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Updated: Sep 4, 2025
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Quadruple Immunostaining of the Olfactory Bulb for Visualization of Olfactory Sensory Axon Molecular Identity Codes
Published on: June 5, 2017
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An ErbB4-Positive Neuronal Network in the Olfactory Bulb for Olfaction
Zhibing Tan1, Zhipeng Liu1, Yu Liu1
1Department of Neurosciences, Case Western Reserve University, School of Medicine, Cleveland, Ohio 44106.
Summary
Researchers identified a new group of inhibitory neurons in the olfactory bulb (OB) that express ErbB4. These ErbB4-positive neurons regulate olfactory processing and are crucial for normal odor discrimination and sensitivity.
Area of Science:
- Neuroscience
- Molecular Biology
- Sensory Systems
Background:
- Olfactory information processing relies on the olfactory bulb (OB), where mitral cells are regulated by interneurons.
- Mechanisms controlling olfactory bulb interneuron activity remain largely unknown.
Purpose of the Study:
- To investigate the role of the transmembrane tyrosine kinase ErbB4 in olfactory bulb interneurons.
- To identify novel neuronal populations involved in olfactory processing.
Main Methods:
- Utilized optogenetics and chemical genetics in mouse models.
- Examined ErbB4 expression in olfactory bulb (OB) inhibitory neurons.
- Assessed effects of ErbB4 manipulation on neuronal oscillations and olfactory behavior.
Main Results:
- Identified a novel subset of ErbB4-positive (ErbB4+) inhibitory neurons in the glomerular layer (GL) and granule cell layer (GCL) of the OB.
- Optogenetic activation of ErbB4+ neurons induced theta and gamma oscillations.
- NRG1-ErbB4 signaling regulates GABA transmission onto mitral cells, impacting olfactory sensitivity and odor discrimination.
Conclusions:
- ErbB4+ neurons form a distinct inhibitory network in the OB, crucial for regulating local synchrony and olfactory perception.
- Dysfunction in the NRG1-ErbB4 pathway may underlie olfactory deficits in neuropsychiatric disorders.
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