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Anunziata F, Macchione AF, Alcalde AA, Tejerina DN, Amigone JL, Wille-Bille A, Trujillo V, Molina JC. Ethanol's disruptive effects upon early breathing plasticity and blood parameters associated with hypoxia and hypercapnia. Exp Neurol 2021; 344:113796. [PMID: 34224736 DOI: 10.1016/j.expneurol.2021.113796] [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: 04/15/2021] [Revised: 06/16/2021] [Accepted: 07/01/2021] [Indexed: 10/20/2022]
Abstract
Early ethanol exposure affects respiratory neuroplasticity; a risk factor associated with the Sudden Infant Death Syndrome. High and chronic ethanol doses exert long-lasting effects upon respiratory rates, apneic episodes and ventilatory processes triggered by hypoxia. The present study was performed in 3-9-day-old rat pups. Respiratory processes under normoxic and hypoxic conditions were analyzed in pups intoxicated with different ethanol doses which were pre-exposed or not to the drug. A second major goal was to examine if acute and/or chronic early ethanol exposure affects blood parameters related with hypercapnic or hypoxic states. In Experiment 1, at postnatal day 9, animals previously treated with ethanol (2.0 g/kg) or vehicle (0.0 g/kg) were tested sober or intoxicated with 0.75, 1.37 or 2.00 g/kg ethanol. The test involved sequential air conditions defined as initial normoxia, hypoxia and recovery normoxia. Motor activity was also evaluated. In Experiment 2, blood parameters indicative of possible hypoxic and hypercapnic states were assessed as a function of early chronic or acute experiences with the drug. The main results of Experiment 1 were as follows: i) ethanol's depressant effects upon respiratory rates increased as a function of sequential treatment with the drug (sensitization); ii) ethanol inhibited apneic episodes even when employing the lowest dose at test (0.75 g/kg); iii) the hyperventilatory response caused by hypoxia negatively correlated with the ethanol dose administered at test; iv) ventilatory long-term facilitation (LTF) during recovery normoxia was observed in pups pre-exposed to the drug and in pups that received the different ethanol doses at test; v) self-grooming increased in pups treated with either 1.37 or 2.00 g/kg ethanol. The main result of Experiment 2 indicated that acute as well as chronic ethanol exposure results in acidosis-hypercapnia. The results indicate that early and brief experiences with ethanol are sufficient to affect different respiratory plasticity processes as well as blood biomarkers indicative of acidosis-hypercapnia. An association between the LTF process and the acidosis-hypercapnic state caused by ethanol seems to exist. The mentioned experiences with the drug are sufficient to result in an anomalous programming of respiratory patterns and metabolic conditions.
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Affiliation(s)
- Florencia Anunziata
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET- Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Ana F Macchione
- Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, Argentina; Instituto de Investigaciones Psicológicas, IIPsi-CONICET-Universidad Nacional de Córdoba, Córdoba, Argentina.
| | - Asier Angulo Alcalde
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET- Universidad Nacional de Córdoba, Córdoba, Argentina; Departamento de Procesos Psicológicos Básicos y su Desarrollo, Facultad de Psicología, Universidad del País Vasco UPV-EHU, Donostia-San Sebastián, Guipúzcoa, Spain
| | - David N Tejerina
- Laboratorio de Bioquímica Clínica, Hospital Privado de Córdoba, Córdoba, Argentina
| | - José L Amigone
- Laboratorio de Bioquímica Clínica, Hospital Privado de Córdoba, Córdoba, Argentina
| | - Aranza Wille-Bille
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET- Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Verónica Trujillo
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET- Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Juan C Molina
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET- Universidad Nacional de Córdoba, Córdoba, Argentina; Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, Argentina.
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2
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Asiedu B, Nyakudya TT, Lembede BW, Chivandi E. Early-life exposure to alcohol and the risk of alcohol-induced liver disease in adulthood. Birth Defects Res 2021; 113:451-468. [PMID: 33577143 DOI: 10.1002/bdr2.1881] [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: 08/25/2020] [Revised: 01/13/2021] [Accepted: 01/19/2021] [Indexed: 11/10/2022]
Abstract
Alcohol consumption remains prevalent among pregnant and nursing mothers despite the well-documented adverse effects this may have on the offspring. Moderate-to-high levels of alcohol consumption in pregnancy result in fetal alcohol syndrome (FAS) disorders, with brain defects being chief among the abnormalities. Recent findings indicate that while light-to-moderate levels may not cause FAS, it may contribute to epigenetic changes that make the offspring prone to adverse health outcomes including metabolic disorders and an increased propensity in the adolescent-onset of drinking alcohol. On the one hand, prenatal alcohol exposure (PAE) causes epigenetic changes that affect lipid and glucose transcript regulating genes resulting in metabolic abnormalities. On the other hand, it can program offspring for increased alcohol intake, enhance its palatability, and increase acceptance of alcohol's flavor through associative learning, making alcohol a plausible second hit for the development of alcohol-induced liver disease. Adolescent drinking results in alcohol dependence and abuse in adulthood. Adolescent drinking results in alcohol dependence and abuse in adulthood. Alterations on the opioid system, particularly, the mu-opioid system, has been implicated in the mechanism that induces increased alcohol consumption and acceptance. This review proposes a mechanism that links PAE to the development of alcoholism and eventually to alcoholic liver disease (ALD), which results from prolonged alcohol consumption. While PAE may not lead to ALD development in childhood, there are chances that it may lead to ALD in adulthood.
