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https://www.readbyqxmd.com/read/29614632/sickle-cell-dehydration-pathophysiology-and-therapeutic-applications
#1
Carlo Brugnara
Cell dehydration is a distinguishing characteristic of sickle cell disease and an important contributor to disease pathophysiology. Due to the unique dependence of Hb S polymerization on cellular Hb S concentration, cell dehydration promotes polymerization and sickling. In double heterozygosis for Hb S and C (SC disease) dehydration is the determining factor in disease pathophysiology. Three major ion transport pathways are involved in sickle cell dehydration: the K-Cl cotransport (KCC), the Gardos channel (KCNN4) and Psickle, the polymerization induced membrane permeability, most likely mediated by the mechano-sensitive ion channel PIEZO1...
2018: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/29504282/the-effect-of-xanthine-oxidase-and-hypoxanthine-on-the-permeability-of-red-cells-from-patients-with-sickle-cell-anemia
#2
Halima W M Al Balushi, David C Rees, John N Brewin, Anke Hannemann, John S Gibson
Red cells from patients with sickle cell anemia (SCA) are under greater oxidative challenge than those from normal individuals. We postulated that oxidants generated by xanthine oxidase (XO) and hypoxanthine (HO) contribute to the pathogenesis of SCA through altering solute permeability. Sickling, activities of the main red cell dehydration pathways (Psickle , Gardos channel, and KCl cotransporter [KCC]), and cell volume were measured at 100, 30, and 0 mmHg O2 , together with deoxygenation-induced nonelectrolyte hemolysis...
March 2018: Physiological Reports
https://www.readbyqxmd.com/read/29346256/causes-preventability-and-cost-of-unplanned-rehospitalizations-within-30-days-of-discharge-following-lung-transplantation
#3
Andrew M Courtwright, Derek Zaleski, Lisa Gardo, Vivek N Ahya, Jason D Christie, Maria Crespo, Denis Hadjiliadis, James Lee, Maria Molina, Namrata Patel, Mary Porteous, Edward E Cantu, Christian Bermudez, Joshua M Diamond
BACKGROUND: Unplanned rehospitalizations (UR) within 30 days of discharge are common following lung transplantation. It is unknown whether UR represent preventable gaps in care or necessary interventions for complex patients. The objective of this study was to assess the incidence, causes, risk factors, and preventability of UR following initial discharge after lung transplantation. METHODS: This was a single-center prospective cohort study. Subjects completed a modified Short Physical Performance Battery (SPPB) to assess frailty at listing and at initial hospital discharge after transplantation and the State-Trait Anxiety Inventory (STAI) at discharge...
January 18, 2018: Transplantation
https://www.readbyqxmd.com/read/29259557/red-blood-cell-passage-of-small-capillaries-is-associated-with-transient-ca-2-mediated-adaptations
#4
Jens G Danielczok, Emmanuel Terriac, Laura Hertz, Polina Petkova-Kirova, Franziska Lautenschläger, Matthias W Laschke, Lars Kaestner
When red blood cells (RBCs) pass constrictions or small capillaries they need to pass apertures falling well below their own cross section size. We used different means of mechanical stimulations (hypoosmotic swelling, local mechanical stimulation, passing through microfluidic constrictions) to observe cellular responses of human RBCs in terms of intracellular Ca2+ -signaling by confocal microscopy of Fluo-4 loaded RBCs. We were able to confirm our in vitro results in a mouse dorsal skinfold chamber model showing a transiently increased intracellular Ca2+ when RBCs were passing through small capillaries in vivo ...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29195706/longitudinal-study-of-user-experiences-of-a-cpoe-system-in-a-pediatric-hospital
#5
Melissa T Baysari, Rae-Anne Hardie, Rebecca Lake, Lauren Richardson, Cheryl McCullagh, Alan Gardo, Johanna Westbrook
OBJECTIVE: To explore the views of nurses and doctors during the early stages of implementation of a computerized provider order entry (CPOE) system in a pediatric hospital and to examine changes in perceptions and reported behaviors as use of the CPOE system became routine. METHODS: Semi-structured interviews were undertaken at four time points following CPOE implementation: during week one, week three, week six and then six months following implementation. In total, 122 users were interviewed...
