Abstract
The olfactory system is exposed to a plethora of chemical compounds throughout an organism's lifespan. Anticipation of stimuli and construction of appropriate neural filters present a significant challenge. This may be addressed via modulation of the protein composition of the sensory epithelium in response to environmental conditions. To reveal the mechanisms governing these changes, we employed a comprehensive quantitative proteomics strategy. Two groups of juvenile mice were treated with either pulsed or continuous application of octanal. After 20 days of treatment, we performed a behavioral study and conducted electrophysiological recordings from the olfactory epithelium (OE). Both treated groups demonstrated peripheral desensitization to octanal; however, only the 'continuous' group exhibited habituation. To obtain novel insight into the molecular mechanisms underpinning the peripheral desensitization to octanal, the OE proteomes of octanal-treated mice versus control were quantitatively analyzed using two-dimensional difference gel electrophoresis. We identified several significantly regulated proteins that were functionally classified as calcium-binding proteins, cytoskeletal proteins, and lipocalins. The calcium-binding proteins and cytoskeletal proteins were up-regulated in the 'pulsed' group, whereas in the 'continuous' group, four lipocalins were significantly down-regulated. Uniquely, the lipocalin odorant-binding protein Ia was drastically down-regulated in both groups. The identified proteins reflect changes throughout the entire OE, corresponding to changes in neuronal, non-neuronal, and pericellular processes. We report the regulation of several promising candidates for the investigation of odorant-induced changes of the OE. Among these proteins are different lipocalins, which seem to play a crucial role in the regulation of the sensitivity of the olfactory system.
- 2,calcium-binding
- aldehydes/chemistry,animals,calbindin
- binding
- c57bl,neuronal
- calcium
- g/analysis/metabolism,smell/physiology,tandem
- gel
- inbred
- mass
- mucosa/*metabolism/physiology,olfactory
- neurons/physiology,pregnancy,proteins/analysis/metabolism,proteomics/*methods,receptors
- odorant/analysis/metabolism,s100
- plasticity/*physiology,olfactory
- protein
- proteins/analysis/metabolism,cytoskeletal
- proteins/analysis/metabolism,down-regulation,electrophoresis
- psychophysiologic,lipocalins/analysis/metabolism,male,mice,mice
- receptor
- spectrometry,to_read,up-regulation
- two-dimensional,electrophysiology,female,habituation
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