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https://www.readbyqxmd.com/read/28324743/visual-tracking-hot-pursuit-with-tiny-eyes
#1
Eric J Warrant
Flying insect predators intercept their aerial prey with deadly precision. New research reveals that a tiny robber fly, with a brain smaller than a pinhead, achieves this using the same visual mechanism that we ourselves employ to catch a passing ball.
March 20, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28323775/inadequate-antioxidative-responses-in-kidneys-of-brain-dead-rats
#2
Dane Hoeksma, Rolando A Rebolledo, Maximilia Hottenrott, Yves S Bodar, Janneke J Wiersema-Buist, Harry Van Goor, Henri G D Leuvenink
BACKGROUND: Brain death (BD)-related lipid peroxidation, measured as serum malondialdehyde (MDA) levels, correlates with delayed graft function in renal transplant recipients. How BD affects lipid peroxidation is not known. The extent of BD-induced organ damage is influenced by the speed at which intracranial pressure increases. To determine possible underlying causes of lipid peroxidation, we investigated the renal redox balance by assessing oxidative and antioxidative processes in kidneys of brain-dead rats after fast and slow BD induction...
April 2017: Transplantation
https://www.readbyqxmd.com/read/28323589/preventing-high-altitude-cerebral-edema-in-rats-with-repurposed-anti-angiogenesis-pharmacotherapy
#3
Samantha Tarshis, Joanne Maltzahn, Zoe Loomis, David C Irwin
BACKGROUND: High altitude cerebral edema (HACE) is a fulminant, deadly, and yet still unpredictable brain disease. A new prophylactic treatment for HACE and its predecessor, acute mountain sickness (AMS), needs to be developed without the contraindications or adverse effect profiles of acetazolamide and dexamethasone. Since neovascularization signals are likely key contributors to HACE/AMS, our approach was to examine already existing anti-angiogenic drugs to inhibit potential initiating HACE pathway(s)...
December 1, 2016: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28306143/mutant-eif2b-leads-to-impaired-mitochondrial-oxidative-phosphorylation-in-vanishing-white-matter-disease
#4
Gali Raini, Reut Sharet, Melisa Herrero, Andrea Atzmon, Anjana Shenoy, Tamar Geiger, Orna Elroy-Stein
Eukaryotic translation initiation factor 2B (eIF2B) is a master regulator of protein synthesis under normal and stress conditions. Mutations in any of the five genes encoding its subunits lead to Vanishing White Matter (VWM) disease, a recessive genetic deadly illness caused by progressive loss of white matter in the brain. In the current study we used fibroblasts, which are not involved in the disease, to demonstrate the involvement of eIF2B in mitochondrial function and abundance. Mass-spectrometry of total proteome of mouse embryonic fibroblasts (MEFs) isolated from Eif2b5(R132H/R132H) mice revealed unbalanced stoichiometry of proteins involved in oxidative phosphorylation and of mitochondrial translation machinery components, among others...
March 17, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28304181/computed-tomography-angiography-as-a-confirmatory-test-for-the-diagnosis-of-brain-death
#5
Mark P Garrett, Richard W Williamson, Michael A Bohl, C Roger Bird, Nicholas Theodore
OBJECTIVE For a diagnosis of brain death (BD), ancillary testing is performed if patient factors prohibit a complete clinical examination and apnea test. The American Academy of Neurology (AAN) guidelines identify cerebral angiography (CA), cerebral scintigraphy, electroencephalography, and transcranial Doppler ultrasonography as accepted ancillary tests. CA is widely considered the gold standard of these, as it provides the most reliable assessment of intracranial blood flow. CT angiography (CTA) is a noninvasive and widely available study that is also capable of identifying absent or severely diminished intracranial blood flow, but it is not included among the AAN's accepted ancillary tests because of insufficient evidence demonstrating its reliability...
