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Smith PJ, Mabe S, Sherwood A, Babyak MA, Murali Doraiswamy P, Welsh-Bohmer KA, Kraus W, Burke J, Hinderliter A, Blumenthal JA. Association Between Insulin Resistance, Plasma Leptin, and Neurocognition in Vascular Cognitive Impairment. J Alzheimers Dis 2019; 71:921-929. [PMID: 31476159 PMCID: PMC10840083 DOI: 10.3233/jad-190569] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
BACKGROUND Greater body weight has been associated impairments in neurocognition and greater dementia risk, although the mechanisms linking weight and neurocognition have yet to be adequately delineated. OBJECTIVE To examine metabolic mechanisms underlying the association between obesity and neurocognition. METHODS We conducted a secondary analysis of weight, neurocognition, and the potentially mediating role of metabolic and inflammatory biomarkers among 160 participants from the ENLIGHTEN trial of vascular cognitive impairment, no dementia (CIND). Neurocognition was assessed using a 45-minute assessment battery assessing Executive Function, Verbal and Visual Memory. We considered three metabolic biomarkers: insulin resistance (homeostatic model assessment [HOMA-IR]), plasma leptin, and insulin-like growth factor (IGF-1). Inflammation was assessed using C-reactive protein. Multiple regression analyses were used. RESULTS Participants included 160 sedentary older adults with CIND. Participants tended to be overweight or obese (mean BMI = 32.5 [SD = 4.8]). Women exhibited higher BMI (p = 0.043), CRP (p < 0.001), and leptin (p < 0.001) compared with men. Higher BMI levels were associated with worse performance on measures of Executive Function (β= -0.16, p = 0.024) and Verbal Memory (β= -0.16, p = 0.030), but not Visual Memory (β= 0.05, p = 0.500). Worse metabolic biomarker profiles also were associated with lower Executive Function (β= -0.12, p = 0.050). Mediation analyses suggested leptin was a plausible candidate as a mediator between BMI and Executive Function. CONCLUSIONS In overweight and obese adults with vascular CIND, the association between greater weight and poorer executive function may be mediated by higher leptin resistance.
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Affiliation(s)
- Patrick J. Smith
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
| | - Stephanie Mabe
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
| | - Andrew Sherwood
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
| | - Michael A. Babyak
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
| | - P. Murali Doraiswamy
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
| | - Kathleen A. Welsh-Bohmer
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
| | - William Kraus
- Department of Medicine, Duke University Medical Center, Durham, NC, USA
| | - James Burke
- Department of Neurology, Duke University Medical Center, Durham, NC, USA
| | - Alan Hinderliter
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - James A. Blumenthal
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
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152
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Roberts SB, Das SK, Suen VMM, Pihlajamäki J, Kuriyan R, Steiner-Asiedu M, Taetzsch A, Anderson AK, Silver RE, Barger K, Krauss A, Karhunen L, Zhang X, Hambly C, Schwab U, Triffoni-Melo ADT, Taylor SF, Economos C, Kurpad AV, Speakman JR. Measured energy content of frequently purchased restaurant meals: multi-country cross sectional study. BMJ 2018; 363:k4864. [PMID: 30541752 PMCID: PMC6290458 DOI: 10.1136/bmj.k4864] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
OBJECTIVE To measure the energy content of frequently ordered meals from full service and fast food restaurants in five countries and compare values with US data. DESIGN Cross sectional survey. SETTING 223 meals from 111 randomly selected full service and fast food restaurants serving popular cuisines in Brazil, China, Finland, Ghana, and India were the primary sampling unit; 10 meals from five worksite canteens were also studied in Finland. The observational unit was frequently ordered meals in selected restaurants. MAIN OUTCOME MEASURE Meal energy content, measured by bomb calorimetry. RESULTS Compared with the US, weighted mean energy of restaurant meals was lower only in China (719 (95% confidence interval 646 to 799) kcal versus 1088 (1002 to 1181) kcal; P<0.001). In analysis of variance models, fast food contained 33% less energy than full service meals (P<0.001). In Finland, worksite canteens provided 25% less energy than full service and fast food restaurants (mean 880 (SD 156) versus 1166 (298); P=0.009). Country, restaurant type, number of meal components, and meal weight predicted meal energy in a factorial analysis of variance (R2=0.62, P<0.001). Ninety four per cent of full service meals and 72% of fast food meals contained at least 600 kcal. Modeling indicated that, except in China, consuming current servings of a full service and a fast food meal daily would supply between 70% and 120% of the daily energy requirements for a sedentary woman, without additional meals, drinks, snacks, appetizers, or desserts. CONCLUSION Very high dietary energy content of both full service and fast food restaurant meals is a widespread phenomenon that is probably supporting global obesity and provides a valid intervention target.
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Affiliation(s)
- Susan B Roberts
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, USA
| | - Sai Krupa Das
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, USA
| | | | - Jussi Pihlajamäki
- Institute of Public Health and Clinical Nutrition, School of Medicine, University of Eastern Finland, Kuopio, 70211, Finland
- Clinical Nutrition and Obesity Center, Kuopio University Hospital, Kuopio, 70211, Finland
| | - Rebecca Kuriyan
- Division of Nutrition, St John's Research Institute, Bengaluru, 560034, India
| | | | - Amy Taetzsch
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, USA
| | - Alex K Anderson
- Department of Foods and Nutrition, University of Georgia, Athens, GA, USA
| | - Rachel E Silver
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, USA
- Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA 02111, USA
| | - Kathryn Barger
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, USA
| | - Amy Krauss
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, USA
| | - Leila Karhunen
- Institute of Public Health and Clinical Nutrition, School of Medicine, University of Eastern Finland, Kuopio, 70211, Finland
| | - Xueying Zhang
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, PRC
- Chinese Academy of Sciences, Shijingshan District, Beijing 100049, PRC
- Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 2TZ, UK
| | - Catherine Hambly
- Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 2TZ, UK
| | - Ursula Schwab
- Institute of Public Health and Clinical Nutrition, School of Medicine, University of Eastern Finland, Kuopio, 70211, Finland
- Department of Medicine, Endocrinology and Clinical Nutrition, Kuopio University Hospital, Kuopio, Finland
| | - Andresa de Toledo Triffoni-Melo
- University of Ribeirao Preto (UNAERP), Ribeirao Preto, SP, Brazil
- Ribeirão Preto Medical School of University of Sao Paulo, Ribeirao Preto, SP, 14 049 900, Brazil
| | - Salima F Taylor
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, USA
| | - Christina Economos
- Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA 02111, USA
| | - Anura V Kurpad
- Division of Nutrition, St John's Research Institute, Bengaluru, 560034, India
| | - John R Speakman
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, PRC
- Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 2TZ, UK
- Center of Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, PRC
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153
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Tyagi A, Nguyen CU, Chong T, Michel CR, Fritz KS, Reisdorph N, Knaub L, Reusch JEB, Pugazhenthi S. SIRT3 deficiency-induced mitochondrial dysfunction and inflammasome formation in the brain. Sci Rep 2018; 8:17547. [PMID: 30510203 PMCID: PMC6277395 DOI: 10.1038/s41598-018-35890-7] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 11/11/2018] [Indexed: 12/17/2022] Open
Abstract
SIRT3, the primary mitochondrial deacetylase, plays a significant role in enhancing the function of mitochondrial proteins. Downregulation of SIRT3 is a key component of metabolic syndrome, a precondition for obesity, diabetes and cardiovascular diseases. In this study, we examined the effects of brain mitochondrial protein hyperacetylation in western diet-fed Sirt3-/- mice, a model for metabolic syndrome. Brain mitochondrial proteins were hyperacetylated, following western diet feeding and Sirt3 deletion. To identity these hyperacetylated proteins, we performed a comprehensive acetylome analysis by label-free tandem mass spectrometry. Gene ontology pathway analysis revealed Sirt3 deletion-mediated downregulation of enzymes in several metabolic pathways, including fatty acid oxidation and tricarboxylic acid cycle. Mitochondrial respiration was impaired at multiple states, along with lower levels of mitochondrial fission proteins Mfn1 and Mfn2. Cleavage of procaspase-1 suggested inflammasome formation. Assembly of inflammasomes with caspase-1 and NLRP3 was detected as shown by proximity ligation assay. Markers of neuroinflammation including microgliosis and elevated brain IL-1β expression were also observed. Importantly, these findings were further exacerbated in Sirt3-/- mice when fed a calorie-rich western diet. The observations of this study suggest that SIRT3 deficiency-induced brain mitochondrial dysfunction and neuroinflammation in metabolic syndrome may play a role in late-life cognitive decline.
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Affiliation(s)
- Alpna Tyagi
- Department of Medicine, Rocky Mountain Regional VA Medical Center, Aurora, CO, USA.,School of Medicine, University of Colorado-Anschutz Medical Campus, Aurora, CO, USA
| | - Christy U Nguyen
- Department of Medicine, Rocky Mountain Regional VA Medical Center, Aurora, CO, USA
| | - Thomas Chong
- Department of Medicine, Rocky Mountain Regional VA Medical Center, Aurora, CO, USA
| | - Cole R Michel
- Department of Pharmaceutical Sciences, University of Colorado-Anschutz Medical Campus, Aurora, CO, USA
| | - Kristofer S Fritz
- Department of Pharmaceutical Sciences, University of Colorado-Anschutz Medical Campus, Aurora, CO, USA
| | - Nichole Reisdorph
- Department of Pharmaceutical Sciences, University of Colorado-Anschutz Medical Campus, Aurora, CO, USA
| | - Leslie Knaub
- Department of Medicine, Rocky Mountain Regional VA Medical Center, Aurora, CO, USA.,School of Medicine, University of Colorado-Anschutz Medical Campus, Aurora, CO, USA
| | - Jane E B Reusch
- Department of Medicine, Rocky Mountain Regional VA Medical Center, Aurora, CO, USA.,School of Medicine, University of Colorado-Anschutz Medical Campus, Aurora, CO, USA
| | - Subbiah Pugazhenthi
- Department of Medicine, Rocky Mountain Regional VA Medical Center, Aurora, CO, USA. .,School of Medicine, University of Colorado-Anschutz Medical Campus, Aurora, CO, USA.
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154
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Early Exposure to a High-Fat Diet Impacts on Hippocampal Plasticity: Implication of Microglia-Derived Exosome-like Extracellular Vesicles. Mol Neurobiol 2018; 56:5075-5094. [PMID: 30474797 DOI: 10.1007/s12035-018-1435-8] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 11/15/2018] [Indexed: 12/18/2022]
Abstract
Adolescence is a transitional period from childhood to adulthood characterized by puberty and brain maturation involving behavioral changes and environmental vulnerability. Diet is one of the factors affecting brain health, potentially leading to long-lasting effects. Hence, we studied the impact of early exposure (P21-60) to a high-fat diet (HFD) on mouse hippocampus, analyzing inflammation, adult neurogenesis, dendritic spine plasticity, and spatial memory. Glycemia and seric pro-inflammatory IL1β were higher in HFD mice without differences on body weight. In the HFD hippocampus, neuroinflammation was evidenced by Iba1+ cells reactivity together with a higher expression of TNFα and IL1β while the neurogenic capability in the dentate gyrus was strongly reduced. We found a predominance of immature Dil-labeled dendritic spines from CA1 neurons along with diminished levels of the scaffold protein Shank2, suggesting a defective connectivity. Moreover, the HFD group exhibited spatial memory alterations. To elucidate whether microglia could be mediating HFD-associated neuronal changes, the lipotoxic context was emulated by incubating primary microglia with palmitate, a saturated fatty acid present in HFD. Palmitate induced a pro-inflammatory profile as shown by secreted cytokine levels. The isolated exosome fraction from palmitate-stimulated microglia induced an immature dendritic spine phenotype in primary GFP+ hippocampal neurons, in line with the in vivo findings. These results provide novel data concerning microglia to neuron communication and highlight that fat excess during a short and early period of life could negatively impact on cognition and synaptic plasticity in a neuroinflammatory context, where microglia-derived exosomes could be implicated. Graphical Abstract ᅟ.
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155
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Duffy CM, Hofmeister JJ, Nixon JP, Butterick TA. High fat diet increases cognitive decline and neuroinflammation in a model of orexin loss. Neurobiol Learn Mem 2018; 157:41-47. [PMID: 30471346 DOI: 10.1016/j.nlm.2018.11.008] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 10/26/2018] [Accepted: 11/16/2018] [Indexed: 12/23/2022]
Abstract
Midlife obesity is a risk factor for cognitive decline and is associated with the earlier onset of Alzheimer's disease (AD). Diets high in saturated fat potentiate the onset of obesity, microglial activation, and neuroinflammation. Signaling deficiencies in the hypothalamic peptide orexin and/or orexin fiber loss are linked to neurodegeneration, cognitive impairment, and neuroinflammation. Prior studies show that orexin is neuroprotective, suppresses neuroinflammation, and that treatment with orexin improves cognitive processes in orexin/ataxin-3 (O/A3) mice, a transgenic mouse model of orexin neurodegeneration. Our overall hypothesis is that loss of orexin contributes to high fat diet (HFD)-induced hippocampal neuroinflammation and cognitive decline. To examine this, we tested male O/A3 mice (7-8 mo. of age) in a two-way active avoidance (TWAA) hippocampus-dependent memory task. We tested whether (1) orexin loss impaired cognitive function; (2) HFD worsened cognitive impairment; and (3) HFD increased microglial activation and neuroinflammation. O/A3 mice showed significant impairments in TWAA task learning vs. wild type (WT) mice (increased escapes p < 0.05, reduced avoidances p < 0.0001). Mice were then placed on HFD (45% total fat, 31.4% saturated fat) or remained on normal chow (NC; 4% total fat and 1% saturated fat), and TWAA was retested at 2 and 4 weeks. Learning impairment was evident at both 2 and 4 weeks in O/A3 mice fed HFD for following diet exposure vs. WT mice on normal chow or HFD (increased escapes, reduced avoidances p < 0.05). Additionally, O/A3 mice had increased gene expression of the microglial activation marker Iba-1 (measured via qRT-PCR, p < 0.001). Further characterization of the microglial immune response genes in hippocampal tissue revealed a significant increase in CX3 chemokine receptor 1 (CX3CR1), tumor necrosis factor-alpha (TNF-α) and the mitochondria-associated enzyme immune responsive gene-1 (Irg1). Collectively, our results indicate that orexin loss impairs memory, and that HFD accelerates hippocampus-dependent learning deficits and the onset of neuroinflammation.
