1
|
Sykes DJ, Solanki S, Chukkapalli S, Williams K, Newman EA, Resnicow K, Shah YM. Structural enrichment attenuates colitis-associated colon cancer. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.02.13.580099. [PMID: 38405737 PMCID: PMC10888747 DOI: 10.1101/2024.02.13.580099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/27/2024]
Abstract
Colorectal cancer (CRC) is a major public health concern and disproportionately impacts racial/ethnic minority populations in the US. Animal models are helpful in examining human health disparities because many stress-induced human health conditions can be recapitulated using mouse models. Azoxymethane (AOM)/ dextran sodium sulfate (DSS) treatment can be used to model colitis-associated cancers. While colitis-associated cancers account for only 2% of colon cancers, the AOM/DSS model is useful for examining links between inflammation, immunity, and colon cancer. Mice were housed in enriched and impoverished environments for 1-month prior to behavioral testing. Following behavioral testing the mice were subjected to the AOM/DSS model. While our analysis revealed no significant behavioral variances between the impoverished and enriched housing conditions, we found significant effects in tumorigenesis. Enriched mice had fewer tumors and smaller tumor volumes compared to impoverished mice. African Americans are at higher risk for early onset colorectal cancers in part due to social economic status. Furthermore, housing conditions and environment may reflect social economic status. Research aimed at understanding links between social economic status and colorectal cancer progression is important for eliminating disparities in health outcomes.
Collapse
|
2
|
Mansk LMZ, Jaimes LF, Dias TL, Pereira GS. Social recognition memory differences between mouse strains: On the effects of social isolation, adult neurogenesis, and environmental enrichment. Brain Res 2023; 1819:148535. [PMID: 37595660 DOI: 10.1016/j.brainres.2023.148535] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 07/25/2023] [Accepted: 08/14/2023] [Indexed: 08/20/2023]
Abstract
Remembering conspecifics is paramount for the establishment and maintenance of groups. Here we asked whether the variability in social behavior caused by different breeding strategies affects social recognition memory (SRM). We tested the hypothesis that the inbred Swiss and the outbred C57BL/6 mice behave differently on SRM. Social memory in C57BL/6 mice endured at least 14 days, while in Swiss mice lasted 24 h but not ten days. We showed previously that an enriched environment enhanced the persistence of SRM in Swiss mice. Here we reproduced this result and added that it also increases the survival of adult-born neurons in the hippocampus. Next, we tested whether prolonged SRM observed in C57BL/6 mice could be changed by diminishing the trial duration or using an interference stimulus after learning. Neither short acquisition time nor interference during consolidation affected it. However, social isolation impaired SRM in C57BL/6 mice, similar to what was previously observed in Swiss mice. Our results demonstrate that SRM expression can vary according to the mouse strain, which shows the importance of considering this variable when choosing the most suitable model to answer specific questions about this memory system. We also demonstrate the suitability of both C57BL/6 and Swiss strains for exploring the impact of environmental conditions and adult neurogenesis on social memory.
Collapse
Affiliation(s)
- Lara M Z Mansk
- Núcleo de Neurociências, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Laura F Jaimes
- Núcleo de Neurociências, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Thomaz L Dias
- Núcleo de Neurociências, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil; Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, Brazil
| | - Grace S Pereira
- Núcleo de Neurociências, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
| |
Collapse
|
3
|
García-Gómez L, Castillo-Fernández I, Perez-Villalba A. In the pursuit of new social neurons. Neurogenesis and social behavior in mice: A systematic review. Front Cell Dev Biol 2022; 10:1011657. [PMID: 36407114 PMCID: PMC9672322 DOI: 10.3389/fcell.2022.1011657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 10/17/2022] [Indexed: 11/06/2022] Open
Abstract
Social behaviors have become more relevant to our understanding of the human nervous system because relationships with our peers may require and modulate adult neurogenesis. Here, we review the pieces of evidence we have to date for the divergence of social behaviors in mice by modulation of adult neurogenesis or if social behaviors and the social environment can drive a change in neurogenic processes. Social recognition and memory are deeply affected by antimitotic drugs and irradiation, while NSC transgenic mice may run with lower levels of social discrimination. Interestingly, social living conditions can create a big impact on neurogenesis. Social isolation and social defeat reduce the number of new neurons, while social dominance and enrichment of the social environment increase their number. These new “social neurons” trigger functional modifications with amazing transgenerational effects. All of these suggest that we are facing two bidirectional intertwined variables, and the great challenge now is to understand the cellular and genetic mechanisms that allow this relationship to be used therapeutically.
