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Robertson KV, Rodriguez AS, Cartailler JP, Shrestha S, Schleh MW, Schroeder KR, Valenti AM, Kramer AT, Harrison FE, Hasty AH. Knockdown of microglial iron import gene, Slc11a2, worsens cognitive function and alters microglial transcriptional landscape in a sex-specific manner in the APP/PS1 model of Alzheimer's disease. J Neuroinflammation 2024; 21:238. [PMID: 39334471 PMCID: PMC11438269 DOI: 10.1186/s12974-024-03238-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2024] [Accepted: 09/19/2024] [Indexed: 09/30/2024] Open
Abstract
BACKGROUND Microglial cell iron load and inflammatory activation are significant hallmarks of late-stage Alzheimer's disease (AD). In vitro, microglia preferentially upregulate the iron importer, divalent metal transporter 1 (DMT1, gene name Slc11a2) in response to inflammatory stimuli, and excess iron can augment cellular inflammation, suggesting a feed-forward loop between iron import mechanisms and inflammatory signaling. However, it is not understood whether microglial iron import mechanisms directly contribute to inflammatory signaling and chronic disease in vivo. These studies determined the effects of microglial-specific knockdown of Slc11a2 on AD-related cognitive decline and microglial transcriptional phenotype. METHODS In vitro experiments and RT-qPCR were used to assess a role for DMT1 in amyloid-β-associated inflammation. To determine the effects of microglial Slc11a2 knockdown on AD-related phenotypes in vivo, triple-transgenic Cx3cr1Cre-ERT2;Slc11a2flfl;APP/PS1+or - mice were generated and administered corn oil or tamoxifen to induce knockdown at 5-6 months of age. Both sexes underwent behavioral analyses to assess cognition and memory (12-15 months of age). Hippocampal CD11b+ microglia were magnetically isolated from female mice (15-17 months) and bulk RNA-sequencing analysis was conducted. RESULTS DMT1 inhibition in vitro robustly decreased Aβ-induced inflammatory gene expression and cellular iron levels in conditions of excess iron. In vivo, Slc11a2KD APP/PS1 female, but not male, mice displayed a significant worsening of memory function in Morris water maze and a fear conditioning assay, along with significant hyperactivity compared to control WT and APP/PS1 mice. Hippocampal microglia from Slc11a2KD APP/PS1 females displayed significant increases in Enpp2, Ttr, and the iron-export gene, Slc40a1, compared to control APP/PS1 cells. Slc11a2KD cells from APP/PS1 females also exhibited decreased expression of markers associated with subsets of disease-associated microglia (DAMs), such as Apoe, Ctsb, Ly9, Csf1, and Hif1α. CONCLUSIONS This work suggests a sex-specific role for microglial iron import gene Slc11a2 in propagating behavioral and cognitive phenotypes in the APP/PS1 model of AD. These data also highlight an association between loss of a DAM-like phenotype in microglia and cognitive deficits in Slc11a2KD APP/PS1 female mice. Overall, this work illuminates an iron-related pathway in microglia that may serve a protective role during disease and offers insight into mechanisms behind disease-related sex differences.
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Affiliation(s)
- Katrina Volk Robertson
- Department of Molecular Physiology and Biophysics, Vanderbilt University, 702 Light Hall, Nashville, TN, USA
| | - Alec S Rodriguez
- Department of Molecular Physiology and Biophysics, Vanderbilt University, 702 Light Hall, Nashville, TN, USA
| | | | - Shristi Shrestha
- Creative Data Solutions, Vanderbilt Center for Stem Cell Biology, Nashville, TN, USA
| | - Michael W Schleh
- Department of Molecular Physiology and Biophysics, Vanderbilt University, 702 Light Hall, Nashville, TN, USA
| | - Kyle R Schroeder
- Department of Molecular Physiology and Biophysics, Vanderbilt University, 702 Light Hall, Nashville, TN, USA
| | - Arianna M Valenti
- Department of Molecular Physiology and Biophysics, Vanderbilt University, 702 Light Hall, Nashville, TN, USA
| | - Alec T Kramer
- Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN, USA
| | - Fiona E Harrison
- Department of Medicine, Vanderbilt University Medical Center, 7465 Medical Research Building IV, 2213 Garland Avenue, Nashville, TN, 37232, USA.
| | - Alyssa H Hasty
- Department of Molecular Physiology and Biophysics, Vanderbilt University, 702 Light Hall, Nashville, TN, USA.
- VA Tennessee Valley Healthcare System, Nashville, TN, USA.
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Alveal-Mellado D, Giménez-Llort L. Use of Ordered Beta Regression Unveils Cognitive Flexibility Index and Longitudinal Cognitive Training Signatures in Normal and Alzheimer's Disease Pathological Aging. Brain Sci 2024; 14:501. [PMID: 38790478 PMCID: PMC11119991 DOI: 10.3390/brainsci14050501] [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: 04/10/2024] [Revised: 05/07/2024] [Accepted: 05/11/2024] [Indexed: 05/26/2024] Open
Abstract
Generalized linear mixed models (GLMMs) are a cornerstone data analysis strategy in behavioral research because of their robustness in handling non-normally distributed variables. Recently, their integration with ordered beta regression (OBR), a novel statistical tool for managing percentage data, has opened new avenues for analyzing continuous response data. Here, we applied this combined approach to investigate nuanced differences between the 3xTg-AD model of Alzheimer's disease (AD) and their C57BL/6 non-transgenic (NTg) counterparts with normal aging in a 5-day Morris Water Maze (MWM) test protocol. Our longitudinal study included 22 3xTg-AD mice and 15 NTg mice (both male and female) assessed at 12 and 16 months of age. By identifying and analyzing multiple swimming strategies during three different paradigms (cue, place task, and removal), we uncovered genotypic differences in all paradigms. Thus, the NTg group exhibited a higher percentage of direct search behaviors, while an association between circling episodes and 3xTg-AD animals was found. Furthermore, we also propose a novel metric-the "Cognitive Flexibility Index"-which proved sensitive in detecting sex-related differences. Overall, our integrated GLMMs-OBR approach provides a comprehensive insight into mouse behavior in the MWM test, shedding light on the effects of aging and AD pathology.
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Affiliation(s)
- Daniel Alveal-Mellado
- Institut de Neurociències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain;
- Department of Psychiatry and Forensic Medicine, School of Medicine, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
| | - Lydia Giménez-Llort
- Institut de Neurociències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain;
- Department of Psychiatry and Forensic Medicine, School of Medicine, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
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Lippi SLP, Barkey RE, Rodriguez MN. High-fat diet negatively affects brain markers, cognitive behaviors, and noncognitive behaviors in the rTg4510 tau mouse model. Physiol Behav 2023; 271:114316. [PMID: 37543107 DOI: 10.1016/j.physbeh.2023.114316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 07/11/2023] [Accepted: 08/01/2023] [Indexed: 08/07/2023]
Abstract
Alzheimer's disease (AD) drastically impacts cognitive and noncognitive behaviors in both humans and animal models. Two hallmark proteins in AD, amyloid-β plaques and tau neurofibrillary tangles, accumulate in regions of the brain critical for learning and memory, including the hippocampus. Poor dietary choices have been shown to exacerbate cognitive deficits seen in AD. In this study, we assessed the effects of a high-fat diet (HFD - 60 kcal% fat) on cognitive & noncognitive behaviors as well as on brain markers in the rTg4510 tau mouse model. While all mice learned the Morris Water Maze (MWM) task, it was noted that on the last day of acquisition female tau mice had a significantly higher latency to find the platform than male tau mice (p < 0.01). Mice given the HFD spent significantly less time in the target quadrant than those given a control diet (CD) (p < 0.05). Tau mice showed impaired burrowing (p < 0.05) and nesting behaviors (p < 0.001) compared to WT mice and HFD administration worsened burrowing in tau mice. Tau mice exhibited greater levels of glial fibrillary acidic protein (GFAP) (p < 0.05) and significantly less hippocampal cell density than WT mice (p < 0.001). We observed trends of HFD mice having greater levels of GFAP and greater average tangle size than CD mice. These results highlight the importance of dietary choices, especially in older populations more susceptible to AD and its effects.
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Affiliation(s)
- Stephen L P Lippi
- University of Texas at San Antonio, Dept. Psychology, San Antonio, TX 78249, United States.
| | - Rachel E Barkey
- Pennsylvania State University College of Medicine, Dept. Neural and Behavioral Sciences, 700 HMC Crescent Road, Hershey, PA 17033, United States
| | - Mya N Rodriguez
- MD Anderson UTHealth Houston Graduate School of Biomedical Sciences, 6767 Bertner Ave, Houston, TX 77030, United States
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4
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Balu D, Valencia-Olvera AC, Islam Z, Mielczarek C, Hansen A, Perez Ramos TM, York J, LaDu MJ, Tai LM. APOE genotype and sex modulate Alzheimer's disease pathology in aged EFAD transgenic mice. Front Aging Neurosci 2023; 15:1279343. [PMID: 38020764 PMCID: PMC10644540 DOI: 10.3389/fnagi.2023.1279343] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 10/10/2023] [Indexed: 12/01/2023] Open
Abstract
Increasing evidence supports that age, APOE and sex interact to modulate Alzheimer's disease (AD) risk, however the underlying pathways are unclear. One way that AD risk factors may modulate cognition is by impacting amyloid beta (Aβ) accumulation as plaques, and/or neuroinflammation Therefore, the goal of the present study was to evaluate the extent to which age, APOE and sex modulate Aβ pathology, neuroinflammation and behavior in vivo. To achieve this goal, we utilized the EFAD mice, which express human APOE3 or APOE4 and have five familial AD mutations (FAD) that result in Aβ42 overproduction. We assessed Aβ levels, reactive glia and Morris water maze performance in 6-, 10-, 14-, and 18-month-old EFAD mice. Female APOE4 mice had the highest Aβ deposition, fibrillar amyloid deposits and neuroinflammation as well as earlier behavior deficits. Interestingly, we found that female APOE3 mice and male APOE4 mice had similar levels of pathology. Collectively our data support that the combination of APOE4 and female sex is the most detrimental combination for AD, and that at older ages, female sex may be equivalent to APOE4 genotype.
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Affiliation(s)
- Deebika Balu
- Department of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL, United States
| | - Ana C. Valencia-Olvera
- Department of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL, United States
| | - Zarak Islam
- Department of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL, United States
- University of Illinois College of Medicine, Chicago, IL, United States
| | - Clare Mielczarek
- Department of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL, United States
| | - Allison Hansen
- Department of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL, United States
- University of Illinois College of Medicine, Peoria, IL, United States
| | - Tamara M. Perez Ramos
- Department of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL, United States
- School of Medicine, St. George’s University, St. George’s, Grenada
| | - Jason York
- Department of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL, United States
| | - Mary Jo LaDu
- Department of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL, United States
| | - Leon M. Tai
- Department of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL, United States
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Williams E, Mutlu-Smith M, Alex A, Chin XW, Spires-Jones T, Wang SH. Mid-Adulthood Cognitive Training Improves Performance in a Spatial Task but Does Not Ameliorate Hippocampal Pathology in a Mouse Model of Alzheimer's Disease. J Alzheimers Dis 2023; 93:683-704. [PMID: 37066912 DOI: 10.3233/jad-221185] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
Abstract
BACKGROUND Prior experience in early life has been shown to improve performance in aging and mice with Alzheimer's disease (AD) pathology. However, whether cognitive training at a later life stage would benefit subsequent cognition and reduce pathology in AD mice needs to be better understood. OBJECTIVE This study aimed to verify if behavioral training in mid-adulthood would improve subsequent cognition and reduce AD pathology and astrogliosis. METHODS Mixed-sex APP/PS1 and wildtype littermate mice received a battery of behavioral training, composed of spontaneous alternation in the Y-maze, novel object recognition and location tasks, and spatial training in the water maze, or handling only at 7 months of age. The impact of AD genotype and prior training on subsequent learning and memory of aforementioned tasks were assessed at 9 months. RESULTS APP/PS1 mice made more errors than wildtype littermates in the radial-arm water maze (RAWM) task. Prior training prevented this impairment in APP/PS1 mice. Prior training also contributed to better efficiency in finding the escape platform in both APP/PS1 mice and wildtype littermates. Short-term and long-term memory of this RAWM task, of a reversal task, and of a transfer task were comparable among APP/PS1 and wildtype mice, with or without prior training. Amyloid pathology and astrogliosis in the hippocampus were also comparable between the APP/PS1 groups. CONCLUSION These data suggest that cognitive training in mid-adulthood improves subsequent accuracy in AD mice and efficiency in all mice in the spatial task. Cognitive training in mid-adulthood provides no clear benefit on memory or on amyloid pathology in midlife.
