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Irreversible Shock

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https://www.readbyqxmd.com/read/29135941/the-small-heat-shock-protein-%C3%AE-crystallin-b-shows-neuroprotective-properties-in-a-glaucoma-animal-model
#1
Fabian Anders, Aiwei Liu, Carolina Mann, Julia Teister, Jasmin Lauzi, Solon Thanos, Franz H Grus, Norbert Pfeiffer, Verena Prokosch
Glaucoma is a neurodegenerative disease that leads to irreversible retinal ganglion cell (RGC) loss and is one of the main causes of blindness worldwide. The pathogenesis of glaucoma remains unclear, and novel approaches for neuroprotective treatments are urgently needed. Previous studies have revealed significant down-regulation of α-crystallin B as an initial reaction to elevated intraocular pressure (IOP), followed by a clear but delayed up-regulation, suggesting that this small heat-shock protein plays a pathophysiological role in the disease...
November 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29133253/the-oxidative-stress-and-antioxidant-responses-of-live-chinese-shrimp-fenneropenaeuschinensis-to-low-temperature-and-air-exposure
#2
Zihan Xu, Joe M Regenstein, Dandan Xie, Wenjing Lu, Xingchen Ren, Jiajia Yuan, Linchun Mao
Low temperature and air exposure were the key attributes for waterless transportation of fish and shrimp. In order to investigate the oxidative stress and antioxidant responses of the live shrimp Fenneropenaeuschinensis in the mimic waterless transportation, live Chinese shrimp were cooled at 13 °C for 3 min, stored in oxygen at 15 °C for 12 h, and then revived in water at 25 °C. The survival rate of shrimp under this waterless transportation system was over 86.67%. The ultrastructure of hepatopancreas cells were observed while activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), glutathione peroxidase (GSH-Px), antisuperoxide anion free radicals (ASAFR), total antioxidant capacity (TAOC), reactive oxygen species (ROS) production, content of malondialdehyde (MDA) and relative mRNA expressions of CAT and GSH-Px in the hemolymph and hepatopancreas were determined...
November 10, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29094278/substrates-of-the-chloroplast-small-heat-shock-proteins-22e-f-point-to-thermolability-as-a-regulative-switch-for-heat-acclimation-in-chlamydomonas-reinhardtii
#3
Mark Rütgers, Ligia Segatto Muranaka, Timo Mühlhaus, Frederik Sommer, Sylvia Thoms, Juliane Schurig, Felix Willmund, Miriam Schulz-Raffelt, Michael Schroda
We have identified 39 proteins that interact directly or indirectly with high confidence with chloroplast HSP22E/F under heat stress thus revealing chloroplast processes affected by heat. Under conditions promoting protein unfolding, small heat shock proteins (sHsps) prevent the irreversible aggregation of unfolding proteins by integrating into forming aggregates. Aggregates containing sHsps facilitate the access of Hsp70 and ClpB/Hsp104 chaperones, which in ATP-dependent reactions disentangle individual proteins from the aggregates and assist in their refolding to the native state...
November 1, 2017: Plant Molecular Biology
https://www.readbyqxmd.com/read/29046296/geraniin-is-a-diuretic-by-inhibiting-the-na-k-2cl-cotransporter-nkcc2
#4
Erika Moreno, Juan A Gayosso, Jose Ramón Montejano, Georgina Almaguer, Norma Vázquez, Cristino Cruz, Adriana Mercado, Norma A Bobadilla, Gerardo Gamba, Alfredo Sierra, Victoria Ramírez
Geranium seemannii Peyr is a perennial plant endemic in central Mexico that has been widely used for its diuretic effect, but the responsible compound of this effect is unknown as well as the mechanism by which the diuretic effect is achieved. Geraniin is one of the compounds isolated from this kind of geranium. This study was designed to determinate whether geraniin possesses diuretic activity and to elucidate the mechanism of action. Geraniin was extracted and purified from Geranium seemannii Peyr. Male Wistar rats were divided into four groups: 1) Control, 2) 75 mg/kg of geraniin, 3) 20 mg/Kg of furosemide, and 4) 10 mg/Kg of hydrochlorothiazide...
