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Müller JA, Betzin J, Santos-Tejedor J, Mayer A, Oprişoreanu AM, Engholm-Keller K, Paulußen I, Gulakova P, McGovern TD, Gschossman LJ, Schönhense E, Wark JR, Lamprecht A, Becker AJ, Waardenberg AJ, Graham ME, Dietrich D, Schoch S. A presynaptic phosphosignaling hub for lasting homeostatic plasticity. Cell Rep 2022; 39:110696. [PMID: 35443170 DOI: 10.1016/j.celrep.2022.110696] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 11/26/2021] [Accepted: 03/29/2022] [Indexed: 11/29/2022] Open
Abstract
Stable function of networks requires that synapses adapt their strength to levels of neuronal activity, and failure to do so results in cognitive disorders. How such homeostatic regulation may be implemented in mammalian synapses remains poorly understood. Here we show that the phosphorylation status of several positions of the active-zone (AZ) protein RIM1 are relevant for synaptic glutamate release. Position RIMS1045 is necessary and sufficient for expression of silencing-induced homeostatic plasticity and is kept phosphorylated by serine arginine protein kinase 2 (SRPK2). SRPK2-induced upscaling of synaptic release leads to additional RIM1 nanoclusters and docked vesicles at the AZ and is not observed in the absence of RIM1 and occluded by RIMS1045E. Our data suggest that SRPK2 and RIM1 represent a presynaptic phosphosignaling hub that is involved in the homeostatic balance of synaptic coupling of neuronal networks.
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Affiliation(s)
- Johannes Alexander Müller
- Section for Translational Epilepsy Research, Department of Neuropathology, University Hospital Bonn, Bonn, Germany; Department of Neurosurgery, University Hospital Bonn, Bonn, Germany
| | - Julia Betzin
- Section for Translational Epilepsy Research, Department of Neuropathology, University Hospital Bonn, Bonn, Germany
| | - Jorge Santos-Tejedor
- Section for Translational Epilepsy Research, Department of Neuropathology, University Hospital Bonn, Bonn, Germany
| | - Annika Mayer
- Section for Translational Epilepsy Research, Department of Neuropathology, University Hospital Bonn, Bonn, Germany
| | - Ana-Maria Oprişoreanu
- Section for Translational Epilepsy Research, Department of Neuropathology, University Hospital Bonn, Bonn, Germany
| | - Kasper Engholm-Keller
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark; Synapse Proteomics, Children's Medical Research Institute, The University of Sydney, Westmead, NSW, Australia
| | | | - Polina Gulakova
- Section for Translational Epilepsy Research, Department of Neuropathology, University Hospital Bonn, Bonn, Germany; Department of Neurosurgery, University Hospital Bonn, Bonn, Germany
| | | | - Lena Johanna Gschossman
- Section for Translational Epilepsy Research, Department of Neuropathology, University Hospital Bonn, Bonn, Germany; Department of Neurosurgery, University Hospital Bonn, Bonn, Germany
| | - Eva Schönhense
- Section for Translational Epilepsy Research, Department of Neuropathology, University Hospital Bonn, Bonn, Germany
| | - Jesse R Wark
- Synapse Proteomics, Children's Medical Research Institute, The University of Sydney, Westmead, NSW, Australia
| | - Alf Lamprecht
- Department of Pharmaceutics, Bonn University, Bonn, Germany
| | - Albert J Becker
- Section for Translational Epilepsy Research, Department of Neuropathology, University Hospital Bonn, Bonn, Germany
| | - Ashley J Waardenberg
- Australian Institute for Tropical Health and Medicine, James Cook University, Smithfield, QLD 4878, Australia; i-Synapse, Cairns, QLD, Australia
| | - Mark E Graham
- Synapse Proteomics, Children's Medical Research Institute, The University of Sydney, Westmead, NSW, Australia
| | - Dirk Dietrich
- Department of Neurosurgery, University Hospital Bonn, Bonn, Germany.
| | - Susanne Schoch
- Section for Translational Epilepsy Research, Department of Neuropathology, University Hospital Bonn, Bonn, Germany.