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Affiliation(s)
- Elizabeth Williams
- Centre for Clinical Brain Sciences, The University of Edinburgh, Edinburgh, UK
| | - Menekşe Mutlu-Smith
- Centre for Clinical Brain Sciences, The University of Edinburgh, Edinburgh, UK
| | - Ashli Alex
- Centre for Clinical Brain Sciences, The University of Edinburgh, Edinburgh, UK
| | - Xi Wei Chin
- Centre for Clinical Brain Sciences, The University of Edinburgh, Edinburgh, UK
| | - Tara Spires-Jones
- Centre for Discovery Brain Sciences, UK Dementia Research Institute, The University of Edinburgh, Edinburgh, UK
| | - Szu-Han Wang
- Centre for Clinical Brain Sciences, The University of Edinburgh, Edinburgh, UK
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Xiao QY, Ye TY, Wang XL, Qi DM, Cheng XR. Effects of Qi-Fu-Yin on aging of APP/PS1 transgenic mice by regulating the intestinal microbiome. Front Cell Infect Microbiol 2023; 12:1048513. [PMID: 36710967 PMCID: PMC9880330 DOI: 10.3389/fcimb.2022.1048513] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 12/23/2022] [Indexed: 01/14/2023] Open
Abstract
Introduction Alzheimer's disease is the most common form of dementia and closely related to aging. Qi-Fu-Yin is widely used to treat dementia, but its anti-aging effects is unknown. Methods We used 11-month-old APP/PS1 transgenic mice for behavioral tests to observe the changes in cognitive function and age-related symptoms after Qi-Fu-Yin treatment. Fecal samples were collected for 16sRNA sequencing and metagenomic sequencing. Differences among the groups of intestinal microbiota and the associations with aging and intestinal microbiota were analyzed based on the results. Results Here we found that Qi-Fu-Yin improved the ability of motor coordination, raised survival rate and prolonged the survival days under cold stress stimulation in aged APP/ PS1 transgenic mice. Our data from 16sRNA and metagenomic sequencing showed that at the Family level, the intestinal microbiota was significantly different among wild-type mice, APP/PS1 transgenic mice and the Qi-Fu-Yin group by PCA analysis. Importantly, Qi-Fu-Yin improved the functional diversity of the major KEGG pathways, carbohydrate-active enzymes, and major virulence factors in the intestinal flora of APP/PS1 transgenic mice. Among them, the functions of eight carbohydrate-active enzymes (GT2_Glycos_transf_2, GT4, GT41, GH2, CE1, CE10, CE3, and GH24) and the functions of top three virulence factors (defensive virulence factors, offensive virulence factors and nonspecific virulence factors) were significantly and positively correlated with the level of grasping ability. We further indicated that the Qi-Fu-Yin significantly reduced the plasma levels of IL-6. Conclusion Our results indicated that the effects of Qi-Fu-Yin anti-aging of APP/PS1 transgenic mice might be through the regulation of intestinal flora diversity, species richness and the function of major active enzymes.
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Affiliation(s)
- Qiu-yue Xiao
- Innovative Institute of Chinese Medicine and Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Tian-yuan Ye
- Innovative Institute of Chinese Medicine and Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Xiao-long Wang
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Dong-mei Qi
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Xiao-rui Cheng
- Innovative Institute of Chinese Medicine and Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, China
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7
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Sun HL, Feng Y, Zhang Q, Li JX, Wang YY, Su Z, Cheung T, Jackson T, Sha S, Xiang YT. The Microbiome-Gut-Brain Axis and Dementia: A Bibliometric Analysis. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:16549. [PMID: 36554429 PMCID: PMC9779855 DOI: 10.3390/ijerph192416549] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 11/27/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
BACKGROUND Associations between the microbiome-gut-brain axis and dementia have attracted considerable attention in research literature. This study examined the microbiome-gut-brain axis and dementia-related research from a bibliometric perspective. METHODS A search for original research and review articles on the microbiome-gut-brain axis and dementia was conducted in the Web of Science Core Collection (WOSCC) database. The R package "bibliometrix" was used to collect information on countries, institutions, authors, journals, and keywords. VOSviewer software was used to visualize the co-occurrence network of keywords. RESULTS Overall, 494 articles met the study inclusion criteria, with an average of 29.64 citations per article. Corresponding authors of published articles were mainly from China, the United States and Italy. Zhejiang University in China and Kyung Hee University in Korea were the most active institutions, while the Journal of Alzheimer's Disease and Nutrients published the most articles in this field. Expected main search terms, "Parkinson disease" and "chain fatty-acids" were high-frequency keywords that indicate current and future research directions in this field. CONCLUSIONS This bibliometric study helped researchers to identify the key topics and trends in the microbiome-gut-brain axis and dementia-related research. High-frequency keywords identified in this study reflect current trends and possible future directions in this field related to methodologies, mechanisms and populations of interest.
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Affiliation(s)
- He-Li Sun
- Unit of Psychiatry, Department of Public Health and Medicinal Administration, Institute of Translational Medicine, Faculty of Health Sciences, University of Macau, Macao SAR, China
- Centre for Cognitive and Brain Sciences, University of Macau, Macao SAR, China
| | - Yuan Feng
- The National Clinical Research Center for Mental Disorders, Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing 100054, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing 100054, China
| | - Qinge Zhang
- The National Clinical Research Center for Mental Disorders, Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing 100054, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing 100054, China
| | - Jia-Xin Li
- Centre for Cognitive and Brain Sciences, University of Macau, Macao SAR, China
| | - Yue-Ying Wang
- Centre for Cognitive and Brain Sciences, University of Macau, Macao SAR, China
| | - Zhaohui Su
- School of Public Health, Institute for Human Rights, Southeast University, Nanjing 210096, China
| | - Teris Cheung
- School of Nursing, Hong Kong Polytechnic University, Hong Kong SAR, China
| | - Todd Jackson
- Department of Psychology, University of Macau, Macao SAR, China
| | - Sha Sha
- The National Clinical Research Center for Mental Disorders, Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing 100054, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing 100054, China
| | - Yu-Tao Xiang
- Unit of Psychiatry, Department of Public Health and Medicinal Administration, Institute of Translational Medicine, Faculty of Health Sciences, University of Macau, Macao SAR, China
- Centre for Cognitive and Brain Sciences, University of Macau, Macao SAR, China
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Assessment of sex-related neuropathology and cognitive deficits in the Tg-SwDI mouse model of Alzheimer’s disease. Behav Brain Res 2022; 428:113882. [DOI: 10.1016/j.bbr.2022.113882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 03/17/2022] [Accepted: 04/03/2022] [Indexed: 11/21/2022]
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Yang B, He M, Chen X, Sun M, Pan T, Xu X, Zhang X, Gong Q, Zhao Y, Jin Z, Cheng Z. Acupuncture Effect Assessment in APP/PS1 Transgenic Mice: On Regulating Learning-Memory Abilities, Gut Microbiota, and Microbial Metabolites. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2022; 2022:1527159. [PMID: 35432583 PMCID: PMC9012623 DOI: 10.1155/2022/1527159] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 03/02/2022] [Indexed: 12/12/2022]
Abstract
Alzheimer's disease (AD) is a brain illness that affects learning and memory capacities over time. In recent investigations, acupuncture has been shown to be an effective alternative treatment for AD. We investigated the effect of acupuncture on learning and memory abilities using a water maze in APP/PS1 transgenic mice. The amounts of Aβ and tau protein in mice's hippocampal tissue were determined using Western blot. The levels of IL-1β, IL-10, LPS and TNF-α in mice's serum were measured using ELISA. The variations of gut microbiota in mice's feces were determined using the 16SrDNA technique, and the metabolites were examined using a untargeted metabolomics methodology. The results showed that acupuncture treatment improved mice's learning and memory abilities substantially. Acupuncture therapy regulated the Aβ and tau protein concentration as well as the levels of IL-10 and LPS. Acupuncture treatment influenced the mouse microbiota and metabolites and had been linked to six biochemical pathways. This study adds to our understanding of the effect of acupuncture on AD and opens the door to further research into the alterations of intestinal bacteria in the presence of AD.
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Affiliation(s)
- Bo Yang
- Liaoning University of Traditional Chinese Medicine, No. 79, Chongshan Eastern Rd, Huanggu District, 110847 Shenyang, China
- Changchun University of Chinese Medicine, No. 1035, Boshuo Rd, Jingyue Economic Development District, 130117 Changchun, China
| | - Min He
- Changchun University of Chinese Medicine, No. 1035, Boshuo Rd, Jingyue Economic Development District, 130117 Changchun, China
| | - Xinhua Chen
- Changchun University of Chinese Medicine, No. 1035, Boshuo Rd, Jingyue Economic Development District, 130117 Changchun, China
| | - Mengmeng Sun
- Changchun University of Chinese Medicine, No. 1035, Boshuo Rd, Jingyue Economic Development District, 130117 Changchun, China
| | - Ting Pan
- Changchun University of Chinese Medicine, No. 1035, Boshuo Rd, Jingyue Economic Development District, 130117 Changchun, China
| | - Xiaohong Xu
- Changchun University of Chinese Medicine, No. 1035, Boshuo Rd, Jingyue Economic Development District, 130117 Changchun, China
| | - Xuesong Zhang
- Changchun University of Chinese Medicine, No. 1035, Boshuo Rd, Jingyue Economic Development District, 130117 Changchun, China
| | - Qing Gong
- Changchun University of Chinese Medicine, No. 1035, Boshuo Rd, Jingyue Economic Development District, 130117 Changchun, China
| | - Ye Zhao
- Northwest University, No. 229, Taibai North Road, Xi' an 710069, China
| | - Ziqi Jin
- Changchun University of Chinese Medicine, No. 1035, Boshuo Rd, Jingyue Economic Development District, 130117 Changchun, China
| | - Zedong Cheng
- Liaoning University of Traditional Chinese Medicine, No. 79, Chongshan Eastern Rd, Huanggu District, 110847 Shenyang, China
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Long-term running exercise alleviates cognitive dysfunction in APP/PSEN1 transgenic mice via enhancing brain lysosomal function. Acta Pharmacol Sin 2022; 43:850-861. [PMID: 34272505 DOI: 10.1038/s41401-021-00720-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 06/17/2021] [Indexed: 11/08/2022] Open
Abstract
Amyloid-β peptide (Aβ) aggregation is the hallmark of Alzheimer's disease (AD). The imbalance between the production and clearance of Aβ results in the accumulation and aggregation of Aβ in the brain. Thus far, few drugs are available for AD treatment, but exercise has been recognized for its cognition-enhancing properties in AD patients. The underlying mechanisms remain unclear. Our recent study showed that long-term running exercise could activate the lysosomal function in the brains of mice. In this study, we investigated whether exercise could reduce Aβ accumulation by activating lysosomal function in APP/PSEN1 transgenic mice. Started at the age of 5 months, the mice were trained with a running wheel at the speed of 18 r/min, 40 min/d, 6 d/week for 5 months, and were killed at the end of the 10th month, then brain tissue was collected for biochemical analyses. The cognitive ability was assessed in the 9th month. We showed that long-term exercise significantly mitigated cognitive dysfunction in AD mice, accompanied by the enhanced lysosomal function and the clearance of Aβ in the brain. Exercise significantly promoted the nuclear translocation of transcription factor EB (TFEB), and increased the interaction between nuclear TFEB with AMPK-mediated acetyl-CoA synthetase 2, thus enhancing transcription of the genes associated with the biogenesis of lysosomes. Exercise also raised the levels of mature cathepsin D and cathepsin L, suggesting that more Aβ peptides could be degraded in the activated lysosomes. This study demonstrates that exercise may improve the cognitive dysfunction of AD by enhancing lysosomal function.
