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https://www.readbyqxmd.com/read/28241080/replication-of-cmv-in-the-gut-of-hiv-infected-individuals-and-epithelial-barrier-dysfunction
#1
Ekaterina Maidji, Ma Somsouk, Jose M Rivera, Peter W Hunt, Cheryl A Stoddart
Although invasive cytomegalovirus (CMV) disease is uncommon in the era of antiretroviral therapy (ART), asymptomatic CMV coinfection is nearly ubiquitous in HIV infected individuals. While microbial translocation and gut epithelial barrier dysfunction may promote persistent immune activation in treated HIV infection, potentially contributing to morbidity and mortality, it has been unclear whether CMV replication in individuals with no symptoms of CMV disease might play a role in this process. We hypothesized that persistent CMV replication in the intestinal epithelium of HIV/CMV-coinfected individuals impairs gut epithelial barrier function...
February 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28240164/effects-of-dietary-mycotoxins-on-gut-microbiome
#2
Kexin Du, Ping Liu, Yuan Li, Xi Ma
The harmful effects of mycotoxins on intestinal health have received worldwide attention. Mycotoxins are toxic secondary metabolites produced by filamentous fungi, and include aflatoxins, ochratoxins, patulin, fumonisins, zearalenone, trichothecenes, and ergot alkaloids. Insuring the absence or low levels of mycotoxins is critical for food and feed safety. Currently, the studies in this field have illuminated the adverse effects of mycotoxins on gut health including intestinal integrity and the gut-associated immune system...
February 22, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28238797/in%C3%A2-vitro-modeling-of-blood-brain-barrier-with-human-ipsc-derived-endothelial-cells-pericytes-neurons-and-astrocytes-via-notch-signaling
#3
Kohei Yamamizu, Mio Iwasaki, Hitomi Takakubo, Takumi Sakamoto, Takeshi Ikuno, Mami Miyoshi, Takayuki Kondo, Yoichi Nakao, Masato Nakagawa, Haruhisa Inoue, Jun K Yamashita
The blood-brain barrier (BBB) is composed of four cell populations, brain endothelial cells (BECs), pericytes, neurons, and astrocytes. Its role is to precisely regulate the microenvironment of the brain through selective substance crossing. Here we generated an in vitro model of the BBB by differentiating human induced pluripotent stem cells (hiPSCs) into all four populations. When the four hiPSC-derived populations were co-cultured, endothelial cells (ECs) were endowed with features consistent with BECs, including a high expression of nutrient transporters (CAT3, MFSD2A) and efflux transporters (ABCA1, BCRP, PGP, MRP5), and strong barrier function based on tight junctions...
February 20, 2017: Stem Cell Reports
https://www.readbyqxmd.com/read/28238709/occludin-expression-and-regulation-in-small-follicles-of-the-layer-and-broiler-breeder-hen
#4
C S Stephens, P A Johnson
Synchronized yolk accumulation and follicle development are essential for egg production in oviparous species. In birds, yolk is incorporated into the oocyte by an avian specific yolk receptor (LR8), and it has been suggested that occludin (OCLN), a tight junction protein, mediates transfer of yolk material to the oocyte surface. OCLN may be a key regulator of yolk accumulation and follicle growth, however, the expression and regulation of OCLN in granulosa cells during various stages of follicle development is unknown...
February 23, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28237889/giardia-duodenalis-induces-dysbiosis-of-human-intestinal-microbiota-biofilms
#5
Jennifer K Beatty, Sarah V Akierman, Jean-Paul Motta, Stacy Muise, Matthew L Workentine, Joe J Harrison, Amol Bhargava, Paul L Beck, Kevin P Rioux, Gordon Webb McKnight, John L Wallace, Andre G Buret
Giardia duodenalis is a prevalent cause of acute diarrheal disease worldwide. However, recent outbreaks in Italy and Norway have revealed a link between giardiasis and the subsequent development of chronic post-infectious irritable bowel syndrome (PI-IBS). While the mechanisms underlying the causation of PI-IBS remain obscure, recent findings suggest that alterations in gut microbiota communities are linked to the pathophysiology of IBS. In the present study, we use a laboratory biofilm system to culture and enrich mucosal microbiota from human intestinal biopsies...