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Affiliation(s)
- Bernice Asiedu
- Faculty of Health Sciences, School of Physiology, University of the Witwatersrand, Johannesburg, South Africa
| | - Trevor Tapiwa Nyakudya
- Department of Physiology, Faculty of Health Sciences, School of Medicine, University of Pretoria, Gezina, South Africa
| | - Busisani Wiseman Lembede
- Faculty of Health Sciences, School of Physiology, University of the Witwatersrand, Johannesburg, South Africa
| | - Eliton Chivandi
- Faculty of Health Sciences, School of Physiology, University of the Witwatersrand, Johannesburg, South Africa
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3
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Co-existence of ethanol-related respiratory and motivational learning processes based on a tactile discrimination procedure in neonatal rats. Alcohol 2020; 85:65-76. [PMID: 31734305 DOI: 10.1016/j.alcohol.2019.11.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 11/04/2019] [Accepted: 11/04/2019] [Indexed: 01/08/2023]
Abstract
In rats, high ethanol doses during early postnatal life exert deleterious effects upon brain development that impact diverse social and cognitive abilities. This stage in development partially overlaps with the third human gestational trimester, commonly referred to as the brain growth spurt period. At this stage in development, human fetuses and rat neonates (postnatal days [PD] 3-9) exhibit relatively high respiratory rates that are affected by subteratogenic ethanol doses. Recent studies suggest conditioned breathing responses in the developing organism, given that there are explicit associations between exteroceptive stimuli and the state of ethanol intoxication. Furthermore, studies performed with near-term rat fetuses suggest heightened sensitivity to ethanol's motivational effects. The present study was meant to analyze the unconditioned effects of ethanol intoxication and the possible co-occurrence of learning mechanisms that can impact respiratory plasticity, and to analyze the preference for cues that signal the state of intoxication as well as the effects of the drug, related with motor stimulation. Neonatal rats were subjected to differential experiences with salient tactile cues explicitly paired or not paired with the effects of vehicle or ethanol (2.0 g/kg). A tactile discrimination procedure applied during PDs 3, 5, 7, and 9 allowed the identification of the emergence of ethanol-derived non-associative and associative learning processes that affect breathing plasticity, particularly when considering apneic disruptions. Ethanol was found to partially inhibit the disruptions that appeared to be intimately related with stressful circumstances defined by the experimental procedure. Tactile cues paired with the drug's effects were also observed to exert an inhibitory effect upon these breathing disruptions. The level of contingency between a given tactile cue and ethanol intoxication also resulted in significant changes in the probability of seeking this cue in a tactile preference test. In addition, the state of intoxication exerted motor-stimulating effects. When contrasting the data obtained via the analysis of the different dependent variables, it appears that most ethanol-derived changes are modulated by positive and/or negative (anti-anxiety) reinforcing effects of the drug. As a whole, the study indicates co-existence of ethanol-related functional changes in the developing organism that simultaneously affect respiratory plasticity and preference patterns elicited by stimuli that signal ethanol's motivational effects. These results emphasize the need to consider significant alterations due to minimal ethanol experiences that argue against "safe" levels of exposure in a critical stage in brain development.
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Guttlein L, Macchione AF, Hernández-Fonseca K, Haymal OB, Molina JC, Méndez Ubach M, Abate P. Maternal manipulation during late gestation (GDs 17-20) enhances ethanol consumption and promotes changes and opioid mRNA expression in infant rats. Behav Brain Res 2019; 368:111908. [PMID: 30986490 DOI: 10.1016/j.bbr.2019.111908] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 04/09/2019] [Accepted: 04/11/2019] [Indexed: 12/17/2022]
Abstract
Fetal ethanol experience generates learning and memories capable to increase ethanol consummatory behaviors during infancy. Opioid system seems to be involved in mediating those alcohol-related behaviors. In this work, we proposed to study the impact of prenatal exposure to a moderate ethanol dose, upon ingestion of the drug and possible ethanol-induced molecular changes on opioid precursor peptides (POMC, Pro-enk and Pro-DYN) and receptors (MOR, DOR and KOR) mRNA expression, in hypothalamus. Pregnant rats received during gestational days (GDs) 17-20, a daily intragastric (i.g.) administration with 2g/kg ethanol or water. A third group of dams was left undisturbed during pregnancy (Unmanipulated group). Intake test was conducted at postnatal days (PDs) 14-15. Three groups of pups were performed: control (no intake test), water (vehicle) and 5% ethanol. At the end of intake test blood samples were taken to quantify blood ethanol concentrations (BECs) and hypothalamus sections were obtained to perform qRT-PRC assessment of opioid precursor peptides and receptors. The analysis of the consummatory responses (% of consumption) and pharmacokinetic profiles (BECs) suggested that maternal manipulation induced by i.g. intubations, during the last four days of gestation (whenever ethanol or water), are sufficient to induce infantile ethanol intake during infancy. Gene expression from the hypothalamus of unmanipulated group revealed that infantile ingestive experiences with ethanol can down-regulate expression of mRNA Pro-Dyn and up-regulate mRNA expression of MOR and KOR. Finally, MOR mRNA expression was attenuated by prenatal i.g. manipulation in pups exposed to 5% ethanol.
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Affiliation(s)
- Larisa Guttlein
- Instituto de Investigación Médica M. y M. Ferreyra, INIMEC-CONICET-Universidad Nacional de Córdoba, Córdoba, C.P. 5016, Argentina
| | - Ana Fabiola Macchione
- Instituto de Investigación Médica M. y M. Ferreyra, INIMEC-CONICET-Universidad Nacional de Córdoba, Córdoba, C.P. 5016, Argentina; Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, C.P. 5000, Argentina
| | - Karla Hernández-Fonseca
- Departamento de Neuroquímica, Subdirección de Investigaciones Clínicas, Instituto Nacional de Psiquiatría Ramón de la Fuente, Calzada México Xochimilco 101, Col. San Lorenzo Huipulco, 14370 México D.F., Mexico
| | - Olga Beatriz Haymal
- Instituto de Investigación Médica M. y M. Ferreyra, INIMEC-CONICET-Universidad Nacional de Córdoba, Córdoba, C.P. 5016, Argentina
| | - Juan Carlos Molina
- Instituto de Investigación Médica M. y M. Ferreyra, INIMEC-CONICET-Universidad Nacional de Córdoba, Córdoba, C.P. 5016, Argentina; Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, C.P. 5000, Argentina
| | - Milagros Méndez Ubach
- Departamento de Neuroquímica, Subdirección de Investigaciones Clínicas, Instituto Nacional de Psiquiatría Ramón de la Fuente, Calzada México Xochimilco 101, Col. San Lorenzo Huipulco, 14370 México D.F., Mexico.
| | - Paula Abate
- Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, C.P. 5000, Argentina; Instituto de Investigaciones Psicológicas (IIPsi-CONICET-UNC), Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, C.P. 5000, Argentina.
