Abstract
Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease characterized by motor neuron (MN) loss. Recent evidences highlight astrocytes as important players in MN death, but the mechanism-based neurotoxicity is still unknown. It is also unclear whether activation of astrocytes in ALS occurs differently in the cerebral cortex and spinal cord. We investigated glial and neuronal alterations in the cortex of SOD1G93A (mSOD1) mice in pre-symptomatic and symptomatic stages. We also characterized astrocytes isolated from the cortex of 7-day-old mSOD1 mice for their aberrancy and MN-induced degenerative effects. In the early stage, we identified a reduction of cell proliferation, NF-kB expression, and of vimentin and micro(miR)-146a expression, suggesting a restrained cortical inflammatory status. However, increased NF-kB expression, cell proliferation, and gene expression of HMGB1, connexin 43 and S100B were distinctive of the symptomatic stage, together with MN loss, downregulated unfold protein response, and decreased expression of synaptic proteins, together with that of miR-125b, miR-21, miR-146a, GFAP, and glutamate transporters. Astrocytes cultured for 13 days in vitro showed comparable NF-kB expression and cell proliferation increase, as well as similar microRNA and gene/protein expression profiles (decreased miR-21, miR-146a, GLT-1 and GFAP, and upregulated HMGB1, S100B and connexin-43), thus sustaining astrocytes as the major contributors of cortical homeostasis deregulation in the symptomatic stage. These reactive astrocytes reduced neurite length and synaptophysin expression in NSC-34/hSOD1WT MN-like cells, and induced mitochondria dysfunction, PSD-95 downregulation, metalloproteinase-9 activation, and late apoptosis in NSC-34/hSOD1G93A cells. Data indicate that astrocytes in mSOD1 mice model acquire early phenotypic aberrancies and highlight downregulated miR-146a as a biomarker and drug target in ALS.
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Abbreviations
- ALS:
-
amyotrophic lateral sclerosis
- ATF4:
-
activating transcription factor 4
- ChAT:
-
choline acetyltransferase
- CNS:
-
central nervous system
- Cx43:
-
connexin-43
- DIV:
-
days in vitro
- eIF2α:
-
eukaryotic initiation factor 2 alpha
- ER:
-
endoplasmic reticulum
- fALS:
-
familial ALS
- GFAP:
-
glial fibrillary acidic protein
- GLAST:
-
glutamate aspartate transporter
- GLT-1:
-
glutamate transporter 1
- GluT:
-
glutamate transporters
- HMGB1:
-
high mobility group box 1
- IRAK1:
-
interleukin-1 receptor-associated kinase 1
- LC3B:
-
microtubule-associated protein light chain 3
- MBP:
-
myelin basic protein
- miR:
-
microRNA
- MMP:
-
matrix metalloproteinase
- MN:
-
motor neuron
- mSOD1:
-
mutant SOD1/SOD1G93A
- NeuN:
-
neuronal nuclei antigen
- NF-kB:
-
nuclear factor kappa B
- NG2:
-
neural/glial antigen 2
- ON:
-
overnight
- PBS:
-
phosphate buffer saline
- PFA:
-
paraformaldehyde
- PN:
-
postnatal
- PSD-95:
-
post-synaptic density protein 95
- qPCR:
-
quantitative real time-transcription polymerase chain reaction
- RT:
-
room temperature
- S100B:
-
S100 calcium binding protein B
- sALS:
-
sporadic ALS
- SC:
-
spinal cord
- SOD1:
-
superoxide dismutase 1
- SYP:
-
synaptophysin
- TRAF6:
-
tumor necrosis factor receptor-associated factor 6
- WT:
-
wild-type
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Acknowledgments
CG and CC are recipients of PhD fellowships from FCT (SFRH/BD/102718/2014 and SFRH/BD/91316/2012, respectively) and ARV of a Postdoctoral grant (SFRH/BPD/76590/2011). The funding organization had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. We thank Dr. Andreia Barateiro and Dr. Ana Domingos for acquisition of brain section images in Leica DM6000 inverted Confocal Microscope at Instituto Gulbenkian de Ciência (Oeiras, Portugal).