March 17, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28292436/the-microenvironmental-landscape-of-brain-tumors
#6
REVIEW
Daniela F Quail, Johanna A Joyce
The brain tumor microenvironment (TME) is emerging as a critical regulator of cancer progression in primary and metastatic brain malignancies. The unique properties of this organ require a specific framework for designing TME-targeted interventions. Here, we discuss a number of these distinct features, including brain-resident cell types, the blood-brain barrier, and various aspects of the immune-suppressive environment. We also highlight recent advances in therapeutically targeting the brain TME in cancer...
March 13, 2017: Cancer Cell
https://www.readbyqxmd.com/read/28279348/structure-guided-identification-of-a-family-of-dual-receptor-binding-pfemp1-that-is-associated-with-cerebral-malaria
#7
Frank Lennartz, Yvonne Adams, Anja Bengtsson, Rebecca W Olsen, Louise Turner, Nicaise T Ndam, Gertrude Ecklu-Mensah, Azizath Moussiliou, Michael F Ofori, Benoit Gamain, John P Lusingu, Jens E V Petersen, Christian W Wang, Sofia Nunes-Silva, Jakob S Jespersen, Clinton K Y Lau, Thor G Theander, Thomas Lavstsen, Lars Hviid, Matthew K Higgins, Anja T R Jensen
Cerebral malaria is a deadly outcome of infection by Plasmodium falciparum, occurring when parasite-infected erythrocytes accumulate in the brain. These erythrocytes display parasite proteins of the PfEMP1 family that bind various endothelial receptors. Despite the importance of cerebral malaria, a binding phenotype linked to its symptoms has not been identified. Here, we used structural biology to determine how a group of PfEMP1 proteins interacts with intercellular adhesion molecule 1 (ICAM-1), allowing us to predict binders from a specific sequence motif alone...
March 8, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28266558/selective-induction-of-alternatively-spliced-fynt-isoform-by-tnf-facilitates-persistent-inflammatory-responses-in-astrocytes
#8
Chingli Lee, Clara Y B Low, Siew Ying Wong, Mitchell K P Lai, Michelle G K Tan
Fyn tyrosine kinase has been implicated in the pathogenesis of Alzheimer's disease (AD). We have previously reported that upregulation of the FynT isoform in AD brains was partly associated with astrocyte activation. In this study, we demonstrated selective FynT induction in murine cortex and primary astrocyte culture after prolonged exposure to inflammatory stimulants, suggesting that FynT may mediate persistent neuroinflammation. To delineate the functional role of astrocytic FynT in association with TNF-mediated inflammatory responses, immortalized normal human astrocytes (iNHA) stably expressing FynT kinase constitutively active (FynT-CA) or kinase dead (FynT-KD) mutants were treated with TNF and compared for inflammatory responses using high-throughput real-time RT-PCR and Luminex multi-analyte immunoassays...
March 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28266292/two-and-a-half-hours-of-cardiopulmonary-resuscitation-in-a-deceased-brain-dead-donor-before-liver-transplantation-a-good-idea-to-accept
#9
Dieter P Hoyer, Gernot M Kaiser, Andreas Paul, Nikolaos Machairas, Ernesto P Molmenti, Georgios C Sotiropoulos
The sequelae of cardiac arrest (CA) and cardiopulmonary resuscitation (CPR) in organ donors potentially results in ischemic organ injury and graft dysfunction after transplantation. Thresholds of resuscitation times in brain dead liver donors have not been established so far. We report the case of a brain dead liver donor who experienced 2.5 hours of CPR whose liver was successfully transplanted. A 75-year-old male experienced CA and was treated by CPR with streptokinase application for 2.5 hours until stabilization of cardiac function...
January 2017: Chirurgia
https://www.readbyqxmd.com/read/28264580/-ethical-aspects-of-uterus-transplantation
#10
Roman Chmel, Marta Nováčková, Zlatko Pastor, Jan Matěcha, Miloš Čekal, Jiří Froněk
Uterus transplantation is an experimental treatment method with an ambition to become accepted treatment modality for women with absolute uterine factor infertility. The only legal alternative for these women to get parenthood is adoption which is accepted by most world societies and countries. Surrogate pregnancy is connected with many medical, ethical, legal, religious and social controversies in the great part of the world.Donors (in living donation), recipients, partners and also unborn children must be incorporated into the analysis of ethical risks and benefits of uterus transplantation...
