1
|
Duarte VN, Lam VT, Rimicci DS, Thompson-Peer KL. Calcium plays an essential role in early-stage dendrite injury detection and regeneration. Prog Neurobiol 2024; 239:102635. [PMID: 38825174 DOI: 10.1016/j.pneurobio.2024.102635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 05/21/2024] [Accepted: 05/30/2024] [Indexed: 06/04/2024]
Abstract
Dendrites are injured in a variety of clinical conditions such as traumatic brain and spinal cord injuries and stroke. How neurons detect injury directly to their dendrites to initiate a pro-regenerative response has not yet been thoroughly investigated. Calcium plays a critical role in the early stages of axonal injury detection and is also indispensable for regeneration of the severed axon. Here, we report cell and neurite type-specific differences in laser injury-induced elevations of intracellular calcium levels. Using a human KCNJ2 transgene, we demonstrate that hyperpolarizing neurons only at the time of injury dampens dendrite regeneration, suggesting that inhibition of injury-induced membrane depolarization (and thus early calcium influx) plays a role in detecting and responding to dendrite injury. In exploring potential downstream calcium-regulated effectors, we identify L-type voltage-gated calcium channels, inositol triphosphate signaling, and protein kinase D activity as drivers of dendrite regeneration. In conclusion, we demonstrate that dendrite injury-induced calcium elevations play a key role in the regenerative response of dendrites and begin to delineate the molecular mechanisms governing dendrite repair.
Collapse
Affiliation(s)
- Vinicius N Duarte
- Dept of Developmental and Cell Biology, University of California, Irvine, United States
| | - Vicky T Lam
- Dept of Developmental and Cell Biology, University of California, Irvine, United States
| | - Dario S Rimicci
- Dept of Developmental and Cell Biology, University of California, Irvine, United States
| | - Katherine L Thompson-Peer
- Dept of Developmental and Cell Biology, University of California, Irvine, United States; Center for the Neurobiology of Learning and Memory, Irvine, CA, United States; Sue and Bill Gross Stem Cell Research Center, Irvine, CA, United States; Reeve-Irvine Research Center, Irvine, CA, United States.
| |
Collapse
|
2
|
Clites BL, Frohock B, Koury EJ, Andersen EC, Pierce JT. Natural variation in protein kinase D modifies alcohol sensitivity in Caenorhabditis elegans. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.06.09.598102. [PMID: 38895441 PMCID: PMC11185769 DOI: 10.1101/2024.06.09.598102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/21/2024]
Abstract
Differences in naïve alcohol sensitivity between individuals are a strong predictor of later life alcohol use disorders (AUD). However, the genetic bases for alcohol sensitivity (beyond ethanol metabolism) and pharmacological approaches to modulate alcohol sensitivity remain poorly understood. We used a high-throughput behavioral screen to measure acute behavioral sensitivity to alcohol, a model of intoxication, in a genetically diverse set of over 150 wild strains of the nematode Caenorhabditis elegans. We performed a genome-wide association study to identify loci that underlie natural variation in alcohol sensitivity. We identified five quantitative trait loci (QTL) and further show that variants in the C. elegans ortholog of protein kinase D, dkf-2, likely underlie the chromosome V QTL. We found that resistance to intoxication was conferred by dkf-2 loss-of-function mutations as well as partly by a PKD inhibitor in a dkf-2-dependent manner. Protein kinase D might represent a conserved, druggable target to modify alcohol sensitivity with application towards AUD.
Collapse
Affiliation(s)
- Benjamin L Clites
- Waggoner Center for Alcohol & Addiction Research, Center for Learning and Memory, Department of Neuroscience, University of Texas at Austin, Austin TX
| | - Brooke Frohock
- Waggoner Center for Alcohol & Addiction Research, Center for Learning and Memory, Department of Neuroscience, University of Texas at Austin, Austin TX
| | - Emily J Koury
- Department of Biology, Johns Hopkins University, Baltimore MD
| | - Erik C Andersen
- Department of Biology, Johns Hopkins University, Baltimore MD
| | - Jonathan T Pierce
- Waggoner Center for Alcohol & Addiction Research, Center for Learning and Memory, Department of Neuroscience, University of Texas at Austin, Austin TX
| |
Collapse
|
3
|
Hu M, Bodnar B, Zhang Y, Xie F, Li F, Li S, Zhao J, Zhao R, Gedupoori N, Mo Y, Lin L, Li X, Meng W, Yang X, Wang H, Barbe MF, Srinivasan S, Bethea JR, Mo X, Xu H, Hu W. Defective neurite elongation and branching in Nibp/Trappc9 deficient zebrafish and mice. Int J Biol Sci 2023; 19:3226-3248. [PMID: 37416774 PMCID: PMC10321293 DOI: 10.7150/ijbs.78489] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 06/06/2023] [Indexed: 07/08/2023] Open
Abstract
Loss of function in transport protein particles (TRAPP) links a new set of emerging genetic disorders called "TRAPPopathies". One such disorder is NIBP syndrome, characterized by microcephaly and intellectual disability, and caused by mutations of NIBP/TRAPPC9, a crucial and unique member of TRAPPII. To investigate the neural cellular/molecular mechanisms underlying microcephaly, we developed Nibp/Trappc9-deficient animal models using different techniques, including morpholino knockdown and CRISPR/Cas mutation in zebrafish and Cre/LoxP-mediated gene targeting in mice. Nibp/Trappc9 deficiency impaired the stability of the TRAPPII complex at actin filaments and microtubules of neurites and growth cones. This deficiency also impaired elongation and branching of neuronal dendrites and axons, without significant effects on neurite initiation or neural cell number/types in embryonic and adult brains. The positive correlation of TRAPPII stability and neurite elongation/branching suggests a potential role for TRAPPII in regulating neurite morphology. These results provide novel genetic/molecular evidence to define patients with a type of non-syndromic autosomal recessive intellectual disability and highlight the importance of developing therapeutic approaches targeting the TRAPPII complex to cure TRAPPopathies.
Collapse
Affiliation(s)
- Min Hu
- Laboratory of Stem Cell Biology, State Key Laboratory of Biotherapy, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China
| | - Brittany Bodnar
- Center for Metabolic Disease Research, Department of Pathalogy and Laboratory Medicine, Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA
| | - Yonggang Zhang
- Center for Stem Cell Research and Application, Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Chengdu 610052, China
| | - Fangxin Xie
- Center for Stem Cell Research and Application, Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Chengdu 610052, China
- Department of Clinical Laboratory, Xi'an NO. 3 Hospital, Xi'an, Shaanxi, 710018, China
| | - Fang Li
- Center for Metabolic Disease Research, Department of Pathalogy and Laboratory Medicine, Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA
| | - Siying Li
- Laboratory of Stem Cell Biology, State Key Laboratory of Biotherapy, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China
| | - Jin Zhao
- Laboratory of Stem Cell Biology, State Key Laboratory of Biotherapy, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China
| | - Ruotong Zhao
- Center for Metabolic Disease Research, Department of Pathalogy and Laboratory Medicine, Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA
| | - Naveen Gedupoori
- Center for Metabolic Disease Research, Department of Pathalogy and Laboratory Medicine, Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA
| | - Yifan Mo
- Center for Metabolic Disease Research, Department of Pathalogy and Laboratory Medicine, Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA
| | - Lanyi Lin
- Center for Metabolic Disease Research, Department of Pathalogy and Laboratory Medicine, Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA
| | - Xue Li
- Laboratory of Stem Cell Biology, State Key Laboratory of Biotherapy, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China
| | - Wentong Meng
- Laboratory of Stem Cell Biology, State Key Laboratory of Biotherapy, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China
| | - Xiaofeng Yang
- Center for Metabolic Disease Research, Department of Pathalogy and Laboratory Medicine, Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA
| | - Hong Wang
- Center for Metabolic Disease Research, Department of Pathalogy and Laboratory Medicine, Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA
| | - Mary F. Barbe
- Center for Metabolic Disease Research, Department of Pathalogy and Laboratory Medicine, Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA
| | - Shanthi Srinivasan
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - John R. Bethea
- Department of Biology, Drexel University, Philadelphia, PA, USA
| | - Xianming Mo
- Laboratory of Stem Cell Biology, State Key Laboratory of Biotherapy, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China
| | - Hong Xu
- Laboratory of Stem Cell Biology, State Key Laboratory of Biotherapy, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China
| | - Wenhui Hu
- Laboratory of Stem Cell Biology, State Key Laboratory of Biotherapy, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China
- Center for Metabolic Disease Research, Department of Pathalogy and Laboratory Medicine, Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA
| |
Collapse
|
4
|
Li C, Huang S, Peng J, Hong T, Zhou C, Tang J. 14-3-3ζ Mediates GABA AR Activation by Interacting with BIG1. Mol Neurobiol 2023; 60:1721-1732. [PMID: 36562883 DOI: 10.1007/s12035-022-03172-z] [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: 07/28/2022] [Accepted: 12/10/2022] [Indexed: 12/24/2022]
Abstract
Most fast synaptic inhibitions in the mammalian brain are mediated by GABAA receptors (GABAARs). An appropriate level of GABAAR expression at the cell surface is essential for neurodevelopment and the efficacy of GABAergic synaptic transmission. We previously reported that brefeldin A-inhibited GDP/GTP exchange factor 1 (BIG1), a binding partner of GABAARs, plays an important role in trafficking GABAARs to the cell surface. However, its regulatory mechanisms remain unknown. In the present study, we identified a new cellular protein, 14-3-3ζ, which can interact with the β subunit of GABAARs and BIG1 both in vitro and in vivo and colocalizes in the soma, dendrites, and axons of hippocampal neurons. Overexpression of 14-3-3ζ-WT increased the surface expression of BIG1 in dendrites and axons, as well as the binding of BIG1 with GABAAR. Depleted 14-3-3ζ with efficacious siRNA attenuated the interaction between BIG1 and GABAARs and resulted in significant decreases in the surface expression levels of BIG1 and GABAAR. GABAAR agonist treatment increased the expression levels of BIG1 and 14-3-3ζ on the surface, indicating that 14-3-3ζ is involved in regulating BIG1-mediated GABAAR surface expression. Depletion of BIG1 or 14-3-3ζ significantly decreased GABAAR expression at the cell surface and suppressed the GABA-gated influx of chloride ions. These data indicate that the combination of 14-3-3ζ and BIG1 is required for GABAAR membrane expression. Our results provide a potential promising therapeutic target for neurological disorders involving GABAergic synaptic transmission.
