Biophys Rev 2018; 10:1323-1335. [PMID: 30027463 DOI: 10.1007/s12551-018-0445-0] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 07/08/2018] [Indexed: 02/07/2023] Open
Abstract
This review covers aspects of cofilin and profilin regulations and their influence on actin polymerisation responsible for cell motility and metastasis. The regulation of their activity by phosphorylation and nitration, miRs, PI(4,5)P2 binding, pH, oxidative stress and post-translational modification is described. In this review, we have highlighted selected similarities, complementarities and differences between the two proteins and how their interplay affects actin filament dynamics.
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Affiliation(s)
- Joelle V F Coumans
- School of Rural Medicine, University of New England, Armidale, Australia
| | - Rhonda J Davey
- Centre for Bioactive Discovery in Health and Ageing, School of Science and Technology, University of New England, Armidale, Australia
| | - Pierre D J Moens
- Centre for Bioactive Discovery in Health and Ageing, School of Science and Technology, University of New England, Armidale, Australia.
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19
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Cofilin Knockdown Attenuates Hemorrhagic Brain Injury-induced Oxidative Stress and Microglial Activation in Mice. Neuroscience 2018; 383:33-45. [DOI: 10.1016/j.neuroscience.2018.04.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 04/25/2018] [Accepted: 04/26/2018] [Indexed: 11/22/2022]
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20
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Blackwell KT, Salinas AG, Tewatia P, English B, Hellgren Kotaleski J, Lovinger DM. Molecular mechanisms underlying striatal synaptic plasticity: relevance to chronic alcohol consumption and seeking. Eur J Neurosci 2018; 49:768-783. [PMID: 29602186 DOI: 10.1111/ejn.13919] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 03/19/2018] [Accepted: 03/20/2018] [Indexed: 01/02/2023]
Abstract
The striatum, the input structure of the basal ganglia, is a major site of learning and memory for goal-directed actions and habit formation. Spiny projection neurons of the striatum integrate cortical, thalamic, and nigral inputs to learn associations, with cortico-striatal synaptic plasticity as a learning mechanism. Signaling molecules implicated in synaptic plasticity are altered in alcohol withdrawal, which may contribute to overly strong learning and increased alcohol seeking and consumption. To understand how interactions among signaling molecules produce synaptic plasticity, we implemented a mechanistic model of signaling pathways activated by dopamine D1 receptors, acetylcholine receptors, and glutamate. We use our novel, computationally efficient simulator, NeuroRD, to simulate stochastic interactions both within and between dendritic spines. Dopamine release during theta burst and 20-Hz stimulation was extrapolated from fast-scan cyclic voltammetry data collected in mouse striatal slices. Our results show that the combined activity of several key plasticity molecules correctly predicts the occurrence of either LTP, LTD, or no plasticity for numerous experimental protocols. To investigate spatial interactions, we stimulate two spines, either adjacent or separated on a 20-μm dendritic segment. Our results show that molecules underlying LTP exhibit spatial specificity, whereas 2-arachidonoylglycerol exhibits a spatially diffuse elevation. We also implement changes in NMDA receptors, adenylyl cyclase, and G protein signaling that have been measured following chronic alcohol treatment. Simulations under these conditions suggest that the molecular changes can predict changes in synaptic plasticity, thereby accounting for some aspects of alcohol use disorder.
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Affiliation(s)
- Kim T Blackwell
- The Krasnow Institute for Advanced Study, George Mason University, Fairfax, VA, USA.,Department of Bioengineering, George Mason University, Fairfax, VA, USA
| | - Armando G Salinas
- The Krasnow Institute for Advanced Study, George Mason University, Fairfax, VA, USA.,National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD, USA
| | - Parul Tewatia
- Science for Life Laboratory, School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Brad English
- The Krasnow Institute for Advanced Study, George Mason University, Fairfax, VA, USA
| | - Jeanette Hellgren Kotaleski
- Science for Life Laboratory, School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology, Stockholm, Sweden
| | - David M Lovinger
- National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD, USA
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21
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Ziesemer S, Eiffler I, Schönberg A, Müller C, Hochgräfe F, Beule AG, Hildebrandt JP. Staphylococcus aureusα-Toxin Induces Actin Filament Remodeling in Human Airway Epithelial Model Cells. Am J Respir Cell Mol Biol 2018; 58:482-491. [DOI: 10.1165/rcmb.2016-0207oc] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Affiliation(s)
- Sabine Ziesemer
- Animal Physiology and Biochemistry, Zoological Institute, and
| | - Ina Eiffler
- Animal Physiology and Biochemistry, Zoological Institute, and
| | | | | | - Falko Hochgräfe
- Junior Research Group Pathoproteomics, Competence Center Functional Genomics, Ernst-Moritz-Arndt-University, Greifswald, Germany
| | - Achim G. Beule
- Department of Otorhinolaryngology, Head and Neck Surgery, Greifswald University Hospital, Greifswald, Germany; and
- Department of Otorhinolaryngology, University Hospital, Münster, Germany
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22
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Breitbart H, Finkelstein M. Actin cytoskeleton and sperm function. Biochem Biophys Res Commun 2017; 506:372-377. [PMID: 29102633 DOI: 10.1016/j.bbrc.2017.11.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 11/01/2017] [Indexed: 11/17/2022]
Abstract
For the acquisition of the ability to fertilize the egg, mammalian spermatozoa should undergo a series of biochemical transformations in the female reproductive tract, collectively called capacitation. The capacitated sperm can undergo the acrosomal exocytosis process near or on the oocyte, which allows the spermatozoon to penetrate and fertilize it. One of the main processes in capacitation involves dynamic cytoskeletal remodeling particularly of actin. Actin polymerization occurs during sperm capacitation and the produced F-actin should be depolymerized prior to the acrosomal exocytosis. In the present review, we describe the mechanisms that regulate F-actin formation during sperm capacitation and the F-actin dispersion prior to the acrosomal exocytosis. During sperm capacitation, the actin severing proteins gelsolin and cofilin are inactive and they undergo activation prior to the acrosomal exocytosis.
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Affiliation(s)
- Haim Breitbart
- The Mina & Everard Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel.
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23
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Peverelli E, Catalano R, Giardino E, Treppiedi D, Morelli V, Ronchi CL, Vaczlavik A, Fusco N, Ferrero S, Bertherat J, Beuschlein F, Chiodini I, Arosio M, Spada A, Mantovani G. Cofilin is a cAMP effector in mediating actin cytoskeleton reorganization and steroidogenesis in mouse and human adrenocortical tumor cells. Cancer Lett 2017; 406:54-63. [PMID: 28826686 DOI: 10.1016/j.canlet.2017.07.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 07/20/2017] [Accepted: 07/27/2017] [Indexed: 11/17/2022]
Abstract
cAMP pathway plays a major role in the pathogenesis of cortisol-producing adrenocortical adenomas (CPA). cAMP-induced steroidogenesis is preceded by actin cytoskeleton reorganization, a process regulated by cofilin activity. In this study we investigated cofilin role in mediating cAMP effects on cell morphology and steroidogenesis in adrenocortical tumor cells. We demonstrated that forskolin induced cell rounding and strongly reduced phosphorylated (P)-cofilin/total cofilin ratio in Y1 (-52 ± 16%, p < 0.001) and human CPA cells (-53 ± 18%, p < 0.05). Cofilin silencing significantly reduced both forskolin-induced morphological changes and progesterone production (1.3-fold vs 1.8-fold in controls, p < 0.05), whereas transfection of wild-type or S3A (active), but not S3D (inactive) cofilin, potentiated forskolin effects on cell rounding and increased 3-fold progesterone synthesis with respect to control (p < 0.05). Furthermore, cofilin dephosphorylation by a ROCK inhibitor potentiated forskolin-induced cell rounding and steroidogenesis (2-fold increase vs forskolin alone). Finally, we found a reduced P-cofilin/total cofilin ratio and increased cofilin expression in CPA vs endocrine inactive adenomas by western blot and immunohistochemistry. Overall, these results identified cofilin as a mediator of cAMP effects on both morphological changes and steroidogenesis in mouse and human adrenocortical tumor cells.
