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Ferroni NM, Berardino BG, Belluscio LM, Fernández MS, Fesser EA, Sonzogni SV, Cánepa ET. Perinatal protein malnutrition induces the emergence of enduring effects and age-related impairment behaviors, increasing the death risk in a mouse model. Nutr Neurosci 2020; 25:976-989. [PMID: 33034271 DOI: 10.1080/1028415x.2020.1829343] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
BACKGROUND Early-life adversity impacts on the offspring's brain development and is associated with a higher risk of developing age-associated diseases. In particular, perinatal protein malnutrition appears to be one of the most critical nutritional deficiencies affecting the individual's health and survival, but little is known about its effects on the persistence of behavioral alterations throughout life. Thus, the aim of the present study was to investigate how perinatal protein malnutrition impacts on age-related changes in the neuromuscular, cognitive and behavioral functions throughout life in a mouse model. METHODS One group of CF-1 dams received a normal-protein diet (NP: 20% casein) during gestation and lactation, whereas another group received a low-protein diet (LP: 10% casein). The offspring of both groups were analyzed by means of several behavioral tests at four different ages (young: 6-10 weeks old, mature: 22-26 weeks old, middle age: 39-43 weeks old, and old: 55-59 weeks old). RESULTS Regarding neuromuscular functions, LP mice showed an early deterioration in muscular strength and a reduction in the body weight throughout life. Regarding behavior, while NP mice showed an age-related reduction of exploratory behavior, LP mice showed a constantly low level of this behavior, as well as high anxiety-like behavior, which remained at high levels throughout life. Regarding cognitive functions, LP mice showed deteriorated working memory at middle age. Finally, LP mice died 3.4 times earlier than NP mice. Analysis of the sex-related vulnerability showed that females and males were equally affected by perinatal protein malnutrition throughout life. CONCLUSION Our results demonstrate that perinatal protein malnutrition induces enduring and age-related impairment behaviors, which culminate in higher death risk, affecting males and females equally.
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Affiliation(s)
- Nadina M Ferroni
- Laboratorio de Neuroepigenética, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina
| | - Bruno G Berardino
- Laboratorio de Neuroepigenética, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina
| | - Laura M Belluscio
- Laboratorio de Neuroepigenética, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina
| | - María S Fernández
- Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), UBA-CONICET, Ciudad de Buenos Aires, Argentina
| | - Estefanía A Fesser
- Laboratorio de Neuroepigenética, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina
| | - Silvina V Sonzogni
- Laboratorio de Neuroepigenética, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina
| | - Eduardo T Cánepa
- Laboratorio de Neuroepigenética, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina
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Berardino BG, Ballarini F, Chertoff M, Igaz LM, Cánepa ET. Nutritional stress timing differentially programs cognitive abilities in young adult male mice. Nutr Neurosci 2020; 25:286-298. [PMID: 32308155 DOI: 10.1080/1028415x.2020.1751507] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Objectives: The impact of chronic exposure to environmental adversities on brain regions involved in cognition and mental health depends on whether it occurs during the perinatal period, childhood, adolescence or adulthood. The effects of these adversities on the brain and behavior arise as a function of the timing of the exposure and their co-occurrence with the development of specific regions. Here we aimed to explore the behavioral phenotypes derived from two nutritional stress paradigms which differed in the timing of exposure: a low-protein perinatal diet during gestation and lactation and a low-protein diet during adolescence.Methods: Locomotor and exploratory activity, recognition memory and aversive memory were measured in CF-1 8-week-old male mice subjected to perinatal malnutrition (LP-P) or adolescent malnutrition (LP-A), and their respective controls with normal protein diet (NP-P and NP-A).Results: By using the open field test, we found that LP-P and LP-A mice showed reduced exploratory activity compared to controls, but no alterations in their locomotor activity. Recognition memory was impaired only in LP-P mice. Interestingly, aversive memory was not altered in LP-P mice but was enhanced in LP-A mice. Considering the stress-inoculation theory, we hypothesized that protein malnutrition during adolescence represents a challenging but still moderate stressful environment, which promotes active coping in face of later adversity.Conclusion: Our results indicate that while perinatal malnutrition impairs recognition memory, adolescent malnutrition enhances aversive memory, showing dissimilar adaptive responses.