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Wang T, Chen Y, Zou Y, Pang Y, He X, Chen Y, Liu Y, Feng W, Zhang Y, Li Q, Shi J, Ding F, Marshall C, Gao J, Xiao M. Locomotor Hyperactivity in the Early-Stage Alzheimer’s Disease-like Pathology of APP/PS1 Mice: Associated with Impaired Polarization of Astrocyte Aquaporin 4. Aging Dis 2022; 13:1504-1522. [PMID: 36186142 PMCID: PMC9466968 DOI: 10.14336/ad.2022.0219] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 02/19/2022] [Indexed: 12/21/2022] Open
Abstract
Non-cognitive behavioral and psychological symptoms often occur in Alzheimer's disease (AD) patients and mouse models, although the exact neuropathological mechanism remains elusive. Here, we report hyperactivity with significant inter-individual variability in 4-month-old APP/PS1 mice. Pathological analysis revealed that intraneuronal accumulation of amyloid-β (Aβ), c-Fos expression in glutamatergic neurons and activation of astrocytes were more evident in the frontal motor cortex of hyperactive APP/PS1 mice, compared to those with normal activity. Moreover, the hyperactive phenotype was associated with mislocalization of perivascular aquaporin 4 (AQP4) and glymphatic transport impairment. Deletion of the AQP4 gene increased hyperactivity, intraneuronal Aβ load and glutamatergic neuron activation, but did not influence working memory or anxiety-like behaviors of 4-month-old APP/PS1 mice. Together, these results demonstrate that AQP4 mislocalization or deficiency leads to increased intraneuronal Aβ load and neuronal hyperactivity in the motor cortex, which in turn causes locomotor over-activity during the early pathophysiology of APP/PS1 mice. Therefore, improving AQP4 mediated glymphatic clearance may offer a new strategy for early intervention of hyperactivity in the prodromal phase of AD.
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Affiliation(s)
- Tianqi Wang
- Jiangsu Province Key Laboratory of Neurodegeneration, Center for Global Health, Nanjing Medical University, Nanjing, 211166, China.
- Brain Institute, the Affiliated Nanjing Brain Hospital of Nanjing Medical University, Nanjing, 210029, China.
| | - Yan Chen
- Jiangsu Province Key Laboratory of Neurodegeneration, Center for Global Health, Nanjing Medical University, Nanjing, 211166, China.
- Brain Institute, the Affiliated Nanjing Brain Hospital of Nanjing Medical University, Nanjing, 210029, China.
| | - Ying Zou
- Jiangsu Province Key Laboratory of Neurodegeneration, Center for Global Health, Nanjing Medical University, Nanjing, 211166, China.
| | - Yingting Pang
- Jiangsu Province Key Laboratory of Neurodegeneration, Center for Global Health, Nanjing Medical University, Nanjing, 211166, China.
| | - Xiaoxin He
- Jiangsu Province Key Laboratory of Neurodegeneration, Center for Global Health, Nanjing Medical University, Nanjing, 211166, China.
- Brain Institute, the Affiliated Nanjing Brain Hospital of Nanjing Medical University, Nanjing, 210029, China.
| | - Yali Chen
- Jiangsu Province Key Laboratory of Neurodegeneration, Center for Global Health, Nanjing Medical University, Nanjing, 211166, China.
- Department of Human Anatomy and Histoembryology, Nanjing University of Chinese Medicine, Nanjing, 210023, China.
| | - Yun Liu
- Jiangsu Province Key Laboratory of Neurodegeneration, Center for Global Health, Nanjing Medical University, Nanjing, 211166, China.
| | - Weixi Feng
- Jiangsu Province Key Laboratory of Neurodegeneration, Center for Global Health, Nanjing Medical University, Nanjing, 211166, China.
- Brain Institute, the Affiliated Nanjing Brain Hospital of Nanjing Medical University, Nanjing, 210029, China.
| | - Yanli Zhang
- Jiangsu Province Key Laboratory of Neurodegeneration, Center for Global Health, Nanjing Medical University, Nanjing, 211166, China.
| | - Qian Li
- Jiangsu Province Key Laboratory of Neurodegeneration, Center for Global Health, Nanjing Medical University, Nanjing, 211166, China.
- Brain Institute, the Affiliated Nanjing Brain Hospital of Nanjing Medical University, Nanjing, 210029, China.
| | - Jingping Shi
- Department of Neurology, the Affiliated Nanjing Brain Hospital of Nanjing Medical University, Nanjing, 210029, China.
| | - Fengfei Ding
- Department of Pharmacology, Shanghai Medical College, Fudan University, Shanghai, 200032, China.
| | - Charles Marshall
- College of Health Sciences, University of Kentucky Center of Excellence in Rural Health, Hazard, KY 41701, USA
| | - Junying Gao
- Jiangsu Province Key Laboratory of Neurodegeneration, Center for Global Health, Nanjing Medical University, Nanjing, 211166, China.
- Correspondence should be addressed to: Dr. Ming Xiao (E-mail: ) or Dr. Junying Gao (), Jiangsu Province Key Laboratory of Neurodegeneration, Nanjing Medical University, Nanjing, China
| | - Ming Xiao
- Jiangsu Province Key Laboratory of Neurodegeneration, Center for Global Health, Nanjing Medical University, Nanjing, 211166, China.
- Brain Institute, the Affiliated Nanjing Brain Hospital of Nanjing Medical University, Nanjing, 210029, China.
- Correspondence should be addressed to: Dr. Ming Xiao (E-mail: ) or Dr. Junying Gao (), Jiangsu Province Key Laboratory of Neurodegeneration, Nanjing Medical University, Nanjing, China
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12
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Li G, Wang Y, Cao F, Wang D, Zhou L, Jin Y. Sevoflurane Promotes Neurodegeneration Through Inflammasome Formation in APP/PS1 Mice. Front Neurosci 2021; 15:647136. [PMID: 34924922 PMCID: PMC8678053 DOI: 10.3389/fnins.2021.647136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 10/22/2021] [Indexed: 12/20/2022] Open
Abstract
Sevoflurane (SEVO) is a highly fluorinated methyl isopropyl ether used as an inhalational anesthetic for general anesthesia. Previous studies have shown that SEVO may induce impaired memory and recognition ability and may be associated with neurodegenerative disease, e.g., Alzheimer’s disease (AD). However, the underlying mechanism remains unknown. Here, we used a mouse AD model, APP/PS1, to study the effects of SEVO on neurodegeneration occurring in AD. We found that SEVO exposure significantly impaired the spatial reference memory, sensorimotor, and cognitive function of the mice. Mechanistically, we found that SEVO induced formation of NOD-, LRR- and pyrin domain-containing protein 3 (NLRP3) inflammasome and its downstream caspase 1-mediated production of IL-1β and IL-18, which subsequently deactivated brain-derived neurotrophic factor (BDNF) to promote neurodegeneration. Together, these data suggest that NLRP3 inflammasome is essential for SEVO-induced AD.
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Affiliation(s)
- Guohua Li
- Department of Anesthesiology, The Second Affiliated Hospital of Shandong First Medical University, Tai'an, China
| | - Yu Wang
- Department of Anesthesiology, The Second Affiliated Hospital of Shandong First Medical University, Tai'an, China
| | - Fang Cao
- Department of Orthopedics, The Second Affiliated Hospital of Shandong First Medical University, Tai'an, China
| | - Dawei Wang
- Department of Obstetrics, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Limin Zhou
- Department of Anesthesiology, The Second Affiliated Hospital of Shandong First Medical University, Tai'an, China
| | - Yanwu Jin
- Department of Anesthesiology, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
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13
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van Heusden FC, Palacín I Bonsón S, Stiedl O, Smit AB, van Kesteren RE. Longitudinal Assessment of Working Memory Performance in the APPswe/PSEN1dE9 Mouse Model of Alzheimer's Disease Using an Automated Figure-8-Maze. Front Behav Neurosci 2021; 15:655449. [PMID: 34054444 PMCID: PMC8155296 DOI: 10.3389/fnbeh.2021.655449] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 03/29/2021] [Indexed: 01/09/2023] Open
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disorder, with a long preclinical and prodromal phase. To enable the study of disease mechanisms, AD has been modeled in many transgenic animal lines and cognitive functioning has been tested using several widely used behavioral tasks. These tasks, however, are not always suited for repeated longitudinal testing and are often associated with acute stress such as animal transfer, handling, novelty, or stress related to the task itself. This makes it challenging to relate cognitive dysfunction in animal models to cognitive decline observed in AD patients. Here, we designed an automated figure-8-maze (F8M) to test mice in a delayed alternation task (DAT) in a longitudinal manner. Mice were rewarded when they entered alternate sides of the maze on subsequent trials. Automation as well as connection of the F8M set-up with a home cage reduces experimenter interference and minimizes acute stress, thus making it suitable for longitudinal testing and facilitating clinical translation. In the present study, we monitored cognitive functioning of 2-month-old APPswe/PSEN1dE9 (APP/PS1) mice over a period of 4 months. The percentage of correct responses in the DAT did not differ between wild-type and transgenic mice from 2 to 6 months of age. However, 6-month-old mice displayed an increase in the number of consecutive incorrect responses. These results demonstrate the feasibility of longitudinal testing using an automated F8M and suggest that APP/PS1 mice are not impaired at delayed spatial alternation until 6 months of age under the current experimental conditions.