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5
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Macchione AF, Anunziata F, Haymal BO, Abate P, Molina JC. Brief ethanol exposure and stress-related factors disorganize neonatal breathing plasticity during the brain growth spurt period in the rat. Psychopharmacology (Berl) 2018; 235:983-998. [PMID: 29464303 DOI: 10.1007/s00213-017-4815-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 12/13/2017] [Indexed: 12/24/2022]
Abstract
RATIONALE The effects of early ethanol exposure upon neonatal respiratory plasticity have received progressive attention given a multifactorial perspective related with sudden infant death syndrome or hypoxia-associated syndromes. The present preclinical study was performed in 3-9-day-old pups, a stage in development characterized by a brain growth spurt that partially overlaps with the 3rd human gestational trimester. METHODS Breathing frequencies and apneas were examined in pups receiving vehicle or a relatively moderate ethanol dose (2.0 g/kg) utilizing a whole body plethysmograph. The experimental design also considered possible associations between drug administration stress and exteroceptive cues (plethysmographic context or an artificial odor). Ethanol exposure progressively exerted a detrimental effect upon breathing frequencies. A test conducted at PD9 when pups were under the state of sobriety confirmed ethanol's detrimental effects upon respiratory plasticity (breathing depression). RESULTS Pre-exposure to the drug also resulted in a highly disorganized respiratory response following a hypoxic event, i.e., heightened apneic episodes. Associative processes involving drug administration procedures and placement in the plethysmographic context also affected respiratory plasticity. Pups that experienced intragastric administrations in close temporal contiguity with such a context showed diminished hyperventilation during hypoxia. In a 2nd test conducted at PD9 while pups were intoxicated and undergoing hypoxia, an attenuated hyperventilatory response was observed. In this test, there were also indications that prior ethanol exposure depressed breathing frequencies during hypoxia and a recovery normoxia phase. CONCLUSION As a whole, the results demonstrated that brief ethanol experience and stress-related factors significantly disorganize respiratory patterns as well as arousal responses linked to hypoxia in neonatal rats.
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Affiliation(s)
- A F Macchione
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET-Universidad Nacional de Córdoba, Friuli 2434, 5016, Córdoba, Argentina.,Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - F Anunziata
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET-Universidad Nacional de Córdoba, Friuli 2434, 5016, Córdoba, Argentina
| | - B O Haymal
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET-Universidad Nacional de Córdoba, Friuli 2434, 5016, Córdoba, Argentina
| | - P Abate
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET-Universidad Nacional de Córdoba, Friuli 2434, 5016, Córdoba, Argentina.,Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - J C Molina
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET-Universidad Nacional de Córdoba, Friuli 2434, 5016, Córdoba, Argentina. .,Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, Argentina. .,Center for Development and Behavioral Neuroscience, Binghamton University, Binghamton, NY, USA.
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6
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Acevedo MB, D'Aloisio G, Haymal OB, Molina JC. Brain Acetaldehyde Exposure Impacts upon Neonatal Respiratory Plasticity and Ethanol-Related Learning in Rodents. Front Behav Neurosci 2017; 11:39. [PMID: 28377702 PMCID: PMC5359529 DOI: 10.3389/fnbeh.2017.00039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 02/23/2017] [Indexed: 01/14/2023] Open
Abstract
Prior studies indicate that neonates are very sensitive to ethanol's positive reinforcing effects and to its depressant effects upon breathing. Acetaldehyde (ACD) appears to play a major role in terms of modulating early reinforcing effects of the drug. Yet, there is no pre-existing literature relative to the incidence of this metabolite upon respiratory plasticity. The present study analyzed physiological and behavioral effects of early central administrations of ethanol, acetaldehyde or vehicle. Respiration rates (breaths/min) were registered at post-natal days (PDs) 2 and 4 (post-administration time: 5, 60, or 120 min). At PD5, all pups were placed in a context (plethysmograph) where they had previously experienced the effects of central administrations and breathing patterns were recorded. Following this test, pups were evaluated using and operant conditioning procedure where ethanol or saccharin served as positive reinforcers. Body temperatures were also registered prior to drug administrations as well as at the beginning and the end of each specific evaluation. Across days, breathing responses were high at the beginning of the evaluation session and progressively declined as a function of the passage of time. At PDs 2 and 4, shortly after central administration (5 min), ACD exerted a significant depression upon respiration frequencies. At PD5, non-intoxicated pups with a prior history of ACD central administrations, exhibited a marked increase in respiratory frequencies; a result that probably indicates a conditioned compensatory response. When operant testing procedures were conducted, prior ethanol or ACD central administrations were found to reduce the reinforcing effects of ethanol. This was not the case when saccharin was employed as a reinforcer. As a whole, the results indicate a significant role of central ACD upon respiratory plasticity of the neonate and upon ethanol's reinforcing effects; phenomena that affect the physiological integrity of the immature organism and its subsequent affinity for ethanol operationalized through self-administration procedures.