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Affiliation(s)
- Bruno G Berardino
- Laboratorio de Neuroepigenética, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and Instituto de Química Biológica de Ciencias Exactas y Naturales, CONICET, Ciudad de Buenos Aires, Argentina
| | - Fabricio Ballarini
- Facultad de Medicina, Universidad de Buenos Aires - IBCN "Eduardo De Robertis" (CONICET), Ciudad de Buenos Aires, Argentina
| | - Mariela Chertoff
- Laboratorio de Neuroepigenética, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and Instituto de Química Biológica de Ciencias Exactas y Naturales, CONICET, Ciudad de Buenos Aires, Argentina
| | - Lionel M Igaz
- IFIBIO Bernardo Houssay, Grupo de Neurociencia de Sistemas, Facultad de Medicina, Universidad de Buenos Aires - CONICET, Buenos Aires, Argentina
| | - Eduardo T Cánepa
- Laboratorio de Neuroepigenética, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and Instituto de Química Biológica de Ciencias Exactas y Naturales, CONICET, Ciudad de Buenos Aires, Argentina
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Soares RO, Horiquini-Barbosa E, Almeida SS, Lachat JJ. Environmental enrichment protects spatial learning and hippocampal neurons from the long-lasting effects of protein malnutrition early in life. Behav Brain Res 2017; 335:55-62. [DOI: 10.1016/j.bbr.2017.08.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 07/25/2017] [Accepted: 08/05/2017] [Indexed: 01/17/2023]
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Pini RTB, Ferreira do Vales LDM, Braga Costa TM, Almeida SS. Effects of cafeteria diet and high fat diet intake on anxiety, learning and memory in adult male rats. Nutr Neurosci 2016; 20:396-408. [DOI: 10.1080/1028415x.2016.1149294] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Renata Tavares Beschizza Pini
- Laboratory of Nutrition and behavior, FFLCLRP, University of São Paulo, Avenida dos Bandeirantes, 3900, Ribeirão Preto, SP 14040-901, Brazil
| | | | - Telma Maria Braga Costa
- Nutrition Course, UNAERP, University of Ribeirão Preto, Avenida Costabile Romano, 2201, Ribeirão Preto, SP 14096-900, Brazil
| | - Sebastião Sousa Almeida
- Laboratory of Nutrition and behavior, FFLCLRP, University of São Paulo, Avenida dos Bandeirantes, 3900, Ribeirão Preto, SP 14040-901, Brazil
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Venkareddy LK, Muralidhara. Potential of casein as a nutrient intervention to alleviate lead (Pb) acetate-mediated oxidative stress and neurotoxicity: First evidence in Drosophila melanogaster. Neurotoxicology 2015; 48:142-51. [DOI: 10.1016/j.neuro.2015.03.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 02/27/2015] [Accepted: 03/06/2015] [Indexed: 12/25/2022]
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Maldonado-Cedillo BG, Díaz-Ruiz A, Montes S, Galván-Arzate S, Ríos C, Beltrán-Campos V, Alcaraz-Zubeldia M, Díaz-Cintra S. Prenatal malnutrition and lead intake produce increased brain lipid peroxidation levels in newborn rats. Nutr Neurosci 2015; 19:301-9. [DOI: 10.1179/1476830515y.0000000003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Affiliation(s)
- Brenda Gabriela Maldonado-Cedillo
- Departamento de Neurofisiología del Desarrollo y Neurofisiología, Instituto de Neurobiología Campus UNAM-Juriquilla, Santiago de Querétaro, Querétaro, México
| | - Araceli Díaz-Ruiz
- Departamento de Neuroquímica, Instituto Nacional de Neurología y Neurocirugía, Ciudad de México, DF, México
| | - Sergio Montes
- Departamento de Neuroquímica, Instituto Nacional de Neurología y Neurocirugía, Ciudad de México, DF, México
| | - Sonia Galván-Arzate
- Departamento de Neuroquímica, Instituto Nacional de Neurología y Neurocirugía, Ciudad de México, DF, México
| | - Camilo Ríos
- Departamento de Neuroquímica, Instituto Nacional de Neurología y Neurocirugía, Ciudad de México, DF, México
- Departamento de Sistemas Biológicos de la Universidad Autónoma Metropolitana, Unidad Xochimilco México, Delegación Coyoacán, DF, México
