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Microglia function

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https://www.readbyqxmd.com/read/28345586/new-insights-into-mononuclear-phagocyte-biology-from-the-visual-system
#1
REVIEW
Nancy J Reyes, Emily G O'Koren, Daniel R Saban
Major advances in mononuclear phagocyte biology have been made but key questions pertinent to their roles in health and disease remain, including in the visual system. One problem concerns how dendritic cells can trigger immune responses from certain tightly regulated immune- privileged sites of the eye. Another, albeit separate, problem involves whether there are functional specializations for microglia versus monocytes in retinal neurodegeneration. In this Review, we examine novel insights in eye immune privilege and, separately, we discuss recent inroads concerning retinal degeneration...
March 27, 2017: Nature Reviews. Immunology
https://www.readbyqxmd.com/read/28343297/association-of-the-cx3cr1-v249i-variant-with-neurofibrillary-pathology-progression-in-late-onset-alzheimer-s-disease
#2
Alan López-López, Ellen Gelpi, Diana Maria Lopategui, Jose M Vidal-Taboada
Neuroinflammation and microglial dysfunction have a prominent role in the pathogenesis of late-onset Alzheimer's disease (LOAD). CX3CR1 is a microglia-specific gene involved in microglia-neuron crosstalk and neuroinflammation. Numerous evidence show the involvement of CX3CR1 in AD. The aim of this study was to investigate if some functional genetic variants of this gene could influence on LOAD's outcome, in a neuropathologically confirmed Spanish cohort. We designed an open, pragmatic, case-control retrospective study including a total of 475 subjects (205 pathologically confirmed AD cases and 270 controls)...
March 25, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28343295/identification-of-sphingosine-1-phosphate-receptor-subtype-1-s1p1-as-a-pathogenic-factor-in-transient-focal-cerebral-ischemia
#3
Bhakta Prasad Gaire, Chi-Ho Lee, Arjun Sapkota, Sang Yeul Lee, Jerold Chun, Hee Jun Cho, Tae-Gyu Nam, Ji Woong Choi
Medically relevant roles of receptor-mediated sphingosine 1-phosphate (S1P) signaling have become a successful or promising target for multiple sclerosis or cerebral ischemia. Animal-based proof-of-concept validation for the latter is particularly through the neuroprotective efficacy of FTY720, a non-selective S1P receptor modulator, presumably via activation of S1P1. In spite of a clear link between S1P signaling and cerebral ischemia, it remains unknown whether the role of S1P1 is pathogenic or neuroprotective...
March 25, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28342781/modulation-of-neuroinflammation-the-role-and-therapeutic-potential-of-transient-receptor-potential-vanilloid-1-in-neuro-immune-axis
#4
REVIEW
Wei-Lin Kong, Yuan-Yuan Peng, Bi-Wen Peng
Transient receptor potential vanilloid type 1 channel (TRPV1), as a ligand-gated non-selective cation channel, has recently been demonstrated to have wide expression in the neuro-immune axis, where its multiple functions occur through regulation of both neuronal and non-neuronal activities. Growing evidence has suggested that TRPV1 is functionally expressed in glial cells, especially in the microglia and astrocytes. Glial cells perform immunological functions in response to pathophysiological challenges through pro-inflammatory or anti-inflammatory cytokines and chemokines in which TRPV1 is involved...
March 22, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28341583/a-story-of-birth-and-death-insights-into-the-formation-and-dynamics-of-the-microglial-population
#5
REVIEW
Katharine Askew, Diego Gomez-Nicola
Microglia are the main resident immunocompetent cells of the brain with key roles in brain development, homeostasis and function. Here we briefly review our current knowledge of the homeostatic mechanisms regulating the composition and turnover of the microglial population under physiological conditions from development to ageing. A greater understanding of these mechanisms may inform understanding of how dysregulation of microglial dynamics could contribute to the pathogenesis and/or progression of neurological disorders...
