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Calleja-Conde J, Echeverry-Alzate V, Bühler KM, Morales-García JÁ, Segovia-Rodríguez L, Durán-González P, Olmos P, de Fonseca FR, Giné E, López-Moreno JA. Dissecting operant alcohol self-administration using saccharin-fading procedure. Neuropsychopharmacol Rep 2023; 43:12-22. [PMID: 36727594 PMCID: PMC10009421 DOI: 10.1002/npr2.12289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 08/02/2022] [Accepted: 08/02/2022] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Although alcohol use disorder is a complex human pathology, the use of animal models represents an opportunity to study some aspects of this pathology. One of the most used paradigms to study the voluntary alcohol consumption in rodents is operant self-administration (OSA). AIMS In order to facilitate the performance of this paradigm, we aim to describe some critical steps of OSA under a saccharin-fading procedure. MATERIAL & METHODS We used 40 male Wistar rats to study the process of acquiring the operant response through a saccharin-fading procedure under a fixed ratio (FR1) schedule of reinforcement. Next, we analyze the alcohol introduction and concentration increase, the effect of an alcohol deprivation, and the analogy between this paradigm with the Drinking in the Dark-Multiple Scheduled Access paradigm. RESULTS During alcohol concentration increase, animals reduced their lever presses in accordance with the increase in alcohol concentration. On the contrary, the consumption measured in g·kg-1 BW showed a great stability. The lever presses pattern within operant session changes with the introduction of different alcohol concentrations: at higher alcohol concentrations, animals tended to accumulate most of their presses in the initial period of the session. DISCUSSION We show the utility of fading with low concentrations of saccharin and the evolution of the operant response through the different concentrations of alcohol. CONCLUSION Taken together, our results aimed to dissect the acquisition and maintenance of OSA behavior as well as other related variables, to facilitate the understanding and performance of this paradigm.
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Affiliation(s)
| | - Víctor Echeverry-Alzate
- School of Life and Nature Sciences, Nebrija University, Madrid, Spain.,Department of Psychobiology and Methodology in Behavioral Sciences, Faculty of Psychology, Somosaguas Campus, Complutense University of Madrid, Madrid, Spain.,IMABIS Foundation, Regenerative Medicine Laboratory, Carlos Haya Regional University Hospital, Málaga, Spain
| | - Kora-Mareen Bühler
- Department of Psychobiology and Methodology in Behavioral Sciences, Faculty of Psychology, Somosaguas Campus, Complutense University of Madrid, Madrid, Spain
| | | | - Lucía Segovia-Rodríguez
- Department of Psychobiology and Methodology in Behavioral Sciences, Faculty of Psychology, Somosaguas Campus, Complutense University of Madrid, Madrid, Spain
| | - Pedro Durán-González
- Department of Psychobiology and Methodology in Behavioral Sciences, Faculty of Psychology, Somosaguas Campus, Complutense University of Madrid, Madrid, Spain
| | - Pedro Olmos
- Center for Energy, Environmental and Technological Research (CIEMAT), Madrid, Spain
| | | | - Elena Giné
- Department of Cell Biology, Faculty of Medicine, Complutense University of Madrid, Madrid, Spain
| | - Jose Antonio López-Moreno
- Department of Psychobiology and Methodology in Behavioral Sciences, Faculty of Psychology, Somosaguas Campus, Complutense University of Madrid, Madrid, Spain
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Abstract
Alcohol is part of the usual diet of millions of individuals worldwide. However, not all individuals who drink alcohol experience the same effects, nor will everyone develop an alcohol use disorder. Here we propose that the intestinal microbiota (IMB) helps explain the different consumption patterns of alcohol among individuals. 507 humans participated in this study and alcohol consumption and IMB composition were analyzed. On the other hand, in 80 adult male Wistar rats, behavioral tests, alcohol intoxication, fecal transplantation, administration of antibiotics and collection of fecal samples were performed. For identification and relative quantification of bacterial taxa was used the bacterial 16 S ribosomal RNA gene. In humans, we found that heavy episodic drinking is associated with a specific stool type phenotype (type 1, according to Bristol Stool Scale; p < 0.05) and with an increase in the abundance of Actinobacteria (p < 0.05). Next, using rats, we demonstrate that the transfer of IMB from alcohol-intoxicated animals causes an increase in voluntary alcohol consumption in transplant-recipient animals (p < 0.001). The relative quantification data indicate that the genus Porphyromonas could be associated with the effect on voluntary alcohol consumption. We also show that gut microbiota depletion by antibiotics administration causes a reduction in alcohol consumption (p < 0.001) and altered the relative abundance of relevant phyla such as Firmicutes, Bacteroidetes or Cyanobacteria (p < 0.05), among others. Benjamini-Hochberg false discovery rate (FDR) correction was performed for multiple comparisons. These studies reveal some of the consequences of alcohol on the IMB and provide evidence that manipulation of IMB may alter voluntary alcohol consumption.