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Affiliation(s)
- Fran C van Heusden
- Department of Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Sara Palacín I Bonsón
- Department of Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Oliver Stiedl
- Department of Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - August B Smit
- Department of Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Ronald E van Kesteren
- Department of Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Amsterdam Neuroscience, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
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14
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Chaudhari K, Wang L, Kruse J, Winters A, Sumien N, Shetty R, Prah J, Liu R, Shi J, Forster M, Yang SH. Early loss of cerebellar Purkinje cells in human and a transgenic mouse model of Alzheimer's disease. Neurol Res 2021; 43:570-581. [PMID: 33688799 DOI: 10.1080/01616412.2021.1893566] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND The cerebellum's involvement in AD has been under-appreciated by historically labeling as a normal control in AD research. METHODS We determined the involvement of the cerebellum in AD progression. Postmortem human and APPswe/PSEN1dE9 mice cerebellums were used to assess the cerebellar Purkinje cells (PC) by immunohistochemistry. The locomotor and spatial cognitive functions were assessed in 4- to 5-month-old APPswe/PSEN1dE9 mice. Aβ plaque and APP processing were determined in APPswe/PSEN1dE9 mice at different age groups by immunohistochemistry and Western blot. RESULTS We observed loss of cerebellar PC in mild cognitive impairment and AD patients compared with cognitively normal controls. A strong trend towards PC loss was found in AD mice as early as 5 months. Impairment of balance beam and rotorod performance, but no spatial learning and memory dysfunction was observed in AD mice at 4-5 months. Aβ plaque in the cerebral cortex was evidenced in AD mice at 2 months and dramatically increased at 6 months. Less and smaller Aβ plaques were observed in the cerebellum than in the cerebrum of AD mice. Similar intracellular APP staining was observed in the cerebellum and cerebrum of AD mice at 2 to 10 months. Similar expression of full-length APP and C-terminal fragments were indicated in the cerebrum and cerebellum of AD mice during aging. DISCUSSION Our study in post-mortem human brains and transgenic AD mice provided neuropathological and functional evidence that cerebellar dysfunction may occur at the early stage of AD and likely independent of Aβ plaque.
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Affiliation(s)
- Kiran Chaudhari
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, TX USA
| | - Linshu Wang
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, TX USA
| | - Jonas Kruse
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, TX USA
| | - Ali Winters
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, TX USA
| | - Nathalie Sumien
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, TX USA
| | - Ritu Shetty
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, TX USA
| | - Jude Prah
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, TX USA
| | - Ran Liu
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, TX USA
| | - Jiong Shi
- Lou Ruvo Center for Brain Health, Cleveland Clinic Nevada, 888 W Bonneville Avenue, Las Vegas, NV USA
| | - Michael Forster
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, TX USA
| | - Shao-Hua Yang
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, TX USA
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15
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Locci A, Orellana H, Rodriguez G, Gottliebson M, McClarty B, Dominguez S, Keszycki R, Dong H. Comparison of memory, affective behavior, and neuropathology in APP NLGF knock-in mice to 5xFAD and APP/PS1 mice. Behav Brain Res 2021; 404:113192. [PMID: 33607163 DOI: 10.1016/j.bbr.2021.113192] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Revised: 01/26/2021] [Accepted: 02/14/2021] [Indexed: 02/08/2023]
Abstract
Transgenic mouse models of Aβ amyloidosis generated by knock-in of a humanized Aβ sequence can offer some advantages over the transgenic models that overexpress amyloid precursor protein (APP). However, systematic comparison of memory, behavioral, and neuropathological phenotypes between these models has not been well documented. In this study, we compared memory and affective behavior in APPNLGF mice, an APP knock-in model, to two widely used mouse models of Alzheimer's disease, 5xFAD and APP/PS1 mice, at 10 months of age. We found that, despite similar deficits in working memory, object recognition, and social recognition memory, APPNLGF and 5xFAD mice but not APP/PS1 mice show compelling anxiety- and depressive-like behavior, and exhibited a marked impairment of social interaction. We quantified corticolimbic Aβ plaques, which were lowest in APPNLGF, intermediate in APP/PS1, and highest in 5xFAD mice. Interestingly, analysis of plaque size revealed that plaques were largest in APP/PS1 mice, intermediate in 5xFAD mice, and smallest in APPNLGF mice. Finally, we observed a significantly higher percentage of the area occupied by plaques in both 5xFAD and APP/PS1 relative to APPNLGF mice. Overall, our findings suggest that the severity of Aβ neuropathology is not directly correlated with memory and affective behavior impairments between these three transgenic mouse models. Additionally, APPNLGF may represent a valid mouse model for studying AD comorbid with anxiety and depression.
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Affiliation(s)
- Andrea Locci
- Department of Psychiatry and Behavioral Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA
| | - Hector Orellana
- Department of Psychiatry and Behavioral Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA
| | - Guadalupe Rodriguez
- Department of Psychiatry and Behavioral Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA
| | - Meredith Gottliebson
- Department of Psychiatry and Behavioral Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA
| | - Bryan McClarty
- Department of Psychiatry and Behavioral Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA
| | - Sky Dominguez
- Department of Psychiatry and Behavioral Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA
| | - Rachel Keszycki
- Department of Psychiatry and Behavioral Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA
| | - Hongxin Dong
- Department of Psychiatry and Behavioral Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA.
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16
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Salobrar-García E, López-Cuenca I, Sánchez-Puebla L, de Hoz R, Fernández-Albarral JA, Ramírez AI, Bravo-Ferrer I, Medina V, Moro MA, Saido TC, Saito T, Salazar JJ, Ramírez JM. Retinal Thickness Changes Over Time in a Murine AD Model APP NL-F/NL-F. Front Aging Neurosci 2021; 12:625642. [PMID: 33542683 PMCID: PMC7852550 DOI: 10.3389/fnagi.2020.625642] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 12/15/2020] [Indexed: 11/13/2022] Open
Abstract
Background: Alzheimer's disease (AD) may present retinal changes before brain pathology, suggesting the retina as an accessible biomarker of AD. The present work is a diachronic study using spectral domain optical coherence tomography (SD-OCT) to determine the total retinal thickness and retinal nerve fiber layer (RNFL) thickness in an APPNL−F/NL−F mouse model of AD at 6, 9, 12, 15, 17, and 20 months old compared to wild type (WT) animals. Methods: Total retinal thickness and RNFL thickness were determined. The mean total retinal thickness was analyzed following the Early Treatment Diabetic Retinopathy Study sectors. RNFL was measured in six sectors of axonal ring scans around the optic nerve. Results: In the APPNL−F/NL−F group compared to WT animals, the total retinal thickness changes observed were the following: (i) At 6-months-old, a significant thinning in the outer temporal sector was observed; (ii) at 15-months-old a significant thinning in the inner temporal and in the inner and outer inferior retinal sectors was noticed; (iii) at 17-months-old, a significant thickening in the inferior and nasal sectors was found in both inner and outer rings; and (iv) at 20-months-old, a significant thinning in the inner ring of nasal, temporal, and inferior retina and in the outer ring of superior and temporal retina was seen. In RNFL thickness, there was significant thinning in the global analysis and in nasal and inner-temporal sectors at 6 months old. Thinning was also found in the supero-temporal and nasal sectors and global value at 20 months old. Conclusions: In the APPNL−F/NL−F AD model, the retinal thickness showed thinning, possibly produced by neurodegeneration alternating with thickening caused by deposits and neuroinflammation in some areas of the retina. These changes over time are similar to those observed in the human retina and could be a biomarker for AD. The APPNL−F/NL−F AD model may help us better understand the different retinal changes during the progression of AD.
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Affiliation(s)
- Elena Salobrar-García
- Ramon Castroviejo Ophthalmological Research Institute, Complutense University of Madrid, Madrid, Spain.,Department of Immunology, Ophthalmology and Ear, Nose, and Throat, Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, Spain
| | - Inés López-Cuenca
- Ramon Castroviejo Ophthalmological Research Institute, Complutense University of Madrid, Madrid, Spain
| | - Lídia Sánchez-Puebla
- Ramon Castroviejo Ophthalmological Research Institute, Complutense University of Madrid, Madrid, Spain
| | - Rosa de Hoz
- Ramon Castroviejo Ophthalmological Research Institute, Complutense University of Madrid, Madrid, Spain.,Department of Immunology, Ophthalmology and Ear, Nose, and Throat, Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, Spain
| | - José A Fernández-Albarral
- Ramon Castroviejo Ophthalmological Research Institute, Complutense University of Madrid, Madrid, Spain
| | - Ana I Ramírez
- Ramon Castroviejo Ophthalmological Research Institute, Complutense University of Madrid, Madrid, Spain.,Department of Immunology, Ophthalmology and Ear, Nose, and Throat, Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, Spain
| | - Isabel Bravo-Ferrer
- Department of Pharmacology and Toxicology, Faculty of Medicine, Complutense University of Madrid, Madrid, Spain.,Edinburgh Medical School, UK Dementia Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Violeta Medina
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - María A Moro
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - Takaomi C Saido
- Laboratory for Proteolytic Neuroscience, Brain Science Institute, RIKEN, Wako, Japan
| | - Takashi Saito
- Department of Neurocognitive Science, Institute of Brain Science, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Juan J Salazar
- Ramon Castroviejo Ophthalmological Research Institute, Complutense University of Madrid, Madrid, Spain.,Department of Immunology, Ophthalmology and Ear, Nose, and Throat, Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, Spain
| | - José M Ramírez
- Ramon Castroviejo Ophthalmological Research Institute, Complutense University of Madrid, Madrid, Spain.,Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, Madrid, Spain
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17
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Van den Broeck L, Sierksma A, Hansquine P, Thonnard D, Callaerts-Vegh Z, D'Hooge R. Comparison between touchscreen operant chambers and water maze to detect early prefrontal dysfunction in mice. GENES BRAIN AND BEHAVIOR 2020; 20:e12695. [PMID: 32812350 DOI: 10.1111/gbb.12695] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 08/12/2020] [Accepted: 08/13/2020] [Indexed: 11/30/2022]
Abstract
The relative lack of sensitive and clinically valid tests of rodent behavior might be one of the reasons for the limited success of the clinical translation of preclinical Alzheimer's disease (AD) research findings. There is a general interest in innovative behavioral methodology, and protocols have been proposed for touchscreen operant chambers that might be superior to existing cognitive assessment methods. We assessed and analyzed touchscreen performance in several novel ways to examine the possible occurrence of early signs of prefrontal (PFC) functional decline in the APP/PS1 mouse model of AD. Touchscreen learning performance was compared between APP/PS1-21 mice and wildtype littermates on a C57BL/6J background at 3, 6 and 12 months of age in parallel to the assessment of spatial learning, memory and cognitive flexibility in the Morris water maze (MWM). We found that older mice generally needed more training sessions to complete the touchscreen protocol than younger ones. Older mice also displayed defects in MWM working memory performance, but touchscreen protocols detected functional changes beginning at 3 months of age. Histological changes in PFC of APP/PS1 mice indeed occurred as early as 3 months. Our results suggest that touchscreen operant protocols are more sensitive to PFC dysfunction, which is of relevance to the use of these tasks and devices in preclinical AD research and experimental pharmacology.
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Affiliation(s)
- Lore Van den Broeck
- Laboratory of Biological Psychology, University of Leuven (KU Leuven), Leuven, Belgium
| | - Annerieke Sierksma
- Laboratory for the Research of Neurodegenerative Diseases, VIB-KU Leuven Center for Brain and Disease Research, Leuven, Belgium
| | - Pierre Hansquine
- Laboratory of Biological Psychology, University of Leuven (KU Leuven), Leuven, Belgium
| | - David Thonnard
- Laboratory of Biological Psychology, University of Leuven (KU Leuven), Leuven, Belgium
| | | | - Rudi D'Hooge
- Laboratory of Biological Psychology, University of Leuven (KU Leuven), Leuven, Belgium
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18
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Neural compensation in presymptomatic hAPP mouse models of Alzheimer's disease. ACTA ACUST UNITED AC 2020; 27:390-394. [PMID: 32817305 PMCID: PMC7433654 DOI: 10.1101/lm.050401.119] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 06/26/2020] [Indexed: 11/25/2022]
Abstract
Largely inspired from clinical concepts like brain reserve, cognitive reserve, and neural compensation, here we review data showing how neural circuits reorganize in presymptomatic and early symptomatic hAPP mice to maintain memory intact. By informing on molecular alterations and compensatory adaptations which take place in the brain before mice show cognitive impairments, these data can help to identify ultra-early disease markers that could be targeted in a therapeutic perspective aimed at preventing rather than treating cognitive deterioration.