March 21, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28341582/sex-differences-in-microglial-phagocytosis-in-the-neonatal-hippocampus
#6
Lars H Nelson, Spencer Warden, Kathryn M Lenz
Microglia regulate brain development through many processes, such as promoting neurogenesis, supporting cell survival, and phagocytizing progenitor, newly-born, and dying cells. Many of these same developmental processes show robust sex differences, yet very few studies have assessed sex differences in microglia function during development. Hormonally-induced sexual differentiation of the brain occurs during the perinatal period, thus we examined sex differences in microglial morphology, phagocytosis, and proliferation in the hippocampus during the early postnatal period...
March 21, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28340583/inflammatory-signature-of-cerebellar-neurodegeneration-during-neonatal-hyperbilirubinemia-in-ugt1-mouse-model
#7
Simone Vodret, Giulia Bortolussi, Jana Jašprová, Libor Vitek, Andrés F Muro
BACKGROUND: Severe hyperbilirubinemia is toxic during central nervous system development. Prolonged and uncontrolled high levels of unconjugated bilirubin lead to bilirubin-induced neurological damage and eventually death by kernicterus. Bilirubin neurotoxicity is characterized by a wide array of neurological deficits, including irreversible abnormalities in motor, sensitive and cognitive functions, due to bilirubin accumulation in the brain. Despite the abundant literature documenting the in vitro and in vivo toxic effects of bilirubin, it is unclear which molecular and cellular events actually characterize bilirubin-induced neurodegeneration in vivo...
March 24, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28340576/polysaccharides-from-ganoderma-lucidum-attenuate-microglia-mediated-neuroinflammation-and-modulate-microglial-phagocytosis-and-behavioural-response
#8
Qing Cai, Yuanyuan Li, Gang Pei
BACKGROUND: Ganoderma lucidum (GL) has been widely used in Asian countries for hundreds of years to promote health and longevity. The pharmacological functions of which had been classified, including the activation of innate immune responses, suppression of tumour and modulation of cell proliferations. Effective fractions of Ganoderma lucidum polysaccharides (GLP) had already been reported to regulate the immune system. Nevertheless, the role of GLP in the microglia-mediated neuroinflammation has not been sufficiently elucidated...
March 24, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28339077/paeoniflorin-attenuates-the-neuroinflammatory-response-in-a-rat-model-of-chronic-constriction-injury
#9
Jianyu Zhou, Jingxia Wang, Wei Li, Chenglong Wang, Li Wu, Jianjun Zhang
Neuropathic pain remains the most frequent cause of suffering and disability worldwide. Paeoniflorin (PF), a water‑soluble monoterpene glycoside extracted from the roots of Paeonia lactiflora Pall, has a wide range of pharmacological functions. Although the neuroprotective effect of PF has been reported in animal models of neuropathology, no systematic investigation has reported on the analgesic properties of PF in neuropathic pain. The aim of the present study was to investigate whether PF can alleviate neuropathic pain and to examine its possible mechanism...
March 24, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28337124/interleukin-4-protects-dopaminergic-neurons-in-vitro-but-is-dispensable-for-mptp-induced-neurodegeneration-in-vivo
#10
Laura Hühner, Jennifer Rilka, Ralf Gilsbach, Xiaolai Zhou, Venissa Machado, Björn Spittau
Microglia are involved in physiological as well as neuropathological processes in the central nervous system (CNS). Their functional states are often referred to as M1-like and M2-like activation, and are believed to contribute to neuroinflammation-mediated neurodegeneration or neuroprotection, respectively. Parkinson's disease (PD) is one the most common neurodegenerative disease and is characterized by the progressive loss of midbrain dopaminergic (mDA) neurons in the substantia nigra resulting in bradykinesia, tremor, and rigidity...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28336435/in%C3%A2-vitro-model-of-cerebral-ischemia-by-using-brain-microvascular-endothelial-cells-derived-from-human-induced-pluripotent-stem-cells
#11
Yasuhiro Kokubu, Tomoko Yamaguchi, Kenji Kawabata
Brain-derived microvascular endothelial cells (BMECs), which play a central role in blood brain barrier (BBB), can be used for the evaluation of drug transport into the brain. Although human BMEC cell lines have already been reported, they lack original properties such as barrier integrity. Pluripotent stem cells (PSCs) can be used for various applications such as regenerative therapy, drug screening, and pathological study. In the recent study, an induction method of BMECs from PSCs has been established, making it possible to more precisely study the in vitro human BBB function...
