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https://www.readbyqxmd.com/read/28103298/perinatal-choline-supplementation-reduces-amyloidosis-and-increases-choline-acetyltransferase-expression-in-the-hippocampus-of-the-appsweps1de9-alzheimer-s-disease-model-mice
#1
Tiffany J Mellott, Olivia M Huleatt, Bethany N Shade, Sarah M Pender, Yi B Liu, Barbara E Slack, Jan K Blusztajn
Prevention of Alzheimer's disease (AD) is a major goal of biomedical sciences. In previous studies we showed that high intake of the essential nutrient, choline, during gestation prevented age-related memory decline in a rat model. In this study we investigated the effects of a similar treatment on AD-related phenotypes in a mouse model of AD. We crossed wild type (WT) female mice with hemizygous APPswe/PS1dE9 (APP.PS1) AD model male mice and maintained the pregnant and lactating dams on a control AIN76A diet containing 1...
2017: PloS One
https://www.readbyqxmd.com/read/28102934/crosstalk-between-angiotensin-and-the-non-amyloidogenic-pathway-of-alzheimer-s-amyloid-precursor-protein
#2
Anna Maria Kanarek, Annika Wagner, Jim Küppers, Michael Gütschow, Rolf Postina, Elzbieta Kojro
The association between hypertension and an increased risk for Alzheimer's disease (AD) and dementia is well established. Many data suggest that modulation of the renin-angiotensin system may be meaningful for the prevention and therapy of neurodegenerative disorders, in particular AD. Proteolytic cleavage of the amyloid precursor protein (APP) by α-secretase precludes formation of neurotoxic Aβ peptides and is expected to counteract the development of AD. An established approach for the up-regulation of α-secretase cleavage is activation of G protein-coupled receptors (GPCRs)...
January 19, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28099414/neurotoxic-reactive-astrocytes-are-induced-by-activated-microglia
#3
Shane A Liddelow, Kevin A Guttenplan, Laura E Clarke, Frederick C Bennett, Christopher J Bohlen, Lucas Schirmer, Mariko L Bennett, Alexandra E Münch, Won-Suk Chung, Todd C Peterson, Daniel K Wilton, Arnaud Frouin, Brooke A Napier, Nikhil Panicker, Manoj Kumar, Marion S Buckwalter, David H Rowitch, Valina L Dawson, Ted M Dawson, Beth Stevens, Ben A Barres
Reactive astrocytes are strongly induced by central nervous system (CNS) injury and disease, but their role is poorly understood. Here we show that a subtype of reactive astrocytes, which we termed A1, is induced by classically activated neuroinflammatory microglia. We show that activated microglia induce A1 astrocytes by secreting Il-1α, TNF and C1q, and that these cytokines together are necessary and sufficient to induce A1 astrocytes. A1 astrocytes lose the ability to promote neuronal survival, outgrowth, synaptogenesis and phagocytosis, and induce the death of neurons and oligodendrocytes...
January 18, 2017: Nature
https://www.readbyqxmd.com/read/28099324/interaction-of-isoflurane-tumor-necrosis-factor-%C3%AE-and-%C3%AE-amyloid-on-long-term-potentiation-in-rat-hippocampal-slices
#4
Ran Zhou, Philip Bickler
BACKGROUND: The relationship between inhalational anesthetics such as isoflurane and cognitive impairment in the elderly is controversial. Both β-amyloid peptide (Aβ), associated with Alzheimer disease, and tumor necrosis factor-α (TNF-α), a proinflammatory stress-related peptide, impair the synaptic function. We hypothesized that transient exposure to isoflurane and these peptides would impair synaptic function, manifest as a depression of long-term potentiation (LTP) and paired pulse facilitation (PPF), in the rat hippocampus...
February 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28099083/update-on-alzheimer-s-disease-therapy-and-prevention-strategies
#5
W Vallen Graham, Alessandra Bonito-Oliva, Thomas P Sakmar
Alzheimer's disease (AD) is the primary cause of age-related dementia. Effective strategies to prevent and treat AD remain elusive despite major efforts to understand its basic biology and clinical pathophysiology. Significant investments in therapeutic drug discovery programs over the past two decades have yielded some important insights but no blockbuster drugs to alter the course of disease. Because significant memory loss and cognitive decline are associated with neuron death and loss of gray matter, especially in the frontal cortex and hippocampus, some focus in drug development has shifted to early prevention of cellular pathology...