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Calleja-Conde J, Fernández-Calle R, Zapico JM, Ramos A, de Pascual-Teresa B, Bühler KM, Echeverry-Alzate V, Giné E, Rodríguez de Fonseca F, López-Moreno JA, Herradón G. Inhibition of Receptor Protein Tyrosine Phosphatase β/ζ Reduces Alcohol Intake in Rats. Alcohol Clin Exp Res 2020; 44:1037-1045. [PMID: 32154588 DOI: 10.1111/acer.14321] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 02/27/2020] [Indexed: 12/14/2022]
Abstract
BACKGROUND Pleiotrophin (PTN) and midkine (MK) are cytokines that are up-regulated in the prefrontal cortex (PFC) after alcohol administration and have been shown to reduce alcohol intake and reward. Both cytokines are endogenous inhibitors of receptor protein tyrosine phosphatase (RPTP) β/ζ (a.k.a. PTPRZ1). Recently, a new compound named MY10 was designed with the aim of mimicking the activity of PTN and MK. MY10 has already shown promising results regulating alcohol-related behaviors in mice. METHODS We have now tested the effects of MY10 on alcohol operant self-administration and Drinking In the Dark-Multiple Scheduled Access (DID-MSA) paradigms in rats. Gene expression of relevant genes in the PTN/MK signaling pathway in the PFC was analyzed by real-time PCR. RESULTS MY10, at the highest dose tested (100 mg/kg), reduced alcohol consumption in the alcohol operant self-administration paradigm (p = 0.040). In the DID-MSA paradigm, rats drank significantly less alcohol (p = 0.019) and showed a significant decrease in alcohol preference (p = 0.002). We observed that the longer the exposure to alcohol, the greater the suppressing effects of MY10 on alcohol consumption. It was demonstrated that the effects of MY10 were specific to alcohol since saccharin intake was not affected by MY10 (p = 0.804). MY10 prevented the alcohol-induced down-regulation of Ptprz1 (p = 0.004) and anaplastic lymphoma kinase (Alk; p = 0.013) expression. CONCLUSIONS Our results support and provide further evidence regarding the efficacy of MY10 on alcohol-related behaviors and suggest the consideration of the blockade of RPTPβ/ζ as a target for reducing excessive alcohol consumption.
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Affiliation(s)
- Javier Calleja-Conde
- From the, Department of Psychobiology and Behavioral Sciences Methods, (JC-C, K-MB, VE-A, JAL-M), School of Psychology, Complutense University of Madrid, Madrid, Spain
| | - Rosalía Fernández-Calle
- Departamento de Ciencias Farmacéuticas y de la Salud, (RF-C, GH), Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, Alcorcón, Spain
| | - José M Zapico
- Departamento de Química y Bioquímica, (JMZ, AR, BP-T), Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, Alcorcón, Spain
| | - Ana Ramos
- Departamento de Química y Bioquímica, (JMZ, AR, BP-T), Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, Alcorcón, Spain
| | - Beatriz de Pascual-Teresa
- Departamento de Química y Bioquímica, (JMZ, AR, BP-T), Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, Alcorcón, Spain
| | - Kora-Mareen Bühler
- From the, Department of Psychobiology and Behavioral Sciences Methods, (JC-C, K-MB, VE-A, JAL-M), School of Psychology, Complutense University of Madrid, Madrid, Spain
| | - Victor Echeverry-Alzate
- From the, Department of Psychobiology and Behavioral Sciences Methods, (JC-C, K-MB, VE-A, JAL-M), School of Psychology, Complutense University of Madrid, Madrid, Spain.,Laboratorio de Medicina Regenerativa, (VE-A, FRF), Hospital Regional Universitario Carlos Haya, Fundación IMABIS, Málaga, Spain
| | - Elena Giné
- Department of Cellular Biology, (EG), School of Medicine, Complutense University of Madrid, Madrid, Spain
| | - Fernando Rodríguez de Fonseca
- Laboratorio de Medicina Regenerativa, (VE-A, FRF), Hospital Regional Universitario Carlos Haya, Fundación IMABIS, Málaga, Spain
| | - Jose Antonio López-Moreno
- From the, Department of Psychobiology and Behavioral Sciences Methods, (JC-C, K-MB, VE-A, JAL-M), School of Psychology, Complutense University of Madrid, Madrid, Spain
| | - Gonzalo Herradón
- Departamento de Ciencias Farmacéuticas y de la Salud, (RF-C, GH), Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, Alcorcón, Spain
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