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Marcos A, Moreno M, Orihuel J, Ucha M, Mª de Paz A, Higuera-Matas A, Capellán R, Crego AL, Martínez-Larrañaga MR, Ambrosio E, Anadón A. The effects of combined intravenous cocaine and ethanol self-administration on the behavioral and amino acid profile of young adult rats. PLoS One 2020; 15:e0227044. [PMID: 32203565 PMCID: PMC7089423 DOI: 10.1371/journal.pone.0227044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 12/11/2019] [Indexed: 12/22/2022] Open
Abstract
Under paradigms of combined intravenous cocaine and ethanol self-administration, the effects on behavior have been poorly explored. Numerous studies have found sex differences in amino acids profile and behavioral responses to each drug, yet few have focused on the interactions between cocaine and ethanol. The main objective of this work was to explore the acquisition and maintenance of intravenous self-administration behavior with a combination of cocaine and ethanol in male and female young adult rats. Likewise, the amino acids profile in blood plasma was quantified 48 hours after the last self-administration session. Male and female 52 days old Wistar rats were randomly assigned to one of 3 groups: i) saline control, ii) cocaine (1 mg/kg bodyweight/injection) and iii) cocaine and ethanol (1 mg + 133 mg/kg bodyweight/ injection). After 24 self-administration sessions carried out on a fixed-ratio-1 schedule, with a limit of 15 doses per session, 14 plasma amino acids were quantified by mean Capillary Electrophoresis technique. The curve of cocaine and ethanol combined self-administration was similar to that associated with cocaine administration alone, with females acquiring self-administration criterion before males. The self-administration of cocaine and ethanol altered the plasma concentration and relative ratios of the amino acid L-Tyrosine. In our intravenous self-administration model, females appeared more vulnerable to acquire abusive consumption of the cocaine and ethanol combination, which altered plasma L-Tyrosine levels.
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Affiliation(s)
- Alberto Marcos
- Psychobiology Department, School of Psychology, Universidad Nacional de Educación a Distancia, Madrid, Spain
| | - Mario Moreno
- Psychobiology Department, School of Psychology, Universidad Nacional de Educación a Distancia, Madrid, Spain
| | - Javier Orihuel
- Psychobiology Department, School of Psychology, Universidad Nacional de Educación a Distancia, Madrid, Spain
| | - Marcos Ucha
- Psychobiology Department, School of Psychology, Universidad Nacional de Educación a Distancia, Madrid, Spain
| | - Ana Mª de Paz
- Departamento de Psicología Básica I, Facultad de Psicología, Universidad Nacional de Educación a Distancia (UNED), Madrid, Spain
| | - Alejandro Higuera-Matas
- Psychobiology Department, School of Psychology, Universidad Nacional de Educación a Distancia, Madrid, Spain
| | - Roberto Capellán
- Psychobiology Department, School of Psychology, Universidad Nacional de Educación a Distancia, Madrid, Spain
| | - Antonio L. Crego
- Departamento de Química Analítica, Química Física e Ingeniería Química, Facultad de Ciencias, Universidad de Alcalá, Ctra. Madrid-Barcelona, Alcalá de Henares, Madrid, Spain
| | - María-Rosa Martínez-Larrañaga
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Universidad Complutense de Madrid, Madrid, Spain
| | - Emilio Ambrosio
- Psychobiology Department, School of Psychology, Universidad Nacional de Educación a Distancia, Madrid, Spain
- * E-mail:
| | - Arturo Anadón
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Universidad Complutense de Madrid, Madrid, Spain
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