Abstract
Multiple sclerosis (MS) is an autoimmune and demyelinating disease of the central nervous system (CNS) caused by CNS infiltration of peripheral immune cells, immune-mediated attack of the myelin sheath, neuroinflammation, and/or axonal/neuronal dysfunctions. Some drugs are available to cope with relapsing–remitting MS (RRMS) but there is no therapy for the primary progressive MS (PPMS). Because growing evidence supports a regulatory role of the translocator protein (TSPO) in neuroinflammatory, demyelinating, and neurodegenerative processes, we investigated the therapeutic potential of phenylindolyilglyoxylamydes (PIGAs) TSPO ligands in myelin oligodendrocyte glycoprotein (MOG)–induced experimental autoimmune encephalomyelitis (EAE) mice mimicking the human PPMS. MOG-EAE C57Bl/6-mice were treated by TSPO ligands PIGA839, PIGA1138, or the vehicle. Several methods were combined to evaluate PIGAs-TSPO ligand effects on MOG-EAE symptoms, CNS infiltration by immune cells, demyelination, and axonal damages. PIGA1138 (15 mg/kg) drastically reduced MOG-EAE mice clinical scores, ameliorated motor dysfunctions assessed with the Catwalk device, and counteracted MOG-EAE-induced demyelination by preserving Myelin basic protein (MBP) expression in the CNS. Furthermore, PIGA1138-treatment prevented EAE-evoked decreased neurofilament-200 expression in spinal and cerebellar axons. Moreover, PIGA1138 inhibited peripheral immune-CD45 + cell infiltration in the CNS, suggesting that it may control inflammatory mechanisms involved in PPMS. Concordantly, PIGA1138 enhanced anti-inflammatory interleukin-10 serum level in MOG-EAE mice. PIGA1138-treatment, which increased neurosteroid allopregnanolone production, ameliorated all pathological biomarkers, while PIGA839, unable to activate neurosteroidogenesis in vivo, exerted only moderate/partial effects in MOG-EAE mice. Altogether, our results suggest that PIGA1138-based treatment may represent an interesting possibility to be explored for the innovation of effective therapies against PPMS.
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Availability of Data and Materials
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Change history
24 January 2022
"Christine Patte-Mensah and Ayikoé-Guy Mensah-Nyagan are co-seniors." was added in print proofs.
Abbreviations
- MS:
-
Multiple sclerosis
- CNS:
-
Central nervous system
- PPMS:
-
Primary progressive multiple sclerosis
- RRMS:
-
Relapsing-remitting multiple sclerosis
- TSPO:
-
Translocator protein
- PIGAs:
-
Phenylindolyilglyoxylamydes
- MOG:
-
Myelin oligodendrocyte glycoprotein
- EAE:
-
Experimental autoimmune encephalomyelitis
- MBP:
-
Myelin basic protein
- PLP:
-
Proteolipid protein
- RT:
-
Residence time
- PBS:
-
Phosphate-buffered saline
- i.p. :
-
Intraperitoneally
- CS:
-
Clinical score
- HPC:
-
Hydroxypropyl cellulose
- PFA:
-
Paraformaldehyde
- BSA:
-
Bovine serum albumin
- NF:
-
Neurofilament
- DAPI:
-
4′,6′-Diamidino-2-phenylindole
- ROIs:
-
Regions of interest
- AU:
-
Arbitrary unit
- IL-10:
-
Interleukin 10
- ELISA:
-
Enzyme-linked immunosorbent assay
- LC/HR-MS:
-
Liquid chromatography/high-resolution-mass spectrometry
- LFB/CV:
-
Luxol fast blue/cresyl violet
- H-ESI:
-
Heated electrospray ionization
- SEM:
-
Standard error mean
- Cer:
-
Cerebellum
- CC:
-
Corpus callosum
- CTX:
-
Cortex
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Acknowledgements
The authors want to thank Beatrice Muscatello, CISUP (Centre for Instrumentation Sharing—University of Pisa), for her technical assistance during LC/HR-MS investigations.
Funding
This work was supported by recurring grants from the Institut National de la Santé et de la Recherche Médicale (INSERM, France, grant #U1119) and Université de Strasbourg (France, grant #UMR_S 1119). Partial support was provided by the Italian Ministry of Education, Universities and Research (MIUR), grant number 2017MT3993.
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Immunohistochemical experiments, ELISA, data analysis, and contribution to the manuscript draft: CT, CK, LM. Behavioral experiments, clinical scoring, data analysis, and interpretation: CC, CK, LM. TSPO ligand production and critical reading of manuscript: BC, EDP, ST. LC/HR-MS analysis: LG, CT. Study design, supervision, analysis and interpretation of data, manuscript writing, and editing: AGMN and CPM. All authors read and approved the submitted version.
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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed: Ministry of Higher Education and Research, France and CREMEAS ethical committee authorization number 9374–201605111128746-v2. This study does not contain any experiments with human participants performed by any of the authors.
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1 Biopathologie de la Myéline, Neuroprotection et Stratégies Thérapeutiques, INSERM U1119, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Bâtiment CRBS de la Faculté de Médecine, 1 rue Eugène Boeckel, 67 000 Strasbourg, France.
2 Department of Pharmacy, University of Pisa, Via Bonanno 6, 56126 Pisa, Italy.
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Christine Patte-Mensah and Ayikoé-Guy Mensah-Nyagan are co-seniors.
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Tremolanti, C., Cavallini, C., Meyer, L. et al. Translocator Protein Ligand PIGA1138 Reduces Disease Symptoms and Severity in Experimental Autoimmune Encephalomyelitis Model of Primary Progressive Multiple Sclerosis. Mol Neurobiol 59, 1744–1765 (2022). https://doi.org/10.1007/s12035-022-02737-2
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DOI: https://doi.org/10.1007/s12035-022-02737-2