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Review of Alzheimer

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https://www.readbyqxmd.com/read/29045030/drug-delivery-to-the-brain-across-the-blood-brain-barrier-using-nanomaterials
#1
REVIEW
Yung-Hao Tsou, Xue-Qing Zhang, He Zhu, Sahla Syed, Xiaoyang Xu
A major obstacle facing brain diseases such as Alzheimer's disease, multiple sclerosis, brain tumors, and strokes is the blood-brain barrier (BBB). The BBB prevents the passage of certain molecules and pathogens from the circulatory system into the brain. Therefore, it is nearly impossible for therapeutic drugs to target the diseased cells without the assistance of carriers. Nanotechnology is an area of growing public interest; nanocarriers, such as polymer-based, lipid-based, and inorganic-based nanoparticles can be engineered in different sizes, shapes, and surface charges, and they can be modified with functional groups to enhance their penetration and targeting capabilities...
October 16, 2017: Small
https://www.readbyqxmd.com/read/29044447/relationship-between-androgen-deficiency-and-memory-impairment-in-aging-and-alzheimer-8217-s-disease
#2
Graciela Jiménez-Rubio, José J Herrera-Pérez, Olivia T Hernández-Hernández, Lucía Martínez-Mota
Aging and Alzheimer’s disease (AD) are associated with a declination of cognition and memory, whose severity increases in AD. Recent investigations point to a greater participation of neurofibrillary tangles (NFTs) than that of senile plaques, as responsible for cognitive impairment in AD and normal aging. On the other hand, aging is related with reduced levels of dehydroepiandrosterone (DHEA) and its sulfate (DHEA-S) as well as testosterone (T). Basic and clinical studies give evidence that hypoandrogenism is associated with memory impairment...
September 2017: Actas Españolas de Psiquiatría
https://www.readbyqxmd.com/read/29042888/cognitive-stimulation-as-a-therapeutic-modality-for-dementia-a-meta-analysis
#3
Kayoung Kim, Ji Won Han, Yoonseop So, Jiyeong Seo, You Joung Kim, Joon Hyuk Park, Seok Bum Lee, Jung Jae Lee, Hyun-Ghang Jeong, Tae Hui Kim, Ki Woong Kim
OBJECTIVE: Although cognitive stimulation (CS) is one of the most popular non-pharmacological interventions for people with dementia, its efficacy is still debatable. We performed a meta-analysis of randomized controlled trials (RCTs) on the efficacy of CS in people with dementia. METHODS: Data sources were identified by searching PubMed, MEDLINE, Embase, psychINFO, and Cochrane Reviews Library. A total of 7,354 articles were identified, and of these, 30 RCTs were selected based on the selection criteria...
September 2017: Psychiatry Investigation
https://www.readbyqxmd.com/read/29042289/current-evidence-on-the-effect-of-dietary-polyphenols-intake-on-chronic-diseases
#4
REVIEW
Chiara Costa, Aristidis Tsatsakis, Charalampos Mamoulakis, Michele Teodoro, Giusi Briguglio, Emanuela Caruso, Dimitris Tsoukalas, Denisa Margina, Efthimios Dardiotis, Demetrios Kouretas, Concettina Fenga
Polyphenols are secondary metabolites of plants. They comprise several antioxidant compounds and they are generally considered to be involved in the defense against human chronic diseases. During the last years, there has been growing scientific interest in their potential health benefits. In this comprehensive review, we focus on the current evidence defining the position of their dietary intake in the prevention/treatment of human chronic diseases, including prostate cancer and other types of cancer, cardiovascular diseases, diabetes mellitus and neurodegenerative diseases such as Alzheimer's and Parkinson's disease; we also discuss their ability to modulate multiple signalling transduction pathways involved in the pathophysiology of these diseases...
