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Tissue plasminogen activator

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https://www.readbyqxmd.com/read/28731176/hypotonic-contrast-media-is-more-toxic-than-isotonic-contrast-media-on-endothelial-cells-in-vivo-and-in-vitro
#1
Lihui Ren, Ping Wang, Zuoyan Wang, Yong Liu, Shuzheng Lv
The aim of the current study was to investigate the cytotoxic effects of hypotonic (iopamidol) and isotonic (iodixanol) contract media (CMs) in vitro and in vivo. A total of 60 Wistar rats were included and were randomly divided into three groups (20 rats per group). Iodixanol (4 g iodine/kg), iopamidol (4 g iodine/kg) or equal volume of normal saline was injected via tail vein. HUVEC and H5V cell viability was determined by Cell Counting Kit‑8 agents. Western blotting was performed to detect ATP‑binding cassette subfamily G member 1 (ABCG1) expression...
July 21, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28730951/penumbra-and-re-canalization-acute-computed-tomography-in-ischemic-stroke-evaluation-practise-study-protocol
#2
Salwa El-Tawil, Joanna Wardlaw, Ian Ford, Grant Mair, Tom Robinson, Lalit Kalra, Keith W Muir
Rationale Multimodal imaging, including computed tomography angiography and computed tomography perfusion imaging, yields additional information on intracranial vessels and brain perfusion and can differentiate between ischemic core and penumbra which may affect patient selection for intravenous thrombolysis. Hypothesis The use of multimodal imaging will increase the number of patients receiving intravenous thrombolysis and lead to better treatment outcomes. Sample size 400 patients. Methods and design PRACTISE is a prospective, multicenter, randomized, controlled trial in which patients presenting within 4...
August 2017: International Journal of Stroke: Official Journal of the International Stroke Society
https://www.readbyqxmd.com/read/28730949/eric-acute-stroke-recanalization-a-study-using-predictive-analytics-to-assess-a-new-device-for-mechanical-thrombectomy
#3
Susanne Siemonsen, Nils D Forkert, Martina Bernhardt, Götz Thomalla, Martin Bendszus, Jens Fiehler
Aim and hypothesis Using a new study design, we investigate whether next-generation mechanical thrombectomy devices improve clinical outcomes in ischemic stroke patients. We hypothesize that this new methodology is superior to intravenous tissue plasminogen activator therapy alone. Methods and design ERic Acute StrokE Recanalization is an investigator-initiated prospective single-arm, multicenter, controlled, open label study to compare the safety and effectiveness of a new recanalization device and distal access catheter in acute ischemic stroke patients with symptoms attributable to acute ischemic stroke and vessel occlusion of the internal cerebral artery or middle cerebral artery...
August 2017: International Journal of Stroke: Official Journal of the International Stroke Society
https://www.readbyqxmd.com/read/28728855/tissue-plasminogen-activator-tpa-signal-sequence-enhances-immunogenicity-of-mva-based-vaccine-against-tuberculosis
#4
Yiming Kou, Yongqing Xu, Zhilei Zhao, Jie Liu, Yang Wu, Qingrui You, Linli Wang, Feng Gao, Linjun Cai, Chunlai Jiang
Tuberculosis (TB) remains a serious health problem worldwide, and the only available vaccine, bacillus Calmette-Guérin (BCG), has shown highly variable efficacy in adults against TB. New vaccines are urgently needed, and the modified vaccinia virus Ankara (MVA)-based vaccine has emerged as one of the most promising candidates based on many preclinical and early clinical studies over the past few years. However, the maximum tolerable dose and strength of induced immune responses have limited the protective effect of MVA-based prophylactic vaccines...
July 17, 2017: Immunology Letters
https://www.readbyqxmd.com/read/28728144/retinal-penetration-of-intravitreally-injected-tissue-plasminogen-activator-a-rat-model-study
#5
Kfir Tal, Assaf Dotan, Yael Nisgav, Mor Dachbash, Orly Gal-Or, Rita Ehrlich, Dan D Gaton, Dov Weinberger, Tami Livnat
PURPOSE: To determine whether intravitreal unconjugated tissue plasminogen activator (tPA) (alteplase) can penetrate the intact neural retina and reach the subretinal space in an experimental model. METHODS: This study was performed in 24 Sprague-Dawley rats aged 12 weeks. Under general anesthesia, the right eye was injected with either 0.75 μg of 3 μL tPA (14 rats; study group) or saline (10 rats, control group) into the vitreous. Animals were euthanized at 3, 24, and 48 h...
