Fear-Inducing Odor Affects Brain Protein Expression
Author Information
Author(s): Harry Pantazopoulos, Hamid Dolatshad, Fred C. Davis
Primary Institution: Department of Biology, Northeastern University
Hypothesis
Clock genes are involved in the formation of a time-stamp fear memory.
Conclusion
Repeated exposure to a fear-inducing odor alters the rhythm of PER2 and c-Fos expression in brain regions involved in processing fear memory.
Supporting Evidence
- Rodents learn to associate a foot shock with time of day.
- Mice retain fear memory better during the early day than the early night.
- TMT exposure alters PER2 and c-Fos expression in the amygdala.
- Changes in protein expression were observed 24 hours after TMT exposure.
Takeaway
When mice smell something scary, it changes how their brains work, especially during the day compared to night.
Methodology
Mice were exposed to a fear-inducing odor at different times, and their brain protein levels were measured afterward.
Potential Biases
Potential bias from the control conditions and the handling of animals.
Limitations
The study may not account for all factors affecting fear memory and protein expression.
Participant Demographics
Adult male C3H and C57BL6 mice.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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