October 14, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29039762/marine-derived-2-aminoimidazolone-alkaloids-leucettamine-b-related-polyandrocarpamines-inhibit-mammalian-and-protozoan-dyrk-clk-kinases
#5
Nadège Loaëc, Eletta Attanasio, Benoît Villiers, Emilie Durieu, Tania Tahtouh, Morgane Cam, Rohan A Davis, Aline Alencar, Mélanie Roué, Marie-Lise Bourguet-Kondracki, Peter Proksch, Emmanuelle Limanton, Solène Guiheneuf, François Carreaux, Jean-Pierre Bazureau, Michelle Klautau, Laurent Meijer
A large diversity of 2-aminoimidazolone alkaloids is produced by various marine invertebrates, especially by the marine Calcareous sponges Leucetta and Clathrina. The phylogeny of these sponges and the wide scope of 2-aminoimidazolone alkaloids they produce are reviewed in this article. The origin (invertebrate cells, associated microorganisms, or filtered plankton), physiological functions, and natural molecular targets of these alkaloids are largely unknown. Following the identification of leucettamine B as an inhibitor of selected protein kinases, we synthesized a family of analogues, collectively named leucettines, as potent inhibitors of DYRKs (dual-specificity, tyrosine phosphorylation regulated kinases) and CLKs (cdc2-like kinases) and potential pharmacological leads for the treatment of several diseases, including Alzheimer's disease and Down syndrome...
October 17, 2017: Marine Drugs
https://www.readbyqxmd.com/read/29038736/down-but-not-out-the-consequences-of-pretangle-tau-in-the-locus-coeruleus
#6
REVIEW
Termpanit Chalermpalanupap, David Weinshenker, Jacki M Rorabaugh
Degeneration of locus coeruleus (LC) is an underappreciated hallmark of Alzheimer's disease (AD). The LC is the main source of norepinephrine (NE) in the forebrain, and its degeneration is highly correlated with cognitive impairment and amyloid-beta (Aβ) and tangle pathology. Hyperphosphorylated tau in the LC is among the first detectable AD-like neuropathology in the brain, and while the LC/NE system impacts multiple aspects of AD (e.g., cognition, neuropathology, and neuroinflammation), the functional consequences of hyperphosphorylated tau accrual on LC neurons are not known...
2017: Neural Plasticity
https://www.readbyqxmd.com/read/29038028/adiponectin-and-sporadic-alzheimer-s-disease-clinical-and-molecular-links
#7
REVIEW
Liliana Letra, Tiago Rodrigues, Paulo Matafome, Isabel Santana, Raquel Seiça
Obesity has been consistently associated with Alzheimer's disease (AD) though the exact mechanisms by which it influences cognition are still elusive and subject of current research. Adiponectin, the most abundant adipokine in circulation, is inversely correlated with adipose tissue dysfunction and seems to be a central player in this association. In fact, different signalling pathways are shared by adiponectin and proteins involved in AD pathophysiology and considerable amount of evidence supports its direct and indirect influence on β-amyloid and tau aggregates formation...
October 13, 2017: Frontiers in Neuroendocrinology
https://www.readbyqxmd.com/read/29037735/l-theanine-an-astounding-sui-generis-integrant-in-tea
#8
REVIEW
Eshita Sharma, Robin Joshi, Ashu Gulati
l-theanine (l-Th), a non-protein amino acid present in tea, is a valuable nutraceutical product with unique health benefits and used as an additive in food industry. l-Th enhances the umami taste but its use is limited due to its inadequate production. Different extraction approaches from tea shoots, chemical synthesis to microbial transformation have been tried to meet its demand. In vitro, in vivo as well as clinical studies have shown its positive effect in regulating CNS disorders. l-Th has become choice ingredient in CNS active products due to its anti-stress and neuroprotective role in dementias particularly in retrogression of Alzheimer's...
March 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29037490/alzheimer-s-disease-pathogenesis-is-there-a-role-for-folate
#9
REVIEW
Natassia Robinson, Peter Grabowski, Ishtiaq Rehman
Epigenetic modifications, including changes in DNA methylation, have been implicated in a wide range of diseases including neurological diseases such as Alzheimer's. The role of dietary folate in providing methyl groups required for maintenance and modulation of DNA methylation makes it a nutrient of interest in Alzheimer's. Late onset Alzheimer's disease is the most common form of dementia and at present its aetiology is largely undetermined. From epidemiological studies, the interactions between folate, B-vitamins and homocysteine as well as the long latency period has led to difficulties in interpretation of the data, thus current evidence exploring the role of dietary folate in Alzheimer's is contradictory and unresolved...
