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Updated: Jun 16, 2026
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Published on: August 1, 2025
Don't Sweat It: Cannabinoid CB1 Receptors Reduce Sweating in a Mouse Model
Natalia Murataeva1,2, Joseph Youkilis1, Yogith Rao1
1Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana, USA.
Summary
Cannabinoid CB1 receptors reduce sweating, according to a new study on mice. This finding suggests a potential link between cannabis use and altered sweating responses in humans.
Area of Science:
- Physiology
- Neuroscience
- Pharmacology
Background:
- Exocrine glands, including sweat glands, are vital for physiological functions like thermoregulation.
- Sweating disorders are prevalent and current therapies have limited efficacy.
- The cannabinoid signaling system is implicated in regulating other exocrine functions, suggesting a similar role in sweating.
Purpose of the Study:
- To investigate the role of the cannabinoid signaling system in regulating sweating.
- To explore the specific involvement of cannabinoid receptors (CB1 and CB2) in sweat gland function.
- To establish a reliable assay for measuring sweating in mice.
Main Methods:
- Development and application of a galvanic skin response-based assay in awake, unanesthetized mice.
- Administration of muscarinic agents (pilocarpine, glycopyrrolate) to validate the assay.
- Testing of cannabinoid receptor agonists (CP55940, THC, CBD) and analysis in wild-type and knockout mice (CB1, CB2).
- Immunohistochemical analysis to identify cannabinoid signaling components in mouse paw sweat glands.
Main Results:
- The assay successfully measured sweating, validated by pilocarpine and glycopyrrolate responses.
- Cannabinoid receptor agonist CP55940 significantly reduced sweating in wild-type and CB2 knockout mice, but not in CB1 knockout mice.
- Tetrahydrocannabinol (THC) reduced sweating, while cannabidiol (CBD) had no significant effect.
- Immunohistochemistry revealed CB1 receptors in periglandular cholinergic axons, NAPE-PLD in myoepithelial cells, and FAAH in acinar cells, indicating a local CB1/anandamide circuit.
Conclusions:
- Cannabinoid CB1 receptors play a significant role in reducing sweating.
- A local CB1/anandamide signaling pathway is present in mouse sweat glands.
- These findings suggest a potential mechanism for altered sweating in cannabis users.
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