Abstract
Endothelin-1 (ET-1) is a vasoactive peptide produced by activated astrocytes and microglia and is implicated in initiating and sustaining reactive gliosis in neurodegenerative diseases. We have previously suggested that ET-1 can play a role in the pathophysiology of amyotrophic lateral sclerosis (ALS). Indeed, we reported that this peptide is abundantly expressed in reactive astrocytes in the spinal cord of SOD1-G93A mice and ALS patients and exerts a toxic effect on motor neurons (MNs) in an in vitro model of mixed spinal cord cultures enriched with reactive astrocytes. Here, we explored the possible mechanisms underlying the toxic effect of ET-1 on cultured MNs. We show that ET-1 toxicity is not directly caused by oxidative stress or activation of cyclooxygenase-2 but requires the synthesis of nitric oxide and is mediated by a reduced activation of the phosphoinositide 3-kinase pathway. Furthermore, we observed that ET-1 is also toxic for microglia, although its effect on MNs is independent of the presence of this type of glial cells. Our study confirms that ET-1 may contribute to MN death and corroborates the view that the modulation of ET-1 signaling might be a therapeutic strategy to slow down MN degeneration in ALS.
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Abbreviations
- ALS:
-
Amyotrophic lateral sclerosis
- COX-2:
-
Cyclooxygenase-2
- ET-1:
-
Endothelin-1
- GFAP:
-
Glial fibrillary acid protein
- L-NNA:
-
NG-Nitro-L-arginine
- MAP-2:
-
Microtubule-associated protein 2
- MN:
-
Motor neuron
- MMP:
-
Matrix metalloproteinase
- NO:
-
Nitric oxide
- NOS:
-
Nitric oxide synthase
- eNOS:
-
Endothelial nitric oxide synthase
- iNOS:
-
Inducible nitric oxide synthase
- nNOS:
-
Neuronal nitric oxide synthase
- PI3K:
-
Phosphoinositide 3-kinase
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Acknowledgements
The authors would like to thank Annalisa Scuderi and Neda Zeinali, for their technical support in performing experimental work, and Meredith Graham for helping with image analysis. AS is a student of the University of Catania under an undergraduate training program. NZ and MG are students of the University of Cardiff who are attending the Institute of Neurological Sciences of CNR in Catania for professional training supported by the undergraduate Erasmus program.
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This study was supported by CNR (ME P02.011, DSB.AD009.001.018) and IRCCS Oasi Maria SS (Troina, EN). ER was supported by Programma Operativo Obiettivo Convergenza 2007–2013, FSE, Regione Siciliana, avviso n. 1 2012.
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The authors declare that they have no conflicts of interest.
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Online Resource 1
Activation of COX-2 is not involved in ET-1 toxic effect. Percentage of surviving MNs after a treatment with ET-1 (100 nM) with/without DuP 697 (10 nM) for 48 h at 13–14 DIV. Data represent mean ± SEM of data from four experiments, each performed in quadruplicate. ***p < 0.001 versus control by one-way ANOVA followed by post hoc Holm–Sidak method; +++p < 0.001 versus DuP 697 by one-way ANOVA followed by post hoc Holm–Sidak method; ###p < 0.001 versus ET-1 by one-way ANOVA followed by post hoc Holm–Sidak method. (GIF 24 kb)
Online Resource 2
Akt is expressed in neurons and glial cells. Double immunocytochemistry experiments performed with SMI32, anti-MAP-2, anti-GFAP, and anti-Akt antibodies in mixed spinal cord cultures at 15 DIV. Scale bar = 20 μm. (GIF 112 kb)
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D’Antoni, S., Ranno, E., Spatuzza, M. et al. Endothelin-1 Induces Degeneration of Cultured Motor Neurons Through a Mechanism Mediated by Nitric Oxide and PI3K/Akt Pathway. Neurotox Res 32, 58–70 (2017). https://doi.org/10.1007/s12640-017-9711-3
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DOI: https://doi.org/10.1007/s12640-017-9711-3