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Affiliation(s)
- María B Acevedo
- Laboratorio de Alcohol, Ontogenia y Aprendizaje, Instituto de Investigación Médica Mercedes y Martín Ferreyra, Consejo Nacional de Investigaciones Científicas y Técnicas (INIMEC-CONICET), Universidad Nacional de Córdoba Córdoba, Argentina
| | - Génesis D'Aloisio
- Laboratorio de Alcohol, Ontogenia y Aprendizaje, Instituto de Investigación Médica Mercedes y Martín Ferreyra, Consejo Nacional de Investigaciones Científicas y Técnicas (INIMEC-CONICET), Universidad Nacional de CórdobaCórdoba, Argentina; Experimental Psychobiology Chair, Department of Psychology, Universidad Nacional de CórdobaCórdoba, Argentina
| | - Olga B Haymal
- Laboratorio de Alcohol, Ontogenia y Aprendizaje, Instituto de Investigación Médica Mercedes y Martín Ferreyra, Consejo Nacional de Investigaciones Científicas y Técnicas (INIMEC-CONICET), Universidad Nacional de Córdoba Córdoba, Argentina
| | - Juan C Molina
- Laboratorio de Alcohol, Ontogenia y Aprendizaje, Instituto de Investigación Médica Mercedes y Martín Ferreyra, Consejo Nacional de Investigaciones Científicas y Técnicas (INIMEC-CONICET), Universidad Nacional de CórdobaCórdoba, Argentina; Experimental Psychobiology Chair, Department of Psychology, Universidad Nacional de CórdobaCórdoba, Argentina
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7
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Acevedo MB, Macchione AF, Anunziata F, Haymal OB, Molina JC. Neonatal experiences with ethanol intoxication modify respiratory and thermoregulatory plasticity and affect subsequent ethanol intake in rats. Dev Psychobiol 2016; 59:48-59. [PMID: 27540704 DOI: 10.1002/dev.21466] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 08/05/2016] [Indexed: 12/16/2022]
Abstract
Different studies have focused on the deleterious consequences of binge-like or chronic exposure to ethanol during the brain growth spurt period (third human gestational trimester) that in the rat corresponds to postnatal days (PDs) 3-10. The present study analyzed behavioral and physiological disruptions caused by relatively brief binge-like exposures (PDs 3, 5, and 7) with an ethanol dose lower (3.0 g/kg) than those frequently employed to examine teratological effects during this stage in development. At PD 9, pups were exposed to ethanol doses ranging between .0-3.0 g/kg and tested in terms of breathing patterns and thermoregulation. At PDs 11 and 12, ethanol intake was examined. The main findings were as follows: i) pre-exposure to the drug resulted in brief depressions in breathing frequencies and an exacerbated predisposition toward apneic episodes; ii) these effects were not dependent upon thermoregulatory alterations; iii) early ethanol treatment increased initial consumption of the drug which also caused a marked hypothermia that appeared to regulate a subsequent decrement in ethanol consumption; and iv) ethanol exposure retarded overall body growth and even one exposure to the drug (PD 9) was sufficient to reduce brain weights although there were no indications of microcephaly. In conjunction with studies performed during the late gestational period in the rat, the results indicate that relatively brief binge-like episodes during a critical window of brain vulnerability disrupts the respiratory network and exacerbates initial acceptance of the drug. In addition, ethanol treatments were not found to induce tolerance relative to respiratory and thermal disruptions.
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Affiliation(s)
- María Belén Acevedo
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET- Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Ana Fabiola Macchione
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET- Universidad Nacional de Córdoba, Córdoba, Argentina.,Facultad de Odontología, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Florencia Anunziata
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET- Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Olga Beatriz Haymal
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET- Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Juan Carlos Molina
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET- Universidad Nacional de Córdoba, Córdoba, Argentina.,Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, Argentina
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8
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Macchione AF, Anunziata F, Culleré ME, Haymal BO, Spear N, Abate P, Molina JC. Conditioned breathing depression during neonatal life as a function of associating ethanol odor and the drug's intoxicating effects. Dev Psychobiol 2016; 58:670-86. [DOI: 10.1002/dev.21398] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 02/03/2016] [Indexed: 01/27/2023]
Affiliation(s)
- A. F. Macchione
- Instituto de Investigación Médica Mercedes y Martín Ferreyra; INIMEC-CONICET-Universidad Nacional de Córdoba; Friuli 2434 Córdoba 5016 Argentina
- Facultad de Odontología; Universidad Nacional de Córdoba; Córdoba Argentina
| | - F. Anunziata
- Instituto de Investigación Médica Mercedes y Martín Ferreyra; INIMEC-CONICET-Universidad Nacional de Córdoba; Friuli 2434 Córdoba 5016 Argentina
| | - M. E. Culleré
- Instituto de Investigación Médica Mercedes y Martín Ferreyra; INIMEC-CONICET-Universidad Nacional de Córdoba; Friuli 2434 Córdoba 5016 Argentina
| | - B. O. Haymal
- Instituto de Investigación Médica Mercedes y Martín Ferreyra; INIMEC-CONICET-Universidad Nacional de Córdoba; Friuli 2434 Córdoba 5016 Argentina
| | - N. Spear
- Center for Development and Behavioral Neuroscience; Binghamton University; Binghamton NY
| | - P. Abate
- Instituto de Investigación Médica Mercedes y Martín Ferreyra; INIMEC-CONICET-Universidad Nacional de Córdoba; Friuli 2434 Córdoba 5016 Argentina
- Facultad de Psicología; Universidad Nacional de Córdoba; Córdoba Argentina
| | - J. C. Molina
- Instituto de Investigación Médica Mercedes y Martín Ferreyra; INIMEC-CONICET-Universidad Nacional de Córdoba; Friuli 2434 Córdoba 5016 Argentina
- Center for Development and Behavioral Neuroscience; Binghamton University; Binghamton NY
- Facultad de Psicología; Universidad Nacional de Córdoba; Córdoba Argentina
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9
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Nizhnikov ME, Popoola DO, Cameron NM. Transgenerational Transmission of the Effect of Gestational Ethanol Exposure on Ethanol Use-Related Behavior. Alcohol Clin Exp Res 2016; 40:497-506. [PMID: 26876534 DOI: 10.1111/acer.12978] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 12/01/2015] [Indexed: 01/24/2023]
Abstract
