Polysialic acid expression is not necessary for motor neuron target selectivity
Grant A. Robinson PhD
Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA
Search for more papers by this authorCorresponding Author
Roger D. Madison PhD
Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA
Biological Laboratory Research and Development Service of the Veterans Affairs Medical Center, Building 16, Room 38, 508 Fulton Street, Durham, North Carolina, 27705 USA
Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA. E-mail: [email protected]Search for more papers by this authorGrant A. Robinson PhD
Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA
Search for more papers by this authorCorresponding Author
Roger D. Madison PhD
Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA
Biological Laboratory Research and Development Service of the Veterans Affairs Medical Center, Building 16, Room 38, 508 Fulton Street, Durham, North Carolina, 27705 USA
Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA. E-mail: [email protected]Search for more papers by this authorAbstract
Introduction: Recovery after peripheral nerve lesions depends on guiding axons back to their targets. Polysialic acid upregulation by regrowing axons has been proposed recently as necessary for this target selectivity. Methods: We reexamined this proposition using a cross-reinnervation model whereby axons from obturator motor neurons that do not upregulate polysialic acid regenerated into the distal femoral nerve. Our aim was to assess their target selectivity between pathways to muscle and skin. Results: After simple cross-repair, obturator motor neurons showed no pathway preference, but the same repair with a shortened skin pathway resulted in selective targeting of these motor neurons to muscle by a polysialic acid–independent mechanism. Conclusion: The intrinsic molecular differences between motor neuron pools can be overcome by manipulation of their access to different peripheral nerve pathways such that obturator motor neurons preferentially project to a terminal nerve branch to muscle despite not upregulating the expression of polysialic acid. Muscle Nerve 47: 364–371, 2013
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