| | - Vicente Beltrán-Campos
- División de Ciencias de las Salud e Ingenierías, Universidad de Guanajuato, Campus Celaya-Salvatierra, Celaya, Guanajuato, México
| | - Mireya Alcaraz-Zubeldia
- Departamento de Neuroquímica, Instituto Nacional de Neurología y Neurocirugía, Ciudad de México, DF, México
| | - Sofia Díaz-Cintra
- Departamento de Neurofisiología del Desarrollo y Neurofisiología, Instituto de Neurobiología Campus UNAM-Juriquilla, Santiago de Querétaro, Querétaro, México
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Françolin-Silva AL, Brandão ML, Almeida SS. Early postnatal protein malnutrition causes resistance to the anxiolytic effects of diazepam as assessed by the fear-potentiated startle test. Nutr Neurosci 2013; 10:23-9. [PMID: 17539480 DOI: 10.1080/10284150601168346] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Given that protein malnutrition induces structural, neurochemical and functional changes in the CNS, the present study aimed to investigate the effects of different early periods of protein malnutrition on the behavior and reactivity to diazepam (DZ) in a model of anxiety: the fear-potentiated startle (FPS). Male Wistar rats (n = 110) from well-nourished (16 %-protein) or malnourished (6%-protein) litters were distributed in five different groups: W (well-nourished), M7 (malnourished for 7-days, since day 0), M14 (14-days), M21 (21-days) and M28 (28-days). The results obtained in FPS revealed that malnourished-animals acquired the startle response, irrespective of the time they were exposed to the diet. Besides, DZ reduced the startle amplitude in the noise-alone and light-noise trials. The data concerning the total freezing time showed that the expression of this response was affected by malnutrition and varied in accordance with the findings of previous studies in which malnutrition procedures was imposed for long periods (more than 50 days). Therefore, we suggest that early protein malnutrition: (a) did not produce deficits in the associative learning process of these animals in the FPS, and (b) decreased freezing time in the FPS and produce hyporeactivity to the effects of DZ in rats malnourished for 21 days or more, indicating alterations in the GABAergic neurotransmitter system.
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Affiliation(s)
- A L Françolin-Silva
- Laboratory of Nutrition and Behavior, Department of Psychology, FFCLRP, University of São Paulo, Avenida dos Bandeirantes, 3900, 14040-901 Ribeirão Preto SP, Brazil
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Hoddinott J, Alderman H, Behrman JR, Haddad L, Horton S. The economic rationale for investing in stunting reduction. MATERNAL & CHILD NUTRITION 2013; 9 Suppl 2:69-82. [PMID: 24074319 PMCID: PMC6860695 DOI: 10.1111/mcn.12080] [Citation(s) in RCA: 187] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
This paper outlines the economic rationale for investments that reduce stunting. We present a framework that illustrates the functional consequences of stunting in the 1000 days after conception throughout the life cycle: from childhood through to old age. We summarize the key empirical literature around each of the links in the life cycle, highlighting gaps in knowledge where they exist. We construct credible estimates of benefit-cost ratios for a plausible set of nutritional interventions to reduce stunting. There are considerable challenges in doing so that we document. We assume an uplift in income of 11% due to the prevention of one fifth of stunting and a 5% discount rate of future benefit streams. Our estimates of the country-specific benefit-cost ratios for investments that reduce stunting in 17 high-burden countries range from 3.6 (DRC) to 48 (Indonesia) with a median value of 18 (Bangladesh). Mindful that these results hinge on a number of assumptions, they compare favourably with other investments for which public funds compete.