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19
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Wang L, Zeng L, Jiang H, Li Z, Liu R. Microarray Profile of Long Noncoding RNA and Messenger RNA Expression in a Model of Alzheimer's Disease. Life (Basel) 2020; 10:E64. [PMID: 32423012 PMCID: PMC7281340 DOI: 10.3390/life10050064] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 05/11/2020] [Accepted: 05/12/2020] [Indexed: 11/16/2022] Open
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disease characterized by a deficiency in cognitive skills. Although long noncoding RNAs (lncRNAs) have been proposed as associated with AD, the aberrant lncRNAs expression and the co-expression of lncRNAs-mRNAs network in AD remains unclear. Therefore, in this study, lncRNA microarray was performed on the brain of APP/PS1 mice at different age, widely used as an AD mouse model, and on age-matched wide-type controls. Our results identified a total of 3306 lncRNAs and 2458 mRNAs as aberrantly expressed among AD mice at different age and their age-matched control. Gene Ontology and pathway analysis of the AD-related lncRNAs and mRNAs indicated that neuroinflammation-related and synaptic transmission signaling pathways represented the main enriched pathways. An lncRNA-mRNA-miRNA network between the differentially expressed transcripts was constructed. Moreover, an mRNA-miRNA network between both significantly dysregulated and highly conserved genes was also constructed, and among this network, the IGF1, P2RX7, TSPO, SERPINE1, EGFR, HMOX1, and NFE212 genes were predicted to play a role in the development of AD. In conclusion, this study illustrated the prognostic value of lncRNAs and mRNAs associated to AD pathology by microarray analysis and might provide potential novel biomarkers in the diagnosis and treatment of AD.
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Affiliation(s)
| | | | | | - Zhuorong Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China; (L.W.); (L.Z.); (H.J.)
| | - Rui Liu
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China; (L.W.); (L.Z.); (H.J.)
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20
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Krivinko JM, Koppel J, Savonenko A, Sweet RA. Animal Models of Psychosis in Alzheimer Disease. Am J Geriatr Psychiatry 2020; 28:1-19. [PMID: 31278012 PMCID: PMC6858948 DOI: 10.1016/j.jagp.2019.05.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 04/29/2019] [Accepted: 05/13/2019] [Indexed: 12/13/2022]
Abstract
Psychosis in Alzheimer Disease (AD) represents a distinct clinicopathologic variant associated with increased cognitive and functional morbidity and an accelerated disease course. To date, extant treatments offer modest benefits with significant risks. The development of new pharmacologic treatments for psychosis in AD would be facilitated by validated preclinical models with which to test candidate interventions. The current review provides a brief summary of the process of validating animal models of human disease together with a critical analysis of the challenges posed in attempting to apply those standards to AD-related behavioral models. An overview of phenotypic analogues of human cognitive and behavioral impairments, with an emphasis on those relevant to psychosis, in AD-related mouse models is provided, followed by an update on recent progress in efforts to translate findings in the pathophysiology of psychotic AD into novel models. Finally, some future directions are suggested to expand the catalogue of psychosis-relevant phenotypes that may provide a sturdier framework for model development and targets for preclinical treatment outcomes.
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Affiliation(s)
- Josh M. Krivinko
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Jeremy Koppel
- The Litwin-Zucker Research Center for the Study of Alzheimer’s Disease, The Feinstein Institute for Medical Research, Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Manhasset, NY
| | - Alena Savonenko
- Department of Pathology, Johns Hopkins School of Medicine, Baltimore, MD
| | - Robert A. Sweet
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA,Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA,Mental Illness Research, Education, and Clinical Center, VA Pittsburgh Healthcare System, Pittsburgh, PA
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21
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Liu B, Hinshaw RG, Le KX, Park MA, Wang S, Belanger AP, Dubey S, Frost JL, Shi Q, Holton P, Trojanczyk L, Reiser V, Jones PA, Trigg W, Di Carli MF, Lorello P, Caldarone BJ, Williams JP, O'Banion MK, Lemere CA. Space-like 56Fe irradiation manifests mild, early sex-specific behavioral and neuropathological changes in wildtype and Alzheimer's-like transgenic mice. Sci Rep 2019; 9:12118. [PMID: 31431669 PMCID: PMC6702228 DOI: 10.1038/s41598-019-48615-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Accepted: 08/06/2019] [Indexed: 12/19/2022] Open
Abstract
Space travel will expose people to high-energy, heavy particle radiation, and the cognitive deficits induced by this exposure are not well understood. To investigate the short-term effects of space radiation, we irradiated 4-month-old Alzheimer’s disease (AD)-like transgenic (Tg) mice and wildtype (WT) littermates with a single, whole-body dose of 10 or 50 cGy 56Fe ions (1 GeV/u) at Brookhaven National Laboratory. At ~1.5 months post irradiation, behavioural testing showed sex-, genotype-, and dose-dependent changes in locomotor activity, contextual fear conditioning, grip strength, and motor learning, mainly in Tg but not WT mice. There was little change in general health, depression, or anxiety. Two months post irradiation, microPET imaging of the stable binding of a translocator protein ligand suggested no radiation-specific change in neuroinflammation, although initial uptake was reduced in female mice independently of cerebral blood flow. Biochemical and immunohistochemical analyses revealed that radiation reduced cerebral amyloid-β levels and microglia activation in female Tg mice, modestly increased microhemorrhages in 50 cGy irradiated male WT mice, and did not affect synaptic marker levels compared to sham controls. Taken together, we show specific short-term changes in neuropathology and behaviour induced by 56Fe irradiation, possibly having implications for long-term space travel.
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Affiliation(s)
- Bin Liu
- Department of Neurology, Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital, Boston, MA, 02115, USA.,Harvard Medical School, Boston, MA, 02115, USA
| | - Robert G Hinshaw
- Department of Neurology, Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital, Boston, MA, 02115, USA.,Harvard Medical School, Boston, MA, 02115, USA.,Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Kevin X Le
- Department of Neurology, Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Mi-Ae Park
- Harvard Medical School, Boston, MA, 02115, USA.,Department of Radiology, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Shuyan Wang
- Department of Radiology, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Anthony P Belanger
- Harvard Medical School, Boston, MA, 02115, USA.,Department of Radiology, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Shipra Dubey
- Harvard Medical School, Boston, MA, 02115, USA.,Department of Radiology, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Jeffrey L Frost
- Department of Neurology, Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Qiaoqiao Shi
- Department of Neurology, Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital, Boston, MA, 02115, USA.,Harvard Medical School, Boston, MA, 02115, USA
| | - Peter Holton
- Harvard Medical School, Boston, MA, 02115, USA.,Department of Radiology, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Lee Trojanczyk
- Department of Neuroscience, University of Rochester Medical Center, Rochester, NY, 14642, USA
| | | | - Paul A Jones
- GE Healthcare, Chalfont St Giles, HP8 4SP, United Kingdom
| | - William Trigg
- GE Healthcare, Chalfont St Giles, HP8 4SP, United Kingdom
| | - Marcelo F Di Carli
- Harvard Medical School, Boston, MA, 02115, USA.,Department of Radiology, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Paul Lorello
- Harvard Medical School Mouse Behavior Core, Boston, MA, 02115, USA
| | | | - Jacqueline P Williams
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA
| | - M Kerry O'Banion
- Department of Neuroscience, University of Rochester Medical Center, Rochester, NY, 14642, USA
| | - Cynthia A Lemere
- Department of Neurology, Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital, Boston, MA, 02115, USA. .,Harvard Medical School, Boston, MA, 02115, USA.
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Electroacupuncture Mitigates Hippocampal Cognitive Impairments by Reducing BACE1 Deposition and Activating PKA in APP/PS1 Double Transgenic Mice. Neural Plast 2019; 2019:2823679. [PMID: 31223308 PMCID: PMC6541940 DOI: 10.1155/2019/2823679] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 03/13/2019] [Accepted: 03/19/2019] [Indexed: 12/24/2022] Open
Abstract
Increased amyloid-β (Aβ) plaque deposition is thought to be the main cause of Alzheimer's disease (AD). β-Site amyloid precursor protein cleaving enzyme 1 (BACE1) is the key protein involved in Aβ peptide generation. Excessive expression of BACE1 might cause overproduction of neurotoxins in the central nervous system. Previous studies indicated that BACE1 initially cleaves the amyloid precursor protein (APP) and may subsequently interfere with physiological functions of proteins such as PKA, which is recognized to be closely associated with long-term potentiation (LTP) level and can effectively ameliorate cognitive impairments. Therefore, revealing the underlying mechanism of BACE1 in the pathogenesis of AD might have a significant impact on the future development of therapeutic agents targeting dementia. This study examined the effects of electroacupuncture (EA) stimulation on BACE1, APP, and p-PKA protein levels in hippocampal tissue samples. Memory and learning abilities were assessed using the Morris water maze test after EA intervention. Immunofluorescence, immunohistochemistry, and western blot were employed to assess the distribution patterns and expression levels of BACE1, APP, and p-PKA, respectively. The results showed the downregulation of BACE1 and APP and the activation of PKA by EA. In summary, EA treatment might reduce BACE1 deposition in APP/PS1 transgenic mice and regulate PKA and its associated substrates, such as LTP to change memory and learning abilities.
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McKenzie-Nickson S, Chan J, Perez K, Hung LW, Cheng L, Sedjahtera A, Gunawan L, Adlard PA, Hayne DJ, McInnes LE, Donnelly PS, Finkelstein DI, Hill AF, Barnham KJ. Modulating Protein Phosphatase 2A Rescues Disease Phenotype in Neurodegenerative Tauopathies. ACS Chem Neurosci 2018; 9:2731-2740. [PMID: 29920069 DOI: 10.1021/acschemneuro.8b00161] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Alzheimer's disease (AD) is the leading cause of dementia worldwide accounting for around 70% of all cases. There is currently no treatment for AD beyond symptom management and attempts at developing disease-modifying therapies have yielded very little. These strategies have traditionally targeted the peptide Aβ, which is thought to drive pathology. However, the lack of clinical translation of these Aβ-centric strategies underscores the need for diverse treatment strategies targeting other aspects of the disease. Metal dyshomeostasis is a common feature of several neurodegenerative diseases such as AD, Parkinson's disease, and frontotemporal dementia, and manipulation of metal homeostasis has been explored as a potential therapeutic avenue for these diseases. The copper ionophore glyoxalbis-[N4-methylthiosemicarbazonato]Cu(II) (CuII(gtsm)) has previously been shown to improve the cognitive deficits seen in an AD animal model; however, the molecular mechanism remained unclear. Here we report that the treatment of two animal tauopathy models (APP/PS1 and rTg4510) with CuII(gtsm) recovers the cognitive deficits seen in both neurodegenerative models. In both models, markers of tau pathology were significantly reduced with CuII(gtsm) treatment, and in the APP/PS1 model, the levels of Aβ remained unchanged. Analysis of tau kinases (GSK3β and CDK5) revealed no drug induced changes; however, both models exhibited a significant increase in the levels of the structural subunit of the tau phosphatase, PP2A. These findings suggest that targeting the tau phosphatase PP2A has therapeutic potential for preventing memory impairments and reducing the tau pathology seen in AD and other tauopathies.
