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https://www.readbyqxmd.com/read/29166613/niche-cadherins-control-the-quiescence-to-activation-transition-in-muscle-stem-cells
#1
Aviva J Goel, Marysia-Kolbe Rieder, Hans-Henning Arnold, Glenn L Radice, Robert S Krauss
Many adult stem cells display prolonged quiescence, promoted by cues from their niche. Upon tissue damage, a coordinated transition to the activated state is required because non-physiological breaks in quiescence often lead to stem cell depletion and impaired regeneration. Here, we identify cadherin-mediated adhesion and signaling between muscle stem cells (satellite cells [SCs]) and their myofiber niche as a mechanism that orchestrates the quiescence-to-activation transition. Conditional removal of N-cadherin and M-cadherin in mice leads to a break in SC quiescence, with long-term expansion of a regeneration-proficient SC pool...
November 21, 2017: Cell Reports
https://www.readbyqxmd.com/read/29166603/caveolin1-is-required-for-th1-cell-infiltration-but-not-tight-junction-remodeling-at-the-blood-brain-barrier-in-autoimmune-neuroinflammation
#2
Sarah E Lutz, Julian R Smith, Dae Hwan Kim, Carl V L Olson, Kyle Ellefsen, Jennifer M Bates, Sunil P Gandhi, Dritan Agalliu
Lymphocytes cross vascular boundaries via either disrupted tight junctions (TJs) or caveolae to induce tissue inflammation. In the CNS, Th17 lymphocytes cross the blood-brain barrier (BBB) before Th1 cells; yet this differential crossing is poorly understood. We have used intravital two-photon imaging of the spinal cord in wild-type and caveolae-deficient mice with fluorescently labeled endothelial tight junctions to determine how tight junction remodeling and caveolae regulate CNS entry of lymphocytes during the experimental autoimmune encephalomyelitis (EAE) model for multiple sclerosis...
November 21, 2017: Cell Reports
https://www.readbyqxmd.com/read/29166329/pseudolesions-impersonating-osseous-tumor-involvement-on-both-contrast-enhanced-ct-and-fdg-pet-ct
#3
Jessica K Peterson, Rustain L Morgan, Joseph S Donald, Mark A Perry
A 27-year-old man with stage IV-B Hodgkin's lymphoma status post autologous peripheral stem cell transplant in 2015 with complete response, presented in 2017 with increasing back pain. Restaging contrast enhanced CT demonstrated left brachiocephalic vein occlusion with peripheral nodular high density areas within C7-T2 vertebral bodies with corresponding radiotracer uptake on same day PET/CT. No matching lesion was seen on noncontrast CT. Findings were consistent with pooling of contrast and radiotracer within vertebral venous plexus collaterals at the cervicothoracic junction secondary to brachiocephalic vein occlusion...
November 22, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/29164815/application-of-kartogenin-for-musculoskeletal-regeneration
#4
REVIEW
Gun-Il Im
Kartogenin (KGN) is a recently characterized small molecule that promotes the selective differentiation of mesenchymal stem cells into chondrocytes, and thus, KGN stimulates cartilage regeneration. KGN also possess chondro-protective effect. Furthermore, because it is highly stable small molecule, KGN can be stored and transported at room temperature. These obvious superiorities over peptide growth factors make KGN a desirable chondrogenic agent for cartilage regeneration. Since its discovery, KGN has drawn much attention as a new chondrogenic drug for intraarticular (IA) treatment...
November 22, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29164766/down-regulating-myoferlin-inhibits-the-vasculogenic-mimicry-of%C3%A2-melanoma-via-decreasing-mmp-2-and-inducing-mesenchymal-to-epithelial-transition
#5
Wenxue Zhang, Ping Zhou, Ai Meng, Rongxin Zhang, Yan Zhou
Vasculogenic mimicry (VM) constitutes a novel approach for tumour blood supply and contributes to tumour metastasis and poor prognosis in patients with melanoma. Myoferlin (MYOF), a type II membrane protein involved in membrane regeneration and repair, is elevated in several malignant tumours, especially in advanced melanomas. This study aims to investigate the role and mechanism of MYOF in the regulation of VM. VM structures were found in 14 of 52 tested melanoma samples, and high MYOF expression correlated with VM structures...