March 21, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28336376/effect-of-anesthetics-on-microglial-activation-and-nanoparticle-uptake-implications-for-drug-delivery-in-traumatic-brain-injury
#12
Gokul Kannan, Siva P Kambhampati, Sapna R Kudchadkar
Traumatic brain injury (TBI) is a serious public health problem, often with devastating consequences for patients and their families. Affordable and timely therapies can have a substantial impact on outcomes in severe TBI. Despite the common use of sedatives and anesthetics in the acute phase of TBI management, their effect on glial cells is not well understood. We investigated the effect of a commonly used sedative, pentobarbital, on glial cells and their uptake of nanoparticles. First, we studied how pentobarbital affects BV2 mouse microglial cells in culture...
March 20, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28336086/incretin-hormones-regulate-microglia-oxidative-stress-survival-and-expression-of-trophic-factors
#13
Lindsay Joy Spielman, Deanna Lynn Gibson, Andis Klegeris
The incretin hormones glucagon-like peptide (GLP)-1 and glucose-dependent insulinotropic polypeptide (GIP) are primarily known for their metabolic function in the periphery. GLP-1 and GIP are secreted by intestinal endocrine cells in response to ingested nutrients. Both GLP-1 and GIP stimulate the production and release of insulin from pancreatic β cells as well as exhibit several growth-regulating effects on peripheral tissues. GLP-1 and GIP are also present in the brain, where they provide modulatory and anti-apoptotic signals to neurons...
March 8, 2017: European Journal of Cell Biology
https://www.readbyqxmd.com/read/28332093/pathogenic-implications-of-distinct-patterns-of-iron-and-zinc-in-chronic-ms-lesions
#14
Bogdan F Popescu, Josa M Frischer, Samuel M Webb, Mylyne Tham, Reginald C Adiele, Christopher A Robinson, Patrick D Fitz-Gibbon, Stephen D Weigand, Imke Metz, Susan Nehzati, Graham N George, Ingrid J Pickering, Wolfgang Brück, Simon Hametner, Hans Lassmann, Joseph E Parisi, Guo Yong, Claudia F Lucchinetti
Multiple sclerosis (MS) is a chronic inflammatory demyelinating disease of the central nervous system (CNS) in which oligodendrocytes, the CNS cells that stain most robustly for iron and myelin are the targets of injury. Metals are essential for normal CNS functioning, and metal imbalances have been linked to demyelination and neurodegeneration. Using a multidisciplinary approach involving synchrotron techniques, iron histochemistry and immunohistochemistry, we compared the distribution and quantification of iron and zinc in MS lesions to the surrounding normal appearing and periplaque white matter, and assessed the involvement of these metals in MS lesion pathogenesis...
March 22, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28330904/autonomous-tnf-is-critical-for-in-vivo-monocyte-survival-in-steady-state-and-inflammation
#15
Yochai Wolf, Anat Shemer, Michal Polonsky, Mor Gross, Alexander Mildner, Simon Yona, Eyal David, Ki-Wook Kim, Tobias Goldmann, Ido Amit, Mathias Heikenwalder, Sergei Nedospasov, Marco Prinz, Nir Friedman, Steffen Jung
Monocytes are circulating mononuclear phagocytes, poised to extravasate to sites of inflammation and differentiate into monocyte-derived macrophages and dendritic cells. Tumor necrosis factor (TNF) and its receptors are up-regulated during monopoiesis and expressed by circulating monocytes, as well as effector monocytes infiltrating certain sites of inflammation, such as the spinal cord, during experimental autoimmune encephalomyelitis (EAE). In this study, using competitive in vitro and in vivo assays, we show that monocytes deficient for TNF or TNF receptors are outcompeted by their wild-type counterpart...
March 22, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28326946/polyamidoamine-dendrimer-conjugated-triamcinolone-acetonide-attenuates-nerve-injury-induced-spinal-cord-microglia-activation-and-mechanical-allodynia
#16
Hwisung Kim, Boomin Choi, Hyoungsub Lim, Hyunjung Min, Jae Hoon Oh, Sunghyun Choi, Joung Goo Cho, Jong-Sang Park, Sung Joong Lee
Background Accumulating evidence on the causal role of spinal cord microglia activation in the development of neuropathic pain after peripheral nerve injury suggests that microglial activation inhibitors might be useful analgesics for neuropathic pain. Studies also have shown that polyamidoamine dendrimer may function as a drug delivery vehicle to microglia in the central nervous system. In this regard, we developed polyamidoamine dendrimer-conjugated triamcinolone acetonide, a previously identified microglial activation inhibitor, and tested its analgesic efficacy in a mouse peripheral nerve injury model...