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Affiliation(s)
- C M Duffy
- Minneapolis Veterans Affairs Health Care System, Minneapolis, MN, United States; Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN, United States
| | - J J Hofmeister
- Minneapolis Veterans Affairs Health Care System, Minneapolis, MN, United States; Minneapolis Center for Veterans Research and Education, Minneapolis, MN, United States
| | - J P Nixon
- Minneapolis Veterans Affairs Health Care System, Minneapolis, MN, United States; Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN, United States; Minneapolis Center for Veterans Research and Education, Minneapolis, MN, United States
| | - T A Butterick
- Minneapolis Veterans Affairs Health Care System, Minneapolis, MN, United States; Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN, United States; Minneapolis Center for Veterans Research and Education, Minneapolis, MN, United States.
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156
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Rollins CPE, Gallino D, Kong V, Ayranci G, Devenyi GA, Germann J, Chakravarty MM. Contributions of a high-fat diet to Alzheimer's disease-related decline: A longitudinal behavioural and structural neuroimaging study in mouse models. NEUROIMAGE-CLINICAL 2018; 21:101606. [PMID: 30503215 PMCID: PMC6413478 DOI: 10.1016/j.nicl.2018.11.016] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 07/26/2018] [Accepted: 11/18/2018] [Indexed: 11/28/2022]
Abstract
Obesity is recognized as a significant risk factor for Alzheimer's disease (AD). Studies have supported that obesity accelerates AD-related pathophysiology and memory impairment in mouse models of AD. However, the nature of the brain structure-behaviour relationship mediating this acceleration remains unclear. In this manuscript we evaluated the impact of adolescent obesity on the brain morphology of the triple transgenic mouse model of AD (3xTg) and a non-transgenic control model of the same background strain (B6129s) using longitudinally acquired structural magnetic resonance imaging (MRI). At 8 weeks of age, animals were placed on a high-fat diet (HFD) or an ingredient-equivalent control diet (CD). Structural images were acquired at 8, 16, and 24 weeks. At 25 weeks, animals underwent the novel object recognition (NOR) task and the Morris water maze (MWM) to assess short-term non-associative memory and spatial memory, respectively. All analyses were carried out across four groups: B6129s-CD and -HFD and 3xTg-CD and -HFD. Neuroanatomical changes in MRI-derived brain morphology were assessed using volumetric and deformation-based analyses. HFD-induced obesity during adolescence exacerbated brain volume alterations by adult life in the 3xTg mouse model in comparison to control-fed mice and mediated volumetric alterations of select brain regions, such as the hippocampus. Further, HFD-induced obesity aggravated memory in all mice, lowering certain memory measures of B6129s control mice to the level of 3xTg mice maintained on a CD. Moreover, decline in the volumetric trajectories of hippocampal regions for all mice were associated with the degree of spatial memory impairments on the MWM. Our results suggest that obesity may interact with the brain changes associated with AD-related pathology in the 3xTg mouse model to aggravate brain atrophy and memory impairments and similarly impair brain structural integrity and memory capacity of non-transgenic mice. Further insight into this process may have significant implications in the development of lifestyle interventions for treatment of AD. Adolescent high-fat diet-induced obesity altered adult brain morphology and memory-related behaviours in a mouse model of AD High-fat feeding exacerbated brain volume changes in a mouse model of AD High-fat feeding mediated volumetric alterations of select brain regions, such as the hippocampus Degree of impairment on a spatial memory task showed linear trends with brain structural changes in AD-related regions High-fat feeding lowered certain memory measures of non-transgenic control mice
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Affiliation(s)
- Colleen P E Rollins
- Computational Brain Anatomy Laboratory, Cerebral Imaging Centre, Douglas Mental Health University Institute, Montreal, Quebec H4H 1R3, Canada; Department of Psychiatry, University of Cambridge, Herchel Smith Building, Cambridge CB2 0SP, United Kingdom.
| | - Daniel Gallino
- Computational Brain Anatomy Laboratory, Cerebral Imaging Centre, Douglas Mental Health University Institute, Montreal, Quebec H4H 1R3, Canada
| | - Vincent Kong
- Computational Brain Anatomy Laboratory, Cerebral Imaging Centre, Douglas Mental Health University Institute, Montreal, Quebec H4H 1R3, Canada; Integrated Program in Neuroscience, McGill University, Montreal, Quebec H3A 2B4, Canada
| | - Gülebru Ayranci
- Computational Brain Anatomy Laboratory, Cerebral Imaging Centre, Douglas Mental Health University Institute, Montreal, Quebec H4H 1R3, Canada
| | - Gabriel A Devenyi
- Computational Brain Anatomy Laboratory, Cerebral Imaging Centre, Douglas Mental Health University Institute, Montreal, Quebec H4H 1R3, Canada; Department of Psychiatry, McGill University, Montreal, Quebec H3A 1A1, Canada
| | - Jürgen Germann
- Computational Brain Anatomy Laboratory, Cerebral Imaging Centre, Douglas Mental Health University Institute, Montreal, Quebec H4H 1R3, Canada
| | - M Mallar Chakravarty
- Computational Brain Anatomy Laboratory, Cerebral Imaging Centre, Douglas Mental Health University Institute, Montreal, Quebec H4H 1R3, Canada; Integrated Program in Neuroscience, McGill University, Montreal, Quebec H3A 2B4, Canada; Department of Psychiatry, McGill University, Montreal, Quebec H3A 1A1, Canada; Department of Biological and Biomedical Engineering, McGill University, Montreal, Quebec H3A 2B4, Canada.
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157
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Zhou Y, Zhu H, Wu HY, Jin LY, Chen B, Pang HY, Ming ZH, Cheng Y, Zhou CL, Guo MX, Huang YT, Yu DQ, Sheng JZ, Huang HF. Diet-Induced Paternal Obesity Impairs Cognitive Function in Offspring by Mediating Epigenetic Modifications in Spermatozoa. Obesity (Silver Spring) 2018; 26:1749-1757. [PMID: 30358144 DOI: 10.1002/oby.22322] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 08/29/2018] [Accepted: 08/30/2018] [Indexed: 12/21/2022]
Abstract
OBJECTIVE This study aimed to determine the effects of diet-induced paternal obesity on cognitive function in mice offspring. METHODS Male mice (F0) were randomized to receive either a control diet (10 kcal% fat) or a high-fat diet (HFD; 60 kcal% fat) for 10 weeks before being mated with normal females to generate F1 offspring. Male F1 offspring were mated with normal females to generate F2 offspring. Behavioral tests were used to assess cognitive functions in F1 and F2 offspring. Reduced representation bisulfite sequencing was used to the explore mechanisms of epigenetic inheritance. RESULTS HFD-induced paternal obesity resulted in cognitive impairments in F1 offspring, potentially due, at least in part, to increased methylation of the BDNF gene promoter, which was inherited from F0 spermatozoa. BDNF/tyrosine receptor kinase B signaling was associated with cognitive impairments in HFD-fed F1 offspring. However, there were no significant changes in F2 offspring. CONCLUSIONS The findings provide evidence of intergenerational effects of paternal obesity on cognitive function in offspring occurring via epigenetic spermatozoan modifications.
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Affiliation(s)
- Yin Zhou
- Key Laboratory of Reproductive Genetics, Ministry of Education, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
- Center for Reproductive Medicine, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Hong Zhu
- Key Laboratory of Reproductive Genetics, Ministry of Education, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Hai-Yan Wu
- Key Laboratory of Reproductive Genetics, Ministry of Education, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Lu-Yang Jin
- Key Laboratory of Reproductive Genetics, Ministry of Education, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Bin Chen
- Key Laboratory of Reproductive Genetics, Ministry of Education, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Hai-Yan Pang
- Key Laboratory of Reproductive Genetics, Ministry of Education, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Zhen-Hua Ming
- Key Laboratory of Reproductive Genetics, Ministry of Education, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Yi Cheng
- Key Laboratory of Reproductive Genetics, Ministry of Education, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Cheng-Liang Zhou
- Key Laboratory of Reproductive Genetics, Ministry of Education, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Meng-Xi Guo
- International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Yi-Ting Huang
- Center for Reproductive Medicine, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Dan-Qing Yu
- Center for Reproductive Medicine, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Jian-Zhong Sheng
- Key Laboratory of Reproductive Genetics, Ministry of Education, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
- Department of Pathology and Pathophysiology, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - He-Feng Huang
- Key Laboratory of Reproductive Genetics, Ministry of Education, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
- International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
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158
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Malpetti M, Sala A, Vanoli EG, Gianolli L, Luzi L, Perani D. Unfavourable gender effect of high body mass index on brain metabolism and connectivity. Sci Rep 2018; 8:12584. [PMID: 30135519 PMCID: PMC6105632 DOI: 10.1038/s41598-018-30883-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 07/18/2018] [Indexed: 12/25/2022] Open
Abstract
The influence of Body Mass Index (BMI) on neurodegeneration in dementia has yet to be elucidated. We aimed at exploring the effects of BMI levels on cerebral resting-state metabolism and brain connectivity, as crucial measures of synaptic function and activity, in a large group of patients with Alzheimer's Dementia (AD) (n = 206), considering gender. We tested the correlation between BMI levels and brain metabolism, as assessed by 18F-FDG-PET, and the modulation of the resting-state functional networks by BMI. At comparable dementia severity, females with high BMI can withstand a lower degree of brain metabolism dysfunction, as shown by a significant BMI-brain metabolism correlation in the temporal-parietal regions, which are typically vulnerable to AD pathology (R = 0.269, p = 0.009). Of note, high BMI was also associated with reduced connectivity in frontal and limbic brain networks, again only in AD females (p < 0.05 FDR-corrected, k = 100 voxels). This suggests a major vulnerability of neural systems known to be selectively involved in brain compensatory mechanisms in AD females. These findings indicate a strong gender effect of high BMI and obesity in AD, namely reducing the available reserve mechanisms in female patients. This brings to considerations for medical practice and health policy.
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Affiliation(s)
- Maura Malpetti
- Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy
| | - Arianna Sala
- Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy
- Vita-Salute San Raffaele University, Milan, Italy
| | | | - Luigi Gianolli
- Nuclear Medicine Unit, San Raffaele Hospital, Milan, Italy
| | - Livio Luzi
- Metabolism Research Center and Endocrinology Unit, IRCCS Policlinico San Donato Milanese, Milan, Italy
| | - Daniela Perani
- Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy.
- Vita-Salute San Raffaele University, Milan, Italy.
- Nuclear Medicine Unit, San Raffaele Hospital, Milan, Italy.
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159
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Modulation of Glucose Metabolism in Hippocampal Neurons by Adiponectin and Resistin. Mol Neurobiol 2018; 56:3024-3037. [PMID: 30076527 DOI: 10.1007/s12035-018-1271-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 07/19/2018] [Indexed: 12/20/2022]
Abstract
Obese individuals exhibit altered circulating levels of adipokines, the proteins secreted by adipose tissue to mediate tissue cross-talk and regulate appetite and energy expenditure. The effect of adipokines on neuronal glucose metabolism, however, remains largely unknown. Two adipokines produced in adipose tissue, adiponectin and resistin, can gain access to the central nervous system (CNS), and their levels in the cerebrospinal fluid (CSF) are altered in obesity. We hypothesized that dysregulated adipokines in the CNS may underlie the reported link between obesity and higher risk of neurological disorders like Alzheimer's disease (AD), by affecting glucose metabolism in hippocampal neurons. Using cultured primary rat hippocampal neurons and mouse hippocampus slices, we show that recombinant adiponectin and resistin, at a concentration found in the CSF, have opposing effects on glucose metabolism. Adiponectin enhanced glucose uptake, glycolytic rate, and ATP production through an AMP-activated protein kinase (AMPK)-dependent mechanism; inhibiting AMPK abrogated the effects of adiponectin on glucose uptake and utilization. In contrast, resistin reduced glucose uptake, glycolytic rate, and ATP production, in part, by inhibiting hexokinase (HK) activity in hippocampal neurons. These data suggest that altered CNS levels of adipokines in the context of obesity may impact glucose metabolism in hippocampal neurons, brain region involved in learning and memory functions.
