Norepinephrine Controls Torpor in Mice
Author Information
Author(s): Swoap Steven J., Weinshenker David
Primary Institution: Williams College, Emory University School of Medicine
Hypothesis
Do norepinephrine and leptin interact to control torpor in mice during fasting?
Conclusion
Norepinephrine is essential for both the initiation and recovery from torpor in mice, with leptin deficiency allowing torpor entry despite norepinephrine absence.
Supporting Evidence
- DBL MUT mice entered torpor almost immediately upon fasting.
- Control and ob/ob mice entered torpor, but Dbh −/− mice did not.
- Emergence from torpor was significantly slower in DBL MUT mice compared to controls.
- Administration of a β3 adrenergic receptor antagonist slowed recovery from torpor.
Takeaway
Mice need a chemical called norepinephrine to go into a deep sleep called torpor when they don't have food, and without it, they can't wake up properly from that sleep.
Methodology
The study involved breeding genetically modified mice and measuring their body temperatures during fasting to assess torpor entry and recovery.
Potential Biases
Potential bias in interpreting results due to reliance on specific genetic backgrounds.
Limitations
The study primarily focused on specific genetic mouse models, which may not fully represent the mechanisms in other species.
Participant Demographics
Mice of various genotypes including control, Dbh −/−, ob/ob, and double mutant (DBL MUT) were used.
Statistical Information
P-Value
p<0.0005
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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