2017: Casopís Lékar̆ů C̆eských
https://www.readbyqxmd.com/read/28264063/acute-death-of-astrocytes-in-blast-exposed-rat-organotypic-hippocampal-slice-cultures
#11
Anna P Miller, Alok S Shah, Brandy V Aperi, Shekar N Kurpad, Brian D Stemper, Aleksandra Glavaski-Joksimovic
Blast traumatic brain injury (bTBI) affects civilians, soldiers, and veterans worldwide and presents significant health concerns. The mechanisms of neurodegeneration following bTBI remain elusive and current therapies are largely ineffective. It is important to better characterize blast-evoked cellular changes and underlying mechanisms in order to develop more effective therapies. In the present study, our group utilized rat organotypic hippocampal slice cultures (OHCs) as an in vitro system to model bTBI. OHCs were exposed to either 138 ± 22 kPa (low) or 273 ± 23 kPa (high) overpressures using an open-ended helium-driven shock tube, or were assigned to sham control group...
2017: PloS One
https://www.readbyqxmd.com/read/28260484/impact-of-a-full-time-donor-management-protocol-on-donors-liver-biopsy-findings-progress-to-date
#12
Meysam Mojtabaee, Alireza Shamsaeefar, Siavash Gholami, Mojtaba Mohsenzadeh, Farahnaz Sadegh Beigee
OBJECTIVES: This study investigated a fixed coordinator-directed donor management strategy's impact on donated liver quality, as determined by definitive biopsy results. MATERIALS AND METHODS: We collected donated liver biopsy results from donations both before and after implementing a fixed coordinator-directed donor management strategy. This strategy involved full-time attendance by a donor coordinator and continued resuscitation of brain-dead donors. All donations took place in a single organ procurement unit...
February 2017: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/28260448/pathology-results-at-autopsy-in-brain-dead-patients-with-brain-tumors
#13
Farahnaz Sadegh Beigee, Shagin Shahryari, Meysam Mojtabaee, Mihan Pourabdollah Toutkaboni
OBJECTIVES: Brain tumors are the most challenging causes of brain deaths due to the lack of pathology results in many cases. It is not uncommon to find a brain tumor in a brain-dead patient with no pathology results or neuroradiology reports available; this would exclude the deceased from organ donation. The mortality that occurs while patients are on transplant wait lists motivated us to find a solution to prevent losing brain-dead patients as potential donors. We present our experiences in autopsy examinations of brain tumors and the results of frozen-section pathology...
February 2017: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/28260435/role-of-more-active-identification-of-brain-dead-cases-in-increasing-organ-donation
#14
Farahnaz Sadegh Beigee, Mojtaba Mohsenzadeh, Shagin Shahryari, Meysam Mojtabaee
OBJECTIVES: Organ donor shortage is a worldwide problem, resulting in 10% to 30% mortality rates for patients on wait lists for organ transplant. For brain-dead patients in Iran, it is mandatory for intensive care unit patients with Glasgow Coma Scale below 5/15 to be reported to an organ procurement unit. However, this process has not been functioning effectively. Here, we present the effects of changing the strategies on detecting brain-dead cases on the organ donor pool. MATERIALS AND METHODS: From March 2015 to March 2016, we changed our strategy in active detection of brain-dead cases...
February 2017: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/28260434/difficult-consent-scale-an-assessment-scale-for-anticipated-difficulty-in-obtaining-consent-for-organ-donation
#15
Masoud Mazaheri, Farahnaz Sadegh Beigee
OBJECTIVES: Seeking consent for organ procurement from a brain-dead patient 's family is challenging, especially in developing countries. In the Middle East, legislation necessitates an opt-in system that engages all first-degree relatives. To improve our success rate in the Masih Daneshvari Organ Procurement Unit in Tehran, Iran, we invented a scale for the consent process to predict the degree of difficulty of each family interview before venturing into it. MATERIALS AND METHODS: We reviewed the records of brain-dead patients treated in our unit over the previous 10 years...
