Three structurally similar odorants trigger distinct signaling pathways in a mouse olfactory neuron
1Department of Biological and Chemical Sciences, Illinois Institute of Technology, 3101 S. Dearborn Street, Chicago, IL 60616, USA.
Olfactory sensory neurons (OSNs) can activate distinct signaling pathways using a single olfactory receptor, revealing complex information processing in smell. This plasticity in G-protein-coupled receptor signaling offers insights beyond olfaction.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Mammalian olfactory sensory neurons (OSNs) typically express a single olfactory receptor gene.
- Understanding how OSNs process diverse odorant information is crucial for olfactory research.
Purpose of the Study:
- To investigate distinct signaling pathways mediated by a single olfactory receptor in specific OSNs.
- To explore the mechanisms of olfactory transduction and G-protein-coupled receptor (GPCR) signaling plasticity.
Main Methods:
- Calcium imaging of individual OSNs in intact mouse olfactory turbinates.
- Pharmacological studies and binary-mixture/cross-adaptation analyses of odorant responses.
Main Results:
- A subset of OSNs (Ho-OSNs) responded to structurally similar ligands (2-heptanone, heptaldehyde, cis-4-heptenal) via distinct pathways (cAMP, diacylglycerol, or a combination).
- Novel mechanisms were identified in phospholipase C-mediated calcium changes.
- Evidence suggests three odorants activated the same olfactory receptor, which mediated multiple signaling pathways specifically in Ho-OSNs.
Conclusions:
- Ligand-induced conformational changes in olfactory receptors can trigger distinct signaling pathways, enabling complex olfactory information processing.
- This study highlights the plasticity and complexity of GPCR activation and signal transduction, with implications beyond the olfactory system.
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