January 14, 2017: Annual Review of Medicine
https://www.readbyqxmd.com/read/28098506/capsicum-annuum-var-grossum-bell-pepper-inhibits-%C3%AE-secretase-activity-and-%C3%AE-amyloid1-40-aggregation
#6
Omodesola Oluwafisayo Ogunruku, Ganiyu Oboh, Sabina Passamonti, Federica Trammer, Aline Augusti Boligon
The deposition of amyloid protein as senile plaques is the major signature of Alzheimer's disease (AD). It is produced by the sequential cleavage of the amyloid precursor protein by secretases. Moreover, peppers are noted for their antiaging and cognitive enhancing properties. Thus, in this study, the effects of polyphenol-rich extracts from bell pepper on amyloid production and aggregation in vitro were investigated. Bell pepper (ripe and unripe) was extracted with methanol-1 N HCl (1:1 v/v). Thereafter, the inhibitory potentials of the extracts on β-secretase and β-amyloid1-40 aggregation were determined...
January 18, 2017: Journal of Medicinal Food
https://www.readbyqxmd.com/read/28097868/development-of-phenothiazine-based-theranostic-compounds-that-act-both-as-inhibitors-of-%C3%AF-amyloid-aggregation-and-imaging-probes-for-amyloid-plaques-in-alzheimer-s-disease
#7
Pascal Dao, Feifei Ye, Yan Liu, Zhiyun Du, Kun Zhang, Chang-Zhi Dong, Bernard Meunier, Huixiong Chen
Early detection of Alzheimer's disease (AD) is imperative in enabling the understanding and clinical treatment of this disorder, as well as in preventing its progression. Imaging agents specifically targeting Aβ plaques in the brain and the retina may lead to the early diagnosis of AD. Among them, near infrared fluorescent imaging has emerged as an attractive tool to noninvasively identify and monitor diseases during the preclinical and early stages. In the present study, we report the design, synthesis and evaluation of a series of new near-infrared fluorescent probes...
January 18, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28097521/alcohol-consumption-and-dementia-risk-a-dose-response-meta-analysis-of-prospective-studies
#8
Wei Xu, Huifu Wang, Yu Wan, Chenchen Tan, Jieqiong Li, Lan Tan, Jin-Tai Yu
It is widely believed that light-to-moderate alcohol intake may protect against dementia while excessive drinking may instead increase the risk. Nonetheless, these findings need cautious interpretations due to varying methodologies and lack of standard definition, which hindered our transferring into preventative practice. The objective of this study is to investigate the potential dose-response association between alcohol consumption and risk of dementia. A systematic search was conducted in electronic databases to identify relevant studies...
January 17, 2017: European Journal of Epidemiology
https://www.readbyqxmd.com/read/28096459/zinc-and-copper-differentially-modulate-amyloid-precursor-protein-processing-by-%C3%AE-secretase-and-amyloid-%C3%AE-peptide-production
#9
Hermeto Gerber, Fang Wu, Mitko Dimitrov, Guillermo M Garcia Osuna, Patrick C Fraering
Recent evidence suggests involvement of biometal homeostasis in the pathological mechanisms in Alzheimer's disease (AD). For example, increased intracellular copper or zinc has been linked to a reduction in secreted levels of the AD-causing amyloid-β peptide (Aβ). However, little is known about whether these biometals modulate the generation of Aβ. In the present study, we demonstrate in both cell-free and cell-based assays that zinc and copper regulate Aβ production by distinct molecular mechanisms affecting the processing by γ-secretase of its Aβ precursor protein substrate APP-C99...
January 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28096295/does-selection-for-short-sleep-duration-explain-human-vulnerability-to-alzheimer-s-disease
#10
Randolph M Nesse, Caleb E Finch, Charles L Nunn
Compared with other primates, humans sleep less and have a much higher prevalence of Alzheimer 's disease (AD) pathology. This article reviews evidence relevant to the hypothesis that natural selection for shorter sleep time in humans has compromised the efficacy of physiological mechanisms that protect against AD during sleep. In particular, the glymphatic system drains interstitial fluid from the brain, removing extra-cellular amyloid beta (eAβ) twice as fast during sleep. In addition, melatonin - a peptide hormone that increases markedly during sleep - is an effective antioxidant that inhibits the polymerization of soluble eAβ into insoluble amyloid fibrils that are associated with AD...