Collapse
Affiliation(s)
- Cuixian Li
- Experiment Teaching & Administration Center, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Shen Huang
- Experiment Teaching & Administration Center, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Jin Peng
- Laboratory of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510515, China
| | - Tianguo Hong
- Experiment Teaching & Administration Center, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Chun Zhou
- Laboratory of Immunopharmacology, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China.
- SMU-KI United Medical Inflammatory Center, School of Pharmaceutical Sciences; Guangdong Provincial Key Laboratory of Shock and Microcirculation, Southern Medical University, Guangzhou, 510515, China.
| | - Jie Tang
- Key Laboratory of Mental Health of the Ministry of Education, Southern Medical University, Guangzhou, 510515, China.
- Department of Physiology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China.
- Department of Otolaryngology Head & Neck Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, China.
| |
Collapse
|
5
|
Wang F, Yin XS, Lu J, Cen C, Wang Y. Phosphorylation-dependent positive feedback on the oxytocin receptor through the kinase PKD1 contributes to long-term social memory. Sci Signal 2022; 15:eabd0033. [PMID: 35104164 DOI: 10.1126/scisignal.abd0033] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Social memory enables one to recognize and distinguish specific individuals. It is fundamental to social behaviors that can be mediated by the oxytocin receptor (OXTR), such as forming relationships. We investigated the molecular regulation and function of OXTR in animal behavior involving social memory. We found that Ser261 in OXTR was phosphorylated by protein kinase D1 (PKD1). Neuronal Ca2+ signaling and behavior analyses revealed that rats expressing a mutated form of OXTR that cannot be phosphorylated at this residue (OXTR S261A) in the medial amygdala (MeA) exhibited impaired long-term social memory (LTSM). Blocking the phosphorylation of wild-type OXTR in the MeA using an interfering peptide in rats or through conditional knockout of Pkd1 in mice reduced social memory retention, whereas expression of a phosphomimetic mutant of OXTR rescued it. In HEK293A cells, the PKD1-mediated phosphorylation of OXTR promoted its binding to Gq protein and, in turn, OXTR-mediated phosphorylation of PKD1, indicating a positive feedback loop. In addition, OXTR with a single-nucleotide polymorphism found in humans (rs200362197), which has a mutation in the conserved recognition region in the PKD1 phosphorylation site, showed impaired activation and signaling in vitro and in HEK293A cells similar to that of the S216A mutant. Our findings describe a phosphoregulatory loop for OXTR and its critical role in social behavior that might be further explored in associated disorders.
Collapse
Affiliation(s)
- Fei Wang
- Department of Neurobiology, School of Basic Medical Sciences and Neuroscience Research Institute; Key Lab for Neuroscience, Ministry of Education of China and National Health Commission and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100083, China.,Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - Xiang-Sha Yin
- Department of Neurobiology, School of Basic Medical Sciences and Neuroscience Research Institute; Key Lab for Neuroscience, Ministry of Education of China and National Health Commission and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100083, China
| | - Jie Lu
- Department of Neurobiology, School of Basic Medical Sciences and Neuroscience Research Institute; Key Lab for Neuroscience, Ministry of Education of China and National Health Commission and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100083, China
| | - Cheng Cen
- Department of Neurobiology, School of Basic Medical Sciences and Neuroscience Research Institute; Key Lab for Neuroscience, Ministry of Education of China and National Health Commission and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100083, China
| | - Yun Wang
- Department of Neurobiology, School of Basic Medical Sciences and Neuroscience Research Institute; Key Lab for Neuroscience, Ministry of Education of China and National Health Commission and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100083, China.,PKU-IDG/McGovern Institute for Brain Research, Peking University, Beijing 100871, China
| |
Collapse
|
6
|
Oueslati Morales CO, Ignácz A, Bencsik N, Sziber Z, Rátkai AE, Lieb WS, Eisler SA, Szűcs A, Schlett K, Hausser A. Protein kinase D promotes activity-dependent AMPA receptor endocytosis in hippocampal neurons. Traffic 2021; 22:454-470. [PMID: 34564930 DOI: 10.1111/tra.12819] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 08/12/2021] [Accepted: 09/14/2021] [Indexed: 12/18/2022]
Abstract
α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) type glutamate receptors (AMPARs) mediate the majority of fast excitatory neurotransmission in the brain. The continuous trafficking of AMPARs into and out of synapses is a core feature of synaptic plasticity, which is considered as the cellular basis of learning and memory. The molecular mechanisms underlying the postsynaptic AMPAR trafficking, however, are still not fully understood. In this work, we demonstrate that the protein kinase D (PKD) family promotes basal and activity-induced AMPAR endocytosis in primary hippocampal neurons. Pharmacological inhibition of PKD increased synaptic levels of GluA1-containing AMPARs, slowed down their endocytic trafficking and increased neuronal network activity. By contrast, ectopic expression of constitutive active PKD decreased the synaptic level of AMPARs, while increasing their colocalization with early endosomes. Our results thus establish an important role for PKD in the regulation of postsynaptic AMPAR trafficking during synaptic plasticity.
Collapse
Affiliation(s)
- Carlos O Oueslati Morales
- Membrane Trafficking and Signalling Group, Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Attila Ignácz
- Neuronal Cell Biology Group, Department of Physiology and Neurobiology, Eötvös Loránd University, Budapest, Hungary
| | - Norbert Bencsik
- Neuronal Cell Biology Group, Department of Physiology and Neurobiology, Eötvös Loránd University, Budapest, Hungary
| | - Zsofia Sziber
- Neuronal Cell Biology Group, Department of Physiology and Neurobiology, Eötvös Loránd University, Budapest, Hungary
| | - Anikó Erika Rátkai
- Neuronal Cell Biology Group, Department of Physiology and Neurobiology, Eötvös Loránd University, Budapest, Hungary
| | - Wolfgang S Lieb
- Membrane Trafficking and Signalling Group, Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Stephan A Eisler
- Stuttgart Research Center Systems Biology, University of Stuttgart, Stuttgart, Germany
| | - Attila Szűcs
- Neuronal Cell Biology Group, Department of Physiology and Neurobiology, Eötvös Loránd University, Budapest, Hungary
| | - Katalin Schlett
- Neuronal Cell Biology Group, Department of Physiology and Neurobiology, Eötvös Loránd University, Budapest, Hungary
| | - Angelika Hausser
- Membrane Trafficking and Signalling Group, Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany.,Stuttgart Research Center Systems Biology, University of Stuttgart, Stuttgart, Germany
| |
Collapse
|
7
|
Homeostatic plasticity and burst activity are mediated by hyperpolarization-activated cation currents and T-type calcium channels in neuronal cultures. Sci Rep 2021; 11:3236. [PMID: 33547341 PMCID: PMC7864958 DOI: 10.1038/s41598-021-82775-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 01/20/2021] [Indexed: 01/27/2023] Open
Abstract
Homeostatic plasticity stabilizes neuronal networks by adjusting the responsiveness of neurons according to their global activity and the intensity of the synaptic inputs. We investigated the homeostatic regulation of hyperpolarization-activated cyclic nucleotide-gated (HCN) and T-type calcium (CaV3) channels in dissociated and organotypic slice cultures. After 48 h blocking of neuronal activity by tetrodotoxin (TTX), our patch-clamp experiments revealed an increase in the depolarizing voltage sag and post-inhibitory rebound mediated by HCN and CaV3 channels, respectively. All HCN subunits (HCN1 to 4) and T-type Ca-channel subunits (CaV3.1, 3.2 and 3.3) were expressed in both control and activity-deprived hippocampal cultures. Elevated expression levels of CaV3.1 mRNA and a selective increase in the expression of TRIP8b exon 4 isoforms, known to regulate HCN channel localization, were also detected in TTX-treated cultured hippocampal neurons. Immunohistochemical staining in TTX-treated organotypic slices verified a more proximal translocation of HCN1 channels in CA1 pyramidal neurons. Computational modeling also implied that HCN and T-type calcium channels have important role in the regulation of synchronized bursting evoked by previous activity-deprivation. Thus, our findings indicate that HCN and T-type Ca-channels contribute to the homeostatic regulation of excitability and integrative properties of hippocampal neurons.
