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.
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Received: 11 December 2001, Received in revised form: 4 July 2002, Accepted: 12 July 2002
Correspondence to M. Tamura
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Kawamoto, M., Tamura, M., Ohno, K. et al. The alteration of odor-induced c-Fos immunoreactivity in the rat olfactory bulb after olfactory nerve transection. J Neurol 250, 51–54 (2003). https://doi.org/10.1007/s00415-003-0948-9
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DOI: https://doi.org/10.1007/s00415-003-0948-9