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Matias I, Diniz LP, Araujo APB, Damico IV, de Moura P, Cabral-Miranda F, Diniz F, Parmeggiani B, de Mello Coelho V, Leite REP, Suemoto CK, Ferreira GC, Kubrusly RCC, Gomes FCA. Age-Associated Upregulation of Glutamate Transporters and Glutamine Synthetase in Senescent Astrocytes In Vitro and in the Mouse and Human Hippocampus. ASN Neuro 2023; 15:17590914231157974. [PMID: 36815213 PMCID: PMC9950616 DOI: 10.1177/17590914231157974] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023] Open
Abstract
Aging is marked by complex and progressive physiological changes, including in the glutamatergic system, that lead to a decline of brain function. Increased content of senescent cells in the brain, such as glial cells, has been reported to impact cognition both in animal models and human tissue during normal aging and in the context of neurodegenerative disease. Changes in the glutamatergic synaptic activity rely on the glutamate-glutamine cycle, in which astrocytes handle glutamate taken up from synapses and provide glutamine for neurons, thus maintaining excitatory neurotransmission. However, the mechanisms of glutamate homeostasis in brain aging are still poorly understood. Herein, we showed that mouse senescent astrocytes in vitro undergo upregulation of GLT-1, GLAST, and glutamine synthetase (GS), along with the increased enzymatic activity of GS and [3H]-D-aspartate uptake. Furthermore, we observed higher levels of GS and increased [3H]-D-aspartate uptake in the hippocampus of aged mice, although the activity of GS was similar between young and old mice. Analysis of a previously available RNAseq dataset of mice at different ages revealed upregulation of GLAST and GS mRNA levels in hippocampal astrocytes during aging. Corroborating these rodent data, we showed an increased number of GS + cells, and GS and GLT-1 levels/intensity in the hippocampus of elderly humans. Our data suggest that aged astrocytes undergo molecular and functional changes that control glutamate-glutamine homeostasis upon brain aging.
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Affiliation(s)
- Isadora Matias
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de
Janeiro, Rio de Janeiro, Brasil, Isadora Matias, Instituto de Ciências
Biomédicas, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde,
Bloco F, Ilha do Fundão, 21941-902 - Rio de Janeiro, RJ, Brasil.
| | - Luan Pereira Diniz
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de
Janeiro, Rio de Janeiro, Brasil
| | - Ana Paula Bergamo Araujo
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de
Janeiro, Rio de Janeiro, Brasil
| | - Isabella Vivarini Damico
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de
Janeiro, Rio de Janeiro, Brasil
| | - Pâmella de Moura
- Instituto Biomédico, Universidade Federal
Fluminense, Niterói, Brasil
| | - Felipe Cabral-Miranda
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de
Janeiro, Rio de Janeiro, Brasil
| | - Fabiola Diniz
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de
Janeiro, Rio de Janeiro, Brasil,Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de
Janeiro, Rio de Janeiro, Brasil
| | - Belisa Parmeggiani
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de
Janeiro, Rio de Janeiro, Brasil
| | - Valeria de Mello Coelho
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de
Janeiro, Rio de Janeiro, Brasil
| | - Renata E. P. Leite
- Biobanco para Estudos em Envelhecimento, Faculdade de Medicina da Universidade de
São Paulo, São Paulo, Brasil,Divisão de Geriatria, Faculdade de Medicina da Universidade de São
Paulo, São Paulo, Brasil
| | - Claudia K. Suemoto
- Divisão de Geriatria, Faculdade de Medicina da Universidade de São
Paulo, São Paulo, Brasil
| | - Gustavo Costa Ferreira
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de
Janeiro, Rio de Janeiro, Brasil
| | | | - Flávia Carvalho Alcantara Gomes
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de
Janeiro, Rio de Janeiro, Brasil,Flávia Carvalho Alcantara Gomes. Instituto
de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Centro de
Ciências da Saúde, Bloco F, Ilha do Fundão, 21941-902 - Rio de Janeiro, RJ,
Brasil.
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Matias I, Diniz LP, Damico IV, Araujo APB, Neves LDS, Vargas G, Leite REP, Suemoto CK, Nitrini R, Jacob‐Filho W, Grinberg LT, Hol EM, Middeldorp J, Gomes FCA. Loss of lamin-B1 and defective nuclear morphology are hallmarks of astrocyte senescence in vitro and in the aging human hippocampus. Aging Cell 2022; 21:e13521. [PMID: 34894056 PMCID: PMC8761005 DOI: 10.1111/acel.13521] [Citation(s) in RCA: 43] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 11/06/2021] [Accepted: 11/10/2021] [Indexed: 12/13/2022] Open
Abstract
The increase in senescent cells in tissues, including the brain, is a general feature of normal aging and age-related pathologies. Senescent cells exhibit a specific phenotype, which includes an altered nuclear morphology and transcriptomic changes. Astrocytes undergo senescence in vitro and in age-associated neurodegenerative diseases, but little is known about whether this process also occurs in physiological aging, as well as its functional implication. Here, we investigated astrocyte senescence in vitro, in old mouse brains, and in post-mortem human brain tissue of elderly. We identified a significant loss of lamin-B1, a major component of the nuclear lamina, as a hallmark of senescent astrocytes. We showed a severe reduction of lamin-B1 in the dentate gyrus of aged mice, including in hippocampal astrocytes, and in the granular cell layer of the hippocampus of post-mortem human tissue from non-demented elderly. The lamin-B1 reduction was associated with nuclear deformations, represented by an increased incidence of invaginated nuclei and loss of nuclear circularity in senescent astrocytes in vitro and in the aging human hippocampus. We also found differences in lamin-B1 levels and astrocyte nuclear morphology between the granular cell layer and polymorphic layer in the elderly human hippocampus, suggesting an intra-regional-dependent aging response of human astrocytes. Moreover, we described senescence-associated impaired neuritogenic and synaptogenic capacity of mouse astrocytes. Our findings show that reduction of lamin-B1 is a conserved feature of hippocampal cells aging, including astrocytes, and shed light on significant defects in nuclear lamina structure which may contribute to astrocyte dysfunctions during aging.