Collapse
|
8
|
De Jong KA, Hall LG, Renton MC, Connor T, Martin SD, Kowalski GM, Shaw CS, Bruce CR, Howlett KF, McGee SL. Loss of protein kinase D activity demonstrates redundancy in cardiac glucose metabolism and preserves cardiac function in obesity. Mol Metab 2020; 42:101105. [PMID: 33099046 PMCID: PMC7680779 DOI: 10.1016/j.molmet.2020.101105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 10/18/2020] [Accepted: 10/20/2020] [Indexed: 12/17/2022] Open
Abstract
Objective Protein kinase D (PKD) signaling has been implicated in stress-induced cardiac remodeling and function as well as metabolic processes including contraction-mediated cardiac glucose uptake. PKD has recently emerged as a nutrient-sensing kinase that is activated in high-lipid environments, such as in obesity. However, the role of PKD signaling in cardiac glucose metabolism and cardiac function in both normal and obese conditions remains unknown. Methods A cardiac-specific and inducible dominant negative (DN) PKD mouse model was developed. Echocardiography was used to assess cardiac function, while metabolic phenotyping was performed, including stable isotope metabolomics on cardiac tissue in mice fed either regular chow or a high-fat diet (43% calories from fat). Results Cardiac PKD activity declined by ∼90% following DN PKD induction in adult mice. The mice had diminished basal cardiac glucose clearance, suggesting impaired contraction-mediated glucose uptake, but normal cardiac function. In obesity studies, systolic function indices were reduced in control mice, but not in cardiac DN PKD mice. Using targeted stable isotope metabolomic analyses, no differences in glucose flux through glycolysis or the TCA cycle were observed between groups. Conclusions The data show that PKD contributes to cardiac dysfunction in obesity and highlight the redundancy in cardiac glucose metabolism that maintains cardiac glucose flux in vivo. The data suggest that impairments in contraction-mediated glucose uptake are unlikely to drive cardiac dysfunction in both normal and metabolic disease states. Cardiac protein kinase D (PKD) is required for contraction-mediated glucose uptake. PKD is not essential for normal cardiac function. Loss of PKD activity does not alter cardiac glucose flux in normal or obese mice. Loss of cardiac PKD activity preserves cardiac function in obesity.
Collapse
Affiliation(s)
- Kirstie A De Jong
- Institute for Mental and Physical Health and Clinical Translation, Metabolic Research Unit, School of Medicine, Deakin University, Geelong, Australia; Institute of Experimental Cardiovascular Research, University Medical Center Hamburg-Eppendorf, Germany
| | - Liam G Hall
- Institute for Mental and Physical Health and Clinical Translation, Metabolic Research Unit, School of Medicine, Deakin University, Geelong, Australia
| | - Mark C Renton
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Science, Deakin University, Geelong, Australia
| | - Timothy Connor
- Institute for Mental and Physical Health and Clinical Translation, Metabolic Research Unit, School of Medicine, Deakin University, Geelong, Australia
| | - Sheree D Martin
- Institute for Mental and Physical Health and Clinical Translation, Metabolic Research Unit, School of Medicine, Deakin University, Geelong, Australia
| | - Greg M Kowalski
- Institute for Mental and Physical Health and Clinical Translation, Metabolic Research Unit, School of Medicine, Deakin University, Geelong, Australia; Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Science, Deakin University, Geelong, Australia
| | - Christopher S Shaw
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Science, Deakin University, Geelong, Australia
| | - Clinton R Bruce
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Science, Deakin University, Geelong, Australia
| | - Kirsten F Howlett
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Science, Deakin University, Geelong, Australia
| | - Sean L McGee
- Institute for Mental and Physical Health and Clinical Translation, Metabolic Research Unit, School of Medicine, Deakin University, Geelong, Australia.
| |
Collapse
|
9
|
Short-term neuronal effects of fumonisin B1 on neuronal activity in rodents. Neurotoxicology 2020; 80:41-51. [PMID: 32561249 DOI: 10.1016/j.neuro.2020.06.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 06/05/2020] [Accepted: 06/15/2020] [Indexed: 11/24/2022]
Abstract
Fumonisin B1 (FB1) is a mycotoxin produced by microscopic fungi (mostly Fusarium species), which may infect our major crops. The toxin inhibits the development of these plants and may also have harmful effects on animals and humans consuming the infected crops. FB1 inhibits sphingolipid biosynthesis which leads to altered membrane characteristics and consequently, altered cellular functions. There are some indications that the toxin has inhibitory effects on neuronal activity in case of repeated consumption, presumably due to sphingolipid depletion. However, according to new literature data, FB1 may have acute excitatory neural effects, too, via different mechanisms of action. Therefore, in the present study, we addressed the neuronal network effects of FB1 following acute treatment, using different electrophysiological techniques in vitro and in vivo. Acute treatments with FB1 (10-100 μM) were carried out on brain slices, tissue cultures and live animals. After direct treatment of samples, electrically evoked or spontaneous field potentials were examined in the hippocampus and the neocortex of rat brain slices and in hippocampal cell cultures. In the hippocampus, a short-term increase in the excitability of neuronal networks and individual cells was observed in response to FB1 treatment. In some cases, the initially enhanced excitation was reversed presumably due to overactivation of neuronal networks. Normal spontaneous activity was found to be stimulated in hippocampal cell cultures. Seizure susceptibility was not affected in the neocortex of brain slices. For the verification of the results caused by direct treatment, effects of systemic administration of FB1 (7.5 mg/kg, i.p.) were also examined. Evoked field potentials recorded in vivo from the somatosensory cortex and cell activation measured by the c-fos technique in hippocampus and somatosensory cortex were analyzed. However, the hippocampal and cortical stimulatory effect detected in vitro could not be demonstrated by these in vivo assays. Altogether, the toxin enhanced the basic excitability of neurons and neuronal networks after direct treatment but there were no effects on the given brain areas after systemic treatment in vivo. Based on the observed in vitro FB1 effects and the lack of data on the penetration of FB1 across the blood-brain barrier, we assume that in vivo consequences of FB1 administration can be more prominent in case of perturbed blood-brain barrier functions.
Collapse
|
10
|
Bencsik N, Pusztai S, Borbély S, Fekete A, Dülk M, Kis V, Pesti S, Vas V, Szűcs A, Buday L, Schlett K. Dendritic spine morphology and memory formation depend on postsynaptic Caskin proteins. Sci Rep 2019; 9:16843. [PMID: 31727973 PMCID: PMC6856520 DOI: 10.1038/s41598-019-53317-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 10/30/2019] [Indexed: 12/12/2022] Open
Abstract
CASK-interactive proteins, Caskin1 and Caskin2, are multidomain neuronal scaffold proteins. Recent data from Caskin1 knockout animals indicated only a mild role of Caskin1 in anxiety and pain perception. In this work, we show that deletion of both Caskins leads to severe deficits in novelty recognition and spatial memory. Ultrastructural analyses revealed a reduction in synaptic profiles and dendritic spine areas of CA1 hippocampal pyramidal neurons of double knockout mice. Loss of Caskin proteins impaired LTP induction in hippocampal slices, while miniature EPSCs in dissociated hippocampal cultures appeared to be unaffected. In cultured Caskin knockout hippocampal neurons, overexpressed Caskin1 was enriched in dendritic spine heads and increased the amount of mushroom-shaped dendritic spines. Chemically induced LTP (cLTP) mediated enlargement of spine heads was augmented in the knockout mice and was not influenced by Caskin1. Immunocytochemistry and immunoprecipitation confirmed that Shank2, a master scaffold of the postsynaptic density, and Caskin1 co-localized within the same complex. Phosphorylation of AMPA receptors was specifically altered by Caskin deficiency and was not elevated by cLTP treatment further. Taken together, our results prove a previously unnoticed postsynaptic role of Caskin scaffold proteins and indicate that Caskins influence learning abilities via regulating spine morphology and AMPA receptor localisation.
Collapse
Affiliation(s)
- Norbert Bencsik
- Department of Physiology and Neurobiology, Eötvös Loránd University, Budapest, Hungary
| | - Szilvia Pusztai
- Department of Physiology and Neurobiology, Eötvös Loránd University, Budapest, Hungary
| | - Sándor Borbély
- Department of Physiology and Neurobiology, Eötvös Loránd University, Budapest, Hungary.,Institute of Cognitive Neuroscience and Psychology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Anna Fekete
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Metta Dülk
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Viktor Kis
- Department Anatomy, Cell and Developmental Biology, Eötvös Loránd University, Budapest, Hungary
| | - Szabolcs Pesti
- Department Medical Chemistry, Semmelweis University, Budapest, Hungary
| | - Virág Vas
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Attila Szűcs
- Department of Physiology and Neurobiology, Eötvös Loránd University, Budapest, Hungary
| | - László Buday
- Institute of Enzymology, Research Centre of Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary.,Department Medical Chemistry, Semmelweis University, Budapest, Hungary
| | - Katalin Schlett
- Department of Physiology and Neurobiology, Eötvös Loránd University, Budapest, Hungary.
| |
Collapse
|
11
|
Liliom H, Lajer P, Bérces Z, Csernyus B, Szabó Á, Pinke D, Lőw P, Fekete Z, Pongrácz A, Schlett K. Comparing the effects of uncoated nanostructured surfaces on primary neurons and astrocytes. J Biomed Mater Res A 2019; 107:2350-2359. [PMID: 31161618 DOI: 10.1002/jbm.a.36743] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Revised: 05/27/2019] [Accepted: 05/30/2019] [Indexed: 12/15/2022]
Abstract
The long-term application of central nervous system implants is currently limited by the negative response of the brain tissue, affecting both the performance of the device and the survival of nearby cells. Topographical modification of implant surfaces mimicking the structure and dimensions of the extracellular matrix may provide a solution to this negative tissue response and has been shown to affect the attachment and behavior of both neurons and astrocytes. In our study, commonly used neural implant materials, silicon, and platinum were tested with or without nanoscale surface modifications. No biological coatings were used in order to only examine the effect of the nanostructuring. We seeded primary mouse astrocytes and hippocampal neurons onto four different surfaces: flat polysilicon, nanostructured polysilicon, and platinum-coated versions of these surfaces. Fluorescent wide-field, confocal, and scanning electron microscopy were used to characterize the attachment, spreading and proliferation of these cell types. In case of astrocytes, we found that both cell number and average cell spreading was significantly larger on platinum, compared to silicon surfaces, while silicon surfaces impeded glial proliferation. Nanostructuring did not have a significant effect on either parameter in astrocytes but influenced the orientation of actin filaments and glial fibrillary acidic protein fibers. Neuronal soma attachment was impaired on metal surfaces while nanostructuring seemed to influence neuronal growth cone morphology, regardless of surface material. Taken together, the type of metals tested had a profound influence on cellular responses, which was only slightly modified by nanopatterning.
