Abstract
Olfactory ensheathing cell (OEC) transplantation emerged some years ago as a promising therapeutic strategy to repair injured spinal cord. However, inhibitory molecules are present for long periods of time in lesioned spinal cord, inhibiting both OEC migration and axonal regrowth. Two families of these molecules, chondroitin sulphate proteoglycans (CSPG) and myelin-derived inhibitors (MAIs), are able to trigger inhibitory responses in lesioned axons. Mounting evidence suggests that OEC migration is inhibited by myelin. Here we demonstrate that OEC migration is largely inhibited by CSPGs and that inhibition can be overcome by the bacterial enzyme Chondroitinase ABC. In parallel, we have generated a stable OEC cell line overexpressing the Nogo receptor (NgR) ectodomain to reduce MAI-associated inhibition in vitro and in vivo. Results indicate that engineered cells migrate longer distances than unmodified OECs over myelin or oligodendrocyte-myelin glycoprotein (OMgp)-coated substrates. In addition, they also show improved migration in lesioned spinal cord. Our results provide new insights toward the improvement of the mechanisms of action and optimization of OEC-based cell therapy for spinal cord lesion.
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Abbreviations
- CGN:
-
Cerebellar granule neurons
- ChABC:
-
Chondroitinase ABC
- CNS:
-
Central nervous system
- CSPG:
-
Chondroitin sulphate proteoglycan
- eGFP:
-
Enhanced green fluorescence protein
- FTTM:
-
Fourier transform traction microscopy
- GDNF:
-
Glial-derived neurotrophic factor
- GFAP:
-
Glial fibrillary acidic protein
- HRP:
-
Horseradish peroxidase
- MAIs:
-
Myelin-derived molecules
- NgR:
-
Nogo receptor
- OEC:
-
Olfactory ensheathing cell
- OMgp:
-
Oligodendrocyte-myelin glycoprotein
- SCI:
-
Spinal cord injury
- TFM:
-
Traction force microscopy
- TUJ-1:
-
β3-Tubulin
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Acknowledgments
The authors thank Tom Yohannan for editorial advice and Oscar Castaño, Miguel Ángel Mateos-Timoneda and E. Engel for helping in S.E.M studies and offering comments on the manuscript. We also thank M. Segura and M. Morell for technical assistance, and members of the Del Río, Samitier and Trepat laboratories for stimulating discussions and ideas. This research was supported by the Spanish Ministry of Science and Innovation (BFU2012-32617), the Generalitat de Catalunya (SGR2014-1218), La Caixa Obra Social Foundation, and the Basque Foundation of Health and Innovation Research (BIO12/AL/004) to JADR. RG was supported by Fondo de Investigaciones Sanitarias (PI11-00075) and work in FW’s lab was supported by grants from the Dirección General de Ciencia y Tecnologia-DGCYT-(SAF2012-39148-C03-01), and EU-FP7-2009-(CT222887), as well as an institutional grant from the ‘Fundación Areces’. Work at XN’s lab was supported by grants from the Spanish Ministry of Science and Innovation (SAF2009-12495), and funds from CIBERNED and Cell Therapy Network (TERCEL) of the Instituto de Salud Carlos III of Spain. XT was supported by the Spanish Ministry of Economy and Competitiveness (BFU2012-38146) and the European Research Council (Grant Agreement 242993). JS was supported by the Fundación Botín and Institute Salud Carlos III PI10/01171. PC was supported by AGAUR, and SN and OS were supported by MINECO and IBEC. DR was supported by a fellowship from the National Commission for Science and Technology (CONICYT, Chile) and A. M-A was supported by a fellowship from the Fundación Tatiana Pérez de Guzmán el Bueno.
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Reginensi, D., Carulla, P., Nocentini, S. et al. Increased migration of olfactory ensheathing cells secreting the Nogo receptor ectodomain over inhibitory substrates and lesioned spinal cord. Cell. Mol. Life Sci. 72, 2719–2737 (2015). https://doi.org/10.1007/s00018-015-1869-3
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DOI: https://doi.org/10.1007/s00018-015-1869-3