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Neuropeptide Y (NPY)-like immunoreactivity was examined by fluorescence immunohistochemistry in rat sciatic neuromas, L5 dorsal root ganglias (DRGs) and L5 dorsal roots 1-3 weeks after chronic nerve injury. Anterograde tracing demonstrated that a large number of NPY-positive neuroma fibers were sensory. These fibers were mostly large diameter axons, in line with the finding that a majority of NPY-immunoreactive neurons in the DRG were medium- to large-sized neurons which showed immunoreactivity to the neurofilament antibody RT 97. In dorsal roots NPY immunoreactivity was strong after sciatic neuroma formation. Dorsal rhizotomy and ligation, on the other hand, did not induce NPY immunoreactivity at any of the sites examined.
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