Collapse
|
4
|
Mieske P, Hobbiesiefken U, Fischer-Tenhagen C, Heinl C, Hohlbaum K, Kahnau P, Meier J, Wilzopolski J, Butzke D, Rudeck J, Lewejohann L, Diederich K. Bored at home?—A systematic review on the effect of environmental enrichment on the welfare of laboratory rats and mice. Front Vet Sci 2022; 9:899219. [PMID: 36061113 PMCID: PMC9435384 DOI: 10.3389/fvets.2022.899219] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 07/19/2022] [Indexed: 11/13/2022] Open
Abstract
Boredom is an emotional state that occurs when an individual has nothing to do, is not interested in the surrounding, and feels dreary and in a monotony. While this condition is usually defined for humans, it may very well describe the lives of many laboratory animals housed in small, barren cages. To make the cages less monotonous, environmental enrichment is often proposed. Although housing in a stimulating environment is still used predominantly as a luxury good and for treatment in preclinical research, enrichment is increasingly recognized to improve animal welfare. To gain insight into how stimulating environments influence the welfare of laboratory rodents, we conducted a systematic review of studies that analyzed the effect of enriched environment on behavioral parameters of animal well–being. Remarkably, a considerable number of these parameters can be associated with symptoms of boredom. Our findings show that a stimulating living environment is essential for the development of natural behavior and animal welfare of laboratory rats and mice alike, regardless of age and sex. Conversely, confinement and under-stimulation has potentially detrimental effects on the mental and physical health of laboratory rodents. We show that boredom in experimental animals is measurable and does not have to be accepted as inevitable.
Collapse
Affiliation(s)
- Paul Mieske
- German Center for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Ute Hobbiesiefken
- German Center for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Carola Fischer-Tenhagen
- German Center for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Céline Heinl
- German Center for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Katharina Hohlbaum
- German Center for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Pia Kahnau
- German Center for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Jennifer Meier
- German Center for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Jenny Wilzopolski
- German Center for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Daniel Butzke
- German Center for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Juliane Rudeck
- German Center for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Lars Lewejohann
- German Center for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment (BfR), Berlin, Germany
- Institute of Animal Welfare, Animal Behavior and Laboratory Animal Science, Freie Universität Berlin, Berlin, Germany
| | - Kai Diederich
- German Center for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment (BfR), Berlin, Germany
- *Correspondence: Kai Diederich
| |
Collapse
|
5
|
Keloglan Musuroglu S, Ozturk DM, Sahin L, Cevik OS, Cevik K. Environmental enrichment as a strategy: Attenuates the anxiety and memory impairment in social isolation stress. Int J Dev Neurosci 2022; 82:499-512. [PMID: 35724417 DOI: 10.1002/jdn.10205] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 05/12/2022] [Accepted: 06/07/2022] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND Social isolation (SI) early in life produces behavioral and cognitive abnormalities. On the contrary, environmental enrichment (EE) offers beneficial effects on brain plasticity and development. This study was designed to examine how EE affects memory functions, anxiety level, and the expression levels of memory/anxiety-related genes such as NR2A, NR2B, BDNF, and cFos in the hippocampus of socially isolated rats. MATERIALS AND METHODS Wistar albino male rats (n = 40) were separated into the five groups: Standard cage (SC), SI, EE, SI + SC, and SI + EE group. For each group, eight rats were housed, either grouped or isolated, in a standard or 3-week EE, respectively. Morris water maze test (MWMT) was used for measuring the learning and memory function. Elevated plus maze (EPM) and open field (OF) were used for the evaluation of anxiety behavior. Blood corticosterone level was evaluated by the ELISA method. The expression levels of genes were measured by the RT-PCR method. RESULTS Results showed that EE increased memory performance in the SI group (p < 0.05). SI caused anxiety while EE improved anxiety behavior (p < 0.05). There was no significant difference between the groups in the OF test. Corticosterone levels did not change between groups. BDNF expression level was downregulated in EE and SI + SC compared with the SC group (respectively; p = 0.012; p = 0.011). NR2A, NR2B, and cFos expression levels did not change between groups significantly. CONCLUSIONS SI impaired memory performance while EE has beneficial effects on memory in socially isolated rats. EE alone was insufficient to cause alterations in the memory performance. The therapeutic effects of EE became strengthened while applied together with stress protocol. Together with improving the effectiveness of memory function, EE has the potential to decrease anxiety behavior. EE seemed to be the reason for decreasing in BDNF.