BACKGROUND Prenatal alcohol exposure (PAE) enhances the risk for alcoholism by increasing the propensity to consume alcohol and altering neurophysiological response to alcohol challenge. Trans-generationally transmittable genetic alterations have been implicated in these behavioral changes. To date, transgenerational transmission of PAE-induced behavioral responses to alcohol has never been experimentally investigated. Therefore, we explored the transgenerational transmission of PAE-induced behavioral effects across 3 generations. METHODS Pregnant Sprague Dawley dams received 1 g/kg ethanol (EtOH) or water daily on gestational days 17 through 20 via gavage, or remained untreated in their home cages. To produce second filial (F2) or F3 generations, similarly treated adult F1 or F2 offspring were mated and left undisturbed through gestation. On postnatal day (PND) 14, male and female F1, F2, and F3 offspring were tested for consumption of 5% (w/v) EtOH (in water), or water. Using the loss of righting reflex (LORR) paradigm on PND 42, F1 and F2 adolescent male offspring were tested for sensitivity to acute EtOH-induced sedation-hypnosis at 3.5 or 4.5 g/kg dose. F3 male adolescents were similarly tested at 3.5 g/kg dose. Blood EtOH concentration (BEC) was measured at waking. RESULTS EtOH exposure increased EtOH consumption compared to both water and untreated control groups in all generations. EtOH-treated group F1 and F2 adolescents displayed attenuated LORR duration compared to the water group. No attenuated LORR was observed in the F3 generation. BEC at waking corroborated with the significant LORR duration differences while also revealing differences between untreated control and water groups in F1 and F2 generations. CONCLUSIONS Our results provide novel behavioral evidence attesting that late gestational moderate EtOH exposure increases EtOH intake across 3 generations and may alter sensitivity to EtOH-induced sedation-hypnosis across 2 generations.
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Affiliation(s)
| | - Daniel O Popoola
- Center for Development and Behavioral Neuroscience, Binghamton University, Binghamton, New York.,Developmental Exposure Alcohol Research Center, Binghamton University, Binghamton, New York
| | - Nicole M Cameron
- Center for Development and Behavioral Neuroscience, Binghamton University, Binghamton, New York.,Developmental Exposure Alcohol Research Center, Binghamton University, Binghamton, New York
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Ji ML, Wu YH, Qian ZB. Neurotoxicity of prenatal alcohol exposure on medullary pre-Bötzinger complex neurons in neonatal rats. Neural Regen Res 2015; 10:1095-100. [PMID: 26330832 PMCID: PMC4541240 DOI: 10.4103/1673-5374.160101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/07/2015] [Indexed: 01/02/2023] Open
Abstract
Prenatal alcohol exposure disrupts the development of normal fetal respiratory function, but whether it perturbs respiratory rhythmical discharge activity is unclear. Furthermore, it is unknown whether the 5-hydroxytryptamine 2A receptor (5-HT2AR) is involved in the effects of prenatal alcohol exposure. In the present study, pregnant female rats received drinking water containing alcohol at concentrations of 0%, 1%, 2%, 4%, 8% or 10% (v/v) throughout the gestation period. Slices of the medulla from 2-day-old neonatal rats were obtained to record respiratory rhythmical discharge activity. 5-HT2AR protein and mRNA levels in the pre-Bötzinger complex of the respiratory center were measured by western blot analysis and quantitative RT-PCR, respectively. Compared with the 0% alcohol group, respiratory rhythmical discharge activity in medullary slices in the 4%, 8% and 10% alcohol groups was decreased, and the reduction was greatest in the 8% alcohol group. Respiratory rhythmical discharge activity in the 10% alcohol group was irregular. Thus, 8% was the most effective alcohol concentration at attenuating respiratory rhythmical discharge activity. These findings suggest that prenatal alcohol exposure attenuates respiratory rhythmical discharge activity in neonatal rats by downregulating 5-HT2AR protein and mRNA levels.
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Affiliation(s)
- Ming-Li Ji
- Department of Physiology, Xinxiang Medical University, Xinxiang, Henan Province, China
| | - Yun-Hong Wu
- Department of Functional Laboratory, Xinxiang Medical University, Xinxiang, Henan Province, China
| | - Zhi-Bin Qian
- Department of Functional Laboratory, Xinxiang Medical University, Xinxiang, Henan Province, China
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Neonatal sensitization to ethanol-induced breathing disruptions as a function of late prenatal exposure to the drug in the rat: Modulatory effects of ethanol's chemosensory cues. Physiol Behav 2015; 139:412-22. [DOI: 10.1016/j.physbeh.2014.10.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Revised: 10/01/2014] [Accepted: 10/22/2014] [Indexed: 11/24/2022]
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Prenatal ethanol exposure alters met-enkephalin expression in brain regions related with reinforcement: possible mechanism for ethanol consumption in offspring. Behav Brain Res 2014; 274:194-204. [PMID: 25150040 DOI: 10.1016/j.bbr.2014.08.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Revised: 08/07/2014] [Accepted: 08/11/2014] [Indexed: 11/22/2022]
Abstract
The endogenous opioid system is involved in ethanol reinforcement. Ethanol-induced changes in opioidergic transmission have been extensively studied in adult organisms. However, the impact of ethanol exposure at low or moderate doses during early ontogeny has been barely explored. We investigated the effect of prenatal ethanol exposure on alcohol intake and Methionine-enkephalin (Met-enk) content in rat offspring. Met-enk content was assessed in the ventral tegmental area [VTA], nucleus accumbens [NAcc], prefrontal cortex [PFC], substantia nigra [SN], caudate-putamen [CP], amygdala, hypothalamus and hippocampus. Pregnant rats were treated with ethanol (2g/kg) or water during GDs 17-20. At PDs 14 and 15, preweanlings were evaluated in an intake test (5% and 10% ethanol, or water). Met-enk content in brain regions of infants prenatally exposed to ethanol was quantitated by radioimmunoassay. Ethanol consumption was facilitated by prenatal experience with the drug, particularly in females. Met-enk content in mesocorticolimbic regions - PFC and NAcc - was increased as a consequence of prenatal exposure to ethanol. Conversely, Met-enk levels in the VTA were reduced by prenatal ethanol manipulation. Prenatal ethanol also increased peptide levels in the medial-posterior zone of the CP, and strongly augmented Met-enk content in the hippocampus and hypothalamus. These findings show that prenatal ethanol exposure stimulates consumption of the drug in infant rats, and induces selective changes in Met-enk levels in regions of the mesocorticolimbic and nigrostriatal systems, the hypothalamus and hippocampus. Our results support the role of mesocorticolimbic enkephalins in ethanol reinforcement in offspring, as has been reported in adults.
