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https://www.readbyqxmd.com/read/29166645/angiotensin-ii-infusion-does-not-cause-abdominal-aortic-aneurysms-in-apolipoprotein-e-deficient-rats
#1
Evan H Phillips, Mandy S Chang, Sydney Gorman, Hamna J Qureshi, Karin F K Ejendal, Tamara L Kinzer-Ursem, A Nicole Blaize, Craig J Goergen
The apolipoprotein E-deficient (apoE-/-) mouse model has advanced our understanding of cardiovascular disease mechanisms and experimental therapeutics. This spontaneous model recapitulates aspects of human atherosclerosis, and allows for the development of dissecting abdominal aortic aneurysms (AAAs) when combined with angiotensin II. We characterized apoE-/- rats and hypothesized that, similar to mice, they would develop dissecting AAAs. We created rats with a 16-bp deletion of the apoE gene using transcription activator-like effector nucleases...
November 23, 2017: Journal of Vascular Research
https://www.readbyqxmd.com/read/29165635/breast-development-in-transwomen-after-one-year-of-cross-sex-hormone-therapy-results-of-a-prospective-multicenter-study
#2
Christel Josefa Maria de Blok, Maartje Klaver, Chantal Maria Wiepjes, Nienke Marije Nota, Annemieke Corine Heijboer, Alessandra Daphne Fisher, Thomas Schreiner, Guy T'Sjoen, Martin den Heijer
Context: Breast development is a key feature of feminization and therefore important to transwomen (male-to-female transgender persons). However, it is not exactly known when breast development starts after initiating cross-sex hormone therapy (CHT) and how much growth may be expected of CHT alone. Objective: To investigate breast development in centimeters and bra cup-sizes in transwomen during their first year of CHT, and whether clinical or laboratory parameters predict the breast development...
November 20, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29165246/regulatory-coiled-coil-domains-promote-head-to-head-assemblies-of-aaa-chaperones-essential-for-tunable-activity-control
#3
Marta Carroni, Kamila B Franke, Michael Maurer, Jasmin Jäger, Ingo Hantke, Felix Gloge, Daniela Linder, Sebastian Gremer, Kürşad Turgay, Bernd Bukau, Axel Mogk
Ring-forming AAA+ chaperones exert ATP-fueled substrate unfolding by threading through a central pore. This activity is potentially harmful requiring mechanisms for tight repression and substrate-specific activation. The AAA+ chaperone ClpC with the peptidase ClpP forms a bacterial protease essential to virulence and stress resistance. The adaptor MecA activates ClpC by targeting substrates and stimulating ClpC ATPase activity. We show how ClpC is repressed in its ground state by determining ClpC cryo-EM structures with and without MecA...
November 22, 2017: ELife
https://www.readbyqxmd.com/read/29165244/the-aaa-atpase-vps4-binds-escrt-iii-substrates-through-a-repeating-array-of-dipeptide-binding-pockets
#4
Han Han, Nicole Monroe, Wesley I Sundquist, Peter S Shen, Christopher P Hill
The hexameric AAA ATPase Vps4 drives membrane fission by remodeling and disassembling ESCRT-III filaments. Building upon our earlier 4.3 Å resolution cryo-EM structure (Monroe, Han et al. 2017), we now report a 3.2 Å structure of Vps4 bound to an ESCRT-III peptide substrate. The new structure reveals that the peptide approximates a b-strand conformation whose helical symmetry matches that of the five Vps4 subunits it contacts directly. Adjacent Vps4 subunits make equivalent interactions with successive substrate dipeptides through two distinct classes of side chain binding pockets formed primarily by Vps4 pore loop 1...
November 22, 2017: ELife
https://www.readbyqxmd.com/read/29161397/abdominal-aortic-aneurysm-repair-in-the-united-kingdom-an-exemplar-for-the-role-of-anaesthetists-in-perioperative-medicine
#5
S J Howell
The past two decades have seen an increasing recognition that the delivery of safe surgery with low complication rates and good long-term outcomes is a team endeavour embracing the whole patient care pathway. The key role of the anaesthetist in managing the patient through the surgical process is widely understood and has driven the emergence of perioperative medicine. In parallel with these developments there has been a sea change in the organisation of the care of patients presenting for elective abdominal aortic aneurysm (AAA) repair...