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Chiou YR, Cheng HC, Wang AG. Astrocytic hamartoma in a patient heterozygous for RIM1 mutation associated-retinal dystrophy. Ophthalmic Genet 2022; 43:409-412. [PMID: 35014575 DOI: 10.1080/13816810.2022.2025604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND Autosomal-dominant cone-rod dystrophy 7 (CORD7) has been documented in association with RIM1 mutation (c.2459 G>A). We report a patient with retinal dystrophy who was heterozygous for RIM1 missense variant with a newly found point mutation (c.4036 G>T). Clinical findings of this genetic variant manifested differently from a typical CORD7. In addition, astrocytic hamartomas at bilateral optic discs are also a unique feature, which has not been described in CORD previously. MATERIALS AND METHODS Medical records of this patient were retrospectively reviewed. Genetic testing with whole exon sequencing was performed. RESULTS This 43-year-old female with history of decreased night vision since childhood came to our hospital complaining of blurred vision in both eyes for more than half a year. Her best-corrected visual acuity was 20/200 in both eyes. Dilated fundoscopic examination revealed symmetric diffuse atrophy of retinal pigment epithelium with peripheral pigmentary clumps. Also, optic disc astrocytic hamartomas were found bilaterally. Optical coherence tomography revealed extensive disruption of inner segment/outer segment junction in both eyes. Visual field test showed severe peripheral defect sparing central vision. Electroretinogram demonstrated both rod and cone cells abnormalities. Subsequent genetic testing reported heterozygosity for the RIM1 (c.4036 G>T) mutation. CONCLUSIONS This is the first reported case of RIM1 mutation-associated retinal dystrophy with a newly found point mutation (c.4036 G>T), which presented differently from a typical CORD7 and more similarly to the phenotype of RP. Furthermore, our finding of bilateral optic disc astrocytic hamartomas has not been reported in association with CORD previously.
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Affiliation(s)
- Yi-Ran Chiou
- Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Hui-Chen Cheng
- Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan.,School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - An-Guor Wang
- Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan.,School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
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Smaga I, Wydra K, Frankowska M, Fumagalli F, Sanak M, Filip M. Cocaine Self-Administration and Abstinence Modulate NMDA Receptor Subunits and Active Zone Proteins in the Rat Nucleus Accumbens. Molecules 2020; 25:molecules25153480. [PMID: 32751823 PMCID: PMC7436251 DOI: 10.3390/molecules25153480] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 07/28/2020] [Accepted: 07/30/2020] [Indexed: 12/21/2022] Open
Abstract
Cocaine-induced plasticity in the glutamatergic transmission and its N-methyl-d-aspartate (NMDA) receptors are critically involved in the development of substance use disorder. The presynaptic active zone proteins control structural synaptic plasticity; however, we are still far from understanding the molecular determinants important for cocaine seeking behavior. The aim of this study was to investigate the effect of cocaine self-administration and different conditions of cocaine forced abstinence on the composition of the NMDA receptor subunits and on the levels of active zone proteins, i.e., Ras-related protein 3A (Rab3A), Rab3 interacting molecules 1 (RIM1) and mammalian uncoordinated protein 13 (Munc13) in the rat nucleus accumbens. We found an up-regulation of the accumbal levels of GluN1 and GluN2A following cocaine self-administration that was paralleled by an increase of Munc13 and RIM1 levels. At the same time, we also demonstrated that different conditions of cocaine abstinence abolished changes in NMDA receptor subunits (except for higher GluN1 levels after cocaine abstinence with extinction training), while an increase in the Munc13 concentration was shown in rats housed in an enriched environment. In conclusion, cocaine self-administration is associated with the specific up-regulation of the NMDA receptor subunit composition and is related with new presynaptic targets controlling neurotransmitter release. Moreover, changes observed in cocaine abstinence with extinction training and in an enriched environment in the levels of NMDA receptor subunit and in the active zone protein, respectively, may represent a potential regulatory step in cocaine-seeking behavior.
