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Extracellular Histones

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https://www.readbyqxmd.com/read/28931541/molecular-mechanisms-involved-in-the-adaptive-regulation-of-colonic-thiamin-pyrophosphate-tpp-uptake-process
#1
Kasin Yadunandam Anandam, Padmanabhan Srinivasan, Veedamali S Subramanian, Hamid M Said
A considerable amount of the thiamin generated by gut microbiota exists in the form of thiamin pyrophosphate (TPP). We have previously shown that human colonocytes possess an efficient carrier-mediated uptake process for TPP that involves the SLC44A4 system and this uptake process is adaptively-regulated by prevailing extracellular TPP level. Little is known about the molecular mechanisms that mediate this adaptive regulation. We addressed this issue using human-derived colonic epithelial NCM460 cells and mouse colonoids as models...
September 20, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28929912/in%C3%A2-vivo-induction-of-neutrophil-extracellular-traps-by-mycobacterium-tuberculosis-in-a-guinea-pig-model
#2
Georgina Filio-Rodríguez, Iris Estrada-García, Patricia Arce-Paredes, María M Moreno-Altamirano, Sergio Islas-Trujillo, M Dolores Ponce-Regalado, Oscar Rojas-Espinosa
In 2004, a novel mechanism of cellular death, called 'NETosis', was described in neutrophils. This mechanism, different from necrosis and apoptosis, is characterized by the release of chromatin webs admixed with microbicidal granular proteins and peptides (NETs). NETs trap and kill a variety of microorganisms. Diverse microorganisms, including Mycobacterium tuberculosis, are NET inducers in vitro. The aim of this study was to examine whether M. tuberculosis can also induce NETs in vivo and if the NETs are bactericidal to the microorganism...
January 1, 2017: Innate Immunity
https://www.readbyqxmd.com/read/28919888/the-sporothrix-schenckii-gene-encoding-for-the-ribosomal-protein-l6-has-constitutive-and-stable-expression-and-works-as-an-endogenous-control-in-gene-expression-analysis
#3
Elías Trujillo-Esquivel, José A Martínez-Álvarez, Diana M Clavijo-Giraldo, Nahúm V Hernández, Alberto Flores-Martínez, Patricia Ponce-Noyola, Héctor M Mora-Montes
Sporothrix schenckii is one of the causative agents of sporotrichosis, a worldwide-distributed mycosis that affects humans and other mammals. The interest in basic and clinical features of this organism has significantly increased in the last years, yet little progress in molecular aspects has been reported. Gene expression analysis is a set of powerful tools that helps to assess the cell response to changes in the extracellular environment, the genetic networks controlling metabolic pathways, and the adaptation to different growth conditions...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28899682/caveolin-1-controls-hyperresponsiveness-to-mechanical-stimuli-and-fibrogenesis-associated-runx2-activation-in-keloid-fibroblasts
#4
Chao-Kai Hsu, Hsi-Hui Lin, Hans I-Chen Harn, Rei Ogawa, Yang-Kao Wang, Yen-Ting Ho, Wan-Rung Chen, Yi-Chao Lee, Julia Yu-Yun Lee, Shyh-Jou Shieh, Chao-Min Cheng, John A McGrath, Ming-Jer Tang
Keloids are pathological scars characterized by excessive extracellular matrix production that are prone to form in body sites with increased skin tension. Caveolin-1 (CAV1), the principal coat protein of caveolae, has been associated with the regulation of cell mechanics, including cell softening and loss of stiffness sensing ability in NIH3T3 fibroblasts. Although CAV1 is present in low amounts in keloid fibroblasts (KFs), the causal association between CAV1 downregulation and its aberrant responses to mechanical stimuli remain unclear...
September 9, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28895052/the-effects-of-periostin-in-a-rat-model-of-isoproterenol-mediated-cardiotoxicity
#5
Mahmut Sözmen, Alparslan K Devrim, Yonca B Kabak, Tuba Devrim, Mert Sudagidan
Periostin is an extracellular matrix protein from fasciclin family, and it plays an important role in the cell adhesion, migration, and growth of the organism. Periostin prevents apoptosis while stimulating cardiomyocytes. The present study was designed to investigate cardioprotective effects of the recombinant murine periostin peptide administration in a rat model of isoproterenol (ISO)-induced myocardial injury. The experiment was performed on 84 adult male Sprague Dawley rats in 4 groups (n = 21): control group (1), periostin-treated group (2), ISO-treated group (3), and ISO + periostin-treated group (4)...