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160
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Liao PJ, Lin TY, Ting MK, Peng TI, Chiou WK, Chen LH, Hsu KH. Chest width, waist circumference, and thigh circumference are predictors of dementia. Int J Geriatr Psychiatry 2018; 33:1019-1027. [PMID: 29726588 DOI: 10.1002/gps.4887] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 03/15/2018] [Indexed: 11/11/2022]
Abstract
OBJECTIVE Few studies have investigated the relationship between specific body measures and dementia. METHODS Three-dimensional anthropometric body surface scanning data containing 38 body measures were collected from 6831 participants from the health examination department of a medical center in Taiwan during 2000 to 2008, and 236 dementia cases were identified during the 10-year follow-up. A multiple Cox regression analysis was performed. RESULTS Specific body measures, namely chest width (hazard ratio [HR] = 0.90; 95% confidence interval [CI] = 0.83-0.98), and right thigh circumference (HR = 0.93; 95% CI = 0.90-0.96), were protective predictors to dementia occurrence. Waist circumference (HR = 1.03; 95% CI = 1.02-1.05) was a risk factor in dementia occurrence. Among the combinations, dementia risk was higher in participants with a larger waist circumference and a smaller right thigh circumference, with the highest HR of 2.49 (95% CI = 1.54-4.03). CONCLUSION The body measures provide clues for future applications and scientific merits in both clinical and preventive medicine.
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Affiliation(s)
- Pei-Ju Liao
- Department of Health Care Administration, Oriental Institute of Technology, New Taipei City, Taiwan
| | - Tzu-Yu Lin
- Healthy Aging Research Center, Chang Gung University, Taoyuan, Taiwan
| | - Ming-Kuo Ting
- Division of Endocrinology and Metabolism, Chang Gung Memorial Hospital, Keelung, Taiwan
| | - Tsung-I Peng
- Department of Neurology, Chang Gung Memorial Hospital, Keelung Branch, Keelung, Taiwan, and Department of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Wen-Ko Chiou
- Division of Endocrinology and Metabolism, Chang Gung Memorial Hospital, Keelung, Taiwan.,Department of Industrial Design, Graduate Institute of Business and Management, Chang Gung University, Taoyuan, Taiwan
| | - Li-Hsuan Chen
- Laboratory for Epidemiology, Department of Health Care Management, Chang Gung University, Taoyuan, Taiwan
| | - Kuang-Hung Hsu
- Healthy Aging Research Center, Chang Gung University, Taoyuan, Taiwan.,Laboratory for Epidemiology, Department of Health Care Management, Chang Gung University, Taoyuan, Taiwan.,Department of Emergency Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan.,Department of Urology, Chang Gung Memorial Hospital, Taoyuan, Taiwan
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161
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Loprinzi PD, Frith E. Obesity and episodic memory function. J Physiol Sci 2018; 68:321-331. [PMID: 29667132 PMCID: PMC10717800 DOI: 10.1007/s12576-018-0612-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 04/10/2018] [Indexed: 12/30/2022]
Abstract
Obesity-related lifestyle factors, such as physical activity behavior and dietary intake, have been shown to be associated with episodic memory function. From animal work, there is considerable biological plausibility linking obesity with worse memory function. There are no published systematic reviews evaluating the effects of obesity on episodic memory function among humans, and examining whether physical activity and diet influences this obesity-memory link. Thus, the purpose of this systematic review was to evaluate the totality of research examining whether obesity is associated with episodic memory function, and whether physical activity and dietary behavior confounds this relationship. A review approach was employed, using PubMed, PsychInfo, and Sports Discus databases. Fourteen studies met our criteria. Among these 14 reviewed studies, eight were cross-sectional, four were prospective, and two employed a randomized controlled experimental design. Twelve of the 14 studies did not take into consideration dietary behavior in their analysis, and similarly, nine of the 14 studies did not take into consideration participant physical activity behavior. Among the 14 studies, ten found an inverse association of weight status on memory function, but for one of these studies, this association was attenuated after controlling for physical activity. Among the 14 evaluated studies, four did not find a direct effect of weight status on memory. Among the four null studies, one, however, found an indirect effect of BMI on episodic memory and another found a moderation effect of BMI and age on memory function. It appears that obesity may be associated with worse memory function, with the underlying mechanisms discussed herein. At this point, it is uncertain whether adiposity, itself, is influencing memory changes, or rather, whether adiposity-related lifestyle behaviors (e.g., physical inactivity and diet) are driving the obesity-memory relationship.
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Affiliation(s)
- Paul D Loprinzi
- Exercise Psychology Laboratory, Physical Activity Epidemiology Laboratory, Department of Health, Exercise Science and Recreation Management, The University of Mississippi, University, MS, 38677, USA.
| | - Emily Frith
- Exercise Psychology Laboratory, Physical Activity Epidemiology Laboratory, Department of Health, Exercise Science and Recreation Management, The University of Mississippi, University, MS, 38677, USA
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163
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Regulation of Immune Cell Function by PPARs and the Connection with Metabolic and Neurodegenerative Diseases. Int J Mol Sci 2018; 19:ijms19061575. [PMID: 29799467 PMCID: PMC6032042 DOI: 10.3390/ijms19061575] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 05/16/2018] [Accepted: 05/23/2018] [Indexed: 01/01/2023] Open
Abstract
Increasing evidence points towards the existence of a bidirectional interconnection between metabolic disease and neurodegenerative disorders, in which inflammation is linking both together. Activation of members of the peroxisome proliferator-activated receptor (PPAR) family has been shown to have beneficial effects in these interlinked pathologies, and these improvements are often attributed to anti-inflammatory effects of PPAR activation. In this review, we summarize the role of PPARs in immune cell function, with a focus on macrophages and T cells, and how this was shown to contribute to obesity-associated inflammation and insulin resistance, atherosclerosis, and neurodegenerative disorders. We address gender differences as a potential explanation in observed contradictory results, and we highlight PPAR-induced metabolic changes as a potential mechanism of regulation of immune cell function through these nuclear receptors. Together, immune cell-specific activation of PPARs present a promising therapeutic approach to treat both metabolic and neurodegenerative diseases.
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164
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Haley AP, Oleson S, Pasha E, Birdsill A, Kaur S, Thompson J, Tanaka H. Phenotypic heterogeneity of obesity-related brain vulnerability: one-size interventions will not fit all. Ann N Y Acad Sci 2018; 1428:89-102. [PMID: 29741211 DOI: 10.1111/nyas.13673] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 02/10/2018] [Accepted: 02/17/2018] [Indexed: 01/07/2023]
Abstract
Intact memory and problem solving are key to functional independence and quality of life in older age. Considering the unprecedented demographic shift toward a greater number of older adults than children in the United States in the next few decades, it is critically important for older adults to maintain work productivity and functional independence for as long as possible. Implementing early interventions focused on modifiable risk factors for cognitive decline at midlife is a strategy with the highest chance of success at present, bearing in mind the current lack of dementia cures. We present a selective, narrative review of evidence linking nutrition, body composition, vascular health, and brain function in midlife to highlight the phenotypic heterogeneity of obesity-related brain vulnerability and to endorse the development of individually tailored lifestyle modification plans for primary prevention of cognitive decline.
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Affiliation(s)
- Andreana P Haley
- Department of Psychology, The University of Texas at Austin, Austin, Texas.,Imaging Research Center, The University of Texas at Austin, Austin, Texas
| | - Stephanie Oleson
- Department of Psychology, The University of Texas at Austin, Austin, Texas
| | - Evan Pasha
- Department of Kinesiology and Health Education, The University of Texas at Austin, Austin, Texas
| | - Alex Birdsill
- Department of Psychology, The University of Texas at Austin, Austin, Texas
| | - Sonya Kaur
- Department of Psychology, The University of Texas at Austin, Austin, Texas
| | - Janelle Thompson
- Department of Psychology, The University of Texas at Austin, Austin, Texas
| | - Hirofumi Tanaka
- Department of Kinesiology and Health Education, The University of Texas at Austin, Austin, Texas
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165
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Bloch K, Gil-Ad I, Vanichkin A, Hornfeld SH, Koroukhov N, Taler M, Vardi P, Weizman A. Intracerebroventricular Streptozotocin Induces Obesity and Dementia in Lewis Rats. J Alzheimers Dis 2018; 60:121-136. [PMID: 28800326 DOI: 10.3233/jad-161289] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Animal models of dementia associated with metabolic abnormalities play an important role in understanding the bidirectional relationships between these pathologies. Rodent strains develop cognitive dysfunctions without alteration of peripheral metabolism following intracerebroventricular administration of streptozotocin (icv-STZ). OBJECTIVE We aimed to estimate the effect of icv-STZ on cognitive functions and peripheral metabolism in Lewis rats, which are rarely used for the induction of cognitive abnormalities. METHODS Inbred adult Lewis rats were treated with single icv-STZ (3 mg/kg). Cognitive functions were assessed using Morris water maze (MWM) test and locomotion by the Open Field test. Metabolic alterations were studied using histological and biochemical analysis of brain and peripheral tissues. RESULTS The icv-STZ induced rapid weight decline during the first two weeks. Thereafter, the rats showed an accelerated weight gain. Three months after the icv-STZ treatment, the rats were severely obese and revealed fatty liver, pancreatic islet hypertrophy, significantly elevated levels of blood insulin, leptin, and adiponectin, but intact peripheral glucose homeostasis. The icv-STZ rats expressed amyloid-β deposits in blood vessels of leptomeningeal area, microgliosis, astrogliosis, and spongiosis in fimbria-fornix area of hippocampus. Locomotor activities of icv-STZ treated and sham-operated rats were similar. In the MWM test, the icv-STZ treated rats demonstrated severely impaired spatial learning during both acquisition and reversal phases. CONCLUSIONS Icv-STZ treated Lewis rats develop severe dementia associated with obesity and peripheral metabolic abnormalities. This animal model may be useful for exploring the pathophysiological relationship between obesity and dementia and provides a new tool for development of effective therapy.
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Affiliation(s)
- Konstantin Bloch
- Laboratory of Diabetes and Obesity Research, Felsenstein Medical Research Center, Sackler School of Medicine, Tel Aviv University, Petah Tikva, Israel
| | - Irit Gil-Ad
- Laboratory of Biological Psychiatry, Felsenstein Medical Research Center, Sackler School of Medicine, Tel Aviv University, Petah Tikva, Israel
| | - Alexey Vanichkin
- Laboratory of Transplantation, Felsenstein Medical Research Center, Sackler School of Medicine, Tel Aviv University, Petah Tikva, Israel
| | - Shay Henry Hornfeld
- Laboratory of Biological Psychiatry, Felsenstein Medical Research Center, Sackler School of Medicine, Tel Aviv University, Petah Tikva, Israel
| | - Nickolay Koroukhov
- Laboratory of Biological Psychiatry, Felsenstein Medical Research Center, Sackler School of Medicine, Tel Aviv University, Petah Tikva, Israel
| | - Michal Taler
- Laboratory of Biological Psychiatry, Felsenstein Medical Research Center, Sackler School of Medicine, Tel Aviv University, Petah Tikva, Israel
| | - Pnina Vardi
- Laboratory of Diabetes and Obesity Research, Felsenstein Medical Research Center, Sackler School of Medicine, Tel Aviv University, Petah Tikva, Israel
| | - Abraham Weizman
- Laboratory of Biological Psychiatry, Felsenstein Medical Research Center, Sackler School of Medicine, Tel Aviv University, Petah Tikva, Israel.,Research Unit, Geha Mental Health Center, Petah Tikva, Israel
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166
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Baranowski BJ, MacPherson REK. Acute exercise induced BDNF-TrkB signalling is intact in the prefrontal cortex of obese, glucose-intolerant male mice. Appl Physiol Nutr Metab 2018; 43:1083-1089. [PMID: 29726700 DOI: 10.1139/apnm-2018-0108] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Obesity and glucose intolerance have been directly implicated in the pathology of Alzheimer's disease. It is thought that diet-induced obesity causes a reduction in neuronal plasticity through a reduction in the neurotrophin: brain-derived neurotrophic factor (BDNF). Previous work has demonstrated that acute exercise in healthy lean animals increases BDNF-TrkB signalling in the brain. However, if this effect is intact in a state of obesity remains unknown. The purpose of this study is to determine the effects of a single bout of exercise on BDNF-TrkB signalling in the prefrontal cortex and hippocampus from obese glucose intolerant mice. Male C57BL/6 mice were fed a low-fat diet (10% kcals from lard) or a high-fat diet (HFD, 60% kcals from lard) for 7 weeks. A subset of HFD mice underwent an acute bout of exercise (treadmill running: 15 m/min, 5% incline, 120 min) followed by a recovery period of 2 h, after which point the prefrontal cortex and hippocampus were collected. The HFD increased body mass and glucose intolerance (p < 0.05). Prefrontal cortex from HFD mice demonstrated lower BDNF protein content, reduced phosphorylation of the BDNF receptor (TrkB), and its downstream effector cAMP response element-binding protein (CREB), as well as PGC-1α and ERα) protein content (p < 0.05). Two hours following the acute exercise bout, TrkB and CREB phosphorylation as well as PGC-1α and ER-α protein content were recovered (p < 0.05). Our findings demonstrate for the first time that an acute bout of exercise can recover BDNF-TrkB signalling in the prefrontal cortex of obese mice.