Collapse
Affiliation(s)
| | - Duygu Murat Ozturk
- Midwifery Department, Faculty of Health Sciences, Amasya University, Amasya, Turkey
| | - Leyla Sahin
- Physiology Department, Faculty of Medicine, Mersin University, Mersin, Turkey
| | - Ozge Selin Cevik
- Physiology Department, Faculty of Medicine, Mersin University, Mersin, Turkey
| | - Kenan Cevik
- Health Sciences Institute, Faculty of Medicine, Mersin University, Mersin, Turkey
| |
Collapse
|
6
|
Ma YK, Zeng PY, Chu YH, Lee CL, Cheng CC, Chen CH, Su YS, Lin KT, Kuo TH. Lack of social touch alters anxiety-like and social behaviors in male mice. Stress 2022; 25:134-144. [PMID: 35254226 DOI: 10.1080/10253890.2022.2047174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
The importance of social interactions has been reported in a variety of animal species. In human and rodent models, social isolation is known to alter social behaviors and change anxiety or depression levels. During the coronavirus pandemic, although people could communicate with each other through other sensory cues, social touch was mostly prohibited under different levels of physical distancing policies. These social restrictions inspired us to explore the necessity of physical contact, which has rarely been investigated in previous studies on mouse social interactions. We first conducted a long-term observation to show that pair-housed mice in a standard laboratory cage spent nearly half the day in direct physical contact with each other. Furthermore, we designed a split-housing condition to demonstrate that even with free access to visual, auditory, and olfactory social signals, the lack of social touch significantly increased anxiety-like behaviors and changed social behaviors. There were correspondingly higher levels of the pro-inflammatory cytokine interleukin-6 in the hippocampus in mice with no access to physical contact. Our study demonstrated the necessity of social touch for the maintenance of mental health in mice and could have important implications for human social interactions.
Collapse
Affiliation(s)
- Yu-Kai Ma
- Department of Life Science, National Tsing Hua University, Hsinchu, Republic of China
| | - Pei-Yun Zeng
- Department of Medical Science, National Tsing Hua University, Hsinchu, Republic of China
| | - Yu-Hsin Chu
- Department of Life Science, National Tsing Hua University, Hsinchu, Republic of China
| | - Chih-Lin Lee
- Institute of Systems Neuroscience, National Tsing Hua University, Hsinchu, Republic of China
| | - Ching-Chuan Cheng
- Department of Life Science, National Tsing Hua University, Hsinchu, Republic of China
| | - Chen-Hung Chen
- Institute of Systems Neuroscience, National Tsing Hua University, Hsinchu, Republic of China
| | - Yu-Shan Su
- Institute of Systems Neuroscience, National Tsing Hua University, Hsinchu, Republic of China
| | - Kai-Ti Lin
- Department of Medical Science, National Tsing Hua University, Hsinchu, Republic of China
- Institute of Biotechnology, National Tsing Hua University, Hsinchu, Republic of China
| | - Tsung-Han Kuo
- Department of Life Science, National Tsing Hua University, Hsinchu, Republic of China
- Institute of Systems Neuroscience, National Tsing Hua University, Hsinchu, Republic of China
- Brain Research Center, National Tsing Hua University, Hsinchu, Republic of China
| |
Collapse
|
7
|
Funabashi D, Wakiyama Y, Muto N, Kita I, Nishijima T. Social isolation is a direct determinant of decreased home-cage activity in mice: A within-subjects study using a body-implantable actimeter. Exp Physiol 2021; 107:133-146. [PMID: 34921441 DOI: 10.1113/ep090132] [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] [Received: 10/14/2021] [Accepted: 12/13/2021] [Indexed: 11/08/2022]
Abstract
NEW FINDINGS What is the central question of this study? It is generally recognized that social isolation is associated with physical inactivity; however, is social isolation a direct determinant of decreased physical activity? What is the main finding and its importance? We conducted a within-subjects experiment with the aid of a body-implantable actimeter. Our results clearly demonstrated that social isolation decreased home-cage activity in mice. This might have resulted from increased immobility and decreased vigorous activity, suggesting that avoiding social isolation is important to preventing physical inactivity. ABSTRACT An inactive lifestyle can negatively affect physiological and mental health. Social isolation is associated with physical inactivity; however, it remains uncertain whether social isolation is a direct determinant of decreased