February 2017: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/28260423/organ-shortage-can-we-decrease-the-demand
#16
Antoine Stephan
The shortage of organs for transplant is a universal problem. The World Health Organization is urging every nation to seek self-sufficiency regarding their organ procurement program. Reaching self-sufficiency inevitably requires the provision of a well-developed deceased-donor organ procurement program. Most countries represented by the Middle East Society for Organ Transplantation still rely on living-donor organ donations. Some of these countries have been relatively successful in promoting deceased-donor donation as well...
February 2017: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/28252345/evidence-of-stress-in-%C3%AE-cells-obtained-with-laser-capture-microdissection-from-pancreases-of-brain-dead-donors
#17
Aref Ebrahimi, Min-Ho Jung, Jonathan M Dreyfuss, Hui Pan, Dennis Sgroi, Susan Bonner-Weir, Gordon C Weir
Isolated islets used for transplantation are known to be stressed, which can result from the circumstances of death, in particular brain death, the preservation of the pancreas with its warm and cold ischemia, from the trauma of the isolation process, and the complex events that occur during tissue culture. The current study focused upon the events that occur before the islet isolation procedure. Pancreases were obtained from brain dead donors (n = 7) with mean age 50 (11) and normal pancreatic tissue obtained at surgery done for pancreatic neoplasms (n = 7), mean age 69 (9)...
March 4, 2017: Islets
https://www.readbyqxmd.com/read/28246626/myocutaneous-mucormycosis-in-a-diabetic-burnt-patient-led-to-upper-extremity-amputation-a-case-report
#18
Mehdi Ayaz, Reza Moein
Mucormycosis is a rare opportunistic fungal infection that can implicate cranial sinuses, brain, lungs, gastrointestinal tract and skin. Although it can occur in patients with competent and incompetent immunity such as patients with diabetes mellitus, lymphoma, leukemia and burns, but it has an aggressive, malignant and lethal course in patients with incompetent immunity. To enforce the importance of burn in patients with underlaying diseases such as diabetes, we are going to report a rare case of diabetic burnt patient complicated by right upper extremity myocutaneous mucormycosis...
January 2017: Bulletin of Emergency and Trauma
https://www.readbyqxmd.com/read/28246131/the-effect-of-cortisol-in-rat-steatotic-and-non-steatoticliver-transplantation-from-brain-dead-donors
#19
Mónica Bibiana Jiménez-Castro, Elsa Negrete-Sánchez, Araní Casillas-Ramírez, Jose Gulfo, Ana I Álvarez-Mercado, Maria Eugenia Cornide-Petronio, Jordi Gracia-Sancho, Juan Rodés, Carmen Peralta
In this study, we examined the effects of cortisol on steatotic and non-steatotic liver grafts from brain-dead donors and characterized the underlying mechanisms involved. Non-steatotic liver grafts showed reduced cortisol and increased cortisone levels in association with upregulation of enzymes that inactivate cortisol. Conversely, steatotic liver grafts exhibited increased cortisol and reduced cortisone levels. The enzymes involved in cortisol generation were overexpressed, and those involved in cortisol inactivation or clearance were downregulated in steatotic liver grafts...
February 28, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28239302/parent-grief-1-13-months-after-death-in-neonatal-and-pediatric-intensive-care-units
#20
JoAnne M Youngblut, Dorothy Brooten, Joy Glaze, Teresita Promise, Changwon Yoo
OBJECTIVE: Describe changes in mothers' and fathers' grief from 1 to 13 months after infant/child neonatal/pediatric intensive care unit death and identify factors related to their grief. METHODS: Mothers (n = 130) and fathers (n = 52) of 140 children (newborn-18 years) completed the Hogan Grief Reaction Checklist at 1, 3, 6, and 13 months post-death. RESULTS: Grief decreased from 3 to 13 months for mothers and from 3 to 6 months for fathers...
2017: Journal of Loss & Trauma
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