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Neddenriep B, Bagdas D, Contreras KM, Ditre JW, Wolstenholme JT, Miles MF, Damaj MI. Pharmacological mechanisms of alcohol analgesic-like properties in mouse models of acute and chronic pain. Neuropharmacology 2019; 160:107793. [PMID: 31562845 PMCID: PMC6924270 DOI: 10.1016/j.neuropharm.2019.107793] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 09/17/2019] [Accepted: 09/22/2019] [Indexed: 12/16/2022]
Abstract
Alcohol use and chronic pain are highly comorbid. Acute alcohol use typically produces an analgesic effect. However, chronic use can worsen the progression of chronic pain. In rodent models, acute models of pain have primarily been used to investigate the relationship between alcohol and pain analgesia. Here, we use two models of chronic pain, chronic inflammatory and peripheral neuropathic pain, to investigate acute alcohol's antinociceptive and analgesic properties. We hypothesize that acute ethanol is acting through opioid receptors to create an analgesic-like effect in both reflexive and affective dimensions of pain. Using male and female C57BL/6J mice, oral ethanol administration (0-1.25 g/kg) showed a dose-dependent reversal of mechanical hypersensitivity in both Complete Freund's Adjuvant (CFA) and chronic constriction injury (CCI) models of chronic inflammatory and neuropathic pain. No sex differences were observed. Using the conditioned place preference (CPP) task to assess the subjective responses to ethanol's anti-nociceptive properties, CCI-injured animals showed a preference for the ethanol-paired side, suggesting a reduction in an aversive and pain-like state produced by nerve injury. These effects are likely mediated through the kappa and possibly the mu opioid systems, since ethanol-induced anti-nociception following CCI was fully reversed by pretreatment with the kappa selective antagonist, nor-BNI, or high doses of naltrexone. These data show that ethanol possesses analgesic-like properties in chronic inflammatory and neuropathic pain models in mice and provide new insight into ethanol as it relates to chronic pain.
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Affiliation(s)
- Bradley Neddenriep
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Virginia Commonwealth University, Richmond, VA, 23298-0613, USA; Translational Research Initiative for Pain and Neuropathy, Virginia Commonwealth University, Virginia Commonwealth University, Richmond, VA, 23298-0613, USA
| | - Deniz Bagdas
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Virginia Commonwealth University, Richmond, VA, 23298-0613, USA; Translational Research Initiative for Pain and Neuropathy, Virginia Commonwealth University, Virginia Commonwealth University, Richmond, VA, 23298-0613, USA
| | - Katherine M Contreras
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Virginia Commonwealth University, Richmond, VA, 23298-0613, USA; Translational Research Initiative for Pain and Neuropathy, Virginia Commonwealth University, Virginia Commonwealth University, Richmond, VA, 23298-0613, USA
| | - Joseph W Ditre
- Department of Psychology, Syracuse University, Syracuse, NY, USA
| | - Jennifer T Wolstenholme
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Virginia Commonwealth University, Richmond, VA, 23298-0613, USA; VCU-Alcohol Research Center, Virginia Commonwealth University, Virginia Commonwealth University, Richmond, VA, 23298-0613, USA
| | - Michael F Miles
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Virginia Commonwealth University, Richmond, VA, 23298-0613, USA; VCU-Alcohol Research Center, Virginia Commonwealth University, Virginia Commonwealth University, Richmond, VA, 23298-0613, USA
| | - M Imad Damaj
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Virginia Commonwealth University, Richmond, VA, 23298-0613, USA; Translational Research Initiative for Pain and Neuropathy, Virginia Commonwealth University, Virginia Commonwealth University, Richmond, VA, 23298-0613, USA.
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