physical activity. Hence, we assessed whether social isolation decreases home-cage activity using a within-subjects design and examined the effects of social isolation on hippocampal neurogenesis in mice. This study used a body-implantable actimeter called nanotag®, which enabled us to measure home-cage activity despite housing the mice in groups. We first examined the influence of the intraperitoneal implantation of nanotag® on home-cage activity. Although nanotag® implantation decreased home-cage activity temporarily, 7 days post-implantation, it recovered to the same level as that of control (non-implanted) mice, suggesting that implantation of nanotag® does not have a negative influence on home-cage activity if mice undergo a 1-week recovery period after implantation. In the main experiment, after the 1-week baseline measurement performed while in group housing, the mice were placed in a group or in isolation. Home-cage activity was measured for an additional 4 weeks. Home-cage activity in isolated mice during the dark period decreased by 26% from pre-intervention to the last week of intervention. Furthermore, the reduction in the number of 5-minute epochs during which the activity count exceeded 301 (an index of vigorous activity) was significantly larger for isolated mice. Contrary to expectations, social isolation did not impair hippocampal neurogenesis. Our results demonstrate that social isolation is a direct determinant of decreased physical activity, possibly because of reduced vigorous physical activity. This article is protected by copyright. All rights reserved.
Collapse
Affiliation(s)
- Daisuke Funabashi
- Department of Health Promotion Science, Graduate School of Human Health Science, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo, 192-0397, Japan
| | - Yusuke Wakiyama
- Department of Health Promotion Science, Graduate School of Human Health Science, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo, 192-0397, Japan
| | - Naoya Muto
- Department of Health Promotion Science, Graduate School of Human Health Science, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo, 192-0397, Japan
| | - Ichiro Kita
- Department of Health Promotion Science, Graduate School of Human Health Science, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo, 192-0397, Japan
| | - Takeshi Nishijima
- Department of Health Promotion Science, Graduate School of Human Health Science, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo, 192-0397, Japan
| |
Collapse
|
8
|
Podolan M, Dos Santos J, Walber T, Possamai F, Viola GG, Lino de Oliveira C. A single injection of imipramine affected proliferation in the hippocampus of adult Swiss mice depending on the route of administration, doses, survival time and lodging conditions. J Chem Neuroanat 2019; 100:101655. [PMID: 31202729 DOI: 10.1016/j.jchemneu.2019.101655] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 04/03/2019] [Accepted: 06/12/2019] [Indexed: 12/18/2022]
Abstract
Swiss mice may be valuable for the screening of antidepressants in preclinical trials. Acute treatment with antidepressants may affect the behaviour of Swiss mice, but the effects on their hippocampal neurogenesis remain unknown. The present work aims to assess the influence of acute treatment with antidepressants on cell proliferation in the dentate gyrus of the hippocampus of adult Swiss mice. Cell proliferation was estimated by ex vivo counting of Ki-67 immunoreactive nuclei (Ki-67-ir) in the dentate gyrus of Swiss mice housed in standard or enriched environments, at survival-times 2 or 24 h after imipramine injection Independent of the experimental group, intraperitoneal imipramine (0 or 30 mg/kg) failed to change the number of Ki-67-ir in the hippocampus of mice. Through intracerebroventricular route, imipramine reduced the number of Ki-67-ir in the hippocampus of Swiss mice at the dose of 0.06 nmol and increased it at the dose 0.2 nmol. At the dose 0.2 nmol, not 0.06 nmol, imipramine increased the immunoreactivity to doublecortin (a marker for immature neurons) in the hippocampus of mice. The effects of intracerebroventricular injection of imipramine on neurogenesis markers were seen 24 h after the injection in mice housed in standard conditions. The effects of intracerebroventricular injection of imipramine on neurogenesis markers were absent in mice housed in enrichment or 2 h after the injection. These data suggest that acute treatment with imipramine may affect proliferation in the hippocampus of adult Swiss mice depending on the route of administration, doses, survival time and lodging conditions.
