Activity-dependent changes in cholinergic innervation of the mouse olfactory bulb
Ernesto Salcedo1, Tuan Tran, Xuan Ly
1Department of Cell and Developmental Biology, University of Colorado, School of Medicine, Aurora, Colorado, United States of America.
Plos One
|November 5, 2011
Summary
Cholinergic system mapping in the mouse main olfactory bulb (MOB) reveals uneven innervation patterns. Naris occlusion significantly alters this cholinergic innervation in adult animals.
Area of Science:
- Neuroscience
- Olfactory System Research
- Developmental Biology
Background:
- The role of cholinergic modulation in olfactory processing is not fully elucidated.
- Understanding the precise distribution of cholinergic neurons is crucial for deciphering olfactory circuit function.
Purpose of the Study:
- To map cholinergic innervation patterns in the murine main olfactory bulb (MOB) during development and under altered sensory input.
- To investigate the impact of naris occlusion on cholinergic innervation in the glomerular layer (GL).
Main Methods:
- Utilized a transgenic mouse model expressing tau-GFP under the choline acetyltransferase (ChAT) promoter for clear visualization of cholinergic pathways.
- Examined cholinergic innervation across different developmental stages.
- Analyzed changes in innervation following unilateral naris occlusion in adult mice.
Main Results:
- Demonstrated an uneven distribution of cholinergic innervation in the adult MOB glomerular layer (GL), with specific anterior, medial, and lateral regions showing heavier innervation.
- Observed significant alterations in the pattern of cholinergic innervation to the GL after unilateral naris occlusion, differing between ipsilateral and contralateral bulbs.
Conclusions:
- Cholinergic innervation of the MOB is spatially organized and dynamic.
- Sensory experience, such as naris occlusion, can modify cholinergic circuitry in the olfactory bulb, suggesting adaptive plasticity.
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