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Heir R, Abbasi Z, Komal P, Altimimi HF, Franquin M, Moschou D, Chambon J, Stellwagen D. Astrocytes Are the Source of TNF Mediating Homeostatic Synaptic Plasticity. J Neurosci 2024; 44:e2278222024. [PMID: 38395613 PMCID: PMC10993029 DOI: 10.1523/jneurosci.2278-22.2024] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 02/05/2024] [Accepted: 02/06/2024] [Indexed: 02/25/2024] Open
Abstract
Tumor necrosis factor α (TNF) mediates homeostatic synaptic plasticity (HSP) in response to chronic activity blockade, and prior work has established that it is released from glia. Here we demonstrate that astrocytes are the necessary source of TNF during HSP. Hippocampal cultures from rats of both sexes depleted of microglia still will increase TNF levels following activity deprivation and still express TTX-driven HSP. Slice cultures from mice of either sex with a conditional deletion of TNF from microglia also express HSP, but critically, slice cultures with a conditional deletion of TNF from astrocytes do not. In astrocytes, glutamate signaling is sufficient to reduce NFκB signaling and TNF mRNA levels. Further, chronic TTX treatment increases TNF in an NFκB-dependent manner, although NFκB signaling is dispensable for the neuronal response to TTX-driven HSP. Thus, astrocytes can sense neuronal activity through glutamate spillover and increase TNF production when activity falls, to drive HSP through the production of TNF.
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Affiliation(s)
- Renu Heir
- Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, Quebec H3G 1A4, Canada
| | - Zahra Abbasi
- Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, Quebec H3G 1A4, Canada
| | - Pragya Komal
- Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, Quebec H3G 1A4, Canada
| | - Haider F Altimimi
- Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, Quebec H3G 1A4, Canada
| | - Marie Franquin
- Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, Quebec H3G 1A4, Canada
| | - Dionysia Moschou
- Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, Quebec H3G 1A4, Canada
| | - Julien Chambon
- Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, Quebec H3G 1A4, Canada
| | - David Stellwagen
- Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, Quebec H3G 1A4, Canada
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Kemp GM, Altimimi HF, Nho Y, Heir R, Klyczek A, Stellwagen D. Sustained TNF signaling is required for the synaptic and anxiety-like behavioral response to acute stress. Mol Psychiatry 2022; 27:4474-4484. [PMID: 36104437 PMCID: PMC9734040 DOI: 10.1038/s41380-022-01737-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 08/03/2022] [Accepted: 08/09/2022] [Indexed: 12/14/2022]
Abstract
Acute stress triggers plasticity of forebrain synapses as well as behavioral changes. Here we reveal that Tumor Necrosis Factor α (TNF) is a required downstream mediator of the stress response in mice, necessary for stress-induced synaptic potentiation in the ventral hippocampus and for an increase in anxiety-like behaviour. Acute stress is sufficient to activate microglia, triggering the long-term release of TNF. Critically, on-going TNF signaling specifically in the ventral hippocampus is necessary to sustain both the stress-induced synaptic and behavioral changes, as these could be reversed hours after induction by antagonizing TNF signaling. This demonstrates that TNF maintains the synaptic and behavioral stress response in vivo, making TNF a potential novel therapeutic target for stress disorders.
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Affiliation(s)
- Gina M. Kemp
- grid.63984.300000 0000 9064 4811Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, QC Canada
| | - Haider F. Altimimi
- grid.63984.300000 0000 9064 4811Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, QC Canada
| | - Yoonmi Nho
- grid.63984.300000 0000 9064 4811Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, QC Canada
| | - Renu Heir
- grid.63984.300000 0000 9064 4811Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, QC Canada
| | - Adam Klyczek
- grid.63984.300000 0000 9064 4811Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, QC Canada
| | - David Stellwagen
- Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, QC, Canada.
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Abstract
Since it was first described almost 30 years ago, homeostatic synaptic plasticity (HSP) has been hypothesized to play a key role in maintaining neuronal circuit function in both developing and adult animals. While well characterized in vitro, determining the in vivo roles of this form of plasticity remains challenging. Since the discovery that the pro-inflammatory cytokine tumor necrosis factor-α (TNF-α) mediates some forms of HSP, it has been possible to probe some of the in vivo contribution of TNF-mediated HSP. Work from our lab and others has found roles for TNF-HSP in a variety of functions, including the developmental plasticity of sensory systems, models of drug addiction, and the response to psychiatric drugs.