February 22, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28237316/metabolite-transport-across-the-mammalian-and-insect-brain-diffusion-barriers
#6
Astrid Weiler, Anne Volkenhoff, Helen Hertenstein, Stefanie Schirmeier
The nervous system in higher vertebrates is separated from the circulation by a layer of specialized endothelial cells. It protects the sensitive neurons from harmful blood-derived substances, high and fluctuating ion concentrations, xenobiotics or even pathogens. To this end, the brain endothelial cells and their interlinking tight junctions build an efficient diffusion barrier. A structurally analogous diffusion barrier exists in insects, where glial cell layers separate the hemolymph from the neural cells...
February 22, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28237245/the-formation-of-quiescent-glomerular-endothelial-cell-monolayer-in-vitro-is-strongly-dependent-on-the-choice-of-extracellular-matrix-coating
#7
Kamilla Pajęcka, Malik Nygaard Nielsen, Troels Krarup Hansen, Julie M Williams
BACKGROUND AND AIMS: Nephropathy involves pathophysiological changes to the glomerulus. The primary glomerular endothelial cells (GEnCs) have emerged as an important tool for studying glomerulosclerotic mechanisms and in the screening process for drug-candidates. The success of the studies is dependent on the quality of the cell model. Therefore, we set out to establish an easy, reproducible model of the quiescent endothelial monolayer with the use of commercially available extracellular matrices (ECMs)...
February 22, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28235673/laquinimod-enhances-central-nervous-system-barrier-functions
#8
Fred Lühder, Hania Kebir, Francesca Odoardi, Tanja Litke, Maike Sonneck, Jorge Ivan Alvarez, Jan Winchenbach, Nadine Eckert, Liat Hayardeny, Ella Sorani, Dmitri Lodygin, Alexander Flügel, Alexandre Prat
Laquinimod is currently being tested as a therapeutic drug in multiple sclerosis. However, its exact mechanism of action is still under investigation. Tracking of fluorescently-tagged encephalitogenic T cells during experimental autoimmune encephalomyelitis (EAE), an animal model for multiple sclerosis, revealed that laquinimod significantly reduces the invasion of pathogenic effector T cells into the CNS tissue. T-cell activation, differentiation and amplification within secondary lymphoid organs after immunization with myelin antigen, their migratory capacity and re-activation within the nervous tissue were either only mildly affected or remained unchanged...
February 21, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28231640/mind-the-gap-mechanisms-regulating-the-endothelial-barrier
#9
REVIEW
Mariya Y Radeva, Jens Waschke
The endothelial barrier consists of intercellular contacts localized in the cleft between endothelial cells, which is covered by the glycocalyx in a sieve-like manner. Both types of barrier-forming junctions, i.e. the adherens junction (AJ) serving mechanical anchorage and mechanotransduction and the tight junction (TJ) sealing the intercellular space to limit paracelullar permeability, are tethered to the actin cytoskeleton. Under resting conditions, the endothelium thereby builds a selective layer controlling the exchange of fluid and solutes with the surrounding tissue...
February 23, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28230606/secretions-of-bifidobacterium-infantis-and-lactobacillus-acidophilus-protect-intestinal-epithelial-barrier-function
#10
Shuangshuang Guo, Tyler Gillingham, Yuming Guo, Di Meng, Weishu Zhu, W Allen Walker, Kriston Ganguli
OBJECTIVES: The secreted metabolites of probiotics are cytoprotective to intestinal epithelium and have been shown to attenuate inflammation and reduce gut permeability. The present study was designed to determine the protective effects of probiotic conditioned media (PCM) from Bifidobacterium infantis (BCM) and Lactobacillus acidophilus (LCM) on interleukin (IL)-1β-induced intestinal barrier compromise. METHODS: The epithelial barrier was determined by measuring the transepithelial electrical resistance (TER) across a Caco-2 cell monolayer using a Transwell model...