January 2018: International Journal of Medical Informatics
https://www.readbyqxmd.com/read/29051181/disorders-of-erythrocyte-hydration
#6
REVIEW
Patrick G Gallagher
The erythrocyte contains a network of pathways that regulate salt and water content in the face of extracellular and intracellular osmotic perturbations. This allows the erythrocyte to maintain a narrow range of cell hemoglobin concentration, a process critical for normal red blood cell function and survival. Primary disorders that perturb volume homeostasis jeopardize the erythrocyte and may lead to its premature destruction. These disorders are marked by clinical, laboratory, and physiologic heterogeneity...
December 21, 2017: Blood
https://www.readbyqxmd.com/read/28986879/nmda-receptor-activity-in-circulating-red-blood-cells-methods-of-detection
#7
Asya Makhro, Lars Kaestner, Anna Bogdanova
Abundance and activity of N-methyl-D-aspartate (NMDA) in circulating red blood cells contributes to the maintenance of intracellular Ca(2+) in these cells and, by doing that, controls red cell volume, membrane stability, and O2 carrying capacity. Detection of the NMDA receptor activity in red blood cells is challenging as the number of its copies is low and shows substantial cell-to-cell heterogeneity. Receptor abundance is reliably assessed using the radiolabeled antagonist ([(3)H]MK-801) binding technique...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28932200/is-increased-intracellular-calcium-in-red-blood-cells-a-common-component-in-the-molecular-mechanism-causing-anemia
#8
Laura Hertz, Rick Huisjes, Esther Llaudet-Planas, Polina Petkova-Kirova, Asya Makhro, Jens G Danielczok, Stephane Egee, Maria Del Mar Mañú-Pereira, Richard van Wijk, Joan-Lluis Vives Corrons, Anna Bogdanova, Lars Kaestner
For many hereditary disorders, although the underlying genetic mutation may be known, the molecular mechanism leading to hemolytic anemia is still unclear and needs further investigation. Previous studies revealed an increased intracellular Ca(2+) in red blood cells (RBCs) from patients with sickle cell disease, thalassemia, or Gardos channelopathy. Therefore we analyzed RBCs' Ca(2+) content from 35 patients with different types of anemia (16 patients with hereditary spherocytosis, 11 patients with hereditary xerocytosis, 5 patients with enzymopathies, and 3 patients with hemolytic anemia of unknown cause)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28777785/erratum-mutational-landscape-of-metastatic-cancer-revealed-from-prospective-clinical-sequencing-of-10-000-patients
#9
Ahmet Zehir, Ryma Benayed, Ronak H Shah, Aijazuddin Syed, Sumit Middha, Hyunjae R Kim, Preethi Srinivasan, Jianjiong Gao, Debyani Chakravarty, Sean M Devlin, Matthew D Hellmann, David A Barron, Alison M Schram, Meera Hameed, Snjezana Dogan, Dara S Ross, Jaclyn F Hechtman, Deborah F DeLair, JinJuan Yao, Diana L Mandelker, Donavan T Cheng, Raghu Chandramohan, Abhinita S Mohanty, Ryan N Ptashkin, Gowtham Jayakumaran, Meera Prasad, Mustafa H Syed, Anoop Balakrishnan Rema, Zhen Y Liu, Khedoudja Nafa, Laetitia Borsu, Justyna Sadowska, Jacklyn Casanova, Ruben Bacares, Iwona J Kiecka, Anna Razumova, Julie B Son, Lisa Stewart, Tessara Baldi, Kerry A Mullaney, Hikmat Al-Ahmadie, Efsevia Vakiani, Adam A Abeshouse, Alexander V Penson, Philip Jonsson, Niedzica Camacho, Matthew T Chang, Helen H Won, Benjamin E Gross, Ritika Kundra, Zachary J Heins, Hsiao-Wei Chen, Sarah Phillips, Hongxin Zhang, Jiaojiao Wang, Angelica Ochoa, Jonathan Wills, Michael Eubank, Stacy B Thomas, Stuart M Gardos, Dalicia N Reales, Jesse Galle, Robert Durany, Roy Cambria, Wassim Abida, Andrea Cercek, Darren R Feldman, Mrinal M Gounder, A Ari Hakimi, James J Harding, Gopa Iyer, Yelena Y Janjigian, Emmet J Jordan, Ciara M Kelly, Maeve A Lowery, Luc G T Morris, Antonio M Omuro, Nitya Raj, Pedram Razavi, Alexander N Shoushtari, Neerav Shukla, Tara E Soumerai, Anna M Varghese, Rona Yaeger, Jonathan Coleman, Bernard Bochner, Gregory J Riely, Leonard B Saltz, Howard I Scher, Paul J Sabbatini, Mark E Robson, David S Klimstra, Barry S Taylor, Jose Baselga, Nikolaus Schultz, David M Hyman, Maria E Arcila, David B Solit, Marc Ladanyi, Michael F Berger
No abstract text is available yet for this article.
