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https://www.readbyqxmd.com/read/28319893/role-of-macrophages-in-age-related-oxidative-stress-and-lipofuscin-accumulation-in-mice
#1
Carmen Vida, Irene Martínez de Toda, Julia Cruces, Antonio Garrido, Mónica Gonzalez-Sanchez, Mónica De la Fuente
The age-related changes in the immune functions (immunosenescence) may be mediated by an increase of oxidative stress and damage affecting leukocytes. Although the "oxidation-inflammation" theory of aging proposes that phagocytes are the main immune cells contributing to "oxi-inflamm-aging", this idea has not been corroborated. The aim of this work was to characterize the age-related changes in several parameters of oxidative stress and immune function, as well as in lipofuscin accumulation ("a hallmark of aging"), in both total peritoneal leukocyte population and isolated peritoneal macrophages...
March 9, 2017: Redox Biology
https://www.readbyqxmd.com/read/28317026/toxoplasma-gondii-ap2ix-4-regulates-gene-expression-during-bradyzoite-development
#2
Sherri Huang, Michael J Holmes, Joshua B Radke, Dong-Pyo Hong, Ting-Kai Liu, Michael W White, William J Sullivan
Toxoplasma gondii is a protozoan parasite of great importance to human and animal health. In the host, this obligate intracellular parasite persists as a tissue cyst that is imperceptible to the immune response and unaffected by current therapies. The tissue cysts facilitate transmission through predation and give rise to chronic cycles of toxoplasmosis in immunocompromised patients. Transcriptional changes accompany conversion of the rapidly replicating tachyzoites into the encysted bradyzoites, and yet the mechanisms underlying these alterations in gene expression are not well defined...
March 2017: MSphere
https://www.readbyqxmd.com/read/28315757/chronic-social-stress-leads-to-altered-sleep-homeostasis-in-mice
#3
Nadja Olini, Iru Rothfuchs, Damiano Azzinnari, Christopher R Pryce, Salome Kurth, Reto Huber
Disturbed sleep and altered sleep homeostasis are core features of many psychiatric disorders such as depression. Chronic uncontrollable stress is considered an important factor in the development of depression, but little is known on how chronic stress affects sleep regulation and sleep homeostasis. We therefore examined the effects of chronic social stress (CSS) on sleep regulation in mice. Adult male C57BL/6 mice were implanted for electrocortical recordings (ECoG) and underwent either a 10-day CSS protocol or control handling (CON)...
March 15, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28315683/klotho-ameliorates-cyclosporine-a-induced-nephropathy-via-pdlim2-nf-kb-p65-signaling-pathway
#4
Meihua Jin, Pengfei Lv, Guanyu Chen, Peng Wang, Zhongfu Zuo, Lili Ren, Jing Bi, Chul-Woo Yang, Xifan Mei, Donghe Han
Klotho, an antiaging protein, can extend the lifespan and modulate cellular responses to inflammation and oxidative stress which can ameliorate chronic kidney diseases (CKD). To investigate the molecular mechanism of Klotho on inflammation in cyclosporine A (CsA) induced nephropathy, the mice were transfected with adenovirus mediated Klotho gene and treated with cyclosporine A (CsA; 30 mg/kg/day) for 4 weeks. Also, primary human renal proximal tubule epithelial cells (RPTECs) were treated with soluble Klotho protein and LPS...
March 15, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28315459/dynamic-reorganization-of-intrinsic-functional-networks-in-the-mouse-brain
#5
Joanes Grandjean, Maria Giulia Preti, Thomas Aw Bolton, Michaela Buerge, Erich Seifritz, Christopher R Pryce, Dimitri Van De Ville, Markus Rudin
Functional connectivity (FC) derived from resting-state functional magnetic resonance imaging (rs-fMRI) allows for the integrative study of neuronal processes at a macroscopic level. The majority of studies to date have assumed stationary interactions between brain regions, without considering the dynamic aspects of network organization. Only recently has the latter received increased attention, predominantly in human studies. Applying dynamic FC (dFC) analysis to mice is attractive given the relative simplicity of the mouse brain and the possibility to explore mechanisms underlying network dynamics using pharmacological, environmental or genetic interventions...