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Affiliation(s)
- Bradley J Baranowski
- a Department of Health Sciences, Brock University, St. Catharines, ON L2S 3A1, Canada
| | - Rebecca E K MacPherson
- a Department of Health Sciences, Brock University, St. Catharines, ON L2S 3A1, Canada.,b Centre for Neuroscience, Brock University, St. Catharines, Ontario, Canada
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167
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Hansen SN, Ipsen DH, Schou-Pedersen AM, Lykkesfeldt J, Tveden-Nyborg P. Long term Westernized diet leads to region-specific changes in brain signaling mechanisms. Neurosci Lett 2018; 676:85-91. [DOI: 10.1016/j.neulet.2018.04.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 04/04/2018] [Accepted: 04/06/2018] [Indexed: 12/14/2022]
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168
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Tortelli R, Lozupone M, Guerra V, Barulli MR, Imbimbo BP, Capozzo R, Grasso A, Tursi M, Di Dio C, Sardone R, Giannelli G, Seripa D, Misciagna G, Panza F, Logroscino G. Midlife Metabolic Profile and the Risk of Late-Life Cognitive Decline. J Alzheimers Dis 2018; 59:121-130. [PMID: 28582862 DOI: 10.3233/jad-170153] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Among metabolic syndrome components, the effects of higher plasma glucose levels on cognitive decline (CD) have been considered in few studies. We evaluated the associations among midlife glycemia, total cholesterol, high-density lipoprotein cholesterol, triglycerides, midlife insulin resistance [homeostasis model assessment for insulin resistance (HOMA-index)], and CD in the older subjects of the population-based MICOL Study (Castellana Grotte, Italy) at baseline (M1) and at follow-ups seven (M2) and twenty years later (M3). At M1, a dementia risk score and a composite cardiovascular risk score for dementia were calculated. For 797 subjects out of 833, we obtained a Mini-Mental State Examination (MMSE) score at M3, subdividing these subjects in three cognitive functioning subgroups: normal cognition, mild CD, and moderate-severe CD. Mean fasting glycemia at baseline was significantly higher in moderate-severe CD subgroup (114.6±71.4 mg/dl) than in the normal cognition subgroup (101.2±20.6). Adjusting for gender, age, and other metabolic components, higher fasting glycemia values both at M1 [odds ratio (OR) = 1.31; 95% confidence interval (CI): 1.08-1.59] and M2 (OR = 1.26; 95% CI: 1.01-1.57) were associated with an increased risk of moderate-severe CD. Mean HOMA index value was significantly higher in the moderate-severe CD subgroup (5.7±9.4) compared to the normal cognition subgroup (2.9±1.4) at M1. The dementia risk probability (MMSE < 24) increased moving through higher categories of the dementia risk score and decreased as long as the cardiovascular score increased. The present findings highlighted the indication to control blood glucose levels, regardless of a diagnosis of diabetes mellitus, as early as midlife for prevention of late-life dementia.
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Affiliation(s)
- Rosanna Tortelli
- Department of Clinical Research in Neurology, Unit of Neurodegenerative Disease, University of Bari "Aldo Moro" at "Pia Fondazione Card. G. Panico", Tricase, Lecce, Italy
| | - Madia Lozupone
- Department of Basic Medicine, Neurodegenerative Disease Unit, Neuroscience, and Sense Organs, University of Bari Aldo Moro, Bari, Italy
| | - Vito Guerra
- National Institute of Gastroenterology "Saverio de Bellis", Research Hospital, Castellana Grotte Bari, Italy
| | - Maria Rosaria Barulli
- Department of Clinical Research in Neurology, Unit of Neurodegenerative Disease, University of Bari "Aldo Moro" at "Pia Fondazione Card. G. Panico", Tricase, Lecce, Italy
| | - Bruno P Imbimbo
- Department of Research & Development, Chiesi Farmaceutici, Parma, Italy
| | - Rosa Capozzo
- Department of Clinical Research in Neurology, Unit of Neurodegenerative Disease, University of Bari "Aldo Moro" at "Pia Fondazione Card. G. Panico", Tricase, Lecce, Italy
| | - Alessandra Grasso
- Department of Basic Medicine, Neurodegenerative Disease Unit, Neuroscience, and Sense Organs, University of Bari Aldo Moro, Bari, Italy
| | - Marianna Tursi
- Department of Basic Medicine, Neurodegenerative Disease Unit, Neuroscience, and Sense Organs, University of Bari Aldo Moro, Bari, Italy
| | - Cristina Di Dio
- Department of Clinical Research in Neurology, Unit of Neurodegenerative Disease, University of Bari "Aldo Moro" at "Pia Fondazione Card. G. Panico", Tricase, Lecce, Italy
| | - Rodolfo Sardone
- National Institute of Gastroenterology "Saverio de Bellis", Research Hospital, Castellana Grotte Bari, Italy
| | - Gianluigi Giannelli
- National Institute of Gastroenterology "Saverio de Bellis", Research Hospital, Castellana Grotte Bari, Italy
| | - Davide Seripa
- Department of Medical Sciences, Geriatric Unit and Gerontology-Geriatrics Research Laboratory, IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Foggia, Italy
| | - Giovanni Misciagna
- National Institute of Gastroenterology "Saverio de Bellis", Research Hospital, Castellana Grotte Bari, Italy
| | - Francesco Panza
- Department of Clinical Research in Neurology, Unit of Neurodegenerative Disease, University of Bari "Aldo Moro" at "Pia Fondazione Card. G. Panico", Tricase, Lecce, Italy.,Department of Basic Medicine, Neurodegenerative Disease Unit, Neuroscience, and Sense Organs, University of Bari Aldo Moro, Bari, Italy.,Department of Medical Sciences, Geriatric Unit and Gerontology-Geriatrics Research Laboratory, IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Foggia, Italy
| | - Giancarlo Logroscino
- Department of Clinical Research in Neurology, Unit of Neurodegenerative Disease, University of Bari "Aldo Moro" at "Pia Fondazione Card. G. Panico", Tricase, Lecce, Italy.,Department of Basic Medicine, Neurodegenerative Disease Unit, Neuroscience, and Sense Organs, University of Bari Aldo Moro, Bari, Italy
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Cifre M, Palou A, Oliver P. Cognitive impairment in metabolically-obese, normal-weight rats: identification of early biomarkers in peripheral blood mononuclear cells. Mol Neurodegener 2018; 13:14. [PMID: 29566703 PMCID: PMC5863821 DOI: 10.1186/s13024-018-0246-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 03/13/2018] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND Metabolically-obese, normal-weight (MONW) individuals are not obese in terms of weight and height but have a number of obesity-related features (e.g. greater visceral adiposity, insulin resistance, and increased risk of cardiovascular disease). The MONW phenotype is related to the intake of unbalanced diets, such as those rich in fat. Increasing evidence shows a relationship between high-fat diet consumption and mild cognitive impairment and dementia. Thus, MONW individuals could be at a greater risk of cognitive dysfunction. We aimed to evaluate whether MONW-like animals present gene expression alterations in the hippocampus associated with an increased risk of cognitive impairment, and to identify early biomarkers of cognitive dysfunction in peripheral blood mononuclear cells (PBMC). METHODS Wistar rats were chronically fed with a 60% (HF60) or a 45% (HF45) high-fat diet administered isocalorically to control animals to mimic MONW features. Expression analysis of cognitive decline-related genes was performed using RT-qPCR, and working memory was assessed using a T-maze. RESULTS High-fat diet consumption altered the pattern of gene expression in the hippocampus, clearly pointing to cognitive decline, which was accompanied by a worse performance in the T-maze in HF60 animals. Remarkably, Syn1 and Sorl1 mRNA showed the same expression pattern in both the hippocampus and the PBMC obtained at different time-points in the HF60 group, even before other pathological signs were observed. CONCLUSIONS Our results demonstrate that long-term intake of high-fat diets, even in the absence of obesity, leads to cognitive disruption that is reflected in PBMC transcriptome. Therefore, PBMC are revealed as a plausible, minimally-invasive source of early biomarkers of cognitive impairment associated with increased fat intake.
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Affiliation(s)
- Margalida Cifre
- Laboratory of Molecular Biology, Nutrition and Biotechnology, Universitat de les Illes Balears and CIBER de Fisiopatología de la Obesidad y Nutrición (CIBERobn), Cra. Valldemossa Km 7.5, E-07122, Palma de Mallorca, Spain
| | - Andreu Palou
- Laboratory of Molecular Biology, Nutrition and Biotechnology, Universitat de les Illes Balears and CIBER de Fisiopatología de la Obesidad y Nutrición (CIBERobn), Cra. Valldemossa Km 7.5, E-07122, Palma de Mallorca, Spain.
| | - Paula Oliver
- Laboratory of Molecular Biology, Nutrition and Biotechnology, Universitat de les Illes Balears and CIBER de Fisiopatología de la Obesidad y Nutrición (CIBERobn), Cra. Valldemossa Km 7.5, E-07122, Palma de Mallorca, Spain
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170
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Iso-α-acids, bitter components of beer, prevent obesity-induced cognitive decline. Sci Rep 2018; 8:4760. [PMID: 29555941 PMCID: PMC5859182 DOI: 10.1038/s41598-018-23213-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 03/07/2018] [Indexed: 12/28/2022] Open
Abstract
Dementia and cognitive decline have become worldwide public health problems, and it was recently reported that life-style related diseases and obesity are key risk factors in dementia. Iso-α-acids, hop-derived bitter components of beer, have been reported to have various physiological functions via activation of peroxisome proliferator-activated receptor γ. In this report, we demonstrated that daily intake of iso-α-acids suppresses inflammations in the hippocampus and improves cognitive decline induced by high fat diet (HFD). Body weight, epididymal fat weight, and plasma triglyceride levels were increased in HFD-fed mice, and significantly decreased in iso-α-acids supplemented HFD-fed mice. HFD feeding enhances the production of inflammatory cytokines and chemokines, such as TNF-α, which was significantly suppressed by iso-α-acids administration. HFD-induced neuroinflammation caused lipid peroxidation, neuronal loss, and atrophy in hippocampus, and those were not observed in iso-α-acids-treated mice. Furthermore, iso-α-acids intake significantly improved cognitive decline induced by HFD-feeding. Iso-α-acids are food derived components that suppressing both lipid accumulation and brain inflammation, thus iso-α-acids might be beneficial for the risk of dementia increased by obesity and lifestyle-related diseases.
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171
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Furiya Y, Tomiyama T, Izumi T, Ohba N, Ueno S. Rivastigmine Improves Appetite by Increasing the Plasma Acyl/Des-Acyl Ghrelin Ratio and Cortisol in Alzheimer Disease. Dement Geriatr Cogn Dis Extra 2018; 8:77-84. [PMID: 29706984 PMCID: PMC5921190 DOI: 10.1159/000487358] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 02/02/2018] [Indexed: 01/13/2023] Open
Abstract
Background Weight loss accelerates cognitive decline and increases mortality in patients with dementia. While acetylcholinesterase (AChE) inhibitors are known to cause appetite loss, we sometimes encounter patients in whom switching from donepezil (AChE inhibitor) to rivastigmine (AChE and butyrylcholinesterase [BuChE] inhibitor) improves appetite. Since BuChE inactivates ghrelin, a potent orexigenic hormone, we speculated that rivastigmine improves appetite by inhibiting BuChE-mediated ghrelin inactivation. Methods The subjects were patients with mild to moderate Alzheimer disease treated with either rivastigmine patch (n = 11) or donepezil (n = 11) for 6 months. Before and after treatment, we evaluated appetite (0, decreased; 1, slightly decreased; 2, normal; 3, slightly increased; 4, increased), cognitive function, and blood biochemical variables, including various hormones. Results Rivastigmine treatment significantly improved appetite (from 1.6 ± 0.5 to 2.6 ± 0.7), whereas donepezil treatment did not (from 2.0 ± 0.0 to 1.8 ± 0.4). Simultaneously, rivastigmine, but not donepezil, significantly decreased the serum cholinesterase activity (from 304.3 ± 60.5 to 246.8 ± 78.5 IU/L) and increased the cortisol level (from 11.86 ± 3.12 to 14.61 ± 3.29 μg/dL) and the acyl/des-acyl ghrelin ratio (from 4.03 ± 2.96 to 5.28 ± 2.72). The levels of leptin, insulin, total ghrelin, and cognitive function were not significantly affected by either treatment. Conclusions Our results suggest that compared with donepezil, rivastigmine has the advantage of improving appetite by increasing the acyl/des-acyl ghrelin ratio and cortisol level, thereby preventing weight loss.