August 4, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28699687/the-super-sickling-haemoglobin-hbs-oman-a-study-of-red-cell-sickling-k-permeability-and-associations-with-disease-severity-in-patients-heterozygous-for-hba-and-hbs-oman-hba-s-oman-genotype
#10
Halima W M Al Balushi, Yasser Wali, Maha Al Awadi, Taimoora Al-Subhi, David C Rees, John N Brewin, Anke Hannemann, John S Gibson
Studying different sickle cell genotypes may throw light on the pathogenesis of sickle cell disease (SCD). Here, the clinical profile, red cell sickling and K+ permeability in 29 SCD patients (15 patients with severe disease and 14 with a milder form) of HbA/S-Oman genotype were analysed. The super sickling nature of this Hb variant was confirmed. The red cell membrane permeability to K+ was markedly abnormal with elevated activities of Psickle , Gardos channel and KCl cotransporter (KCC). Results were consistent with Ca2+ entry and Mg2+ loss via Psickle stimulating Gardos channel and KCC activities...
October 2017: British Journal of Haematology
https://www.readbyqxmd.com/read/28619848/red-blood-cell-gardos-channel-kcnn4-the-essential-determinant-of-erythrocyte-dehydration-in-hereditary-xerocytosis
#11
LETTER
Raphaël Rapetti-Mauss, Véronique Picard, Corinne Guitton, Khaldoun Ghazal, Valérie Proulle, Catherine Badens, Olivier Soriani, Loïc Garçon, Hélène Guizouarn
No abstract text is available yet for this article.
October 2017: Haematologica
https://www.readbyqxmd.com/read/28496185/-gardos-channelopathy-a-variant-of-hereditary-stomatocytosis-with-complex-molecular-regulation
#12
Elisa Fermo, Anna Bogdanova, Polina Petkova-Kirova, Anna Zaninoni, Anna Paola Marcello, Asya Makhro, Pascal Hänggi, Laura Hertz, Jens Danielczok, Cristina Vercellati, Nadia Mirra, Alberto Zanella, Agostino Cortelezzi, Wilma Barcellini, Lars Kaestner, Paola Bianchi
The Gardos channel is a Ca(2+) sensitive, K(+) selective channel present in several tissues including RBCs, where it is involved in cell volume regulation. Recently, mutations at two different aminoacid residues in KCNN4 have been reported in patients with hereditary xerocytosis. We identified by whole exome sequencing a new family with two members affected by chronic hemolytic anemia carrying mutation R352H in the KCNN4 gene. No additional mutations in genes encoding for RBCs cytoskeletal, membrane or channel proteins were detected...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28481359/mutational-landscape-of-metastatic-cancer-revealed-from-prospective-clinical-sequencing-of-10-000-patients
#13
Ahmet Zehir, Ryma Benayed, Ronak H Shah, Aijazuddin Syed, Sumit Middha, Hyunjae R Kim, Preethi Srinivasan, Jianjiong Gao, Debyani Chakravarty, Sean M Devlin, Matthew D Hellmann, David A Barron, Alison M Schram, Meera Hameed, Snjezana Dogan, Dara S Ross, Jaclyn F Hechtman, Deborah F DeLair, JinJuan Yao, Diana L Mandelker, Donavan T Cheng, Raghu Chandramohan, Abhinita S Mohanty, Ryan N Ptashkin, Gowtham Jayakumaran, Meera Prasad, Mustafa H Syed, Anoop Balakrishnan Rema, Zhen Y Liu, Khedoudja Nafa, Laetitia