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Effect of combined treatment with methylprednisolone and soluble Nogo-66 receptor after rat spinal cord injury.

  • Benxiu Ji‎ et al.
  • The European journal of neuroscience‎
  • 2005‎

Methylprednisolone (MP) is a synthetic glucocorticoid used for the treatment of spinal cord injury (SCI). Soluble Nogo-66 receptor (NgR) ectodomain is a novel experimental therapy for SCI that promotes axonal regeneration by blocking the growth inhibitory effects of myelin constituents in the adult central nervous system. To evaluate the potential complementarity of these mechanistically distinct pharmacological reagents we compared their effects alone and in combination after thoracic (T7) dorsal hemisection in the rat. Treatment with an ecto-domain of the rat NgR (27-310) fused to a rat IgG [NgR(310)ecto-Fc] (50 microm intrathecal, 0.25 microL/h for 28 days) or MP alone (30 mg/kg i.v., 0, 4 and 8 h postinjury) improved the rate and extent of functional recovery measured using Basso, Beattie, Bresnahan (BBB) scoring and footprint analysis. The effect of MP treatment on BBB score was apparent the day after SCI whereas the effect of NgR(310)ecto-Fc was not apparent until 2 weeks after SCI. NgR(310)ecto-Fc or MP treatment resulted in increased axonal sprouting and/or regeneration, quantified by counting biotin dextran amine-labeled corticospinal tract axons, and increased the number of axons contacting motor neurons in the ventral horn gray matter caudal to the lesion. Combined treatment with NgR(310)ecto-Fc and MP had a more pronounced effect on recovery of function and axonal growth compared with either treatment alone. The data demonstrate that NgR(310)ecto-Fc and MP act in a temporally and mechanistically distinct manner and suggest that they may have complementary effects.


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