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Affiliation(s)
- John Hoddinott
- PovertyHealth and Nutrition DivisionInternational Food Policy Research InstituteWashingtonDCUSA
| | - Harold Alderman
- PovertyHealth and Nutrition DivisionInternational Food Policy Research InstituteWashingtonDCUSA
| | - Jere R. Behrman
- Departments of Economics and Sociology and Population Studies CenterUniversity of PennsylvaniaPhiladelphiaPennsylvaniaUSA
| | | | - Susan Horton
- Balsillie School of International AffairsUniversity of WaterlooOntarioCanada
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Huber RC, Kolb AF, Lillico S, Carlisle A, Sandøe P, Sørensen DB, Remuge L, Whitelaw BCA, Olsson AIS. Behaviour of postnatally growth-impaired mice during malnutrition and after partial weight recovery. Nutr Neurosci 2013; 16:125-34. [DOI: 10.1179/1476830512y.0000000038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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11
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Valadares C, Fukuda M, Françolin-Silva A, Hernandes A, Almeida S. Effects of postnatal protein malnutrition on learning and memory procedures. Nutr Neurosci 2013; 13:274-82. [DOI: 10.1179/147683010x12611460764769] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Plaçais PY, Preat T. To favor survival under food shortage, the brain disables costly memory. Science 2013; 339:440-2. [PMID: 23349289 DOI: 10.1126/science.1226018] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The brain regulates energy homeostasis in the organism. Under resource shortage, the brain takes priority over peripheral organs for energy supply. But can the brain also down-regulate its own consumption to favor survival? We show that the brain of Drosophila specifically disables the costly formation of aversive long-term memory (LTM) upon starvation, a physiological state required for appetitive LTM formation. At the neural circuit level, the slow oscillations normally triggered in two pairs of dopaminergic neurons to enable aversive LTM formation were abolished in starved flies. Transient artificial activation of these neurons during training restored LTM formation in starved flies but at the price of a reduced survival. LTM formation is thus subject to adaptive plasticity that helps survival under food shortage.
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Affiliation(s)
- Pierre-Yves Plaçais
- Genes and Dynamics of Memory Systems, Neurobiology Unit, UMR 7637 École Supérieure de Physique et de Chimie Industrielles/CNRS, 10 rue Vauquelin, 75005 Paris, France
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Konycheva G, Dziadek MA, Ferguson LR, Krägeloh CU, Coolen MW, Davison M, Breier BH. Dietary methyl donor deficiency during pregnancy in rats shapes learning and anxiety in offspring. Nutr Res 2011; 31:790-804. [DOI: 10.1016/j.nutres.2011.09.015] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 09/20/2011] [Accepted: 09/22/2011] [Indexed: 01/22/2023]
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Laus MF, Vales LDMF, Costa TMB, Almeida SS. Early postnatal protein-calorie malnutrition and cognition: a review of human and animal studies. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2011; 8:590-612. [PMID: 21556206 PMCID: PMC3084481 DOI: 10.3390/ijerph8020590] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/01/2011] [Revised: 01/26/2011] [Accepted: 02/10/2011] [Indexed: 11/17/2022]
Abstract
Malnutrition continues to be recognized as the most common and serious form of children's dietary disease in the developing countries and is one of the principal factors affecting brain development. The purpose of this paper is to review human and animal studies relating malnutrition to cognitive development, focusing in correlational and interventional data, and to provide a discussion of possible mechanisms by which malnutrition affects cognition.
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Affiliation(s)
- Maria Fernanda Laus
- Laboratory of Nutrition and Behavior, Department of Psychology and Education, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14040-901, Ribeirão Preto, SP, Brazil; E-Mails: (M.F.L.); (L.D.M.F.V.)
| | - Lucas Duarte Manhas Ferreira Vales
- Laboratory of Nutrition and Behavior, Department of Psychology and Education, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14040-901, Ribeirão Preto, SP, Brazil; E-Mails: (M.F.L.); (L.D.M.F.V.)
| | - Telma Maria Braga Costa
- Nutrition Course, University of Ribeirão Preto, Av. Costábile Romano, 2.201, Bloco U, 14096-900, Ribeirão Preto, SP, Brazil; E-Mail:
| | - Sebastião Sousa Almeida
- Laboratory of Nutrition and Behavior, Department of Psychology and Education, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14040-901, Ribeirão Preto, SP, Brazil; E-Mails: (M.F.L.); (L.D.M.F.V.)
