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Erythropoiesis

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https://www.readbyqxmd.com/read/28212192/genetic-control-of-erythropoiesis
#1
Laxminath Tumburu, Swee Lay Thein
PURPOSE OF REVIEW: The discovery of several genetic variants associated with erythroid traits and subsequent elucidation of their functional mechanisms are exemplars of the power of the new genetic and genomic technology. The present review highlights findings from recent genetic studies related to the control of erythropoiesis and dyserythropoiesis, and fetal hemoglobin, an erythroid-related trait. RECENT FINDINGS: Identification of the genetic modulators of erythropoiesis involved two approaches: genome-wide association studies (GWASs) using single nucleotide polymorphism (SNP) arrays that revealed the common genetic variants associated with erythroid phenotypes (hemoglobin, red cell count, MCV, MCH) and fetal hemoglobin; and massive parallel sequencing such as whole genome sequencing (WGS) and whole exome sequencing (WES) that led to the discovery of the rarer variants (GFI1B, SBDS, RPS19, PKLR, EPO, EPOR, KLF1, GATA1)...
February 15, 2017: Current Opinion in Hematology
https://www.readbyqxmd.com/read/28210260/from-the-cradle-to-the-grave-the-role-of-macrophages-in-erythropoiesis-and-erythrophagocytosis
#2
REVIEW
Thomas R L Klei, Sanne M Meinderts, Timo K van den Berg, Robin van Bruggen
Erythropoiesis is a highly regulated process where sequential events ensure the proper differentiation of hematopoietic stem cells into, ultimately, red blood cells (RBCs). Macrophages in the bone marrow play an important role in hematopoiesis by providing signals that induce differentiation and proliferation of the earliest committed erythroid progenitors. Subsequent differentiation toward the erythroblast stage is accompanied by the formation of so-called erythroblastic islands where a central macrophage provides further cues to induce erythroblast differentiation, expansion, and hemoglobinization...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28208125/mean-platelet-volume-in-heterozygous-beta-thalassaemia
#3
Mehmet Ali Cikrikcioglu, Kenan Celik, Iskender Ekinci, Muharrem Nasifov, Aybala Erek Toprak, Guven Cetin, Sema Genc
BACKGROUND/AIM: It is not known why cerebrovascular and cardiovascular ischaemic events are less frequently observed in heterozygous beta thalassaemia (HBT) patients than in the general population. However, we previously reported that serum levels of some platelet function markers, i.e. soluble CD40 ligand and soluble P-selectin, are lower in patients with HBT than in controls. A high mean platelet volume (MPV) is an indicator of in vivo platelet activation and may indicate a tendency to thrombosis...
February 17, 2017: Acta Haematologica
https://www.readbyqxmd.com/read/28203394/structural-features-of-bone-marrow
#4
REVIEW
Anatolii Romaniuk, Yuliia Lyndina, Vladyslav Sikora, Mykola Lyndin, Ludmyla Karpenko, Oksana Gladchenko, Igor Masalitin
PURPOSE: This article is devoted to the investigation of the structural features of the bone marrow of mature rats. MATERIALS AND METHODS: The investigation of the structural features of the bone marrow was performed on the femurs of the mature male rats. General structure of the organ was studied with hematoxylin-eosin and Van Gieson staining of samples. Certain features of the bone marrow structure were studied using immunohistochemical method (CD3, CD79α, S100, myeloperoxidase, and cyclin D1)...
September 2016: Interventional Medicine & Applied Science
https://www.readbyqxmd.com/read/28203295/management-of-anaemia-in-oncohaematological-patients-treated-with-biosimilar-epoetin-alfa-results-of-an-italian-observational-retrospective-study
#5
Giovanni Rosti, Mario Petrini, Alberto Bosi, Piero Galieni, Daniele Bernardi, Gianfranco Giglio, Laura Dorotea, Brunangelo Falini, Elvira Scelzi, Enzo Veltri, Roberto Castelli, Chiara Longagnani, Tommaso Raggi, Federico Simonetti
BACKGROUND: Many patients with solid tumours or nonmyeloid haematopoietic tumours develop symptomatic anaemia, which has a major impact on quality of life (QoL). The efficacy of erythropoiesis-stimulating agents (ESAs) in improving QoL and reducing blood transfusions has been widely demonstrated. Binocrit® (biosimilar epoetin alfa) is an ESA indicated in the European Union for treating chemotherapy-induced anaemia. The aim of this study was to investigate the effect of Binocrit® on haemoglobin (Hb) levels in anaemic cancer patients in Italian clinical practice...