October 18, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28929031/procalcitonin-a-powerful-rescuer-on-surgical-floors
#5
EDITORIAL
Ahsan Zil-E-Ali, Syeda Naqvi, Mariam Tariq
Necrotizing fasciitis (NF) is a rare but life-threatening medical and surgical emergency. It is characterized by necrosis of the soft tissue leaving the overlying tissue unaffected, which delays the diagnosis and treatment. Delay in recognition of the severity of necrotizing fasciitis might lead to serious morbidity and mortality. Diagnosis of NF relies on strong clinical judgment, predictable by severe pain, erythema, and a presence of air under the skin, but all of them are not always present. Management of NF is prompt surgical intervention and antimicrobial therapy...
July 8, 2017: Curēus
https://www.readbyqxmd.com/read/28716309/arginine-vasopressin-copeptin-and-the-development-of-relative-avp-deficiency-in-hemorrhagic-shock
#6
Carrie A Sims, Yuxia Guan, Meredith Bergey, Rebecca Jaffe, Lilias Holmes-Maguire, Niels Martin, Patrick Reilly
BACKGROUND: Arginine vasopressin (AVP) is critical for maintaining vasomotor tone and low levels have been associated with the development of irreversible shock. We investigated the clinical relationship between AVP, copeptin (the C-terminal fragment of the AVP precursor), and the development of relative AVP deficiency following hemorrhagic shock. METHODS: A prospective, observational study of 21 hypotensive (SBP<90 mmHg X 2) or presumptively bleeding trauma patients was conducted...
October 2017: American Journal of Surgery
https://www.readbyqxmd.com/read/28640781/hydrogen-gas-inhalation-inhibits-progression-to-the-irreversible-stage-of-shock-after-severe-hemorrhage-in-rats
#7
Tadashi Matsuoka, Masaru Suzuki, Motoaki Sano, Kei Hayashida, Tomoyoshi Tamura, Koichiro Homma, Keiichi Fukuda, Junichi Sasaki
BACKGROUND: Mortality of hemorrhagic shock primarily depends on whether or not the patients can endure the loss of circulating volume until radical treatment is applied. We investigated whether hydrogen (H2) gas inhalation would influence the tolerance to hemorrhagic shock and improve survival. METHODS: Hemorrhagic shock was achieved by withdrawing blood until the mean arterial blood pressure reached 30-35 mm Hg. After 60 minutes of shock, the rats were resuscitated with a volume of normal saline equal to four times the volume of shed blood...
September 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28597245/protein-kinase-ck2-regulates-redox-homeostasis-through-nf-%C3%AE%C2%BAb-and-bcl-xl-in-cardiomyoblasts
#8
Susanne Schaefer, Barbara Guerra
Oxygen consumption is particularly elevated in cardiac cells as they are equipped with a large number of mitochondria and high levels of respiratory chain components. Consequently, production of reactive oxygen species (ROS) is tightly controlled as an imbalance in redox reactions can lead to irreversible cellular damage. siRNA-mediated down-regulation of protein kinase CK2 has been implicated in the accumulation of ROS in cells. The present study was undertaken in order to investigate the role of CK2 in redox homeostasis in cardiomyoblasts...
December 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28549024/the-epidemiology-of-hospital-death-following-pediatric-severe-sepsis-when-why-and-how-children-with-sepsis-die
#9
Scott L Weiss, Fran Balamuth, Josey Hensley, Julie C Fitzgerald, Jenny Bush, Vinay M Nadkarni, Neal J Thomas, Mark Hall, Jennifer Muszynski
OBJECTIVE: The epidemiology of in-hospital death after pediatric sepsis has not been well characterized. We investigated the timing, cause, mode, and attribution of death in children with severe sepsis, hypothesizing that refractory shock leading to early death is rare in the current era. DESIGN: Retrospective observational study. SETTING: Emergency departments and ICUs at two academic children's hospitals. PATIENTS: Seventy-nine patients less than 18 years old treated for severe sepsis/septic shock in 2012-2013 who died prior to hospital discharge...
September 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/28543094/mechanism-of-graphene-induced-cytotoxicity-role-of-endonucleases
#10
Tariq Fahmi, La Donna Branch, Zeid A Nima, Dae Song Jang, Alena V Savenka, Alexandru S Biris, Alexei G Basnakian
Graphene, a crystalline allotrope or carbon, presents numerous useful properties; however, its toxicity is yet to be determined. One of the most dramatic and irreversible toxic abilities of carbon nanomaterials is the induction of DNA fragmentation produced by endogenous cellular endonucleases. This study demonstrated that pristine graphene exposed to cultured kidney tubular epithelial cells is capable of inducing DNA fragmentation measured by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay, which is usually associated with cell death...