Collapse
Affiliation(s)
- Martina Podolan
- Programa de Pós-Graduação Multicêntrico em Ciências Fisiológicas, Departamento de Ciências Fisiológicas, Centro de Ciências Biológicas, Universidade, Federal de Santa Catarina - UFSC, Florianópolis, 88040-900, SC, Brazil; Departamento de Ciências Fisiológicas, Centro de Ciências Biológicas, Universidade, Federal de Santa Catarina - UFSC, CEP: 88040-900, Florianópolis, SC, Brazil.
| | - Juliano Dos Santos
- Programa de Pós-Graduação Multicêntrico em Ciências Fisiológicas, Departamento de Ciências Fisiológicas, Centro de Ciências Biológicas, Universidade, Federal de Santa Catarina - UFSC, Florianópolis, 88040-900, SC, Brazil.
| | - Thais Walber
- Programa de Pós-Graduação Multicêntrico em Ciências Fisiológicas, Departamento de Ciências Fisiológicas, Centro de Ciências Biológicas, Universidade, Federal de Santa Catarina - UFSC, Florianópolis, 88040-900, SC, Brazil.
| | - Fernanda Possamai
- Programa de Pós-Graduação Multicêntrico em Ciências Fisiológicas, Departamento de Ciências Fisiológicas, Centro de Ciências Biológicas, Universidade, Federal de Santa Catarina - UFSC, Florianópolis, 88040-900, SC, Brazil; Departamento de Ciências Fisiológicas, Centro de Ciências Biológicas, Universidade, Federal de Santa Catarina - UFSC, CEP: 88040-900, Florianópolis, SC, Brazil.
| | - Giordano Gubert Viola
- Programa de Pós-graduação em Ciências Fisiológicas, Departamento de Fisiologia, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil.
| | - Cilene Lino de Oliveira
- Programa de Pós-Graduação Multicêntrico em Ciências Fisiológicas, Departamento de Ciências Fisiológicas, Centro de Ciências Biológicas, Universidade, Federal de Santa Catarina - UFSC, Florianópolis, 88040-900, SC, Brazil; Departamento de Ciências Fisiológicas, Centro de Ciências Biológicas, Universidade, Federal de Santa Catarina - UFSC, CEP: 88040-900, Florianópolis, SC, Brazil.
| |
Collapse
|
9
|
Barros W, David M, Souza A, Silva M, Matos R. Can the effects of environmental enrichment modulate BDNF expression in hippocampal plasticity? A systematic review of animal studies. Synapse 2019; 73:e22103. [PMID: 31056812 DOI: 10.1002/syn.22103] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 04/28/2019] [Accepted: 04/29/2019] [Indexed: 12/11/2022]
Abstract
BACKGROUND AND AIM Environmental enrichment (EE) can be related to changes in the expression of brain-derived neurotrophic factor (BDNF) in the hippocampus of adult rodents. Exposure to EE may also induce neurogenesis in the dentate gyrus (DG). The aim of this systematic review was to analyze the current literature on the correlation between neurogenesis and BDNF expression in the hippocampal DG region resulting from exposure to EE, which is associated with changes in memory, in rodents. METHODS Bibliographic searches of the Medline/PubMed and ScienceDirect databases were carried out, and 334 studies were found. A predefined protocol was used and registered on PROSPERO, and 32 studies were included for qualitative synthesis. The PRISMA was used to report this systematic review. RESULTS Most of the included studies showed that there is little evidence in the literature demonstrating that memory changes resulting from EE are dependent on BDNF expression and that there is an induction of neurogenesis in the hippocampal DG. However, the observed increase in molecular expression levels and cell proliferation is dependent on the age, the timing and duration of exposure to EE. Regarding the methodological quality of the studies, the majority presented a risk of bias due to the high variability in the age of the animals. CONCLUSION There are few studies in the literature that correlate the molecular and cellular mechanisms involved in neurogenesis in the hippocampal DG with BDNF expression in this region in rodents exposed to EE; however, there are other factors that can modulate this neurogenesis.