March 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28315276/the-sigma-1-receptor-a-therapeutic-target-for-the-treatment-of-als
#6
Timur A Mavlyutov, Erin M Baker, Tasher M Losenegger, Jaimie R Kim, Brian Torres, Miles L Epstein, Arnold E Ruoho
The membrane bound 223 amino acid Sigma-1 Receptor (S1R) serves as a molecular chaperone and functional regulator of many signaling proteins. Spinal cord motor neuron activation occurs, in part, via large ventral horn cholinergic synapses called C-boutons/C-terminals. Chronic excitation of motor neurons and alterations in C-terminals has been associated with Amyotrophic Lateral Sclerosis (ALS ). The S1R has an important role in regulating motor neuron function. High levels of the S1R are localized in postsynaptic endoplasmic reticulum (ER) subsurface cisternae within 10-20 nm of the plasma membrane that contain muscarinic type 2 acetylcholine receptors (M2AChR), calcium activated potassium channels (Kv2...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28314964/increased-intake-of-energy-dense-diet-and-negative-energy-balance-in-a-mouse-model-of-chronic-psychosocial-defeat
#7
Roberto Coccurello, Adele Romano, Giacomo Giacovazzo, Bianca Tempesta, Marco Fiore, Anna Maria Giudetti, Ilaria Marrocco, Fabio Altieri, Anna Moles, Silvana Gaetani
PURPOSE: Chronic exposure to stress may represent a risk factor for developing metabolic and eating disorders, mostly driven by the overconsumption of easily accessible energy-dense palatable food, although the mechanisms involved remain still unclear. In this study, we used an ethologically oriented murine model of chronic stress caused by chronic psychosocial defeat (CPD) to investigate the effects of unrestricted access to a palatable high fat diet (HFD) on food intake, body weight, energy homeostasis, and expression of different brain neuropeptides...
March 17, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28314819/depressive-like-behaviors-are-regulated-by-nox1-nadph-oxidase-by-redox-modification-of-nmda-receptor-1
#8
Masakazu Ibi, Junjie Liu, Noriaki Arakawa, Shiho Kitaoka, Ai Kawaji, Ken-Ichi Matsuda, Kazumi Iwata, Misaki Matsumoto, Masato Katsuyama, Kai Zhu, Satoshi Teramukai, Tomoyuki Furuyashiki, Chihiro Yabe-Nishimura
Involvement of reactive oxygen species (ROS) has been suggested in the development of psychiatric disorders. NOX1 is a non-phagocytic form of NADPH oxidase whose expression in the nervous system is negligible compared with other NOX isoforms. However, NOX1-derived ROS increase inflammatory pain and tolerance to opioid analgesia. To clarify the role of NOX1 in the brain, we examined depressive-like behaviors in mice deficient in Nox1 (Nox1(-/Y)). Depressive-like behaviors induced by chronic social defeat stress or administration of corticosterone (CORT) were significantly ameliorated in Nox1(-/Y) Generation of ROS was significantly elevated in the prefrontal cortex (PFC) of mice administrated with CORT, while NOX1 mRNA was up-regulated only in the ventral tegmental area (VTA) among brain areas responsible for emotional behaviors...
March 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28304184/chronic-stress-induced-disruption-of-the-peri-infarct-neurovascular-unit-following-experimentally-induced-photothrombotic-stroke
#9
Zidan Zhao, Lin Kooi Ong, Sarah Johnson, Michael Nilsson, Frederick R Walker
How stress influences brain repair is an issue of considerable importance, as patients recovering from stroke are known to experience high and often unremitting levels of stress post-event. In the current study, we investigated how chronic stress modified the key cellular components of the neurovascular unit. Using an experimental model of focal cortical ischemia in male C57BL/6 mice, we examined how exposure to a persistently aversive environment, induced by the application of chronic restraint stress, altered the cortical remodeling post-stroke...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28302445/agmatine-attenuates-chronic-unpredictable-mild-stress-induced-anxiety-depression-like-behaviours-and-cognitive-impairment-by-modulating-nitrergic-signalling-pathway
#10
Nitin B Gawali, Vipin D Bulani, Malvika S Gursahani, Padmini S Deshpande, Pankaj S Kothavade, Archana R Juvekar
Agmatine, a neurotransmitter/neuromodulator, has shown to exert numerous effects on the CNS. Chronic stress is a risk factor for development of depression, anxiety and deterioration of cognitive performance. Compelling evidences indicate an involvement of nitric oxide (NO) pathway in these disorders. Hence, investigation of the beneficial effects of agmatine on chronic unpredictable mild stress (CUMS)-induced depression, anxiety and cognitive performance with the involvement of nitrergic pathway was undertaken...
