Abstract
The distribution of peptides thought to be involved in pain modulation—substance P, calcitonin gene-related peptide (CGRP), and enkephalin—were studied in the spinal cord and dorsal root ganglia of polyarthritic rats and in rats with one sciatic nerve sectioned prior to induction of arthritis. In arthritic rats there was a bilateral increase of CGRP- and substance P-immunoreactive fibers and appearance of enkephalin-immunoreactive cell bodies in the dorsal horn of the lumbar (L4) spinal cord when compared to controls. In the corresponding dorsal root ganglia there were significant increases of CGRP- (P<0.02) and substance P- (P<0.001) immunoreactive cell bodies compared to controls. In the ventral horn of the control rats CGRP-immunoreactive motoneurons were abundant but were significantly (P<0.001) reduced in the arthritic spinal cord. Less pronounced changes were seen in the contralateral L4 spinal cord of arthritic rats with unilateral sciatic nerve section. In the ipsilateral dorsal horn, however, CGRP- and substance P-immunoreactive fibers were markedly depleted, and no enkephalin cell bodies were present. Furthermore, a number of CGRP-immunoreactive motoneurons were observed. In the ipsilateral L4 ganglia CGRP- (P<0.02) and substance P- (P<0.02) immunoreactive cells were significantly decreased compared to the contralateral side. The data suggest that pain perception is linked to complex interactions between CGRP, substance P, and enkephalin in sensory pathways and an intact peripheral input. The loss of CGRP-immunoreactive motoneurons may reflect muscular dysfunction associated with the arthritic condition.
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Kar, S., Gibson, S.J., Rees, R.G. et al. Increased calcitonin gene-related peptide (CGRP), substance P, and enkephalin immunoreactivities in dorsal spinal cord and loss of CGRP-immunoreactive motoneurons in arthritic rats depend on intact peripheral nerve supply. J Mol Neurosci 3, 7–18 (1991). https://doi.org/10.1007/BF02896844
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DOI: https://doi.org/10.1007/BF02896844