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https://www.readbyqxmd.com/read/28303166/single-molecule-studies-of-high-mobility-group-b-architectural-dna-bending-proteins
#1
REVIEW
Divakaran Murugesapillai, Micah J McCauley, L James Maher, Mark C Williams
Protein-DNA interactions can be characterized and quantified using single molecule methods such as optical tweezers, magnetic tweezers, atomic force microscopy, and fluorescence imaging. In this review, we discuss studies that characterize the binding of high-mobility group B (HMGB) architectural proteins to single DNA molecules. We show how these studies are able to extract quantitative information regarding equilibrium binding as well as non-equilibrium binding kinetics. HMGB proteins play critical but poorly understood roles in cellular function...
February 2017: Biophysical Reviews
https://www.readbyqxmd.com/read/28286376/high-mobility-group-box-1-protein-and-outcomes-in-critically-ill-surgical-patients-requiring-open-abdominal-management
#2
Michelle S Malig, Craig N Jenne, Chad G Ball, Derek J Roberts, Zhengwen Xiao, Andrew W Kirkpatrick
Background. Previous studies assessing various cytokines in the critically ill/injured have been uninformative in terms of translating to clinical care management. Animal abdominal sepsis work suggests that enhanced intraperitoneal (IP) clearance of Damage-Associated Molecular Patterns (DAMPs) improves outcome. Thus measuring the responses of DAMPs offers alternate potential insights and a representative DAMP, High Mobility Group Box-1 protein (HMGB-1), was considered. While IP biomediators are being recognized in critical illness/trauma, HMGB-1 behaviour has not been examined in open abdomen (OA) management...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28255175/disruption-of-endothelial-cell-homeostasis-plays-a-key-role-in-the-early-pathogenesis-of-coronary-artery-abnormalities-in-kawasaki-disease
#3
Kentaro Ueno, Yumiko Ninomiya, Daisuke Hazeki, Kiminori Masuda, Yuichi Nomura, Yoshifumi Kawano
Disruption of endothelial cell homeostasis may be associated with the pathogenesis of coronary artery abnormalities (CAA) in Kawasaki disease (KD). We sought to clarify the poorly understood pathogenic role of endothelial cell survival and death in KD vasculitis. Human umbilical vein endothelial cells (HUVECs) stimulated with sera from KD patients, compared with sera from patients with bacterial infections, exhibited significant increases in cytotoxicity, high mobility group box protein 1 (HMGB-1), and caspase-3/7 and a decrease in phosphorylated Akt/Akt (pAkt/Akt) ratios...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28183701/association-of-serum-hmgb2-levels-with-in-stent-restenosis-hmgb2-promotes-neointimal-hyperplasia-in-mice-with-femoral-artery-injury-and-proliferation-and-migration-of-vsmcs
#4
Yu Hu He, Xiao Qun Wang, Jian Zhang, Zhu Hui Liu, Wen Qi Pan, Ying Shen, Zheng Bin Zhu, Ling Jie Wang, Xiao Xiang Yan, Ke Yang, Rui Yan Zhang, Wei Feng Shen, Feng Hua Ding, Lin Lu
OBJECTIVE: In a previous study, we established diabetic and nondiabetic minipig models with coronary artery in-stent restenosis (ISR). Mass spectrometry showed that high-mobility group box (HMGB) 2 level was higher in ISR than in non-ISR tissue from diabetic minipigs. We here investigated whether serum HMGB2 levels were related to ISR in CAD patients. The effect of HMGB2 was evaluated in mice with femoral artery wire injury and in human aortic smooth muscle cells. APPROACH AND RESULTS: From 2513 patients undergoing coronary artery intervention and follow-up angiography at ≈1 year, 262 patients were diagnosed with ISR, and 298 patients with no ISR were randomly included as controls...