July 20, 2017: Ophthalmic Research
https://www.readbyqxmd.com/read/28725968/microglial-mediated-pdgf-cc-activation-increases-cerebrovascular-permeability-during-ischemic-stroke
#6
Enming Joseph Su, Chunzhang Cao, Linda Fredriksson, Ingrid Nilsson, Christina Stefanitsch, Tamara K Stevenson, Juanjuan Zhao, Margret Ragsdale, Yu-Yo Sun, Manuel Yepes, Chia-Yi Kuan, Ulf Eriksson, Dudley K Strickland, Daniel A Lawrence, Li Zhang
Treatment of acute ischemic stroke with the thrombolytic tissue plasminogen activator (tPA) can significantly improve neurological outcomes; however, thrombolytic therapy is associated with an increased risk of intra-cerebral hemorrhage (ICH). Previously, we demonstrated that during stroke tPA acting on the parenchymal side of the neurovascular unit (NVU) can increase blood-brain barrier (BBB) permeability and ICH through activation of latent platelet-derived growth factor-CC (PDGF-CC) and signaling by the PDGF receptor-α (PDGFRα)...
July 19, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28723623/daurinol-blocks-breast-and-lung-cancer-metastasis-and-development-by-inhibition-of-focal-adhesion-kinase-fak
#7
Jong K Woo, Hyun J Jung, Ji-Youn Park, Ju-Hee Kang, Byung I Lee, DongYun Shin, Chu W Nho, Soo-Young Cho, Je K Seong, Seung H Oh
FAK overexpression has been reported in diverse primary and metastatic tumor tissues, supporting its pro-tumorigenic and pro-metastatic roles. Therefore, we have developed a neo-treatment strategy using daurinol to effectively treat cancer metastasis. Daurinol blocked cancer cell migration and invasion in vitro and exhibited anti-metastatic activity in an experimental metastasis model of breast and lung cancer. Daurinol selectively inhibited phosphorylation of FAK at Tyr925, Tyr576/577, and Tyr397 sites in a dose- and time-dependent manner...
July 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28722327/transforming-growth-factor-beta-matrix-metalloproteinases-and-urokinase-type-plasminogen-activator-interaction-in-the-cancer-epithelial-to-mesenchymal-transition
#8
REVIEW
Juan F Santibanez, Hristina Obradović, Tamara Kukolj, Jelena Krstić
Transforming growth factor beta (TGF-β) is a pleiotropic factor that acts as a tumor suppressor in the early stages, while it exerts tumor promoting activities in advanced stages of cancer development. One of the hallmarks of cancer progression is the capacity of cancer cells to migrate and invade surrounding tissues with subsequent metastasis to different organs. Matrix metalloproteinases (MMPs) together with urokinase-type plasminogen activator (uPA) and its receptor (uPAR), whose main original function described is the proteolytic degradation of the extracellular matrix, play key cellular roles in the enhancement of cell malignancy during cancer progression...
July 19, 2017: Developmental Dynamics: An Official Publication of the American Association of Anatomists
https://www.readbyqxmd.com/read/28721332/to-stent-or-not-to-stent-a-tale-of-two-occlusions
#9
Ali S Haider, Lyndon K Lee, Tijani Osumah, Saira Alli, Umair Khan, Steven Vayalumkal, Aida Kafai Golahmadi, Richa Thakur, Phu Nguyen, Kennith F Layton
Stenting and balloon angioplasty, along with mechanical thrombectomy, have gained notability as adjunctive treatment options to intravenous tissue plasminogen activator (IV-tPA) for tandem internal carotid artery (ICA) and middle cerebral artery (MCA) occlusions (TIM occlusions). Acute ischemic strokes (AISs) secondary to TIM occlusions are associated with poor patient outcomes primarily due to low recanalization rates following intravenous thrombolysis, consequently prompting the need for more invasive recanalization efforts...
June 17, 2017: Curēus
https://www.readbyqxmd.com/read/28720659/microbleeds-cerebral-hemorrhage-and-functional-outcome-after-stroke-thrombolysis-individual-patient-data-meta-analysis
#10
Andreas Charidimou, Guillaume Turc, Catherine Oppenheim, Shenqiang Yan, Jan F Scheitz, Hebun Erdur, Pascal P Klinger-Gratz, Marwan El-Koussy, Wakoh Takahashi, Yusuke Moriya, Duncan Wilson, Chelsea S Kidwell, Jeffrey L Saver, Asma Sallem, Solene Moulin, Myriam Edjlali-Goujon, Vincent Thijs, Zoe Fox, Ashkan Shoamanesh, Gregory W Albers, Heinrich P Mattle, Oscar R Benavente, H Rolf Jäger, Gareth Ambler, Junya Aoki, Jean-Claude Baron, Kazumi Kimura, Wataru Kakuda, Shunya Takizawa, Simon Jung, Christian H Nolte, Min Lou, Charlotte Cordonnier, David J Werring
BACKGROUND AND PURPOSE: We assessed whether the presence, number, and distribution of cerebral microbleeds (CMBs) on pre-intravenous thrombolysis MRI scans of acute ischemic stroke patients are associated with an increased risk of intracerebral hemorrhage (ICH) or poor functional outcome. METHODS: We performed an individual patient data meta-analysis, including prospective and retrospective studies of acute ischemic stroke treated with intravenous tissue-type plasminogen activator...
