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The Histochemical Journal

, Volume 28, Issue 7, pp 485–493 | Cite as

5-Hydroxytryptamine immunoreactivity is detectable in sympathetic nerve fibres in rat oral tissues

  • Lars-Inge Norevall
  • Lars Matsson
  • Sture Forsgren
Papers

Summary

The aim of this investigation was to examine if 5-hydroxytryptamine (5-HT) is detectable not only in mast cells but also in sympathetic nerve fibres in oral sites of the rat, including the periodontal ligament, pulp, palatal mucosa, and vestibular sulcus. Antibodies against 5-HT and tyrosine hydroxylase were used. Maxillae from rats were dissected free, fixed, decalcified, cut transversally, and processed for immunohistochemistry. Nerve fibres showing 5-HT-like immunoreactivity were regularly observed in the walls of the arteries and arterioles in the vestibular sulcus and the periodontal ligament. However, 5-HT-like immunoreactivity was not seen in the walls of the vessels of the palatal mucosa. Interestingly, 5-HT-like immunoreactivity coexisted with tyrosine hydroxylase-like immunoreactivity in the innervation of the periodontal ligament and the vestibular sulcus. Thus, the present study gives morphological correlate for the occurrence of effects of 5-HT derived not only from mast cells but also from sympathetic nerve fibres in oral tissues. The source of 5-HT in the nerve fibres as well as the functional implications of the observations remain to be determined.

Keywords

Tyrosine Mast Cell Nerve Fibre Tyrosine Hydroxylase Sympathetic Nerve 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • Lars-Inge Norevall
    • 1
  • Lars Matsson
    • 2
  • Sture Forsgren
    • 3
  1. 1.Department of OrthodonticsUmeå UniversityUmeåSweden
  2. 2.Department of PedodonticsUmeå UniversityUmeåSweden
  3. 3.Department of AnatomyUmeå UniversityUmeåSweden

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