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Affiliation(s)
- E Peverelli
- Endocrine Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy; Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy.
| | - R Catalano
- Endocrine Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy; Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - E Giardino
- Endocrine Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy; Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - D Treppiedi
- Endocrine Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy; Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - V Morelli
- Endocrine Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy; Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - C L Ronchi
- Department of Internal Medicine I, Division of Endocrinology and Diabetes, University Hospital, University of Wuerzburg, Wuerzburg, Germany
| | - A Vaczlavik
- Institut Cochin, Inserm U1016, CNRS UMR8104, Descartes University, Paris, France; Department of Endocrinology, Reference Center for Rare Adrenal Diseases, Hôpital Cochin, Paris, France
| | - N Fusco
- Division of Pathology, Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico, Milan, Italy; Department of Biomedical, Surgical and Dental Sciences, University of Milan Medical School, Milan, Italy
| | - S Ferrero
- Division of Pathology, Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico, Milan, Italy; Department of Biomedical, Surgical and Dental Sciences, University of Milan Medical School, Milan, Italy
| | - J Bertherat
- Institut Cochin, Inserm U1016, CNRS UMR8104, Descartes University, Paris, France; Department of Endocrinology, Reference Center for Rare Adrenal Diseases, Hôpital Cochin, Paris, France
| | - F Beuschlein
- Medizinische Klinik und Poliklinik IV, Endocrine Research Unit, Klinikum der Universität München, LMU, Munich, Germany
| | - I Chiodini
- Endocrine Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy; Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - M Arosio
- Endocrine Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy; Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - A Spada
- Endocrine Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy; Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - G Mantovani
- Endocrine Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy; Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
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24
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Jȩdrzejewska-Szmek J, Luczak V, Abel T, Blackwell KT. β-adrenergic signaling broadly contributes to LTP induction. PLoS Comput Biol 2017; 13:e1005657. [PMID: 28742159 PMCID: PMC5546712 DOI: 10.1371/journal.pcbi.1005657] [Citation(s) in RCA: 23] [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: 10/07/2016] [Revised: 08/07/2017] [Accepted: 06/27/2017] [Indexed: 12/18/2022] Open
Abstract
Long-lasting forms of long-term potentiation (LTP) represent one of the major cellular mechanisms underlying learning and memory. One of the fundamental questions in the field of LTP is why different molecules are critical for long-lasting forms of LTP induced by diverse experimental protocols. Further complexity stems from spatial aspects of signaling networks, such that some molecules function in the dendrite and some are critical in the spine. We investigated whether the diverse experimental evidence can be unified by creating a spatial, mechanistic model of multiple signaling pathways in hippocampal CA1 neurons. Our results show that the combination of activity of several key kinases can predict the occurrence of long-lasting forms of LTP for multiple experimental protocols. Specifically Ca2+/calmodulin activated kinase II, protein kinase A and exchange protein activated by cAMP (Epac) together predict the occurrence of LTP in response to strong stimulation (multiple trains of 100 Hz) or weak stimulation augmented by isoproterenol. Furthermore, our analysis suggests that activation of the β-adrenergic receptor either via canonical (Gs-coupled) or non-canonical (Gi-coupled) pathways underpins most forms of long-lasting LTP. Simulations make the experimentally testable prediction that a complete antagonist of the β-adrenergic receptor will likely block long-lasting LTP in response to strong stimulation. Collectively these results suggest that converging molecular mechanisms allow CA1 neurons to flexibly utilize signaling mechanisms best tuned to temporal pattern of synaptic input to achieve long-lasting LTP and memory storage. Long-term potentiation of the strength of synaptic connections is a mechanism of learning and memory storage. One of the most confusing aspects of hippocampal synaptic potentiation is that numerous experiments have revealed the requirement for a plethora of signaling molecules. Furthermore the degree to which molecules activated by the stress response modify hippocampal synaptic potentiation and memory is still unclear. We used a computational model to demonstrate that this molecular diversity can be explained by considering a combination of several key molecules. We also show that activation of β-adrenergic receptors by the stress response appears to be involved in most forms of synaptic potentiation, though in some cases unconventional mechanisms are utilized. This suggests that novel treatments for stress-related disorders may have more success if they target unconventional mechanisms activated by β-adrenergic receptors.
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Affiliation(s)
- Joanna Jȩdrzejewska-Szmek
- The Krasnow Institute for Advanced Studies, George Mason University, Fairfax, Virginia, United States of America
| | - Vincent Luczak
- Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Ted Abel
- Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Kim T Blackwell
- The Krasnow Institute for Advanced Studies, George Mason University, Fairfax, Virginia, United States of America
- * E-mail:
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25
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Niikura K, Alam MS, Naruse M, Jimbo M, Moriyama H, Reich A, Wessel GM, Matsumoto M. Protein kinase A activity leads to the extension of the acrosomal process in starfish sperm. Mol Reprod Dev 2017; 84:614-625. [PMID: 28462533 DOI: 10.1002/mrd.22824] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Accepted: 04/26/2017] [Indexed: 01/04/2023]
Abstract
Acrosomal vesicles (AVs) of sperm undergo exocytosis during the acrosome reaction, which is immediately followed by the actin polymerization-dependent extension of an acrosomal process (AP) in echinoderm sperm. In the starfish Asterias amurensis, a large proteoglycan, acrosome reaction-inducing substance (ARIS), together with asteroidal sperm-activating peptide (asterosap) and/or cofactor for ARIS, induces the acrosome reaction. Asterosap induces a transient elevation of intracellular cGMP and Ca2+ levels, and, together with ARIS, causes a sustained increase in intracellular cAMP and Ca2+ . Yet, the contribution of signaling molecules downstream of cAMP and Ca2+ in inducing AV exocytosis and AP extension remain unknown. A modified acrosome reaction assay was used here to differentiate between AV exocytosis and AP extension in starfish sperm, leading to the discovery that Protein kinase A (PKA) inhibitors block AP extension but not AV exocytosis. Additionally, PKA-mediated phosphorylation of target proteins occurs, and these substrates localize at the base of the AP, demonstrating that PKA activation regulates an AP extension step during the acrosome reaction. The major PKA substrate was further identified, from A. amurensis and Asterias forbesi sperm, as a novel protein containing six PKA phosphorylation motifs. This protein, referred to as PKAS1, likely plays a key role in AP actin polymerization during the acrosome reaction.
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Affiliation(s)
- Keisuke Niikura
- Department of Biological Sciences and Informatics, Keio University, Yokohama, Japan
| | - M Shahanoor Alam
- Department of Biological Sciences and Informatics, Keio University, Yokohama, Japan
| | - Masahiro Naruse
- Department of Biological Sciences and Informatics, Keio University, Yokohama, Japan
| | - Mitsuru Jimbo
- School of Marine Biosciences, Kitasato University, Sagamihara, Kanagawa, Japan
| | - Hideaki Moriyama
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska
| | - Adrian Reich
- Department of Molecular Biology, Cellular Biology and Biochemistry, Brown University, Providence, Rhode Island
| | - Gary M Wessel
- Department of Molecular Biology, Cellular Biology and Biochemistry, Brown University, Providence, Rhode Island
| | - Midori Matsumoto
- Department of Biological Sciences and Informatics, Keio University, Yokohama, Japan
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26
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Scavello M, Petlick AR, Ramesh R, Thompson VF, Lotfi P, Charest PG. Protein kinase A regulates the Ras, Rap1 and TORC2 pathways in response to the chemoattractant cAMP in Dictyostelium. J Cell Sci 2017; 130:1545-1558. [PMID: 28302905 PMCID: PMC5450229 DOI: 10.1242/jcs.177170] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Accepted: 03/06/2017] [Indexed: 12/19/2022] Open
Abstract
Efficient directed migration requires tight regulation of chemoattractant signal transduction pathways in both space and time, but the mechanisms involved in such regulation are not well understood. Here, we investigated the role of protein kinase A (PKA) in controlling signaling of the chemoattractant cAMP in Dictyostelium discoideum We found that cells lacking PKA display severe chemotaxis defects, including impaired directional sensing. Although PKA is an important regulator of developmental gene expression, including the cAMP receptor cAR1, our studies using exogenously expressed cAR1 in cells lacking PKA, cells lacking adenylyl cyclase A (ACA) and cells treated with the PKA-selective pharmacological inhibitor H89, suggest that PKA controls chemoattractant signal transduction, in part, through the regulation of RasG, Rap1 and TORC2. As these pathways control the ACA-mediated production of intracellular cAMP, they lie upstream of PKA in this chemoattractant signaling network. Consequently, we propose that the PKA-mediated regulation of the upstream RasG, Rap1 and TORC2 signaling pathways is part of a negative feedback mechanism controlling chemoattractant signal transduction during Dictyostelium chemotaxis.