Collapse
Affiliation(s)
- Hanna Liliom
- Neuronal Cell Biology Research Group, Department of Physiology and Neurobiology, Institute of Biology, Eötvös Loránd University, Budapest, Hungary
| | - Panna Lajer
- Neuronal Cell Biology Research Group, Department of Physiology and Neurobiology, Institute of Biology, Eötvös Loránd University, Budapest, Hungary
| | - Zsófia Bérces
- Faculty of Information Technology & Bionics, Pázmány Péter Catholic University, Budapest, Hungary.,Institute of Technical Physics and Materials Science, Centre for Energy Research, Hungarian Academy of Sciences, Budapest, Hungary
| | - Bence Csernyus
- Faculty of Information Technology & Bionics, Pázmány Péter Catholic University, Budapest, Hungary
| | - Ágnes Szabó
- Research Group for Implantable Microsystems, Faculty of Information Technology & Bionics, Pázmány Péter Catholic University, Budapest, Hungary
| | - Domonkos Pinke
- Lab. of 3D Functional Network and Dendritic Imaging, Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest, Hungary
| | - Péter Lőw
- Department of Anatomy, Cell and Developmental Biology, Institute of Biology, Eötvös Loránd University, Budapest, Hungary
| | - Zoltán Fekete
- Research Group for Implantable Microsystems, Faculty of Information Technology & Bionics, Pázmány Péter Catholic University, Budapest, Hungary
| | - Anita Pongrácz
- Institute of Technical Physics and Materials Science, Centre for Energy Research, Hungarian Academy of Sciences, Budapest, Hungary.,Research Group for Implantable Microsystems, Faculty of Information Technology & Bionics, Pázmány Péter Catholic University, Budapest, Hungary
| | - Katalin Schlett
- Neuronal Cell Biology Research Group, Department of Physiology and Neurobiology, Institute of Biology, Eötvös Loránd University, Budapest, Hungary
| |
Collapse
|
12
|
Gulyas M, Csiszer M, Mehes E, Czirok A. Software tools for cell culture-related 3D printed structures. PLoS One 2018; 13:e0203203. [PMID: 30180178 PMCID: PMC6122815 DOI: 10.1371/journal.pone.0203203] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Accepted: 08/16/2018] [Indexed: 02/05/2023] Open
Abstract
Three-dimensional (3D) printing technology allowed fast and cheap prototype fabrication in numerous segments of industry and it also became an increasingly versatile experimental platform in life sciences. Yet, general purpose software tools to control printer hardware are often suboptimal for bioprinting applications. Here we report a package of open source software tools that we developed specifically to meet bioprinting requirements: Machine movements can be (i) precisely specified using high level programming languages, and (ii) easily distributed across a batch of tissue culture dishes. To demonstrate the utility of the reported technique, we present custom fabricated, biocompatible 3D-printed plastic structures that can control cell spreading area or medium volume, and exhibit excellent optical properties even at 50 ul sample volumes. We expect our software tools to be helpful not only to manufacture customized in vitro experimental chambers, but for applications involving printing cells and extracellular matrices as well.
Collapse
Affiliation(s)
- Marton Gulyas
- Department of Biological Physics, Eotvos University, Budapest, Hungary
| | - Miklos Csiszer
- Department of Biological Physics, Eotvos University, Budapest, Hungary
| | - Elod Mehes
- Department of Biological Physics, Eotvos University, Budapest, Hungary
| | - Andras Czirok
- Department of Biological Physics, Eotvos University, Budapest, Hungary
- Department of Anatomy & Cell Biology, University of Kansas Medical Center, Kansas City, KS, United States of America
- * E-mail:
| |
Collapse
|
13
|
Microglia control the spread of neurotropic virus infection via P2Y12 signalling and recruit monocytes through P2Y12-independent mechanisms. Acta Neuropathol 2018; 136:461-482. [PMID: 30027450 PMCID: PMC6096730 DOI: 10.1007/s00401-018-1885-0] [Citation(s) in RCA: 91] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 06/11/2018] [Accepted: 07/05/2018] [Indexed: 12/22/2022]
Abstract
Neurotropic herpesviruses can establish lifelong infection in humans and contribute to severe diseases including encephalitis and neurodegeneration. However, the mechanisms through which the brain’s immune system recognizes and controls viral infections propagating across synaptically linked neuronal circuits have remained unclear. Using a well-established model of alphaherpesvirus infection that reaches the brain exclusively via retrograde transsynaptic spread from the periphery, and in vivo two-photon imaging combined with high resolution microscopy, we show that microglia are recruited to and isolate infected neurons within hours. Selective elimination of microglia results in a marked increase in the spread of infection and egress of viral particles into the brain parenchyma, which are associated with diverse neurological symptoms. Microglia recruitment and clearance of infected cells require cell-autonomous P2Y12 signalling in microglia, triggered by nucleotides released from affected neurons. In turn, we identify microglia as key contributors to monocyte recruitment into the inflamed brain, which process is largely independent of P2Y12. P2Y12-positive microglia are also recruited to infected neurons in the human brain during viral encephalitis and both microglial responses and leukocyte numbers correlate with the severity of infection. Thus, our data identify a key role for microglial P2Y12 in defence against neurotropic viruses, whilst P2Y12-independent actions of microglia may contribute to neuroinflammation by facilitating monocyte recruitment to the sites of infection.
Collapse
|
14
|
PKD1 Promotes Functional Synapse Formation Coordinated with N-Cadherin in Hippocampus. J Neurosci 2018; 38:183-199. [PMID: 29133434 DOI: 10.1523/jneurosci.1640-17.2017] [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: 06/13/2017] [Revised: 10/11/2017] [Accepted: 11/07/2017] [Indexed: 12/26/2022] Open
Abstract
Functional synapse formation is critical for the wiring of neural circuits in the developing brain. The cell adhesion molecule N-cadherin plays important roles in target recognition and synaptogenesis. However, the molecular mechanisms that regulate the localization of N-cadherin and the subsequent effects remain poorly understood. Here, we show that protein kinase D1 (PKD1) directly binds to N-cadherin at amino acid residues 836-871 and phosphorylates it at Ser 869, 871, and 872, thereby increasing the surface localization of N-cadherin and promoting functional synapse formation in primary cultured hippocampal neurons obtained from embryonic day 18 rat embryos of either sex. Intriguingly, neuronal activity enhances the interactions between N-cadherin and PKD1, which are critical for the activity-dependent growth of dendritic spines. Accordingly, either disruption the binding between N-cadherin and PKD1 or preventing the phosphorylation of N-cadherin by PKD1 in the hippocampal CA1 region of male rat leads to the reduction in synapse number and impairment of LTP. Together, this study demonstrates a novel mechanism of PKD1 regulating the surface localization of N-cadherin and suggests that the PKD1-N-cadherin interaction is critical for synapse formation and function.SIGNIFICANCE STATEMENT Defects in synapse formation and function lead to various neurological diseases, although the mechanisms underlying the regulation of synapse development are far from clear. Our results suggest that protein kinase D1 (PKD1) functions upstream of N-cadherin, a classical synaptic adhesion molecule, to promote functional synapse formation. Notably, we identified a crucial binding fragment to PKD1 at C terminus of N-cadherin, and this fragment also contains PKD1 phosphorylation sites. Through this interaction, PKD1 enhances the stability of N-cadherin on cell membrane and promotes synapse morphogenesis and synaptic plasticity in an activity-dependent manner. Our study reveals the role of PKD1 and the potential downstream mechanism in synapse development, and contributes to the research for neurodevelopment and the therapy for neurological diseases.
Collapse
|
15
|
Szűcs A, Rátkai A, Schlett K, Huerta R. Frequency-dependent regulation of intrinsic excitability by voltage-activated membrane conductances, computational modeling and dynamic clamp. Eur J Neurosci 2017; 46:2429-2444. [PMID: 28921695 DOI: 10.1111/ejn.13708] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 09/06/2017] [Accepted: 09/07/2017] [Indexed: 11/28/2022]
Abstract
As one of the most unique properties of nerve cells, their intrinsic excitability allows them to transform synaptic inputs into action potentials. This process reflects a complex interplay between the synaptic inputs and the voltage-dependent membrane currents of the postsynaptic neuron. While neurons in natural conditions mostly fire under the action of intense synaptic bombardment and receive fluctuating patterns of excitation and inhibition, conventional techniques to characterize intrinsic excitability mainly utilize static means of stimulation. Recently, we have shown that voltage-gated membrane currents regulate the firing responses under current step stimulation and under physiologically more realistic inputs in a differential manner. At the same time, a multitude of neuron types have been shown to exhibit some form of subthreshold resonance that potentially allows them to respond to synaptic inputs in a frequency-selective manner. In this study, we performed virtual experiments in computational models of neurons to examine how specific voltage-gated currents regulate their excitability under simulated frequency-modulated synaptic inputs. The model simulations and subsequent dynamic clamp experiments on mouse hippocampal pyramidal neurons revealed that the impact of voltage-gated currents in regulating the firing output is strongly frequency-dependent and mostly affecting the synaptic integration at theta frequencies. Notably, robust frequency-dependent regulation of intrinsic excitability was observed even when conventional analysis of membrane impedance suggested no such tendency. Consequently, plastic or homeostatic regulation of intrinsic membrane properties can tune the frequency selectivity of neuron populations in a way that is not readily expected from subthreshold impedance measurements.