Funding
This work was supported by the Research Grant of the Santa Casa Scientific Research Program on ALS, by Santa Casa da Misericórdia de Lisboa (SCML), Portugal, Project Ref. ELA-2015-002 (to DB), by the project PTDC/SAU-FAR/118787/2010 (to DB) and, in part, by iMed.ULisboa (UID/DTP/04138/2013) from Fundação para a Ciência e a Tecnologia (FCT).
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This study was performed in accordance with the European Community guidelines (Directives 86/609/EU and 2010/63/EU, Recommendation 2007/526/CE, European Convention for the Protection of Vertebrate Animals used for Experimental or Other Scientific Purposes ETS 123/Appendix A) and Portuguese Laws on Animal Care (Decreto-Lei 129/92, Portaria 1005/92, Portaria 466/95, Decreto-Lei 197/96, Portaria 1131/97). All the protocols used in this study were approved by the Portuguese National Authority (General Direction of Veterinary) and the Ethics Committee of the Instituto de Medicina Molecular (iMM) of the Faculty of Medicine, Universidade de Lisboa, Lisbon, Portugal.
Conflict of Interest
The authors declare that they have no conflict of interest.
Electronic supplementary material
Supplementary Figure 1
Unchanged LC3B and Beclin-1 protein expression in the cerebral cortex of mSOD1 mice indicate that the autophagy process is not affected by the disease. Cortical tissue samples were obtained from hSOD1G93A (mSOD1) and wild-type (WT) mice at 4–6 week-old (pre-symptomatic, stage 1) and 12–14 week-old (symptomatic, stage 2). Western blot analysis showing the expression levels of (a) microtubule-associated protein 1 light chain 3B (LC3B) and (b) Beclin-1. Representative results from one blot are shown. β-actin was used as a loading control. Results are represented as fold vs. WT animals in the same disease stage. Data represent mean values ± SEM from at least five independent experiments. (PNG 219 kb)
Supplementary Figure 2
Expression levels of proteins associated with oligodendrocyte progenitors and activated microglia in the cerebral cortex of mSOD1 mice are not affected by the disease, though the population of mature myelinating oligodendrocytes is reduced before disease onset. . Cortical tissue samples were obtained from hSOD1G93A (mSOD1) and wild-type (WT) mice at 4–6 week-old (pre-symptomatic, stage 1) and 12–14 week-old (symptomatic, stage 2). Western blot analysis showing the expression levels of (a) NG2 and (c) myelin basic protein (MBP). Representative results from one blot are shown. β-actin was used as a loading control. qRT-PCR gene expression analysis of (b) NG2, (d) CD11b mRNA and (e) microRNA(miR)-155 levels. Results are represented as folds vs. age-matched WT mice. Data represent mean values ± SEM from at least five independent experiments. *p < 0.05 vs. WT samples, two-tailed unpaired Student’s t-test with Welch’s correction when required. (PNG 372 kb)
Supplementary Figure 3
Astrocytes isolated from the cerebral cortex of mSOD1 mice show a predominance of cells globally presenting an atypical reactive phenotype. Astrocytes were isolated from the cortex of hSOD1G93A (mSOD1) and wild-type (WT) mice pups at 7 day-old, and cultured for 13 days in vitro. Representative fluorescence images of S100 calcium-binding protein B (S100B), the proliferation marker Ki-67, fibrillary acidic protein (GFAP), glutamate transporter 1 (GLT-1), glutamate aspartate transporter (GLAST) and, vimentin and Respective quantification based on the number of positive cells above a fluorescent signal threshold settled for each marker. For Ki-67 staining, only cells with 2 or more nuclear punctuations were considered as positive. Results are represented as folds vs. WT samples. Data represent mean values ± SEM from at least five independent experiments. *p < 0.05, **p < 0.01 and ***p < 0.001 vs. WT samples, two-tailed unpaired Student’s t-test with Welch’s correction when required. Scale bar represents 40 μm. (PNG 2150 kb)
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Gomes, C., Cunha, C., Nascimento, F. et al. Cortical Neurotoxic Astrocytes with Early ALS Pathology and miR-146a Deficit Replicate Gliosis Markers of Symptomatic SOD1G93A Mouse Model. Mol Neurobiol 56, 2137–2158 (2019). https://doi.org/10.1007/s12035-018-1220-8
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DOI: https://doi.org/10.1007/s12035-018-1220-8