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Affiliation(s)
- Irena Smaga
- Maj Institute of Pharmacology Polish Academy of Sciences, Department of Drug Addiction Pharmacology, Smętna 12, PL 31-343 Kraków, Poland; (K.W.); (M.F.); (M.F.)
- Correspondence: ; Tel.: +48-12-6623268; Fax: +48-12-6374500
| | - Karolina Wydra
- Maj Institute of Pharmacology Polish Academy of Sciences, Department of Drug Addiction Pharmacology, Smętna 12, PL 31-343 Kraków, Poland; (K.W.); (M.F.); (M.F.)
| | - Małgorzata Frankowska
- Maj Institute of Pharmacology Polish Academy of Sciences, Department of Drug Addiction Pharmacology, Smętna 12, PL 31-343 Kraków, Poland; (K.W.); (M.F.); (M.F.)
| | - Fabio Fumagalli
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Via Balzaretti 9, 20133 Milano, Italy;
| | - Marek Sanak
- Department of Internal Medicine, Jagiellonian University Medical College, Skawińska 8, PL 31-066 Kraków, Poland;
| | - Małgorzata Filip
- Maj Institute of Pharmacology Polish Academy of Sciences, Department of Drug Addiction Pharmacology, Smętna 12, PL 31-343 Kraków, Poland; (K.W.); (M.F.); (M.F.)
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Kupferschmidt DA, Augustin SM, Johnson KA, Lovinger DM. Active Zone Proteins RIM1αβ Are Required for Normal Corticostriatal Transmission and Action Control. J Neurosci 2019; 39:1457-70. [PMID: 30559150 DOI: 10.1523/JNEUROSCI.1940-18.2018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 11/13/2018] [Accepted: 12/04/2018] [Indexed: 11/21/2022] Open
Abstract
Dynamic regulation of synaptic transmission at cortical inputs to the dorsal striatum is considered critical for flexible and efficient action learning and control. Presynaptic mechanisms governing the properties and plasticity of glutamate release from these inputs are not fully understood, and the corticostriatal synaptic processes that support normal action learning and control remain unclear. Here we show in male and female mice that conditional deletion of presynaptic proteins RIM1αβ (RIM1) from excitatory cortical neurons impairs corticostriatal synaptic transmission in the dorsolateral striatum. Key forms of presynaptic G-protein-coupled receptor-mediated short- and long-term striatal plasticity are spared following RIM1 deletion. Conditional RIM1 KO mice show heightened novelty-induced locomotion and impaired motor learning on the accelerating rotarod. They further show heightened self-paced instrumental responding for food and impaired learning of a habitual instrumental response strategy. Together, these findings reveal a selective role for presynaptic RIM1 in neurotransmitter release at prominent basal ganglia synapses, and provide evidence that RIM1-dependent processes help to promote the refinement of skilled actions, constrain goal-directed behaviors, and support the learning and use of habits.SIGNIFICANCE STATEMENT Our daily functioning hinges on the ability to flexibly and efficiently learn and control our actions. How the brain encodes these capacities is unclear. Here we identified a selective role for presynaptic proteins RIM1αβ in controlling glutamate release from cortical inputs to the dorsolateral striatum, a brain structure critical for action learning and control. Behavioral analysis of mice with restricted genetic deletion of RIM1αβ further revealed roles for RIM1αβ-dependent processes in the learning and refinement of motor skills and the balanced expression of goal-directed and habitual actions.
