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Odor Enrichment Increases Hippocampal Neuron Numbers in Mouse
Zoltán Rusznák1, Gulgun Sengul2, George Paxinos1,3
1Neuroscience Research Australia, Sydney, NSW 2031, Australia.
Experimental Neurobiology
|May 8, 2018
Summary
Novel pleasant odors significantly boosted new neuron growth in the hippocampus and olfactory bulb of mice. This suggests environmental enrichment may help combat neurodegenerative diseases like Alzheimer's.
Area of Science:
- Neuroscience
- Cell Biology
- Neurodegenerative Disorders
Background:
- The hippocampus and olfactory bulb are key brain regions for neurogenesis.
- Altered hippocampal neurogenesis is an early indicator of Alzheimer's disease.
- Olfactory stimuli may influence hippocampal neurogenesis via memory pathways.
Purpose of the Study:
- To investigate the effect of olfactory stimuli on hippocampal and olfactory bulb neurogenesis.
- To determine if novel odor exposure impacts neuronal and glial cell populations.
- To explore the potential of olfactory enrichment in mitigating neurodegeneration.
Main Methods:
- Mice were exposed to novel pleasant odors for three weeks.
- The isotropic fractionator method was used to quantify cell numbers.
- Cell proliferation and neurogenesis markers were assessed in the hippocampus and olfactory bulb.
Main Results:
- Odor enrichment significantly increased neuronal cell numbers in the hippocampus.
- Cell proliferation and neurogenesis were promoted in the olfactory bulb.
- Glial cell numbers remained unchanged in both brain regions.
Conclusions:
- Exposure to novel odor stimuli enhances hippocampal neurogenesis.
- Environmental enrichment through olfactory stimuli may offer protective effects against neurodegenerative disorders.
- These findings support the potential of enriched environments in delaying or slowing neurodegeneration.
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