March 13, 2017: Brain Research
https://www.readbyqxmd.com/read/28300775/protective-effects-of-fucoidan-on-a%C3%AE-25-35-and-d-gal-induced-neurotoxicity-in-pc12-cells-and-d-gal-induced-cognitive-dysfunction-in-mice
#11
Hengyun Wei, Zixiang Gao, Luping Zheng, Cuili Zhang, Zundong Liu, Yazong Yang, Hongming Teng, Lin Hou, Yuling Yin, Xiangyang Zou
Alzheimer's disease (AD) is a chronic neurodegenerative disease which contributes to memory loss and cognitive decline in the elderly. Fucoidan, extracted from brown algae, is a complex sulfated polysaccharide and potential bioactive compound. In this study, we investigated whether fucoidan protects PC12 cells from apoptosis induced by a combination of beta-amyloid 25-35 (Aβ25-35) and d-galactose (d-Gal), and improves learning and memory impairment in AD model mice. The results indicated that fucoidan could inhibit the release of cytochrome c from the mitochondria to cytosol and activation of caspases, and increase the expression of apoptosis inhibitor proteins (IAPs), including livin and X-linked IAP (XIAP) in PC12 cells damaged by Aβ25-35 and d-Gal-induction...
March 16, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28294390/combined-xil-6r-and-urocortin-2-treatment-restores-mdx-diaphragm-muscle-force
#12
Jennifer Manning, Maria M Buckley, Ken D O'Halloran, Dervla O'Malley
Introduction Duchenne muscular dystrophy (DMD) is characterized by progressive muscle degeneration leading to immobility, respiratory failure and premature death. As chronic inflammation and stress are implicated in DMD pathology, the efficacy of an anti-inflammatory and anti-stress intervention strategy in ameliorating diaphragm dysfunction was investigated. Methods Diaphragm muscle contractile function was compared in wild-type and dystrophin-deficient mdx mice treated with saline, anti-IL-6R antibodies (xIL-6R), the corticotrophin-releasing factor receptor 2 (CRFR2) agonist, urocortin 2 or both xIL-6R and urocortin 2...
March 13, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28292831/reduction-of-ether-type-glycerophospholipids-plasmalogens-by-nf-%C3%AE%C2%BAb-signal-leading-to-microglial-activation
#13
Md Shamim Hossain, Yuichi Abe, Fatma Ali, Mohammed Youssef, Masanori Honsho, Yukio Fujiki, Toshihiko Katafuchi
Neuroinflammation characterized by activation of glial cells is observed in various neurodegenerative diseases including Alzheimer's disease (AD). Although the reduction of ether-type glycerophospholipids, plasmalogens (Pls), in the brain is reported in AD patients, the mechanism of the reduction and its impact on neuroinflammation remained elusive. In the present study, we found for the first time that various inflammatory stimuli reduced the Pls levels in the murine glial cells via NF-κB activation which then down-regulated a Pls synthesizing enzyme, glycerone phosphate O-acyltransferase (Gnpat) through the increased c-Myc recruitment onto the Gnpat promoter...
March 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28289693/cav1-2-channels-mediate-persistent-chronic-stress-induced-behavioral-deficits-that-are-associated-with-prefrontal-cortex-activation-of-the-p25-cdk5-glucocorticoid-receptor-pathway
#14
Charlotte C Bavley, Delaney K Fischer, Bryant K Rizzo, Anjali M Rajadhyaksha
Chronic stress is known to precipitate and exacerbate neuropsychiatric symptoms, and exposure to stress is particularly pathological in individuals with certain genetic predispositions. Recent genome wide association studies have identified single nucleotide polymorphisms (SNPs) in the gene CACNA1C, which codes for the Cav1.2 subunit of the L-type calcium channel (LTCC), as a common risk variant for multiple neuropsychiatric conditions. Cav1.2 channels mediate experience-dependent changes in gene expression and long-term synaptic plasticity through activation of downstream calcium signaling pathways...
December 2017: Neurobiology of Stress
https://www.readbyqxmd.com/read/28286225/immunological-alteration-toxic-molecular-inductions-leading-to-cognitive-impairment-neurotoxicity-in-transgenic-mouse-model-of-alzheimer-s-disease
#15
Manuj Ahuja, Manal Buabeid, Engy Abdel-Rehman, Mohammed Majrashi, Kodeeswaran Parameshwaran, Rajesh Amin, Sindhu Ramesh, Kariharan Thiruchelvan, Satyanarayana Pondugula, Vishnu Suppiramaniam, Muralikrishnan Dhanasekaran
AIMS: Inflammation is considered to be one of the crucial pathological factors associated with the development of Alzheimer's disease, although supportive experimental evidence remains undiscovered. Therefore, the current study was carried out to better understand and establish the pathophysiological involvement of chronic inflammation in a double transgenic mouse model of Alzheimer's disease. MAIN METHODS: We analyzed amyloid-beta deposition, oxidative stress, biochemical, neurochemical and immunological markers in a 10month old (APΔE9) mouse model...
