Abstract
Lack of permissive mechanisms and abundance of inhibitory molecules in the lesioned central nervous system of adult mammals contribute to the failure of functional recovery after injury, leading to severe disabilities in motor functions and pain. Peripheral nerve injury impairs motor, sensory, and autonomic functions, particularly in cases where nerve gaps are large and chronic nerve injury ensues. Previous studies have indicated that the neural cell adhesion molecule L1 constitutes a viable target to promote regeneration after acute injury. We screened libraries of known drugs for small molecule agonists of L1 and evaluated the effect of hit compounds in cell-based assays in vitro and in mice after femoral nerve and spinal cord injuries in vivo. We identified eight small molecule L1 agonists and showed in cell-based assays that they stimulate neuronal survival, neuronal migration, and neurite outgrowth and enhance Schwann cell proliferation and migration and myelination of neurons in an L1-dependent manner. In a femoral nerve injury mouse model, enhanced functional regeneration and remyelination after application of the L1 agonists were observed. In a spinal cord injury mouse model, L1 agonists improved recovery of motor functions, being paralleled by enhanced remyelination, neuronal survival, and monoaminergic innervation, reduced astrogliosis, and activation of microglia. Together, these findings suggest that application of small organic compounds that bind to L1 and stimulate the beneficial homophilic L1 functions may prove to be a valuable addition to treatments of nervous system injuries.
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Abbreviations
- BMS:
-
Basso mouse scale
- BrdU:
-
bromodeoxyuridine
- BSA:
-
bovine serum albumin
- ChAT:
-
choline acetyl transferase
- CNS:
-
central nervous system
- FBA:
-
foot-base angle
- GFAP:
-
glial fibrillary acidic protein
- HRP:
-
horse radish peroxidase
- HTA:
-
heels-tail angle
- MBP:
-
myelin basic protein
- NMDA:
-
N-methyl-D-aspartate
- PBS:
-
phosphate-buffered saline solution
- PBST:
-
phosphate-buffered saline solution containing 0.05 % Triton X100
- PLR:
-
protraction-length ratio
- PNS:
-
peripheral nervous system
- RI:
-
recovery index
- TH:
-
tyrosine hydroxylase
- VGAT:
-
vesicular GABA transporter
- VGLUT:
-
vesicular glutamate transporter 1
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Acknowledgments
We thank Eva Kronberg and Ulrike Wolters for excellent animal caretaking and Ute Bork for genotyping of mice, Dagmar Drexler and Barbara Holstermann for help with electron microscopy, and Torsten Renz and Fritz Kutschera for technical support. Melitta Schachner is supported by the New Jersey Commission for Spinal Cord Research and the Li Kashing Foundation at the Shantou University Medical College.
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The authors declare no conflict of interest.
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All authors have contributed substantially to this research study. GL, DL, and MS conceived and designed the experiments. HK, DL, GL, and HC performed the experiments. HK and DL analyzed the data. GL and MS wrote the paper.
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Hardeep Kataria and David Lutz contributed equally to this work.
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Kataria, H., Lutz, D., Chaudhary, H. et al. Small Molecule Agonists of Cell Adhesion Molecule L1 Mimic L1 Functions In Vivo. Mol Neurobiol 53, 4461–4483 (2016). https://doi.org/10.1007/s12035-015-9352-6
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DOI: https://doi.org/10.1007/s12035-015-9352-6