February 9, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28178282/trypanosoma-cruzi-high-mobility-group-b-tchmgb-can-act-as-an-inflammatory-mediator-on-mammalian-cells
#5
Pamela Cribb, Virginia Perdomo, Victoria L Alonso, Romina Manarin, Jorge Barrios-Payán, Brenda Marquina-Castillo, Luis Tavernelli, Rogelio Hernández-Pando
BACKGROUND: High Mobility Group B (HMGB) proteins are nuclear architectural factors involved in chromatin remodeling and important nuclear events. HMGBs also play key roles outside the cell acting as alarmins or Damage-associated Molecular Patterns (DAMPs). In response to a danger signal these proteins act as immune mediators in the extracellular milieu. Moreover, these molecules play a central role in the pathogenesis of many autoimmune and both infectious and sterile inflammatory chronic diseases...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28145460/caffeic-acid-cyclohexylamide-rescues-lethal-inflammation-in-septic-mice-through-inhibition-of-i%C3%AE%C2%BAb-kinase-in-innate-immune-process
#6
Jun Hyeon Choi, Sun Hong Park, Jae-Kyung Jung, Won-Jea Cho, Byeongwoo Ahn, Cheong-Yong Yun, Yong Pyo Choi, Jong Hun Yeo, Heesoon Lee, Jin Tae Hong, Sang-Bae Han, Youngsoo Kim
Targeting myeloid differentiation protein 2 (MD-2) or Toll-like receptor 4 (TLR4) with small molecule inhibitor rescues the systemic inflammatory response syndrome (SIRS) in sepsis due to infection with Gram-negative bacteria but not other microbes. Herein, we provided IκB kinase β (IKKβ) in innate immune process as a molecular target of caffeic acid cyclohexylamide (CGA-JK3) in the treatment of polymicrobial TLR agonists-induced lethal inflammation. CGA-JK3 ameliorated E. coli lipopolysaccharide (LPS, MD-2/TLR4 agonist)-induced endotoxic shock, cecal ligation and puncture (CLP)-challenged septic shock or LPS plus D-galactosamine (GalN)-induced acute liver failure (ALF) in C57BL/6J mice...
February 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28135708/remote-ischaemic-preconditioning-and-sevoflurane-postconditioning-synergistically-protect-rats-from-myocardial-injury-induced-by-ischemia-and-reperfusion-partly-via-inhibition-tlr4-myd88-nf-%C3%AE%C2%BAb-signaling-pathway
#7
Jiru Zhang, Jing Zhang, Peng Yu, Min Chen, Qingfeng Peng, Zhiqiang Wang, Nan Dong
BACKGROUND/AIMS: A combination sevoflurane postconditioning (SPC) and remote ischemic preconditioning (RIPC) is proved effective in an ex vivo rat heart perfusion model. However, the combined effect of those two interventions is not tested in rat myocardial ischemia/reperfusion (I/R) model, and the underlying mechanisms remain to be elucidated. This study aimed to investigate the effect in vivo using a rat myocardial I/R model and illuminate the related mechanisms. METHODS: Forty male Sprague-Dawley rats were randomly divided into the following 5 groups: i) sham-operated control; ii) I/R; iii) I/R + RIPC; iv) I/R + SPC; v) I/R + RIPC + SPC...
January 16, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28125840/association-of-high-mobility-group-box-1-with-th-cell-related-cytokines-in-the-vitreous-of-ocular-sarcoidosis-patients
#8
Masaru Takeuchi, Manzo Taguchi, Tomohito Sato, Kyoko Karasawa, Yutaka Sakurai, Kohzou Harimoto, Masataka Ito
Purpose: High-mobility group box-1 (HMGB1) is a nonhistone DNA-binding nuclear protein released from necrotic cells, which is also secreted by activated leukocytes and acts as a primary proinflammatory cytokine. In this study, we compared vitreous HMGB1 levels in ocular sarcoidosis with those in noninflammatory vitreoretinal diseases and evaluated its association with Th cell-related and proinflammatory cytokines. Methods: The study group consisted of 24 patients with ocular sarcoidosis...
January 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28061787/plasma-markers-of-inflammation-and-hemostatic-and-endothelial-activity-in-naturally-overweight-and-obese-dogs
#9
R Barić Rafaj, J Kuleš, A Marinculić, A Tvarijonaviciute, J Ceron, Ž Mihaljević, A Tumpa, V Mrljak
BACKGROUND: Obesity is one of the most prevalent health problems in the canine population. While haemostatic parameters and markers of endothelial function have been evaluated in various disease conditions in dogs, there are no studies of these markers in canine obesity. This study was designed to evaluate the effect of naturally gained weight excess and obesity on inflammatory, hemostatic and endothelial biomarkers in dogs. A total of 37 overweight and obese dogs were compared with 28 normal weight dogs...
January 6, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28059131/dioscin-relieves-endotoxemia-induced-acute-neuro-inflammation-and-protect-neurogenesis-via-improving-5-ht-metabolism
#10
Rui Yang, Wei Chen, Ye Lu, Yingke Li, Hongli Du, Songyan Gao, Xin Dong, Hongbin Yuan
Sepsis, in addition to causing fatality, is an independent risk factor for cognitive impairment among sepsis survivors. The pathologic mechanism of endotoxemia induced acute neuro-inflammation still has not been fully understood. For the first time, we found the disruption of neurotransmitters 5-HT, impaired neurogenesis and activation of astrocytes coupled with concomitant neuro-inflammation were the potential pathogenesis of endotoxemia induced acute neuro-inflammation in sepsis survivors. In addition, dioscin a natural steroidal saponin isolated from Chinese medicinal herbs, enhanced the serotonergic system and produced anti-depressant effect by enhancing 5-HT levels in hippocampus...
