LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 9 of total 9

Search options

  1. Article ; Online: Therapeutic Potential of Glucagon-Like Peptide-1 Cleavage Product for Alzheimer's Disease.

    Day, Stephen M / Ma, Tao

    Neuroscience bulletin

    2019  Volume 35, Issue 5, Page(s) 934–936

    MeSH term(s) Alzheimer Disease/drug therapy ; Animals ; Glucagon-Like Peptide 1/analogs & derivatives ; Glucagon-Like Peptide 1/physiology ; Glucagon-Like Peptide 1/therapeutic use ; Humans
    Chemical Substances glucagon-like peptide-1 (9-36)-amide ; Glucagon-Like Peptide 1 (89750-14-1)
    Language English
    Publishing date 2019-03-07
    Publishing country Singapore
    Document type Journal Article ; Review
    ZDB-ID 2419741-5
    ISSN 1995-8218 ; 1673-7067
    ISSN (online) 1995-8218
    ISSN 1673-7067
    DOI 10.1007/s12264-019-00355-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article: Social inequalities in health in nonhuman primates.

    Shively, Carol A / Day, Stephen M

    Neurobiology of stress

    2014  Volume 1, Page(s) 156–163

    Abstract: Overall health has been linked to socioeconomic status, with the gap between social strata increasing each year. Studying the impact of social position on health and biological functioning in nonhuman primates has allowed researchers to model the human ... ...

    Abstract Overall health has been linked to socioeconomic status, with the gap between social strata increasing each year. Studying the impact of social position on health and biological functioning in nonhuman primates has allowed researchers to model the human condition while avoiding ethical complexities or other difficulties characteristic of human studies. Using female cynomolgus macaques (Macaca fascicularis), our lab has examined the link between social status and stress for 30 years. Female nonhuman primates are especially sensitive to social stressors which can deleteriously affect reproductive health, leading to harmful consequences to their overall health. Subordinates have lower progesterone concentrations during the luteal phase of menstrual cycle, which is indicative of absence or impairment of ovulation. Subordinate animals receive more aggression, less affiliative attention, and are more likely to exhibit depressive behaviors. They also express higher stress-related biomarkers such as increased heart rates and lower mean cortisol. While no differences in body weight between dominant and subordinate animals are observed, subordinates have lower bone density and more visceral fat than their dominant counterparts. The latter increases risk for developing inflammatory diseases. Differences are also observed in neurological and autonomic function. A growing body of data suggests that diet composition may amplify or diminish physiological stress responses which have deleterious effects on health. More experimental investigation of the health effects of diet pattern is needed to further elucidate these differences in an ongoing search to find realistic and long-term solutions to the declining health of individuals living across the ever widening socioeconomic spectrum.
    Language English
    Publishing date 2014-11-20
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2816500-7
    ISSN 2352-2895
    ISSN 2352-2895
    DOI 10.1016/j.ynstr.2014.11.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Ethanol exposure alters Alzheimer's-related pathology, behavior, and metabolism in APP/PS1 mice.

    Day, Stephen M / Gironda, Stephen C / Clarke, Caitlin W / Snipes, J Andy / Nicol, Noelle I / Kamran, Hana / Vaughan, Warner / Weiner, Jeffrey L / Macauley, Shannon L

    Neurobiology of disease

    2022  Volume 177, Page(s) 105967

    Abstract: Epidemiological studies identified alcohol use disorder (AUD) as a risk factor for Alzheimer's disease (AD), yet there is conflicting evidence on how alcohol use promotes AD pathology. In this study, a 10-week moderate two-bottle choice drinking paradigm ...