Collapse
Affiliation(s)
- Attila Szűcs
- BioCircuits Institute, University of California San Diego, La Jolla, CA, USA.,MTA-ELTE-NAP B Neuronal Cell Biology Research Group, Eötvös Loránd University, 1/C Pázmány Péter Street, Budapest, H-1117, Hungary.,Balaton Limnological Institute of the Center for Ecological Research, Tihany, Hungary
| | - Anikó Rátkai
- MTA-ELTE-NAP B Neuronal Cell Biology Research Group, Eötvös Loránd University, 1/C Pázmány Péter Street, Budapest, H-1117, Hungary
| | - Katalin Schlett
- MTA-ELTE-NAP B Neuronal Cell Biology Research Group, Eötvös Loránd University, 1/C Pázmány Péter Street, Budapest, H-1117, Hungary
| | - Ramon Huerta
- BioCircuits Institute, University of California San Diego, La Jolla, CA, USA
| |
Collapse
|
16
|
Liliom H, Tárnok K, Ábrahám Z, Rácz B, Hausser A, Schlett K. Protein kinase D exerts neuroprotective functions during oxidative stress via nuclear factor kappa B-independent signaling pathways. J Neurochem 2017; 142:948-961. [DOI: 10.1111/jnc.14131] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 06/28/2017] [Accepted: 07/05/2017] [Indexed: 12/25/2022]
Affiliation(s)
- Hanna Liliom
- Department of Physiology and Neurobiology; Eötvös Loránd University; Budapest Hungary
| | - Krisztián Tárnok
- Department of Physiology and Neurobiology; Eötvös Loránd University; Budapest Hungary
| | - Zsófia Ábrahám
- Department of Physiology and Neurobiology; Eötvös Loránd University; Budapest Hungary
| | - Bence Rácz
- Department of Anatomy and Histology; University of Veterinary Medicine; Budapest Hungary
| | - Angelika Hausser
- Institute of Cell Biology and Immunology; University Stuttgart; Stuttgart Germany
- Stuttgart Research Center Systems Biology; University of Stuttgart; Stuttgart Germany
| | - Katalin Schlett
- Department of Physiology and Neurobiology; Eötvös Loránd University; Budapest Hungary
- MTA-ELTE-NAP B - Neuronal Cell Biology Research Group; Eötvös Loránd University; Budapest Hungary
| |
Collapse
|
17
|
Szíber Z, Liliom H, Morales COO, Ignácz A, Rátkai AE, Ellwanger K, Link G, Szűcs A, Hausser A, Schlett K. Ras and Rab interactor 1 controls neuronal plasticity by coordinating dendritic filopodial motility and AMPA receptor turnover. Mol Biol Cell 2017; 28:285-295. [PMID: 27852895 PMCID: PMC5231897 DOI: 10.1091/mbc.e16-07-0526] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 10/28/2016] [Accepted: 11/10/2016] [Indexed: 01/13/2023] Open
Abstract
Ras and Rab interactor 1 (RIN1) is predominantly expressed in the nervous system. RIN1-knockout animals have deficits in latent inhibition and fear extinction in the amygdala, suggesting a critical role for RIN1 in preventing the persistence of unpleasant memories. At the molecular level, RIN1 signals through Rab5 GTPases that control endocytosis of cell-surface receptors and Abl nonreceptor tyrosine kinases that participate in actin cytoskeleton remodeling. Here we report that RIN1 controls the plasticity of cultured mouse hippocampal neurons. Our results show that RIN1 affects the morphology of dendritic protrusions and accelerates dendritic filopodial motility through an Abl kinase-dependent pathway. Lack of RIN1 results in enhanced mEPSC amplitudes, indicating an increase in surface AMPA receptor levels compared with wild-type neurons. We further provide evidence that the Rab5 GEF activity of RIN1 regulates surface GluA1 subunit endocytosis. Consequently loss of RIN1 blocks surface AMPA receptor down-regulation evoked by chemically induced long-term depression. Our findings indicate that RIN1 destabilizes synaptic connections and is a key player in postsynaptic AMPA receptor endocytosis, providing multiple ways of negatively regulating memory stabilization during neuronal plasticity.
Collapse
Affiliation(s)
- Zsófia Szíber
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Hanna Liliom
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | | | - Attila Ignácz
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Anikó Erika Rátkai
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Kornelia Ellwanger
- Institute of Cell Biology and Immunology, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Gisela Link
- Institute of Cell Biology and Immunology, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Attila Szűcs
- MTA-ELTE-NAP B Neuronal Cell Biology Research Group, H-1117 Budapest, Hungary
| | - Angelika Hausser
- Institute of Cell Biology and Immunology, University of Stuttgart, D-70569 Stuttgart, Germany
- Stuttgart Research Center Systems Biology, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Katalin Schlett
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
- MTA-ELTE-NAP B Neuronal Cell Biology Research Group, H-1117 Budapest, Hungary
| |
Collapse
|
18
|
Bencsik N, Szíber Z, Liliom H, Tárnok K, Borbély S, Gulyás M, Rátkai A, Szűcs A, Hazai-Novák D, Ellwanger K, Rácz B, Pfizenmaier K, Hausser A, Schlett K. Protein kinase D promotes plasticity-induced F-actin stabilization in dendritic spines and regulates memory formation. J Cell Biol 2015; 210:771-83. [PMID: 26304723 PMCID: PMC4555815 DOI: 10.1083/jcb.201501114] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Accepted: 07/23/2015] [Indexed: 02/07/2023] Open
Abstract
PKD regulates the stabilization of the F-actin network within dendritic spines upon chemically induced plasticity changes and is needed for proper hippocampal LTP and spatial memory formation. Actin turnover in dendritic spines influences spine development, morphology, and plasticity, with functional consequences on learning and memory formation. In nonneuronal cells, protein kinase D (PKD) has an important role in stabilizing F-actin via multiple molecular pathways. Using in vitro models of neuronal plasticity, such as glycine-induced chemical long-term potentiation (LTP), known to evoke synaptic plasticity, or long-term depolarization block by KCl, leading to homeostatic morphological changes, we show that actin stabilization needed for the enlargement of dendritic spines is dependent on PKD activity. Consequently, impaired PKD functions attenuate activity-dependent changes in hippocampal dendritic spines, including LTP formation, cause morphological alterations in vivo, and have deleterious consequences on spatial memory formation. We thus provide compelling evidence that PKD controls synaptic plasticity and learning by regulating actin stability in dendritic spines.
Collapse
Affiliation(s)
- Norbert Bencsik
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Zsófia Szíber
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Hanna Liliom
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Krisztián Tárnok
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Sándor Borbély
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Márton Gulyás
- MTA-ELTE-NAP B Neuronal Cell Biology Research Group, H-1117 Budapest, Hungary
| | - Anikó Rátkai
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Attila Szűcs
- MTA-ELTE-NAP B Neuronal Cell Biology Research Group, H-1117 Budapest, Hungary
| | - Diána Hazai-Novák
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, H-1400 Budapest, Hungary
| | - Kornelia Ellwanger
- Institute of Cell Biology and Immunology, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Bence Rácz
- Department of Anatomy and Histology, Faculty of Veterinary Science, Szent István University, H-1400 Budapest, Hungary
| | - Klaus Pfizenmaier
- Institute of Cell Biology and Immunology, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Angelika Hausser
- Institute of Cell Biology and Immunology, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Katalin Schlett
- Department of Physiology and Neurobiology, Eötvös Loránd University, H-1117 Budapest, Hungary MTA-ELTE-NAP B Neuronal Cell Biology Research Group, H-1117 Budapest, Hungary
| |
Collapse
|
19
|
Tárnok K, Gulyás M, Bencsik N, Ferenc K, Pfizenmaier K, Hausser A, Schlett K. A new tool for the quantitative analysis of dendritic filopodial motility. Cytometry A 2014; 87:89-96. [PMID: 25257846 DOI: 10.1002/cyto.a.22569] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Revised: 08/05/2014] [Accepted: 09/01/2014] [Indexed: 02/02/2023]
Abstract
Dendritic filopodia are tiny and highly motile protrusions formed along the dendrites of neurons. During the search for future presynaptic partners, their shape and size change dynamically, with a direct impact on the formation, stabilization and maintenance of synaptic connections both in vivo and in vitro. In order to reveal molecular players regulating synapse formation, quantitative analysis of dendritic filopodia motility is needed. Defining the length or the tips of these protrusions manually, however, is time consuming, limiting the extent of studies as well as their statistical power. Additionally, area detection based on defining a single intensity threshold can lead to significant errors throughout the image series, as these small structures often have low contrast in fluorescent images. To overcome these problems, the open access Dendritic Filopodia Motility Analyzer, a semi-automated ImageJ/Fiji plugin was created. Our method calculates the displacement of the centre of mass (CoM) within a selected region based on the weighted intensity values of structure forming pixels, selected by upper and lower intensity thresholds. Using synthetic and real biological samples, we prove that the displacement of the weighted CoM reliably characterizes the motility of dendritic protrusions. Additionally, guidelines to define optimal parameters of live cell recordings from dendritic protrusions are provided. © 2014 International Society for Advancement of Cytometry.
