Abstract:
:The nodose ganglion contains placode-derived visceral sensory neurons of the vagus nerve. Previous study showed that axotomy-induced deafferentation reduced the number of tyrosine hydroxylase-immunoreactive and increased the number of vasoactive intestinal peptide-immunoreactive neurons in the ganglion. The present study was conducted to determine whether the changes in neuropeptide/neurotransmitter enzyme content are associated with changes in the expression of tyrosine hydroxylase and vasoactive intestinal peptide messenger RNAs in the nodose ganglion. We used in situ hybridization histochemistry with 35S-labeled oligonucleotide probes for tyrosine hydroxylase and vasoactive intestinal peptide precursor messenger RNAs. Peripheral axotomy of visceral afferent inputs reduced tyrosine hydroxylase messenger RNA and increased vasoactive intestinal peptide messenger RNA expression in neurons of the nodose ganglion of the rat. The number of tyrosine hydroxylase messenger RNA-containing neurons was significantly reduced at three, seven and 14 days after axotomy-induced deafferentation compared with intact and sham-operated controls. Labeling density of tyrosine hydroxylase messenger RNA-containing neurons was significantly reduced at three and seven days. Conversely, the number of vasoactive intestinal peptide messenger RNA-containing neurons increased significantly at three, seven and 14 days, while the labeling density of vasoactive intestinal peptide messenger RNA-containing neurons also increased at one, three, seven and 14 days. The results of the present study indicate that the axotomy-induced down-regulation of tyrosine hydroxylase and up-regulation of vasoactive intestinal peptide in the neurons of the nodose ganglion are associated with changes in their messenger RNAs in response to axotomy-induced deafferentation.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Zhuo H,Sinclair C,Helke CJdoi
10.1016/0306-4522(94)90555-xsubject
Has Abstractpub_date
1994-11-01 00:00:00pages
617-26issue
2eissn
0306-4522issn
1873-7544pii
0306-4522(94)90555-Xjournal_volume
63pub_type
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