December 1, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29159573/low-baseline-and-subsequent-higher-aortic-abdominal-aneurysm-fdg-uptake-are-associated-with-poor-sac-shrinkage-post-endovascular-repair
#6
Pierre-Yves Marie, Didier Plissonnier, Stéphanie Bravetti, Raphael Coscas, Martin Rouer, Stéphan Haulon, Damien Mandry, Jean-Marc Alsac, Sergueï Malikov, Nicla Settembre, Yann Gouëffic, Olivier Morel, Véronique Roch, Emilien Micard, Zohra Lamiral, Jean-Baptiste Michel, Patrick Rossignol
PURPOSE: The growth phases of medically treated abdominal aortic aneurysms (AAA) are frequently associated with an (18)F-fluorodesoxyglucose positron emission tomography (FDG-PET) pattern involving low baseline and subsequent higher FDG uptake. However, the FDG-PET patterns associated with the endovascular aneurysm repair (EVAR) of larger AAA are presently unknown. This study aimed to investigate the relationship between serial AAA FDG uptake measurements, obtained before EVAR and 1 and 6 months post-intervention and subsequent sac shrinkage at 6 months, a well-recognized indicator of successful repair...
November 21, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29158532/recombinant-decorin-fusion-protein-attenuates-murine-abdominal-aortic-aneurysm-formation-and-rupture
#7
Yue Shen, Valerio Russo, Matthew R Zeglinski, Stephanie L Sellers, Zhengguo Wu, Cameron Oram, Stephanie Santacruz, Yulia Merkulova, Christopher Turner, Keerit Tauh, Hongyan Zhao, Tatjana Bozin, Lubos Bohunek, Haishan Zeng, Michael A Seidman, R Chris Bleackley, Bruce M McManus, Erkki Ruoslahti, Tero A H Järvinen, David J Granville
Decorin (DCN) is a small-leucine rich proteoglycan that mediates collagen fibrillogenesis, organization, and tensile strength. Adventitial DCN is reduced in abdominal aortic aneurysm (AAA) resulting in vessel wall instability thereby predisposing the vessel to rupture. Recombinant DCN fusion protein CAR-DCN was engineered with an extended C-terminus comprised of CAR homing peptide that recognizes inflamed blood vessels and penetrates deep into the vessel wall. In the present study, the role of systemically-administered CAR-DCN in AAA progression and rupture was assessed in a murine model...
November 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29158067/psoas-muscle-area-as-a-prognostic-factor-for-survival-in-patients-with-an-asymptomatic-infrarenal-abdominal-aortic-aneurysm-a-retrospective-cohort-study
#8
Reza Indrakusuma, Jendé L Zijlmans, Hamid Jalalzadeh, R Nils Planken, Ron Balm, Mark J W Koelemay
OBJECTIVES: Loss of muscle mass has been associated with poor survival in several surgical patient populations, including those with an abdominal aortic aneurysm (AAA). We wanted to replicate these findings and assesse the association between psoas muscle area (PMA) and survival in patients with an asymptomatic AAA. METHODS: Patients with an asymptomatic infrarenal AAA who underwent computed tomography (CT) scanning between January 1, 2007, and December 31, 2013, were included in this single-centre retrospective cohort study...
November 17, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/29156584/identification-of-physiological-substrates-and-binding-partners-of-the-plant-mitochondrial-protease-ftsh4-by-the-trapping-approach
#9
Magdalena Opalińska, Katarzyna Parys, Hanna Jańska
Maintenance of functional mitochondria is vital for optimal cell performance and survival. This is accomplished by distinct mechanisms, of which preservation of mitochondrial protein homeostasis fulfills a pivotal role. In plants, inner membrane-embedded i-AAA protease, FTSH4, contributes to the mitochondrial proteome surveillance. Owing to the limited knowledge of FTSH4's in vivo substrates, very little is known about the pathways and mechanisms directly controlled by this protease. Here, we applied substrate trapping coupled with mass spectrometry-based peptide identification in order to extend the list of FTSH4's physiological substrates and interaction partners...