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Affiliation(s)
- Margarethakay Scavello
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721-0088, USA
| | - Alexandra R Petlick
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721-0088, USA
| | - Ramya Ramesh
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721-0088, USA
| | - Valery F Thompson
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721-0088, USA
| | - Pouya Lotfi
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721-0088, USA
| | - Pascale G Charest
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721-0088, USA
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27
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Su J, Zhou Y, Pan Z, Shi L, Yang J, Liao A, Liao Q, Su Q. Downregulation of LIMK1-ADF/cofilin by DADS inhibits the migration and invasion of colon cancer. Sci Rep 2017; 7:45624. [PMID: 28358024 PMCID: PMC5372356 DOI: 10.1038/srep45624] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 03/01/2017] [Indexed: 12/25/2022] Open
Abstract
This study aimed to explore whether the downregulation of LIM kinase 1 (LIMK1)-actin depolymerization factor (ADF, also known as destrin)/cofilin by diallyl disulfide (DADS) inhibited the migration and invasion of colon cancer. Previous studies have shown that silencing LIMK1 could significantly enhance the inhibitory effect of DADS on colon cancer cell migration and invasion, suggesting that LIMK1 was a target molecule of DADS, which needed further confirmation. This study reported that LIMK1 and destrin were highly expressed in colon cancer and associated with poor prognosis of patients with colon cancer. Also, the expression of LIMK1 was positively correlated with the expression of destrin. The overexpression of LIMK1 significantly promoted colon cancer cell migration and invasion. DADS obviously inhibited migration and invasion by suppressing the phosphorylation of ADF/cofilin via downregulation of LIMK1 in colon cancer cells. Furthermore, DADS-induced suppression of cell proliferation was enhanced and antagonized by the knockdown and overexpression of LIMK1 in vitro and in vivo, respectively. Similar results were observed for DADS-induced changes in the expression of vimentin, CD34, Ki-67, and E-cadherin in xenografted tumors. These results indicated that LIMK1 was a potential target molecule for the inhibitory effect of DADS on colon cancer cell migration and invasion.
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Affiliation(s)
- Jian Su
- Department of Pathology, The Second Affiliated Hospital, University of South China, Hengyang, Hunan, China
- Key Laboratory of Cancer Cellular and Molecular Pathology of Hunan Provincial University, Cancer Research Institute, University of South China, Hengyang, Hunan, China
| | - Yujuan Zhou
- Key Laboratory of Translational Radiation Oncology, Hunan Province, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Zhibing Pan
- Department of Gastroenterology, The First Affiliated Hospital, University of South China, Hengyang, Hunan, China
| | - Ling Shi
- Key Laboratory of Cancer Cellular and Molecular Pathology of Hunan Provincial University, Cancer Research Institute, University of South China, Hengyang, Hunan, China
| | - Jing Yang
- Key Laboratory of Cancer Cellular and Molecular Pathology of Hunan Provincial University, Cancer Research Institute, University of South China, Hengyang, Hunan, China
| | - Aijun Liao
- Department of Gastroenterology, The First Affiliated Hospital, University of South China, Hengyang, Hunan, China
| | - Qianjin Liao
- Key Laboratory of Translational Radiation Oncology, Hunan Province, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Qi Su
- Key Laboratory of Cancer Cellular and Molecular Pathology of Hunan Provincial University, Cancer Research Institute, University of South China, Hengyang, Hunan, China
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28
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Kugathasan P, Waller J, Westrich L, Abdourahman A, Tamm JA, Pehrson AL, Dale E, Gulinello M, Sanchez C, Li Y. In vivo and in vitro effects of vortioxetine on molecules associated with neuroplasticity. J Psychopharmacol 2017; 31:365-376. [PMID: 27678087 DOI: 10.1177/0269881116667710] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Neuroplasticity is fundamental for brain functions, abnormal changes of which are associated with mood disorders and cognitive impairment. Neuroplasticity can be affected by neuroactive medications and by aging. Vortioxetine, a multimodal antidepressant, has shown positive effects on cognitive functions in both pre-clinical and clinical studies. In rodent studies, vortioxetine increases glutamate neurotransmission, promotes dendritic branching and spine maturation, and elevates hippocampal expression of the activity-regulated cytoskeleton-associated protein (Arc/Arg3.1) at the transcript level. The present study aims to assess the effects of vortioxetine on several neuroplasticity-related molecules in different experimental systems. Chronic (1 month) vortioxetine increased Arc/Arg3.1 protein levels in the cortical synaptosomes of young and middle-aged mice. In young mice, this was accompanied by an increase in actin-depolymerizing factor (ADF)/cofilin serine 3 phosphorylation without altering the total ADF/cofilin protein level, and an increase in the GluA1 subunit of the α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor phosphorylation at serine 845 (S845) without altering serine 831 (S831) GluA1 phosphorylation nor the total GluA1 protein level. Similar effects were detected in cultured rat hippocampal neurons: Acute vortioxetine increased S845 GluA1 phosphorylation without changing S831 GluA1 phosphorylation or the total GluA1 protein level. These changes were accompanied by an increase in α subunit of Ca2+/calmodulin-dependent kinase (CaMKIIα) phosphorylation (at threonine 286) without changing the total CaMKIIα protein level in cultured neurons. In addition, chronic (1 month) vortioxetine, but not fluoxetine, restored the age-associated reduction in Arc/Arg3.1 and c-Fos transcripts in the frontal cortex of middle-aged mice. Taken together, these results demonstrated that vortioxetine modulates molecular targets that are related to neuroplasticity.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Yan Li
- 1 Lundbeck Research, Paramus, NJ, USA
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29
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The tired hippocampus: the molecular impact of sleep deprivation on hippocampal function. Curr Opin Neurobiol 2017; 44:13-19. [PMID: 28242433 DOI: 10.1016/j.conb.2017.02.005] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Accepted: 02/05/2017] [Indexed: 01/05/2023]
Abstract
Memory consolidation, the process by which information is stored following training, consists of synaptic consolidation and systems consolidation. It is widely acknowledged that sleep deprivation has a profound effect on synaptic consolidation, particularly for memories that require the hippocampus. It is unclear, however, which of the many molecular changes associated with sleep deprivation directly contribute to memory deficits. In this review, we highlight recent studies showing that sleep deprivation impairs hippocampal cAMP and mTOR signaling, and ultimately causes spine loss in CA1 neurons in a cofilin-dependent fashion. Reversing these molecular alterations made memory consolidation resistant to the negative impact of sleep deprivation. Together, these studies have started to identify the molecular underpinnings by which sleep deprivation impairs synaptic consolidation.
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30
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Cross-talk between LRRK2 and PKA: implication for Parkinson's disease? Biochem Soc Trans 2017; 45:261-267. [DOI: 10.1042/bst20160396] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 12/12/2016] [Accepted: 12/19/2016] [Indexed: 01/16/2023]
Abstract
Evidence indicates that leucine-rich repeat kinase 2 (LRRK2) controls multiple processes in neurons and glia cells. Deregulated LRRK2 activity due to gene mutation represents the most common cause of autosomal dominant Parkinson's disease (PD). Protein kinase A (PKA)-mediated signaling is a key regulator of brain function. PKA-dependent pathways play an important role in brain homeostasis, neuronal development, synaptic plasticity, control of microglia activation and inflammation. On the other hand, a decline of PKA signaling was shown to contribute to the progression of several neurodegenerative diseases, including PD. In this review, we will discuss the accumulating evidence linking PKA and LRRK2 in neuron and microglia functions, and offer an overview of the enigmatic cross-talk between these two kinases with molecular and cellular implications.
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31
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Lee HJ, Diaz MF, Price KM, Ozuna JA, Zhang S, Sevick-Muraca EM, Hagan JP, Wenzel PL. Fluid shear stress activates YAP1 to promote cancer cell motility. Nat Commun 2017; 8:14122. [PMID: 28098159 PMCID: PMC5253685 DOI: 10.1038/ncomms14122] [Citation(s) in RCA: 164] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2016] [Accepted: 11/04/2016] [Indexed: 12/28/2022] Open
Abstract
Mechanical stress is pervasive in egress routes of malignancy, yet the intrinsic effects of force on tumour cells remain poorly understood. Here, we demonstrate that frictional force characteristic of flow in the lymphatics stimulates YAP1 to drive cancer cell migration; whereas intensities of fluid wall shear stress (WSS) typical of venous or arterial flow inhibit taxis. YAP1, but not TAZ, is strictly required for WSS-enhanced cell movement, as blockade of YAP1, TEAD1-4 or the YAP1–TEAD interaction reduces cellular velocity to levels observed without flow. Silencing of TEAD phenocopies loss of YAP1, implicating transcriptional transactivation function in mediating force-enhanced cell migration. WSS dictates expression of a network of YAP1 effectors with executive roles in invasion, chemotaxis and adhesion downstream of the ROCK–LIMK–cofilin signalling axis. Altogether, these data implicate YAP1 as a fluid mechanosensor that functions to regulate genes that promote metastasis. Fluid frictional forces around cancer cells influence chemokine production and delivery of chemotherapeutic drugs but it is unclear if they directly impact tumour biology through biomechanical effects. Here, the authors show that wall shear stress stimulates cancer cell migration through a ROCK–LIMK–YAP axis.