January 2017: Therapeutic Advances in Medical Oncology
https://www.readbyqxmd.com/read/28195648/hematology-and-biochemistry-of-aging-evidence-of-anemia-of-the-elderly-in-old-dogs
#6
Lauren B Radakovich, Stephen C Pannone, Matthew P Truelove, Christine S Olver, Kelly S Santangelo
BACKGROUND: Effects of aging on hematologic and biochemical variables are well described in people. Anemia of the elderly is attributed to iron deficiency, anemia of chronic disease, chronic kidney disease, myelodysplasia, or idiopathic causes. Limited studies have examined these variables in aging dogs, but they have typically examined single breeds in research settings. OBJECTIVE: The objective of this study was to identify differences in CBC and biochemistry values between adult and aged dogs of many breeds...
February 13, 2017: Veterinary Clinical Pathology
https://www.readbyqxmd.com/read/28195425/carbon-nanotubes-disrupt-iron-homeostasis-and-induce-anemia-of-inflammation-through-inflammatory-pathway-as-a-secondary-effect-distant-to-their-portal-of-entry
#7
Juan Ma, Ruibin Li, Yin Liu, Guangbo Qu, Jing Liu, Wenli Guo, Haoyang Song, Xinghong Li, Yajun Liu, Tian Xia, Bing Yan, Sijin Liu
Although numerous toxicological studies have been performed on carbon nanotubes (CNTs), a few studies have investigated their secondary and indirect effects beyond the primary target tissues/organs. Here, a cascade of events are investigated: the initiating event and the subsequent key events necessary for the development of phenotypes, namely CNT-induced pro-inflammatory effects on iron homeostasis and red blood cell formation, which are linked to anemia of inflammation (AI). A panel of CNTs are prepared including pristine multiwall CNTs (P-MWCNTs), aminated MWCNTs (MWCNTs-NH2 ), polyethylene glycol MWCNTs (MWCNTs-PEG), polyethyleneimine MWCNTs (MWCNTs-PEI), and carboxylated MWCNTs (MWCNTs-COOH)...
February 13, 2017: Small
https://www.readbyqxmd.com/read/28193846/protein-4-1r-exon-16-3-splice-site-activation-requires-coordination-among-tia1-pcbp1-and-rbm39-during-terminal-erythropoiesis
#8
Shu-Ching Huang, Henry S Zhang, Brian Yu, Ellen McMahon, Dan T Nguyen, Faye H Yu, Alexander C Ou, Jennie Park Ou, Edward J Benz
Exon 16 of protein 4.1R encodes a spectrin/actin-binding peptide critical for erythrocyte membrane stability. Its expression during erythroid differentiation is regulated by alternative pre-mRNA splicing. A UUUUCCCCCC-motif situated between the branch point and the 3' splice site is crucial for inclusion. We show that the "UUUU" region and the last 3 C's in this motif are necessary for the binding of splicing factors TIA1 and Pcbp1, and that these proteins appear to act in a collaborative manner to enhance exon 16 inclusion...
February 13, 2017: Molecular and Cellular Biology
https://www.readbyqxmd.com/read/28193568/markers-of-iron-deficiency-in-patients-with-polycythemia-vera-receiving-ruxolitinib-or-best-available-therapy
#9
Srdan Verstovsek, Claire N Harrison, Jean-Jacques Kiladjian, Carole Miller, Ahmad B Naim, Dilan C Paranagama, Dany Habr, Alessandro M Vannucchi
Polycythemia vera (PV) is characterized by erythropoiesis and JAK2-activating mutations, with increased risks of morbidity and mortality. Most patients with PV are iron deficient, and treatment often includes hematocrit control with phlebotomy, which may exacerbate iron deficiency-associated complications. The phase 3 RESPONSE trial evaluated the JAK1/JAK2 inhibitor ruxolitinib (n=110) versus best available therapy (BAT; n=112) in patients with PV who were hydroxyurea-resistant/intolerant. Ruxolitinib was superior to BAT for hematocrit control, reduction in splenomegaly, and blood count normalization...