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Affiliation(s)
- Isadora Matias
- Institute of Biomedical SciencesFederal University of Rio de JaneiroRio de JaneiroBrazil
| | - Luan Pereira Diniz
- Institute of Biomedical SciencesFederal University of Rio de JaneiroRio de JaneiroBrazil
| | | | | | - Laís da Silva Neves
- Institute of Biomedical SciencesFederal University of Rio de JaneiroRio de JaneiroBrazil
| | - Gabriele Vargas
- Institute of Biomedical SciencesFederal University of Rio de JaneiroRio de JaneiroBrazil
| | - Renata E. P. Leite
- Brazilian Aging Brain Study GroupUniversity of São Paulo Medical SchoolSão PauloBrazil
- Division of GeriatricsUniversity of São Paulo Medical SchoolSão PauloBrazil
| | - Claudia K. Suemoto
- Brazilian Aging Brain Study GroupUniversity of São Paulo Medical SchoolSão PauloBrazil
- Division of GeriatricsUniversity of São Paulo Medical SchoolSão PauloBrazil
| | - Ricardo Nitrini
- Brazilian Aging Brain Study GroupUniversity of São Paulo Medical SchoolSão PauloBrazil
| | - Wilson Jacob‐Filho
- Brazilian Aging Brain Study GroupUniversity of São Paulo Medical SchoolSão PauloBrazil
- Division of GeriatricsUniversity of São Paulo Medical SchoolSão PauloBrazil
| | - Lea T. Grinberg
- Brazilian Aging Brain Study GroupUniversity of São Paulo Medical SchoolSão PauloBrazil
- Department of Neurology, Memory and Aging CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of PathologyUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Elly M. Hol
- Department of Translational NeuroscienceUniversity Medical Center Utrecht Brain CenterUtrecht UniversityUtrechtThe Netherlands
| | - Jinte Middeldorp
- Department of Translational NeuroscienceUniversity Medical Center Utrecht Brain CenterUtrecht UniversityUtrechtThe Netherlands
- Department of ImmunobiologyBiomedical Primate Research CenterRijswijkThe Netherlands
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Buosi AS, Matias I, Araujo APB, Batista C, Gomes FCA. Heterogeneity in Synaptogenic Profile of Astrocytes from Different Brain Regions. Mol Neurobiol 2017; 55:751-762. [PMID: 28050794 DOI: 10.1007/s12035-016-0343-z] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [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: 08/23/2016] [Accepted: 12/02/2016] [Indexed: 12/13/2022]
Abstract
Astrocytes, the most abundant glial cells in the central nervous system (CNS), comprise a heterogeneous population of cells. However, how this heterogeneity impacts their function within brain homeostasis and response to injury and disease is still largely unknown. Recently, astrocytes have been recognized as important regulators of synapse formation and maturation. Here, we analyzed the synaptogenic property of astrocytes from different regions of the CNS. The effect of conditioned medium derived from astrocytes (astrocyte-conditioned medium (ACM)) from cerebral cortex, hippocampus, midbrain and cerebellum, in synapse formation, was evaluated. Synapse formation was analyzed by quantification of pre- and postsynaptic proteins, synaptophysin, and postsynaptic density protein 95 (PSD-95). ACM from the four regions increased significantly the number of synaptophysin/PSD-95 puncta on neurons from the same and different brain regions. Differences on astrocytic synaptogenic potential between the regions were observed according to ACM protein concentration. Thus, cerebellar astrocytes have higher synaptogenic effect when ACM is less concentrated. Also, heterotypical co-culture assays revealed that neurons from cerebral cortex and midbrain equally respond to ACM, indicating that differences in synapse effect are unlike to be neuron-autonomous. The expression profile of the synaptogenic molecules secreted by astrocytes from distinct brain regions was analyzed by qPCR. Gene expression of glypicans 4 and 6, hevin, and secreted protein-acidic and rich in cysteine (SPARC) greatly varies between astrocytes from different brain regions. Furthermore, in vivo analysis of hevin protein confirmed that variance. These findings highlight the heterogeneity of astrocytes and suggest that their synaptogenic potential may be different in each brain region, mainly due to distinct gene expression profiles.
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Affiliation(s)
- Andrea Schmidt Buosi
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, 21941-902, Brazil
| | - Isadora Matias
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, 21941-902, Brazil
| | - Ana Paula Bergamo Araujo
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, 21941-902, Brazil
| | - Carolina Batista
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, 21941-902, Brazil
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