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Affiliation(s)
- Hyun Jung Lee
- Children's Regenerative Medicine Program, Department of Pediatric Surgery, University of Texas Health Science Center at Houston, Houston, Texas 77030, USA.,Center for Stem Cell and Regenerative Medicine, The Brown Foundation Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, Texas 77030, USA
| | - Miguel F Diaz
- Children's Regenerative Medicine Program, Department of Pediatric Surgery, University of Texas Health Science Center at Houston, Houston, Texas 77030, USA.,Center for Stem Cell and Regenerative Medicine, The Brown Foundation Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, Texas 77030, USA
| | - Katherine M Price
- Department of BioSciences, Rice University, Houston, Texas 77030, USA
| | - Joyce A Ozuna
- Department of BioSciences, Rice University, Houston, Texas 77030, USA
| | - Songlin Zhang
- Department of Pathology, The University of Texas Medical School, Houston, Texas 77030, USA
| | - Eva M Sevick-Muraca
- Center for Molecular Imaging, The Brown Foundation Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, Texas 77030, USA
| | - John P Hagan
- Vivian L. Smith Department of Neurosurgery, University of Texas Health Science Center at Houston, Houston, Texas 77030, USA
| | - Pamela L Wenzel
- Children's Regenerative Medicine Program, Department of Pediatric Surgery, University of Texas Health Science Center at Houston, Houston, Texas 77030, USA.,Center for Stem Cell and Regenerative Medicine, The Brown Foundation Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, Texas 77030, USA
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32
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Niu X, Pi SL, Baral S, Xia YP, He QW, Li YN, Jin HJ, Li M, Wang MD, Mao L, Hu B. P2Y 12 Promotes Migration of Vascular Smooth Muscle Cells Through Cofilin Dephosphorylation During Atherogenesis. Arterioscler Thromb Vasc Biol 2017; 37:515-524. [PMID: 28062501 DOI: 10.1161/atvbaha.116.308725] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Accepted: 12/26/2016] [Indexed: 02/01/2023]
Abstract
OBJECTIVE P2Y12 is a well-recognized receptor expressed on platelets and the target of thienopyridine-type antiplatelet drugs. However, recent evidence suggests that P2Y12 expressed in vessel wall plays a role in atherogenesis, but the mechanisms remain elusive. In this study, we examined the molecular mechanisms of how vessel wall P2Y12 mediates vascular smooth muscle cells (VSMCs) migration and promotes the progression of atherosclerosis. APPROACH AND RESULTS Using a high-fat diet-fed apolipoprotein E-deficient mice model, we found that the expression of P2Y12 in VSMCs increased in a time-dependent manner and had a linear relationship with the plaque area. Moreover, administration of P2Y12 receptor antagonist for 12 weeks caused significant reduction in atheroma and decreased the abundance of VSMCs in plaque. In cultured VSMCs, we found that activation of P2Y12 receptor inhibited cAMP/protein kinase A signaling pathway, which induced cofilin dephosphorylation and filamentous actin disassembly, thereby enhancing VSMCs motility and migration. In addition, the number of P2Y12-positive VSMCs was decreased in the carotid artery plaque from patients receiving clopidogrel. CONCLUSIONS Vessel wall P2Y12 receptor, which promotes VSMCs migration through cofilin dephosphorylation, plays a critical role in the development of atherosclerotic lesion and may be used as a therapeutic target for atherosclerosis.
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Affiliation(s)
- Xuan Niu
- From the Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Shu-Lan Pi
- From the Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Suraj Baral
- From the Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yuan-Peng Xia
- From the Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Quan-Wei He
- From the Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ya-Nan Li
- From the Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hui-Juan Jin
- From the Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Man Li
- From the Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Meng-Die Wang
- From the Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ling Mao
- From the Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
| | - Bo Hu
- From the Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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33
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Kim TH, Gill NK, Nyberg KD, Nguyen AV, Hohlbauch SV, Geisse NA, Nowell CJ, Sloan EK, Rowat AC. Cancer cells become less deformable and more invasive with activation of β-adrenergic signaling. J Cell Sci 2016; 129:4563-4575. [PMID: 27875276 DOI: 10.1242/jcs.194803] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 11/06/2016] [Indexed: 12/22/2022] Open
Abstract
Invasion by cancer cells is a crucial step in metastasis. An oversimplified view in the literature is that cancer cells become more deformable as they become more invasive. β-adrenergic receptor (βAR) signaling drives invasion and metastasis, but the effects on cell deformability are not known. Here, we show that activation of β-adrenergic signaling by βAR agonists reduces the deformability of highly metastatic human breast cancer cells, and that these stiffer cells are more invasive in vitro We find that βAR activation also reduces the deformability of ovarian, prostate, melanoma and leukemia cells. Mechanistically, we show that βAR-mediated cell stiffening depends on the actin cytoskeleton and myosin II activity. These changes in cell deformability can be prevented by pharmacological β-blockade or genetic knockout of the β2-adrenergic receptor. Our results identify a β2-adrenergic-Ca2+-actin axis as a new regulator of cell deformability, and suggest that the relationship between cell mechanical properties and invasion might be dependent on context.
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Affiliation(s)
- Tae-Hyung Kim
- Department of Integrative Biology and Physiology, University of California, Los Angeles 90095, USA.,Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles 90095, USA
| | - Navjot Kaur Gill
- Department of Integrative Biology and Physiology, University of California, Los Angeles 90095, USA
| | - Kendra D Nyberg
- Department of Integrative Biology and Physiology, University of California, Los Angeles 90095, USA.,Department of Bioengineering, University of California, Los Angeles 90095, USA
| | - Angelyn V Nguyen
- Department of Integrative Biology and Physiology, University of California, Los Angeles 90095, USA
| | - Sophia V Hohlbauch
- Asylum Research, an Oxford Instruments Company, Santa Barbara, CA 93117, USA
| | - Nicholas A Geisse
- Asylum Research, an Oxford Instruments Company, Santa Barbara, CA 93117, USA
| | - Cameron J Nowell
- Drug Discovery Biology Theme, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
| | - Erica K Sloan
- Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles 90095, USA.,Drug Discovery Biology Theme, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia.,Division of Cancer Surgery, Peter MacCallum Cancer Centre, Melbourne, Victoria 3000, Australia.,UCLA Jonsson Comprehensive Cancer Center, University of California, Los Angeles 90095, USA.,UCLA AIDS Institute, University of California, Los Angeles 90095, USA
| | - Amy C Rowat
- Department of Integrative Biology and Physiology, University of California, Los Angeles 90095, USA .,Department of Bioengineering, University of California, Los Angeles 90095, USA.,UCLA Jonsson Comprehensive Cancer Center, University of California, Los Angeles 90095, USA
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34
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Havekes R, Park AJ, Tudor JC, Luczak VG, Hansen RT, Ferri SL, Bruinenberg VM, Poplawski SG, Day JP, Aton SJ, Radwańska K, Meerlo P, Houslay MD, Baillie GS, Abel T. Sleep deprivation causes memory deficits by negatively impacting neuronal connectivity in hippocampal area CA1. eLife 2016; 5. [PMID: 27549340 PMCID: PMC4996653 DOI: 10.7554/elife.13424] [Citation(s) in RCA: 171] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 07/29/2016] [Indexed: 12/18/2022] Open
Abstract
Brief periods of sleep loss have long-lasting consequences such as impaired memory consolidation. Structural changes in synaptic connectivity have been proposed as a substrate of memory storage. Here, we examine the impact of brief periods of sleep deprivation on dendritic structure. In mice, we find that five hours of sleep deprivation decreases dendritic spine numbers selectively in hippocampal area CA1 and increased activity of the filamentous actin severing protein cofilin. Recovery sleep normalizes these structural alterations. Suppression of cofilin function prevents spine loss, deficits in hippocampal synaptic plasticity, and impairments in long-term memory caused by sleep deprivation. The elevated cofilin activity is caused by cAMP-degrading phosphodiesterase-4A5 (PDE4A5), which hampers cAMP-PKA-LIMK signaling. Attenuating PDE4A5 function prevents changes in cAMP-PKA-LIMK-cofilin signaling and cognitive deficits associated with sleep deprivation. Our work demonstrates the necessity of an intact cAMP-PDE4-PKA-LIMK-cofilin activation-signaling pathway for sleep deprivation-induced memory disruption and reduction in hippocampal spine density. DOI:http://dx.doi.org/10.7554/eLife.13424.001 The demands of modern society means that millions of people do not get sufficient sleep on a daily basis. Sleep deprivation, even if only for brief periods, can impair learning and memory. In many cases, this impairment appears to be related to changes in the activity of a brain region called the hippocampus. However, the exact processes responsible for producing the effects of sleep deprivation remain unclear. During learning or forming a new memory, the connections between the relevant neurons in the brain change. Havekes et al. found that depriving mice of sleep for just five hours dramatically reduced the connectivity between neurons in the hippocampus. This reduction is caused by the increased activity of cofilin, a protein that breaks down the actin filaments that shape the connections between neurons. Havekes et al. then used a virus to introduce an inactive version of cofilin into hippocampal neurons to suppress the activity of the naturally present cofilin. This manipulation prevented both the loss of the connections between neurons and the memory deficits normally associated with sleep deprivation. Havekes et al. also found that recovery sleep leads to the re-wiring of neurons in the hippocampus. Future studies are now needed to determine how the neurons are able to re-wire themselves during recovery sleep. DOI:http://dx.doi.org/10.7554/eLife.13424.002