November 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29155740/creation-of-a-rodent-model-of-abdominal-aortic-aneurysm-by-blocking-adventitial-vasa-vasorum-perfusion
#10
Hiroki Tanaka, Naoki Unno, Tatsuro Yata, Hirona Kugo, Nobuhiro Zaima, Takeshi Sasaki, Tetsumei Urano
The adventitial vasa vasorum (VV) provides oxygen and nourishment to the aortic wall. Hypoxia in the aortic wall can cause enlarged abdominal aortic aneurysms (AAAs). This article introduces and describes a standard protocol used to induce AAAs through adventitial VV hypoperfusion created with a combination of polyurethane catheter insertion into the aortic lumen and suture ligation of the infrarenal abdominal aorta. The protocol involves the use of male rats weighing 300-400 g, which are provided food and water ad libitum...
November 8, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29153807/thoracic-endovascular-aortic-repair-using-vascular-plug-for-chronic-type-iiib-aortic-dissection
#11
Up Huh, Seunghwan Song, Eunji Kim, Chang Won Kim
A 72-year-old man previously treated for an abdominal aortic aneurysm (AAA) was diagnosed with the 70-mm-sized type IIIb aortic dissection. Endovascular repair was considered, but there was no stent graft passing through the 8-mm iliac graft that was used for open repair of the AAA. We sealed the 5-mm-sized intimal tear site, using an Amplatzer Vascular Plug, which successfully repaired. The patient was discharged and had no complications. Serial follow-up computerized tomography scans showed that the vascular plug was positioned without migration, and the size of the aorta decreased...
December 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29153394/vcp-p97-mediated-unfolding-as-a-principle-in-protein-homeostasis-and-signaling
#12
REVIEW
Johannes van den Boom, Hemmo Meyer
The AAA+-type ATPase p97 governs an ever-expanding number of cellular processes reaching from degradation of damaged proteins and organelles to key signaling events and chromatin regulation with thousands of client proteins. With its relevance for cellular homeostasis and genome stability, it is linked to muscular and neuronal degeneration and, conversely, constitutes an attractive anti-cancer drug target. Its molecular function is ATP-driven protein unfolding, which is directed by ubiquitin and assisted by a host of cofactor proteins...
November 15, 2017: Molecular Cell
https://www.readbyqxmd.com/read/29153229/psychosocial-consequences-in-men-taking-part-in-a-national-screening-program-for-abdominal-aortic-aneurysm
#13
Anna Ericsson, Jan Holst, Anders Gottsäter, Moncef Zarrouk, Christine Kumlien
Screening for abdominal aortic aneurysm (AAA) has proven to reduce AAA-related mortality, but how the knowledge of having an untreated AAA affects health and daily life requires further clarification. The aim was to investigate the psychosocial consequences and sense of coherence (SOC) in 65-year-old men diagnosed with AAA and participating in a national screening program during a 6-month follow-up compared with men with no AAA. The single-center cohort study included 52 men with AAA and 118 men without AAA...
December 2017: Journal of Vascular Nursing: Official Publication of the Society for Peripheral Vascular Nursing
https://www.readbyqxmd.com/read/29149818/renal-dysfunction-following-elective-endovascular-aortic-aneurysm-repair
#14
Esma Isenovic, Djodje Radak, Mihailo Neskovic, Petar Otasevic
Abdominal aortic aneurysm (AAA) is a degenerative disease of the aortic wall with potentially fatal complications. Open repair (OR) was considered the gold standard, until the emergence of endovascular aneurysm repair (EVAR), which is less invasive and equally (if not more) effective. As the popularity of endovascular procedures grows, related complications become more evident, with kidney damage being one of them. Although acute kidney injury (AKI) following EVAR is relatively common, its true incidence is still uncertain...
November 16, 2017: Current Vascular Pharmacology
https://www.readbyqxmd.com/read/29149040/a-coap-based-network-access-authentication-service-for-low-power-wide-area-networks-lo-coap-eap
#15
Dan Garcia-Carrillo, Rafael Marin-Lopez, Arunprabhu Kandasamy, Alexander Pelov
The Internet-of-Things (IoT) landscape is expanding with new radio technologies. In addition to the Low-Rate Wireless Personal Area Network (LR-WPAN), the recent set of technologies conforming the so-called Low-Power Wide Area Networks (LP-WAN) offers long-range communications, allowing one to send small pieces of information at a reduced energy cost, which promotes the creation of new IoT applications and services. However, LP-WAN technologies pose new challenges since they have strong limitations in the available bandwidth...