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Affiliation(s)
- Renu Heir
- Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, QC, Canada
| | - David Stellwagen
- Department of Neurology and Neurosurgery, Centre for Research in Neuroscience, Research Institute of the McGill University Health Center, Montréal, QC, Canada
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Duseja R, Heir R, Lewitus GM, Altimimi HF, Stellwagen D. Astrocytic TNFα regulates the behavioral response to antidepressants. Brain Behav Immun 2015; 44:187-94. [PMID: 25300923 DOI: 10.1016/j.bbi.2014.09.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 09/17/2014] [Accepted: 09/24/2014] [Indexed: 12/22/2022] Open
Abstract
Recent studies have suggested that cytokines, and in particular tumor necrosis factor alpha (TNFα), have a role in modulating antidepressant efficacy. To directly test this idea, we compared the response of TNFα(-/-) mice and astrocyte-specific TNFα(-/-) mice to the antidepressants fluoxetine and desipramine. Using standard behavior models for measuring antidepressant efficacy, the forced swim test (FST) and tail suspension test (TST), we determined that TNFα(-/-) mice were essentially normal in basal behavior in the FST and TST. However, TNFα(-/-) mice showed no behavioral response to a standard dose of chronic antidepressant treatment, in sharp contrast to wildtype mice. Similar results were seen with acute antidepressant treatment, but TNFα(-/-) mice did respond to a very high-dose acute antidepressant treatment. We also assessed in vitro and in vivo effects of fluoxetine on TNFα expression. Glia responded to serotonin in vitro and fluoxetine in vivo by upregulating TNFα mRNA. Consistent with this source of TNFα, mice with an astrocyte-specific deletion of TNFα also did not respond to standard chronic antidepressant treatment. These data suggest that astrocytic TNFα is important to the sensitivity of the behavioral response to administration of antidepressants.
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Affiliation(s)
- Rachna Duseja
- Centre for Research in Neuroscience, Dept of Neurology and Neurosurgery, McGill University Health Centre, Montreal, QC H3G 1A4, Canada
| | - Renu Heir
- Centre for Research in Neuroscience, Dept of Neurology and Neurosurgery, McGill University Health Centre, Montreal, QC H3G 1A4, Canada
| | - Gil M Lewitus
- Centre for Research in Neuroscience, Dept of Neurology and Neurosurgery, McGill University Health Centre, Montreal, QC H3G 1A4, Canada
| | - Haider F Altimimi
- Centre for Research in Neuroscience, Dept of Neurology and Neurosurgery, McGill University Health Centre, Montreal, QC H3G 1A4, Canada
| | - David Stellwagen
- Centre for Research in Neuroscience, Dept of Neurology and Neurosurgery, McGill University Health Centre, Montreal, QC H3G 1A4, Canada.
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Heir R, Ablasou C, Dumontier E, Elliott M, Fagotto-Kaufmann C, Bedford FK. The UBL domain of PLIC-1 regulates aggresome formation. EMBO Rep 2006; 7:1252-8. [PMID: 17082820 PMCID: PMC1794689 DOI: 10.1038/sj.embor.7400823] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2005] [Revised: 09/04/2006] [Accepted: 09/04/2006] [Indexed: 12/25/2022] Open
Abstract
Defects in protein folding and the proteasomal pathway have been linked with many neurodegenerative diseases. PLIC-1 (protein linking IAP to the cytoskeleton) is a ubiquitin-like protein that binds to the ubiquitin-interacting motif (UIM) of the proteasomal subunit S5a. Here, we show that PLIC-1 also binds to the UIM proteins ataxin 3--a deubiquitinating enzyme--HSJ1a--a co-chaperone--and EPS15 (epidermal growth factor substrate 15)--an endocytic protein. Using a polyglutamine (polyQ) disease model, we found that both endogenous PLIC-1 and EPS15 localize to perinuclear aggresomes, and that polyQ enhances their in vivo interaction. We show that knockdown of PLIC-1 and EPS15 by RNA interference reduces aggresome formation. In addition, PLIC-1(DeltaUBL) functions as a dominant-negative mutant, blocking both polyQ transport to aggresomes and the association of EPS15 with dispersed aggregates. We also show that PLIC-1 is upregulated by arsenite-induced protein misfolding. These results indicate a role for PLIC-1 in the protein aggregation-stress pathway, and we propose a novel function for the ubiquitin-like (UBL) domain--by means of UBL-UIM interactions--in transport to aggresomes.
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Affiliation(s)
- Renu Heir
- Department of Anatomy and Cell Biology, McGill University, 3640 University Street, Montreal, Quebec H3A2B2, Canada
| | - Celine Ablasou
- Laboratoire d'Immunologie Equipe d'Accueil 2686, Faculte de Medecine, Pole Recherche, 1 Place de Verdun, 59045 Lille, France
| | - Emilie Dumontier
- Department of Anatomy and Cell Biology, McGill University, 3640 University Street, Montreal, Quebec H3A2B2, Canada
| | - Meghan Elliott
- Department of Anatomy and Cell Biology, McGill University, 3640 University Street, Montreal, Quebec H3A2B2, Canada
| | - Christine Fagotto-Kaufmann
- Department of Anatomy and Cell Biology, McGill University, 3640 University Street, Montreal, Quebec H3A2B2, Canada
| | - Fiona K Bedford
- Department of Anatomy and Cell Biology, McGill University, 3640 University Street, Montreal, Quebec H3A2B2, Canada
- Tel: +1 514 398 1426; Fax: +1 514 398 5047; E-mail:
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