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Affiliation(s)
- Robbert Havekes
- Department of Biology, University of Pennsylvania, Philadelphia, United States.,Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, Groningen, The Netherlands
| | - Alan J Park
- Department of Biology, University of Pennsylvania, Philadelphia, United States
| | - Jennifer C Tudor
- Department of Biology, University of Pennsylvania, Philadelphia, United States
| | - Vincent G Luczak
- Department of Biology, University of Pennsylvania, Philadelphia, United States
| | - Rolf T Hansen
- Department of Biology, University of Pennsylvania, Philadelphia, United States
| | - Sarah L Ferri
- Department of Biology, University of Pennsylvania, Philadelphia, United States
| | - Vibeke M Bruinenberg
- Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, Groningen, The Netherlands
| | - Shane G Poplawski
- Department of Biology, University of Pennsylvania, Philadelphia, United States
| | - Jonathan P Day
- Institute of Cardiovascular and Medical Science, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Sara J Aton
- LSA Molecular, Cellular, and Developmental Biology, University of Michigan-Ann Arbor, Ann Arbor, United States
| | - Kasia Radwańska
- Laboratory of Molecular Basis of Behavior, Head Nencki Institute of Experimental Biology, Warsaw, Poland
| | - Peter Meerlo
- Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, Groningen, The Netherlands
| | - Miles D Houslay
- Institute of Pharmaceutical Science, King's College London, London, United Kingdom
| | - George S Baillie
- Institute of Cardiovascular and Medical Science, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Ted Abel
- Department of Biology, University of Pennsylvania, Philadelphia, United States
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35
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Sigloch FC, Burk UC, Biniossek ML, Brabletz T, Schilling O. miR-200c dampens cancer cell migration via regulation of protein kinase A subunits. Oncotarget 2016. [PMID: 26203557 PMCID: PMC4695158 DOI: 10.18632/oncotarget.4381] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Expression of miR-200c is a molecular switch to determine cellular fate towards a mesenchymal or epithelial phenotype. miR-200c suppresses the early steps of tumor progression by preventing epithelial-mesenchymal transition (EMT) and intravasation of tumor cells. Unraveling the underlying molecular mechanisms might pinpoint to novel therapeutic options. To better understand these mechanisms it is crucial to identify targets of miR-200c. Here, we employ a combination of quantitative proteomic and bioinformatic strategies to identify novel miR-200c targets. We identify and confirm two subunits of the central cellular kinase protein kinase A (PKA), namely PRKAR1A and PRKACB, to be directly regulated by miR-200c. Notably, siRNA-mediated downregulation of both proteins phenocopies the migratory behavior of breast cancer cells after miR-200c overexpression. Patient data from publicly accessible databases supports a miR-200c-PKA axis. Thus, our study identifies the PKA heteroprotein as an important mediator of miR-200c induced repression of migration in breast cancer cells. By bioinformatics, we define a miRNA target cluster consisting of PRKAR1A, PRKAR2B, PRKACB, and COF2, which is targeted by a group of 14 miRNAs.
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Affiliation(s)
- Florian Christoph Sigloch
- Institute of Molecular Medicine and Cell Research, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Ulrike Christina Burk
- Institute of Molecular Medicine and Cell Research, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,BIOSS Centre for Biological Signaling Studies, University of Freiburg, Freiburg, Germany
| | - Martin Lothar Biniossek
- Institute of Molecular Medicine and Cell Research, Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Thomas Brabletz
- Experimental Medicine I, Nikolaus-Fiebiger-Center for Molecular Medicine, University Erlangen-Nürnberg, Erlangen, Germany
| | - Oliver Schilling
- Institute of Molecular Medicine and Cell Research, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,BIOSS Centre for Biological Signaling Studies, University of Freiburg, Freiburg, Germany.,German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Heidelberg, Germany
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Pollock LM, Chou SW, McDermott BM. My oh my(osin): Insights into how auditory hair cells count, measure, and shape. J Cell Biol 2016; 212:135-7. [PMID: 26754648 PMCID: PMC4721532 DOI: 10.1083/jcb.201512086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 12/30/2015] [Indexed: 11/22/2022] Open
Abstract
The mechanisms underlying mechanosensory hair bundle formation in auditory sensory cells are largely mysterious. In this issue, Lelli et al. (2016. J. Cell Biol.http://dx.doi.org/10.1083/jcb.201509017) reveal that a pair of molecular motors, myosin IIIa and myosin IIIb, is involved in the hair bundle’s morphology and hearing.
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Affiliation(s)
- Lana M Pollock
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, Case Western Reserve University, Cleveland, OH 44106 Department of Genetics and Genome Sciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106
| | - Shih-Wei Chou
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, Case Western Reserve University, Cleveland, OH 44106 Department of Biology, Case Western Reserve University, Cleveland, OH 44106
| | - Brian M McDermott
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, Case Western Reserve University, Cleveland, OH 44106 Department of Biology, Case Western Reserve University, Cleveland, OH 44106 Department of Genetics and Genome Sciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106 Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106
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Cui J, Ding M, Deng W, Yin Y, Wang Z, Zhou H, Sun G, Jiang Y, Feng Y. Discovery of bis-aryl urea derivatives as potent and selective Limk inhibitors: Exploring Limk1 activity and Limk1/ROCK2 selectivity through a combined computational study. Bioorg Med Chem 2015; 23:7464-77. [DOI: 10.1016/j.bmc.2015.10.041] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 10/28/2015] [Accepted: 10/29/2015] [Indexed: 01/14/2023]
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38
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Blirando K, Blaise R, Gorodnaya N, Rouxel C, Meilhac O, Vincent P, Limon I. The stellate vascular smooth muscle cell phenotype is induced by IL-1β via the secretion of PGE2 and subsequent cAMP-dependent protein kinase A activation. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1853:3235-47. [PMID: 26403276 DOI: 10.1016/j.bbamcr.2015.09.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 09/11/2015] [Accepted: 09/14/2015] [Indexed: 12/12/2022]
Abstract
Atherosclerosis development is associated with morphological changes to intimal cells, leading to a stellate cell phenotype. In this study, we aimed to determine whether and how key pro-atherogenic cytokines present in atherosclerotic plaques (IL-1β, TNFα and IFNγ) could induce this phenotype, as these molecules are known to trigger the transdifferentiation of vascular smooth muscle cells (VSMCs). We found that, IL-1β was the only major inflammatory mediator tested capable of inducing a stellate morphology in VSMCs. This finding was confirmed by staining for F-actin and vinculin at focal adhesions, as these two markers were disrupted only by IL-1β. We then investigated the possible association of this IL-1β-dependent change in morphology with an increase in intracellular cAMP concentration ([cAMP]), using the FRET-based biosensor for cAMP (T)Epac(VV). Experiments in the presence of IL-1β or medium conditioned by IL-1β-treated VSMCs and pharmacological tools demonstrated that the long-term increase in intracellular cAMP concentration was induced by the secretion of an autocrine/paracrine mediator, prostaglandin E₂(PGE₂), acting through the EP4 receptor. Finally, by knocking down the expression of the regulatory subunit PKAR1α, thereby reproducing the effects of IL-1β and PGE₂ on VSMCs, we demonstrated the contribution of PKA activity to the observed behavior of VSMCs.