May 24, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28531183/a-scoping-review-on-bio-aerosols-in-healthcare-and-the-dental-environment
#11
REVIEW
Charifa Zemouri, Hans de Soet, Wim Crielaard, Alexa Laheij
BACKGROUND: Bio-aerosols originate from different sources and their potentially pathogenic nature may form a hazard to healthcare workers and patients. So far no extensive review on existing evidence regarding bio-aerosols is available. OBJECTIVES: This study aimed to review evidence on bio-aerosols in healthcare and the dental setting. The objectives were 1) What are the sources that generate bio-aerosols?; 2) What is the microbial load and composition of bio-aerosols and how were they measured?; and 3) What is the hazard posed by pathogenic micro-organisms transported via the aerosol route of transmission? METHODS: Systematic scoping review design...
2017: PloS One
https://www.readbyqxmd.com/read/28470920/a-rationale-for-early-extracorporeal-membrane-oxygenation-in-patients-with-postinfarction-ventricular-septal-rupture-complicated-by-cardiogenic-shock
#12
Daniel Rob, Rudolf Špunda, Jaroslav Lindner, Vilém Rohn, Jan Kunstýř, Martin Balík, Jan Rulíšek, Petr Kopecký, Michal Lipš, Ondřej Šmíd, Tomáš Kovárník, František Mlejnský, Aleš Linhart, Jan Bělohlávek
AIMS: Ventricular septal rupture (VSR) became a rare mechanical complication of myocardial infarction in the era of percutaneous coronary interventions but is associated with extreme mortality in patients who present with cardiogenic shock (CS). Promising outcomes have been reported with the use of circulatory support allowing haemodynamic stabilization, followed by delayed repair. Therefore, we analysed our experience with an early use of Veno-Arterial Extracorporeal Membrane Oxygenation (V-A ECMO) for postinfarction VSR...
May 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/28422915/enteral-tranexamic-acid-attenuates-vasopressor-resistance-and-changes-in-%C3%AE-1-adrenergic-receptor-expression-in-hemorrhagic-shock
#13
Marco Henry Santamaria, Federico Aletti, Joyce B Li, Aaron Tan, Monica Chang, Jessica Leon, Geert W Schmid-Schönbein, Erik B Kistler
BACKGROUND: Irreversible hemorrhagic shock is characterized by hyporesponsiveness to vasopressor and fluid therapy. Little is known, however, about the mechanisms that contribute to this phenomenon. Previous studies have shown that decreased intestinal perfusion in hemorrhagic shock leads to proteolytically mediated increases in gut permeability, with subsequent egress of vasoactive substances systemically. Maintenance of blood pressure is achieved in part by α1 receptor modulation, which may be affected by vasoactive factors; we thus hypothesized that decreases in hemodynamic stability and vasopressor response in shock can be prevented by enteral protease inhibition...
August 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28395022/optogenetic-manipulation-of-anatomical-re-entry-by-light-guided-generation-of-a-reversible-local-conduction-block
#14
Masaya Watanabe, Iolanda Feola, Rupamanjari Majumder, Wanchana Jangsangthong, Alexander S Teplenin, Dirk L Ypey, Martin J Schalij, Katja Zeppenfeld, Antoine A F de Vries, Daniël A Pijnappels
Aims: Anatomical re-entry is an important mechanism of ventricular tachycardia, characterized by circular electrical propagation in a fixed pathway. It's current investigative and therapeutic approaches are non-biological, rather unspecific (drugs), traumatizing (electrical shocks), or irreversible (ablation). Optogenetics is a new biological technique that allows reversible modulation of electrical function with unmatched spatiotemporal precision using light-gated ion channels. We therefore investigated optogenetic manipulation of anatomical re-entry in ventricular cardiac tissue...
March 1, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28348804/cytolethal-distending-toxin-producing-escherichia-coli-strains-causing-severe-diarrhoea-in-young-mexican-children
#15
Mario Meza-Segura, Mussaret Bano Zaidi, Samantha Maldonado-Puga, Jazmin Huerta-Cantillo, Lucia Chavez-Dueñas, Fernando Navarro-Garcia, Teresa Estrada-Garcia
Introduction. Cytolethal distending toxins (CDTs), encoded by cdt genes, have DNase activity leading to cellular and nuclear distension, resulting in irreversible cell cycle arrest and apoptosis of target cells. cdt-positive Escherichia coli strains have been isolated from children with diarrhoea. There is, however, scant information on the prevalence and clinical presentation of diarrhoeal disease caused by these strains. Furthermore, toxin production of cdt-positive strains is rarely confirmed. We report five young children with diarrhoea caused by CDT-producing E...