January 31, 2017: Leukemia Research
https://www.readbyqxmd.com/read/28193039/molecularly-imprinted-polymer-based-plasmonic-immunosandwich-assay-for-fast-and-ultrasensitive-determination-of-trace-glycoproteins-in-complex-samples
#10
Xueying Tu, Pir Muhammad, Jia Liu, Yanyan Ma, Shuangshou Wang, Danyang Yin, Zhen Liu
Glycoproteins play significant roles in many biological processes. Assays of glycoproteins have significant biological importance and clinical values, for which immunoassay has been the workhorse tool. However, immunoassay suffers from some disadvantages, such as poor availability of high-specificity antibodies and limited stability of biological reagents. Herein, we present an antibody-free and enzyme-free approach, called molecularly imprinted polymer (MIP)-based plasmonic immunosandwich assay (PISA), for fast and ultrasensitive detection of trace glycoproteins in complex samples...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28188131/momelotinib-inhibits-acvr1-alk2-decreases-hepcidin-production-and-ameliorates-anemia-of-chronic-disease-in-rodents
#11
Malte Asshoff, Verena Petzer, Matthew R Warr, David Haschka, Piotr Tymoszuk, Egon Demetz, Markus Seifert, Wilfried Posch, Manfred Nairz, Pat Maciejewski, Peter Fowles, Christopher J Burns, Gregg Smith, Kay-Uwe Wagner, Guenter Weiss, J Andrew Whitney, Igor Theurl
Patients with myelofibrosis (MF) often develop anemia and frequently become dependent on red blood cell transfusions. Results from a phase 2 study for the treatment of MF with the Janus kinase1/2 (JAK1/2) inhibitor momelotinib (MMB) demonstrated that MMB treatment ameliorated anemia, unexpected for a JAK1/2 inhibitor, as erythropoietin-mediated JAK2 signaling is essential for erythropoiesis. Using a rat model of anemia of chronic disease (ACD), we now demonstrate that MMB treatment can normalize hemoglobin and red blood cell numbers...
February 10, 2017: Blood
https://www.readbyqxmd.com/read/28186552/erythropoiesis-stimulating-agents-and-nephroprotection-is-there-any-room-for-new-trials
#12
Lucia Del Vecchio, Alessandro Zuccalà
No abstract text is available yet for this article.
February 1, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28186540/early-low-dose-erythropoiesis-stimulating-agent-therapy-and-progression-of-moderate-chronic-kidney-disease-a-randomized-placebo-controlled-trial
#13
Danilo Fliser, Frank Dellanna, Michael Koch, Alfons Wiggenhauser
No abstract text is available yet for this article.
February 1, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28185625/impact-of-erythropoiesis-stimulating-agents-on-behavioral-measures-in-children-born-preterm
#14
Jean R Lowe, Rebecca E Rieger, Natalia C Moss, Ronald A Yeo, Sarah Winter, Shrena Patel, John Phillips, Richard Campbell, Shawna Baker, Sean Gonzales, Robin K Ohls
OBJECTIVE: To evaluate the impact of erythropoiesis-stimulating agents (ESAs) administered during initial hospitalization and family demographic factors on behavior at 3.5-4 years of age. STUDY DESIGN: Children were enrolled who had previously participated in a randomized study of ESAs (n = 35) or placebo (n = 14) in infants born preterm with birth weights of 500-1250 g. A term healthy control group (n = 22) also was recruited. Behavior was evaluated by parent report with the Behavioral Assessment System of Children-2...
February 6, 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/28182038/study-of-anemia-in-nondialysis-dependent-chronic-kidney-disease-with-special-reference-to-serum-hepcidin
#15
H Goyal, S Mohanty, M Sharma, A Rani
We studied the role of serum hepcidin in anemia of chronic kidney disease (CKD) in a hospital-based cross-sectional study. Serum hepcidin, ferritin, and high-sensitivity C-reactive protein (hsCRP) levels were evaluated in patients of CKD. Hepcidin levels were increased in patients as compared to healthy adults. Hepcidin levels increased as CKD progressed through stage 3-5 (P trend = 0.015) but did not correlate with estimated glomerular filtration rate. Hepcidin correlated positively with ferritin (P < 0...
January 2017: Indian Journal of Nephrology
https://www.readbyqxmd.com/read/28181998/zinc-protoporphyrin-heme-ratio-as-parameter-of-iron-status-in-moderately-preterm-infants-natural-course-and-associations-in-the-first-4-months
#16
C G de Waal, L Uijterschout, M Abbink, B Boersma, P Vos, W W Rövekamp, F Hudig, M D Akkermans, J B van Goudoever, F Brus
OBJECTIVE: To determine the natural course of zinc protoporphyrin/heme ratio (ZnPP/H) and its role in the detection of iron deficiency (ID) and iron-deficiency anemia (IDA) in the first 4 months of life in moderately preterm infants. STUDY DESIGN: ZnPP/H was measured at 1 week, 6 weeks and 4 months postnatal age in a prospective cohort of 161 Dutch infants born at a gestational age of 32+0 to 36+6 weeks who did not receive an erythrocyte transfusion or iron supplementation...
