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Is TrpM5 a reliable marker for chemosensory cells? Multiple types of microvillous cells in the main olfactory epithelium of mice.
- Source :
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BMC neuroscience [BMC Neurosci] 2008 Dec 04; Vol. 9, pp. 115. Date of Electronic Publication: 2008 Dec 04. - Publication Year :
- 2008
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Abstract
- Background: In the past, ciliated receptor neurons, basal cells, and supporting cells were considered the principal components of the main olfactory epithelium. Several studies reported the presence of microvillous cells but their function is unknown. A recent report showed cells in the main olfactory epithelium that express the transient receptor potential channel TrpM5 claiming that these cells are chemosensory and that TrpM5 is an intrinsic signaling component of mammalian chemosensory organs. We asked whether the TrpM5-positive cells in the olfactory epithelium are microvillous and whether they belong to a chemosensory system, i.e. are olfactory neurons or trigeminally-innervated solitary chemosensory cells.<br />Results: We investigated the main olfactory epithelium of mice at the light and electron microscopic level and describe several subpopulations of microvillous cells. The ultrastructure of the microvillous cells reveals at least three morphologically different types two of which express the TrpM5 channel. None of these cells have an axon that projects to the olfactory bulb. Tests with a large panel of cell markers indicate that the TrpM5-positive cells are not sensory since they express neither neuronal markers nor are contacted by trigeminal nerve fibers.<br />Conclusion: We conclude that TrpM5 is not a reliable marker for chemosensory cells. The TrpM5-positive cells of the olfactory epithelium are microvillous and may be chemoresponsive albeit not part of the sensory apparatus. Activity of these microvillous cells may however influence functionality of local elements of the olfactory system.
- Subjects :
- Animals
Axons ultrastructure
Chemoreceptor Cells chemistry
Chemoreceptor Cells cytology
Chemoreceptor Cells ultrastructure
Mice
Mice, Inbred C57BL
Mice, Transgenic
Microvilli ultrastructure
Olfactory Mucosa cytology
Olfactory Mucosa ultrastructure
TRPM Cation Channels genetics
Biomarkers analysis
Olfactory Mucosa chemistry
Olfactory Mucosa innervation
TRPM Cation Channels analysis
Subjects
Details
- Language :
- English
- ISSN :
- 1471-2202
- Volume :
- 9
- Database :
- MEDLINE
- Journal :
- BMC neuroscience
- Publication Type :
- Academic Journal
- Accession number :
- 19055837
- Full Text :
- https://doi.org/10.1186/1471-2202-9-115