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Affiliation(s)
- Simon McKenzie-Nickson
- Florey Institute of Neuroscience and Mental Health, Parkville, Melbourne, Victoria 3052, Australia
| | - Jacky Chan
- Florey Institute of Neuroscience and Mental Health, Parkville, Melbourne, Victoria 3052, Australia
| | - Keyla Perez
- Florey Institute of Neuroscience and Mental Health, Parkville, Melbourne, Victoria 3052, Australia
| | - Lin W. Hung
- Florey Institute of Neuroscience and Mental Health, Parkville, Melbourne, Victoria 3052, Australia
| | - Lesley Cheng
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Amelia Sedjahtera
- Florey Institute of Neuroscience and Mental Health, Parkville, Melbourne, Victoria 3052, Australia
| | - Lydia Gunawan
- Florey Institute of Neuroscience and Mental Health, Parkville, Melbourne, Victoria 3052, Australia
| | - Paul A. Adlard
- Florey Institute of Neuroscience and Mental Health, Parkville, Melbourne, Victoria 3052, Australia
| | | | | | | | - David I. Finkelstein
- Florey Institute of Neuroscience and Mental Health, Parkville, Melbourne, Victoria 3052, Australia
| | - Andrew F. Hill
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Kevin J. Barnham
- Florey Institute of Neuroscience and Mental Health, Parkville, Melbourne, Victoria 3052, Australia
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24
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Panagaki T, Gengler S, Hölscher C. The Novel DA–CH3 Dual Incretin Restores Endoplasmic Reticulum Stress and Autophagy Impairments to Attenuate Alzheimer-Like Pathology and Cognitive Decrements in the APPSWE/PS1ΔE9 Mouse Model. J Alzheimers Dis 2018; 66:195-218. [DOI: 10.3233/jad-180584] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Theodora Panagaki
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University, Lancaster, UK
| | - Simon Gengler
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University, Lancaster, UK
| | - Christian Hölscher
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University, Lancaster, UK
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25
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Jiang L, Ma J, Zhang Y, Zhou CN, Zhang L, Chao FL, Chen LM, Jiang R, Wu H, Tang Y. Effect of running exercise on the number of the neurons in the hippocampus of young transgenic APP/PS1 mice. Brain Res 2018; 1692:56-65. [DOI: 10.1016/j.brainres.2018.04.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 04/08/2018] [Accepted: 04/25/2018] [Indexed: 12/31/2022]
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26
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Ligustilide Ameliorates Memory Deficiency in APP/PS1 Transgenic Mice via Restoring Mitochondrial Dysfunction. BIOMED RESEARCH INTERNATIONAL 2018; 2018:4606752. [PMID: 30079347 PMCID: PMC6069587 DOI: 10.1155/2018/4606752] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 05/30/2018] [Accepted: 06/10/2018] [Indexed: 12/20/2022]
Abstract
Ligustilide, the main lipophilic component of Radix angelicae sinensis, has been shown to ameliorate cognitive dysfunction in a few Alzheimer's disease mouse models, but its mechanism is not fully understood. In this study, we employed 7-month-old APP/PS1 mice to explore whether LIG is able to protect against Alzheimer's disease progression. The Morris water maze and Y-maze test results showed that eight weeks of intragastric administration of LIG (10 mg/kg, 40 mg/kg) every day improved memory deficit in APP/PS1 mice. The thioflavin-S staining and Western blot results (Aβ1-42 monomer/oligomer, APP, ADAM10, SAPPα, and PreP) showed that LIG reduced Aβ levels in the brain of APP/PS1 mice. Transmission electron microscopy analysis showed that LIG reduced the mitochondria number and increased the mitochondrial length in the hippocampal CA1 area of APP/PS1 mice. A reduced level of Drp1 (fission) and increased levels of Mfn1, Mfn2, and Opa1 (fusion) were found in APP/PS1 mice treated with LIG. An increased ATP level in the brain and increased activities of cytochrome c oxidase (CCO) and succinate dehydrogenase (SDH) in mitochondrion separated from the hippocampus and cortex revealed that LIG alleviated mitochondrial dysfunction. LIG exerts an antioxidation effect via reducing the levels of malondialdehyde (MDA) and reactive oxygen species (ROS) and increasing the activity of Mn-SOD in the brain. Elevated levels of PSD-95, synaptophysin, and synapsin 1 in both the hippocampus and cortex indicated that LIG provided synaptic protection. These findings show that treatment with LIG ameliorates mitochondrial dynamics and morphology issues, improves mitochondrial function, reduces Aβ levels in the brain, restores the synaptic structure, and ameliorates memory deficit in APP/PS1 mice. These results imply that LIG may serve as a potential antidementia drug.
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27
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Siucinska E, Brutkowski W, Bernas T. CB1 Cannabinoid Receptor Expression in the Barrel Field Region Is Associated with Mouse Learning. ACS Chem Neurosci 2018. [PMID: 29537813 DOI: 10.1021/acschemneuro.7b00500] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
We found previously that fear conditioning by combined stimulation of a row B facial vibrissae (conditioned stimulus, CS) with a tail shock (unconditioned stimulus, UCS) leads to expansion of the cortical representation of the "trained" row, labeled with 2-deoxyglucose (2DG), in the layer IIIb/IV of the adult mouse the primary somatosensory cortex (S1) 24 h later. We have observed that these learning-dependent plastic changes are manifested by increased expression of somatostatin, cholecystokinin (SST+, CCK+) but not parvalbumin (PV+) immunopositive interneurons We have expanded this research and quantified a numerical value of CB1-expressing and PV-expressing GABAergic axon terminals (CB1+ and PV+ immunopositive puncta) that innervate different segments of postsynaptic cells in the barrel hollows of S1 cortex. We used 3D microscopy to identify the CB+ and PV+ puncta in the barrel cortex "trained" and the control hemispheres CS+UCS group and in controls: Pseudoconditioned, CS-only, UCS-only, and naive animals. We have identified that (i) the association between whisker-shock "trained" barrel B hollows and CB1+, but not PV+ puncta expression remained significant after Bonferroni correction, (ii) CS+UCS has had a significant increasing effect on expression of CB1+ but not PV+ puncta in barrel cortex "trained" hemisphere, and (iii) the pseudoconditioning had a significant decreasing effect on expression of CB1+, but not on PV+ puncta in barrel cortex, both trained and untrained hemispheres. It is correlated to disturbing behaviors. The results suggest that CB1+ puncta regulation is specifically linked with mechanisms leading to learning-dependent plasticity in S1 cortex.
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Affiliation(s)
- Ewa Siucinska
- Laboratory of Neuroplasticity, Department of Molecular and Cellular Neurobiology, Nencki Institute of Experimental Biology of Polish Academy of Sciences, 3 Pasteur Str., 02-093 Warsaw, Poland
| | - Wojciech Brutkowski
- Laboratory of Imaging Tissue Structure and Function Neurobiology Center, Nencki Institute of Experimental Biology of Polish Academy of Sciences, 3 Pasteur Str., 02-093 Warsaw, Poland
| | - Tytus Bernas
- Laboratory of Imaging Tissue Structure and Function Neurobiology Center, Nencki Institute of Experimental Biology of Polish Academy of Sciences, 3 Pasteur Str., 02-093 Warsaw, Poland
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28
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O'Leary TP, Hussin AT, Gunn RK, Brown RE. Locomotor activity, emotionality, sensori-motor gating, learning and memory in the APPswe/PS1dE9 mouse model of Alzheimer's disease. Brain Res Bull 2018; 140:347-354. [PMID: 29870778 DOI: 10.1016/j.brainresbull.2018.05.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2017] [Revised: 05/11/2018] [Accepted: 05/31/2018] [Indexed: 02/06/2023]
Abstract
The APPswe/PS1dE9 mouse (line 85) is a double transgenic model of Alzheimer's disease (AD) with familial amyloid precursor protein and presenilin-1 mutations. These mice develop age-related behavioral changes reflective of the neuropsychiatric symptoms (altered anxiety-like behaviour, hyperactivity) and cognitive dysfunction (impaired learning and memory) observed in AD. The APPswe/PS1dE9 mouse has been used to examine the efficacy of therapeutic interventions on behaviour, despite previous difficulties in replicating behavioural phenotypes. Therefore, the purpose of this study was to establish the reliability of these phenotypes by further characterizing the behaviour of male APPswe/PS1dE9 and wild-type mice between 7 and 14 months of age. Mice were tested on the open-field over 5-days to examine emotionality, locomotor activity and inter-session habituation. Mice were also tested on the repeated-reversal water maze task and spontaneous alternation on the Y-maze to assess working memory. Sensori-motor gating was examined with acoustic startle and pre-pulse inhibition. Lastly contextual and cued (trace) memory was assessed with fear conditioning. The results show that among non-cognitive behaviours, APPswe/PS1dE9 mice have normal locomotor activity, anxiety-like behavior, habituation and sensori-motor gating. However, APPswe/PS1dE9 mice show impaired working memory on the repeated-reversal water-maze and impaired memory in contextual but not trace-cued fear conditioning. These results indicate that the APPswe/PS1dE9 (line 85) mice have deficits in some types of hippocampal-dependent learning and memory and, at the ages tested, APPswe/PS1dE9 mice model cognitive dysfunction but not neuropsychiatric symptoms.
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Affiliation(s)
- Timothy P O'Leary
- Department of Psychology and Neuroscience, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada
| | - Ahmed T Hussin
- Department of Psychology and Neuroscience, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada
| | - Rhian K Gunn
- Department of Psychology and Neuroscience, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada
| | - Richard E Brown
- Department of Psychology and Neuroscience, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada.
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29
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Flanigan TJ, Anderson JE, Elayan I, Allen AR, Ferguson SA. Effects of Cyclophosphamide and/or Doxorubicin in a Murine Model of Postchemotherapy Cognitive Impairment. Toxicol Sci 2018; 162:462-474. [PMID: 29228376 PMCID: PMC6659022 DOI: 10.1093/toxsci/kfx267] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Postchemotherapy cognitive impairment, or PCCI, is a common complaint, particularly among breast cancer patients. However, the exact nature of PCCI appears complex. To model the human condition, ovariectomized C57BL/6J mice were treated intravenous weekly for 4 weeks with saline, 2 mg/kg doxorubicin (DOX), 50 mg/kg cyclophosphamide (CYP), or DOX + CYP. For the subsequent 10 weeks, mice were assessed on several behavioral tests, including those measuring spatial learning and memory. After sacrifice, hippocampal spine density and morphology in the dentate gyrus, CA1, and CA3 regions were measured. Additionally, hippocampal levels of total glutathione, glutathione disulfide, MnSOD, CuZnSOD, and cytokines were measured. Body weight decreased in all groups during treatment, but recovered post-treatment. Most behaviors were unaffected by drug treatment: Open field activity, motor coordination, grip strength, water maze and Barnes maze performance, buried food test performance, and novel object and object location recognition tests. There were some significant effects of CYP and DOX + CYP treatment during the initial test of home cage behavior, but these did not persist into the second and third test times. Density of stubby spines, but not mushroom or thin spines, in the dentate gyrus was significantly decreased in the DOX, CYP, and DOX + CYP treatment groups. There were no significant effects in the CA1 or CA3 regions. CuZnSOD levels were significantly increased in DOX + CYP-treated mice; other hippocampal antioxidant levels were unaffected. Most cytokines showed no treatment-related effects, but IL-1β, IL-6, and IL-12 were slightly reduced in mice treated with DOX + CYP. Although the animal model, route of exposure, and DOX and CYP doses used here were reflective of human exposure, there were only sporadic effects due to chemotherapeutic treatment.