November 17, 2017: Sensors
https://www.readbyqxmd.com/read/29148099/circulating-pcsk9-is-lowered-acutely-following-surgery
#16
Irena Druce, Hussein Abujrad, Seham Chaker, Hilary Meggison, Andrew Hill, Angela Raymond, Janice Mayne, Teik Chye Ooi
BACKGROUND: A decrease in serum low-density lipoprotein cholesterol (LDL-C) is well documented after acute stress. Plasma proprotein convertase subtilisin kexin 9 (PCSK9), which promotes degradation of low-density lipoprotein receptor (LDL-R) resulting in reduced plasma clearance of low-density lipoproteins (LDL) and an increase in serum LDL-C, would be predicted to decrease. Yet, a few studies have demonstrated an increase 1-8 days after acute stress. Our objective was to assess the earlier status of plasma PCSK9, within the first 24 hours of onset of stress...
November 17, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/29147506/pd-catalyzed-asymmetric-allylic-alkylations-via-c-h-activation-of-n-allyl-imines-with-glycinates
#17
Barry M Trost, Xiaoxun Li
Herein is reported the first example of palladium-catalyzed asymmetric allylic alkylation (AAA) reactions involving 2-aza-π-allyl palladium intermediates. The 2-aza-π-allyl complex was generated via a novel mode of activation of N-allyl imines. Pd-catalyzed C(sp(3))-H activation of N-allyl imines and subsequent nucleophilic attack by glycinates delivered vicinal diamino derivatives as the sole regioisomers with high levels of diastereo- and enantio-control in the presence of the chiral, bidentate (S,S)-Cy-DIOP ligand...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29147166/a-cost-utility-analysis-of-endovascular-aneurysm-repair-for-abdominal-aortic-aneurysm
#18
Yutaka Takayama
Objective: To assess medical economic adequacy of endovascular aneurysm repair (EVAR) for abdominal aortic aneurysm (AAA). Methods: Cost-utility analysis. A total of 21 patients with AAA treated at Ibaraki Prefectural Central Hospital in 2014 were divided into non-ruptured EVAR (Group E) and open surgery (OS) (Group O), and ruptured OS (Group R) groups, and hospital costs were aggregated with a medical accounting system. Mid-level hospital costs were estimated by a diagnosis-procedure-combination analysis system...
September 25, 2017: Annals of Vascular Diseases
https://www.readbyqxmd.com/read/29147158/successful-hybrid-treatment-of-stent-graft-migration-caused-by-type-b-aortic-dissection-after-endovascular-aortic-aneurysm-repair-a-case-report
#19
Tsunehiro Shintani, Kouji Atsuta, Takaaki Saito
Herein, we report a rare case of type B aortic dissection that occurred after endovascular aortic aneurysm repair (EVAR). A 66-year-old man underwent successful EVAR for an abdominal aortic aneurysm (AAA). Computed tomography (CT) 2 years after EVAR showed a type B aortic dissection with stent-graft migration and AAA expansion. Juxtarenal aortic expansion precluded simple stent-graft placement. He underwent hepato-spleno-renal bypass followed by stent-graft placement just below the superior mesenteric artery...
September 25, 2017: Annals of Vascular Diseases
https://www.readbyqxmd.com/read/29145894/inositol-in-the-management-of-abdominal-aortic-aneurysm-imagen-study-protocol-for-a-randomised-controlled-trial
#20
Sophie E Rowbotham, Jenna L Pinchbeck, Georgina Anderson, Bernie Bourke, Michael Bourke, T Christian Gasser, Rene Jaeggi, Jason S Jenkins, Corey S Moran, Susan K Morton, Christopher M Reid, Ramesh Velu, Lisan Yip, Joseph V Moxon, Jonathan Golledge
BACKGROUND: An abdominal aortic aneurysm (AAA) is a focal dilation of the abdominal aorta and is associated with a risk of fatal rupture. Experimental studies suggest that myo-inositol may exert beneficial effects on AAAs through favourable changes to biological pathways implicated in AAA pathology. The aim of the Inositol in the MAnaGemENt of abdominal aortic aneurysm (IMAGEN) trial is to assess if myo-inositol will reduce AAA growth. METHODS/DESIGN: IMAGEN is a multi-centre, prospective, parallel-group, randomised, double-blind, placebo-controlled trial...
November 16, 2017: Trials
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