    Abstract Epidemiological studies identified alcohol use disorder (AUD) as a risk factor for Alzheimer's disease (AD), yet there is conflicting evidence on how alcohol use promotes AD pathology. In this study, a 10-week moderate two-bottle choice drinking paradigm was used to identify how chronic ethanol exposure alters amyloid-β (Aβ)-related pathology, metabolism, and behavior. Ethanol-exposed APPswe/PSEN1dE9 (APP/PS1) mice showed increased brain atrophy and an increased number of amyloid plaques. Further analysis revealed that ethanol exposure led to a shift in the distribution of plaque size in the cortex and hippocampus. Ethanol-exposed mice developed a greater number of smaller plaques, potentially setting the stage for increased plaque proliferation in later life. Ethanol drinking APP/PS1 mice also exhibited deficits in nest building, a metric of self-care, as well as increased locomotor activity and central zone exploration in an open field test. Ethanol exposure also led to a diurnal shift in feeding behavior which was associated with changes in glucose homeostasis and glucose intolerance. Complementary in vivo microdialysis experiments were used to measure how acute ethanol directly modulates Aβ in the hippocampal interstitial fluid (ISF). Acute ethanol transiently increased hippocampal ISF glucose levels, suggesting that ethanol directly affects cerebral metabolism. Acute ethanol also selectively increased ISF Aβ40, but not ISF Aβ42, levels during withdrawal. Lastly, chronic ethanol drinking increased N-methyl-d-aspartate receptor (NMDAR) and decreased γ-aminobutyric acid type-A receptor (GABA
    MeSH term(s) Animals ; Mice ; Alzheimer Disease/metabolism ; Amyloid beta-Peptides/metabolism ; Amyloid beta-Protein Precursor/genetics ; Amyloid beta-Protein Precursor/metabolism ; Disease Models, Animal ; Ethanol/toxicity ; Glucose/metabolism ; Hippocampus/metabolism ; Mice, Transgenic ; Plaque, Amyloid/metabolism ; Presenilin-1/genetics ; Presenilin-1/metabolism
    Chemical Substances Amyloid beta-Peptides ; Amyloid beta-Protein Precursor ; Ethanol (3K9958V90M) ; Glucose (IY9XDZ35W2) ; Presenilin-1 ; APP protein, mouse
    Language English
    Publishing date 2022-12-16
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 1211786-9
    ISSN 1095-953X ; 0969-9961
    ISSN (online) 1095-953X
    ISSN 0969-9961
    DOI 10.1016/j.nbd.2022.105967
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article: Type-2-Diabetes Alters CSF but Not Plasma Metabolomic and AD Risk Profiles in Vervet Monkeys.

    Kavanagh, Kylie / Day, Stephen M / Pait, Morgan C / Mortiz, William R / Newgard, Christopher B / Ilkayeva, Olga / Mcclain, Donald A / Macauley, Shannon L

    Frontiers in neuroscience

    2019  Volume 13, Page(s) 843

    Abstract: Epidemiological studies suggest that individuals with type 2 diabetes (T2D) have a twofold to fourfold increased risk for developing Alzheimer's disease (AD), however, the exact mechanisms linking the two diseases are unknown. In both conditions, the ... ...

    Abstract Epidemiological studies suggest that individuals with type 2 diabetes (T2D) have a twofold to fourfold increased risk for developing Alzheimer's disease (AD), however, the exact mechanisms linking the two diseases are unknown. In both conditions, the majority of pathophysiological changes, including glucose and insulin dysregulation, insulin resistance, and AD-related changes in Aβ and tau, occur decades before the onset of clinical symptoms and diagnosis. In this study, we investigated the relationship between metabolic biomarkers associated with T2D and amyloid pathology including Aβ levels, from cerebrospinal fluid (CSF) and fasting plasma of healthy, pre-diabetic (PreD), and T2D vervet monkeys (
    Language English
    Publishing date 2019-08-28
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2411902-7
    ISSN 1662-453X ; 1662-4548
    ISSN (online) 1662-453X
    ISSN 1662-4548
    DOI 10.3389/fnins.2019.00843
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Glucagon-Like Peptide-1 Cleavage Product Improves Cognitive Function in a Mouse Model of Down Syndrome.