September 11, 2017: Cardiovascular Toxicology
https://www.readbyqxmd.com/read/28883660/chromatin-remodeling-system-p300-hdac2-sin3a-is-involved-in-arginine-starvation-induced-hif-1%C3%AE-degradation-at-the-ass1-promoter-for-ass1-derepression
#6
Wen-Bin Tsai, Yan Long, Jeffrey T Chang, Niramol Savaraj, Lynn G Feun, Manfred Jung, Helen H W Chen, Macus Tien Kuo
Argininosuccinate synthetase 1 (ASS1) is the key enzyme that controls biosynthesis of arginine (Arg). ASS1 is silenced in many human malignancies therefore, these tumors require extracellular Arg for growth. The Arg-degrading recombinant protein, pegylated arginine deiminase (ADI-PEG20), has been in clinical trials for targeting Arg auxotrophic tumors by Arg starvation therapy. Resistance to Arg starvation is often developed through reactivation of ASS1 expression. We previously demonstrated that ASS1 silencing is controlled by HIF-1α and Arg starvation-reactivated ASS1 is associated with HIF-1α downregulation...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28878348/foxf1-transcription-factor-promotes-lung-regeneration-after-partial-pneumonectomy
#7
Craig Bolte, Hannah M Flood, Xiaomeng Ren, Sajjeev Jagannathan, Artem Barski, Tanya V Kalin, Vladimir V Kalinichenko
FOXF1, a member of the forkhead box family of transcription factors, has been previously shown to be critical for lung development, homeostasis, and injury responses. However, the role of FOXF1 in lung regeneration is unknown. Herein, we performed partial pneumonectomy, a model of lung regeneration, in mice lacking one Foxf1 allele in endothelial cells (PDGFb-iCre/Foxf1 (fl/+) mice). Endothelial cell proliferation was significantly reduced in regenerating lungs from mice deficient for endothelial Foxf1. Decreased endothelial proliferation was associated with delayed lung regeneration as shown by reduced respiratory volume in Foxf1-deficient lungs...
September 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28865478/extracellular-histones-are-clinically-relevant-mediators-in-the-pathogenesis-of-acute-respiratory-distress-syndrome
#8
Xin Lv, Tao Wen, Jiong Song, Dong Xie, Liang Wu, Xuemei Jiang, Ping Jiang, Zongmei Wen
BACKGROUND: Extracellular histones were recently identified as an inflammatory mediator involved in the pathogenesis of various organ injuries. This study aimed to examine extracellular histone levels and their clinical implications in acute respiratory distress syndrome (ARDS) patients and to explore histone-mediated effects through ex-vivo investigations. METHODS: Extracellular histones, cytokine profiles and clinical data from 96 ARDS patients and 30 healthy volunteers were obtained...
September 2, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28861164/danggui-buxue-tang-suppresses-high-glucose-induced-proliferation-and-extracellular-matrix-accumulation-of-mesangial-cells-via-inhibiting-lncrna-pvt1
#9
Rui Zhang, Jinbo Li, Tao Huang, Xiuge Wang
BACKGROUND: Danggui Buxue Tang (DBT), a traditional Chinese medicine decoction, has been proven to have satisfactory effects on treating diabetic nephropathy (DN). In this study, we explored the potential underlying mechanism of DBT in DN treatment. METHODS: The DBT-containning serum was prepared by intragastric administration with DBT for rats. The levels of fibronectin (FN), laminin (LN) and collagen IV (COL IV) and TGF-β1 protein secreted in cell culture medium were determined by ELISA assay...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28861083/d-lactic-acid-induced-adhesion-of-bovine-neutrophils-onto-endothelial-cells-is-dependent-on-neutrophils-extracellular-traps-formation-and-cd11b-expression
#10
Pablo Alarcón, Carolina Manosalva, Ivan Conejeros, María D Carretta, Tamara Muñoz-Caro, Liliana M R Silva, Anja Taubert, Carlos Hermosilla, María A Hidalgo, Rafael A Burgos
Bovine ruminal acidosis is of economic importance as it contributes to reduced milk and meat production. This phenomenon is mainly attributed to an overload of highly fermentable carbohydrate, resulting in increased d(-) lactic acid levels in serum and plasma. Ruminal acidosis correlates with elevated acute phase proteins in blood, along with neutrophil activation and infiltration into various tissues leading to laminitis and aseptic polysynovitis. Previous studies in bovine neutrophils indicated that d(-) lactic acid decreased expression of L-selectin and increased expression of CD11b to concentrations higher than 6 mM, suggesting a potential role in neutrophil adhesion onto endothelia...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28860353/histone-deacetylase-hdac-inhibitors-relax-mouse-aorta-partly-by-their-inhibitory-action-on-l-type-ca2-channels
#11
Changbo Zheng, Mingkui Zhong, Zenghua Qi, Fan Shen, Qiannan Zhao, Lulu Wu, Yu Huang, Suk-Ying Tsang, Xiaoqiang Yao
Histone deacetylase (HDAC) inhibitors modulate acetylation/deacetylation of histone and non-histone proteins. They have been widely used for cancer treatment. However, there are only a few reports investigating the effect of HDAC inhibitors on vascular tone regulation, most of which involves chronic treatment with HDAC inhibitors. In the present study, we found that two hydroxamate-based pan-HDAC inhibitors suberoylanilide hydroxamic acid (SAHA) and trichostatin A (TSA) could partially but acutely relax the high extracellular K+-induced contraction of mouse aortas...