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Affiliation(s)
- Karl Blirando
- Sorbonne Universités, UPMC Univ Paris 06CNRS UMR 8256 B2A, IBPS, F-75005, Paris, France
| | - Régis Blaise
- Sorbonne Universités, UPMC Univ Paris 06CNRS UMR 8256 B2A, IBPS, F-75005, Paris, France
| | - Natalia Gorodnaya
- Sorbonne Universités, UPMC Univ Paris 06CNRS UMR 8256 B2A, IBPS, F-75005, Paris, France
| | - Clotilde Rouxel
- Sorbonne Universités, UPMC Univ Paris 06CNRS UMR 8256 B2A, IBPS, F-75005, Paris, France
| | - Olivier Meilhac
- Inserm U1188 Diabète Athérothrombose Thérapies Réunion Océan Indien (DéTROI) CYROI, 2, rue Maxime Rivière, 97490 Sainte Clotilde, La Réunion, France
| | - Pierre Vincent
- Sorbonne Universités, UPMC Univ Paris 06CNRS UMR 8256 B2A, IBPS, F-75005, Paris, France
| | - Isabelle Limon
- Sorbonne Universités, UPMC Univ Paris 06CNRS UMR 8256 B2A, IBPS, F-75005, Paris, France.
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39
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The role and importance of cofilin in human sperm capacitation and the acrosome reaction. Cell Tissue Res 2015; 362:665-75. [DOI: 10.1007/s00441-015-2229-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 05/20/2015] [Indexed: 10/23/2022]
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40
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Different patterns of electrical activity lead to long-term potentiation by activating different intracellular pathways. J Neurosci 2015; 35:621-33. [PMID: 25589756 DOI: 10.1523/jneurosci.2193-14.2015] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Deciphering and storing information coded in different firing patterns are important properties of neuronal networks, as they allow organisms to respond and adapt to external and internal events. Here we report that hippocampal CA1 pyramidal neurons respond to brief bursts of high-frequency stimulation (HFS) and θ burst stimulation (TBS) with long-lasting enhanced responses (long-term potentiation [LTP]), albeit by engaging different signaling pathways. TBS induces LTP through calpain-1-mediated suprachiasmatic nucleus circadian oscillatory protein degradation, ERK activation, and actin polymerization, whereas HFS requires adenosine A2 receptors, PKA, and actin polymerization. TBS- but not HFS-induced LTP is impaired in calpain-1 knock-out mice. However, TBS-induced LTP and learning impairment in knock-out mice are restored by activating the HFS pathway. Thus, different patterns of rhythmic activities trigger potentiation by activating different pathways, and cross talks between these can be used to restore LTP and learning when elements of the pathways are impaired.
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41
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Cancino J, Capalbo A, Di Campli A, Giannotta M, Rizzo R, Jung JE, Di Martino R, Persico M, Heinklein P, Sallese M, Luini A. Control systems of membrane transport at the interface between the endoplasmic reticulum and the Golgi. Dev Cell 2014; 30:280-94. [PMID: 25117681 DOI: 10.1016/j.devcel.2014.06.018] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 04/08/2014] [Accepted: 06/23/2014] [Indexed: 10/24/2022]
Abstract
A fundamental property of cellular processes is to maintain homeostasis despite varying internal and external conditions. Within the membrane transport apparatus, variations in membrane fluxes from the endoplasmic reticulum (ER) to the Golgi complex are balanced by opposite fluxes from the Golgi to the ER to maintain homeostasis between the two organelles. Here we describe a molecular device that balances transport fluxes by integrating transduction cascades with the transport machinery. Specifically, ER-to-Golgi transport activates the KDEL receptor at the Golgi, which triggers a cascade that involves Gs and adenylyl cyclase and phosphodiesterase isoforms and then PKA activation and results in the phosphorylation of transport machinery proteins. This induces retrograde traffic to the ER and balances transport fluxes between the ER and Golgi. Moreover, the KDEL receptor activates CREB1 and other transcription factors that upregulate transport-related genes. Thus, a Golgi-based control system maintains transport homeostasis through both signaling and transcriptional networks.
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Affiliation(s)
- Jorge Cancino
- Istituto di Biochimica delle Proteine, Consiglio Nazionale delle Ricerche, Via Pietro Castellino 111, 80131 Napoli, Italy; Telethon Institute of Genetics and Medicine, Via Pietro Castellino 111, 80131 Napoli, Italy; Departamento de Ciencias Biológicas, Facultad de Ciencias Biológicas, Universidad Andrés Bello, Quillota 980, Viña del Mar 2520000, Chile.
| | - Anita Capalbo
- Istituto di Biochimica delle Proteine, Consiglio Nazionale delle Ricerche, Via Pietro Castellino 111, 80131 Napoli, Italy; Telethon Institute of Genetics and Medicine, Via Pietro Castellino 111, 80131 Napoli, Italy
| | - Antonella Di Campli
- Istituto di Biochimica delle Proteine, Consiglio Nazionale delle Ricerche, Via Pietro Castellino 111, 80131 Napoli, Italy
| | - Monica Giannotta
- Consorzio Mario Negri Sud, Via Nazionale 8/A, 66030 Santa Maria Imbaro (Chieti), Italy
| | - Riccardo Rizzo
- Istituto di Biochimica delle Proteine, Consiglio Nazionale delle Ricerche, Via Pietro Castellino 111, 80131 Napoli, Italy; Telethon Institute of Genetics and Medicine, Via Pietro Castellino 111, 80131 Napoli, Italy
| | - Juan E Jung
- Istituto di Biochimica delle Proteine, Consiglio Nazionale delle Ricerche, Via Pietro Castellino 111, 80131 Napoli, Italy; Istituto di Ricovero e Cura a Carattere Scientifico, Istituto di Ricerca Diagnostica e Nucleare (SDN), 80143 Napoli, Italy
| | - Rosaria Di Martino
- Istituto di Biochimica delle Proteine, Consiglio Nazionale delle Ricerche, Via Pietro Castellino 111, 80131 Napoli, Italy
| | - Maria Persico
- Istituto di Biochimica delle Proteine, Consiglio Nazionale delle Ricerche, Via Pietro Castellino 111, 80131 Napoli, Italy; Istituto di Ricovero e Cura a Carattere Scientifico, Istituto di Ricerca Diagnostica e Nucleare (SDN), 80143 Napoli, Italy
| | - Petra Heinklein
- Institut für Biochemie Charité, Universitätsmedizin Berlin, CrossOver Charitéplatz 1/Sitz, Virchowweg 6, 10117 Berlin, Germany
| | - Michele Sallese
- Consorzio Mario Negri Sud, Via Nazionale 8/A, 66030 Santa Maria Imbaro (Chieti), Italy
| | - Alberto Luini
- Istituto di Biochimica delle Proteine, Consiglio Nazionale delle Ricerche, Via Pietro Castellino 111, 80131 Napoli, Italy; Telethon Institute of Genetics and Medicine, Via Pietro Castellino 111, 80131 Napoli, Italy.
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Ht31 peptide inhibited inflammatory pain by blocking NMDA receptor-mediated nociceptive transmission in spinal dorsal horn of mice. Neuropharmacology 2014; 89:290-7. [PMID: 25312281 DOI: 10.1016/j.neuropharm.2014.09.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 09/10/2014] [Accepted: 09/30/2014] [Indexed: 12/27/2022]
Abstract
A kinase anchoring proteins (AKAPs) assemble cAMP-dependent protein kinase (PKA) into signaling complexes with a wide range of ion channels, including N-methyl-d-aspartate (NMDA)-subtype glutamate receptor (NMDAR) that is critical for the central sensitization of nociceptive behaviors. Although PKA has been widely described in the regulation of NMDAR-dependent nociceptive transmission and plasticity, the roles of AKAPs in these processes are largely unknown as yet. The present study interfered with AKAPs/PKA interaction by introducing stearated Ht31 peptide (St-Ht31) into spinal dorsal horn neurons, and investigated the possible changes of primary afferent-evoked, NMDAR-mediated excitatory postsynaptic currents (NMDAR-EPSCs). Whole-cell patch clamp recordings demonstrated that intracellular loading of St-Ht31 through the glass pipettes didn't affect NMDAR-mediated synaptic responses in the spinal cord slices from intact mice. When inflammatory pain was established by intraplantar injection of Complete Freund's Adjuvant (CFA), however, St-Ht31 significantly repressed the amplitudes of NMDAR-EPSCs by selectively removing GluN2B subunit-containing NMDAR out of synapses. With the inhibition of NMDAR-mediated nociceptive transmission, St-Ht31 effectively ameliorated CFA-induced inflammatory pain. Pharmacological manipulation of microtubule-based NMDAR transport, dynamin-dependent NMDAR endocytosis or actin depolymerization abolished the inhibitory effects of St-Ht31 peptide on NMDAR-EPSCs, suggesting that disruption of AKAPs/PKA interaction by St-Ht31 might disturb multiple NMDAR trafficking steps to reduce the receptor synaptic expression and spinal sensitization.
