Effects of ethanol on mechanical allodynia and dynamic weight bearing in male and female mice with spared nerve injury.

Autor: Nothem MA; Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania, USA., Wickman JR; Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania, USA.; Graduate Program in Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania, USA., Giacometti LL; Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania, USA., Barker JM; Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania, USA.
Jazyk: angličtina
Zdroj: Alcohol, clinical & experimental research [Alcohol Clin Exp Res (Hoboken)] 2023 Feb; Vol. 47 (2), pp. 382-394. Date of Electronic Publication: 2022 Dec 30.
DOI: 10.1111/acer.14997
Abstrakt: Background: Men and women with chronic pain report increased alcohol use and are more likely to be diagnosed with alcohol use disorder. The relationship between alcohol use and pain is bidirectional. Alcohol is used as an analgesic, but chronic alcohol intake increases pain. Sex differences in the relationship between chronic pain and alcohol are reported in the clinical and preclinical literature, but due to this bidirectional relationship, it is challenging to investigate the mechanisms that contribute to these differences. Thus, animal models of chronic pain are needed to characterize the efficacy of ethanol as an analgesic in males and females. The current experiments tested the hypothesis that ethanol differentially reduces pain behaviors in male and female mice in chronic neuropathic pain.
Methods: The spared nerve injury (SNI) model was used to investigate the analgesic effects of multiple doses of ethanol (0.5, 1, 2, g/kg i.p.) in male and female mice using von Frey and dynamic weight-bearing (DWB) assays.
Results: In both male and female mice, SNI led to robust allodynia and shifts in dynamic weight bearing. In male SNI mice, all three doses of ethanol fully reversed mechanical allodynia and shifts in DWB. In SNI females, only the highest dose (2.0 g/kg) was fully antiallodynic in the von Frey assay, while shifts in weight bearing were reversed at the 1.0 and 2.0 g/kg doses. The differences between male and females were not due to lower blood ethanol concentrations in female mice.
Conclusion: These data indicate that while ethanol has antiallodynic and antinociceptive effects in male and female mice, the doses and time course of these effects are distinct. Studies investigating the relationship between pain and ethanol exposure in mice should consider sex as a key variable. These data also inform reported sex differences in rodent models of chronic pain and in chronic pain patients.
(© 2022 Research Society on Alcohol.)
Databáze: MEDLINE
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