    Day, Stephen M / Yang, Wenzhong / Wang, Xin / Stern, Jennifer E / Zhou, Xueyan / Macauley, Shannon L / Ma, Tao

    eNeuro

    2019  Volume 6, Issue 2

    Abstract: Currently there is no effective therapy available for cognitive impairments in Down syndrome (DS), one of the most prevalent forms of intellectual disability in humans associated with the chromosomes 21 trisomy. Glucagon-like peptide-1 (GLP-1) is an ... ...

    Abstract Currently there is no effective therapy available for cognitive impairments in Down syndrome (DS), one of the most prevalent forms of intellectual disability in humans associated with the chromosomes 21 trisomy. Glucagon-like peptide-1 (GLP-1) is an incretin hormone that maintains glucose homeostasis by stimulating insulin secretion. Its natural cleavage product GLP-1 (9-36) lacks insulinotropic effects and has a low binding affinity for GLP-1 receptors; thus, GLP-1 (9-36) has historically been identified as an inactive metabolite. Conversely, recent work has demonstrated interesting physiological properties of GLP-1 (9-36) such as cardioprotection and neuroprotection. We have previously shown that GLP-1 (9-36) administration enhances neuronal plasticity in young WT mice and ameliorates cognitive deficits in a mouse model of Alzheimer's disease. Here, we report that systemic administration of GLP-1 (9-36) in Ts65Dn DS model mice of either sex resulted in decreased mitochondrial oxidative stress in hippocampus and improved dendritic spine morphology, increase of mature spines and reduction of immature spines. Importantly, these molecular alterations translated into functional changes in that long-term potentiation failure and cognitive impairments in TsDn65 DS model mice were rescued with GLP-1 (9-36) treatment. We also show that chronic GLP-1 (9-36) treatment did not alter glucose tolerance in either WT or DS model mice. Our findings suggest that GLP-1 (9-36) treatment may have therapeutic potential for DS and other neurodegenerative diseases associated with increased neuronal oxidative stress.
    MeSH term(s) Animals ; Avoidance Learning/drug effects ; Behavior, Animal/drug effects ; Cognitive Dysfunction/drug therapy ; Dendritic Spines/drug effects ; Disease Models, Animal ; Down Syndrome/drug therapy ; Female ; Glucagon-Like Peptide 1/administration & dosage ; Glucagon-Like Peptide 1/analogs & derivatives ; Glucagon-Like Peptide 1/pharmacology ; Glucose Tolerance Test ; Hippocampus/drug effects ; Long-Term Potentiation/drug effects ; Male ; Mice ; Mice, Transgenic ; Neuronal Plasticity/drug effects ; Nootropic Agents/administration & dosage ; Nootropic Agents/pharmacology ; Oxidative Stress/drug effects ; Spatial Memory/drug effects
    Chemical Substances Nootropic Agents ; glucagon-like peptide-1 (9-36)-amide ; Glucagon-Like Peptide 1 (89750-14-1)
    Language English
    Publishing date 2019-05-15
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2800598-3
    ISSN 2373-2822 ; 2373-2822
    ISSN (online) 2373-2822
    ISSN 2373-2822
    DOI 10.1523/ENEURO.0031-19.2019
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: A nonhuman primate model of human non-suicidal self-injury: serotonin-transporter genotype-mediated typologies.

    Wood, Elizabeth K / Kruger, Ryno / Day, Jaclyn P / Day, Stephen M / Hunter, Jacob N / Neville, Leslie / Lindell, Stephen G / Barr, Christina S / Schwandt, Melanie L / Goldman, David / Suomi, Stephen J / Harris, James C / Higley, J Dee

    Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology

    2021  Volume 47, Issue 6, Page(s) 1256–1262

    Abstract: While non-suicidal self-injury (NSSI) occurs in the general population at a surprisingly high rate, with higher rates among certain clinical  populations, its etiology is not well-understood. Consequently, the DSM-5 lists NSSI as requiring further ... ...

