Journal
JOURNAL OF CHEMICAL NEUROANATOMY
Volume 77, Issue -, Pages 1-9Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jchemneu.2016.02.003
Keywords
Neurogenesis; Olfactory receptor neurons; Olfactory injury; Neural stem cells; Olfaction
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Funding
- Consejo Nacional de Investigaciones Cientificas y Tecnicas [CONICET PIP 11220120100376]
- Universidad de Buenos Aires [UBACyT 100148BA]
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Neural stem cells (NSCs) of the olfactory epithelium (OE) are responsible for tissue maintenance and the neural regeneration after severe damage of the tissue. In the normal OE, NSCs are located in the basal layer, olfactory receptor neurons (ORNs) mainly in the middle layer, and sustentacular (SUS) cells in the most apical olfactory layer. In this work, we induced severe damage of the OE through treatment with a zinc sulfate (ZnSO4) solution directly in the medium, which resulted in the loss of ORNs and SUS cells, but retention of the basal layer. During recovery following injury, the OE exhibited increased proliferation of NSCs and rapid neural regeneration. After 24 h of recovery, new ORNs and SUS cells were observed. Normal morphology and olfactory function were reached after 168 h (7 days) of recovery after ZnSO4 treatment. Taken together, these data support the hypothesis that NSCs in the basal layer activate after OE injury and that these are sufficient for complete neural regeneration and olfactory function restoration. Our analysis provides histological and functional insights into the dynamics between olfactory neurogenesis and the neuronal integration into the neuronal circuitry of the olfactory bulb that restores the function of the olfactory system. (C) 2016 Published by Elsevier B.V.
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