March 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28228623/elucidation-of-mechanism-of-blood-brain-barrier-damage-for-prevention-and-treatment-of-vascular-dementia
#11
Masaki Ueno
It is well-known that the blood-brain barrier (BBB) plays significant roles in transporting intravascular substances into the brain. The BBB in cerebral capillaries essentially impedes the influx of intravascular compounds from the blood to the brain, while nutritive substances, such as glucose, can be selectively transported through several types of influx transporters in endothelial cells. In the choroid plexus, intravascular substances can invade the parenchyma as fenestrations exist in endothelial cells of capillaries...
February 22, 2017: Rinshō Shinkeigaku, Clinical Neurology
https://www.readbyqxmd.com/read/28223360/a-novel-subtilase-inhibitor-in-plants-shows-structural-and-functional-similarities-to-protease-propeptides
#12
Mathias Hohl, Annick Stintzi, Andreas Schaller
The propeptides of subtilisin-like serine proteinases (SBTs) serve dual functions as intramolecular chaperones that are required for enzyme folding and as inhibitors of the mature proteases. SBT propeptides are homologous to the I9 family of protease inhibitors that have only been described in fungi. Here we report the identification and characterization of Subtilisin Propeptide-Like Inhibitor 1 (SPI-1) from Arabidopsis thaliana. Sequence similarity and the shared β-α-β-β-α-β core structure identified SPI-1 as a member of the I9 inhibitor family, and as the first independent I9 inhibitor in higher eukaryotes...
February 21, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28223245/potential-of-single-cationic-amino-acid-molecule-arginine-for-stimulating-oral-absorption-of-insulin
#13
Noriyasu Kamei, El-Sayed Khafagy, Jun Hirose, Mariko Takeda-Morishita
We have reported that cell-penetrating peptides, such as oligoarginine, act as powerful absorption enhancers for the development of oral insulin delivery systems. However, the minimal essential sequence of oligoarginine that stimulates intestinal insulin absorption remains unclear. Therefore, the present study was conducted to clarify this minimum sequence of oligoarginine and to examine the effect of single cationic amino acid arginine on the intestinal and oral absorption of insulin. The results demonstrated that a remarkable enhancement of intestinal insulin absorption was observed after coadministration of insulin with l-arginine...
February 18, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28223118/characterization-of-the-dinophysistoxin-2-acute-oral-toxicity-in-mice-to-define-the-toxicity-equivalency-factor
#14
Paula Abal, M Carmen Louzao, José Manuel Cifuentes, Natalia Vilariño, Ines Rodriguez, Amparo Alfonso, Mercedes R Vieytes, Luis M Botana
Ingestion of shellfish with dinophysistoxin-2 (DTX2) can lead to diarrheic shellfish poisoning (DSP). The official control method of DSP toxins in seafood is the liquid chromatography-mass spectrometry analysis (LC-MS). However in order to calculate the total toxicity of shellfish, the concentration of each compound must be multiplied by individual Toxicity Equivalency Factor (TEF). Considering that TEFs caused some controversy and the scarce information about DTX2 toxicity, the aim of this study was to characterize the oral toxicity of DTX2 in mice...
February 20, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28222445/blocking-il-17a-alleviates-diabetic-retinopathy-in-rodents
#15
Ao-Wang Qiu, Qing-Huai Liu, Jun-Ling Wang
BACKGROUND/AIMS: Interleukin (IL)-17A, a proinflammatory cytokine, has been implicated in several autoimmune diseases. However, it is unclear whether IL-17A is involved in diabetic retinopathy (DR), one of the most serious complications of autoimmune diabetes. This study aimed to demonstrate that IL-17A exacerbates DR by affecting retinal Müller cell function. METHODS: High glucose (HG)-treated rat Müller cell line (rMC-1) was exposed to IL-17A, anti-IL-17A-neutralizing monoclonal antibody (mAb) or/and anti-IL-17 receptor (R)A-neutralizing mAb for 24 h...