July 18, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28719063/enhanced-fibrinolysis-with-magnetically-powered-colloidal-microwheels
#11
Tonguc O Tasci, Dante Disharoon, Rogier M Schoeman, Kuldeepsinh Rana, Paco S Herson, David W M Marr, Keith B Neeves
Thrombi that occlude blood vessels can be resolved with fibrinolytic agents that degrade fibrin, the polymer that forms between and around platelets to provide mechanical stability. Fibrinolysis rates however are often constrained by transport-limited delivery to and penetration of fibrinolytics into the thrombus. Here, these limitations are overcome with colloidal microwheel (µwheel) assemblies functionalized with the fibrinolytic tissue-type plasminogen activator (tPA) that assemble, rotate, translate, and eventually disassemble via applied magnetic fields...
July 18, 2017: Small
https://www.readbyqxmd.com/read/28712618/would-a-large-tpa-trial-for-those-4-5-to-6-0-hours-from-stroke-onset-be-good-value-for-information
#12
Djøra I Soeteman, Nicolas A Menzies, Ankur Pandya
OBJECTIVES: To quantify the potential value of new research in patients treated with thrombolytic treatment (tissue-type plasminogen activator [tPA]) in the 4.5- to 6.0-hour time window after stroke onset and to determine the optimal size of a future trial using value of information analysis. METHODS: Expected value of partial perfect and sample information (EVPPI and EVSI) analyses were conducted using a probabilistic Markov model. Data for modified Rankin Scale (mRS) distributions in patients 4...
July 2017: Value in Health: the Journal of the International Society for Pharmacoeconomics and Outcomes Research
https://www.readbyqxmd.com/read/28712423/anxiety-and-depression-in-patients-three-months-after-myocardial-infarction-association-with-markers-of-coagulation-and-the-relevance-of-age
#13
Franziska Geiser, Anne Sarah Urbach, Ursula Harbrecht, Rupert Conrad, Bernd Pötzsch, Nele Amann, Katharina Kiesewetter, Alexandra Sieke, Kyra Wolffs, Dirk Skowasch
OBJECTIVE: Anxiety and depression are associated with an activation of coagulation and an impairment of fibrinolysis, which may contribute to the increased cardiovascular risk associated with the two disorders. However, very few studies have examined the impact of psychological distress on coagulation factors in coronary artery disease patients. The aim of this study was to assess the correlation between anxiety/depression and factors of coagulation and fibrinolysis in patients who had suffered an acute MI three months prior...
August 2017: Journal of Psychosomatic Research
https://www.readbyqxmd.com/read/28711275/chemotherapy-induced-stroke-mimic-5-fluorouracil-encephalopathy-fulfilling-criteria-for-tissue-plasminogen-activator-therapy
#14
May Thuy Nguyen, Robyn Stoianovici, Luigi Brunetti
Stroke mimics, especially those involving chemotherapy related neurotoxicity, can confound the clinical diagnosis of acute stroke. Here we describe the case of a 63year-old male with a recent history of stage IIIC colon cancer who presented with confusion on the second day of modified FOLFOX6 (5-fluorouracil/oxaliplatin) chemotherapy and subsequently received alteplase, tissue plasminogen activator therapy (tPA), for presumed ischemic stroke. Magnetic resonance imaging scans after tPA administration did not reveal evidence of an infarction and the patients' neurological symptoms resolved completely after discontinuation of 5-fluorouracil (5-FU)...
July 6, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28710283/amorphous-protein-aggregates-stimulate-plasminogen-activation-leading-to-release-of-cytotoxic-fragments-that-are-clients-for-extracellular-chaperones
#15
Patrick Constantinescu, Rebecca A Brown, Amy R Wyatt, Marie Ranson, Mark R Wilson
The misfolding of proteins and their accumulation in extracellular tissue compartments as insoluble amyloid or amorphous protein aggregates is a hallmark feature of many debilitating protein deposition diseases such as Alzheimers disease, prion diseases and type II diabetes. The plasminogen activation system (PAS) is best known as an extracellular fibrinolytic system, but was previously reported to also be capable of degrading amyloid fibrils. Here we show that amorphous protein aggregates interact with tPA and plasminogen, via an exposed lysine dependent mechanism, to efficiently generate plasmin...