Collapse
Affiliation(s)
- Waleska Barros
- Programa de Pós-Graduação em Neuropsiquiatria e Ciências do Comportamento, Universidade Federal de Pernambuco (UFPE), Recife, Brazil.,CITENC (Centro integrado de tecnologia em neurociência), Centro Integrado de Tecnologia e Pesquisa (CINTEP) - Centro Universitário Osman Lins (FACOL), Vitória de Santo Antão, Brazil
| | - Mirian David
- Programa de Pós-Graduação em Neuropsiquiatria e Ciências do Comportamento, Universidade Federal de Pernambuco (UFPE), Recife, Brazil
| | - Ana Souza
- Fisioterapia, Centro Universitário Osman Lins (FACOL), Vitória de Santo Antão, Brazil
| | - Mariluce Silva
- Fisioterapia, Centro Universitário Osman Lins (FACOL), Vitória de Santo Antão, Brazil
| | - Rhowena Matos
- Programa de Pós-Graduação em Neuropsiquiatria e Ciências do Comportamento, Universidade Federal de Pernambuco (UFPE), Recife, Brazil.,Núcleo de Educação Física e Ciências do Esporte, Universidade Federal de Pernambuco Centro Acadêmico de Vitória (CAV), Vitória de Santo Antão, Brazil
| |
Collapse
|
10
|
Zhang XQ, Mu JW, Wang HB, Jolkkonen J, Liu TT, Xiao T, Zhao M, Zhang CD, Zhao CS. Increased protein expression levels of pCREB, BDNF and SDF-1/CXCR4 in the hippocampus may be associated with enhanced neurogenesis induced by environmental enrichment. Mol Med Rep 2016; 14:2231-7. [DOI: 10.3892/mmr.2016.5470] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Accepted: 05/31/2016] [Indexed: 11/06/2022] Open
|
11
|
Loss CM, Binder LB, Muccini E, Martins WC, de Oliveira PA, Vandresen-Filho S, Prediger RD, Tasca CI, Zimmer ER, Costa-Schmidt LE, de Oliveira DL, Viola GG. Influence of environmental enrichment vs. time-of-day on behavioral repertoire of male albino Swiss mice. Neurobiol Learn Mem 2015; 125:63-72. [PMID: 26247375 DOI: 10.1016/j.nlm.2015.07.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 06/30/2015] [Accepted: 07/24/2015] [Indexed: 11/19/2022]
Abstract
Environmental enrichment (EE) is a non-pharmacological manipulation that promotes diverse forms of benefits in the central nervous system of captive animals. It is thought that EE influences animal behavior in a specie-(strain)-specific manner. Since rodents in general present different behaviors during distinct periods of the day, in this study we aimed to investigate the influence of time-of-day on behavioral repertoire of Swiss mice that reared in EE. Forty male Swiss mice (21days old) were housed in standard (SC) or enriched conditions (EC) for 60days. Behavioral assessments were conducted during the light phase (in presence of light) or dark phase (in absence of light) in the following tasks: open field, object recognition and elevated plus maze. First, we observed that the locomotor and exploratory activities are distinct between SC and EC groups only during the light phase. Second, we observed that "self-protective behaviors" were increased in EC group only when mice were tested during the light phase. However, "less defensive behaviors" were not affected by both housing conditions and time-of-day. Third, we showed that the performance of EE animals in object recognition task was improved in both light and dark conditions. Our findings highlight that EE-induced alterations in exploratory and emotional behaviors are just evident during light conditions. However, EE-induced cognitive benefits are remarkable even during dark conditions, when exploratory and emotional behaviors were similar between groups.