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Affiliation(s)
- Yoshiko Furiya
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Takami Tomiyama
- Department of Translational Neuroscience, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Tesseki Izumi
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Naoki Ohba
- Department of Neurology, Nara Medical University, Kashihara, Japan.,Department of Neurology, Heisei Memorial Hospital, Kashihara, Japan
| | - Satoshi Ueno
- Department of Neurology, Nara Medical University, Kashihara, Japan
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172
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Rius-Pérez S, Tormos A, Pérez S, Taléns-Visconti R. Patología vascular: ¿causa o efecto en la enfermedad de Alzheimer? Neurologia 2018; 33:112-120. [DOI: 10.1016/j.nrl.2015.07.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 07/28/2015] [Indexed: 10/23/2022] Open
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173
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Rius-Pérez S, Tormos A, Pérez S, Taléns-Visconti R. Vascular pathology: Cause or effect in Alzheimer disease? NEUROLOGÍA (ENGLISH EDITION) 2018. [DOI: 10.1016/j.nrleng.2015.07.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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174
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Wang A, Anderson BM, Novakovic ZM, Grasso P. [D-Leu-4]-OB3 and MA-[D-Leu-4]-OB3, small molecule synthetic peptide leptin mimetics, improve glycemic control in diet-induced obese (DIO) mice. Peptides 2018; 101:51-59. [PMID: 29269073 DOI: 10.1016/j.peptides.2017.12.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 12/05/2017] [Accepted: 12/13/2017] [Indexed: 02/06/2023]
Abstract
We have previously shown that following oral delivery in dodecyl maltoside (DDM), [D-Leu-4]-OB3 and its myristic acid conjugate, MA-[D-Leu-4]-OB3, improved energy balance and glucose homeostasis in genetically obese/diabetic mouse models. More recently, we have provided immunohistochemical evidence indicating that these synthetic peptide leptin mimetics cross the blood-brain barrier and concentrate in the area of the arcuate nucleus of the hypothalamus in normal C57BL/6J and Swiss Webster mice, in genetically obese ob/ob mice, and in diet-induced obese (DIO) mice. In the present study, we describe the effects of oral delivery of [D-Leu-4]-OB3 and MA-[D-Leu-4]-OB3 on glycemic control in diet-induced (DIO) mice, a non-genetic rodent model of obesity and its associated insulin resistance, which more closely recapitulates common obesity and diabetes in humans. Male C57BL/6J and DIO mice, 17, 20, and 28 weeks of age, were maintained on a low-fat or high-fat diet and given vehicle (DDM) alone or [D-Leu-4]-OB3 or MA-[D-Leu-4]-OB3 in DDM by oral gavage for 12 or 14 days. Body weight gain, food and water intake, fasting blood glucose, oral glucose tolerance, and serum insulin levels were measured. Our data indicate that (1) [D-Leu-4]-OB3 and MA-[D-Leu-4]-OB3 restore glucose tolerance in male DIO mice maintained on a high-fat diet to levels comparable to those of non-obese C57BL/6J wild-type mice of the same age and sex maintained on a low-fat diet; and (2) the influence of [D-Leu-4]-OB3 and MA-[D-Leu-4]-OB3 on glycemic control appears to be independent of their effects on energy balance. These results suggest that [D-Leu-4]-OB3 and/or MA-[D-Leu-4]-OB3 may have application to the management of the majority of cases of common obesity in humans, a state characterized at least in part, by leptin resistance resulting from a defect in leptin transport across the blood-brain barrier. They further suggest that these small molecule synthetic peptide leptin mimetics, through their influence on glycemic control, may prevent the pre-diabetic state associated with most cases of common obesity from escalating into overt type 2 diabetes mellitus.
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Affiliation(s)
- Anke Wang
- Department of Medicine, Division of Endocrinology and Metabolism, Albany Medical College, Albany, NY, 12208, USA
| | - Brian M Anderson
- Department of Medicine, Division of Endocrinology and Metabolism, Albany Medical College, Albany, NY, 12208, USA; Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, NY, 12208, USA
| | - Zachary M Novakovic
- Department of Medicine, Division of Endocrinology and Metabolism, Albany Medical College, Albany, NY, 12208, USA
| | - Patricia Grasso
- Department of Medicine, Division of Endocrinology and Metabolism, Albany Medical College, Albany, NY, 12208, USA; Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, NY, 12208, USA.
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175
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Martins IV, Rivers-Auty J, Allan SM, Lawrence CB. Mitochondrial Abnormalities and Synaptic Loss Underlie Memory Deficits Seen in Mouse Models of Obesity and Alzheimer's Disease. J Alzheimers Dis 2018; 55:915-932. [PMID: 27802235 PMCID: PMC5278950 DOI: 10.3233/jad-160640] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Obesity is associated with impaired memory in humans, and obesity induced by high-fat diets leads to cognitive deficits in rodents and in mouse models of Alzheimer's disease (AD). However, it remains unclear how high-fat diets contribute to memory impairment. Therefore, we tested the effect of a high-fat diet on memory in male and female control non-transgenic (Non-Tg) and triple-transgenic AD (3xTgAD) mice and determined if a high-fat diet caused similar ultrastructural abnormalities to those observed in AD. Behavior was assessed in mice on control or high-fat diet at 4, 8, or 14 months of age and ultrastructural analysis at 8 months of age. A high-fat diet increased body weight, fat weight, and insulin levels with some differences in these metabolic responses observed between Non-Tg and 3xTgAD mice. In both sexes, high-fat feeding caused memory impairments in Non-Tg mice and accelerated memory deficits in 3xTgAD mice. In 3xTgAD mice, changes in hippocampal mitochondrial morphology were observed in capillaries and brain neuropil that were accompanied by a reduction in synapse number. A high-fat diet also caused mitochondria abnormalities and a reduction in synapse number in Non-Tg mice, but did not exacerbate the changes seen in 3xTgAD mice. Our data demonstrate that a high-fat diet affected memory in Non-Tg mice and produced similar impairments in mitochondrial morphology and synapse number comparable to those seen in AD mice, suggesting that the detrimental effects of a high-fat diet on memory might be due to changes in mitochondrial morphology leading to a reduction in synaptic number.
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Affiliation(s)
| | | | | | - Catherine B. Lawrence
- Correspondence to: Catherine B. Lawrence, PhD, Faculty of Life Sciences, A.V. Hill Building, University of Manchester, Oxford Road, Manchester, M13 9PT, UK. Tel.: +44 161 275 5253; E-mail:
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176
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Singh-Manoux A, Dugravot A, Shipley M, Brunner EJ, Elbaz A, Sabia S, Kivimaki M. Obesity trajectories and risk of dementia: 28 years of follow-up in the Whitehall II Study. Alzheimers Dement 2018; 14:178-186. [PMID: 28943197 PMCID: PMC5805839 DOI: 10.1016/j.jalz.2017.06.2637] [Citation(s) in RCA: 219] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 04/25/2017] [Accepted: 06/08/2017] [Indexed: 01/21/2023]
Abstract
INTRODUCTION We examined whether obesity at ages 50, 60, and 70 years is associated with subsequent dementia. Changes in body mass index (BMI) for more than 28 years before dementia diagnosis were compared with changes in BMI in those free of dementia. METHODS A total of 10,308 adults (33% women) aged 35 to 55 years in 1985 were followed up until 2015. BMI was assessed six times and 329 cases of dementia were recorded. RESULTS Obesity (BMI ≥30 kg/m2) at age 50 years (hazard ratio = 1.93; 1.35-2.75) but not at 60 or 70 years was associated with risk of dementia. Trajectories of BMI differed in those with dementia compared with all others (P < .0001) or to matched control subjects (P < .0001) such that BMI in dementia cases was higher from 28 years (P = .001) to 16 years (P = .05) and lower starting 8 years before diagnosis. DISCUSSION Obesity in midlife and weight loss in the preclinical phase characterizes dementia; the current obesity epidemic may affect future dementia rates.
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Affiliation(s)
- Archana Singh-Manoux
- INSERM, U1018, Centre for Research in Epidemiology and Population Health, Villejuif, France; Department of Epidemiology and Public Health, University College London, UK.
| | - Aline Dugravot
- INSERM, U1018, Centre for Research in Epidemiology and Population Health, Villejuif, France
| | - Martin Shipley
- Department of Epidemiology and Public Health, University College London, UK
| | - Eric J Brunner
- Department of Epidemiology and Public Health, University College London, UK
| | - Alexis Elbaz
- INSERM, U1018, Centre for Research in Epidemiology and Population Health, Villejuif, France
| | - Séverine Sabia
- INSERM, U1018, Centre for Research in Epidemiology and Population Health, Villejuif, France; Department of Epidemiology and Public Health, University College London, UK
| | - Mika Kivimaki
- Department of Epidemiology and Public Health, University College London, UK
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177
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Shan G, Bernick C, Banks S. Sample size determination for a matched-pairs study with incomplete data using exact approach. THE BRITISH JOURNAL OF MATHEMATICAL AND STATISTICAL PSYCHOLOGY 2018; 71:60-74. [PMID: 28664985 PMCID: PMC5815835 DOI: 10.1111/bmsp.12107] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 05/16/2017] [Indexed: 06/07/2023]
Abstract
This research was motivated by a clinical trial design for a cognitive study. The pilot study was a matched-pairs design where some data are missing, specifically the missing data coming at the end of the study. Existing approaches to determine sample size are all based on asymptotic approaches (e.g., the generalized estimating equation (GEE) approach). When the sample size in a clinical trial is small to medium, these asymptotic approaches may not be appropriate for use due to the unsatisfactory Type I and II error rates. For this reason, we consider the exact unconditional approach to compute the sample size for a matched-pairs study with incomplete data. Recommendations are made for each possible missingness pattern by comparing the exact sample sizes based on three commonly used test statistics, with the existing sample size calculation based on the GEE approach. An example from a real surgeon-reviewers study is used to illustrate the application of the exact sample size calculation in study designs.
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Affiliation(s)
- Guogen Shan
- Epidemiology and Biostatistics Program, Department of Environmental and Occupational Health School of Community Health Sciences, University of Nevada Las Vegas, Las Vegas, NV 89154
| | - Charles Bernick
- Cleveland Clinic Lou Ruvo Center for Brain Health, 888 W. Bonneville Avenue, Las Vegas, NV 89106
| | - Sarah Banks
- Cleveland Clinic Lou Ruvo Center for Brain Health, 888 W. Bonneville Avenue, Las Vegas, NV 89106
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178
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Hsu DC, Mormino EC, Schultz AP, Amariglio RE, Donovan NJ, Rentz DM, Johnson KA, Sperling RA, Marshall GA. Lower Late-Life Body-Mass Index is Associated with Higher Cortical Amyloid Burden in Clinically Normal Elderly. J Alzheimers Dis 2018; 53:1097-105. [PMID: 27340843 DOI: 10.3233/jad-150987] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
BACKGROUND Lower body-mass index (BMI) in late life has been associated with an increased risk of dementia, and weight loss has been associated with more rapid decline in Alzheimer's disease (AD) dementia. OBJECTIVE To explore the association between BMI and cortical amyloid burden in clinically normal (CN) elderly at risk for AD dementia. METHODS Cross-sectional analyses were completed using baseline data from the Harvard Aging Brain Study, consisting of 280 community-dwelling CN older adults aged 62-90. Assessments included medical histories and physical exam, Pittsburgh compound B (PiB) positron emission tomography (PET) amyloid imaging, and apolipoprotein E ɛ4 (APOE4) genotyping. For the primary analysis, a general linear regression model was used to evaluate the association of BMI with PiB retention. Covariates included age, sex, years of education, and APOE4 carrier status. Secondary analyses were performed for BMI subdivisions (normal, overweight, obese), APOE4 carriers, and BMI×APOE4 interaction. RESULTS In the primary analysis, greater PiB retention was associated with lower BMI (β = -0.14, p = 0.02). In the secondary analyses, APOE4 carrier status (β= -0.27, p = 0.02) and normal BMI (β= -0.25, p = 0.01), as opposed to overweight or obese BMI, were associated with greater PiB retention. The BMI×APOE4 interaction was also significant (β= -0.14, p = 0.04). CONCLUSIONS This finding offers new insight into the role of BMI at the preclinical stage of AD, wherein lower BMI late in life is associated with greater cortical amyloid burden. Future studies are needed to elucidate the mechanism behind this association, especially in those with lower BMI who are APOE4 carriers.
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Affiliation(s)
- David C Hsu
- Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Department of Neurology, Center for Alzheimer Research and Treatment, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.,Department of Psychiatry, Mercy Medical Group, Sacramento, CA, USA
| | - Elizabeth C Mormino
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Aaron P Schultz
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Rebecca E Amariglio
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Department of Neurology, Center for Alzheimer Research and Treatment, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Nancy J Donovan
- Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Department of Neurology, Center for Alzheimer Research and Treatment, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.,Department of Psychiatry, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Dorene M Rentz
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Department of Neurology, Center for Alzheimer Research and Treatment, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.,Department of Psychiatry, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Keith A Johnson
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Department of Neurology, Center for Alzheimer Research and Treatment, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Reisa A Sperling
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Department of Neurology, Center for Alzheimer Research and Treatment, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Gad A Marshall
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Department of Neurology, Center for Alzheimer Research and Treatment, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
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179
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Joo SH, Yun SH, Kang DW, Hahn CT, Lim HK, Lee CU. Body Mass Index in Mild Cognitive Impairment According to Age, Sex, Cognitive Intervention, and Hypertension and Risk of Progression to Alzheimer's Disease. Front Psychiatry 2018; 9:142. [PMID: 29719518 PMCID: PMC5913709 DOI: 10.3389/fpsyt.2018.00142] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 04/03/2018] [Indexed: 12/20/2022] Open
Abstract
Introduction: Mild cognitive impairment (MCI) is a prodromal stage of dementia. The association of body mass index (BMI) and progression to Alzheimer's disease (AD) in MCI subjects according to age, sex, and cognitive intervention remains unknown. We investigated the relationship between BMI and the risk of progression to AD in subjects with MCI, as well as the effect of BMI on progression to AD depending on age, sex, cognitive intervention, and chronic diseases. Methods: Three hundred and eighty-eight MCI subjects were followed for 36.3 ± 18.4 months, prospectively. They underwent neuropsychological testing more than twice during the follow-up period. The MCI subjects were categorized into underweight, normal weight, overweight, and obese subgroups. The associations between baseline BMI and progression to AD over the follow-up period were estimated using Cox proportional hazard regression models. Data were analyzed after stratification by age, sex, cognitive intervention, and chronic diseases. Results: After adjustment for the covariates, the underweight MCI group had a higher risk of progression to AD [hazard ratio (HR): 2.38, 95% confidence interval (CI): 1.17-4.82] relative to the normal weight group. After stratifying by age, sex, cognitive intervention, and chronic diseases, this effect remained significant among females (HR: 3.15, 95% CI: 1.40-7.10), the older elderly ≥75 years old (HR: 3.52, 95% CI: 1.42-8.72), the non-intervention group (HR: 3.06, 95%CI: 1.18-7.91), and the hypertensive group (HR: 4.71, 95% CI: 1.17-18.99). Conclusion: These data indicate that underweight could be a useful marker for identifying individuals at increased risk for AD in MCI subjects. This association is even stronger in females, older elderly subjects, the non-cognitive intervention group, and the hypertensive group.