Collapse
Affiliation(s)
- Krisztián Tárnok
- Department of Physiology and Neurobiology, Eötvös Loránd University, Pázmány P. stny. 1/C, H-1117, Budapest, Hungary
| | | | | | | | | | | | | |
Collapse
|
20
|
Sánchez-Ruiloba L, Aicart-Ramos C, García-Guerra L, Pose-Utrilla J, Rodríguez-Crespo I, Iglesias T. Protein kinase D interacts with neuronal nitric oxide synthase and phosphorylates the activatory residue serine 1412. PLoS One 2014; 9:e95191. [PMID: 24740233 PMCID: PMC3989272 DOI: 10.1371/journal.pone.0095191] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 03/24/2014] [Indexed: 12/20/2022] Open
Abstract
Neuronal Nitric Oxide Synthase (nNOS) is the biosynthetic enzyme responsible for nitric oxide (·NO) production in muscles and in the nervous system. This constitutive enzyme, unlike its endothelial and inducible counterparts, presents an N-terminal PDZ domain known to display a preference for PDZ-binding motifs bearing acidic residues at -2 position. In a previous work, we discovered that the C-terminal end of two members of protein kinase D family (PKD1 and PKD2) constitutes a PDZ-ligand. PKD1 has been shown to regulate multiple cellular processes and, when activated, becomes autophosphorylated at Ser916, a residue located at -2 position of its PDZ-binding motif. Since nNOS and PKD are spatially enriched in postsynaptic densities and dendrites, the main objective of our study was to determine whether PKD1 activation could result in a direct interaction with nNOS through their respective PDZ-ligand and PDZ domain, and to analyze the functional consequences of this interaction. Herein we demonstrate that PKD1 associates with nNOS in neurons and in transfected cells, and that kinase activation enhances PKD1-nNOS co-immunoprecipitation and subcellular colocalization. However, transfection of mammalian cells with PKD1 mutants and yeast two hybrid assays showed that the association of these two enzymes does not depend on PKD1 PDZ-ligand but its pleckstrin homology domain. Furthermore, this domain was able to pull-down nNOS from brain extracts and bind to purified nNOS, indicating that it mediates a direct PKD1-nNOS interaction. In addition, using mass spectrometry we demonstrate that PKD1 specifically phosphorylates nNOS in the activatory residue Ser1412, and that this phosphorylation increases nNOS activity and ·NO production in living cells. In conclusion, these novel findings reveal a crucial role of PKD1 in the regulation of nNOS activation and synthesis of ·NO, a mediator involved in physiological neuronal signaling or neurotoxicity under pathological conditions such as ischemic stroke or neurodegeneration.
Collapse
Affiliation(s)
- Lucía Sánchez-Ruiloba
- Instituto de Investigaciones Biomédicas “Alberto Sols”, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain
- CIBERNED, Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Instituto de Salud Carlos III, Madrid, Spain
| | - Clara Aicart-Ramos
- Departamento de Bioquímica y Biología Molecular I, Universidad Complutense de Madrid (UCM), Madrid, Spain
| | - Lucía García-Guerra
- Instituto de Investigaciones Biomédicas “Alberto Sols”, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain
- CIBERNED, Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Instituto de Salud Carlos III, Madrid, Spain
| | - Julia Pose-Utrilla
- Instituto de Investigaciones Biomédicas “Alberto Sols”, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain
- CIBERNED, Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Instituto de Salud Carlos III, Madrid, Spain
| | - Ignacio Rodríguez-Crespo
- Departamento de Bioquímica y Biología Molecular I, Universidad Complutense de Madrid (UCM), Madrid, Spain
- * E-mail: (IRC); (TI)
| | - Teresa Iglesias
- Instituto de Investigaciones Biomédicas “Alberto Sols”, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain
- CIBERNED, Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Instituto de Salud Carlos III, Madrid, Spain
- * E-mail: (IRC); (TI)
| |
Collapse
|
21
|
Li G, Wang Y. Protein kinase D: a new player among the signaling proteins that regulate functions in the nervous system. Neurosci Bull 2014; 30:497-504. [PMID: 24526660 DOI: 10.1007/s12264-013-1403-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Accepted: 06/07/2013] [Indexed: 10/25/2022] Open
Abstract
Protein kinase D (PKD) is an evolutionarily-conserved family of protein kinases. It has structural, regulatory, and enzymatic properties quite different from the PKC family. Many stimuli induce PKD signaling, including G-protein-coupled receptor agonists and growth factors. PKD1 is the most studied member of the family. It functions during cell proliferation, differentiation, secretion, cardiac hypertrophy, immune regulation, angiogenesis, and cancer. Previously, we found that PKD1 is also critically involved in pain modulation. Since then, a series of studies performed in our lab and by other groups have shown that PKDs also participate in other processes in the nervous system including neuronal polarity establishment, neuroprotection, and learning. Here, we discuss the connections between PKD structure, enzyme function, and localization, and summarize the recent findings on the roles of PKD-mediated signaling in the nervous system.
Collapse
Affiliation(s)
- Gang Li
- Neuroscience Research Institute and Department of Neurobiology, School of Basic Medical Sciences, Key Laboratory for Neuroscience, Ministry of Education/National Health and Family Planning Commission, Peking University, Beijing, 100191, China
| | | |
Collapse
|
22
|
BIG1, a brefeldin A-inhibited guanine nucleotide-exchange protein regulates neurite development via PI3K–AKT and ERK signaling pathways. Neuroscience 2013; 254:361-8. [DOI: 10.1016/j.neuroscience.2013.09.045] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Revised: 09/23/2013] [Accepted: 09/24/2013] [Indexed: 11/20/2022]
|
23
|
Jiang Q, Wang L, Guan Y, Xu H, Niu Y, Han L, Wei YP, Lin L, Chu J, Wang Q, Yang Y, Pei L, Wang JZ, Tian Q. Golgin-84-associated Golgi fragmentation triggers tau hyperphosphorylation by activation of cyclin-dependent kinase-5 and extracellular signal-regulated kinase. Neurobiol Aging 2013; 35:1352-63. [PMID: 24368089 DOI: 10.1016/j.neurobiolaging.2013.11.022] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 09/23/2013] [Accepted: 11/24/2013] [Indexed: 12/16/2022]
Abstract
Tau hyperphosphorylation is a critical event in Alzheimer's disease, in which the neuronal Golgi fragmentation occurs earlier than tau hyperphosphorylation. However, the intrinsic link between Golgi impairment and tau pathology is missing. By electron microscopy and western blotting, we observed in the present study that the neuronal Golgi fragmentation was increased age-dependently with a correlated tau hyperphosphorylation in the brains of C57BL/6 mice aged from 4 to 16 months. Simultaneously, golgin-84 and Golgi reassembly stacking protein 65, 2 important Golgi matrix proteins, were decreased in the brains of elder mice. Further studies in HEK293/tau cells showed that Golgi-disturbing agents, brefeldin A and nocodazole induced tau hyperphosphorylation. Knockdown of golgin-84, not Golgi reassembly stacking protein 65, by small interfering RNA was sufficient to induce tau hyperphosphorylation, while over-expressing golgin-84 arrested the brefeldin A-induced Golgi fragmentation and tau hyperphosphorylation. Finally, we demonstrated that cyclin-dependent kinase-5 and extracellular signal-regulated kinase were activated after golgin-84 knockdown, and simultaneous inhibition of these kinases abolished the golgin-84 deficit-induced tau hyperphosphorylation. These data suggest Golgi fragmentation could be an upstream event triggering tau hyperphosphorylation through golgin-84 deficit-induced activation of cyclin-dependent kinase-5 and extracellular signal-regulated kinase.
Collapse
Affiliation(s)
- Qian Jiang
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Present address: Department of Dermatology, The First Hospital of Wuhan, Wuhan, China
| | - Lu Wang
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yang Guan
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hui Xu
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yi Niu
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Li Han
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yu-Ping Wei
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Li Lin
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jiang Chu
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qun Wang
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ying Yang
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Lei Pei
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jian-Zhi Wang
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
| | - Qing Tian
- Department of Pathology and Pathophysiology, Ultrastructural Pathology Center, Key Laboratory of Neurological Disease of National Education Ministry and Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
| |
Collapse
|
24
|
Li C, Chen S, Yu Y, Zhou C, Wang Y, Le K, Li D, Shao W, Lu L, You Y, Peng J, Huang H, Liu P, Shen X. BIG1, a brefeldin A-inhibited guanine nucleotide-exchange factor, is required for GABA-gated Cl⁻ influx through regulation of GABAA receptor trafficking. Mol Neurobiol 2013; 49:808-19. [PMID: 24198228 DOI: 10.1007/s12035-013-8558-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Accepted: 09/22/2013] [Indexed: 10/26/2022]
Abstract
GABAA receptors (GABAARs) mediate the majority of fast synaptic inhibition. Trafficking regulation and protein-protein interactions that maintain the appropriate number of GABAARs at the cell surface are considered to be important mechanisms for controlling the strength of synaptic inhibition. Here, we report that BIG1, a brefeldin A (BFA)-inhibited guanine nucleotide-exchange factor (GEF) which has a known role in vesicle trafficking, is a new binding partner of GABAARs. Treatment of neurons with BFA, an uncompetitive inhibitor of BIG1 GEF activity, or depletion of BIG1 by small RNA interference (siRNA) significantly decreased GABAARs at the neuronal surface and suppressed GABA-gated influx of chloride ions. Over-expression of HA-tagged BIG1-E793K, a dominant-negative mutant, also significantly decreased GABAARs at the neuronal surface, but had no effect on the total amount of GABAARs. Inhibition of GABAAR endocytosis by muscimol increased both GABAARs and BIG1 at the neuronal surface in a time-dependent fashion, and this increase could be abolished by bicuculline. Finally, depletion of BIG1 by siRNA inhibited the muscimol-stimulated increase of GABAARs. Those data suggest an important function of BIG1 in trafficking of GABAARs to the cell surface through its GEF activity. Thus, we identify an important role of BIG1 in modulating GABA-gated Cl(-) influx through the regulation of cell surface expression of GABAARs.
Collapse
Affiliation(s)
- Cuixian Li
- Laboratory of Pharmacology and Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, No. 132, Waihuan East Road, Higher Education Mega Center, Guangzhou, 510006, People's Republic of China
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Xu P, Rosen KM, Hedstrom K, Rey O, Guha S, Hart C, Corfas G. Nerve injury induces glial cell line-derived neurotrophic factor (GDNF) expression in Schwann cells through purinergic signaling and the PKC-PKD pathway. Glia 2013; 61:1029-40. [PMID: 23553603 DOI: 10.1002/glia.22491] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 02/06/2013] [Indexed: 12/22/2022]
Abstract
Upon peripheral nerve injury, specific molecular events, including increases in the expression of selected neurotrophic factors, are initiated to prepare the tissue for regeneration. However, the mechanisms underlying these events and the nature of the cells involved are poorly understood. We used the injury-induced upregulation of glial cell-derived neurotrophic factor (GDNF) expression as a tool to gain insights into these processes. We found that both myelinating and nonmyelinating Schwann cells are responsible for the dramatic increase in GDNF expression after injury. We also demonstrate that the GDNF upregulation is mediated by a signaling cascade involving activation of Schwann cell purinergic receptors, followed by protein kinase C signaling which activates protein kinase D (PKD), which leads to increased GDNF transcription. Given the potent effects of GDNF on survival and repair of injured peripheral neurons, we propose that targeting these pathways may yield therapeutic tools to treat peripheral nerve injury and neuropathies.