November 22, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/29164306/a-structure-activity-relationship-linking-non-planar-pcbs-to-functional-deficits-of-neural-crest-cells-new-roles-for-connexins
#6
Johanna Nyffeler, Petra Chovancova, Xenia Dolde, Anna-Katharina Holzer, Vladimir Purvanov, Ilona Kindinger, Anna Kerins, David Higton, Steve Silvester, Barbara M A van Vugt-Lussenburg, Enrico Glaab, Bart van der Burg, Richard Maclennan, Daniel F Legler, Marcel Leist
Migration of neural crest cells (NCC) is a fundamental developmental process, and test methods to identify interfering toxicants have been developed. By examining cell function endpoints, as in the 'migration-inhibition of NCC (cMINC)' assay, a large number of toxicity mechanisms and protein targets can be covered. However, the key events that lead to the adverse effects of a given chemical or group of related compounds are hard to elucidate. To address this issue, we explored here, whether the establishment of two overlapping structure-activity relationships (SAR)-linking chemical structure on the one hand to a phenotypic test outcome, and on the other hand to a mechanistic endpoint-was useful as strategy to identify relevant toxicity mechanisms...
November 21, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/29163827/fluorescence-contrast-enhanced-proliferative-lesion-imaging-by-enema-administration-of-indocyanine-green-in-a-rat-model-of-colon-carcinogenesis
#7
Nobuhiko Onda, Reiko Mizutani-Morita, Susumu Yamashita, Rei Nagahara, Shinya Matsumoto, Toshinori Yoshida, Makoto Shibutani
The fluorescent contrast agent indocyanine green (ICG) is approved by the Food and Drug Administration for clinical applications. We previously reported that cultured human colon tumor cells preferentially take up ICG by endocytic activity in association with disruption of their tight junctions. The present study explored ICG availability in fluorescence imaging of the colon to identify proliferative lesions during colonoscopy. The cellular uptake of ICG in cultured rat colon tumor cells was examined using live-cell imaging...
October 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/29163229/cx43-isoform-gja1-20k-promotes-microtubule-dependent-mitochondrial-transport
#8
Ying Fu, Shan-Shan Zhang, Shaohua Xiao, Wassim A Basheer, Rachel Baum, Irina Epifantseva, TingTing Hong, Robin M Shaw
Connexin 43 (Cx43, encoded by GJA1) is a cell-cell communication gap junction protein expressed in all organ systems. It was recently found that GJA1 mRNA undergoes alternative translation to generate N-terminal truncated isoforms, of which GJA1-20k is the most abundant. Here we report a surprising finding that, unlike full length GJA1-43k, GJA1-20k has a strong tropism for mitochondria. Exploring function, we found that GJA1-20k appears to be an organelle chaperone and that overexpression of GJA1-20k is sufficient to rescue mitochondrial localization to the cell periphery upon exposure to hydrogen peroxide, which effectively limits the network fragmentation that occurs with oxidative stress...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29163167/experimental-evaluation-of-the-transport-mechanisms-of-poifn-%C3%AE-in-caco-2-cells
#9
Xin Liu, Sidi Zheng, Yue Qin, Wenya Ding, Yabin Tu, Xingru Chen, Yunzhou Wu, Li Yanhua, Xuehui Cai
For the development of an efficient intestinal delivery system for Porcine interferon-α (PoIFN-α), the understanding of transport mechanisms of which in the intestinal cell is essential. In this study, we investigated the absorption mechanisms of PoIFN-α in intestine cells. Caco-2 cells and fluorescein isothiocyanate-labeled (FITC)-PoIFN-α were used to explore the whole transport process, including endocytosis, intracellular trafficking, exocytosis, and transcytosis. Via various techniques, the transport pathways of PoIFN-α in Caco-2 cells and the mechanisms were clarified...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29163061/cyclodextrins-and-iatrogenic-hearing-loss-new-drugs-with-significant-risk
#10
REVIEW
Mark A Crumling, Kelly A King, R Keith Duncan
Cyclodextrins are a family of cyclic oligosaccharides with widespread usage in medicine, industry and basic sciences owing to their ability to solubilize and stabilize guest compounds. In medicine, cyclodextrins primarily act as a complexing vehicle and consequently serve as powerful drug delivery agents. Recently, uncomplexed cyclodextrins have emerged as potent therapeutic compounds in their own right, based on their ability to sequester and mobilize cellular lipids. In particular, 2-hydroxypropyl-β-cyclodextrin (HPβCD) has garnered attention because of its cholesterol chelating properties, which appear to treat a rare neurodegenerative disorder and to promote atherosclerosis regression related to stroke and heart disease...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29162902/shear-stress-regulates-trpv4-channel-clustering-and-translocation-from-adherens-junctions-to-the-basal-membrane