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Affiliation(s)
- Soo Hyun Joo
- Department of Psychiatry, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Se Hee Yun
- Seocho Center for Dementia, Seoul, South Korea
| | - Dong Woo Kang
- Department of Psychiatry, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Chang Tae Hahn
- Department of Psychiatry, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Hyun Kook Lim
- Department of Psychiatry, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Chang Uk Lee
- Department of Psychiatry, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
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180
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Leptin and ghrelin: Sewing metabolism onto neurodegeneration. Neuropharmacology 2017; 136:307-316. [PMID: 29248481 DOI: 10.1016/j.neuropharm.2017.12.025] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 12/11/2017] [Accepted: 12/13/2017] [Indexed: 12/23/2022]
Abstract
Life expectancy has considerably increased over the last decades. The negative consequence of this augmented longevity has been a dramatic increase of age-related chronic neurodegenerative diseases, such as Alzheimer's, Parkinson's and multiple sclerosis. Epidemiology is telling us there exists a strong correlation between the neuronal loss characterizing these disorders and metabolic dysfunction. This review aims at presenting the evidence supporting the existence of a molecular system linking metabolism with neurodegeneration, with a specific focus on the role of two hormones with a key role in the regulatory cross talk between metabolic imbalance and the damage of nervous system: leptin and ghrelin. This article is part of the Special Issue entitled 'Metabolic Impairment as Risk Factors for Neurodegenerative Disorders.'
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181
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Yaneva-Sirakova T, Traykov L, Petrova J, Gruev I, Vassilev D. Screening for mild cognitive impairment in patients with cardiovascular risk factors. Neuropsychiatr Dis Treat 2017; 13:2925-2934. [PMID: 29255360 PMCID: PMC5722015 DOI: 10.2147/ndt.s144264] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
AIM Cardiovascular risk factors are also risk factors for cognitive impairment. They have cumulative effect in target organ damage. The precise correlation between cardiovascular risk factors and cognitive impairment, as well as assessing the extent to which they may affect cognitive functioning, is difficult to ascertain in everyday clinical practice. Quick, specific, and sensitive neuropsychological tests may be useful in screening for, and the prophylaxis of, target organ damage in hypertensive patients. METHODS We gathered full anamnesis, performed physical examination, laboratory screening and echocardiography. These variables were observed at office and home for all patients, For half of the patients, 24-hour ambulatory blood pressure monitoring and neuropsychological testing using Montreal Cognitive Assessment (MoCA), Mini Mental State Examination (MMSE), Geriatric Depression Scale, and the 4-instrumental activities of daily living scale were undertaken. RESULTS For a period of 2 years, 931 patients were included after applying the inclusion and exclusion criteria. The mean age was 65.90±10.00 years. Two hundred and sixty three patients (85 [32.32%] males and 178 [67.68%] females) were reevaluated after a mean follow-up period of 12 months (6-20 months). The mean results of MoCA and MMSE were significantly lower (p<0.05) in the group of patients with poorly controlled blood pressure and cardiovascular risk factors. There was mild to intermediate negative correlation between Systematic Coronary Risk Evaluation (SCORE) and the neuropsychological tests' results. CONCLUSION Cardiovascular risk factors play an important role for the development of cognitive impairment in the eastern European population because of their high frequency and interaction. The use of easily applicable neuropsychological tests in everyday clinical practice of specialties other than neurology may help in stratifying the risk for development and progression of mild cognitive impairment in this high-risk group.
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Affiliation(s)
| | | | - Julia Petrova
- Department of Neurology, Neurology Clinic, Medical University Sofia
| | - Ivan Gruev
- Cardiology Clinic, National Transport Hospital "Tsar Boris III", Sofia, Bulgaria
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182
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de Oliveira MFB, Yassuda MS, Aprahamian I, Neri AL, Guariento ME. Hypertension, diabetes and obesity are associated with lower cognitive performance in community-dwelling elderly: Data from the FIBRA study. Dement Neuropsychol 2017; 11:398-405. [PMID: 29354220 PMCID: PMC5769998 DOI: 10.1590/1980-57642016dn11-040009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Background Systemic hypertension (SH), diabetes mellitus (DM) and abdominal obesity may negatively impact cognitive performance. Objective To evaluate the association between SH, DM and abdominal obesity and cognitive performance among cognitively unimpaired elderly. Methods A cross-sectional study of individuals aged 65+ from seven Brazilian cities was conducted. SH and DM diagnoses were self-reported and abdominal circumference was objectively measured. Individuals who scored below the education-adjusted cutoff scores on the Mini-Mental State Examination (MMSE) were excluded. Results Among 2,593 elderly, 321 (12.38%) had SH, DM and abdominal obesity concomitantly (Group I) and 421 (16.23%) had none of the three diseases (Group II). Group I had a higher proportion of individuals that were women, aged 70-74 years, illiterate and with lower income. Group I had a higher number of participants with low cognitive performance (28.04% vs. 17.58% in Group II). Variables associated with poor cognitive performance were: female gender (OR: 2.43, p < 0.001); and lower education (OR: 0.410, p < 0.001). The presence of the three diseases and age were not significant in the education-adjusted model. Conclusion There was an association between cognition and the presence of SH, DM and obesity. However, education seems to be decisive in determining cognitive performance in the presence of these three conditions.
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Affiliation(s)
| | - Mônica Sanches Yassuda
- Post-Graduate Program in Gerontology - Faculty of Medical Sciences, State University of Campinas - Unicamp, Campinas, SP, Brazil.,School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
| | - Ivan Aprahamian
- Department of Internal Medicine, Faculty of Medicine of Jundiaí, Jundiaí, SP, Brazil.,Division of Geriatrics, Department of Internal Medicine, Faculty of Medicine, University of São Paulo, São Paulo, Brazil
| | - Anita Liberalesso Neri
- Post-Graduate Program in Gerontology - Faculty of Medical Sciences, State University of Campinas - Unicamp, Campinas, SP, Brazil
| | - Maria Elena Guariento
- Post-Graduate Program in Gerontology - Faculty of Medical Sciences, State University of Campinas - Unicamp, Campinas, SP, Brazil
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183
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McGregor G, Harvey J. Food for thought: Leptin regulation of hippocampal function and its role in Alzheimer's disease. Neuropharmacology 2017; 136:298-306. [PMID: 28987937 DOI: 10.1016/j.neuropharm.2017.09.038] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 09/27/2017] [Accepted: 09/30/2017] [Indexed: 01/08/2023]
Abstract
Accumulating evidence indicates that diet and body weight are important factors associated with Alzheimer's disease (AD), with a significant increase in AD risk linked to mid-life obesity, and weight loss frequently occurring in the early stages of AD. This has fuelled interest in the hormone leptin, as it is an important hypothalamic regulator of food intake and body weight, but leptin also markedly influences the functioning of the hippocampus; a key brain region that degenerates in AD. Increasing evidence indicates that leptin has cognitive enhancing properties as it facilitates the cellular events that underlie hippocampal-dependent learning and memory. However, significant reductions in leptin's capacity to regulate hippocampal synaptic function occurs with age and dysfunctions in the leptin system are associated with an increased risk of AD. Moreover, leptin is a potential novel target in AD as leptin treatment has beneficial effects in various models of AD. Here we summarise recent advances in leptin neurobiology with particular focus on regulation of hippocampal synaptic function by leptin and the implications of this for neurodegenerative disorders like AD. This article is part of the Special Issue entitled 'Metabolic Impairment as Risk Factors for Neurodegenerative Disorders.'
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Affiliation(s)
- Gemma McGregor
- Division of Neuroscience, Ninewells Hospital and Medical School, University of Dundee, Dundee DD1 9SY, United Kingdom
| | - Jenni Harvey
- Division of Neuroscience, Ninewells Hospital and Medical School, University of Dundee, Dundee DD1 9SY, United Kingdom.
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184
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Abstract
The relationship between obesity and cognitive impairment is important given the globally ageing population in whom cognitive decline and neurodegenerative disorders will carry grave individual, societal and financial burdens. This review examines the evidence for the link between obesity and cognitive function in terms of both the immediate effects on cognitive performance, and effects on the trajectory of cognitive ageing and likelihood of dementia. In mid-life, there is a strong association between obesity and impaired cognitive function. Anthropometric measures of obesity are also associated with reduced neural integrity (e.g. grey and white matter atrophy). Increasing age coupled with the negative metabolic consequences of obesity (e.g. type 2 diabetes mellitus) are likely to significantly contribute to cognitive decline and incidence of dementia. Stress is identified as a potential risk factor promoting abdominal obesity and contributing to impaired cognitive function. However, the potentially protective effects of obesity against cognitive decline in older age require further examination. Finally, surgical and whole diet interventions, which address obesity may improve cognitive capacity and confer some protection against later cognitive decline. In conclusion, obesity and its comorbidities are associated with impaired cognitive performance, accelerated cognitive decline and neurodegenerative pathologies such as dementia in later life. Interventions targeting mid-life obesity may prove beneficial in reducing the cognitive risks associated with obesity.
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185
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Mofasser Hossain AKM, Brennan MA, Mason SL, Guo X, Brennan CS. The Combined Effect of Blackcurrant Powder and Wholemeal Flours to Improve Health Promoting Properties of Cookies. PLANT FOODS FOR HUMAN NUTRITION (DORDRECHT, NETHERLANDS) 2017; 72:280-287. [PMID: 28660375 DOI: 10.1007/s11130-017-0619-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A diet with high glycaemic index, which causes rapid spikes in blood sugar level, can lead to disorders such as significantly increased risk for type 2 diabetes, cardiovascular disease and obesity. These conditions are also linked to the progression of cognitive decline and neurodegenerative diseases including Alzheimer's disease. Blackcurrant powder (BC) is a rich source of dietary fibre and bioactive compounds. Wholemeal wheat, barley and oat flours contain high amount of fibre. In this study, a model food (cookie) was developed and used to investigate the in vitro glycaemic glucose equivalent and antioxidant activities of the cookies made with three different wholemeal flours (wheat, barley and oat) with different replacement levels (5, 10 and 15%) of blackcurrant powder. Increasing the proportion of blackcurrant powder in the cookie resulted in a significant (P < 0.05) decrease in glucose release after in vitro digestion compared to the control. In addition, incorporation of blackcurrant powder in cookies up to 15% increased the antioxidant capacity. The combination of wholemeal flour and the bioactive compound rich blackcurrant has the potential to improve the nutritional value and reduce the glycaemic index of such foods.
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Affiliation(s)
- A K M Mofasser Hossain
- Department of Wine, Food and Molecular Biosciences, Lincoln University, Lincoln, New Zealand
| | - Margaret A Brennan
- Department of Wine, Food and Molecular Biosciences, Lincoln University, Lincoln, New Zealand
| | - Susan L Mason
- Department of Wine, Food and Molecular Biosciences, Lincoln University, Lincoln, New Zealand
| | - Xinbo Guo
- School of Food Science and Engineering, South China University of Technology, Guangzhou, China
| | - Charles S Brennan
- Department of Wine, Food and Molecular Biosciences, Lincoln University, Lincoln, New Zealand.
- School of Food Science and Engineering, South China University of Technology, Guangzhou, China.
- Riddet Institute, Palmerston North, New Zealand.
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186
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MacPherson REK. Filling the void: a role for exercise-induced BDNF and brain amyloid precursor protein processing. Am J Physiol Regul Integr Comp Physiol 2017; 313:R585-R593. [PMID: 28814391 DOI: 10.1152/ajpregu.00255.2017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 08/14/2017] [Accepted: 08/14/2017] [Indexed: 01/19/2023]
Abstract
Inactivity, obesity, and insulin resistance are significant risk factors for the development of Alzheimer's disease (AD). Several studies have demonstrated that diet-induced obesity, inactivity, and insulin resistance exacerbate the neuropathological hallmarks of AD. The aggregation of β-amyloid peptides is one of these hallmarks. β-Site amyloid precursor protein-cleaving enzyme 1 (BACE1) is the rate-limiting enzyme in amyloid precursor protein (APP) processing, leading to β-amyloid peptide formation. Understanding how BACE1 content and activity are regulated is essential for establishing therapies aimed at reducing and/or slowing the progression of AD. Exercise training has been proven to reduce the risk of AD as well as decrease β-amyloid production and BACE1 content and/or activity. However, these long-term interventions also result in improvements in adiposity, circulating metabolites, glucose tolerance, and insulin sensitivity making it difficult to determine the direct effects of exercise on brain APP processing. This review highlights this large void in our knowledge and discusses our current understanding of the direct of effect of exercise on β-amyloid production. We have concentrated on the central role that brain-derived neurotrophic factor (BDNF) may play in mediating the direct effects of exercise on reducing brain BACE1 content and activity as well as β-amyloid production. Future studies should aim to generate a greater understanding of how obesity and exercise can directly alter APP processing and AD-related pathologies. This knowledge could provide evidence-based hypotheses for designing therapies to reduce the risk of AD and dementia.
