A Compound That Boosts Anandamide and Blocks TRPV1 Promoted Sleep in Rats
N-arachidonoyl-serotonin (AA-5-HT) increased sleep during the active period in rats, enhanced sleep recovery after deprivation, and blocked the wake-promoting effects of CBD and modafinil.
Quick Facts
What This Study Found
This study demonstrated that AA-5-HT, a dual FAAH inhibitor and TRPV1 blocker, is a potent sleep modulator in rats.
When injected during the dark (active) period, AA-5-HT decreased wakefulness and increased both slow wave sleep and REM sleep in a dose-dependent manner. Interestingly, the same doses had no effect during the light (rest) period, when rats naturally sleep more.
AA-5-HT also blocked the wake-promoting effects of two stimulants: CBD and modafinil. When rats were given CBD or modafinil during their normal sleep period, AA-5-HT prevented the resulting increase in wakefulness and allowed normal sleep to occur.
In sleep homeostasis experiments, CBD and modafinil prevented normal sleep rebound after total sleep deprivation. AA-5-HT blocked this effect, allowing proper sleep recovery. AA-5-HT also reduced wake-related neurotransmitters (dopamine, norepinephrine, epinephrine, serotonin) while increasing adenosine, a key sleep-promoting molecule.
Key Numbers
Three doses: 5, 10, 20 mg/kg. Effects seen only during dark period. AA-5-HT decreased dopamine, norepinephrine, epinephrine, serotonin and increased adenosine. Blocked wake-promoting effects of both CBD and modafinil.
How They Did This
Rats received AA-5-HT (5, 10, or 20 mg/kg i.p.) during lights-on or lights-off periods. Sleep-wake states were recorded via EEG/EMG. Power spectral analysis assessed sleep quality. Neurotransmitter levels were measured. Interactions with CBD and modafinil were tested during both normal conditions and after total sleep deprivation.
Why This Research Matters
This study identifies AA-5-HT as a sleep-promoting agent that works through the endocannabinoid system. Its ability to enhance sleep specifically during active periods (without over-sedating during rest) and to restore sleep homeostasis after deprivation suggests therapeutic potential for insomnia.
The Bigger Picture
The finding that CBD is wake-promoting (and that AA-5-HT blocks this effect) adds nuance to the popular perception of CBD as a sleep aid. CBD may actually promote wakefulness, while the sleep-promoting effects of the endocannabinoid system may work through anandamide enhancement and TRPV1 blockade.
What This Study Doesn't Tell Us
Animal study with intraperitoneal injection, not a clinically viable route. The interaction between AA-5-HT and CBD/modafinil is complex and may not translate directly to human pharmacology. Sleep architecture differs between rats and humans.
Questions This Raises
- ?Could AA-5-HT or similar compounds be developed as sleep medications?
- ?Does this finding explain why some people report better sleep with cannabis while others feel more alert?
- ?Would oral AA-5-HT or related compounds be effective in human insomnia?
Trust & Context
- Key Stat:
- AA-5-HT promoted sleep and blocked the wake-promoting effects of CBD
- Evidence Grade:
- Comprehensive animal pharmacology study with multiple experimental paradigms. Preliminary because findings require human translation.
- Study Age:
- Published in 2017.
- Original Title:
- Role of N-Arachidonoyl-Serotonin (AA-5-HT) in Sleep-Wake Cycle Architecture, Sleep Homeostasis, and Neurotransmitters Regulation.
- Published In:
- Frontiers in molecular neuroscience, 10, 152 (2017)
- Authors:
- Murillo-Rodríguez, Eric(2), Di Marzo, Vincenzo(23), Machado, Sergio, Rocha, Nuno B, Veras, André B, Neto, Geraldo A M, Budde, Henning, Arias-Carrión, Oscar, Arankowsky-Sandoval, Gloria
- Database ID:
- RTHC-01461
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Does CBD help you sleep?
Surprisingly, this study found CBD actually promotes wakefulness in rats. The sleep-promoting effects of the endocannabinoid system may work through different mechanisms (anandamide enhancement, TRPV1 blockade) rather than through CBD itself.
Could the endocannabinoid system be targeted for insomnia?
This study suggests yes. AA-5-HT promoted sleep specifically during active periods and restored normal sleep recovery after deprivation, making endocannabinoid-targeted compounds potential candidates for sleep medication development.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-01461APA
Murillo-Rodríguez, Eric; Di Marzo, Vincenzo; Machado, Sergio; Rocha, Nuno B; Veras, André B; Neto, Geraldo A M; Budde, Henning; Arias-Carrión, Oscar; Arankowsky-Sandoval, Gloria. (2017). Role of N-Arachidonoyl-Serotonin (AA-5-HT) in Sleep-Wake Cycle Architecture, Sleep Homeostasis, and Neurotransmitters Regulation.. Frontiers in molecular neuroscience, 10, 152. https://doi.org/10.3389/fnmol.2017.00152
MLA
Murillo-Rodríguez, Eric, et al. "Role of N-Arachidonoyl-Serotonin (AA-5-HT) in Sleep-Wake Cycle Architecture, Sleep Homeostasis, and Neurotransmitters Regulation.." Frontiers in molecular neuroscience, 2017. https://doi.org/10.3389/fnmol.2017.00152
RethinkTHC
RethinkTHC Research Database. "Role of N-Arachidonoyl-Serotonin (AA-5-HT) in Sleep-Wake Cyc..." RTHC-01461. Retrieved from https://rethinkthc.com/research/murillo-rodriguez-2017-role-of-narachidonoylserotonin-aa5ht
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.