January 2017: Molecular Pain
https://www.readbyqxmd.com/read/28326017/adiponectin-regulates-the-polarization-and-function-of-microglia-via-ppar-%C3%AE-signaling-under-amyloid-%C3%AE-toxicity
#17
Juhyun Song, Seong-Min Choi, Byeong C Kim
Alzheimer's disease (AD), characterized by the abnormal accumulation of amyloid beta (Aβ), is gradually increasing globally. Given that AD is considered a neuroinflammatory disease, recent studies have focused on the cellular mechanisms in brain inflammatory conditions that underlie AD neuropathology. Microglia are macrophage cells in the central nervous system (CNS) that are activated in response to Aβ condition. The function of microglia contributes to the neuroinflammation in AD brain, suggesting that microglia regulate the production of inflammatory mediators and contribute to the regeneration of damaged tissues...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28323268/ontogeny-and-homeostasis-of-cns-myeloid-cells
#18
REVIEW
Marco Prinz, Daniel Erny, Nora Hagemeyer
Myeloid cells in the central nervous system (CNS) represent a heterogeneous class of innate immune cells that contribute to the maintenance of tissue homeostasis differentially during development and adulthood. The subsets of CNS myeloid cells identified so far, including parenchymal microglia and non-parenchymal meningeal, perivascular and choroid-plexus macrophages, as well as disease-associated monocytes, have classically been distinguished on the basis of their surface epitope expression, localization and morphology...
March 22, 2017: Nature Immunology
https://www.readbyqxmd.com/read/28322752/neuroprotector-effect-of-stem-cells-from-human-exfoliated-deciduous-teeth-transplanted-after-traumatic-spinal-cord-injury-involves-inhibition-of-early-neuronal-apoptosis
#19
Fabrício do Couto Nicola, Marília Rossato Marques, Felipe Odorcyk, Danusa Mar Arcego, Letícia Petenuzzo, Dirceu Aristimunha, Adriana Vizuete, Eduardo Farias Sanches, Daniela Pavulack Pereira, Natasha Maurmann, Carla Dalmaz, Patricia Pranke, Carlos A Netto
Stem cells from human exfoliated deciduous teeth (SHED) transplants have been investigated as a possible treatment strategy for spinal cord injuries (SCI) due to their potential for promoting functional recovery. The aim of present study was to investigate the effects of SHED on neuronal death after an experimental model of SCI. METHODS: Wistar rats were spinalized using NYU impactor®. Animals were randomly distributed into 4 groups: Control (Naive) or Surgical control, Sham (laminectomy with no SCI); SCI (laminectomy followed by SCI, treated with vehicle); SHED (SCI treated with intraspinal transplantation of 3×10(5) SHED, 1 h after SCI)...
March 16, 2017: Brain Research
https://www.readbyqxmd.com/read/28322157/diabetes-related-neurological-implications-and-pharmacogenomics
#20
Rojas Carranza Camilo Andrés, Bustos Cruz Rosa Helena, Pino Pinzón Carmen Juliana, Ariza Marquez Yeimy Viviana, Gómez Bello Rosa Margarita, Cañadas Garre Marisa
Diabetes mellitus (DM) is the most commonly occurring cause of neuropathy around the world and is beginning to grow in countries where there is a risk of obesity. DM Type II, (T2DM) is a common age-related disease and is a major health concern, particularly in developed countries in Europe where the population is aging. T2DM is a chronic disease which is characterised by hyperglycemia, hyperinsulinemia and insulin resistance, together with the body's inability to use glucose as energy. Such metabolic disorder produces a chronic inflammatory state, as well as changes in lipid metabolism leading to hypertriglyceridemia, thereby producing chronic deterioration of the organs and premature morbidity and mortality...
March 17, 2017: Current Pharmaceutical Design
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