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Shih CC, Yeh CC, Hu CJ, Lane HL, Tsai CC, Chen TL, Liao CC. Risk of dementia in patients with non-haemorrhagic stroke receiving acupuncture treatment: a nationwide matched cohort study from Taiwan's National Health Insurance Research Database. BMJ Open 2017; 7:e013638. [PMID: 28679673 PMCID: PMC5734214 DOI: 10.1136/bmjopen-2016-013638] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To investigate the risk of dementia in patients with stroke who did and did not receive acupuncture treatment. DESIGN Retrospective cohort study. SETTING This study was based on Taiwan's National Health Insurance Research Database that included patients with stroke hospitalised between 1 January 2000 and 31 December 2004. PARTICIPANTS We identified 11 220 patients aged 50 years and older with newly diagnosed stroke hospitalisation. PRIMARY AND SECONDARY OUTCOME MEASURES We compared the incident dementia during the follow-up period until the end of 2009 in patients with stroke who did and did not receive acupuncture. The adjusted HRs and 95% CIs of dementia associated with acupuncture were calculated in multivariate Cox proportional hazard regressions. RESULTS Acupuncture treatment was associated with a decreased risk of dementia with multivariate adjustment (HR, 0.73; 95% CI 0.66 to 0.80), and the association was significant in both sexes and every age group, as well as in groups with ischaemic stroke, with fewer medical conditions and those hospitalised after stroke. Patients with stroke received acupuncture treatment, and conventional rehabilitation was associated with a significantly reduced risk of poststroke dementia (HR, 0.64; 95% CI 0.56 to 0.74). CONCLUSIONS This study raises the possibility that patients with non-haemorrhagic stroke who received acupuncture had a reduced risk of dementia. The results suggest the need for prospective sham-controlled and randomised trials to establish the efficacy of acupuncture in preventing dementia.
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Affiliation(s)
- Chun-Chuan Shih
- School of Chinese Medicine for Post-Baccalaureate, College of Medicine, I-Shou University, Kaohsiung, Taiwan
- Ph.D. Program for Clinical Drug Discovery from Botanical Herbs, Taipei Medical University, Taipei, Taiwan
- Taipei Chinese Medical Association, Taipei, Taiwan
| | - Chun-Chieh Yeh
- Department of Surgery, China Medical University Hospital, Taichung, Taiwan
- Department of Surgery, University of Illinois, Chicago, Illinois, USA
| | - Chaur-Jong Hu
- Department of Neurology, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan
| | - Hsin-Long Lane
- School of Chinese Medicine for Post-Baccalaureate, College of Medicine, I-Shou University, Kaohsiung, Taiwan
| | - Chin-Chuan Tsai
- School of Chinese Medicine for Post-Baccalaureate, College of Medicine, I-Shou University, Kaohsiung, Taiwan
| | - Ta-Liang Chen
- Department of Anesthesiology, Taipei Medical University Hospital, Taipei, Taiwan
- Department of Anesthesiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
- Health Policy Research Center, Taipei Medical University Hospital, Taipei, Taiwan
| | - Chien-Chang Liao
- Department of Anesthesiology, Taipei Medical University Hospital, Taipei, Taiwan
- Department of Anesthesiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
- Health Policy Research Center, Taipei Medical University Hospital, Taipei, Taiwan
- School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan
- Department of Anesthesiology, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan
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188
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Yoon S, Cho H, Kim J, Lee DW, Kim GH, Hong YS, Moon S, Park S, Lee S, Lee S, Bae S, Simonson DC, Lyoo IK. Brain changes in overweight/obese and normal-weight adults with type 2 diabetes mellitus. Diabetologia 2017; 60:1207-1217. [PMID: 28447116 DOI: 10.1007/s00125-017-4266-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 03/01/2017] [Indexed: 01/21/2023]
Abstract
AIMS/HYPOTHESIS Overweight and obesity may significantly worsen glycaemic and metabolic control in type 2 diabetes. However, little is known about the effects of overweight and obesity on the brains of people with type 2 diabetes. Here, we investigate whether the presence of overweight or obesity influences the brain and cognitive functions during early stage type 2 diabetes. METHODS This study attempted to uncouple the effects of overweight/obesity from those of type 2 diabetes on brain structures and cognition. Overweight/obese participants with type 2 diabetes had more severe and progressive abnormalities in their brain structures and cognition during early stage type 2 diabetes compared with participants with normal weight. Relationships between each of these measures and disease duration were also examined. RESULTS Global mean cortical thickness was lower in the overweight/obese type 2 diabetes group than in the normal-weight type 2 diabetes group (z = -2.96, p for group effect = 0.003). A negative correlation was observed between disease duration and global mean white matter integrity (z = 2.42, p for interaction = 0.02) in the overweight/obese type 2 diabetes group, but not in the normal-weight type 2 diabetes group. Overweight/obese individuals with type 2 diabetes showed a decrease in psychomotor speed performance related to disease duration (z = -2.12, p for interaction = 0.03), while normal-weight participants did not. CONCLUSIONS/INTERPRETATION The current study attempted to uncouple the effects of overweight/obesity from those of type 2 diabetes on brain structures and cognition. Overweight/obese participants with type 2 diabetes had more severe and progressive abnormalities in brain structures and cognition during early stage type 2 diabetes compared with normal-weight participants.
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Affiliation(s)
- Sujung Yoon
- Ewha Brain Institute, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, South Korea
- Department of Brain and Cognitive Sciences, Ewha Womans University, Seoul, South Korea
| | - Hanbyul Cho
- The Brain Institute, University of Utah, Salt Lake City, UT, USA
| | - Jungyoon Kim
- Ewha Brain Institute, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, South Korea
- Department of Brain and Cognitive Sciences, Ewha Womans University, Seoul, South Korea
| | - Do-Wan Lee
- Ewha Brain Institute, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, South Korea
| | - Geon Ha Kim
- Ewha Brain Institute, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, South Korea
| | - Young Sun Hong
- Division of Endocrinology & Metabolism, Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, South Korea
| | - Sohyeon Moon
- Ewha Brain Institute, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, South Korea
- Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul, South Korea
| | - Shinwon Park
- Ewha Brain Institute, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, South Korea
- Department of Brain and Cognitive Sciences, Ewha Womans University, Seoul, South Korea
| | - Sunho Lee
- Ewha Brain Institute, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, South Korea
- Interdisciplinary Program in Neurosciences, Seoul National University, Seoul, South Korea
| | - Suji Lee
- Ewha Brain Institute, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, South Korea
- Department of Brain and Cognitive Sciences, Ewha Womans University, Seoul, South Korea
| | - Sujin Bae
- Department of Psychiatry, Chung Ang University Hospital, Seoul, South Korea
| | - Donald C Simonson
- Department of Internal Medicine, Brigham and Women's Hospital, Boston, MA, USA
| | - In Kyoon Lyoo
- Ewha Brain Institute, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, South Korea.
- Department of Brain and Cognitive Sciences, Ewha Womans University, Seoul, South Korea.
- Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul, South Korea.
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189
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Risk factors associated with the onset and progression of Alzheimer’s disease: A systematic review of the evidence. Neurotoxicology 2017; 61:143-187. [DOI: 10.1016/j.neuro.2017.03.006] [Citation(s) in RCA: 162] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 03/22/2017] [Indexed: 12/25/2022]
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190
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Rakesh G, Szabo ST, Alexopoulos GS, Zannas AS. Strategies for dementia prevention: latest evidence and implications. Ther Adv Chronic Dis 2017; 8:121-136. [PMID: 28815009 DOI: 10.1177/2040622317712442] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 04/24/2017] [Indexed: 01/21/2023] Open
Abstract
Dementia is a common and debilitating syndrome with enormous impact on individuals and societies. Preventing disease onset or progression would translate to public health and societal benefits. In this review, we discuss the latest evidence on interventions that may show promise for the prevention of cognitive decline. We appraise existing evidence primarily drawn from randomized controlled trials, systematic reviews, and meta-analyses, but also highlight observational studies in humans and relevant work in model organisms. Overall, there is currently limited evidence to support a cause-effect relationship between any preventive strategy and the development or progression of dementia. However, studies to date suggest that a multifactorial intervention comprising regular exercise and healthy diet, along with the amelioration of vascular risk factors, psychosocial stress, and major depressive episodes may be most promising for the prevention of cognitive decline. We discuss the challenges, future directions, and implications of this line of research.
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Affiliation(s)
- Gopalkumar Rakesh
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
| | - Steven T Szabo
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
| | - George S Alexopoulos
- Department of Psychiatry, Weill Cornell Institute of Geriatric Psychiatry, Weill Cornell Medical College, White Plains, NY, USA
| | - Anthony S Zannas
- Department of Translational Research in Psychiatry, Max Planck Institute of Psychiatry, Kraepelinstrasse 2-10, 80804 Munich, Germany
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191
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Albanese E, Launer LJ, Egger M, Prince MJ, Giannakopoulos P, Wolters FJ, Egan K. Body mass index in midlife and dementia: Systematic review and meta-regression analysis of 589,649 men and women followed in longitudinal studies. ALZHEIMER'S & DEMENTIA: DIAGNOSIS, ASSESSMENT & DISEASE MONITORING 2017; 8:165-178. [PMID: 28761927 PMCID: PMC5520956 DOI: 10.1016/j.dadm.2017.05.007] [Citation(s) in RCA: 147] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
INTRODUCTION We conducted a meta-analysis of the conflicting epidemiologic evidence on the association between midlife body mass index (BMI) and dementia. METHODS We searched standard databases to identify prospective, population-based studies of dementia risk by midlife underweight, overweight, and obesity. We performed random-effects meta-analyses and meta-regressions of adjusted relative risk (RR) estimates and formally explored between-study heterogeneity. RESULTS We included 19 studies on 589,649 participants (2040 incident dementia cases) followed up for up to 42 years. Midlife (age 35 to 65 years) obesity (BMI ≥ 30) (RR, 1.33; 95% confidence interval [CI], 1.08-1.63), but not overweight (25 < BMI < 30) (RR, 1.07; 95% CI, 0.96-1.20), was associated with dementia in late life. The association with midlife underweight (RR, 1.39; 95% CI, 1.13-1.70) was potentially driven by residual confounding (P from meta-regression = .004), selection (P = .046), and information bias (P = .007). DISCUSSION Obesity in midlife increases the risk of dementia. The association between underweight and dementia remains controversial.
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Affiliation(s)
- Emiliano Albanese
- Department of Psychiatry, University of Geneva, Switzerland
- Corresponding author. Tel.: +41-0-793750629; Fax: +41-0-22 372 5754.
| | - Lenore J. Launer
- National Institute on Aging, National Institutes of Health, Bethesda, MD, USA
| | - Matthias Egger
- Institute of Social and Preventive Medicine (ISPM), University of Bern, Switzerland
| | - Martin J. Prince
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK
| | | | - Frank J. Wolters
- Department of Epidemiology, Erasmus MC, Rotterdam, The Netherlands
| | - Kieren Egan
- Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK
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192
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Age-dependent regulation of obesity and Alzheimer-related outcomes by hormone therapy in female 3xTg-AD mice. PLoS One 2017; 12:e0178490. [PMID: 28575011 PMCID: PMC5456100 DOI: 10.1371/journal.pone.0178490] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 05/14/2017] [Indexed: 12/31/2022] Open
Abstract
Depletion of ovarian hormones at menopause is associated with increased Alzheimer's disease (AD) risk. Hormone loss also increases central adiposity, which promotes AD development. One strategy to improve health outcomes in postmenopausal women is estrogen-based hormone therapy (HT), though its efficacy is controversial. The window of opportunity hypothesis posits that HT is beneficial only if initiated near the onset of menopause. Here, we tested this hypothesis by assessing the efficacy of HT against diet-induced obesity and AD-related pathology in female 3xTg-AD mice at early versus late middle-age. HT protected against obesity and reduced β-amyloid burden only at early middle-age. One mechanism that contributes to AD pathogenesis is microglial activation, which is increased by obesity and reduced by estrogens. In parallel to its effects on β-amyloid accumulation, we observed that HT reduced morphological evidence of microglial activation in early but not late middle-age. These findings suggest that HT may be effective during human perimenopause in reducing indices of obesity and AD-related pathology, a conclusion consistent with the window of opportunity hypothesis.