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Nizhnikov ME, Pautassi RM, Carter JM, Landin JD, Varlinskaya EI, Bordner KA, Werner DF, Spear NE. Brief prenatal ethanol exposure alters behavioral sensitivity to the kappa opioid receptor agonist (U62,066E) and antagonist (Nor-BNI) and reduces kappa opioid receptor expression. Alcohol Clin Exp Res 2014; 38:1630-8. [PMID: 24796820 DOI: 10.1111/acer.12416] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Accepted: 03/05/2014] [Indexed: 01/17/2023]
Abstract
BACKGROUND Approximately 10 to 15% of women consume alcohol (ethanol [EtOH]) during pregnancy in the United States. Even low amounts of EtOH consumption during pregnancy can elicit long-term consequences. Prenatal experience with as few as 3 drinks has been associated with increase problem drinking in adulthood. Such effects are corroborated in rodents; however, the underlying neural adaptations contributing to this effect are not clear. In the current set of experiments, we investigated whether changes in EtOH responding following prenatal EtOH exposure involved kappa opioid receptor activation and expression. METHODS Sprague-Dawley rats were prenatally exposed to low levels of alcohol (1.0 g/kg) during late gestation (gestational days 17 to 20 [GD17-20]) via intragastric intubation of pregnant dams. Following birth, EtOH intake, kappa- and mu-opioid-induced place conditioning, and kappa opioid receptor expression in mesolimbic brain regions were assessed in infant rats (postnatal days 14 to 15 [PD14-15]) that were offspring of dams given EtOH, vehicle, or untreated, during pregnancy. RESULTS Animals exposed to prenatal alcohol drank more alcohol later in life and exhibited significant changes in the kappa opioid system. While control subjects found kappa opioid activation aversive, animals exposed to EtOH prenatally exhibited either no aversion or appetitive responding. Further analysis revealed that synaptosomal kappa opioid receptor expression was significantly decreased in brain areas implicated in responding to EtOH. CONCLUSIONS Overall, these data suggest that prenatal EtOH affects kappa opioid function and expression and that these changes may be involved in increased drinking later in life.
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Affiliation(s)
- Michael E Nizhnikov
- Department of Psychology , Center for Development and Behavioral Neuroscience, Binghamton, New York
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March SM, Abate P, Spear NE, Molina JC. The role of acetaldehyde in ethanol reinforcement assessed by Pavlovian conditioning in newborn rats. Psychopharmacology (Berl) 2013. [PMID: 23196716 DOI: 10.1007/s00213-012-2920-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
RATIONALE Animal studies indicate that central acetaldehyde, dependent on catalase metabolism of ethanol (EtOH), modulates ethanol reinforcement. Brain catalase activity and acetaldehyde (ACD) production are significantly higher in rat pups compare d with adults. Interestingly, infant rats show high EtOH affinity for alcohol consumption and are particularly sensitive to the drug's reinforcing effects. OBJECTIVES We tested whether central ACD is necessary and sufficient to induce appetitive conditioning in newborn rats through the artificial nipple technique. METHODS Vehicle, EtOH (100 mg%), and acetaldehyde (0.35 μmol) were administered into the cisterna magna (1 μl). Half of the animals also received a central administration of 75 μg (experiment 1) or 40 μg of D-penicillamine (experiment 2). Afterwards, pups were exposed to an olfactory cue (conditioned stimulus). One hour later, neonates were tested with an artificial nipple in the presence of the conditioned cue. Nipple attachment duration, mean grasp duration, and number of nipple disengagements served as dependent variables. RESULTS Positive responses to the scented nipple occurred in neonates conditioned with EtOH or ACD (experiments 1 and 2). In experiment 1, there were indications that D-penicillamine weakened the reinforcing effects of EtOH and ACD. In experiment 2, D-penicillamine (40 μg) significantly inhibited appetitive conditioned responses dependent upon EtOH or ACD. CONCLUSIONS Appetitive conditioning was observed when employing either central EtOH or ACD as unconditioned stimuli. Central abduction of ACD inhibited conditioned appetitive responsiveness to the surrogate nipple. Central ACD is involved in the determination or modulation of EtOH's motivational properties during early stages in development.
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Affiliation(s)
- Samanta M March
- Instituto de Investigación Médica M. y M. Ferreyra (INIMEC-CONICET), P.O. BOX 389, Friuli 2434, 5016 Córdoba, Argentina.
