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Evaluation of repeated or acute treatment with cannabidiol (CBD), cannabidiolic acid (CBDA) or CBDA methyl ester (HU-580) on nausea and/or vomiting in rats and shrews

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Abstract

Rationale

When acutely administered intraperitoneally, the non-psychoactive cannabinoid cannabidiol (CBD), its acidic precursor cannabidiolic acid (CBDA) and a stable methyl ester of CBDA (HU-580) reduce lithium chloride (LiCl)–induced conditioned gaping in male rats (a selective preclinical model of acute nausea) via activation of the serotonin 1A (5-HT1A) receptor.

Objectives

To utilise these compounds to manage nausea in the clinic, we must determine if their effectiveness is maintained when injected subcutaneously (s.c) and when repeatedly administered. First, we compared the effectiveness of each of these compounds to reduce conditioned gaping following repeated (7-day) and acute (1-day) pretreatments and whether these anti-nausea effects were mediated by the 5-HT1A receptor. Next, we assessed whether the effectiveness of these compounds can be maintained when administered prior to each of 4 conditioning trials (once per week). We also evaluated the ability of repeated CBD (7 days) to reduce LiCl-induced vomiting in Suncus murinus. Finally, we examined whether acute CBD was equally effective in male and female rats.

Results

Both acute and repeated (7 day) s.c. administrations of CBD (5 mg/kg), CBDA (1 μg/kg) and HU-580 (1 μg/kg) similarly reduced LiCl-induced conditioned gaping, and these effects were blocked by 5HT1A receptor antagonism. When administered over 4 weekly conditioning trials, the anti-nausea effectiveness of each of these compounds was also maintained. Repeated CBD (5 mg/kg, s.c.) maintained its anti-emetic efficacy in S. murinus. Acute CBD (5 and 20 mg/kg, s.c.) administration reduced LiCl-induced conditioned gaping similarly in male and female rats.

Conclusion

When administered repeatedly (7 days), CBD, CBDA and HU-580 did not lose efficacy in reducing nausea and continued to act via agonism of the 5-HT1A receptor. When administered across 4 weekly conditioning trials, they maintained their effectiveness in reducing LiCl-induced nausea. Repeated CBD also reduced vomiting in shrews. Finally, CBD’s anti-nausea effects were similar in male and female rats. This suggests that these cannabinoids may be useful anti-nausea and anti-emetic treatments for chronic conditions, without the development of tolerance.

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Abbreviations

5-HT1A :

Serotonin 1A

ANOVA :

Analysis of variance

CBD :

Cannabidiol

CBDA :

Cannabidiolic acid

CTA:

Conditioned taste avoidance

DRN :

Dorsal raphe nucleus

IIC :

Interceptive insular cortex

i.p. :

Intraperitoneal

LiCl :

Lithium chloride

SAL :

Saline

s.c. :

Subcutaneous

TR :

Taste reactivity

VEH :

Vehicle

WAY :

WAY100635

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Funding

The research described here was funded by research grants from the Natural Sciences and Engineering Council of Canada (NSERC: 03629) and Canadian Institutes of Health Research (CIHR: 388239).

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Correspondence to Linda A. Parker.

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The authors declare that they have no conflicts of interest.

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Rock, E.M., Sullivan, M.T., Collins, S.A. et al. Evaluation of repeated or acute treatment with cannabidiol (CBD), cannabidiolic acid (CBDA) or CBDA methyl ester (HU-580) on nausea and/or vomiting in rats and shrews. Psychopharmacology 237, 2621–2631 (2020). https://doi.org/10.1007/s00213-020-05559-z

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  • DOI: https://doi.org/10.1007/s00213-020-05559-z

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