Abstract
Transplantation of oligodendrocyte progenitor cell (OPC) at the injury site is being developed as a potential therapeutic strategy for promoting remyelination and locomotor function recovery after spinal cord injury (SCI). To this end, the development of expandable and functional human OPCs is crucial for testing their efficacy in SCI. In mice and rats, the endocannabinoid signaling system is crucial for the survival, differentiation, and maturation of OPCs. Similar studies in humans are lacking currently. Endocannabinoids and exogenous cannabinoids exert their effects mainly via cannabinoid receptors (CB1R and CB2R). We demonstrated that these receptors were differentially expressed in iPSC-derived human NSCs and OPCs, and they could be activated by WIN55212-2 (WIN), a potent CB1R/CB2R agonist to upregulate the endocannabinoid signaling during glial induction. WIN primed NSCs generated more OLIG2 + glial progenitors and migratory PDGFRα + OPC in a CB1/CB2 dependent manner compared to unprimed NSCs. Furthermore, WIN-induced OPCs (WIN-OPCs) robustly differentiated into functional oligodendrocytes and myelinate in vitro and in vivo in a mouse spinal cord injury model. RNA-Seq revealed that WIN upregulated the biological process of positive regulation of oligodendrocyte differentiation. Mechanistically, WIN could act as a partial smoothed (SMO) inhibitor or activate CB1/CB2 to form heteromeric complexes with SMO leading to the inhibition of GLI1 in the Sonic hedgehog pathway. The partial and temporal inhibition of GLI1 during glial induction is shown to promote OPCs that differentiate faster than control’s. Thus, CB1R/CB2R activation results in more efficient generation of OPCs that can mature and efficiently myelinate.
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The data are available from the corresponding author on reasonable request.
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Acknowledgements
Authors acknowledge Prof. Xusheng Wang from School of Pharmaceutical Science (Shenzhen), Sun Yat-sen University, Shenzhen, China, for kindly providing the hiPSC cell line, and Dr. **aowei Li from **an University, Guangzhou, China, for guidance and help on the spinal cord injury mice models. Hong Gao would like to thank CSC scholarship for providing the opportunity to study at the University of California, Davis.
Funding
This work was funded by National Natural Science Foundation of China (Grant no. 81772449 and 81971081) and Shenzhen Science and Technology Program (Grant no. KQTD20190929173853397). We would also like to thank the partial support of Jiangxi ShuanQian Team Project #S2019CXTD2090 to Jiangxi Deshang Pharmaceutical Co., Ltd.
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H.G., Y.G., S.B. and Deng.W.B. designed experiments and worked on the manuscript writing. H.G., J.L. and Zhang. H.J. performed cell culture, qPCR, immunostaining and MACS. H.G., Zhang. H.J. and Chen. Z.L. conducted flow cytometry, SCI mice modeling, cell transplantation and TEM. H.G., J.L. and Y.G. performed RNA-Seq analysis and data interpreting. The final version of manuscript was reviewed and approved by all authors.
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Gao, H., Guo, Y., Biswas, S. et al. Promoting Oligodendrocyte Differentiation from Human Induced Pluripotent Stem Cells by Activating Endocannabinoid Signaling for Treating Spinal Cord Injury. Stem Cell Rev and Rep 18, 3033–3049 (2022). https://doi.org/10.1007/s12015-022-10405-0
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DOI: https://doi.org/10.1007/s12015-022-10405-0