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43
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Eisa-Beygi S, Macdonald RL, Wen XY. Regulatory pathways affecting vascular stabilization via VE-cadherin dynamics: insights from zebrafish (Danio rerio). J Cereb Blood Flow Metab 2014; 34:1430-3. [PMID: 25027310 PMCID: PMC4158677 DOI: 10.1038/jcbfm.2014.128] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Revised: 05/31/2014] [Accepted: 06/23/2014] [Indexed: 12/22/2022]
Abstract
The endothelial-specific transmembrane glycoprotein, vascular endothelial (VE)-cadherin, is required for the organization of a stable vascular endothelium. A number of cerebrovascular disorders are associated with mutations in genes that otherwise regulate vascular integrity through VE-cadherin dynamics. Hence, identification and characterization of regulatory pathways contributing to endothelial cell-cell adhesion is of clinical relevance, particularly in the treatment of aneurysms and cerebral cavernous malformations. The zebrafish (Danio rerio) have recently emerged as a powerful paradigm for studies geared toward elucidating the etiology of cerebrovascular disorders, principally in uncovering the genetic and mechanistic basis controlling endothelial adhesive barrier function.
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Affiliation(s)
- Shahram Eisa-Beygi
- 1] Zebrafish Centre for Advanced Drug Discovery, Keenan Research Centre of the Li Ka Shing Knowledge Institute, St Michael's Hospital, Toronto, Ontario, Canada [2] Institute of Medical Science, Departments of Medicine and Surgery, University of Toronto, Toronto, Ontario, Canada
| | - R Loch Macdonald
- 1] Zebrafish Centre for Advanced Drug Discovery, Keenan Research Centre of the Li Ka Shing Knowledge Institute, St Michael's Hospital, Toronto, Ontario, Canada [2] Institute of Medical Science, Departments of Medicine and Surgery, University of Toronto, Toronto, Ontario, Canada [3] Division of Neurosurgery, St Michael's Hospital, Keenan Research Centre for Biomedical Science and the Li Ka Shing Knowledge Institute of St Michael's Hospital, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Xiao-Yan Wen
- 1] Zebrafish Centre for Advanced Drug Discovery, Keenan Research Centre of the Li Ka Shing Knowledge Institute, St Michael's Hospital, Toronto, Ontario, Canada [2] Institute of Medical Science, Departments of Medicine and Surgery, University of Toronto, Toronto, Ontario, Canada
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44
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Matsuda S, Kominato K, Koide-Yoshida S, Miyamoto K, Isshiki K, Tsuji A, Yuasa K. PCTAIRE kinase 3/cyclin-dependent kinase 18 is activated through association with cyclin A and/or phosphorylation by protein kinase A. J Biol Chem 2014; 289:18387-400. [PMID: 24831015 DOI: 10.1074/jbc.m113.542936] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
PCTAIRE kinase 3 (PCTK3)/cyclin-dependent kinase 18 (CDK18) is an uncharacterized member of the CDK family because its activator(s) remains unidentified. Here we describe the mechanisms of catalytic activation of PCTK3 by cyclin A2 and cAMP-dependent protein kinase (PKA). Using a pulldown experiment with HEK293T cells, cyclin A2 and cyclin E1 were identified as proteins that interacted with PCTK3. An in vitro kinase assay using retinoblastoma protein as the substrate showed that PCTK3 was specifically activated by cyclin A2 but not by cyclin E1, although its activity was lower than that of CDK2. Furthermore, immunocytochemistry analysis showed that PCTK3 colocalized with cyclin A2 in the cytoplasm and regulated cyclin A2 stability. Amino acid sequence analysis revealed that PCTK3 contained four putative PKA phosphorylation sites. In vitro and in vivo kinase assays showed that PCTK3 was phosphorylated by PKA at Ser(12), Ser(66), and Ser(109) and that PCTK3 activity significantly increased via phosphorylation at Ser(12) by PKA even in the absence of cyclin A2. In the presence of cyclin A2, PCTK3 activity was comparable to CDK2 activity. We also found that PCTK3 knockdown in HEK293T cells induced polymerized actin accumulation in peripheral areas and cofilin phosphorylation. Taken together, our results provide the first evidence for the mechanisms of catalytic activation of PCTK3 by cyclin A2 and PKA and a physiological function of PCTK3.
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Affiliation(s)
- Shinya Matsuda
- From the Department of Biological Science and Technology, The University of Tokushima Graduate School, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
| | - Kyohei Kominato
- From the Department of Biological Science and Technology, The University of Tokushima Graduate School, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
| | - Shizuyo Koide-Yoshida
- From the Department of Biological Science and Technology, The University of Tokushima Graduate School, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
| | - Kenji Miyamoto
- From the Department of Biological Science and Technology, The University of Tokushima Graduate School, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
| | - Kinuka Isshiki
- From the Department of Biological Science and Technology, The University of Tokushima Graduate School, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
| | - Akihiko Tsuji
- From the Department of Biological Science and Technology, The University of Tokushima Graduate School, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
| | - Keizo Yuasa
- From the Department of Biological Science and Technology, The University of Tokushima Graduate School, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
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45
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Shen M, Zhou S, Li Y, Li D, Hou T. Theoretical study on the interaction of pyrrolopyrimidine derivatives as LIMK2 inhibitors: insight into structure-based inhibitor design. MOLECULAR BIOSYSTEMS 2014; 9:2435-46. [PMID: 23881296 DOI: 10.1039/c3mb70168a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
LIM kinases (LIMKs), downstream of Rho-associated protein kinases (ROCKs) and p21-activated protein kinases (PAKs), are shown to be promising targets for the treatment of cancers. In this study, the inhibition mechanism of 41 pyrrolopyrimidine derivatives as LIMK2 inhibitors was explored through a series of theoretical approaches. First, a model of LIMK2 was generated through molecular homology modeling, and the studied inhibitors were docked into the binding active site of LIMK2 by the docking protocol, taking into consideration the flexibility of the protein. The binding poses predicted by molecular docking for 17 selected inhibitors with different bioactivities complexed with LIMK2 underwent molecular dynamics (MD) simulations, and the binding free energies for the complexes were predicted by using the molecular mechanics/generalized born surface area (MM/GBSA) method. The predicted binding free energies correlated well with the experimental bioactivities (r(2) = 0.63 or 0.62). Next, the free energy decomposition analysis was utilized to highlight the following key structural features related to biological activity: (1) the important H-bond between Ile408 and pyrrolopyrimidine, (2) the H-bonds between the inhibitors and Asp469 and Gly471 which maintain the stability of the DFG-out conformation, and (3) the hydrophobic interactions between the inhibitors and several key residues (Leu337, Phe342, Ala345, Val358, Lys360, Leu389, Ile408, Leu458 and Leu472). Finally, a variety of LIMK2 inhibitors with a pyrrolopyrimidine scaffold were designed, some of which showed improved potency according to the predictions. Our studies suggest that the use of molecular docking with MD simulations and free energy calculations could be a powerful tool for understanding the binding mechanism of LIMK2 inhibitors and for the design of more potent LIMK2 inhibitors.
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Affiliation(s)
- Mingyun Shen
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, China.
