Delayed administration of NGF reverses nerve injury induced central alterations of primary afferents

We have examined whether delayed exogenous NGF administered to an axotomise d peripheral nerve reverses the increased transganglionic choleragenoid (CT B) labelling in lamina II. Two, four, eight or 18 weeks after bilateral sci atic nerve section, NGF was applied unilaterally for an additional 2-week p eriod to the transected nerve stump. The transganglionic choleragenoid labe lling and substance P (SP) expression were determined and compared to the c ontralateral axotomised side in the spinal cord dorsal horn. Delayed NGF ad ministration reversed the transganglionic choleragenoid labelling in lamina II when administered 2 or 18 weeks after the sciatic nerve lesion, but not at 4 or 8 weeks. There was also a clear recovery of SP on the axotomised, NGF-treated side 2 or 18 weeks after the sciatic nerve lesion, but not at t he intermediate survival times. At the longer survival time, however, there was a recovery of SP regardless of NGF treatment. These results suggest th at there is a critical window as to when NGF administration can be effectiv e in reversing axotomy-induced changes in the spinal cord. NeuroReport 12:1 899-1902 (C) 2001 Lippincott Williams & Wilkins.