Functional, morphological and biomolecular assessment of posttraumatic neuro-muscular recovery in the rat forelimb model

Over the last five years, we have used the rat forelimb model for investigating neuromuscular recovery after microsurgical nerve reconstruction of median and ulnar nerves by end-to-side neurorrhaphy and muscle-vein-combined tubulization (using both straight and Y-shaped guides). The outcome of nerve repair at different postoperative times was assessed by functional, morphological and biomolecular analysis. Results showed that both end-to-side and tubulization repair of rat median and ulnar nerves led to successful axonal regeneration along the severed nerve trunk as well as to a partial recovery of the lost function as assessed by grasping test. Biomolecular analysis by means of reverse transcription polymerase chain reaction (RT-PCR) demonstrated early overexpression during nerve regeneration of the gliotrophic factor NRG1 and two of its receptors: erbB2 and erbB3. Finally, our experience also suggests that the rat forelimb experimental model is particularly appropriate for the study of microsurgical reconstruction of major mixed nerve trunks. Furthermore, since the forelimb model is less compromising for the animal, it should be preferred to the hindlimb model for many research purposes.