July 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28710023/transient-brain-hypothermia-reduces-the-reperfusion-injury-of-delayed-tissue-plasminogen-activator-and-extends-its-therapeutic-time-window-in-a-focal-embolic-stroke-model
#16
Mohammadreza Zarisfi, Fatemeh Allahtavakoli, Mahsa Hassanipour, Mohammad Khaksari, Hossain Rezazadeh, Mohammad Allahtavakoli, Mohammad Mohsen Taghavi
It has been reported that restriction of reperfusion after thrombolytic therapy in ischemic stroke may reduce tissue plasminogen activator (tPA) adverse effects and extend its time window. We examined whether shortIt has been reported that restriction of reperfusion after thrombolytic therapy in ischemic stroke may reduce tissue plasminogen activator (tPA) adverse effects and extend its time window. We examined whether short-term and mild local brain cooling can prevent hyperemia and/or adverse effects of delayed tPA in rat embolic stroke model...
July 11, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28708523/timing-of-transcriptomic-and-proteomic-changes-in-the-bovine-placentome-after-parturition
#17
Anthony K McNeel, Jeff D Ondrak, Olivia L Amundson, Tara H Fountain, Elane C Wright, Katherine J Whitman, Carol G Chitko-McKown, Shuna A Jones, Chadwick C Chase, Robert A Cushman
Proper post-partum reproductive performance is important for reproductive efficiency in beef cows, and dystocia decreases post-partum fertility. Crossbred beef cows (n = 1676) were evaluated for lifetime performance based on degree of dystocia at presentation of the first calf. Cows that experienced moderate or severe dystocia produced fewer calves during their productive life (P < 0.01). The exact mechanism is unclear, but may be due to the contributions of dystocia to abnormal placental separation...
May 27, 2017: Theriogenology
https://www.readbyqxmd.com/read/28706119/disparities-and-trends-in-door-to-needle-time-the-fl-pr-cresd-study-florida-puerto-rico-collaboration-to-reduce-stroke-disparities
#18
Sofia A Oluwole, Kefeng Wang, Chuanhui Dong, Maria A Ciliberti-Vargas, Carolina M Gutierrez, Li Yi, Jose G Romano, Enmanuel Perez, Brittany Ann Tyson, Maranatha Ayodele, Negar Asdaghi, Hannah Gardener, David Z Rose, Enid J Garcia, Juan Carlos Zevallos, Dianne Foster, Mary Robichaux, Salina P Waddy, Ralph L Sacco, Tatjana Rundek
BACKGROUND AND PURPOSE: In the United States, about half of acute ischemic stroke patients treated with tPA (tissue-type plasminogen activator) receive treatment within 60 minutes of hospital arrival. We aimed to determine the proportion of patients receiving tPA within 60 minutes (door-to-needle time [DTNT] ≤60) and 45 minutes (DTNT ≤45) of hospital arrival by race/ethnicity and sex and to identify temporal trends in DTNT ≤60 and DTNT ≤45. METHODS: Among 65 654 acute ischemic stroke admissions in the National Institute of Neurological Disorders and Stroke-funded FL-PR CReSD study (Florida-Puerto Rico Collaboration to Reduce Stroke Disparities) from 2010 to 2015, we included 6181 intravenous tPA-treated cases (9...
July 13, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28705890/mechanical-thrombectomy-of-m1-and-m2-middle-cerebral-artery-occlusions
#19
Hisham Salahuddin, Guru Ramaiah, Diana E Slawski, Julie Shawver, Mark Buehler, Syed F Zaidi, Mouhammad Jumaa
BACKGROUND: Over half of patients who receive intravenous tissue plasminogen activator for middle cerebral artery division (MCA-M2) occlusion do not recanalize, leaving a large percentage of patients who may need mechanical thrombectomy (MT). However, the outcomes of MT for M2 occlusion have not been well characterized. OBJECTIVE: To determine if MT of M2 occlusion is as safe and efficacious as current standard-of-care MT for M1 occlusions. METHODS: With institutional review board approval, we retrospectively reviewed records of 212 patients undergoing MT for isolated MCA M1 or M2 occlusions during a 36-month period (Sept 2013 to Sept 2016) at two centres...
July 13, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28702878/recent-trends-in-clot-retrieval-devices-a-review
#20
REVIEW
Aamir Hameed, Haroon Zafar, Darren Mylotte, Faisal Sharif
Stroke is the second leading cause of death worldwide and in Europe. Even with gold standard medical management of acute ischemic stroke, which is intravenous (IV) thrombolysis by administration of recombinant tissue plasminogen activator (rt-PA), the mortality rate remains the same. Intra-arterial (IA) thrombolysis therapy also did not achieve significant results and was not approved by the US Food and Drug Administration (FDA) because of limited sample size. This encouraged scientists and engineers to develop endovascular clot retrieval devices for the mechanical recanalization of the occluded arteries in stroke patients...
July 12, 2017: Cardiology and Therapy
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