October 13, 2017: Mechanisms of Ageing and Development
https://www.readbyqxmd.com/read/29037228/neuroepigenetic-mechanisms-in-disease
#10
REVIEW
Michael A Christopher, Stephanie M Kyle, David J Katz
Epigenetics allows for the inheritance of information in cellular lineages during differentiation, independent of changes to the underlying genetic sequence. This raises the question of whether epigenetic mechanisms also function in post-mitotic neurons. During the long life of the neuron, fluctuations in gene expression allow the cell to pass through stages of differentiation, modulate synaptic activity in response to environmental cues, and fortify the cell through age-related neuroprotective pathways. Emerging evidence suggests that epigenetic mechanisms such as DNA methylation and histone modification permit these dynamic changes in gene expression throughout the life of a neuron...
October 16, 2017: Epigenetics & Chromatin
https://www.readbyqxmd.com/read/29037130/molecular-and-cellular-mechanisms-of-sporadic-alzheimer-s-disease-studies-on-rodent-models-in-vivo
#11
REVIEW
N V Gulyaeva, N V Bobkova, N G Kolosova, A N Samokhin, M Yu Stepanichev, N A Stefanova
In this review, recent data are presented on molecular and cellular mechanisms of pathogenesis of the most widespread (about 95%) sporadic forms of Alzheimer's disease obtained on in vivo rodent models. Although none of the available models can fully reproduce the human disease, several key molecular mechanisms (such as dysfunction of neurotransmitter systems, especially of the acetylcholinergic system, β-amyloid toxicity, oxidative stress, neuroinflammation, mitochondrial dysfunction, disturbances in neurotrophic systems) are confirmed with different models...
October 2017: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/29036903/resveratrol-and-amyloid-beta-mechanistic-insights
#12
REVIEW
Yongming Jia, Na Wang, Xuewei Liu
The amyloid-beta (Aβ) hypothesis that dyshomeostasis between Aβ production and clearance is a very early, key molecular factor in the etiology of Alzheimer's disease (AD) has been proposed and examined in the AD research field. Scientists have focused on seeking natural products or drugs to influence the dynamic equilibrium of Aβ, targeting production and clearance of Aβ. There is emerging evidence that resveratrol (Res), a naturally occurring polyphenol mainly found in grapes and red wine, acts on AD in numerous in vivo and in vitro models...
October 14, 2017: Nutrients
https://www.readbyqxmd.com/read/29036830/our-working-point-of-view-of-tau-protein
#13
Jesús Avila
Tau protein, which was discovered in Prof. Kirschner's laboratory in 1975, has been the focus of my research over the last 40 years. In this issue of the Journal of Alzheimer's Disease commemorating its 20th year of publication, I will provide a short review of some of the features of my relationship with tau.
October 8, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29036828/mitochondria-and-mitochondrial-cascades-in-alzheimer-s-disease
#14
Russell H Swerdlow
Decades of research indicate mitochondria from Alzheimer's disease (AD) patients differ from those of non-AD individuals. Initial studies revealed structural differences, and subsequent studies showed functional deficits. Observations of structure and function changes prompted investigators to consider the consequences, significance, and causes of AD-related mitochondrial dysfunction. Currently, extensive research argues mitochondria may mediate, drive, or contribute to a variety of AD pathologies. The perceived significance of these mitochondrial changes continues to grow, and many currently believe AD mitochondrial dysfunction represents a reasonable therapeutic target...
October 7, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29036826/what-can-quantitative-gait-analysis-tell-us-about-dementia-and-its-subtypes-a-structured-review
#15
Ríona Mc Ardle, Rosie Morris, Joanna Wilson, Brook Galna, Alan J Thomas, Lynn Rochester
Distinguishing dementia subtypes can be difficult due to similarities in clinical presentation. There is increasing interest in discrete gait characteristics as markers to aid diagnostic algorithms in dementia. This structured review explores the differences in quantitative gait characteristics between dementia and healthy controls, and between four dementia subtypes under single-task conditions: Alzheimer's disease (AD), dementia with Lewy bodies and Parkinson's disease dementia, and vascular dementia. Twenty-six papers out of an initial 5,211 were reviewed and interpreted using a validated model of gait...
