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- Title
The alteration of odor-induced c-Fos immunoreactivity in the rat olfactory bulb after olfactory nerve transection.
- Authors
Kawamoto, Masahiro; Tamura, Manabu; Ohno, Koji; Kawasaki, Yoshiaki; Mori, Katsumi; Shikina, Takashi; Noda, Kazuhiro; Kubo, Takeshi
- Abstract
We used the rats in which one olfactory nerve had been transected and observed the odor (Propionic acid) -induced c-Fos immunoreactivity in the bulb at different times (2, 4, 8 weeks) after nerve transection. The exposure to odor produced a strong cluster of c-Fos positive cells in the mediodorsal region of the intact bulb. On the other hand, the transected bulb showed much less reactivity 2 weeks after neurectomy; however, a large number of positive cells were observed in the whole of the bulb from 4 weeks after neurectomy. Furthermore, we measured the levels of mRNA for tyrosine hydroxylase (TH), which was the marker of odor-induced olfactory nerve activity in the bulb, by using real-time PCR. The level of TH mRNA decreased on the transected side at 2 weeks but recovered to the level of the contralateral side at 4 weeks after neurectomy. We firstly demonstrated that projection mapping of odor receptors was altered after olfactory nerve transection by using an immunohistochemical method.
- Subjects
OLFACTORY nerve; CRANIAL nerves; SMELL; MESSENGER RNA; FATTY acids; AMINO acids; TYROSINE; RAT physiology
- Publication
Journal of Neurology, 2003, Vol 250, Issue 1, p51
- ISSN
0340-5354
- Publication type
Article
- DOI
10.1007/s00415-003-0948-9