This study reports on the possible origin and putative sensory nature of substance P-containing fibres in the lung. Following vagal ligation experiments, carried out on adult guinea pigs, the vagi, nodose ganglia and lungs were investigated by immunocytochemistry and radioimmunoassay. After ligation the lung showed a marked depletion of substance P-immunoreactivity; concomitantly there was an accumulation of immunoreactive material proximal to the ligature, indicating a peripheral direction of the peptide axonal flow. Several substance P-immunoreactive neuronal cell bodies were observed in the nodose ganglion. These results suggest that substance P-immunoreactive fibres in the lung might originate from primary sensory neurones in the nodose ganglion, which is compatible with other evidence that substance P has a sensory role.
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