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Pautassi RM, Camarini R, Quadros IM, Miczek KA, Israel Y. Genetic and environmental influences on ethanol consumption: perspectives from preclinical research. Alcohol Clin Exp Res 2010; 34:976-87. [PMID: 20374217 DOI: 10.1111/j.1530-0277.2010.01172.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
BACKGROUND Alcohol use disorders (abuse and dependence, AUD) are multifactorial phenomena, depending on the interplay of environmental and genetic variables. METHOD This review describes current developments in animal research that may help (a) develop gene therapies for the treatment of alcoholism, (b) understand the permissive role of stress on ethanol intake, and (c) elucidate why exposure to ethanol early in life is associated with a greater risk of AUD. RESULTS The polymorphisms found in liver alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH) affect the elimination of ethanol and the susceptibility to ethanol intake. A highly active ADH protects against alcoholism, an effect related to a presteady state burst in arterial acetaldehyde. Social stressors, such as repeated early maternal separation or social defeat, exert a permissive effect on ethanol intake, perhaps by altering the normal development of the hypothalamic-pituitary-adrenal axis. Ethanol exposure during gestation, infancy, or adolescence increases the likelihood of AUD later in life. Early perception of ethanol's positive and negative (anti-anxiety) reinforcing effects may play a role in this phenomenon. CONCLUSIONS The review underscores the advantages of using preclinical animal models of AUD and highlights points of intersection between the topics to help design a more integrated approach for the study of alcohol-related problems.
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Affiliation(s)
- Ricardo M Pautassi
- Instituto de Investigaciones Médicas M. y M. Ferreyra (INIMEC-CONICET), Argentina.
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March SM, Abate P, Spear NE, Molina JC. Fetal exposure to moderate ethanol doses: heightened operant responsiveness elicited by ethanol-related reinforcers. Alcohol Clin Exp Res 2009; 33:1981-93. [PMID: 19719792 PMCID: PMC3085171 DOI: 10.1111/j.1530-0277.2009.01037.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Prenatal exposure to moderate ethanol doses during late gestation modifies postnatal ethanol palatability and ingestion. The use of Pavlovian associative procedures has indicated that these prenatal experiences broaden the range of ethanol doses capable of supporting appetitive conditioning. Recently, a novel operant technique aimed at analyzing neonatal predisposition to gain access to ethanol has been developed. Experiment 1 tested the operant conditioning technique for developing rats described by Arias and colleagues (2007) and Bordner and colleagues (2008). In Experiment 2, we analyzed changes in the disposition to gain access to ethanol as a result of moderate prenatal exposure to the drug. METHODS In Experiment 1, newborn pups were intraorally cannulated and placed in a supine position that allowed access to a touch-sensitive sensor. Paired pups received an intraoral administration of a given reinforcer (milk or quinine) contingent upon physical contact with the sensor. Yoked controls received similar reinforcers only when Paired pups activated the circuit. In Experiment 2, natural reinforcers (water or milk) as well as ethanol (3% or 6% v/v) or an ethanol-related reinforcer (sucrose compounded with quinine) were tested. In this experiment, pups had been exposed to water or ethanol (1 or 2 g/kg) during gestational days 17 to 20. RESULTS Experiment 1 confirmed previous results showing that 1-day-old pups rapidly learn an operant task to gain access to milk, but not to gain access to a bitter tastant. Experiment 2 showed that water and milk were highly reinforcing across prenatal treatments. Furthermore, general activity during training was not affected by prenatal exposure to ethanol. Most importantly, prenatal ethanol exposure facilitated conditioning when the reinforcer was 3% v/v ethanol or a psychophysical equivalent of ethanol's gustatory properties (sucrose-quinine). CONCLUSIONS The present results suggest that late prenatal experience with ethanol changes the predisposition of the newborn to gain access to ethanol-related stimuli. In conjunction with prior literature, this study emphasizes the fact that intrauterine experience with ethanol not only augments ethanol's palatability and ingestion, but also facilitates the acquisition of response-stimulus associations where the drug acts as an intraoral reinforcer.
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Affiliation(s)
- Samanta M. March
- Instituto de Investigación Médica M. y M. Ferreyra (INIMEC – CONICET), Córdoba, Argentina
- Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Paula Abate
- Instituto de Investigación Médica M. y M. Ferreyra (INIMEC – CONICET), Córdoba, Argentina
- Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Norman E. Spear
- Center for Developmental Psychobiology, Binghamton University, Binghamton, NY, USA
| | - Juan Carlos Molina
- Instituto de Investigación Médica M. y M. Ferreyra (INIMEC – CONICET), Córdoba, Argentina
- Center for Developmental Psychobiology, Binghamton University, Binghamton, NY, USA
- Facultad de Psicología, Universidad Nacional de Córdoba, Córdoba, Argentina
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Chotro MG, Arias C, Spear NE. Binge ethanol exposure in late gestation induces ethanol aversion in the dam but enhances ethanol intake in the offspring and affects their postnatal learning about ethanol. Alcohol 2009; 43:453-63. [PMID: 19801275 DOI: 10.1016/j.alcohol.2009.08.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2008] [Revised: 07/05/2009] [Accepted: 08/06/2009] [Indexed: 11/16/2022]
Abstract
Previous studies show that exposure to 1 or 2g/kg of ethanol during the last days of gestation increases ethanol acceptance in infant rats. We tested whether prenatal exposure to 3g/kg, a relatively high ethanol dose, generates an aversion to ethanol in both the dam and offspring, and whether this prenatal experience affects the expression of learning derived from ethanol exposure postnatally. The answer was uncertain, because postnatal administration of a 3-g/kg ethanol dose induces an aversion to ethanol after postnatal day (PD) 10 but increases ethanol acceptance when administered during the first postnatal week. In the present study, pregnant rats received intragastric administrations of water or ethanol (3g/kg) on gestation days 17-20. On PDs 7-8 or 10-11, the offspring were administered water or ethanol (3g/kg). Intake of ethanol and water, locomotor activity in an open field, and ethanol odor preference were evaluated in the pups, whereas the mothers were evaluated in terms of ethanol intake. Results indicated an aversion to ethanol in dams that had been administered ethanol during gestation, despite a general increase in ethanol intake observed in their pups relative to controls. The prenatal ethanol exposure also potentiated the increase in ethanol intake observed after intoxication on PDs 7-8. Ethanol intoxication on PDs 10-11 reduced ethanol consumption; this ethanol aversion was still evident in infant rats exposed prenatally to ethanol despite their general increase in ethanol intake. No effects of prenatal ethanol exposure were observed in terms of motor activity or odor preference. It is concluded that prenatal exposure to ethanol, even in a dose that induces ethanol aversion in the gestating dam, increases ethanol intake in infant rats and that this experience modulates age-related differences in subsequent postnatal learning about ethanol.