October 7, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29035971/dietary-patterns-and-cognition-in-older-persons
#16
Angela M Abbatecola, Marcello Russo, Michelangela Barbieri
PURPOSE OF REVIEW: The current article reviews recently published evidence of the important role that specific dietary patterns may hold on preventing cognitive impairment and dementia over aging. RECENT FINDINGS: Specific dietary patterns attributed to targeting cardiovascular risk factors may protect against the development of mild cognitive impairment (MCI) and dementia, especially Alzheimer's disease. Numerous epidemiological studies have strongly suggested that multinutrient approaches using the Mediterranean diet (Med diet), dietary approach to systolic hypertension (DASH) and the Mediterranean-DASH diet intervention for neurodegenerative delay (MIND) are associated with a lower risk of cognitive impairment, MCI and Alzheimer's disease in older persons...
October 14, 2017: Current Opinion in Clinical Nutrition and Metabolic Care
https://www.readbyqxmd.com/read/29034866/the-health-effects-of-aluminum-exposure
#17
Katrin Klotz, Wobbeke Weistenhöfer, Frauke Neff, Andrea Hartwig, Christoph van Thriel, Hans Drexler
BACKGROUND: Aluminum is regularly taken up with the daily diet. It is also used in antiperspirants, as an adjuvant for vaccination, and in desensitization procedures. In this review, we present the scientifically documented harmful effects of aluminum on health and the threshold values associated with them. METHODS: This review is based on publications retrieved by a selective search of the PubMed and SCOPUS databases on the topic of aluminum in connection with neurotoxicity, Alzheimer's disease, and breast cancer, as well as on the authors' personal experience in occupational and environmental medicine...
September 29, 2017: Deutsches Ärzteblatt International
https://www.readbyqxmd.com/read/29032765/recent-patent-advances-for-neurodegenerative-disorders-and-its-treatment
#18
Bhavna Kumar, Deepika Sharma
BACKGROUND: Neurodegenerative disorders are one of the common diseases that affect our society with tremendous medical and financial burdens. As a whole, neurodegeneration affects individuals of all ages, but becomes increasingly frequent with age, coming to affect a very large share of our elderly population which is severely affecting the patient, caregivers, and enormously increasing the financial burden of the nation. These diseases share a very complex nature, which often result from combined genetic, environment and pathogenic factors...
October 10, 2017: Recent Patents on Drug Delivery & Formulation
https://www.readbyqxmd.com/read/29032502/gut-microbiota-changes-in-the-extreme-decades-of-human-life-a-focus-on-centenarians
#19
REVIEW
Aurelia Santoro, Rita Ostan, Marco Candela, Elena Biagi, Patrizia Brigidi, Miriam Capri, Claudio Franceschi
The gut microbiota (GM) is a complex, evolutionarily molded ecological system, which contributes to a variety of physiological functions. The GM is highly dynamic, being sensitive to environmental stimuli, and its composition changes over the host's entire lifespan. However, the basic question of how much these changes may be ascribed to variables such as population, diet, genetics and gender, and/or to the aging process per se is still largely unanswered. We argue that comparison among studies on centenarians-the best model of healthy aging and longevity-recruited from different geographical areas/populations (different genetics and dietary habits) can help to disentangle the contribution of aging and non-aging-related variables to GM remodeling with age...
October 14, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/29031834/dysregulation-of-neurotrophin-signaling-in-the-pathogenesis-of-alzheimer-disease-and-of-alzheimer-disease-in-down-syndrome
#20
REVIEW
Xu-Qiao Chen, Mariko Sawa, William C Mobley
Neurotrophic factors, including the members of the neurotrophin family, play important roles in the development and maintenance of the nervous system. Trophic factor signals must be transmitted over long distances from axons and dendrites to the cell bodies of neurons. A mode of signaling well suited to the challenge of robust long distance signaling is the signaling endosome. We review the biology of signaling endosomes and the "signaling endosome hypothesis". Evidence for disruption of signaling endosome function in disorders of the nervous system is also reviewed...
October 11, 2017: Free Radical Biology & Medicine
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