February 2017: JMM Case Reports
https://www.readbyqxmd.com/read/28260638/growth-recovery-and-faltering-through-early-adolescence-in-low-and-middle-income-countries-determinants-and-implications-for-cognitive-development
#16
Andreas Georgiadis, Liza Benny, Le Thuc Duc, Sheikh Galab, Prudhvikar Reddy, Tassew Woldehanna
Child chronic undernutrition, as measured by stunting, is prevalent in low- and middle-income countries and is among the major threats to child development. While stunting and its implications for cognitive development have been considered irreversible beyond early childhood there is a lack of consensus in the literature on this, as there is some evidence of recovery from stunting and that this recovery may be associated with improvements in cognition. Less is known however, about the drivers of growth recovery and the aspects of recovery linked to cognitive development...
April 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28214988/an-alternative-splice-variant-of-human-%C3%AE-a-crystallin-modulates-the-oligomer-ensemble-and-the-chaperone-activity-of-%C3%AE-crystallins
#17
Waldemar Preis, Annika Bestehorn, Johannes Buchner, Martin Haslbeck
In humans, ten genes encode small heat shock proteins with lens αA-crystallin and αB-crystallin representing two of the most prominent members. The canonical isoforms of αA-crystallin and αB-crystallin collaborate in the eye lens to prevent irreversible protein aggregation and preserve visual acuity. α-Crystallins form large polydisperse homo-oligomers and hetero-oligomers and as part of the proteostasis system bind substrate proteins in non-native conformations, thereby stabilizing them. Here, we analyzed a previously uncharacterized, alternative splice variant (isoform 2) of human αA-crystallin with an exchanged N-terminal sequence...
July 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28123061/detection-of-vulnerable-neurons-damaged-by-environmental-insults-in-utero
#18
Masaaki Torii, Masanori Sasaki, Yu-Wen Chang, Seiji Ishii, Stephen G Waxman, Jeffery D Kocsis, Pasko Rakic, Kazue Hashimoto-Torii
Development of prognostic biomarkers for the detection of prenatally damaged neurons before manifestations of postnatal disorders is an essential step for prevention and treatment of susceptible individuals. We have developed a versatile fluorescence reporter system in mice enabling detection of Heat Shock Factor 1 activation in response to prenatal cellular damage caused by exposure to various harmful chemical or physical agents. Using an intrautero electroporation-mediated reporter assay and transgenic reporter mice, we are able to identify neurons that survive prenatal exposure to harmful agents but remain vulnerable in postnatal life...
February 28, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28011703/optogenetic-termination-of-ventricular-arrhythmias-in-the-whole-heart-towards-biological-cardiac-rhythm-management
#19
Emile C A Nyns, Annemarie Kip, Cindy I Bart, Jaap J Plomp, Katja Zeppenfeld, Martin J Schalij, Antoine A F de Vries, Daniël A Pijnappels
Aims: Current treatments of ventricular arrhythmias rely on modulation of cardiac electrical function through drugs, ablation or electroshocks, which are all non-biological and rather unspecific, irreversible or traumatizing interventions. Optogenetics, however, is a novel, biological technique allowing electrical modulation in a specific, reversible and trauma-free manner using light-gated ion channels. The aim of our study was to investigate optogenetic termination of ventricular arrhythmias in the whole heart...
July 14, 2017: European Heart Journal
https://www.readbyqxmd.com/read/27999981/phospholipids-in-mitochondrial-dysfunction-during-hemorrhagic-shock
#20
REVIEW
Galina F Leskova
Energy deficiency plays a key role in the development of irreversible shock conditions. Therefore, identifying mitochondrial functional disturbances during hemorrhagic shock should be considered a prospective direction for studying its pathogenesis. Phospholipid (PL)-dependent mechanisms of mitochondrial dysfunction in the brain (i.e., in the frontal lobes of the cerebral hemispheres and medulla oblongata) and liver, which, when damaged, leads to an encephalopathy, are examined in this review. These mechanisms show strong regional specificity...
April 2017: Journal of Bioenergetics and Biomembranes
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