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Affiliation(s)
- Timothy J Flanigan
- Division of Neurotoxicology, National Center for Toxicological Research/FDA, Jefferson, Arkansas 72079
| | - Julie E Anderson
- Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205
| | - Ikram Elayan
- Division of Psychiatry Products, Center for Drug Evaluation and Research/FDA, Silver Spring, Maryland 20993
| | - Antiño R Allen
- Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205
| | - Sherry A Ferguson
- Division of Neurotoxicology, National Center for Toxicological Research/FDA, Jefferson, Arkansas 72079
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30
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Liu W, Zhuo P, Li L, Jin H, Lin B, Zhang Y, Liang S, Wu J, Huang J, Wang Z, Lin R, Chen L, Tao J. Activation of brain glucose metabolism ameliorating cognitive impairment in APP/PS1 transgenic mice by electroacupuncture. Free Radic Biol Med 2017; 112:174-190. [PMID: 28756309 DOI: 10.1016/j.freeradbiomed.2017.07.024] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2016] [Revised: 07/24/2017] [Accepted: 07/25/2017] [Indexed: 02/06/2023]
Abstract
An essential feature of Alzheimer's disease (AD) is implicated in brain energy metabolic impairment that is considered underlying pathogenesis of cognitive impairment. Therefore, therapeutic interventions to allay cognitive deficits that target energy metabolism may be an efficacy strategy in AD. In this study, we found that electroacupuncture (EA) at the DU20 acupoint obviously increased glucose metabolism in specific brain regions such as cortex, hippocampus, cingulate gyrus, basal forebrain septum, brain stem, and cerebellum in APP/PS1 transgenic mice by animal 18F-Fluoro-2-deoxy-D-Glucose (18F-FDG)/positron emission tomography (PET) imaging, accompanied by cognitive improvements in the spatial reference learning and memory and memory flexibility and novel object recognition performances. Further evidence shown energy metabolism occurred in neurons or non-neuronal cells of the cortex and hippocampus in terms of the co-location of GLUT3/NeuN and GLUT1/GFAP. Simultaneously, metabolic homeostatic factors were critical for glucose metabolism, including phosphorylated adenosine monophosphate-activated protein kinase (AMPK) and AKT serine/threonine kinase. Furthermore, EA-induced phosphorylated AMPK and AKT inhibited the phosphorylation level of the mammalian target of rapamycin (mTOR) to decrease the accumulation of amyloid-beta (Aβ) in the cortex and hippocampus. These findings are concluded that EA is a potential therapeutic target for delaying memory decline and Aβ deposition of AD. The AMPK and AKT are implicated in the EA-induced cortical and hippocampal energy metabolism, which served as a contributor to improving cognitive function and Aβ deposition in a transgenic mouse model of AD.
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Affiliation(s)
- Weilin Liu
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, China
| | - Peiyuan Zhuo
- Fujian Key Laboratory of Rehabilitation Technology, Fuzhou, Fujian 350122, China
| | - Long Li
- Fujian Key Laboratory of Rehabilitation Technology, Fuzhou, Fujian 350122, China
| | - Hao Jin
- Fujian Key Laboratory of Rehabilitation Technology, Fuzhou, Fujian 350122, China
| | - Bingbing Lin
- Fujian Key Laboratory of Rehabilitation Technology, Fuzhou, Fujian 350122, China
| | - Yingzheng Zhang
- Fujian Key Laboratory of Rehabilitation Technology, Fuzhou, Fujian 350122, China
| | - Shengxiang Liang
- Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Jie Wu
- Fujian Key Laboratory of Rehabilitation Technology, Fuzhou, Fujian 350122, China
| | - Jia Huang
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, China
| | - Zhifu Wang
- Fujian Key Laboratory of Rehabilitation Technology, Fuzhou, Fujian 350122, China
| | - Ruhui Lin
- Fujian Key Laboratory of Rehabilitation Technology, Fuzhou, Fujian 350122, China
| | - Lidian Chen
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, China.
| | - Jing Tao
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, China.
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31
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Kelly P, Denver P, Satchell SC, Ackermann M, Konerding MA, Mitchell CA. Microvascular ultrastructural changes precede cognitive impairment in the murine APPswe/PS1dE9 model of Alzheimer's disease. Angiogenesis 2017; 20:567-580. [PMID: 28741167 PMCID: PMC5660145 DOI: 10.1007/s10456-017-9568-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 07/18/2017] [Indexed: 01/04/2023]
Abstract
Cerebral and systemic organ microvascular pathologies coexist with human Alzheimer's disease (AD) neuropathology. In this study, we hypothesised that both cerebral and systemic microvascular pathologies exist in 4- to 5-month-old male APPswe/PS1dE9 (APP/PS1) transgenic mice prior to the onset of cognitive impairment. To assess this we examined recognition memory in both wild-type and APP/PS1 mice using the object recognition task (ORT; n = 11 per group) and counted thioflavin-S-positive plaques in brain (n = 6 per group). Vascular casts of brain, liver, spleen and kidneys were examined using scanning electron microscopy (n = 6 per group), and the urinary albumin-to-creatinine ratio (uACR; n = 5 per group) was measured as an index of glomerular permeability. Murine recognition memory was intact, as demonstrated by a significant preference for the novel object in the ORT paradigm. Brain sections of wild-type mice were devoid of thioflavin-S positivity, whereas age-matched APP/PS1 mice had an average of 0.88 ± 0.22 thioflavin-S-positive plaques in the cortex, 0.42 ± 0.17 plaques in the dentate gyrus and 0.30 ± 0.07 plaques in the cornus ammonis 1 region. The profiles of casted cerebral capillaries of wild-type mice were smooth and regular in contrast to those of APP/PS1 mice which demonstrate characteristic (0.5-4.6 μm) 'tags'. APP/PS1 mice also had a significantly reduced hepatic vessel number (p = 0.0002) and an increase in the number of splenic microvascular pillars (p = 0.0231), in the absence of changes in either splenic microvascular density (p = 0.3746) or glomerular ultrastructure. The highly significant reduction in uACR in APP/PS1 mice compared to wild-type (p = 0.0079) is consistent with glomerular microvascular dysfunction. These findings highlight early microvascular pathologies in 4- to 5-month-old APP/PS1 transgenic mice and may indicate an amenable target for pharmacological intervention in AD.
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Affiliation(s)
- Patricia Kelly
- School of Biomedical Sciences, University of Ulster, Coleraine, Northern Ireland, UK
| | - Paul Denver
- School of Biomedical Sciences, University of Ulster, Coleraine, Northern Ireland, UK
| | | | - Maximilian Ackermann
- Institute of Functional and Clinical Anatomy, University Medical Centre, Johannes Gutenberg-University Mainz, Mainz, Germany
| | - Moritz A Konerding
- Institute of Functional and Clinical Anatomy, University Medical Centre, Johannes Gutenberg-University Mainz, Mainz, Germany
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Behavioural Phenotyping of APPswe/PS1δE9 Mice: Age-Rrelated Changes and Effect of Long-Term Paroxetine Treatment. PLoS One 2016; 11:e0165144. [PMID: 27814403 PMCID: PMC5096719 DOI: 10.1371/journal.pone.0165144] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 10/09/2016] [Indexed: 12/20/2022] Open
Abstract
Alzheimer’s disease (AD) is a devastating illness characterized by a progressive loss of cognitive, social, and emotional functions, including memory impairments and more global cognitive deficits. Clinical-epidemiological evidence suggests that neuropsychiatric symptoms precede the onset of cognitive symptoms both in humans with early and late onset AD. The behavioural profile promoted by the AD pathology is believed to associate with degeneration of the serotonergic system. Using the APPswe/PS1δE9 model of AD-like pathology starting with 9 months old mice, we characterised long term non-cognitive behavioural changes measured at 9, 12, 15, and 18 months of age and applied principal component analysis on data obtained from open field, elevated plus maze, and social interaction tests. Long-term treatment with the selective serotonin reuptake inhibitor (SSRI) paroxetine was applied to assess the role of 5-HT on the behavioural profile; duration of treatment was 9 months, initiated when mice were 9 months of age. Treatment with paroxetine delays the decline in locomotion, in exploration and risk assessment behaviour, found in the APP/PS1 mice. APP/PS1 mice also exhibit low social activity and less aggressiveness, both of which are not affected by treatment with paroxetine. The APP/PS1 behavioural phenotype, demonstrated in this study, only begins to manifest itself from 12 months of age. Our results indicate that treatment with SSRI might ameliorate some of the behavioural deficits found in aged APP/PS1 mice.
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Maternal separation exacerbates Alzheimer's disease-like behavioral and pathological changes in adult APPswe/PS1dE9 mice. Behav Brain Res 2016; 318:18-23. [PMID: 27771383 DOI: 10.1016/j.bbr.2016.10.030] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Revised: 10/17/2016] [Accepted: 10/19/2016] [Indexed: 11/20/2022]
Abstract
Alzheimer's disease (AD), the most common neurodegenerative disorder that gradually destroys memory and cognitive abilities in the elderly, makes a huge emotional and economic burden on the patients and their families. The presence of senile plaques and the loss of cholinergic neurons in the brain are two neuropathological hallmarks of AD. Maternal separation (MS) is an animal paradigm designed to make early life stress. Studies on wild type rodents showed that MS could induce AD-like cognitive deficit and pathological changes. However, the effects of MS on AD susceptible population or AD animal models are still unclear. In the present study, male APPswe/PS1dE9 transgenic mice were separated from dam and pups 3h per day from postnatal day 2 to day 21. After weaning, all animals were housed under normal conditions (4 mice per cage). At 9-month age, MWM tests were performed to evaluate the learning and memory abilities. Then the pathological changes in the brain were measured by histology staining. The results showed MS mice had more severe deficit of learning and memory. Compared to the control, there were more senile plaques in cortex and hippocampus, fewer cholinergic neurons in nucleus basalis of Meynert in MS mice. These results indicate that MS exacerbates Alzheimer's disease-like behavioral and pathological changes in APPswe/PS1dE9 mice.
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Mao Y, Guo Z, Zheng T, Jiang Y, Yan Y, Yin X, Chen Y, Zhang B. Intranasal insulin alleviates cognitive deficits and amyloid pathology in young adult APPswe/PS1dE9 mice. Aging Cell 2016; 15:893-902. [PMID: 27457264 PMCID: PMC5013027 DOI: 10.1111/acel.12498] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/23/2016] [Indexed: 11/26/2022] Open
Abstract
Brain insulin signaling deficits contribute to multiple pathological features of Alzheimer's disease (AD). Although intranasal insulin has shown efficacy in patients with AD, the underlying mechanisms remain largely unillustrated. Here, we demonstrate that intranasal insulin improves cognitive deficits, ameliorates defective brain insulin signaling, and strongly reduces β‐amyloid (Aβ) production and plaque formation after 6 weeks of treatment in 4.5‐month‐old APPswe/PS1dE9 (APP/PS1) mice. Furthermore, c‐Jun N‐terminal kinase activation, which plays a pivotal role in insulin resistance and AD pathologies, is significantly inhibited. The alleviation of amyloid pathology by intranasal insulin results mainly from enhanced nonamyloidogenic processing and compromised amyloidogenic processing of amyloid precursor protein (APP), and from a reduction in apolipoprotein E protein which is involved in Aβ metabolism. In addition, intranasal insulin effectively promotes hippocampal neurogenesis in APP/PS1 mice. This study, exploring the mechanisms underlying the beneficial effects of intranasal insulin on Aβ pathologies in vivo for the first time, highlights important preclinical evidence that intranasal insulin is potentially an effective therapeutic method for the prevention and treatment of AD.