#11
Sara Baratchi, Markus Knoerzer, Khashayar Khoshmanesh, Arnan Mitchell, Peter McIntyre
Localized Ca(2+) influx via TRPV4 on the surface of endothelial cells greatly influences endothelial adaptation to blood flow, but how mechanical stress from blood flow controls TRPV4 integration into this physiological function is not fully understood. Here, we studied the spatial organization of TRPV4 and its relationship to the adherens junction component β-catenin using single- and dual-color direct stochastic optical reconstruction microscopy (dSTORM). In non-stimulated endothelial cells, TRPV4 is clustered in small protein islands, as is β-catenin...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29162704/tropomyosin-related-kinase-c-trkc-enhances-podocyte-migration-by-erk-mediated-wave2-activation
#12
Sascha Gromnitza, Carolin Lepa, Thomas Weide, Albrecht Schwab, Hermann Pavenstädt, Britta George
Podocyte malfunction is central to glomerular diseases and is marked by defective podocyte intercellular junctions and actin cytoskeletal dynamics. Podocytes share many morphologic features with neurons, so that similar sets of proteins appear to regulate cell process formation. One such protein is the tropomyosin-related kinase C (TrkC). TrkC deficiency in mice leads to proteinuria as a surrogate of defective kidney filter function. Activation of endogenous TrkC by its ligand neurotrophin-3 resulted in increased podocyte migration-a surrogate of podocyte actin dynamics in vivo Employing a mutagenesis approach, we found that the Src homologous and collagen-like (Shc) binding site Tyr(516) within the TrkC cytoplasmic domain was necessary for TrkC-induced migration of podocytes...
November 21, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29162451/hydrostatic-pressure-incubation-affects-barrier-properties-of-mammary-epithelial-cell-monolayers-in-vitro
#13
Katharina S Mießler, Alexander G Markov, Salah Amasheh
During lactation, accumulation of milk in mammary glands (MG) causes hydrostatic pressure (HP) and concentration of bioactive compounds. Previously, a changed expression of tight junction (TJ) proteins was observed in mice MGs by accumulation of milk, in vivo. The TJ primarily determines the integrity of the MG epithelium. The present study questioned whether HP alone can affect the TJ in a mammary epithelial cell model, in vitro. Therefore, monolayers of HC11, a mammary epithelial cell line, were mounted into modified Ussing chambers and incubated with 10 kPa bilateral HP for 4 h...
November 18, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29162374/the-efficiency-and-mechanism-of-n-octyl-o-n-carboxymethyl-chitosan-based-micelles-to-enhance-the-oral-absorption-of-silybin
#14
Tingjie Yin, Ying Zhang, Yanhong Liu, Qinyu Chen, Ying Fu, Jinlai Liang, Jianping Zhou, Xiaomeng Tang, Jiyong Liu, Meirong Huo
This study demonstrates the preparation of a silybin-loaded N-octyl-O, N-carboxymethyl chitosan micelle (OCC-SLB) to enhance the oral absorption efficiency of silybin (SLB) and investigate the related mechanisms of enhancement. Firstly, the physicochemical properties of OCC and OCC-SLB micelles, including critical micelle concentration (CMC), particle size, zeta potential, drug-loading, etc., were determined. Results of pharmacokinetic studies on rats then confirmed a desirable enhancement in the oral bioavailability of SLB by OCC-SLB micelles compared with a stock SLB suspension solution...
November 18, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29162294/early-detection-of-acute-tubulointerstitial-nephritis-in-the-genesis-of-mesoamerican-nephropathy
#15
Rebecca S B Fischer, Chandan Vangala, Luan Truong, Sreedhar Mandayam, Denis Chavarria, Orlando M Granera Llanes, Marcos U Fonseca Laguna, Alvaro Guerra Baez, Felix Garcia, Ramón García-Trabanino, Kristy O Murray
Mesoamerican nephropathy is a devastating disease of unknown etiology that affects mostly young agricultural workers in Central America. An understanding of the mechanism of injury and the early disease process is urgently needed and will aid in identification of the underlying cause and direct treatment and prevention efforts. We sought to describe the renal pathology in Mesoamerican nephropathy at its earliest clinical appearance in prospectively identified acute case patients in Nicaragua. We considered those with elevated (or increased at least 0...