    Abstract While non-suicidal self-injury (NSSI) occurs in the general population at a surprisingly high rate, with higher rates among certain clinical  populations, its etiology is not well-understood. Consequently, the DSM-5 lists NSSI as requiring further research. This study utilizes a translational model of naturally-occurring NSSI to assess the role of early parental neglect and variation in the serotonin transporter genotype (5-HTT) in the etiology of NSSI. Subjects (N = 161) were rhesus macaques (Macaca mulatta) reared in one of three conditions (mother-reared (MR), peer-reared (PR), or surrogate peer-reared (SPR)), and classified as NSSI (n = 18) or non-NSSI (n = 143). Subjects were genotyped for 5-HTT and their behaviors were recorded during an ecologically-meaningful, stress-evoking, intruder paradigm. Two weeks prior to testing, blood samples were obtained and assayed for plasma cortisol and adrenocorticotropic hormone (ACTH) concentrations. NSSI subjects were more likely to be SPR, paralleling human studies showing that individuals that exhibit NSSI tend to have experienced abuse or neglect early in life. Results also indicated that variation in the 5-HTT genotype differentiated the NSSI subjects. NSSI subjects that were homozygous for the L allele exhibited high plasma ACTH and high rates of stress-induced stereotypies; whereas NSSI subjects with the s allele exhibited impulsive behaviors, including frequently approaching the potentially dangerous intruder, high rates of aggressive vocal threats, and more activity. These results suggest that there may be different 5-HTT genotype-mediated NSSI typologies and that both early experiences and variation in the 5-HTT genotype may be important factors in understanding the etiology of NSSI.
    MeSH term(s) Adrenocorticotropic Hormone ; Animals ; Genotype ; Humans ; Macaca mulatta/genetics ; Self-Injurious Behavior/genetics ; Serotonin ; Serotonin Plasma Membrane Transport Proteins/genetics
    Chemical Substances Serotonin Plasma Membrane Transport Proteins ; Serotonin (333DO1RDJY) ; Adrenocorticotropic Hormone (9002-60-2)
    Language English
    Publishing date 2021-04-14
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Intramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 639471-1
    ISSN 1740-634X ; 0893-133X
    ISSN (online) 1740-634X
    ISSN 0893-133X
    DOI 10.1038/s41386-021-00994-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Glucagon-like peptide-1 cleavage product GLP-1 (9-36) amide enhances hippocampal long-term synaptic plasticity in correlation with suppression of Kv4.2 expression and eEF2 phosphorylation.

    Day, Stephen M / Yang, Wenzhong / Ewin, Sarah / Zhou, Xueyan / Ma, Tao

    Hippocampus

    2017  Volume 27, Issue 12, Page(s) 1264–1274

    Abstract: Glucagon-like peptide-1 (GLP-1) is an endogenous gut hormone and a key regulator in maintaining glucose homeostasis by stimulating insulin secretion. Its natural cleavage product GLP-1 (9-36), used to be considered a "bio-inactive" metabolite mainly ... ...

