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Updated: Feb 4, 2026

Monitoring Cell-autonomous Circadian Clock Rhythms of Gene Expression Using Luciferase Bioluminescence Reporters
Published on: September 27, 2012
Cannabidiol affects circadian clock core complex and its regulation in microglia cells
Geneviève Lafaye1,2, Christophe Desterke3, Laurent Marulaz1,2
1Dpt Addictologie, AP-HP, GH Paris-Sud, Hôpital Paul Brousse, Villejuif, France.
Cannabidiol (CBD) disrupts circadian gene regulation in microglial cells, impacting sleep patterns. This cannabis component affects key genes like Arntl and Clock, unlike THC, aligning with therapeutic cannabis use for insomnia.
Area of Science:
- Neuroscience
- Pharmacology
- Chronobiology
Background:
- Cannabis is frequently used for sleep disorders, with potential impacts on circadian rhythm.
- Microglial cells, involved in psychiatric disorders and substance abuse, are implicated in cannabis's effects.
- Understanding cannabis components' effects on microglial circadian regulation is crucial.
Purpose of the Study:
- To investigate the impact of cannabidiol (CBD) and tetrahydrocannabinol (THC) on circadian gene regulation in microglial cells.
- To determine if CBD or THC affects the expression of key circadian rhythm genes in BV-2 microglial cells.
Main Methods:
- Exposure of BV-2 microglial cells to CBD and THC.
- Analysis of circadian gene expression (Arntl, Clock, CRY2, PER1) using quantitative methods.
- Confirmation of rhythmic gene expression in suprachiasmatic nucleus (SCN) and microglial cells.
Main Results:
- CBD significantly deregulated circadian genes in BV-2 cells, both with and without lipopolysaccharide stimulation (P < 0.05).
- CBD upregulated Arntl and CRY2, and downregulated Clock and PER1 in microglial cells (P < 0.05).
- THC did not show a similar deregulation of circadian rhythm in microglial cells.
Conclusions:
- CBD disrupts the circadian rhythm regulation in microglial cells.
- The observed effects of CBD on microglial circadian genes align with clinical observations of therapeutic cannabis for insomnia.
- THC does not appear to affect microglial circadian rhythm in the same manner as CBD.
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