February 21, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28222093/active-zone-proteins-are-transported-via-distinct-mechanisms-regulated-by-par-1-kinase
#16
Kara R Barber, Julia Tanquary, Keegan Bush, Amanda Shaw, Michael Woodson, Michael Sherman, Yogesh P Wairkar
Disruption of synapses underlies a plethora of neurodevelopmental and neurodegenerative disease. Presynaptic specialization called the active zone plays a critical role in the communication with postsynaptic neuron. While the role of many proteins at the active zones in synaptic communication is relatively well studied, very little is known about how these proteins are transported to the synapses. For example, are there distinct mechanisms for the transport of active zone components or are they all transported in the same transport vesicle? Is active zone protein transport regulated? In this report we show that overexpression of Par-1/MARK kinase, a protein whose misregulation has been implicated in Autism spectrum disorders (ASDs) and neurodegenerative disorders, lead to a specific block in the transport of an active zone protein component- Bruchpilot at Drosophila neuromuscular junctions...
February 21, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28220498/the-role-of-apical-cell-cell-junctions-and-associated-cytoskeleton-in-mechanotransduction
#17
REVIEW
Sophie Sluysmans, Ekaterina Vasileva, Domenica Spadaro, Jimit Shah, Florian Rouaud, Sandra Citi
Tissues of multicellular organisms are characterized by several types of specialized cell-cell junctions. In vertebrate epithelia and endothelia, tight and adherens junctions play critical roles in barrier and adhesion functions, and are connected to the actin and microtubule cytoskeletons. The interaction between junctions and the cytoskeleton is crucial for tissue development and physiology, and is involved in the molecular mechanisms governing cell shape, motility, growth and signaling. The machineries which functionally connect tight and adherens junctions to the cytoskeleton comprise proteins which either bind directly to cytoskeletal filaments, or function as adaptors for regulators of the assembly and function of the cytoskeleton...
February 21, 2017: Biology of the Cell
https://www.readbyqxmd.com/read/28219400/alleviation-of-secondary-brain-injury-posttraumatic-inflammation-and-brain-edema-formation-by-inhibition-of-factor-xiia
#18
Sarah Hopp, Marc W Nolte, Christian Stetter, Christoph Kleinschnitz, Anna-Leena Sirén, Christiane Albert-Weissenberger
BACKGROUND: Traumatic brain injury (TBI) is a devastating neurological condition and a frequent cause of permanent disability. Posttraumatic inflammation and brain edema formation, two pathological key events contributing to secondary brain injury, are mediated by the contact-kinin system. Activation of this pathway in the plasma is triggered by activated factor XII. Hence, we set out to study in detail the influence of activated factor XII on the abovementioned pathophysiological features of TBI...
February 20, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28218451/specific-inulin-type-fructan-fibers-protect-against-autoimmune-diabetes-by-modulating-gut-immunity-barrier-function-and-microbiota-homeostasis
#19
Kang Chen, Hao Chen, Marijke M Faas, Bart J de Haan, Jiahong Li, Ping Xiao, Hao Zhang, Julien Diana, Paul de Vos, Jia Sun
SCOPE: Dietary fibers capable of modifying gut barrier and microbiota homeostasis, affect the progression of type 1 diabetes (T1D). Here we aim to compare modulatory effects of inulin-type fructans (ITFs), natural soluble dietary fibers with different degrees of fermentability from chicory root, on T1D development in non-obese diabetic (NOD) mice. METHODS AND RESULTS: Female NOD mice were weaned to long and short chain ITFs [ITF(l) and ITF(s), 5%] supplemented diet up to 24 weeks...
February 20, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28218448/chronic-supplementation-with-dietary-proanthocyanidins-protects-from-diet-induced-intestinal-alterations-in-obese-rats
#20
Gil-Cardoso Katherine, Ginés Iris, Pinent Montserrat, Ardévol Anna, Arola Lluís, Blay Mayte, Terra Ximena
SCOPE: Increased attention has been paid to the link between altered intestinal function and elevated incidence of metabolic disorders, such as in obesity. The present study investigated in obese rats the role of grape seed proanthocyanidin extract (GSPE) chronic treatment, taken in a low, moderate or high dose, on obesity-associated intestinal alterations in response to a cafeteria diet (CAF). METHODS AND RESULTS: To evaluate the degree of intestinal inflammation, ROS production and MPO activity were measured as well as the expression of inflammatory related genes...
February 20, 2017: Molecular Nutrition & Food Research
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