The aim of the study was to establish whether the dorsal root ganglion neurons supplying the porcine CaMG contain SP and/or CGRP and, additionally, which changes in the expression pattern of these peptides may be induced by a mechanical injury applied to the processes of the above neurons. The study was carried out on consecutive frozen serial sections of DRG taken from 12 eight-week old pigs, in which the neuronal tracer Fast Blue (FB) had been injected three weeks previously into the right CaMG. Six animals were then randomly chosen for ipsilateral ganglionectomy. Eventual changes in the chemical phenotypes of the injured cells were studied a week later using routine double-immunofluorescence labeling. FB+ neurons contained SP and CGRP (32% and 42%, respectively). The vast majority of SP- and CGRP-IR afferent cells belonged to the class of medium-sized (64% and 59%, respectively) and small neurons (32% and 37%, respectively). A co-localization of SP and CGRP was observed in 22% of FB+ neurons. The resection of CaMG resulted in a dramatic increase in the number of FB+ cells containing SP (55%) and a statistically significant decrease in the number of CGRP-IR neurons associated with CaMG (29%). These results suggest that sensory neurons associated with porcine CaMG contain SP and CGRP and that a re-section of CaMG is able to induce profound changes in the expression pattern of the studied peptides, implying deep mechanical injury-induced adaptative changes in the studied afferent neurons.
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