• Mol. Cell. Neurosci. · Oct 2008

    Assessment of functional recovery and axonal sprouting in oligodendrocyte-myelin glycoprotein (OMgp) null mice after spinal cord injury.

    • Benxiu Ji, Lauren C Case, Kai Liu, Zhaohui Shao, Xinhua Lee, Zhongshu Yang, Joy Wang, Tim Tian, Svetlana Shulga-Morskaya, Martin Scott, Zhigang He, Jane K Relton, and Sha Mi.
    • Department of Discovery Biology, Biogen Idec Inc., 14 Cambridge Center, Cambridge MA 02142, USA.
    • Mol. Cell. Neurosci. 2008 Oct 1;39(2):258-67.

    AbstractOligodendrocyte-myelin glycoprotein (OMgp) is a myelin component that has been shown in vitro to inhibit neurite outgrowth by binding to the Nogo-66 receptor (NgR1)/Lingo-1/Taj (TROY)/p75 receptor complex to activate the RhoA pathway. To investigate the effects of OMgp on axon regeneration in vivo, OMgp(-/-) mice on a mixed 129/Sv/C57BL/6 (129BL6) or a C57BL/6 (BL6) genetic background were tested in two spinal cord injury (SCI) models - a severe complete transection or a milder dorsal hemisection. OMgp(-/-) mice on the mixed 129BL6 genetic background showed greater functional improvement compared to OMgp(+/+) littermates, with increased numbers of cholera toxin B-labeled ascending sensory axons and 5-HT(+) descending axons and less RhoA activation after spinal cord injury. Myelin isolated from OMgp(-/-) mice (129BL6) was significantly less inhibitory to neurite outgrowth than wild-type (wt) myelin in vitro. However, OMgp(-/-) mice on a BL/6 genetic background showed neither statistically significant functional recovery nor axonal sprouting following dorsal hemisection.

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