November 18, 2017: Kidney International
https://www.readbyqxmd.com/read/29161515/potential-profile-of-stabilized-field-induced-lateral-p-n-junction-in-transition-metal-dichalcogenides
#16
Yijin Zhang, Ryuji Suzuki, Yoshihiro Iwasa
Electric field-induced p-n junctions are often used to realize peculiar functionalities in various materials. This method can be applied not only to conventional semiconductors but also to carbon nanotubes, graphene, and organic semiconductors to which the conventional chemical doping method is difficult to be applied. Transition-metal dichalcogenides (TMDs) are one of such materials where the field-induced p-n junctions play crucial roles in realizing solar cell and light-emitting diode operations as well as circularly polarized electroluminescence...
November 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/29160910/epithelial-disruptions-but-not-immune-cell-invasion-induced-secretory-dysfunction-following-innate-immune-activation-in-a-novel-model-of-acute-salivary-gland-injury
#17
Abeer Shaalan, Guy Carpenter, Gordon Proctor
BACKGROUND: Salivary gland (SG) injurious agents are all translated into loss of salivation (xerostomia). An association has been established between activation of innate immunity and salivary gland injury and dysfunction. However, it remains unclear how the secretory epithelia respond by halting saliva production. METHODS: C57BL/6 submandibular glands (SMGs) were acutely challenged using a single dose of the innate immune stimulant: polyinosinic-polycytidylic acid (poly (I:C))...
November 21, 2017: Journal of Oral Pathology & Medicine
https://www.readbyqxmd.com/read/29160905/regulated-recruitment-of-srgap1-modulates-rhoa-signaling-for-contractility-during-epithelial-junction-maturation
#18
Xuan Liang, Sajini Kiru, Guillermo A Gomez, Alpha S Yap
Adherens junctions in epithelia are contractile structures, where coupling of adhesion to the actomyosin cytoskeleton generates mechanical tension for morphogenesis and homeostasis. In established monolayers, junctional contractility is supported by the interplay between cell signals and scaffolding proteins. However, less is known about how contractile junctions develop, especially during the establishment of epithelial monolayers. Here we show that junctional tension increases concomitant with accumulation of actomyosin networks as Caco-2 epithelia become confluent...
November 21, 2017: Cytoskeleton
https://www.readbyqxmd.com/read/29159771/cldn6-enhances-chemoresistance-to-adm-via-af-6-erks-pathway-in-tnbc-cell-line-mdamb231
#19
Minlan Yang, Yanru Li, Yang Ruan, Yan Lu, Dongjing Lin, Yinping Xie, Bing Dong, Qihua Dang, Chengshi Quan
Claudin-6 (CLDN6), a critical tight junction protein acting as a tumor suppressor in breast cancer, is also considered to be a stem cell marker. Triple-negative breast cancer (TNBC) is a subtype of claudin-low and stem cell-like breast cancer which is chemoresistant to multiple anti-cancer drugs. The aim of our study was to determine whether CLDN6 plays a role in chemoresistance of TNBC. We found that overexpression of CLDN6 in TNBC cell line MDAMB231 significantly inhibited cell growth, migration, and invasion...
November 20, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/29158642/insights-into-nuclear-dna-content-hydrogen-peroxide-and-antioxidative-enzyme-activities-during-transverse-thin-cell-layer-organogenesis-and-ex-vitro-acclimatization-of-malaxis-wallichii-a-threatened-medicinal-orchid
#20
Biswajit Bose, Suman Kumaria, Hiranjit Choudhury, Pramod Tandon
Malaxis wallichii (Lindl.) Deb, a small, perennial, monopodial, terrestrial orchid, is endemic to tropical Himalayas at an altitude of 1200-2000 m asl. The pseudobulbs are important ingredients of century old drug 'Ashtavarga' and a polyherbal energetic tonic 'Chyavanprash'. An efficient genetically stable in vitro propagation protocol using transverse thin cell layer culture system was established for M. wallichii. In the present report, meta-topolin alone proved to be three times more beneficial compared to other routinely used cytokinins in inducing highest number of shoot buds, plant height and growth of regenerated shoots...
October 2017: Physiology and Molecular Biology of Plants: An International Journal of Functional Plant Biology
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