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Van Berkel AA, Koopmans F, Gonzalez-Lozano MA, Lammertse HCA, Feringa F, Bryois J, Sullivan PF, Smit AB, Toonen RF, Verhage M. Dysregulation of synaptic and developmental transcriptomic/proteomic profiles upon depletion of MUNC18-1. eNeuro 2022; 9:ENEURO.0186-22.2022. [PMID: 36257704 PMCID: PMC9668351 DOI: 10.1523/eneuro.0186-22.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 06/27/2022] [Accepted: 07/14/2022] [Indexed: 11/23/2022] Open
Abstract
Absence of presynaptic protein MUNC18-1 (gene: Stxbp1) leads to neuronal cell death at an immature stage before synapse formation. Here, we performed transcriptomic and proteomic profiling of immature Stxbp1 knockout (KO) cells to discover which cellular processes depend on MUNC18-1. Hippocampi of Stxbp1 KO mice showed cell-type specific dysregulation of 2123 transcripts primarily related to synaptic transmission and immune response. To further investigate direct, neuron-specific effects of MUNC18-1 depletion, a proteomic screen was performed on murine neuronal cultures at two developmental timepoints prior to onset of neuron degeneration. 399 proteins were differentially expressed, which were primarily involved in synaptic function (especially synaptic vesicle exocytosis) and neuron development. We further show that many of the downregulated proteins upon loss of MUNC18-1 are normally upregulated during this developmental stage. Thus, absence of MUNC18-1 extensively dysregulates the transcriptome and proteome, primarily affecting synaptic and developmental profiles. Lack of synaptic activity is unlikely to underlie these effects, as the changes were observed in immature neurons without functional synapses, and minimal overlap was found to activity-dependent proteins. We hypothesize that presence of MUNC18-1 is essential to advance neuron development, serving as a 'checkpoint' for neurons to initiate cell death in its absence.Significance StatementPresynaptic protein MUNC18-1 is essential for neuronal functioning. Pathogenic variants in its gene, STXBP1, are among the most common found in patients with developmental delay and epilepsy. To discern the pathogenesis in these patients, a thorough understanding of MUNC18-1's function in neurons is required. Here, we show that loss of MUNC18-1 results in extensive dysregulation of synaptic and developmental proteins in immature neurons before synapse formation. Many of the downregulated proteins are normally upregulated during this developmental stage. This indicates that MUNC18-1 is a critical regulator of neuronal development, which could play an important role in the pathogenesis of STXBP1 variant carriers.
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Affiliation(s)
- A A Van Berkel
- Dept. Functional Genomics, CNCR, VU University Amsterdam, 1081 HV Amsterdam, The Netherlands
- Functional Genomics, Department of Human Genetics, CNCR, Amsterdam UMC, 1081 HV Amsterdam, The Netherlands
| | - F Koopmans
- Dept. Functional Genomics, CNCR, VU University Amsterdam, 1081 HV Amsterdam, The Netherlands
- Dept. Molecular & Cellular Neurobiology, CNCR, VU University Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - M A Gonzalez-Lozano
- Dept. Molecular & Cellular Neurobiology, CNCR, VU University Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - H C A Lammertse
- Dept. Functional Genomics, CNCR, VU University Amsterdam, 1081 HV Amsterdam, The Netherlands
- Functional Genomics, Department of Human Genetics, CNCR, Amsterdam UMC, 1081 HV Amsterdam, The Netherlands
| | - F Feringa
- Functional Genomics, Department of Human Genetics, CNCR, Amsterdam UMC, 1081 HV Amsterdam, The Netherlands
| | - J Bryois
- Karolinska Institutet, Department of Medical Epidemiology and Biostatistics, Nobels vag 12A, 171 77 Stockholm, Sweden
| | - P F Sullivan
- UNC Center for Psychiatric Genomics, University of North Carolina at Chapel Hill, 101 Manning Drive, Chapel Hill, NC 27599-7160, USA
- Karolinska Institutet, Department of Medical Epidemiology and Biostatistics, Nobels vag 12A, 171 77 Stockholm, Sweden
| | - A B Smit
- Dept. Molecular & Cellular Neurobiology, CNCR, VU University Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - R F Toonen
- Dept. Functional Genomics, CNCR, VU University Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - M Verhage
- Dept. Functional Genomics, CNCR, VU University Amsterdam, 1081 HV Amsterdam, The Netherlands
- Functional Genomics, Department of Human Genetics, CNCR, Amsterdam UMC, 1081 HV Amsterdam, The Netherlands
