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Acute naloxone-precipitated morphine withdrawal elicits nausea-like somatic behaviors in rats in a manner suppressed by N-oleoylglycine

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Abstract

Rationale

Acute naloxone-precipitated morphine withdrawal (MWD) produces a conditioned place aversion (CPA) in rats even after one or two exposures to high-dose (20 mg/kg, sc) morphine followed 24-h later by naloxone (1 mg/kg, sc). However, the somatic withdrawal reactions produced by acute naloxone-precipitated MWD in rats have not been investigated. A recently discovered fatty acid amide, N-oleoylglycine (OlGly), which has been suggested to act as a fatty acid amide hydrolase (FAAH) inhibitor and as a peroxisome proliferator-activated receptor alpha (PPARα) agonist, was previously shown to interfere with a naloxone-precipitated MWD-induced CPA in rats.

Objectives

The aims of these studies were to examine the somatic withdrawal responses produced by acute naloxone-precipitated MWD and determine whether OlGly can also interfere with these responses.

Results

Here, we report that following two exposures to morphine (20 mg/kg, sc) each followed by naloxone (1 mg/kg, sc) 24 h later, rats display nausea-like somatic reactions of lying flattened on belly, abdominal contractions and diarrhea, and display increased mouthing movements and loss of body weight. OlGly (5 mg/kg, ip) interfered with naloxone-precipitated MWD-induced abdominal contractions, lying on belly, diarrhea and mouthing movements in male Sprague–Dawley rats, by both a cannabinoid 1 (CB1) and a PPARα mechanism of action. Since these withdrawal reactions are symptomatic of nausea, we evaluated the potential of OlGly to interfere with lithium chloride (LiCl)-induced and MWD-induced conditioned gaping in rats, a selective measure of nausea; the suppression of MWD-induced gaping reactions by OlGly was both CB1 and PPARα mediated.

Conclusion

These results suggest that the aversive effects of acute naloxone-precipitated MWD reflect nausea, which is suppressed by OlGly.

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Abbreviations

AEA:

anandamide

AM:

AM251

ANOVA:

analysis of variance

CB1 :

cannabinoid 1

CB2 :

cannabinoid 2

CPA:

conditioned place aversion

FAAH:

fatty acid amide hydrolase

ip:

intraperitoneal

LiCl:

lithium chloride

LOB:

lying on belly

M:

morphine

MK:

MK886

MWD:

morphine withdrawal

N:

naloxone

OEA:

N-oleoylethanolamide

OlGly:

N-oleoylglycine

PEA:

N-palmitoylethanolamide

PPARα:

peroxisome proliferator-activated receptor alpha

S:

saline

sc:

subcutaneous

TR:

taste reactivity

VEH:

vehicle

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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), Canadian Institutes of Health Research (CIHR:388239) and a research contract from PlantExt to Linda A Parker.

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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., Ayoub, S.M., Limebeer, C.L. et al. Acute naloxone-precipitated morphine withdrawal elicits nausea-like somatic behaviors in rats in a manner suppressed by N-oleoylglycine. Psychopharmacology 237, 375–384 (2020). https://doi.org/10.1007/s00213-019-05373-2

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  • DOI: https://doi.org/10.1007/s00213-019-05373-2

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