January 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28025045/a-novel-role-for-nhp6-proteins-in-histone-gene-regulation-in-saccharomyces-cerevisiae
#11
Diletta Durano, Andrea Lukacs, Francesca Di Felice, Gioacchino Micheli, Giorgio Camilloni
Maintaining a stable and balanced histone pool is of paramount importance for genome stability and fine regulation of DNA replication and transcription. This involves a complex regulatory machinery, exploiting transcription factors as well as histone chaperones, chromatin remodelers and modifiers. The functional details of this machinery are as yet unclear. Previous studies report histone decrease in mammalian and yeast HMGB family mutants. In this study we find that Nhp6 proteins, the S. cerevisiae HMGB1 homologues, control histone gene expression by affecting nucleosome stability at regulative regions of the histone clusters...
December 23, 2016: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28011583/association-of-serum-hmgb2-level-with-mace-at-1-month-of-myocardial-infarction-aggravation-of-myocardial-ischemic-injury-in-rat-by-hmgb2-via-ros
#12
Zhu Hui Liu, Dao Peng Dai, Feng Hua Ding, Wen Qi Pan, Yue Hua Fang, Qi Zhang, Man Li, Ping Yang, Xiao Qun Wang, Ying Shen, Ling Jie Wang, Xiao Xiang Yan, Yu Hu He, Ke Yang, Rui Yan Zhang, Wei Feng Shen, Ying Chen, Lin Lu
BACKGROUND: High-mobility group box (HMGB) family is related to inflammatory diseases. We investigated whether serum HMGB2 levels are related to myocardial infarction (MI) severity and major adverse cardiac events (MACE) during MI. METHODS AND RESULTS: We included 432 consecutive patients with ST-segment elevation myocardial infarction and 312 controls. Serum HMGB2 levels were significantly higher in MI patients than in controls. Increased HMGB2 levels were associated with MACE and negatively with ejection fraction in MI patients...
December 23, 2016: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/27990361/upregulated-inflammatory-associated-factors-and-blood-retinal-barrier-changes-in-the-retina-of-type-2-diabetes-mellitus-model
#13
Rui-Jin Ran, Xiao-Ying Zheng, Li-Ping Du, Xue-Dong Zhang, Xiao-Li Chen, Shen-Yin Zhu
AIM: To examine the expression of high mobility group box-1 (HMGB-1) and intercellular adhesion molecule-1 (ICAM-1) in the retina and the hippocampal tissues; and further to evaluate the association of these two molecules with the alterations of blood-retinal barrier (BRB) and blood-brain barrier (BBB) in a rat model of type 2 diabetes. METHODS: The type-2 diabetes mellitus (DM) model was established with a high-fat and high-glucose diet combined with streptozotocin (STZ)...
2016: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/27981190/stress-induced-neuroinflammatory-priming-a-liability-factor-in-the-etiology-of-psychiatric-disorders
#14
REVIEW
Matthew G Frank, Michael D Weber, Linda R Watkins, Steven F Maier
Stress and glucocorticoids (GCs) have universally been considered to be anti-inflammatory, however in recent years, stress and GCs have been found to exert permissive effects (immunological priming) on neuroinflammatory processes. This phenomenon of priming is characterized by prior stress or GC exposure potentiating the neuroinflammatory response to a subsequent immune challenge. A considerable body of evidence is discussed here that supports this permissive effect of stress and GCs. In light of this evidence, a mechanism of neuroinflammatory priming is proposed involving a signal cascade in the brain involving danger-associated molecular patterns (HMGB-1) and inflammasomes (NLRP3), which results in an exaggerated or amplified neuroinflammatory response and subsequently, the amplification of the physiological and behavioral sequelae of this response (i...
October 2016: Neurobiology of Stress
https://www.readbyqxmd.com/read/27942008/the-dpp4-inhibitor-linagliptin-protects-from-experimental-diabetic-retinopathy
#15
Nadine Dietrich, Matthias Kolibabka, Stephanie Busch, Petra Bugert, Ulrike Kaiser, Jihong Lin, Thomas Fleming, Michael Morcos, Thomas Klein, Andrea Schlotterer, Hans-Peter Hammes
BACKGROUND/AIMS: Dipeptidyl peptidase 4 (DPP4) inhibitors improve glycemic control in type 2 diabetes, however, their influence on the retinal neurovascular unit remains unclear. METHODS: Vasculo- and neuroprotective effects were assessed in experimental diabetic retinopathy and high glucose-cultivated C. elegans, respectively. In STZ-diabetic Wistar rats (diabetes duration of 24 weeks), DPP4 activity (fluorometric assay), GLP-1 (ELISA), methylglyoxal (LC-MS/MS), acellular capillaries and pericytes (quantitative retinal morphometry), SDF-1a and heme oxygenase-1 (ELISA), HMGB-1, Iba1 and Thy1...