August 31, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28846832/induction-of-a-novel-isoform-of-the-lncrna-hotair-in-claudin-low-breast-cancer-cells-attached-to-extracellular-matrix
#12
Miao Li, Xi Li, Yan Zhuang, Erik K Flemington, Lin Zhen, Bin Shan
Elevated overexpression of the lncRNA HOTAIR mediates invasion and metastasis in breast cancer. In an apparent paradox, we observed low expression of HOTAIR in the invasive Claudin-low MDA-MB-231 and Hs578T cells in two-dimensional culture (2D). However, HOTAIR expression exhibited robust induction in laminin-rich extracellular matrix based three-dimensional organotypic culture (lrECM 3D) over that in 2D culture. Induction of HOTAIR required intact ECM signaling, namely integrin α2 and SRC kinase activity...
August 28, 2017: Molecular Oncology
https://www.readbyqxmd.com/read/28846729/histones-bundle-f-actin-filaments-and-affect-actin-structure
#13
Edna Blotnick, Asaf Sol, Andras Muhlrad
Histones are small polycationic proteins complexed with DNA located in the cell nucleus. Upon apoptosis they are secreted from the cells and react with extracellular polyanionic compounds. Actin which is a polyanionic protein, is also secreted from necrotic cells and interacts with histones. We showed that both histone mixture (histone type III) and the recombinant H2A histone bundles F-actin, increases the viscosity of the F-actin containing solution and polymerizes G-actin. The histone-actin bundles are relatively insensitive to increase of ionic strength, unlike other polycation, histatin, lysozyme, spermine and LL-37 induced F-actin bundles...
2017: PloS One
https://www.readbyqxmd.com/read/28844308/inflammation-and-regeneration-in-the-dentin-pulp-complex-net-gain-or-net-loss
#14
Paul R Cooper, Ilaria J Chicca, Michael J Holder, Michael R Milward
The balance between the immune/inflammatory and regenerative responses in the diseased pulp is central to the clinical outcome, and this response is unique within the body because of its tissue site. Cariogenic bacteria invade the dentin and pulp tissues, triggering molecular and cellular events dependent on the disease stage. At the early onset, odontoblasts respond to bacterial components in an attempt to protect the tooth's hard and soft tissues and limit disease progression. However, as disease advances, the odontoblasts die, and cells central to the pulp core, including resident immune cells, pulpal fibroblasts, endothelial cells, and stem cells, respond to the bacterial challenge via their expression of a range of pattern recognition receptors that identify pathogen-associated molecular patterns...
September 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28844099/epigenetic-silencing-of-prss3-provides-growth-and-metastasis-advantage-for-human-hepatocellular-carcinoma
#15
Bonan Lin, Xiaomeng Zhou, Shuye Lin, Xiaoyue Wang, Meiying Zhang, Baoping Cao, Yan Dong, Shuai Yang, Ji Ming Wang, Mingzhou Guo, Jiaqiang Huang
Protease, serine, 3 (PRSS3), a member of the trypsin family of serine proteases, has been shown to be aberrantly expressed in several cancer types and to play important roles in tumor progression and metastasis. However, the expression and function of PRSS3 gene in hepatocellular carcinoma (HCC) remain unclear. Here we found that PRSS3 expression was decreased in human HCC cell lines and HCC surgical specimens. This was associated with intragenic methylation of PRSS3 gene. Treatment with DNA methyltransferase inhibitor 5-aza-2'-deoxycytidine and/or histone deacetylase inhibitor trichostatin A restored PRSS3 expression in HCC cell lines...