January 16, 2017: Evolution, Medicine, and Public Health
https://www.readbyqxmd.com/read/28095900/post-stroke-dementia-a-comprehensive-review
#11
REVIEW
Milija D Mijajlović, Aleksandra Pavlović, Michael Brainin, Wolf-Dieter Heiss, Terence J Quinn, Hege B Ihle-Hansen, Dirk M Hermann, Einor Ben Assayag, Edo Richard, Alexander Thiel, Efrat Kliper, Yong-Il Shin, Yun-Hee Kim, SeongHye Choi, San Jung, Yeong-Bae Lee, Osman Sinanović, Deborah A Levine, Ilana Schlesinger, Gillian Mead, Vuk Milošević, Didier Leys, Guri Hagberg, Marie Helene Ursin, Yvonne Teuschl, Semyon Prokopenko, Elena Mozheyko, Anna Bezdenezhnykh, Karl Matz, Vuk Aleksić, DafinFior Muresanu, Amos D Korczyn, Natan M Bornstein
Post-stroke dementia (PSD) or post-stroke cognitive impairment (PSCI) may affect up to one third of stroke survivors. Various definitions of PSCI and PSD have been described. We propose PSD as a label for any dementia following stroke in temporal relation. Various tools are available to screen and assess cognition, with few PSD-specific instruments. Choice will depend on purpose of assessment, with differing instruments needed for brief screening (e.g., Montreal Cognitive Assessment) or diagnostic formulation (e...
January 18, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28093699/anti-alzheimer-s-disease-activity-of-compounds-from-the-root-bark-of-morus-alba-l
#12
Eun Bi Kuk, A Ra Jo, Seo In Oh, Hee Sook Sohn, Su Hui Seong, Anupom Roy, Jae Sue Choi, Hyun Ah Jung
The inhibition of acetylcholinesterase (AChE), butyrylcholinesterase (BChE), and β-site amyloid precursor protein cleaving enzyme 1 (BACE1) plays important roles in prevention and treatment of Alzheimer's disease (AD). Among the individual parts of Morus alba L. including root bark, branches, leaves, and fruits, the root bark showed the most potent enzyme inhibitory activities. Therefore, the aim of this study was to evaluate the anti-AD activity of the M. alba root bark and its isolate compounds, including mulberrofuran G (1), albanol B (2), and kuwanon G (3) via inhibition of AChE, BChE, and BACE1...
January 16, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/28092015/enhancing-cognitive-functioning-in-healthly-older-adults-a-systematic-review-of-the-clinical-significance-of-commercially-available-computerized-cognitive-training-in-preventing-cognitive-decline
#13
REVIEW
Tejal M Shah, Michael Weinborn, Giuseppe Verdile, Hamid R Sohrabi, Ralph N Martins
Successfully assisting older adults to maintain or improve cognitive function, particularly when they are dealing with neurodegenerative disorders such as Alzheimer's disease (AD), remains a major challenge. Cognitive training may stimulate neuroplasticity thereby increasing cognitive and brain reserve. Commercial brain training programs are computerized, readily-available, easy-to-administer and adaptive but often lack supportive data and their clinical validation literature has not been previously reviewed...
January 14, 2017: Neuropsychology Review
https://www.readbyqxmd.com/read/28091722/hyperphosphorylated-tau-causes-reduced-hippocampal-ca1-excitability-by-relocating-the-axon-initial-segment
#14
Robert John Hatch, Yan Wei, Di Xia, Jürgen Götz
Hyperphosphorylated tau has a critical role in tauopathies such as Alzheimer's disease and frontotemporal dementia, impairing neuronal function and eventually leading to neurodegeneration. A critical role for tau is supported by studies in transgenic mouse models that express the P301L tau mutation found in cases of familial frontotemporal dementia, with the accumulation of hyperphosphorylated tau in the hippocampus causing reductions in hippocampal long-term potentiation and impairments in spatial learning and memory...
January 16, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28090177/the-effects-of-crocin-on-6-ohda-induced-oxidative-nitrosative-damage-and-motor-behaviour-in-hemiparkinsonian-rats
#15
Maryam Hosseini, Ziba Rajaei, Hojjatallah Alaei, Mohamadhasan Tajadini
BACKGROUND: Crocin is considered to prevent oxidative stress-related diseases, such as ischemia and Alzheimer's. The aim of the present investigation was to evaluate the effects of crocin on motor behaviour and 6-OHDA-induced oxidative/nitrosative damage to the striatum in an experimental model of Parkinson's disease. METHODS: Left medial forebrain bundle was lesioned by microinjection of 6-OHDA (16μg in 0.2% ascorbate-saline). Crocin (30 and 60 mg/kg) was injected intraperitoneally three days before surgery until six weeks...