2016: PloS One
https://www.readbyqxmd.com/read/27908811/decreased-serum-levels-of-high-mobility-group-box-1-hmgb-1-after-graft-replacement-or-stenting-of-abdominal-aortic-aneurysm
#16
Daiki Ousaka, Yasuhiro Fujii, Susumu Oozawa, Masahiro Nishibori, Yosuke Kuroko, Zenichi Masuda, Shunji Sano
OBJECTIVES: High-mobility group box 1 (HMGB-1) is a key substance mediating inflammation and development of atherosclerotic lesions (AL), including abdominal aortic aneurysms (AAA). Serum levels of HMGB-1 are increased in patients with AAA than in normal controls because the ALs in AAAs secrete HMGB-1. We therefore postulate that the serum HMGB-1 level should decrease after endovascular aortic repair (EVAR) or open aortic repair (OAR). However, there is no evidence of this in the literature...
November 28, 2016: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/27903656/yeast-hmo1-linker-histone-reinvented
#17
REVIEW
Arvind Panday, Anne Grove
Eukaryotic genomes are packaged in chromatin. The higher-order organization of nucleosome core particles is controlled by the association of the intervening linker DNA with either the linker histone H1 or high mobility group box (HMGB) proteins. While H1 is thought to stabilize the nucleosome by preventing DNA unwrapping, the DNA bending imposed by HMGB may propagate to the nucleosome to destabilize chromatin. For metazoan H1, chromatin compaction requires its lysine-rich C-terminal domain, a domain that is buried between globular domains in the previously characterized yeast Saccharomyces cerevisiae linker histone Hho1p...
March 2017: Microbiology and Molecular Biology Reviews: MMBR
https://www.readbyqxmd.com/read/27872202/genome-wide-overexpression-screen-identifies-genes-able-to-bypass-p16-mediated-senescence-in-melanoma
#18
Won Jae Lee, Dubravka Škalamera, Mareike Dahmer-Heath, Konstanin Shakhbazov, Max V Ranall, Carly Fox, Duncan Lambie, Alexander J Stevenson, Paul Yaswen, Thomas J Gonda, Brian Gabrielli
Malignant melanomas often arise from nevi, which result from initial oncogene-induced hyperproliferation of melanocytes that are maintained in a CDKN2A/p16-mediated senescent state. Thus, genes that can bypass this senescence barrier are likely to contribute to melanoma development. We have performed a gain-of-function screen of 17,030 lentivirally expressed human open reading frames (ORFs) in a melanoma cell line containing an inducible p16 construct to identify such genes. Genes known to bypass p16-induced senescence arrest, including the human papilloma virus 18 E7 gene ( HPV18E7), and genes such as the p16-binding CDK6 with expected functions, as well as panel of novel genes, were identified, including high-mobility group box (HMGB) proteins...
March 2017: SLAS Discov
https://www.readbyqxmd.com/read/27869797/the-receptor-for-advanced-glycation-end-products-impairs-collateral-formation-in-both-diabetic-and-non-diabetic-mice
#19
Laura M Hansen, Divya Gupta, Giji Joseph, Daiana Weiss, W Robert Taylor
Diabetics often have poor perfusion in their limbs as a result of peripheral artery disease and an impaired ability to generate collateral vessels. The receptor for advanced glycation end products (RAGE) is one protein that is thought to play a detrimental role in collateral development in diabetics due to increased levels of advanced glycation end products (AGE), one of its ligands, in diabetes. Thus, the aim of this study was to investigate the role of RAGE in both diabetic and non-diabetic settings in a model of collateral formation in mice...
January 2017: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/27860296/impact-of-subnormothermic-machine-perfusion-preservation-in-severely-steatotic-rat-livers-a-detailed-assessment-in-an-isolated-setting
#20
Y Okamura, K Hata, H Tanaka, H Hirao, T Kubota, O Inamoto, S Kageyama, I Tamaki, N Yermek, J Yoshikawa, S Uemoto
The current drastic shortage of donor organs has led to acceptance of extended-criteria donors for transplantation, despite higher risk of primary nonfunction. Here, we report the impact of subnormothermic machine perfusion (SMP) preservation on the protection of >50% macrosteatotic livers. Dietary hepatic steatosis was induced in Wistar rats via 2-day fasting and subsequent 3-day re-feeding with a fat-free, carbohydrate-rich diet. This protocol induces 50-60% macrovesicular steatosis, which should be discarded when preserved via cold storage (CS)...
November 10, 2016: American Journal of Transplantation
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