Collapse
Affiliation(s)
- Pin Xu
- F.M. Kirby Neurobiology Center, Children's Hospital Boston, Boston, MA, USA
| | | | | | | | | | | | | |
Collapse
|
26
|
Ellwanger K, Hausser A. Physiological functions of protein kinase D in vivo. IUBMB Life 2013; 65:98-107. [PMID: 23288632 DOI: 10.1002/iub.1116] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2012] [Accepted: 10/25/2012] [Indexed: 11/10/2022]
Abstract
The cellular functions of the serine/threonine protein kinase D (PKD) have been extensively studied within the last decade and distinct roles such as fission of vesicles at the Golgi compartment, coordination of cell migration and invasion, and regulation of gene transcription have been correlated with this kinase family. Here, we highlight the current state of in vivo studies on PKD function with a focus on animal models and discuss the molecular basis of the observed phenotypic characteristics associated with this kinase family.
Collapse
Affiliation(s)
- Kornelia Ellwanger
- Institute of Cell Biology and Immunology, University of Stuttgart, Allmandring 31, Stuttgart, Germany
| | | |
Collapse
|
27
|
Fujishima K, Horie R, Mochizuki A, Kengaku M. Principles of branch dynamics governing shape characteristics of cerebellar Purkinje cell dendrites. Development 2012; 139:3442-55. [PMID: 22912417 PMCID: PMC3491647 DOI: 10.1242/dev.081315] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Neurons develop dendritic arbors in cell type-specific patterns. Using growing Purkinje cells in culture as a model, we performed a long-term time-lapse observation of dendrite branch dynamics to understand the rules that govern the characteristic space-filling dendrites. We found that dendrite architecture was sculpted by a combination of reproducible dynamic processes, including constant tip elongation, stochastic terminal branching, and retraction triggered by contacts between growing dendrites. Inhibition of protein kinase C/protein kinase D signaling prevented branch retraction and significantly altered the characteristic morphology of long proximal segments. A computer simulation of dendrite branch dynamics using simple parameters from experimental measurements reproduced the time-dependent changes in the dendrite configuration in live Purkinje cells. Furthermore, perturbation analysis to parameters in silico validated the important contribution of dendritic retraction in the formation of the characteristic morphology. We present an approach using live imaging and computer simulations to clarify the fundamental mechanisms of dendrite patterning in the developing brain.
Collapse
Affiliation(s)
- Kazuto Fujishima
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida Honmachi, Kyoto 606-8501, Japan.
| | | | | | | |
Collapse
|
28
|
14q12 and severe Rett-like phenotypes: new clinical insights and physical mapping of FOXG1-regulatory elements. Eur J Hum Genet 2012; 20:1216-23. [PMID: 22739344 DOI: 10.1038/ejhg.2012.127] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The Forkhead box G1 (FOXG1) gene has been implicated in severe Rett-like phenotypes. It encodes the Forkhead box protein G1, a winged-helix transcriptional repressor critical for forebrain development. Recently, the core FOXG1 syndrome was defined as postnatal microcephaly, severe mental retardation, absent language, dyskinesia, and dysgenesis of the corpus callosum. We present seven additional patients with a severe Rett-like neurodevelopment disorder associated with de novo FOXG1 point mutations (two cases) or 14q12 deletions (five cases). We expand the mutational spectrum in patients with FOXG1-related encephalopathies and precise the core FOXG1 syndrome phenotype. Dysgenesis of the corpus callosum and dyskinesia are not always present in FOXG1-mutated patients. We believe that the FOXG1 gene should be considered in severely mentally retarded patients (no speech-language) with severe acquired microcephaly (-4 to-6 SD) and few clinical features suggestive of Rett syndrome. Interestingly enough, three 14q12 deletions that do not include the FOXG1 gene are associated with phenotypes very reminiscent to that of FOXG1-mutation-positive patients. We physically mapped a putative long-range FOXG1-regulatory element in a 0.43 Mb DNA segment encompassing the PRKD1 locus. In fibroblast cells, a cis-acting regulatory sequence located more than 0.6 Mb away from FOXG1 acts as a silencer at the transcriptional level. These data are important for clinicians and for molecular biologists involved in the management of patients with severe encephalopathies compatible with a FOXG1-related phenotype.
Collapse
|
29
|
Abstract
Skeletal muscle responds to exercise by activation of signalling pathways that co-ordinate gene expression to sustain muscle performance. MEF2 (myocyte enhancer factor 2)-dependent transcriptional activation of MHC (myosin heavy chain) genes promotes the transformation from fast-twitch into slow-twitch fibres, with MEF2 activity being tightly regulated by interaction with class IIa HDACs (histone deacetylases). PKD (protein kinase D) is known to directly phosphorylate skeletal muscle class IIa HDACs, mediating their nuclear export and thus derepression of MEF2. In the present study, we report the generation of transgenic mice with inducible conditional expression of a dominant-negative PKD1kd (kinase-dead PKD1) protein in skeletal muscle to assess the role of PKD in muscle function. In control mice, long-term voluntary running experiments resulted in a switch from type IIb+IId/x to type IIa plantaris muscle fibres as measured by indirect immunofluorescence of MHCs isoforms. In mice expressing PKD1kd, this fibre type switch was significantly impaired. These mice exhibited altered muscle fibre composition and decreased running performance compared with control mice. Our findings thus indicate that PKD activity is essential for exercise-induced MEF2-dependent skeletal muscle remodelling in vivo.
Collapse
|
30
|
Abstract
The Transient receptor potential (TRP) family of cation channels is a large protein family, which is mainly structurally uniform. Proteins consist typically of six transmembrane domains and mostly four subunits are necessary to form a functional channel. Apart from this, TRP channels display a wide variety of activation mechanisms (ligand binding, G-protein coupled receptor dependent, physical stimuli such as temperature, pressure, etc.) and ion selectivity profiles (from highly Ca(2+) selective to non-selective for cations). They have been described now in almost every tissue of the body, including peripheral and central neurons. Especially in the sensory nervous system the role of several TRP channels is already described on a detailed level. This review summarizes data that is currently available on their role in the central nervous system. TRP channels are involved in neurogenesis and brain development, synaptic transmission and they play a key role in the development of several neurological diseases.
Collapse
|
31
|
Abstract
The Golgi is essential for processing proteins and sorting them, as well as plasma membrane components, to their final destinations. Not surprisingly, this organelle, a major compartment of the secretory pathway, is an important venue for regulating many aspects of development in both invertebrates and vertebrates. Through its role as a site for protein cleavage and glycosylation as well as through changes in its spatial organization and secretory trafficking, the Golgi exerts highly specific effects on cellular differentiation and morphogenesis by spatially and temporally constraining developmental pathways.
Collapse
|
32
|
Fu Y, Rubin CS. Protein kinase D: coupling extracellular stimuli to the regulation of cell physiology. EMBO Rep 2011; 12:785-96. [PMID: 21738220 DOI: 10.1038/embor.2011.139] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Accepted: 06/17/2011] [Indexed: 01/07/2023] Open
Abstract
Protein kinase D (PKD) mediates the actions of stimuli that promote diacylglycerol (DAG) biogenesis. By phosphorylating effectors that regulate transcription, fission and polarized transport of Golgi vesicles, as well as cell migration and survival after oxidative stress, PKDs substantially expand the range of physiological processes controlled by DAG. Dysregulated PKDs have been linked to pathologies including heart hypertrophy and cancer invasiveness. Our understanding of PKD regulation by trans- and autophosphorylation, as well as the subcellular dynamics of PKD substrate phosphorylation, have increased markedly. Selective PKD inhibitors provide new, powerful tools for elucidating the physiological roles of PKDs and potentially treating cardiac disease and cancer.
Collapse
Affiliation(s)
- Ya Fu
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, New York 10461, USA
| | | |
Collapse
|
33
|
Rozengurt E. Protein kinase D signaling: multiple biological functions in health and disease. Physiology (Bethesda) 2011; 26:23-33. [PMID: 21357900 DOI: 10.1152/physiol.00037.2010] [Citation(s) in RCA: 176] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Protein kinase D (PKD) is an evolutionarily conserved protein kinase family with structural, enzymological, and regulatory properties different from the PKC family members. Signaling through PKD is induced by a remarkable number of stimuli, including G-protein-coupled receptor agonists and polypeptide growth factors. PKD1, the most studied member of the family, is increasingly implicated in the regulation of a complex array of fundamental biological processes, including signal transduction, cell proliferation and differentiation, membrane trafficking, secretion, immune regulation, cardiac hypertrophy and contraction, angiogenesis, and cancer. PKD mediates such a diverse array of normal and abnormal biological functions via dynamic changes in its spatial and temporal localization, combined with its distinct substrate specificity. Studies on PKD thus far indicate a striking diversity of both its signal generation and distribution and its potential for complex regulatory interactions with multiple downstream pathways, often regulating the subcellular localization of its targets.