February 9, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28179501/drug-discovery-for-diamond-blackfan-anemia-using-reprogrammed-hematopoietic-progenitors
#17
Sergei Doulatov, Linda T Vo, Elizabeth R Macari, Lara Wahlster, Melissa A Kinney, Alison M Taylor, Jessica Barragan, Manav Gupta, Katherine McGrath, Hsiang-Ying Lee, Jessica M Humphries, Alex DeVine, Anupama Narla, Blanche P Alter, Alan H Beggs, Suneet Agarwal, Benjamin L Ebert, Hanna T Gazda, Harvey F Lodish, Colin A Sieff, Thorsten M Schlaeger, Leonard I Zon, George Q Daley
Diamond-Blackfan anemia (DBA) is a congenital disorder characterized by the failure of erythroid progenitor differentiation, severely curtailing red blood cell production. Because many DBA patients fail to respond to corticosteroid therapy, there is considerable need for therapeutics for this disorder. Identifying therapeutics for DBA requires circumventing the paucity of primary patient blood stem and progenitor cells. To this end, we adopted a reprogramming strategy to generate expandable hematopoietic progenitor cells from induced pluripotent stem cells (iPSCs) from DBA patients...
February 8, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28167947/the-heme-connection-linking-erythrocytes-and-macrophage-biology
#18
REVIEW
Md Zahidul Alam, Samir Devalaraja, Malay Haldar
Erythroid function and development is intimately linked to macrophages. The primary function of erythrocytes is oxygen delivery, which is mediated by iron-containing hemoglobin. The major source of this iron is a recycling pathway where macrophages scavenge old and damaged erythrocytes to release iron contained within the heme moiety. Macrophages also promote erythropoiesis by providing a supportive niche in the bone marrow as an integral component of "erythorblastic islands." Importantly, inflammation leads to alterations in iron handling by macrophages with significant impact on iron homeostasis and erythropoiesis...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28167661/distinct-roles-for-tet-family-proteins-in-regulating-human-erythropoiesis
#19
Hongxia Yan, Yaomei Wang, Xiaoli Qu, Jie Li, John Hale, Yumin Huang, Chao An, Julien Papoin, Xinhua Guo, Lixiang Chen, Qiaozhen Kang, Wei Li, Vincent P Schulz, Patrick G Gallagher, Christopher D Hillyer, Narla Mohandas, Xiuli An
The TET family of proteins plays important roles in a wide range of biological processes by oxidizing 5-methylcytosine (5mC) to 5-hydroxy-methylcytosine (5hmC). However, their function in erythropoiesis has remained unclear. We show here that TET2 and TET3, but not TET1 are expressed in human erythroid cells and we explore the role of these proteins in erythropoiesis. Knockdown experiments revealed that TET2 and TET3 have different functions. Suppression of TET3 expression in human CD34(+) cells markedly impaired terminal erythroid differentiation, as reflected by increased apoptosis, generation of bi/multinucleated polychromatic/orthochromatic erythroblasts and impaired enucleation, though without effect on erythroid progenitors...
February 6, 2017: Blood
https://www.readbyqxmd.com/read/28166520/universal-sustained-viral-response-to-the-combination-of-ombitasvir-paritaprevir-ritonavir-and-dasabuvir-with-without-ribavirin-in-patients-on-hemodialysis-infected-with-hepatitis-c-virus-genotypes-1-and-4
#20
Soraya Abad, Almudena Vega, Eduardo Hernández, Evangelina Mérida, Patricia de Sequera, Marta Albalate, Nicolás Macías, Monica Milla, Juan M López-Gómez
BACKGROUND: Hepatitis C virus (HCV) infection is highly prevalent among patients on hemodialysis (HD) and is associated with poor prognosis. Treatment with interferon and ribavirin is poorly tolerated, and few data are available on the impact of new direct-acting antivirals (DAAs). This study was intended to analyze the efficacy and safety of treatment with a combination of ombitasvir/paritaprevir/ritonavir and dasabuvir with/without ribavirin in HCV-infected patients on HD from 3 hospitals...
January 7, 2017: American Journal of Nephrology
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