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193
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Birdsill AC, Oleson S, Kaur S, Pasha E, Ireton A, Tanaka H, Haley A. Abdominal obesity and white matter microstructure in midlife. Hum Brain Mapp 2017; 38:3337-3344. [PMID: 28390146 DOI: 10.1002/hbm.23576] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 03/08/2017] [Accepted: 03/09/2017] [Indexed: 12/12/2022] Open
Abstract
The aging U.S. population and the recent rise in the prevalence of obesity are two phenomena of great importance to public health. In addition, research suggests that midlife body mass index (BMI) is a risk factor for dementia, a particularly costly disease, in later life. BMI could influence brain health by adversely impacting cerebral white matter. Recently, greater BMI has been associated with lower white matter fractional anisotropy (FA), an index of tissue microstructure, as measured by diffusion-tensor imaging in midlife. The aim of this study was to investigate the role of abdominal obesity, the most metabolically active adipose tissue compartment, and white matter microstructure in midlife. Community dwelling participants (N = 168) between the ages of 40-62 underwent MRI scanning at 3T and a general health assessment. Inferences were made on whole brain white matter tracts using full-tensor, high-dimension normalization, and tract-based spatial statistics. Higher waist circumference was associated with higher FA, indicating more directional diffusion in several white matter tracts controlling for age, sex, triglycerides, systolic blood pressure, fasting glucose, and HDL-cholesterol. Post hoc analysis revealed that greater waist circumference was associated with lower axial diffusivity, indicating lower parallel diffusion; lower radial diffusivity, indicating lower perpendicular diffusion; and lower mean diffusivity, indicating restricted diffusion. This is the first study to report a positive relationship between obesity and FA, indicating a more complicated view of this relationship in the aging brain. Hum Brain Mapp 38:3337-3344, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Alex Cole Birdsill
- Department of Psychology, The University of Texas at Austin, Austin, Texas
| | - Stephanie Oleson
- Department of Psychology, The University of Texas at Austin, Austin, Texas
| | - Sonya Kaur
- Department of Psychology, The University of Texas at Austin, Austin, Texas
| | - Evan Pasha
- Department of Kinesiology & Health Education, The University of Texas at Austin, Austin, Texas
| | - Adele Ireton
- Department of Psychology, The University of Texas at Austin, Austin, Texas
| | - Hirofumi Tanaka
- Department of Kinesiology & Health Education, The University of Texas at Austin, Austin, Texas
| | - Andreana Haley
- Department of Psychology, The University of Texas at Austin, Austin, Texas
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194
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Current findings on the role of oxytocin in the regulation of food intake. Physiol Behav 2017; 176:31-39. [PMID: 28284882 DOI: 10.1016/j.physbeh.2017.03.007] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 02/17/2017] [Accepted: 03/06/2017] [Indexed: 01/19/2023]
Abstract
In the face of the alarming prevalence of obesity and its associated metabolic impairments, it is of high basic and clinical interest to reach a complete understanding of the central nervous pathways that establish metabolic control. In recent years, the hypothalamic neuropeptide oxytocin, which is primarily known for its involvement in psychosocial processes and reproductive behavior, has received increasing attention as a modulator of metabolic function. Oxytocin administration to the brain of normal-weight animals, but also animals with diet-induced or genetically engineered obesity reduces food intake and body weight, and can also increase energy expenditure. Up to now, only a handful of studies in humans have investigated oxytocin's contribution to the regulation of eating behavior. Relying on the intranasal pathway of oxytocin administration, which is a non-invasive strategy to target central nervous oxytocin receptors, these experiments have yielded some promising first results. In normal-weight and obese individuals, intranasal oxytocin acutely limits meal intake and the consumption of palatable snacks. It is still unclear to which extent - or if at all - such metabolic effects of oxytocin in humans are conveyed or modulated by oxytocin's impact on cognitive processes, in particular on psychosocial function. We shortly summarize the current literature on oxytocin's involvement in food intake and metabolic control, ponder potential links to social and cognitive processes, and address future perspectives as well as limitations of oxytocin administration in experimental and clinical contexts.
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195
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Identification of a fatty acid binding protein4-UCP2 axis regulating microglial mediated neuroinflammation. Mol Cell Neurosci 2017; 80:52-57. [PMID: 28214555 DOI: 10.1016/j.mcn.2017.02.004] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 02/07/2017] [Accepted: 02/13/2017] [Indexed: 12/22/2022] Open
Abstract
Hypothalamic inflammation contributes to metabolic dysregulation and the onset of obesity. Dietary saturated fats activate microglia via a nuclear factor-kappa B (NFκB) mediated pathway to release pro-inflammatory cytokines resulting in dysfunction or death of surrounding neurons. Fatty acid binding proteins (FABPs) are lipid chaperones regulating metabolic and inflammatory pathways in response to fatty acids. Loss of FABP4 in peripheral macrophages via either molecular or pharmacologic mechanisms results in reduced obesity-induced inflammation via a UCP2-redox based mechanism. Despite the widespread appreciation for the role of FABP4 in mediating peripheral inflammation, the expression of FABP4 and a potential FABP4-UCP2 axis regulating microglial inflammatory capacity is largely uncharacterized. To that end, we hypothesized that microglial cells express FABP4 and that inhibition would upregulate UCP2 and attenuate palmitic acid (PA)-induced pro-inflammatory response. Gene expression confirmed expression of FABP4 in brain tissue lysate from C57Bl/6J mice and BV2 microglia. Treatment of microglial cells with an FABP inhibitor (HTS01037) increased expression of Ucp2 and arginase in the presence or absence of PA. Moreover, cells exposed to HTS01037 exhibited attenuated expression of inducible nitric oxide synthase (iNOS) compared to PA alone indicating reduced NFκB signaling. Hypothalamic tissue from mice lacking FABP4 exhibit increased UCP2 expression and reduced iNOS, tumor necrosis factor-alpha (TNF-α), and ionized calcium-binding adapter molecule 1 (Iba1; microglial activation marker) expression compared to wild type mice. Further, this effect is negated in microglia lacking UCP2, indicating the FABP4-UCP2 axis is pivotal in obesity induced neuroinflammation. To our knowledge, this is the first report demonstrating a FABP4-UCP2 axis with the potential to modulate the microglial inflammatory response.
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196
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Shields N, Hussey J, Murphy J, Gormley J, Hoey H. An exploratory study of the association between physical activity, cardiovascular fitness and body size in children with Down syndrome. Dev Neurorehabil 2017; 20:92-98. [PMID: 26366976 DOI: 10.3109/17518423.2015.1077901] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE To explore the association between physical activity, cardiovascular fitness and body size among children with Down syndrome. METHOD Physical activity, cardiovascular fitness and body size were measured by accelerometry, maximal fitness test and anthropometric measurements (BMI, waist circumference), respectively. RESULTS Fourteen children with Down syndrome (8 boys, 6 girls; mean age 12.9 years) participated. There was no significant correlation between physical activity and cardiovascular fitness or physical activity and body size. Children with Down syndrome who were fitter, had lower BMIs (r = -0.77, 95% confidence interval (CI) -0.41 to -0.93) and smaller waist circumference (r = -0.75, 95% CI -0.36 to -0.92). CONCLUSION Preliminary evidence suggests physical activity may not be associated with either body size or fitness in children with Down syndrome. Body size appears to be inversely related to fitness in children with Down syndrome.
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Affiliation(s)
- Nora Shields
- a School of Allied Health, La Trobe University , Melbourne , Victoria , Australia.,b Northern Health , Epping , Victoria , Australia
| | - Juliette Hussey
- c Division of Physiotherapy , Trinity College Dublin , Dublin , Ireland , and
| | - Joan Murphy
- d Department of Paediatrics , Trinity College Dublin , Dublin , Ireland
| | - John Gormley
- c Division of Physiotherapy , Trinity College Dublin , Dublin , Ireland , and
| | - Hilary Hoey
- d Department of Paediatrics , Trinity College Dublin , Dublin , Ireland
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197
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Müller J, Chan K, Myers JN. Association Between Exercise Capacity and Late Onset of Dementia, Alzheimer Disease, and Cognitive Impairment. Mayo Clin Proc 2017; 92:211-217. [PMID: 28082018 DOI: 10.1016/j.mayocp.2016.10.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 10/19/2016] [Indexed: 12/13/2022]
Abstract
OBJECTIVE To address the association between exercise capacity and the onset of dementia, Alzheimer disease, and cognitive impairment. PATIENTS AND METHODS For 6104 consecutive veteran patients (mean ± SD age: 59.2±11.4 years) referred for treadmill exercise testing, the combined end point of dementia, Alzheimer disease, and cognitive impairment was abstracted from the Veterans Affairs computerized patient record system. RESULTS After mean ± SD follow-up of 10.3±5.5 years, 353 patients (5.8%) developed the composite end point at a mean ± SD age of 76.7±10.3 years. After correction for confounders in multivariate Cox proportional hazards regression, higher age at exercise testing (hazard ratio [HR]=1.08; 95% CI, 1.07-1.09; P<.001), current smoking (HR=1.44; 95% CI, 1.08-1.93; P=.01), and exercise capacity (HR=0.92; 95% CI, 0.89-0.96; P<.001) emerged as predictors of cognitive impairment. Each 1-metabolic equivalent increase in exercise capacity conferred a nearly 8% reduction in the incidence of cognitive impairment. Meeting the recommendations for daily activity was not associated with a delay in onset of cognitive impairment (HR=1.07; 95% CI, 0.86-1.32; P=.55). CONCLUSION Exercise capacity is strongly associated with cognitive function; the inverse association between fitness and cognitive impairment provides an additional impetus for health care providers to promote physical activity.
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Affiliation(s)
- Jan Müller
- Institute of Preventive Pediatrics, Technische Universität München, München, Germany; Division of Cardiology, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA; Stanford University School of Medicine, Stanford, CA.
| | - Khin Chan
- Division of Cardiology, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA
| | - Jonathan N Myers
- Division of Cardiology, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA; Stanford University School of Medicine, Stanford, CA
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High BMI levels associate with reduced mRNA expression of IL10 and increased mRNA expression of iNOS (NOS2) in human frontal cortex. Transl Psychiatry 2017; 7:e1044. [PMID: 28244985 PMCID: PMC5545642 DOI: 10.1038/tp.2016.259] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 10/16/2016] [Accepted: 10/31/2016] [Indexed: 12/22/2022] Open
Abstract
Several studies link increasing body mass index (BMI) to cognitive decline both as a consequence of obesity per se and as a sequela of obesity-induced type 2 diabetes. Obese individuals are prone to a chronic low-grade inflammation as the metabolically active visceral fat produces proinflammatory cytokines. Animal studies indicate that these cytokines can cross the blood-brain barrier. Such crossover could potentially affect the immune system in the brain by inducing gene expression of proinflammatory genes. The relationship between obesity and neuroinflammation in the human brain is currently unknown. Therefore we aim to examine the relationship between BMI and gene expression of central inflammatory markers in the human frontal cortex. Microarray data of 141 neurologically and psychiatrically healthy individuals were obtained through the BrainCloud database. A simple linear regression analysis was performed with BMI as variable on data on IL10, IL1β, IL6, PTGS2 (COX2) and NOS2 (iNOS). Increasing BMI is associated with a decrease in the mRNA expression of IL10 (P=0.014) and an increase in the expression of NOS2 (iNOS; P=0.040). Expressions of IL10 and NOS2 (iNOS) were negatively correlated (P<0.001). The expression of IL10 was mostly affected by individuals with BMI ⩾40. Multiple linear regression analyses with BMI, age, sex and race as variables were performed in order to identify potential confounders. In conclusion, increasing BMI could affect the IL10-mediated anti-inflammatory defense in the brain and induce iNOS-mediated inflammatory activity.
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Veronese N, Facchini S, Stubbs B, Luchini C, Solmi M, Manzato E, Sergi G, Maggi S, Cosco T, Fontana L. Weight loss is associated with improvements in cognitive function among overweight and obese people: A systematic review and meta-analysis. Neurosci Biobehav Rev 2017; 72:87-94. [DOI: 10.1016/j.neubiorev.2016.11.017] [Citation(s) in RCA: 123] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 11/14/2016] [Accepted: 11/19/2016] [Indexed: 12/11/2022]
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Abstract
OBJECTIVE The aim of the study was to determine the relationship of lifestyle factors and neurocognitive functioning in older adults with vascular risk factors and cognitive impairment, no dementia (CIND). METHODS One hundred sixty adults (M [SD] = 65.4 [6.8] years) with CIND completed neurocognitive assessments of executive function, processing speed, and memory. Objective measures of physical activity using accelerometry, aerobic capacity determined by exercise testing, and dietary habits quantified by the Food Frequency Questionnaire and 4-Day Food Diary to assess adherence to the Mediterranean and Dietary Approaches to Stop Hypertension (DASH) diets were obtained to assess direct effects with neurocognition. Potential indirect associations of high-sensitivity C-reactive protein and the Framingham Stroke Risk Profile also were examined. RESULTS Greater aerobic capacity (β = 0.24) and daily physical activity (β = 0.15) were associated with better executive functioning/processing speed and verbal memory (βs = 0.24; 0.16). Adherence to the DASH diet was associated with better verbal memory (β = 0.17). Greater high-sensitivity C-reactive protein (βs = -0.14; -0.21) and Framingham Stroke Risk Profile (β = -0.18; -0.18) were associated with poorer executive functioning/processing speed and verbal memory. Greater stroke risk partially mediated the association of aerobic capacity with executive functioning/processing speed, and verbal memory and greater inflammation partially mediated the association of physical activity and aerobic fitness, with verbal memory. CONCLUSIONS Higher levels of physical activity, aerobic fitness, and adherence to the DASH diet are associated with better neurocognitive performance in adults with CIND. These findings suggest that the adoption of healthy lifestyle habits could reduce the risk of neurocognitive decline in vulnerable older adults. CLINICAL TRIAL REGISTRATION NCT01573546.
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