Abstract
Aberrant endocannabinoid signaling accompanies several neurodegenerative disorders, including multiple sclerosis. Here, we report altered endocannabinoid signaling in X-linked adrenoleukodystrophy (X-ALD), a rare neurometabolic demyelinating syndrome caused by malfunction of the peroxisomal ABCD1 transporter, resulting in the accumulation of very long-chain fatty acids (VLCFAs). We found abnormal levels of cannabinoid receptor 2 (CB2r) and related endocannabinoid enzymes in the brain and peripheral blood mononuclear cells (PBMCs) of X-ALD patients and in the spinal cord of a murine model of X-ALD. Preclinical treatment with a selective agonist of CB2r (JWH133) halted axonal degeneration and associated locomotor deficits, along with normalization of microgliosis. Moreover, the drug improved the main metabolic disturbances underlying this model, particularly in redox and lipid homeostatic pathways, including increased lipid droplets in motor neurons, through the modulation of the GSK-3β/NRF2 axis. JWH133 inhibited Reactive Oxygen Species elicited by excess VLCFAs in primary microglial cultures of Abcd1-null mice. Furthermore, we uncovered intertwined redox and CB2r signaling in the murine spinal cords and in patient PBMC samples obtained from a phase II clinical trial with antioxidants (NCT01495260). These findings highlight CB2r signaling as a potential therapeutic target for X-ALD and perhaps other neurodegenerative disorders that present with dysregulated redox and lipid homeostasis.
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Acknowledgements
We are indebted to patients and families and the ELA-España for their collaboration. We are thankful to the NIH NeuroBioBank for supplying the case material used for human studies. We thank Jordi Riera, Laia Grau, and Juan-Jose Martínez (Neurometabolic Diseases Laboratory) for technical assistance. This study was funded by the Institute of Health Carlos III through projects [PI19/01008] to SF and [PI20/00759] to AP (co-funded by the European Regional Development Fund, ERDF, a way to build Europe), Miguel Servet program [CPII16/00016] to SF and [PFIS, FI18/00141] to LPS (co-funded by the European Social Fund, ESF investing in your future). This study was also funded by grants from the Spanish Ministry of Health, Social Services and Equality (EC10-137), the Autonomous Government of Catalonia [2017SGR1206], the Hesperia Foundation, CERTIS Obres i Serveis, and the Crowd funding Campaign Arnau’97 to AP. JP was a predoctoral fellow of IDIBELL. The Center for Biomedical Research on Rare Diseases (CIBERER), an initiative of the Institute of Health Carlos III, funded the position of MR. Locomotor experiments were performed by the SEFALer unit F5 led by AP, which belongs to the CIBERER structure. We thank the CERCA Program/Generalitat de Catalunya for institutional support.
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AP and SF conceived the study, oversaw the project and acquired funding. JP, LG, LPS, APa, MR, NYC, CG, and JB performed the experiments. JP, LG, LPS, APa, MR, NYC, EA, JB, RP, MPO, IF, RT, AP, and SF designed and/or interpreted aspects of the different experiments. AP and CC were Principal Investigators of the clinical trial (NCT01495260). JP, AP, and SF wrote the original draft. JP, AP, and SF reviewed and edited the manuscript. All the coauthors provided input on the manuscript.
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Parameswaran, J., Goicoechea, L., Planas-Serra, L. et al. Activating cannabinoid receptor 2 preserves axonal health through GSK-3β/NRF2 axis in adrenoleukodystrophy. Acta Neuropathol 144, 241–258 (2022). https://doi.org/10.1007/s00401-022-02451-2
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DOI: https://doi.org/10.1007/s00401-022-02451-2