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Affiliation(s)
- M Gabriela Chotro
- Facultad de Psicología, Universidad del País Vasco UPV-EHU, San Sebastián, Spain.
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Abate P, Pueta M, Spear NE, Molina JC. Fetal learning about ethanol and later ethanol responsiveness: evidence against "safe" amounts of prenatal exposure. Exp Biol Med (Maywood) 2008; 233:139-54. [PMID: 18222969 DOI: 10.3181/0703-mr-69] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Near-term fetuses of different mammalian species, including humans, exhibit functional sensory and learning capabilities. The neurobiological literature indicates that the unborn organism processes sensory stimuli present in the amniotic fluid, retains this information for considerable amounts of time, and is also capable of associating such stimuli with biologically relevant events. This research has stimulated studies aimed at the analysis of fetal and neonatal learning about ethanol, a topic that constitutes the core of the present review. Ethanol has characteristic sensory (olfactory, taste, and trigeminal) attributes and can exert pharmacologic reinforcing effects. The studies under examination support the hypothesis that low to moderate levels of maternal ethanol intoxication during late pregnancy set the opportunity for fetal learning about ethanol. These levels of prenatal ethanol exposure do not generate evident morphologic or neurobehavioral alterations in the offspring, but they exert a significant impact upon later ethanol-seeking and intake behaviors. Supported by preclinical and clinical findings, this review contributes to strengthening the case for the ability of prenatal ethanol exposure to have effects on the postnatal organism.
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Affiliation(s)
- Paula Abate
- Instituto de Investigación Médica Mercedes y Martín Ferreyra C.P. 5016, Córdoba, Argentina.
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Molina JC, Spear NE, Spear LP. The International society for developmental psychobiology 39th annual meeting symposium: Alcohol and development: beyond fetal alcohol syndrome. Dev Psychobiol 2007; 49:227-42. [PMID: 17380525 PMCID: PMC1976664 DOI: 10.1002/dev.20224] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
As has been repeatedly demonstrated, alcohol can exert deleterious morphological and physiological effects during early stages in development. The present review examines nonteratological links existing between alcohol and ontogeny. Human and animal studies are taken into consideration for the analysis of fetal, neonatal, infantile, adolescent, and adult responsiveness to the drug. Sensitivity to alcohol's chemosensory and postabsorptive properties, as well as learning and memory processes mediated by such properties, are examined from this developmental perspective. The studies under discussion indicate that, within each stage in development, we can trace alcohol-related experiences capable of determining or modulating alcohol seeking and intake patterns.
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Affiliation(s)
- Juan Carlos Molina
- Department of Psychology, Binghamton University, PO Box 6000, Binghamton, NY 13902-6000, E-mail:
| | - Norman E. Spear
- Department of Psychology, Binghamton University, PO Box 6000, Binghamton, NY 13902-6000, E-mail:
| | - Linda P. Spear
- Department of Psychology, Binghamton University, PO Box 6000, Binghamton, NY 13902-6000, E-mail:
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Nizhnikov ME, Molina JC, Varlinskaya EI, Spear NE. Prenatal ethanol exposure increases ethanol reinforcement in neonatal rats. Alcohol Clin Exp Res 2006; 30:34-45. [PMID: 16433730 DOI: 10.1111/j.1530-0277.2006.00009.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Recent experimental findings indicate that newborn rats are quite susceptible to the reinforcing properties of ethanol (EtOH). The basis seems to be more pharmacological than gustatory, olfactory, or caloric as a single pairing of a surrogate nipple providing water with an intraperitoneal (i.p.) injection of EtOH results in conditioned attachment to an empty surrogate nipple. The present study tested whether prenatal exposure to moderate EtOH during late gestation would alter the neonatal rat's susceptibility to this source of EtOH reinforcement and/or EtOH metabolism. METHODS Pregnant females were given 1 g/kg EtOH or water intragastrically on gestational days (GD) 17 to 20 or were untreated. Rat pups delivered by cesarean section on GD 21 were exposed 3 to 4 hours later to a surrogate nipple providing water, either immediately following or 10 minutes before an i.p. injection of 0.0 (saline), 0.25, 0.5, or 0.75 g/kg EtOH (12.6%, v/v). Ethanol reinforcement was indicated by a significant increase in time attached to an empty surrogate nipple compared with unpaired and saline controls. Testing was conducted 90 minutes after conditioning took place. Blood ethanol levels (BELs) were also taken from subjects injected with identical doses of i.p. EtOH at 5 or 95 minutes after injection. RESULTS Initial response to a surrogate nipple with water did not differ between groups. For neonates prenatally exposed to EtOH, significant reinforcement by all 3 doses of i.p. EtOH (0.25, 0.5, and 0.75) was found, whereas only the dose of 0.5 g/kg EtOH was reinforcing for neonates in the prenatal water condition and only 0.25 g/kg was reinforcing for pups from untreated dams. Blood ethanol levels after conditioning also differed as a function of prenatal treatment. CONCLUSIONS These results suggest that prenatal EtOH exposure increases the range of EtOH doses capable of reinforcing effects. Intubations with water, however, eliminated the reinforcing strength of the lowest dose (0.25 g/kg) and shifted the dose-response curve to the right. This effect may be due to the stress of the intubation procedure. Ethanol metabolism was also affected by prenatal EtOH exposure. Pups derived from EtOH-treated dams had slower elimination of EtOH from the blood than all other groups at both the 0.5 and 0.75 g/kg i.p. doses.
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Affiliation(s)
- Michael E Nizhnikov
- Department of Psychology, Center for Developmental Psychobiology, Binghamton University, Binghamton, NY 13902-6000, USA
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