    Abstract Glucagon-like peptide-1 (GLP-1) is an endogenous gut hormone and a key regulator in maintaining glucose homeostasis by stimulating insulin secretion. Its natural cleavage product GLP-1 (9-36), used to be considered a "bio-inactive" metabolite mainly because of its lack of insulinotropic effects and low affinity for GLP-1 receptors, possesses unique properties such as anti-oxidant and cardiovascular protection. Little is known about the role of GLP-1 (9-36) in central nervous system. Here we report that chronic, systemic application of GLP-1 (9-36) in adult mice facilitated both the induction and maintenance phases of hippocampal long-term potentiation (LTP), a major form of synaptic plasticity. In contrast, spatial learning and memory, as assessed by the Morris water maze test, was not altered by GLP-1 (9-36) administration. At the molecular level, GLP-1 (9-36) reduced protein levels of the potassium channel Kv4.2 in hippocampus, which is linked to elevated dendritic membrane excitability. Moreover, GLP-1(9-36) treatment inhibited phosphorylation of mRNA translational factor eEF2, which is associated with increased capacity for de novo protein synthesis. Finally, we showed that the LTP-enhancing effects by GLP-1 (9-36) treatment in vivo were blunted by application of exendin(9-39)amide [EX(9-39)], the GLP-1 receptor (GLP-1R) antagonist, suggesting its role as a GLP-1R agonist. These findings demonstrate that GLP-1 (9-36), which was considered a "bio-inactive" peptide, clearly exerts physiological effects on neuronal plasticity in the hippocampus, a brain region critical for learning and memory.
    MeSH term(s) Animals ; Blotting, Western ; Central Nervous System Agents/administration & dosage ; Female ; Glucagon-Like Peptide 1/administration & dosage ; Glucagon-Like Peptide 1/analogs & derivatives ; Glucagon-Like Peptide 1/metabolism ; Glucagon-Like Peptide-1 Receptor/antagonists & inhibitors ; Glucagon-Like Peptide-1 Receptor/metabolism ; Hippocampus/drug effects ; Hippocampus/metabolism ; Long-Term Potentiation/drug effects ; Long-Term Potentiation/physiology ; Male ; Maze Learning/drug effects ; Maze Learning/physiology ; Mechanistic Target of Rapamycin Complex 1/metabolism ; Mice, Inbred C57BL ; Peptides/administration & dosage ; Peptides/metabolism ; Phosphorylation/drug effects ; Phosphorylation/physiology ; Protein-Serine-Threonine Kinases/metabolism ; Shal Potassium Channels/metabolism ; Spatial Memory/drug effects ; Spatial Memory/physiology ; Tissue Culture Techniques
    Chemical Substances Central Nervous System Agents ; Glucagon-Like Peptide-1 Receptor ; Peptides ; Shal Potassium Channels ; glucagon-like peptide-1 (9-36)-amide ; Glucagon-Like Peptide 1 (89750-14-1) ; Mechanistic Target of Rapamycin Complex 1 (EC 2.7.11.1) ; Protein-Serine-Threonine Kinases (EC 2.7.11.1) ; eIF2alpha kinase, mouse (EC 2.7.11.1)
    Language English
    Publishing date 2017-08-30
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1074352-2
    ISSN 1098-1063 ; 1050-9631
    ISSN (online) 1098-1063
    ISSN 1050-9631
    DOI 10.1002/hipo.22795
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: KATP channels are necessary for glucose-dependent increases in amyloid-β and Alzheimer's disease-related pathology.

    Grizzanti, John / Moritz, William R / Pait, Morgan C / Stanley, Molly / Kaye, Sarah D / Carroll, Caitlin M / Constantino, Nicholas J / Deitelzweig, Lily J / Snipes, James A / Kellar, Derek / Caesar, Emily E / Pettit-Mee, Ryan J / Day, Stephen M / Sens, Jonathon P / Nicol, Noelle I / Dhillon, Jasmeen / Remedi, Maria S / Kiraly, Drew D / Karch, Celeste M /
    Nichols, Colin G / Holtzman, David M / Macauley, Shannon L

    JCI insight

    2023  Volume 8, Issue 10

    Abstract: Elevated blood glucose levels, or hyperglycemia, can increase brain excitability and amyloid-β (Aβ) release, offering a mechanistic link between type 2 diabetes and Alzheimer's disease (AD). Since the cellular mechanisms governing this relationship are ... ...