March 9, 2017: Life Sciences
https://www.readbyqxmd.com/read/28279894/inhalation-of-progesterone-inhibits-chronic-airway-inflammation-of-mice-exposed-to-ozone
#16
Xia Fei, Wuping Bao, Pengyu Zhang, Xue Zhang, Guoqing Zhang, Yingying Zhang, Xin Zhou, Min Zhang
Chronic ozone exposure leads to a model of mice with lung inflammation, emphysema and oxidative stress. Progesterone plays an important role in attenuating the neuroinflammation. We assume that progesterone will reduce the chronic airway inflammation exposed to ozone and evaluate whether combination of progesterone with glucocorticoids results in synergistic effects. C57/BL6 mice were exposed to ozone (2.5ppm, 3h) 12 times over 6 weeks, and were administered with progesterone (0.03 or 0.3mg/L; inhaled) alone or combined with budesonide (BUD) (0...
March 6, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28279226/the-ppar-pan-agonist-bezafibrate-ameliorates-cardiomyopathy-in-a-mouse-model-of-barth-syndrome
#17
Yan Huang, Corey Powers, Victoria Moore, Caitlin Schafer, Mindong Ren, Colin K L Phoon, Jeanne F James, Alexander V Glukhov, Sabzali Javadov, Frédéric M Vaz, John L Jefferies, Arnold W Strauss, Zaza Khuchua
BACKGROUND: The PGC-1α/PPAR axis has been proposed as a potential therapeutic target for several metabolic disorders. The aim was to evaluate the efficacy of the pan-PPAR agonist, bezafibrate, in tafazzin knockdown mice (TazKD), a mouse model of Barth syndrome that exhibits age-dependent dilated cardiomyopathy with left ventricular (LV) dysfunction. RESULTS: The effect of bezafibrate on cardiac function was evaluated by echocardiography in TazKD mice with or without beta-adrenergic stress...
March 9, 2017: Orphanet Journal of Rare Diseases
https://www.readbyqxmd.com/read/28278165/indomethacin-counteracts-the-effects-of-chronic-social-defeat-stress-on-emotional-but-not-recognition-memory-in-mice
#18
Aránzazu Duque, Concepción Vinader-Caerols, Santiago Monleón
We have previously observed the impairing effects of chronic social defeat stress (CSDS) on emotional memory in mice. Given the relation between stress and inflammatory processes, we sought to study the effectiveness of the anti-inflammatory indomethacin in reversing the detrimental effects of CSDS on emotional memory in mice. The effects of CSDS and indomethacin on recognition memory were also evaluated. Male CD1 mice were randomly divided into four groups: non-stressed + saline (NS+SAL); non-stressed + indomethacin (NS+IND); stressed + saline (S+SAL); and stressed + indomethacin (S+IND)...
2017: PloS One
https://www.readbyqxmd.com/read/28275719/a-negative-allosteric-modulator-for-%C3%AE-5-subunit-containing-gaba-receptors-exerts-a-rapid-and-persistent-antidepressant-like-action-without-the-side-effects-of-the-nmda-receptor-antagonist-ketamine-in-mice
#19
Panos Zanos, Mackenzie E Nelson, Jaclyn N Highland, Samuel R Krimmel, Polymnia Georgiou, Todd D Gould, Scott M Thompson
New antidepressant pharmacotherapies that provide rapid relief of depressive symptoms are needed. The NMDA receptor antagonist ketamine exerts rapid antidepressant actions in depressed patients but also side effects that complicate its clinical utility. Ketamine promotes excitatory synaptic strength, likely by producing high-frequency correlated activity in mood-relevant regions of the forebrain. Negative allosteric modulators of GABA-A receptors containing α5 subunits (α5 GABA-NAMs) should also promote high-frequency correlated electroencephalogram (EEG) activity and should therefore exert rapid antidepressant responses...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28272348/zinc-prevents-the-development-of-diabetic-cardiomyopathy-in-db-db-mice
#20
Shudong Wang, Bowei Wang, Yuehui Wang, Qian Tong, Quan Liu, Jian Sun, Yang Zheng, Lu Cai
Diabetic cardiomyopathy (DCM) is highly prevalent in type 2 diabetes (T2DM) patients. Zinc is an important essential trace metal, whose deficiency is associated with various chronic ailments, including vascular diseases. We assessed T2DM B6.BKS(D)-Leprdb/J (db/db) mice fed for six months on a normal diet containing three zinc levels (deficient, adequate, and supplemented), to explore the role of zinc in DCM development and progression. Cardiac function, reflected by ejection fraction, was significantly decreased, along with increased left ventricle mass and heart weight to tibial length ratio, in db/db mice...
March 7, 2017: International Journal of Molecular Sciences
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