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Fukuda MTH, Françolin-Silva AL, Hernandes AS, Valadares CT, Almeida SS. Effects of early protein malnutrition and scopolamine on learning and memory in the Morris water maze. Nutr Neurosci 2008; 10:251-9. [PMID: 18284033 DOI: 10.1080/10284150701723818] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The present study investigated the effects of early protein malnutrition on the spatial learning and memory processes. The consequences of malnutrition for the cholinergic system were evaluated by comparing the performance of malnourished and control animals in the Morris water maze after treatment with scopolamine. The learning test consisted of placing the animal in the maze to escape to a submerged platform with 12 trials per day for two consecutive days. After 24 trials, the platform was removed, the rats were placed in the maze and the time spent by them in each quadrant was recorded. After 28 days the animals were tested in a single trial to verify the retention of the spatial information. In the first Experiment, scopolamine (0.0, 0.2, 0.4 and 0.6 mg/kg per ml. i.p.) was administered 20 min before the experimental sessions. In the second experiment, a dose of 0.6 mg/kg was administered after the sessions, during the period in which learning consolidation occurs. In the first experiment, there was a significant effect of the drug, with scopolamine impairing, learning in both nutritional conditions. In the saline condition, control animals presented a better performance when compared with malnourished animals. However, 28 days later, both groups increased their latencies. With 0.2 and 0.4 mg/kg of scopolamine, the performance of both nutritional groups was similar and with 0.6 mg/kg malnourished animals performed better than controls. In the second experiment, malnourished animals were also less reactive to the effects of scopolamine, resulting in lower impairments as compared to control animals. These data suggest long-term changes in learning and memory as the result of changes produced by protein malnutrition in the cholinergic neurotransmitter system.
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Affiliation(s)
- M T H Fukuda
- Laboratory of Nutrition and Behavior, FFCLRP, University of São Paulo, Avenida dos Bandeirantes, 3900, Ribeirão Preto, SP 14040-901, Brazil
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Decreased memory for novel object recognition in chronically food-restricted mice is reversed by acute ghrelin administration. Neuroscience 2008; 153:929-34. [PMID: 18434026 DOI: 10.1016/j.neuroscience.2008.03.015] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2007] [Revised: 02/12/2008] [Accepted: 03/08/2008] [Indexed: 11/23/2022]
Abstract
It has been demonstrated, in normal and aged rats and mice, that acute i.c.v. ghrelin (Ghr) administration increases memory retention. In order to evaluate if this treatment, restores memory retention in animals exhibiting impaired memory, in the present work we selected a chronic food restriction mouse model (since undernutrition prejudices higher nervous functions). We employed adult female mice with 28 days of 50% food restriction and evaluated: a) behavioral performance using novel object recognition test for memory, and plus maze for anxiety-like behavior, b) some morphometric parameters as body and hepatic weights and c) plasma Ghr levels. The animals with 50% food restriction showed an increase in plasma Ghr levels and a decrease in morphometric parameters and in the percentage of novel object recognition time. When the peptide was i.c.v. injected in food-restricted animals (0.03, 0.3 or 3.0 nmol/microl), memory increases in relation to food-restricted mice injected with vehicle, reaching a performance similar to controls.