Collapse
Affiliation(s)
- Cássio Morais Loss
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
| | - Luisa Bandeira Binder
- Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil.
| | - Eduarda Muccini
- Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil.
| | - Wagner Carbolin Martins
- Programa de Pós-Graduação em Neurociências, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil.
| | | | - Samuel Vandresen-Filho
- Programa de Pós-Graduação em Neurociências, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil; Departamento de Ciências Básicas em Saúde, Faculdade de Medicina, Universidade Federal de Mato Grosso, Cuiabá, MT, Brazil.
| | - Rui Daniel Prediger
- Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil.
| | - Carla Inês Tasca
- Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil; Programa de Pós-Graduação em Neurociências, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil.
| | - Eduardo R Zimmer
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
| | - Luiz Ernesto Costa-Schmidt
- Laboratorio de Biología Reproductiva y Evolución, Instituto de Diversidad y Ecología Animal - IDEA/CONICET, Universidad Nacional de Córdoba - UNC, Vélez Sarsfield 299, 5000 Córdoba, Argentina; Programa de Pós-Graduação em Biologia, Universidade do Vale do Rio dos Sinos - UNISINOS, São Leopoldo, RS, Brazil.
| | - Diogo Losch de Oliveira
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
| | - Giordano Gubert Viola
- Programa de Pós-Graduação em Neurociências, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil; Universidade Federal de Santa Catarina, Campus Curitibanos, Curitibanos, SC, Brazil; Programa de Pós-Graduação em Ciências Fisiológicas, Centro de Ciências Biológica, Universidade Federal do Sergipe, São Cristóvão, SE, Brazil.
| |
Collapse
|
12
|
Amiri S, Haj-Mirzaian A, Rahimi-Balaei M, Razmi A, Kordjazy N, Shirzadian A, Ejtemaei Mehr S, Sianati H, Dehpour AR. Co-occurrence of anxiety and depressive-like behaviors following adolescent social isolation in male mice; possible role of nitrergic system. Physiol Behav 2015; 145:38-44. [DOI: 10.1016/j.physbeh.2015.03.032] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 02/28/2015] [Accepted: 03/19/2015] [Indexed: 10/23/2022]
|
13
|
Leger M, Paizanis E, Dzahini K, Quiedeville A, Bouet V, Cassel JC, Freret T, Schumann-Bard P, Boulouard M. Environmental Enrichment Duration Differentially Affects Behavior and Neuroplasticity in Adult Mice. Cereb Cortex 2014; 25:4048-61. [DOI: 10.1093/cercor/bhu119] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
|
14
|
Cognitive Reserve and Alzheimer’s Disease. Mol Neurobiol 2014; 51:187-208. [DOI: 10.1007/s12035-014-8720-y] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2014] [Accepted: 04/17/2014] [Indexed: 12/13/2022]
|
15
|
Monteiro BM, Moreira FA, Massensini AR, Moraes MF, Pereira GS. Enriched environment increases neurogenesis and improves social memory persistence in socially isolated adult mice. Hippocampus 2013; 24:239-48. [DOI: 10.1002/hipo.22218] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Revised: 09/25/2013] [Accepted: 09/25/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Brisa M.M. Monteiro
- Núcleo de Neurociências; Departamento de Fisiologia e Biofísica; Universidade Federal de Minas Gerais; Brazil
| | | | - André R. Massensini
- Núcleo de Neurociências; Departamento de Fisiologia e Biofísica; Universidade Federal de Minas Gerais; Brazil
| | - Márcio F.D. Moraes
- Núcleo de Neurociências; Departamento de Fisiologia e Biofísica; Universidade Federal de Minas Gerais; Brazil
| | - Grace S. Pereira
- Núcleo de Neurociências; Departamento de Fisiologia e Biofísica; Universidade Federal de Minas Gerais; Brazil
| |
Collapse
|
16
|
A sensitive period for GABAergic interneurons in the dentate gyrus in modulating sensorimotor gating. J Neurosci 2013; 33:6691-704. [PMID: 23575865 DOI: 10.1523/jneurosci.0032-12.2013] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Developmental perturbations during adolescence have been hypothesized to be a risk factor for the onset of several neuropsychiatric diseases. However the physiological alterations that result from such insults are incompletely understood. We investigated whether a defined perturbation during adolescence affected hippocampus-dependent sensorimotor gating functions, a proposed endophenotype in several psychiatric diseases, most notably schizophrenia. The developmental perturbation was induced during adolescence in mice using an antimitotic agent, methylazoxymethanol acetate (MAM), during postnatal weeks (PW) 4-6. MAM-treated mice showed a decrease in hippocampal neurogenesis immediately after treatment, which was restored by PW10 in adulthood. However, the mice treated with MAM during adolescent stages exhibited a persistent sensorimotor gating deficiency and a reduction in prepulse inhibition-related activation of hippocampal and prefrontal neurons in adulthood. Cellular analyses found a reduction of GABAergic inhibitory neurons and abnormal dendritic morphology of immature neurons in the dentate gyrus (DG). Interestingly, bilateral infusion of muscimol, a GABAA receptor agonist, into the DG region reversed the prepulse inhibition abnormality in MAM-treated mice. Furthermore, the behavioral deficits together with the decrease in the number of GABAergic neurons in this MAM model were rescued by exposure to an enriched environment during a defined critical adolescent period. These observations suggest a possible role for GABAergic interneurons in the DG during adolescence. This role may be related to the establishment of neural circuitry required for sensorimotor gating. It is plausible that changes in neurogenesis during this window may affect the survival of GABAergic interneurons, although this link needs to be causally addressed.