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Affiliation(s)
- Yan‐Fang Mao
- Department of Neurology the Second Affiliated Hospital College of Medicine Zhejiang University Hangzhou Zhejiang China
| | - Zhangyu Guo
- Department of Neurology the Second Affiliated Hospital College of Medicine Zhejiang University Hangzhou Zhejiang China
| | - Tingting Zheng
- Department of Neurology the Second Affiliated Hospital College of Medicine Zhejiang University Hangzhou Zhejiang China
| | - Yasi Jiang
- Department of Neurology the Second Affiliated Hospital College of Medicine Zhejiang University Hangzhou Zhejiang China
| | - Yaping Yan
- Department of Neurology the Second Affiliated Hospital College of Medicine Zhejiang University Hangzhou Zhejiang China
| | - Xinzhen Yin
- Department of Neurology the Second Affiliated Hospital College of Medicine Zhejiang University Hangzhou Zhejiang China
| | - Yanxing Chen
- Department of Neurology the Second Affiliated Hospital College of Medicine Zhejiang University Hangzhou Zhejiang China
| | - Baorong Zhang
- Department of Neurology the Second Affiliated Hospital College of Medicine Zhejiang University Hangzhou Zhejiang China
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Dietary composition affects the development of cognitive deficits in WT and Tg AD model mice. Exp Gerontol 2016; 86:39-49. [PMID: 27167583 DOI: 10.1016/j.exger.2016.05.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 04/22/2016] [Accepted: 05/06/2016] [Indexed: 01/17/2023]
Abstract
Clinical and epidemiological evidence suggests that lifestyle factors, including nutrition, may influence the chances of developing of Alzheimer's disease (AD), and also likely affect the aging process. Whereas it is clear that high-fat diets are increasing both body weight and the risk of developing Alzheimer's disease, to date, there have been very few studies comparing diets high with different sources of calories (i.e., high fat versus high protein versus high carbohydrates) to determine whether dietary composition has importance beyond the known effect of high caloric intake to increase body weight, AD pathology and cognitive deficits. In the current study we examined the effects that different diets high in carbohydrate, protein or fat content, but similar in caloric value, have on the development of cognitive impairment and brain pathology in wild-type and Tg AD model mice. The results demonstrate that long term feeding with balanced diets similar in caloric content but with significant changes in the source of calories, all negatively influence cognition compared to the control diet, and that this effect is more pronounced in Tg animals with AD pathology.
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The Transient Receptor Potential Melastatin 2 (TRPM2) Channel Contributes to β-Amyloid Oligomer-Related Neurotoxicity and Memory Impairment. J Neurosci 2016; 35:15157-69. [PMID: 26558786 DOI: 10.1523/jneurosci.4081-14.2015] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
UNLABELLED In Alzheimer's disease, accumulation of soluble oligomers of β-amyloid peptide is known to be highly toxic, causing disturbances in synaptic activity and neuronal death. Multiple studies relate these effects to increased oxidative stress and aberrant activity of calcium-permeable cation channels leading to calcium imbalance. The transient receptor potential melastatin 2 (TRPM2) channel, a Ca(2+)-permeable nonselective cation channel activated by oxidative stress, has been implicated in neurodegenerative diseases, and more recently in amyloid-induced toxicity. Here we show that the function of TRPM2 is augmented by treatment of cultured neurons with β-amyloid oligomers. Aged APP/PS1 Alzheimer's mouse model showed increased levels of endoplasmic reticulum stress markers, protein disulfide isomerase and phosphorylated eukaryotic initiation factor 2α, as well as decreased levels of the presynaptic marker synaptophysin. Elimination of TRPM2 in APP/PS1 mice corrected these abnormal responses without affecting plaque burden. These effects of TRPM2 seem to be selective for β-amyloid toxicity, as ER stress responses to thapsigargin or tunicamycin in TRPM2(-/-) neurons was identical to that of wild-type neurons. Moreover, reduced microglial activation was observed in TRPM2(-/-)/APP/PS1 hippocampus compared with APP/PS1 mice. In addition, age-dependent spatial memory deficits in APP/PS1 mice were reversed in TRPM2(-/-)/APP/PS1 mice. These results reveal the importance of TRPM2 for β-amyloid neuronal toxicity, suggesting that TRPM2 activity could be potentially targeted to improve outcomes in Alzheimer's disease. SIGNIFICANCE STATEMENT Transient receptor potential melastatin 2 (TRPM2) is an oxidative stress sensing calcium-permeable channel that is thought to contribute to calcium dysregulation associated with neurodegenerative diseases, including Alzheimer's disease. Here we show that oligomeric β-amyloid, the toxic peptide in Alzheimer's disease, facilitates TRPM2 channel activation. In mice designed to model Alzheimer's disease, genetic elimination of TRPM2 normalized deficits in synaptic markers in aged mice. Moreover, the absence of TRPM2 improved age-dependent spatial memory deficits observed in Alzheimer's mice. Our results reveal the importance of TRPM2 for neuronal toxicity and memory impairments in an Alzheimer's mouse model and suggest that TRPM2 could be targeted for the development of therapeutic agents effective in the treatment of dementia.
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Chronic MPTP treatment produces hyperactivity in male mice which is not alleviated by concurrent trehalose treatment. Behav Brain Res 2015; 292:68-78. [DOI: 10.1016/j.bbr.2015.05.057] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Accepted: 05/23/2015] [Indexed: 11/19/2022]
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A comparative evaluation of a novel vaccine in APP/PS1 mouse models of Alzheimer's disease. BIOMED RESEARCH INTERNATIONAL 2015; 2015:807146. [PMID: 25759822 PMCID: PMC4339718 DOI: 10.1155/2015/807146] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Accepted: 09/14/2014] [Indexed: 12/13/2022]
Abstract
Immunization against amyloid-beta-peptide (Aβ) has been widely investigated as a potential immunotherapeutic approach for Alzheimer's disease (AD). With the aim of developing an active immunogenic vaccine without need of coadjuvant modification for human trials and therefore avoiding such side effects, we designed the Aβ1–42 vaccine (EB101), delivered in a liposomal matrix, that based on our previous studies significantly prevents and reverses the AD neuropathology, clearing Aβ plaques while markedly reducing neuronal degeneration, behavioral deficits, and minimizing neuroinflammation in APP/PS1 transgenic mice. Here, the efficacy of our immunogenic vaccine EB101 was compared with the original immunization vaccine cocktail Aβ42 + CFA/IFA (Freund's adjuvant), in order to characterize the effect of sphingosine-1-phosphate (S1P) in the immunotherapeutic response. Quantitative analysis of amyloid burden showed a notable decrease in the neuroinflammation reaction against Aβ plaques when S1P was compared with other treatments, suggesting that S1P plays a key role as a neuroprotective agent. Moreover, EB101 immunized mice presented a protective immunogenic reaction resulting in the increase of Aβ-specific antibody response and decrease of reactive glia in the affected brain areas, leading to a Th2 immunological reaction.
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Lysenko LV, Kim J, Henry C, Tyrtyshnaia A, Kohnz RA, Madamba F, Simon GM, Kleschevnikova NE, Nomura DK, Ezekowitz R.AB, Kleschevnikov AM. Monoacylglycerol lipase inhibitor JZL184 improves behavior and neural properties in Ts65Dn mice, a model of down syndrome. PLoS One 2014; 9:e114521. [PMID: 25474204 PMCID: PMC4256450 DOI: 10.1371/journal.pone.0114521] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 11/10/2014] [Indexed: 12/13/2022] Open
Abstract
Genetic alterations or pharmacological treatments affecting endocannabinoid signaling have profound effects on synaptic and neuronal properties and, under certain conditions, may improve higher brain functions. Down syndrome (DS), a developmental disorder caused by triplication of chromosome 21, is characterized by deficient cognition and inevitable development of the Alzheimer disease (AD) type pathology during aging. Here we used JZL184, a selective inhibitor of monoacylglycerol lipase (MAGL), to examine the effects of chronic MAGL inhibition on the behavioral, biochemical, and synaptic properties of aged Ts65Dn mice, a genetic model of DS. In both Ts65Dn mice and their normosomic (2N) controls, JZL184-treatment increased brain levels of 2-arachidonoylglycerol (2-AG) and decreased levels of its metabolites such as arachidonic acid, prostaglandins PGD2, PGE2, PGFα, and PGJ2. Enhanced spontaneous locomotor activity of Ts65Dn mice was reduced by the JZL184-treatement to the levels observed in 2N animals. Deficient long-term memory was also improved, while short-term and working types of memory were unaffected. Furthermore, reduced hippocampal long-term potentiation (LTP) was increased in the JZL184-treated Ts65Dn mice to the levels observed in 2N mice. Interestingly, changes in synaptic plasticity and behavior were not observed in the JZL184-treated 2N mice suggesting that the treatment specifically attenuated the defects in the trisomic animals. The JZL184-treatment also reduced the levels of Aβ40 and Aβ42, but had no effect on the levels of full length APP and BACE1 in both Ts65Dn and 2N mice. These data show that chronic MAGL inhibition improves the behavior and brain functions in a DS model suggesting that pharmacological targeting of MAGL may be considered as a perspective new approach for improving cognition in DS.
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Affiliation(s)
- Larisa V. Lysenko
- Department of Neurosciences, University of California San Diego, La Jolla, CA, United States of America
| | - Jeesun Kim
- Department of Neurosciences, University of California San Diego, La Jolla, CA, United States of America
| | - Cassandra Henry
- Abide Therapeutics, Inc., San Diego, CA, United States of America
| | - Anna Tyrtyshnaia
- School of Biomedicine, Far Eastern Federal University, Sukhanova 8, Vladivostok, Russian Federation
| | - Rebecca A. Kohnz
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, California, United States of America
| | - Francisco Madamba
- Department of Neurosciences, University of California San Diego, La Jolla, CA, United States of America
| | - Gabriel M. Simon
- Abide Therapeutics, Inc., San Diego, CA, United States of America
| | - Natalia E. Kleschevnikova
- Department of Neurosciences, University of California San Diego, La Jolla, CA, United States of America
| | - Daniel K. Nomura
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, California, United States of America
| | | | - Alexander M. Kleschevnikov
- Department of Neurosciences, University of California San Diego, La Jolla, CA, United States of America
- * E-mail:
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Bilkei-Gorzo A. Genetic mouse models of brain ageing and Alzheimer's disease. Pharmacol Ther 2014; 142:244-57. [DOI: 10.1016/j.pharmthera.2013.12.009] [Citation(s) in RCA: 131] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Accepted: 11/26/2013] [Indexed: 12/21/2022]
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Lok K, Zhao H, Zhang C, He N, Shen H, Wang Z, Zhao W, Yin M. Effects of accelerated senescence on learning and memory, locomotion and anxiety-like behavior in APP/PS1 mouse model of Alzheimer's disease. J Neurol Sci 2013; 335:145-54. [DOI: 10.1016/j.jns.2013.09.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Revised: 09/12/2013] [Accepted: 09/13/2013] [Indexed: 10/26/2022]
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