Borsu, Justyna Sadowska, Jacklyn Casanova, Ruben Bacares, Iwona J Kiecka, Anna Razumova, Julie B Son, Lisa Stewart, Tessara Baldi, Kerry A Mullaney, Hikmat Al-Ahmadie, Efsevia Vakiani, Adam A Abeshouse, Alexander V Penson, Philip Jonsson, Niedzica Camacho, Matthew T Chang, Helen H Won, Benjamin E Gross, Ritika Kundra, Zachary J Heins, Hsiao-Wei Chen, Sarah Phillips, Hongxin Zhang, Jiaojiao Wang, Angelica Ochoa, Jonathan Wills, Michael Eubank, Stacy B Thomas, Stuart M Gardos, Dalicia N Reales, Jesse Galle, Robert Durany, Roy Cambria, Wassim Abida, Andrea Cercek, Darren R Feldman, Mrinal M Gounder, A Ari Hakimi, James J Harding, Gopa Iyer, Yelena Y Janjigian, Emmet J Jordan, Ciara M Kelly, Maeve A Lowery, Luc G T Morris, Antonio M Omuro, Nitya Raj, Pedram Razavi, Alexander N Shoushtari, Neerav Shukla, Tara E Soumerai, Anna M Varghese, Rona Yaeger, Jonathan Coleman, Bernard Bochner, Gregory J Riely, Leonard B Saltz, Howard I Scher, Paul J Sabbatini, Mark E Robson, David S Klimstra, Barry S Taylor, Jose Baselga, Nikolaus Schultz, David M Hyman, Maria E Arcila, David B Solit, Marc Ladanyi, Michael F Berger
Tumor molecular profiling is a fundamental component of precision oncology, enabling the identification of genomic alterations in genes and pathways that can be targeted therapeutically. The existence of recurrent targetable alterations across distinct histologically defined tumor types, coupled with an expanding portfolio of molecularly targeted therapies, demands flexible and comprehensive approaches to profile clinically relevant genes across the full spectrum of cancers. We established a large-scale, prospective clinical sequencing initiative using a comprehensive assay, MSK-IMPACT, through which we have compiled tumor and matched normal sequence data from a unique cohort of more than 10,000 patients with advanced cancer and available pathological and clinical annotations...
June 2017: Nature Medicine
https://www.readbyqxmd.com/read/27797997/stepped-wedge-cluster-randomised-controlled-trial-to-assess-the-effectiveness-of-an-electronic-medication-management-system-to-reduce-medication-errors-adverse-drug-events-and-average-length-of-stay-at-two-paediatric-hospitals-a-study-protocol
#14
RANDOMIZED CONTROLLED TRIAL
J I Westbrook, L Li, M Z Raban, M T Baysari, V Mumford, M Prgomet, A Georgiou, T Kim, R Lake, C McCullagh, L Dalla-Pozza, J Karnon, T A O'Brien, G Ambler, R Day, C T Cowell, M Gazarian, R Worthington, C U Lehmann, L White, D Barbaric, A Gardo, M Kelly, P Kennedy
INTRODUCTION: Medication errors are the most frequent cause of preventable harm in hospitals. Medication management in paediatric patients is particularly complex and consequently potential for harms are greater than in adults. Electronic medication management (eMM) systems are heralded as a highly effective intervention to reduce adverse drug events (ADEs), yet internationally evidence of their effectiveness in paediatric populations is limited. This study will assess the effectiveness of an eMM system to reduce medication errors, ADEs and length of stay (LOS)...
