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Targeting neuroinflammation with minocycline in heavy drinkers

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Abstract

Rationale

Alcohol has both acute and chronic effects on neuroimmune signaling, including triggering pro-inflammatory cytokine release by microglia. Minocycline, a second-generation tetracycline antibiotic, inhibits microglial activation and reduces neuroinflammation in preclinical studies. In mice, minocycline also reduces ethanol intake, attenuates ethanol-induced conditioned place preference, and inhibits ethanol-induced microglial activation and pro-inflammatory cytokine release.

Objective

Here, for the first time, we tested the effects of minocycline on subjective response to ethanol and acute ethanol-induced inflammation in humans.

Methods

Forty-eight heavy drinkers participated in a double-blind, placebo-controlled trial in which they were randomized to receive placebo, 100 mg, or 200 mg of minocycline for 10 days. Each subject then underwent two experimental sessions in which they were given a fixed dose of intravenous ethanol using a “clamp” procedure (100 mg%) or placebo (normal saline) on days 8 and 10 of treatment.

Results

Minocycline was well tolerated, but there was no effect of either dose of minocycline on subjective response to ethanol or ethanol-induced craving; minocycline effects on cognitive function seem to interact with age. Minocycline treatment did not alter serum cytokine levels at baseline or during ethanol-exposure, although certain baseline cytokine levels predict sedative response to ethanol.

Conclusion

These findings indicate that a short-term treatment with minocycline may not alter ethanol-related inflammation or subjective response to ethanol in humans. Further research is needed to identify pharmacological agents with robust effects on ethanol-induced inflammation to determine whether neuroimmune modulation represents a viable treatment strategy for alcohol use disorder.

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Acknowledgments

Support was provided by NIAAA R21 AA023150 (PI Petrakis) and the VISN I Mental Illness Research Education and Clinical Center (MIRECC). We wished to thank the contributions of the Biostudies staff (Jane Weiner RN; Elizabeth O’Donnell RN; Angelina Genovese RNC, BSN, MBA; Margaret Dion-Marovitz MS, RN; Karen E. Prema RN, BSN).

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Correspondence to Ismene L. Petrakis.

Ethics declarations

Institutional review boards of the VA Connecticut Healthcare System and Yale University School of Medicine approved this study. The trial was also registered (ClinicalTrials.gov Identifier: NCT02187211).

Conflict of interest

Dr. Ismene L. Petrakis has served as a consultant for Alkermes over the past 3 years. Drs Elizabeth Ralevski, Ralitza Gueorguieva, Matthew E. Sloan, Lesley Devine, PhD, Gihyun Yoon, Albert J. Arias, and Mehmet Sofuoglu have no conflict of interest.

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This article belongs to a Special Issue on Neuroimmune Signaling in Psychiatric Disease.

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Petrakis, I.L., Ralevski, E., Gueorguieva, R. et al. Targeting neuroinflammation with minocycline in heavy drinkers. Psychopharmacology 236, 3013–3021 (2019). https://doi.org/10.1007/s00213-019-05205-3

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  • DOI: https://doi.org/10.1007/s00213-019-05205-3

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