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Effect of peripheral nerve cut on neuropeptides in dorsal root ganglia and the spinal cord of monkey with special reference to galanin

  • Published:
Journal of Neurocytology

Summary

Using the indirect immunofluorescence method andin situ hybridization, the localization and levels of immunoreactivities and mRNAs for several neuropeptides were studied in lumbar dorsal root ganglia and spinal cord of untreated monkeys (Macaca mulatto) and after unilateral transection of the sciatic nerve. Immunoreactive galanin, calcitonin gene-related peptide, substance P and somatostatin and their mRNAs were found in cell bodies in dorsal root ganglia of untreated monkeys and on the contralateral side of the monkeys with unilateral sciatic nerve lesion. After axotomy there was a marked decrease in the number of calcitonin gene-related peptide-, substance P- and somatostatin-positive neurons in dorsal root ganglia ipsilateral to the lesion, whereas the number of galanin positive cells strongly increased. A few neuropeptide tyrosine-positive cells were seen in after axotomy, whereas no such neurons were found in controls. No vasoactive intestinal polypeptide-, peptide histidine isoleucine-, cholecystokinin-, dynorphin-, enkephalin-, neurotensin-or thyrotrophin releasing hormone-positive cell bodies were seen in dorsal root ganglia of any of the groups studied. In the dorsal horn of the spinal cord all peptide immunoreactivities described above, except thyrotropin releasing hormone, were found in varying numbers of nerve fibres with a similar distribution in untreated monkeys and in the contralateral dorsal horn in monkey with unilateral sciatic nerve lesion. Two cholecystokinin antisera were used directed against the C- and N-terminal portions, respectively, showing a distinctly different distribution pattern in the dorsal horn. Somatostatin- and dynorphin-like immunoreactivities were also observed in small neurons in the dorsal horn. No certain effect of axotomy on these interneurons could be seen. However, marked changes were observed after this type of lesion for some peptide containing fibres in the ipsilateral dorsal horn. Thus, there was a marked increase in galanin-like immunoreactivity, whereas calcitonin gene-related peptide-, substance P-, somatostatin-, peptide histidine isoleucine neurotensin- and cholecystokinin-like immunoreactivities decreased. No changes could be observed in neuropeptide tyrosine or enkephalin-positive fibres. The present results demonstrate marked ganglionic and transganglionic changes in peptide levels after peripheral axotomy. When compared to published results on the effect of axotomy on peptides in dorsal root ganglia and spinal cord of rat, both similarities and differences were encountered. Thus, in contrast to rat there was no marked upregulation of vasoactive intestinal polypeptide/peptide histidine isoleucine or neuropeptide tyrosine after axotomy in the monkey, whereas galanin was increased in both species. Both in monkey and rat, calcitonin gene-related peptide, substance P and somatostatin decreased. The decrease in neurotensin, peptide histidine isoleucine, and ‘genuine’ cholecystokinin seen in monkey after axotomy has not been reported in the rat. Experimental studies on rat suggest that galanin may be an endogenous analgesic compound, active particularly after peripheral nerve lesions. We have therefore recently proposed that galanin agonists may be used in treatment of chronic pain, and the present demonstration that galanin is regulated in a similar fashion in a primate gives further support to the proposal to test galanin as an analgesic in human.

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  1. R. Elde

    Present address: Department of Cell Biology and Neuroanatomy, University of Minnesota, 321 Church Street SE, 55455, Minneapolis, MN, USA

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  1. Department of Histology and Neurobiology, Karolinska Institute, Stockholm, Sweden

    X. Zhang, R. Elde & T. Hökfelt

  2. Department of Neuroscience, Institute of Neuroscience, Xian, PRC

    X. Zhang & G. Ju

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Zhang, X., Ju, G., Elde, R. et al. Effect of peripheral nerve cut on neuropeptides in dorsal root ganglia and the spinal cord of monkey with special reference to galanin. J Neurocytol 22, 342–381 (1993). https://doi.org/10.1007/BF01195558

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