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Delta9 -tetrahydrocannabinol increases brain temperature and inverts circadian rhythms
R R Perron1, R L Tyson, G R Sutherland
1Seaman Family MR Research Centre, Department of Clinical Neurosciences, University of Calgary, 1403-29 Street N.W. Calgary, Alberta T2N 2T9 Canada.
Neuroreport
|December 1, 2001
Summary
Delta9-tetrahydrocannabinol (THC) increases brain temperature in rats, but not body core temperature. This finding is crucial for understanding THC's neuroprotective effects during ischemia.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Delta9-tetrahydrocannabinol (THC) demonstrates neuroprotective properties against ischemic brain injury.
- Hypothermia is a known protective mechanism against ischemia, while hyperthermia exacerbates damage.
Purpose of the Study:
- To investigate the specific effects of chronic Delta9-tetrahydrocannabinol (THC) administration on brain and body core temperatures in a rat model.
- To elucidate the role of temperature modulation in THC's observed neuroprotection.
Main Methods:
- Chronic administration of two doses of THC (0.1 mg/kg and 10 mg/kg) to rats for one week.
- Continuous monitoring of brain and body core temperatures using implanted probes throughout the treatment and a subsequent one-week washout period.
- Statistical analysis to determine the significance of temperature changes.
Main Results:
- Chronic THC administration significantly increased brain temperature in rats at both low and high doses (p < 0.0001).
- No significant alterations in body core temperature were observed following THC treatment (p = 0.4767).
- The observed increase in brain temperature persisted even after THC discontinuation.
Conclusions:
- Delta9-tetrahydrocannabinol (THC) selectively elevates brain temperature without affecting systemic body core temperature in rats.
- This selective hyperthermia may represent a key mechanism underlying THC's neuroprotective effects in ischemic conditions.
- Further research is warranted to explore the therapeutic implications of THC-induced brain temperature modulation.
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