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Díaz-Cintra S, González-Maciel A, Morales MA, Aguilar A, Cintra L, Prado-Alcalá RA. Protein malnutrition differentially alters the number of glutamic acid decarboxylase-67 interneurons in dentate gyrus and CA1–3 subfields of the dorsal hippocampus. Exp Neurol 2007; 208:47-53. [PMID: 17706195 DOI: 10.1016/j.expneurol.2007.07.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2007] [Revised: 06/28/2007] [Accepted: 07/04/2007] [Indexed: 10/23/2022]
Abstract
In 30- and 90-day-old rats, using immunohistochemistry for glutamic acid decarboxylase 67 (GAD-67), we have tested whether malnutrition during different periods of hippocampal development produces deleterious effects on the population of GABA neurons in the dentate gyrus (DG) and cornu Ammonis (CA1-3) of the dorsal hippocampus. Animals were under one of four nutritional conditions: well-nourished controls (Con), prenatal protein malnourished (PreM), postnatal protein malnourished (PostM), and chronic protein malnourished (ChroM). We found that the number of GAD-67-positive (GAD-67+) interneurons was higher in the DG than in the CA1-3 areas of both Con and malnourished groups. Regarding the DG, the number of GAD-67+ interneurons was increased in PreM and PostM and decreased in ChroM at 30 days. At 90 days of age the number of GAD-67+ interneurons was increased in PostM and ChroM and remained unchanged in PreM. With respect to CA1-3, the number of labeled interneurons was decreased in PostM and ChroM at 30 days of age, but no change was found in PreM. At 90 days no changes in the number of these interneurons were found in any of the groups. These observations suggest that 1) the cell death program starting point is delayed in DG GAD-67+ interneurons, and 2) protein malnutrition differentially affects GAD-67+ interneuron development throughout the dorsal hippocampus. Thus, these changes in the number of GAD-67+ interneurons may partly explain the alterations in modulation of dentate granule cell excitability, as well as in the emotional, motivational, and memory disturbances commonly observed in malnourished rats.
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Affiliation(s)
- Sofía Díaz-Cintra
- Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro, Qro., 76230, Mexico
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Alfaro-Rodríguez A, González-Piña R, González-Maciel A, Arch-Tirado E. Serotonin and 5-hydroxy-indole-acetic acid contents in dorsal raphe and suprachiasmatic nuclei in normal, malnourished and rehabilitated rats under 24 h of sleep deprivation. Brain Res 2006; 1110:95-101. [PMID: 16876773 DOI: 10.1016/j.brainres.2006.06.069] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2005] [Revised: 06/16/2006] [Accepted: 06/19/2006] [Indexed: 11/17/2022]
Abstract
It has been discussed that serotonin (5-HT) could be involved in the effects of sleep deprivation (SD) and/or malnutrition (M) on the sleep-wake cycle. The aim of this work was to study the effects of the M, SD and its interaction on 5-HT and 5-hydroxy-indole-acetic acid (5-HIAA) contents in the dorsal raphe (DR) and the suprachiasmatic nuclei (SCN), two sleep-wake cycle regulators. Forty-eight puppets rats were obtained from mothers fed with low or normal casein diet. They were allocated in 3 groups (n=16 each): prenatal/postnatal casein malnutrition (6/6%), prenatal casein malnutrition/nutritional casein rehabilitation (6/25%) and prenatal/postnatal casein well-nourished state (25/25%). When rats were 60 days old, 24 animals were exposed to sleep deprivation by means of forced locomotion during 24 h. The remaining 24 were kept under normal conditions of sleep-wake cycle. Then, all animals were sacrificed by decapitation. DR and SCN were dissected and processed to determine the 5-HT and 5-HIAA contents by means of HPLC. It was observed that 6/6% rats showed a 5-HT increase (DR p<0.011; SCN p<0.019) as well as in SD (DR p<0.0008; SCN p<0.0009) with respect to 25/25% rats. No differences were found in 6/25% rats. Therefore, 5-HIAA decreased significantly in both nuclei in all the groups, notably in M+SD animals (DR p<0.001; SCN p<0.001). We conclude that the sleep-wake cycle disruptions produced by chronic M and SD are mediated in part by a synergistic effect on 5-HT in the DR-SCN pathway, perhaps due to a delay in the development of such brain structures.
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Affiliation(s)
- A Alfaro-Rodríguez
- Laboratorio de Neuroquímica, Instituto Nacional de Rehabilitación, SSA, México.
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