[Experimental study of implantation of neurotropin-3 modified olfactory ensheathing cells in experimental allergic encephalomyelitis].

Objective: To investigate the therapeutic effect of neurotrophin-3 (NT-3) modified olfactory ensheathing cell (OEC) upon experimental allergic encephalomyelitis (EAE).
Methods: OEC-NT-3 gene engineering cell, constructed by neurotrophin-3 transinfecting GEC inducted by retrovirus, was transplanted into lateral ventricle. The migration and distribution were observed and compared with control group and OEC transplantation group. Then myelin repairing and axon regeneration were evaluated from conical somatosensory evoked potential (CSEP), function score and ultrastructural morphology.
Results: (1) OEC-NT-3 could survive, migrate within axons and spread diffusely away from the focus at Day 28 post-transplantation; (2) as compared with other two groups, more nerve fibers, better myelin repair and more distinct myelin structure were observed in the transgene group; (3) as compared with other two groups, the latent time was obviously shortened and the amplitude higher in the transplantation group (P < 0.05); (4) the transcription level of NT-3mRNA in the transgene group was significantly higher than the GEC group and the contrast group (212.32 +/- 16.14) x 10(-2) vs. (1.98 +/- 0.19) x 10(-2), (1.23 +/- 0.13) x 10(-2) (P < 0.01).
Conclusion: OEC-NT-3 cell expresses NT-3 stably and effectively in EAE. It may contribute to the repairing of myelin and the regeneration of axon.