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Complement inhibition accelerates regeneration in a model of peripheral nerve injury

Ramaglia, Valeria, Tannemaat, Martijn Rudolf, de Kok, Maryla, Wolterman, Ruud, Vigar, Miriam Ann, King, Rosalind Helen Mary, Morgan, Bryan Paul and Baas, Frank 2009. Complement inhibition accelerates regeneration in a model of peripheral nerve injury. Molecular Immunology 47 (2-3) , pp. 302-309. 10.1016/j.molimm.2009.09.019

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Complement (C) activation is a crucial event in peripheral nerve degeneration but its effect on the subsequent regeneration is unknown. Here we show that genetic deficiency of the sixth C component, C6, accelerates axonal regeneration and recovery in a rat model of sciatic nerve injury. Foot-flick test and Sciatic Function Index monitored up to 5 weeks post-injury showed a significant improvement of sensory and motor function in the C6 deficient animals compared to wildtypes. Retrograde tracing experiments showed a significantly higher number of regenerated neurons at 1 week post-injury in C6 deficient rats than wildtypes. Pathology showed improved nerve regeneration in tibials of C6 deficient animals compared to wildtypes. Reconstitution with purified human C6 protein re-established the wildtype phenotype whereas pharmacological inhibition of C activation with soluble C receptor 1 (sCR1) facilitated recovery and improved pathology similarly to C6 deficient animals. We suggest that a destructive C-mediated event during nerve degeneration hampers the subsequent regenerative process. These findings provide a rationale for the testing of anti-complement agents in human nerve injury.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Uncontrolled Keywords: Crush injury; Complement; Complement inhibitors; Regeneration; Recovery
Publisher: Elsevier
ISSN: 0161-5890
Last Modified: 04 Jun 2017 03:44

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