Increased expression of nitric oxide synthase in a subpopulation of rat sympathetic neurons after axotomy - correlation with vasoactive intestinal peptide

Nitric oxide synthase (NOS) expression is increased in peripheral sensory and central motor neurons after axotomy. By applying double-labelling immunofluorescence and non-radioactive in situ hybridization, we have investigated the regulation of NOS in axotomized sympathetic rat superior cervical gan...

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Main Authors: Klimaschewski, Lars Peter (Author) , Obermüller, Nicholas (Author) , Majewski, Mariusz (Author) , Bachmann, Sebastian (Author) , Heym, Christine (Author)
Format: Article (Journal)
Language:English
Published: August 1996
In: Cell & tissue research
Year: 1996, Volume: 285, Issue: 3, Pages: 419-425
ISSN:1432-0878
DOI:10.1007/s004410050658
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/s004410050658
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Author Notes:Lars Klimaschewski, Nicholas Obermüller, Mariusz Majewski, Sebastian Bachmann, Christine Heym

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520 |a Nitric oxide synthase (NOS) expression is increased in peripheral sensory and central motor neurons after axotomy. By applying double-labelling immunofluorescence and non-radioactive in situ hybridization, we have investigated the regulation of NOS in axotomized sympathetic rat superior cervical ganglia. Furthermore, co-localization of NOS with vasoactive intestinal peptide, which is also induced by axotomy, has been examined. Very few (<0.1%) NOS-expressing neurons are observed in control ganglia. Some large cell bodies located at the exit of the internal carotid nerve are additionally immunoreactive for vasoactive intestinal peptide. One week following postganglionic axotomy, the number of NOS-immunoreactive and NOS mRNA-expressing neurons increases but does not exceed 2% of the whole neuronal population. About 20% of these neurons are also immunoreactive for vasoactive intestinal peptide. Preganglionic nerve fibre meshworks that are immunoreactive for NOS in untreated ganglia disappear after ganglionic decentralization, whereas some presumably postganglionic fibres remain visible after combined axotomy and decentralization. The findings are indicative of an increased synthesis of NOS in a small subset of postganglionic neurons of the rat superior cervical ganglion, possibly because of the loss of target-derived factors that inhibit nitric oxide synthesis under normal conditions. 
650 4 |a Axotomy 
650 4 |a In situ hybridization 
650 4 |a Key words: Immunohistochemistry 
650 4 |a Neuroplasticity 
650 4 |a Nitric oxide synthase 
650 4 |a Rat (Sprague Dawley) 
650 4 |a Sympathetic neuron 
650 4 |a Vasoactive intestinal peptide 
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