Collapse
Affiliation(s)
- Enrique Rozengurt
- Department of Medicine, Division of Digestive Diseases, David Geffen School of Medicine, CURE: Digestive Diseases Research Center and Molecular Biology Institute, University of California, Los Angeles, California, USA.
| |
Collapse
|
34
|
Yang SH, Jeng CJ, Chen CH, Chen Y, Chen YC, Wang SM. Schisandrin enhances dendrite outgrowth and synaptogenesis in primary cultured hippocampal neurons. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2011; 91:694-702. [PMID: 21302324 DOI: 10.1002/jsfa.4238] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BACKGROUND Schisandra chinensis, commonly used in Asia for tea material and traditional Chinese medicine, is presumed to enhance mental and intellectual functions. In this study, the effects and signalling mechanisms of a purified compound schisandrin, one of the lignan of Schisandra chinensis, on primary cultured hippocampal neurons were investigated. RESULTS Schisandrin treatment enhanced total dendritic length and branching complexity, both of which were significantly suppressed in the presence of specific blockers for calmodulin-dependent kinase II (CaMKII), protein kinase C epsilon (PKCε), and mitogen activated protein kinase kinase (MEK). Moreover, schisandrin induced calcium influx, and phosphorylation of CaMKII, PKCε, and MEK. Inhibition of CAMKII and PKCε attenuated the schisandrin-induced phosphorylation of PKCε and MEK, and the phosphorylation of MEK, respectively. Moreover, schisandrin also stimulated the phosphorylation of cyclic AMP responsive-element binding protein (CREB) at Ser-133, an effect that was blocked by KN93. In addition to its neuritogenic effects, schisandrin increased the numbers of postsynaptic density-95-positive and FM1-43-positive puncta in dendrites and synaptic boutons, respectively. CONCLUSION In hippocampal neurons, schisandrin exhibits neurotrophic properties that are mediated by the CaMKII-PKCε-MEK pathway.
Collapse
Affiliation(s)
- Shih-Hung Yang
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, No. 1, Section 1, Jen-Ai Road, Taipei 10051, Taiwan
| | | | | | | | | | | |
Collapse
|
35
|
Ziegler S, Eiseler T, Scholz RP, Beck A, Link G, Hausser A. A novel protein kinase D phosphorylation site in the tumor suppressor Rab interactor 1 is critical for coordination of cell migration. Mol Biol Cell 2011; 22:570-80. [PMID: 21209314 PMCID: PMC3046055 DOI: 10.1091/mbc.e10-05-0427] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
RIN1 is a regulator of epithelial cell migration. We identify serine 292 as a novel phosphorylation site for PKD in RIN1. Phosphorylation at this site controls RIN1-mediated inhibition of cell migration by modulating the direct activation of Abl kinases. The multifunctional signal adapter protein Ras and Rab interactor 1 (RIN1) is a Ras effector protein involved in the regulation of epithelial cell processes such as cell migration and endocytosis. RIN1 signals via two downstream pathways, namely the activation of Rab5 and Abl family kinases. Protein kinase D (PKD) phosphorylates RIN1 at serine 351 in vitro, thereby regulating interaction with 14–3-3 proteins. Here, we report the identification of serine 292 in RIN1 as an in vivo PKD phosphorylation site. PKD-mediated phosphorylation at this site was confirmed with a phospho-specific antibody and by mass spectrometry. We demonstrate that phosphorylation at serine 292 controls RIN1-mediated inhibition of cell migration by modulating the activation of Abl kinases. We further provide evidence that RIN1 in vivo phosphorylation at serine 351 occurs independently of PKD. Collectively, our data identify a novel PKD signaling pathway through RIN1 and Abl kinases that is involved in the regulation of actin remodeling and cell migration.
Collapse
Affiliation(s)
- Susanne Ziegler
- Institute of Cell Biology and Immunology, University of Stuttgart, 70569 Stuttgart, Germany Panatecs GmbH, 72070 Tübingen, Germany
| | | | | | | | | | | |
Collapse
|
36
|
Irannejad R, Wedegaertner PB. Regulation of constitutive cargo transport from the trans-Golgi network to plasma membrane by Golgi-localized G protein betagamma subunits. J Biol Chem 2010; 285:32393-404. [PMID: 20720014 DOI: 10.1074/jbc.m110.154963] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Observations of Golgi fragmentation upon introduction of G protein βγ (Gβγ) subunits into cells have implicated Gβγ in a pathway controlling the fission at the trans-Golgi network (TGN) of plasma membrane (PM)-destined transport carriers. However, the subcellular location where Gβγ acts to provoke Golgi fragmentation is not known. Additionally, a role for Gβγ in regulating TGN-to-PM transport has not been demonstrated. Here we report that constitutive or inducible targeting of Gβγ to the Golgi, but not other subcellular locations, causes phospholipase C- and protein kinase D-dependent vesiculation of the Golgi in HeLa cells; Golgi-targeted β(1)γ(2) also activates protein kinase D. Moreover, the novel Gβγ inhibitor, gallein, and the Gβγ-sequestering protein, GRK2ct, reveal that Gβγ is required for the constitutive PM transport of two model cargo proteins, VSV-G and ss-HRP. Importantly, Golgi-targeted GRK2ct, but not a PM-targeted GRK2ct, also blocks protein transport to the PM. To further support a role for Golgi-localized Gβγ, endogenous Gβ was detected at the Golgi in HeLa cells. These results are the first to establish a role for Golgi-localized Gβγ in regulating protein transport from the TGN to the cell surface.
Collapse
Affiliation(s)
- Roshanak Irannejad
- Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA
| | | |
Collapse
|
37
|
Krueger DD, Osterweil EK, Bear MF. Activation of mGluR5 induces rapid and long-lasting protein kinase D phosphorylation in hippocampal neurons. J Mol Neurosci 2010; 42:1-8. [PMID: 20177824 DOI: 10.1007/s12031-010-9338-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2010] [Accepted: 01/29/2010] [Indexed: 10/19/2022]
Abstract
Metabotropic glutamate receptors (mGluRs), including mGluR5, play a central role in regulating the strength and plasticity of synaptic connections in the brain. However, the signaling pathways that connect mGluRs to their downstream effectors are not yet fully understood. Here, we report that stimulation of mGluR5 in hippocampal cultures and slices results in phosphorylation of protein kinase D (PKD) at the autophosphorylation site Ser-916. This phosphorylation event occurs within 30 s of stimulation, persists for at least 24 h, and is dependent on activation of phospholipase C and protein kinase C. Our data suggest that activation of PKD may represent a novel signaling pathway linking mGluR5 to its downstream targets. These findings have important implications for the study of the molecular mechanisms underlying mGluR-dependent synaptic plasticity.
Collapse
Affiliation(s)
- Dilja D Krueger
- Howard Hughes Medical Institute, Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, 43 Vassar St, 46-3301, Cambridge, MA 02139, USA
| | | | | |
Collapse
|
38
|
Higuero AM, Sánchez-Ruiloba L, Doglio LE, Portillo F, Abad-Rodríguez J, Dotti CG, Iglesias T. Kidins220/ARMS modulates the activity of microtubule-regulating proteins and controls neuronal polarity and development. J Biol Chem 2009; 285:1343-57. [PMID: 19903810 DOI: 10.1074/jbc.m109.024703] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
In order for neurons to perform their function, they must establish a highly polarized morphology characterized, in most of the cases, by a single axon and multiple dendrites. Herein we find that the evolutionarily conserved protein Kidins220 (kinase D-interacting substrate of 220-kDa), also known as ARMS (ankyrin repeat-rich membrane spanning), a downstream effector of protein kinase D and neurotrophin and ephrin receptors, regulates the establishment of neuronal polarity and development of dendrites. Kidins220/ARMS gain and loss of function experiments render severe phenotypic changes in the processes extended by hippocampal neurons in culture. Although Kidins220/ARMS early overexpression hinders neuronal development, its down-regulation by RNA interference results in the appearance of multiple longer axon-like extensions as well as aberrant dendritic arbors. We also find that Kidins220/ARMS interacts with tubulin and microtubule-regulating molecules whose role in neuronal morphogenesis is well established (microtubule-associated proteins 1b, 1a, and 2 and two members of the stathmin family). Importantly, neurons where Kidins220/ARMS has been knocked down register changes in the phosphorylation activity of MAP1b and stathmins. Altogether, our results indicate that Kidins220/ARMS is a key modulator of the activity of microtubule-regulating proteins known to actively regulate neuronal morphogenesis and suggest a mechanism by which it contributes to control neuronal development.
Collapse
Affiliation(s)
- Alonso M Higuero
- Instituto de Investigaciones Biomédicas de Madrid Alberto Sols, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, Madrid 28029, Spain
| | | | | | | | | | | | | |
Collapse
|
39
|
Sann S, Wang Z, Brown H, Jin Y. Roles of endosomal trafficking in neurite outgrowth and guidance. Trends Cell Biol 2009; 19:317-24. [PMID: 19540123 DOI: 10.1016/j.tcb.2009.05.001] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2009] [Revised: 05/04/2009] [Accepted: 05/07/2009] [Indexed: 02/06/2023]
Abstract
Membrane trafficking and cargo delivery are essential for axonal and dendritic growth and guidance. Neurons have numerous diverse post-Golgi vesicles and recent advances have clarified their identity and regulation. Combinatorial approaches using in vivo imaging of 'intracellular cargo address labels' and functional perturbation have provided insight into these processes. In particular, the UNC-51 kinase regulates the trafficking of early endosomes and their axon guidance molecular cargos in several types of neurons in multiple organisms. Vesicular compartments bearing features of recycling endosomes, late endosomes or lysosomes also contribute to membrane addition and protein trafficking during neurite outgrowth and extension. New work shows that ubiquitylation of cargos and Rab effectors further specifies the trafficking routes of post-Golgi vesicles. These findings have begun to provide a more detailed view of the molecular mechanisms involved in neurite outgrowth and guidance. Additionally, high-resolution light microscopy imaging promises greater temporal and spatial understanding of vesicular exchange and maturation in neurons in the near future.
Collapse
Affiliation(s)
- Sharon Sann
- Division of Biological Sciences, University of California, San Diego, CA 92093, USA.
| | | | | | | |
Collapse
|