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Honda T, Inui M. PDZRN3 protects against apoptosis in myoblasts by maintaining cyclin A2 expression. Sci Rep 2020; 10:1140. [PMID: 31980707 PMCID: PMC6981127 DOI: 10.1038/s41598-020-58116-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 01/07/2020] [Indexed: 11/28/2022] Open
Abstract
PDZRN3 is a PDZ domain-containing RING-finger family protein that functions in various developmental processes. We previously showed that expression of PDZRN3 is induced together with that of MyoD during the early phase of skeletal muscle regeneration in vivo. We here show that PDZRN3 suppresses apoptosis and promotes proliferation in myoblasts in a manner dependent on cyclin A2. Depletion of PDZRN3 in mouse C2C12 myoblasts by RNA interference reduced the proportion of Ki-67-positive cells and the level of Akt phosphorylation, implicating PDZRN3 in regulation of both cell proliferation and apoptosis. Exposure of C2C12 cells as well as of C3H10T1/2 mesenchymal stem cells and NIH-3T3 fibroblasts to various inducers of apoptosis including serum deprivation resulted in a greater increase in the amount of cleaved caspase-3 in PDZRN3-depleted cells than in control cells. The abundance of cyclin A2 was reduced in PDZRN3-depleted C2C12 myoblasts, as was that of Mre11, which contributes to the repair of DNA damage. Overexpression of cyclin A2 restored the expression of Mre11 and Ki-67 as well as attenuated caspase-3 cleavage in PDZRN3-depleted cells deprived of serum. These results indicate that PDZRN3 suppresses apoptosis and promotes proliferation in myoblasts and other cell types by maintaining cyclin A2 expression.
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Affiliation(s)
- Takeshi Honda
- Department of Pharmacology, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi, 755-8505, Japan
| | - Makoto Inui
- Department of Pharmacology, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi, 755-8505, Japan.
- YIC Rehabilitation College, 4-11-1 Nishiube-Minami, Ube, Yamaguchi, 759-0208, Japan.
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Grube L, Dellen R, Kruse F, Schwender H, Stühler K, Poschmann G. Mining the Secretome of C2C12 Muscle Cells: Data Dependent Experimental Approach To Analyze Protein Secretion Using Label-Free Quantification and Peptide Based Analysis. J Proteome Res 2018; 17:879-890. [DOI: 10.1021/acs.jproteome.7b00684] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Leonie Grube
- Molecular
Proteomics Laboratory, Biomedical Research Centre (BMFZ), Heinrich-Heine-University, Düsseldorf 40225, Germany
| | - Rafael Dellen
- Mathematical
Institute, Heinrich-Heine-University, Düsseldorf 40225, Germany
- Center for
Bioinformatics and Biostatistics, Biomedical Research Centre Heinrich-Heine-University, Düsseldorf 40225, Germany
| | - Fabian Kruse
- Molecular
Proteomics Laboratory, Biomedical Research Centre (BMFZ), Heinrich-Heine-University, Düsseldorf 40225, Germany
| | - Holger Schwender
- Mathematical
Institute, Heinrich-Heine-University, Düsseldorf 40225, Germany
- Center for
Bioinformatics and Biostatistics, Biomedical Research Centre Heinrich-Heine-University, Düsseldorf 40225, Germany
| | - Kai Stühler
- Molecular
Proteomics Laboratory, Biomedical Research Centre (BMFZ), Heinrich-Heine-University, Düsseldorf 40225, Germany
- Institute
for Molecular Medicine, University Hospital Düsseldorf, Düsseldorf 40225, Germany
| | - Gereon Poschmann
- Molecular
Proteomics Laboratory, Biomedical Research Centre (BMFZ), Heinrich-Heine-University, Düsseldorf 40225, Germany
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Li H, Ma Y, Xu W, Chen H, Day L. MFG-E8 protein promotes C2C12myogenic differentiation by enhancing PI3K/Akt signaling. NEW J CHEM 2017. [DOI: 10.1039/c7nj02216f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The effect of MFG-E8 on C2C12cell differentiation was analysed by immunocytochemistry, qRT-PCR and Western blot.
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Affiliation(s)
- He Li
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150090
- P. R. China
| | - Ying Ma
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150090
- P. R. China
| | - Weili Xu
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150090
- P. R. China
| | - Haoran Chen
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150090
- P. R. China
| | - Li Day
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150090
- P. R. China
- AgResearch Limited
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