    Abstract Elevated blood glucose levels, or hyperglycemia, can increase brain excitability and amyloid-β (Aβ) release, offering a mechanistic link between type 2 diabetes and Alzheimer's disease (AD). Since the cellular mechanisms governing this relationship are poorly understood, we explored whether ATP-sensitive potassium (KATP) channels, which couple changes in energy availability with cellular excitability, play a role in AD pathogenesis. First, we demonstrate that KATP channel subunits Kir6.2/KCNJ11 and SUR1/ABCC8 were expressed on excitatory and inhibitory neurons in the human brain, and cortical expression of KCNJ11 and ABCC8 changed with AD pathology in humans and mice. Next, we explored whether eliminating neuronal KATP channel activity uncoupled the relationship between metabolism, excitability, and Aβ pathology in a potentially novel mouse model of cerebral amyloidosis and neuronal KATP channel ablation (i.e., amyloid precursor protein [APP]/PS1 Kir6.2-/- mouse). Using both acute and chronic paradigms, we demonstrate that Kir6.2-KATP channels are metabolic sensors that regulate hyperglycemia-dependent increases in interstitial fluid levels of Aβ, amyloidogenic processing of APP, and amyloid plaque formation, which may be dependent on lactate release. These studies identify a potentially new role for Kir6.2-KATP channels in AD and suggest that pharmacological manipulation of Kir6.2-KATP channels holds therapeutic promise in reducing Aβ pathology in patients with diabetes or prediabetes.
    MeSH term(s) Humans ; Mice ; Animals ; KATP Channels/metabolism ; Alzheimer Disease/pathology ; Diabetes Mellitus, Type 2/complications ; Glucose ; Amyloid beta-Peptides/metabolism ; Amyloid beta-Protein Precursor/metabolism ; Hyperglycemia
    Chemical Substances KATP Channels ; Glucose (IY9XDZ35W2) ; Amyloid beta-Peptides ; Amyloid beta-Protein Precursor
    Language English
    Publishing date 2023-05-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ISSN 2379-3708
    ISSN (online) 2379-3708
    DOI 10.1172/jci.insight.162454
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article: Mediterranean diet, stress resilience, and aging in nonhuman primates.

    Shively, Carol A / Appt, Susan E / Chen, Haiying / Day, Stephen M / Frye, Brett M / Shaltout, Hossam A / Silverstein-Metzler, Marnie G / Snyder-Mackler, Noah / Uberseder, Beth / Vitolins, Mara Z / Register, Thomas C

    Neurobiology of stress

    2020  Volume 13, Page(s) 100254

    Abstract: Persistent psychological stress increases the risk of many chronic diseases of aging. Little progress has been made to effectively reduce stress responses or mitigate stress effects suggesting a need for better understanding of factors that influence ... ...

    Abstract Persistent psychological stress increases the risk of many chronic diseases of aging. Little progress has been made to effectively reduce stress responses or mitigate stress effects suggesting a need for better understanding of factors that influence stress responses. Limited evidence suggests that diet may be a factor in modifying the effects of stress. However, long-term studies of diet effects on stress reactive systems are not available, and controlled randomized clinical trials are difficult and costly. Here we report the outcomes of a controlled, randomized preclinical trial of the effects of long-term consumption (31 months, ~ equivalent to 9 human years) of Western versus Mediterranean - like diets on behavioral and physiological responses to acute (brief social separation) and chronic (social subordination) psychosocial stress in 38 adult, socially-housed, female cynomolgus macaques. Compared to animals fed a Western diet, those fed the Mediterranean diet exhibited enhanced stress resilience as indicated by lower sympathetic activity, brisker and more overt heart rate responses to acute stress, more rapid recovery, and lower cortisol responses to acute psychological stress and adrenocorticotropin (ACTH) challenge. Furthermore, age-related increases in sympathetic activity and cortisol responses to stress were delayed by the Mediterranean diet. Population level diet modification in humans has been shown to be feasible. Our findings suggest that population-wide adoption of a Mediterranean-like diet pattern may provide a cost-effective intervention on psychological stress and promote healthy aging with the potential for widespread efficacy.
    Language English
    Publishing date 2020-10-19
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2816500-7
    ISSN 2352-2895
    ISSN 2352-2895
    DOI 10.1016/j.ynstr.2020.100254
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top