August 26, 2017: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
https://www.readbyqxmd.com/read/28842426/neutrophil-extracellular-traps-are-critical-for-pregnancy-loss-in-sphingosine-kinase-deficient-mice-on-129sv-c57bl-6-background
#16
Kiyomi Mizugishi, Kouhei Yamashita
Exaggerated maternal immune responses must be strictly controlled to ensure a successful pregnancy. Neutrophil extracellular traps (NETs) have recently been implicated as a potential mechanism for promoting inflammation in pregnancy-related disorders. In this study, we demonstrated that NETs play a key role in the pathogenesis of sphingosine kinase (Sphk)-mediated pregnancy loss. Perturbing the sphingolipid pathway by disrupting Sphk genes during pregnancy led to excessive NET formation exclusively at the fetomaternal interface and early fetal death...
August 21, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28837206/neutrophil-extracellular-traps-are-increased-in-patients-with-acute-ischemic-stroke-prognostic-significance
#17
Juana Vallés, Aída Lago, María Teresa Santos, Ana María Latorre, Jose Tembl, Juan B Salom, Candela Nieves, Antonio Moscardó
Neutrophil extracellular traps (NETs) are networks of DNA, histones, and proteolytic enzymes produced by activated neutrophils through different mechanisms. NET formation is promoted by activated platelets and can in turn activate platelets, thus favoring thrombotic processes. NETs have been detected in venous and arterial thrombosis, but data in stroke are scarce. The aim of this study was to evaluate NETs in the plasma of patients with acute ischemic stroke and their potential association with baseline clinical characteristics, stroke severity, and one-year clinical outcomes...
July 27, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28837080/activation-of-matrix-hyaluronan-mediated-cd44-signaling-epigenetic-regulation-and-chemoresistance-in-head-and-neck-cancer-stem-cells
#18
REVIEW
Lilly Y W Bourguignon, Christine Earle, Marisa Shiina
Head and neck squamous cell carcinoma (HNSCC) is a solid tumor composed by a genotypically and phenotypically heterogeneous population of neoplastic cells types. High recurrence rate and regional metastases lead to major morbidity and mortality. Recently, many studies have focused on cellular and molecular mechanisms of tumor progression that can help to predict prognosis and to choose the best therapeutic approach for HNSCC patients. Hyaluronan (HA), an important glycosaminoglycan component of the extracellular matrix (ECM), and its major cell surface receptor, CD44, have been suggested to be important cellular mediators influencing tumor progression and treatment resistance in head and neck cancer...
August 24, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28835017/cariporide-enhances-the-dna-damage-and-apoptosis-in-acid-tolerable-malignant-mesothelioma-h-2452-cells
#19
Yoon-Jin Lee, Jin-Ho Bae, Soo-A Kim, Sung-Ho Kim, Kee-Min Woo, Hae-Seon Nam, Moon-Kyun Cho, Sang-Han Lee
The Na(+)/H(+) exchanger is responsible for maintaining the acidic tumor microenvironment through its promotion of the reabsorption of extracellular Na(+) and the extrusion of intracellular H(+). The resultant increase in the extracellular acidity contributes to the chemoresistance of malignant tumors. In this study, the chemosensitizing effects of cariporide, a potent Na(+)/H(+)-exchange inhibitor, were evaluated in human malignant mesothelioma H-2452 cells preadapted with lactic acid. A higher basal level of phosphorylated (p)-AKT protein was found in the acid-tolerable H-2452AcT cells compared with their parental acid-sensitive H-2452 cells...
August 2017: Molecules and Cells
https://www.readbyqxmd.com/read/28829846/racial-differences-in-the-extracellular-matrix-and-histone-acetylation-of-the-lamina-cribrosa-and-peripapillary-sclera
#20
Hae-Young Lopilly Park, Jie Hyun Kim, Younhea Jung, Chan Kee Park
Purpose: We investigated the extracellular matrix (ECM) of the lamina cribrosa (LC) and peripapillary sclera (PPS) and compared histone acetylation and related enzymes to identify racial differences between Korean and Caucasian donor eyes. Methods: Posterior segment tissues were obtained from 30 Caucasian donors and 42 age and axial length-matched Korean donors. Histone modification was assessed for histone deacetylase (HDAC) 2, HDAC3, and acetylated histone H3...
August 1, 2017: Investigative Ophthalmology & Visual Science
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