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Pierozan P, Ferreira F, Ortiz de Lima B, Gonçalves Fernandes C, Totarelli Monteforte P, de Castro Medaglia N, Bincoletto C, Soubhi Smaili S, Pessoa-Pureur R. The phosphorylation status and cytoskeletal remodeling of striatal astrocytes treated with quinolinic acid. Exp Cell Res 2014; 322:313-23. [PMID: 24583400 DOI: 10.1016/j.yexcr.2014.02.024] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 01/10/2014] [Accepted: 02/19/2014] [Indexed: 12/24/2022]
Abstract
Quinolinic acid (QUIN) is a glutamate agonist which markedly enhances the vulnerability of neural cells to excitotoxicity. QUIN is produced from the amino acid tryptophan through the kynurenine pathway (KP). Dysregulation of this pathway is associated with neurodegenerative conditions. In this study we treated striatal astrocytes in culture with QUIN and assayed the endogenous phosphorylating system associated with glial fibrillary acidic protein (GFAP) and vimentin as well as cytoskeletal remodeling. After 24h incubation with 100 µM QUIN, cells were exposed to (32)P-orthophosphate and/or protein kinase A (PKA), protein kinase dependent of Ca(2+)/calmodulin II (PKCaMII) or protein kinase C (PKC) inhibitors, H89 (20 μM), KN93 (10 μM) and staurosporin (10nM), respectively. Results showed that hyperphosphorylation was abrogated by PKA and PKC inhibitors but not by the PKCaMII inhibitor. The specific antagonists to ionotropic NMDA and non-NMDA (50 µM DL-AP5 and CNQX, respectively) glutamate receptors as well as to metabotropic glutamate receptor (mGLUR; 50 µM MCPG), mGLUR1 (100 µM MPEP) and mGLUR5 (10 µM 4C3HPG) prevented the hyperphosphorylation provoked by QUIN. Also, intra and extracellular Ca(2+) quelators (1mM EGTA; 10 µM BAPTA-AM, respectively) prevented QUIN-mediated effect, while Ca(2+) influx through voltage-dependent Ca(2+) channel type L (L-VDCC) (blocker: 10 µM verapamil) is not implicated in this effect. Morphological analysis showed dramatically altered actin cytoskeleton with concomitant change of morphology to fusiform and/or flattened cells with retracted cytoplasm and disruption of the GFAP meshwork, supporting misregulation of actin cytoskeleton. Both hyperphosphorylation and cytoskeletal remodeling were reversed 24h after QUIN removal. Astrocytes are highly plastic cells and the vulnerability of astrocyte cytoskeleton may have important implications for understanding the neurotoxicity of QUIN in neurodegenerative disorders.
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Affiliation(s)
- Paula Pierozan
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - Fernanda Ferreira
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - Bárbara Ortiz de Lima
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - Carolina Gonçalves Fernandes
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | | | | | - Claudia Bincoletto
- Departamento de Farmacologia, Universidade Federal de São Paulo (UNIFESP/EPM), São Paulo, SP, Brazil
| | - Soraya Soubhi Smaili
- Departamento de Farmacologia, Universidade Federal de São Paulo (UNIFESP/EPM), São Paulo, SP, Brazil
| | - Regina Pessoa-Pureur
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil.
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47
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LRRK2 regulates synaptogenesis and dopamine receptor activation through modulation of PKA activity. Nat Neurosci 2014; 17:367-76. [PMID: 24464040 DOI: 10.1038/nn.3636] [Citation(s) in RCA: 147] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Accepted: 12/24/2013] [Indexed: 11/08/2022]
Abstract
Leucine-rich repeat kinase 2 (LRRK2) is enriched in the striatal projection neurons (SPNs). We found that LRRK2 negatively regulates protein kinase A (PKA) activity in the SPNs during synaptogenesis and in response to dopamine receptor Drd1 activation. LRRK2 interacted with PKA regulatory subunit IIβ (PKARIIβ). A lack of LRRK2 promoted the synaptic translocation of PKA and increased PKA-mediated phosphorylation of actin-disassembling enzyme cofilin and glutamate receptor GluR1, resulting in abnormal synaptogenesis and transmission in the developing SPNs. Furthermore, PKA-dependent phosphorylation of GluR1 was also aberrantly enhanced in the striatum of young and aged Lrrk2(-/-) mice after treatment with a Drd1 agonist. Notably, a Parkinson's disease-related Lrrk2 R1441C missense mutation that impaired the interaction of LRRK2 with PKARIIβ also induced excessive PKA activity in the SPNs. Our findings reveal a previously unknown regulatory role for LRRK2 in PKA signaling and suggest a pathogenic mechanism of SPN dysfunction in Parkinson's disease.
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48
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Rodnight RB, Gottfried C. Morphological plasticity of rodent astroglia. J Neurochem 2012; 124:263-75. [PMID: 23278277 DOI: 10.1111/jnc.12087] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Revised: 11/04/2012] [Accepted: 11/04/2012] [Indexed: 11/29/2022]
Abstract
In the past two decades, there has been an explosion of research on the role of neuroglial interactions in the control of brain homeostasis in both physiological and pathological conditions. Astrocytes, a subtype of glia in the central nervous system, are dynamic signaling elements that regulate neurogenesis and development of brain circuits, displaying intimate dynamic relationships with neurons, especially at synaptic sites where they functionally integrate the tripartite synapse. When astrocytes are isolated from the brain and maintained in culture, they exhibit a polygonal shape unlike their precursors in vivo. However, cultured astrocytes can be induced to undergo morphological plasticity leading to process formation, either by interaction with neurons or by the influence of pharmacological agents. This review highlights studies on the molecular mechanisms underlying morphological plasticity in astrocyte cultures and intact brain tissue, both in situ and in vivo.
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Affiliation(s)
- Richard Burnard Rodnight
- School of Biomedical Sciences and Pharmacy and Hunter Medical Research Institute, The University of Newcastle, Callaghan, Australia
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49
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Zhou Y, Su J, Shi L, Liao Q, Su Q. DADS downregulates the Rac1-ROCK1/PAK1-LIMK1-ADF/cofilin signaling pathway, inhibiting cell migration and invasion. Oncol Rep 2012; 29:605-12. [PMID: 23233092 DOI: 10.3892/or.2012.2168] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2012] [Accepted: 11/09/2012] [Indexed: 11/06/2022] Open
Abstract
The aim of this study was to explore the molecular mechanisms of the diallyl disulfide (DADS)-mediated downregulation of LIM kinase-1 (LIMK1) and the consequent inhibition of the migration and invasion of human colorectal cancer cells. RNA interference technology was used to establish stable LIMK1-miRNA/SW480 cell lines. The effects of DADS and LIMK1 RNA interference on the migration and invasion of SW480 cells were observed by scratch wound healing assay and Transwell migration assay. The effects of DADS on signaling molecules of the Rac1-Rho kinase (ROCK)1/p21-activated kinase (PAK)1-LIM kinase (LIMK)1-actin depolymerizing factor (ADF)/cofilin pathway in SW480 cells were examined by RT-PCR and western blot analysis. The healing and migration rate of the SW480 cells was significantly reduced and the cell penetrating ability was significantly suppressed (P<0.05) following treatment with DADS (45 mg/l). The immunohistochemistry and western blot analysis results showed that DADS significantly downregulated LIMK1 protein expression and suppressed LIMK1 protein phosphorylation. Furthermore, the RT-PCR and western blot analysis results revealed that DADS suppressed Rac1, ROCK1, PAK1, LIMK1 and destrin mRNA and protein expression, as well as the protein phosphorylation of LIMK1 and cofilin 1. The data demonstrate that LIMK1 expression positively correlates with the SW480 cell migration and invasion ability. DADS downregulates the Rac1-ROCK1/PAK1-LIMK1-ADF/cofilin signaling pathway, suppressing SW480 cell migration and invasion.
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Affiliation(s)
- Yujuan Zhou
- Key Laboratory of Cancer Cellular and Molecular Pathology of Hunan Provincial University, Cancer Research Institute, University of South China, Hengyang, Hunan 421001, PR China
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Saneyoshi T, Hayashi Y. The Ca2+ and Rho GTPase signaling pathways underlying activity-dependent actin remodeling at dendritic spines. Cytoskeleton (Hoboken) 2012; 69:545-54. [PMID: 22566410 DOI: 10.1002/cm.21037] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Revised: 04/17/2012] [Accepted: 04/25/2012] [Indexed: 02/06/2023]
Abstract
Most excitatory synapses reside on small protrusions located on the dendritic shaft of neurons called dendritic spines. Neuronal activity regulates the number and structure of spines in both developing and mature brains. Such morphological changes are mediated by the modification of the actin cytoskeleton, the major structural component of spines. Because the number and size of spines is tightly correlated with the strength of synaptic transmission, the activity-dependent structural remodeling of a spine plays an important role in the modulation of synaptic transmission. The regulation of spine morphogenesis utilizes multiple intracellular signaling pathways that alter the dynamics of actin remodeling. Here, we will review recent studies examining the signaling pathways underlying activity-dependent actin remodeling at excitatory postsynaptic neurons.
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