October 21, 2016: BMJ Open
https://www.readbyqxmd.com/read/27771709/novel-insights-in-the-regulation-of-phosphatidylserine-exposure-in-human-red-blood-cells
#15
Mauro C Wesseling, Lisa Wagner-Britz, Duc Bach Nguyen, Salome Asanidze, Judy Mutua, Nagla Mohamed, Benjamin Hanf, Mehrdad Ghashghaeinia, Lars Kaestner, Ingolf Bernhardt
BACKGROUND/AIMS: In previous publications we were able to demonstrate the exposure of phosphatidylserine (PS) in the outer membrane leaflet after activation of red blood cells (RBCs) by lysophosphatidic acid (LPA), phorbol-12 myristate-13acetate (PMA), or 4-bromo-A23187 (A23187). It has been concluded that three different mechanisms are responsible for the PS exposure in human RBCs: (i) Ca2+-stimulated scramblase activation (and flippase inhibition) by A23187, LPA, and PMA; (ii) PKCα activation by LPA and PMA; and (iii) enhanced lipid flip flop caused by LPA...
2016: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/27756835/new-insights-on-hereditary-erythrocyte-membrane-defects
#16
REVIEW
Immacolata Andolfo, Roberta Russo, Antonella Gambale, Achille Iolascon
After the first proposed model of the red blood cell membrane skeleton 36 years ago, several additional proteins have been discovered during the intervening years, and their relationship with the pathogenesis of the related disorders have been somewhat defined. The knowledge of erythrocyte membrane structure is important because it represents the model for spectrin-based membrane skeletons in all cells and because defects in its structure underlie multiple hemolytic anemias. This review summarizes the main features of erythrocyte membrane disorders, dividing them into structural and altered permeability defects, focusing particularly on the most recent advances...
November 2016: Haematologica
https://www.readbyqxmd.com/read/27443288/senicapoc-a-potent-candidate-for-the-treatment-of-a-subset-of-hereditary-xerocytosis-caused-by-mutations-in-the-gardos-channel
#17
LETTER
Raphael Rapetti-Mauss, Olivier Soriani, Henri Vinti, Catherine Badens, Hélène Guizouarn
No abstract text is available yet for this article.
November 2016: Haematologica
https://www.readbyqxmd.com/read/27372866/a-hypothesis-of-target-cell-formation-in-sickle-cell-disease
#18
P Wong
A fraction of erythrocytes appear as target cells in stained blood smears in sickle cell disease, due to a inheritance of the hemoglobin variant Hb S, polymerizing upon deoxygenation. These cells appear in a three dimension as thin cups. A process of their formation in this disease is proposed based on a band 3-based mechanism of the erythrocyte shape control, able to explain the erythrocyte echinocytosis by glucose depletion. It indicates that their formation is due to a stomatocytogenic slow outward transport of the dibasic form of endogenous Pi with an H(+) by band 3, promoted by the decrease of the Donnan ratio, which decreases cell pH and volume, attributed by a decrease of cell KCl concentration by the higher efflux of K(+)Cl(-) cotransport and Ca(2+) activation of the Gardos channel...
August 2016: Medical Hypotheses
https://www.readbyqxmd.com/read/27353637/advances-in-understanding-the-pathogenesis-of-the-red-cell-volume-disorders
#19
REVIEW
Catherine Badens, Hélène Guizouarn
Genetic defects of erythrocyte transport proteins cause disorders of red blood cell volume that are characterized by abnormal permeability to the cations Na(+) and K(+) and, consequently, by changes in red cell hydration. Clinically, these disorders are associated with chronic haemolytic anaemia of variable severity and significant co-morbidities, such as iron overload. This review provides an overview of recent insights into the molecular basis of this group of rare anaemias involving cation channels and transporters dysfunction...
September 2016: British Journal of Haematology
https://www.readbyqxmd.com/read/27016727/automated-eligibility-screening-and-monitoring-for-genotype-driven-precision-oncology-trials
#20
Michael H Eubank, David M Hyman, Amritha D Kanakamedala, Stuart M Gardos, Jonathan M Wills, Peter D Stetson
The Information Systems Department at Memorial Sloan Kettering Cancer Center developed the DARWIN Cohort Management System (DCMS). The DCMS identifies and tracks cohorts of patients based on genotypic and clinical data. It assists researchers and treating physicians in enrolling patients to genotype-matched IRB-approved clinical trials. The DCMS sends automated, actionable, and secure email notifications to users with information about eligible or enrolled patients before their upcoming appointments. The system also captures investigators input via annotations on patient eligibility and preferences on future status updates...
July 2016: Journal of the American Medical Informatics Association: JAMIA
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