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Chem. Senses 25: 401-406, 2000
© Oxford University Press 2000

Regional Distribution of Protein Kinases in Normal and Odor-deprived Mouse Olfactory Bulbs

Nian Liu

Laboratory of Molecular Neurobiology, Weill Medical College of Cornell University at The Burke Medical Research Institute, White Plains, NY 10605, USA

Correspondence to be sent to: Nian Liu, Laboratory of Molecular Neurobiology, Weill Medical College of Cornell University at The Burke Medical Research Institute, 785 Mamaroneck Avenue, White Plains, NY 10605, USA. e-mail: nliu{at}burke.org

Unilateral naris closure produced dramatic down-regulation of tyrosine hydroxylase (TH) gene expression in periglomerular dopaminergic neurons in the olfactory bulb. To explore molecular mechanisms of TH gene regulation, the present study investigated the regional distribution of protein kinase A (PKA{alpha}), protein kinase C (PKC{alpha}), and CaM kinases II (CaMKII{alpha}, ß) and IV (CaMKIV) in the normal olfactory bulb and in response to odor deprivation. Strong PKA{alpha} immunostaining was found in the glomerular, granule cell, external plexiform and olfactory nerve layers. PKC{alpha} staining was strong in granule cell and external plexiform layers but weak in the glomerular layer. Whereas CaMKIV was primarily found in granule cells, CaMKII was present in the glomerular, external plexiform, mitral cell and granule cell layers. No change in immunoreactivities of these kinases occurred in the olfactory bulb ipsilateral to naris closure. The expression of PKA{alpha}, PKC{alpha} and CaMKII, but not CaMKIV, in periglomerular cells suggests that these three kinases may play a role in TH gene regulation in the olfactory bulb. The lack of change in kinase protein levels after naris closure also suggests that any involvement of these kinases in TH gene expression in the olfactory bulb must be through altered kinase activity and not protein levels.


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