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Fu P, Wen Y, Xiong Y, Zhang Y, Zhang H, Xie Y, Shi Q. Abnormal Expression of FBXL20 in Refractory Epilepsy Patients and a Pilocarpine-Induced Rat Model. Neurochem Res 2016; 41:3020-3031. [PMID: 27502938 DOI: 10.1007/s11064-016-2021-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Revised: 07/08/2016] [Accepted: 07/28/2016] [Indexed: 10/21/2022]
Abstract
E3 ubiquitin ligases are important protein-modifying enzymes involved in the pathogenesis of a variety of neurodegenerative diseases. F-box and leucine-rich repeat protein 20 (FBXL20), an E3 ubiquitin ligase widely expressed in the central nervous system, plays an important role in the ubiquitin-dependent degradation of regulating synaptic membrane exocytosis 1 (RIM1), which is an important factor in the release of synaptic vesicles. FBXL20 has been associated with a variety of neurodegenerative diseases; thus, we hypothesized that FBXL20 is involved in the development of epilepsy. Herein, we used immunofluorescence staining, immunohistochemistry and western blotting to determine the expression pattern of FBXL20 in temporal lobe epilepsy patients and pilocarpine-induced epilepsy animal models. We also injected SD rats with lentivirus-vector mediated overexpression of FBXL20. The results showed that FBXL20 is expressed in the membrane and the cytoplasm of cortical neurons, and overexpression of FBXL20 decreased the onset level of spontaneous seizure, the frequency and duration of seizures. Additionally, FBXL20 protein level was decreased but RIM1 protein level was increased in the epileptic group compared with the LV-FBXL20 and LV-GFP group. These findings in humans were consistent with the results from a pilocarpine-induced animal model of chronic epilepsy. Thus, abnormal expression of FBXL20 might play an important role in the development of epilepsy.
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Affiliation(s)
- Pengfei Fu
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - YueTao Wen
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Yan Xiong
- Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Yanke Zhang
- Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Haiyang Zhang
- Department of Pediatric Intensive Care Unit, West China Second University Hospital, Sichuan University, Chengdu, 610000, China
| | - Yanfeng Xie
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Quanhong Shi
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China.
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Warwick AN, Shawkat F, Lotery AJ. Retinitis pigmentosa and bilateral cystoid macular oedema in a patient heterozygous for the RIM1 mutation previously associated with cone-rod dystrophy 7. Ophthalmic Genet 2016; 38:178-182. [PMID: 27176872 DOI: 10.1080/13816810.2016.1183215] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
BACKGROUND Autosomal dominant cone-rod dystrophy 7 (CORD7) has been previously associated with the RIM1 c.2459G>A (Arg820His) mutation. Cystoid macular oedema (CMO) is a rare feature of CORD and has not been described in CORD7. We report a patient who was heterozygous for the RIM1 mutation with bilateral CMO and who manifested a retinitis pigmentosa phenotype. MATERIALS AND METHODS The patient's medical notes were retrospectively reviewed over an 18-month period. Genetic testing was performed by next generation sequencing for a panel of 176 genes associated with retinal dystrophy. RESULTS A 34-year-old man presented with a 5-year history of bilateral floaters and blurred vision. Visual acuity was 20/23 and 20/33 in the right and left eyes, respectively. Optical coherence tomography scans revealed bilateral CMO. Goldmann visual field tests detected mid-peripheral ring scotomas. Electrodiagnostic testing was overall consistent with a primary photoreceptor abnormality involving both rods and cones. Subsequent genetic testing identified heterozygosity for the RIM1 c.2459G>A (Arg820His) mutation. Various treatments for CMO were trialled unsuccessfully. However, at his latest clinic appointment the CMO had partially improved following topical brinzolamide therapy. Most recent visual acuity was 20/25 in the right eye and 20/24 in the left eye. CONCLUSIONS This is the first reported case of bilateral CMO in association with the RIM1 mutation. Overall, our findings were more consistent with a phenotype of retinitis pigmentosa. This could imply that the RIM1 mutation causes diverse retinal dystrophies, or that the previously described CORD7 phenotype resulted from a different variant on the same haplotype.
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Affiliation(s)
- Alasdair N Warwick
- a Clinical Neurosciences Research Group, Clinical and Experimental Sciences, Faculty of Medicine , University of Southampton , Southampton , UK.,b Eye Unit, University Hospital Southampton NHS Foundation Trust , Southampton , UK
| | - Fatima Shawkat
- b Eye Unit, University Hospital Southampton NHS Foundation Trust , Southampton , UK
| | - Andrew J Lotery
- a Clinical Neurosciences Research Group, Clinical and Experimental Sciences, Faculty of Medicine , University of Southampton , Southampton , UK.,b Eye Unit, University Hospital Southampton NHS Foundation Trust , Southampton , UK
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