November 2016: Malaysian Journal of Medical Sciences: MJMS
https://www.readbyqxmd.com/read/28089695/the-pharmacology-of-tacrine-at-n-methyl-d-aspartate-receptors
#16
REVIEW
Martin Horak, Kristina Holubova, Eugenie Nepovimova, Jan Krusek, Martina Kaniakova, Jan Korabecny, Ladislav Vyklicky, Kamil Kuca, Ales Stuchlik, Jan Ricny, Karel Vales, Ondrej Soukup
The mechanism of tacrine as a precognitive drug has been considered to be complex and not fully understood. It has been reported to involve a wide spectrum of targets involving cholinergic, gabaergic, nitrinergic and glutamatergic pathways. Here, we review the effect of tacrine and its derivatives on the NMDA receptors (NMDAR) with a focus on the mechanism of action and biological consequences related to the Alzheimer's disease treatment. Our findings indicate that effect of tacrine on glutamatergic neurons is both direct and indirect...
January 13, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28087694/iso-%C3%AE-acids-bitter-components-of-beer-prevent-inflammation-and-cognitive-decline-induced-in-a-mouse-model-of-alzheimer-s-disease
#17
Yasuhisa Ano, Atsushi Dhata, Yoshimasa Taniguchi, Ayaka Hoshi, Kazuyuki Uchida, Akihiko Takashima, Hiroyuki Nakayama
Alongside the rapid growth in aging populations worldwide, prevention and therapy for age-related memory decline and dementia are in great demand to maintain a long healthy life. Here we found that iso-α-acids, hop-derived bitter compounds in beer, enhance microglial phagocytosis and suppress inflammation via activation of the peroxisome proliferator-activated receptor (PPAR-γ). In normal mice, oral administration of iso-α-acids led to a significant increase both in CD11b and CD206 double-positive anti-inflammatory type microglia (P<0...
January 13, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28087304/sleep-and-neurodegeneration-a-critical-appraisal
#18
REVIEW
Jagan A Pillai, James B Leverenz
Sleep abnormalities are clearly recognized as distinct clinical symptom of concern in neurodegenerative disorders. Appropriate management of sleep related symptoms has a positive impact on the quality of life of patients with neurodegenerative disorders. This review provides an overview of mechanisms that are currently being considered that tie sleep with neurodegeneration. It appraises the literature regarding specific sleep changes among common neurodegenerative diseases with a focus on Alzheimer's disease and synucleinopathies (i...
January 10, 2017: Chest
https://www.readbyqxmd.com/read/28086917/resveratrol-regulates-neuro-inflammation-and-induces-adaptive-immunity-in-alzheimer-s-disease
#19
Charbel Moussa, Michaeline Hebron, Xu Huang, Jaeil Ahn, Robert A Rissman, Paul S Aisen, R Scott Turner
BACKGROUND: Treatment of mild-moderate Alzheimer's disease (AD) subjects (N = 119) for 52 weeks with the SIRT1 activator resveratrol (up to 1 g by mouth twice daily) attenuates progressive declines in CSF Aβ40 levels and activities of daily living (ADL) scores. METHODS: For this retrospective study, we examined banked CSF and plasma samples from a subset of AD subjects with CSF Aβ42 <600 ng/ml (biomarker-confirmed AD) at baseline (N = 19 resveratrol-treated and N = 19 placebo-treated)...
January 3, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28079198/oligomerization-of-fvflm-peptides-and-their-ability-to-inhibit-beta-amyloid-peptides-aggregation-consideration-as-a-possible-model
#20
M Kouza, A Banerji, A Kolinski, I A Buhimschi, A Kloczkowski
Preeclampsia, a pregnancy-specific disorder, shares typical pathophysiological features with protein misfolding disorders including Alzheimer's disease. Characteristic for preeclampsia is the involvement of multiple proteins of which fragments of SERPINA1 and β-amyloid co-aggregate in urine and placenta of preeclamptic women. To explore the biophysical basis of this interaction, we investigated the multidimensional efficacy of the FVFLM sequence in SERPINA1, as a model inhibitory agent of β-amyloid aggregation...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
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