Collapse
|
17
|
Fuss J, Richter SH, Steinle J, Deubert G, Hellweg R, Gass P. Are you real? Visual simulation of social housing by mirror image stimulation in single housed mice. Behav Brain Res 2013; 243:191-8. [PMID: 23333841 DOI: 10.1016/j.bbr.2013.01.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 01/07/2013] [Accepted: 01/11/2013] [Indexed: 01/19/2023]
Abstract
Individual housing of social species is a common phenomenon in laboratory animal facilities. Single housing, however, is known to inflict social deprivation with a number of detrimental consequences. Aiming to improve housing conditions of single housed rodents, we investigated the simulation of social housing by mirrors in a series of behavioural experiments and biochemical parameters in mice. We found that chronic mirror-image stimulation increased exploratory behaviours in the holeboard and novel cage tests, but did not alter anxiety, locomotor, or depression-like behaviours. Moreover, no influence on visual recognition memory was observed. Hippocampal brain-derived neurotrophic factor (BDNF) levels, a biomarker for enrichment effects, were unaltered. In line, mirror-image stimulation did not alter home cage behaviour in mice housed with and without mirrors when left undisturbed. Thus, though we found subtle behavioural effects after long-term mirror exposure, we conclude that the simulation of social housing by mirrors is not sufficient to gain the presumably beneficial outcomes induced by social housing.
Collapse
Affiliation(s)
- Johannes Fuss
- RG Animal Models in Psychiatry, Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, J 5, 68159 Mannheim, Germany.
| | | | | | | | | | | |
Collapse
|
18
|
Distribution and characterization of doublecortin-expressing cells and fibers in the brain of the adult pigeon (Columba livia). J Chem Neuroanat 2013; 47:57-70. [DOI: 10.1016/j.jchemneu.2012.10.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Revised: 10/29/2012] [Accepted: 10/29/2012] [Indexed: 01/03/2023]
|
19
|
Early-life social experiences in mice affect emotional behaviour and hypothalamic-pituitary-adrenal axis function. Pharmacol Biochem Behav 2012; 102:434-41. [DOI: 10.1016/j.pbb.2012.06.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 05/08/2012] [Accepted: 06/02/2012] [Indexed: 11/23/2022]
|
20
|
Social isolation produces anxiety-like behaviors and changes PSD-95 levels in the forebrain. Neurosci Lett 2012; 514:27-30. [PMID: 22387065 DOI: 10.1016/j.neulet.2012.02.043] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2012] [Accepted: 02/12/2012] [Indexed: 11/20/2022]
Abstract
Isolation rearing induces profound behavioral and neurochemical abnormalities in rodents. However there have been many controversies with its anxiogenic-like effects using models like elevated-plus maze. In the current study we aimed to address this by using one novelty-based anxiety paradigm that has been largely overlooked in previous isolation rearing studies. We found that eight-week isolation rearing produced potent anxiogenic-like effects in novelty-induced hypophagia test in mice. We also demonstrated PSD-95 levels were elevated in the hippocampus and amygdala and reduced in the frontal cortex after social isolation. This study provides further behavioral and neurochemical evidence to support that isolation rearing can produce anxiogenic-like effects in rodents.
Collapse
|