Abstract
Rationale
Preclinical studies report attenuated ethanol-induced conditioned taste aversion (CTA) following chronic ethanol exposure, suggesting that tolerance develops to the aversive properties of ethanol. However, these studies are confounded by pre-exposure to the unconditioned stimulus (US; ethanol), which is well known to hinder conditioning.
Objectives
This study was designed to determine whether chronic ethanol exposure produces tolerance to the aversive properties of ethanol in the absence of a US pre-exposure confound.
Methods
CTA was performed in adult male and female Long-Evans rats by pairing 0.1% ingested saccharin with an intraperitoneal injection of ethanol (1.5 or 2.0 g/kg) or saline. Rats were then rendered ethanol dependent using chronic intermittent ethanol (CIE) vapor exposure. Controls were exposed to room air (AIR). The effect of chronic ethanol on CTA expression and reconditioning were examined following vapor exposure.
Results
Prior to vapor exposure, both sexes developed CTA to a comparable degree with 2.0 g/kg producing greater CTA than 1.5 g/kg ethanol. Following vapor exposure, AIR controls exhibited an increase in CTA magnitude compared to pre-vapor levels. This effect was largely absent in CIE-exposed rats. Re-conditioning after vapor exposure facilitated increased CTA magnitude to a similar degree in AIR- and CIE-exposed males. In contrast, CTA magnitude was unchanged by re-conditioning in females.
Conclusions
These data suggest that chronic ethanol does not facilitate tolerance to the aversive properties of ethanol but rather attenuates incubation of ethanol-induced CTA. Loss of CTA incubation suggests that CIE exposure disrupts circuits encoding aversion.
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Acknowledgements
The authors would like to thank the following lab members for technical assistance: Christen Amegashie, Alex Brown, Nidhi Chetan, Kacey Clayton-Stiglbauer, Karl Bosque-Cordero, Andres Gascon, Shikun Hou, Nikki Kinarasri, Autumn Ollice, Arleen Perez Ayala, Jacqueline Sanchez, Shree Srinivasan, and Shannon Wheeler.
Funding
This work was supported by NIH grants R01 AA029130 (EJG), P50 AA022538 (EJG), R00 AA024208 (EJG), T32 AA026577 (LAR; KRP).
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Ramirez, L.A., Przybysz, K.R., Pitock, J.R. et al. Attenuated incubation of ethanol-induced conditioned taste aversion in a model of dependence. Psychopharmacology (2024). https://doi.org/10.1007/s00213-024-06553-5
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DOI: https://doi.org/10.1007/s00213-024-06553-5