keyword
MENU ▼
Read by QxMD icon Read
search

NTBI

keyword
https://www.readbyqxmd.com/read/29748130/effects-of-the-iron-chelator-deferiprone-and-the-t-type-calcium-channel-blocker-efonidipine-on-cardiac-function-and-ca-2-regulation-in-iron-overloaded-thalassemic-mice
#1
Juthamas Khamseekaew, Sirinart Kumfu, Siripong Palee, Suwakon Wongjaikam, Somdet Srichairatanakool, Suthat Fucharoen, Siriporn C Chattipakorn, Nipon Chattipakorn
Although disturbance of cardiac Ca2+ regulation is involved in the pathophysiology of iron-overload cardiomyopathy, the obvious mechanisms involved in the dysregulation of iron-induced cardiac Ca2+ are unclear. Moreover, the roles of the iron chelator deferiprone and the T-type calcium channel blocker efonidipine on cardiac intracellular Ca2+ transients and Ca2+ regulatory proteins in thalassemic mice are still unknown. We tested the hypothesis that treatment with either deferiprone or efonidipine attenuated cardiac Ca2+ dysregulation and led to improved left ventricular (LV) function in iron-overloaded thalassemic mice...
February 6, 2018: Cell Calcium
https://www.readbyqxmd.com/read/29735522/hepcidin-protects-against-lethal-e-coli-sepsis-in-mice-inoculated-with-isolates-from-septic-patients
#2
Deborah Stefanova, Antoan Raychev, Jaime Deville, Romney Humphries, Shelley Campeau, Piotr Ruchala, Elizabeta Nemeth, Tomas Ganz, Yonca Bulut
Iron is an essential micronutrient for most microbes and their hosts. Mammalian hosts respond to infection by inducing the iron-regulatory hormone hepcidin, which causes iron sequestration and a rapid decrease in plasma and extracellular iron concentration (hypoferremia). Previous studies showed that hepcidin regulation of iron is essential for protection from infection-associated mortality with the siderophilic pathogens Yersinia enterocolitica and Vibrio vulnificus However, the evolutionary conservation of the hypoferremic response to infection suggests that not only rare siderophilic bacteria but also common pathogens may be targeted by this mechanism...
May 7, 2018: Infection and Immunity
https://www.readbyqxmd.com/read/29725640/oral-ferric-citrate-hydrate-associated-with-less-oxidative-stress-than-intravenous-saccharated-ferric-oxide
#3
Masaaki Nakayama, Yoshihiro Tani, Wan-Jun Zhu, Kimio Watanabe, Keitaro Yokoyama, Masafumi Fukagawa, Takashi Akiba, Myles Wolf, Hideki Hirakata
Introduction: A recent study suggested that orally dosed ferric citrate hydrate (FC) corrects renal anemia in patients on hemodialysis (HD), suggesting biological differences in effects of iron supplementation using different routes of administration. To address this issue, the present study compared oral FC with i.v. saccharated ferric oxide (FO) in stable HD patients. Methods: Participants comprised 6 patients administered 3 consecutive protocols in the first HD session of the week in a fasting state: nothing given, as control (C); oral load of FC (480 mg iron), and 5 minutes of i...
March 2018: KI Reports
https://www.readbyqxmd.com/read/29610275/inflammation-induced-iron-transport-and-metabolism-by-brain-microglia
#4
Ryan C McCarthy, Jose Carlo Sosa, Andrew M Gardeck, Andrew S Baez, Chih-Hao Lee, Marianne Wessling-Resnick
Microglia are immune cells of the central nervous system and are implicated in brain inflammation. However, how brain microglia modulate transport and metabolism of the essential metal iron in response to pro- and anti-inflammatory environmental cues is unclear. Here, we characterized uptake of transferrin (Tf)-bound iron (TBI) and non-Tf-bound iron (NTBI) by immortalized microglial (IMG) cells. We found that these cells preferentially take up NTBI in response to the proinflammatory stimulus lipopolysaccharide (LPS) or amyloid-beta (Aβ)...
April 2, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29490098/the-multiple-faces-of-the-metal-transporter-zip14-slc39a14
#5
Tolunay B Aydemir, Robert J Cousins
The SLC39A family of metal transporters was identified through homologies with the Zrt- and Irt-like (ZIP) proteins from yeast and plants. Of all the ZIP transporters, ZIP14 is arguably the most robustly characterized in terms of function at the integrative level. Mice with a global knockout of Zip14 are viable, thus providing the opportunity to conduct physiologic experiments. In mice, Zip14 expression is highly tissue specific, with the greatest abundance in the jejunum > liver > heart > kidney > white adipose tissue > skeletal muscle > spleen > pancreas...
February 1, 2018: Journal of Nutrition
https://www.readbyqxmd.com/read/29341909/nanogel-dfo-conjugates-as-a-model-to-investigate-pharmacokinetics-biodistribution-and-iron-chelation-in-vivo
#6
Yan Wang, Zhi Liu, Tien-Min Lin, Shaurya Chanana, May P Xiong
Deferoxamine (DFO) to treat iron overload (IO) has been limited by toxicity issues and short circulation times and it would be desirable to prolong circulation to improve non-transferrin bound iron (NTBI) chelation. In addition, DFO is currently unable to efficiently target the large pool of iron in the liver and spleen. Nanogel-Deferoxamine conjugates (NG-DFO) can prove useful as a model to investigate the pharmacokinetic (PK) properties and biodistribution (BD) behavior of iron-chelating macromolecules and their overall effect on serum ferritin levels...
January 13, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29330222/increased-sympathovagal-imbalance-evaluated-by-heart-rate-variability-is-associated-with-decreased-t2-mri-and-left-ventricular-function-in-transfusion-dependent-thalassemia-patients
#7
Sintip Pattanakuhar, Arintaya Phrommintikul, Adisak Tantiworawit, Sasikarn Konginn, Somdet Srichairattanakool, Siriporn C Chattipakorn, Nipon Chattipakorn
Early detection of iron overload cardiomyopathy is an important strategy for decreasing the mortality rate of patients with transfusion-dependent thalassemia (TDT). Although cardiac magnetic resonance (CMR) T2* is effective in detecting cardiac iron deposition, it is costly and not generally available. We investigated whether heart rate variability (HRV) can be used as a screening method of iron overload cardiomyopathy in TDT patients. HRV, evaluated by 24-h Holter monitoring, non-transferrin bound iron (NTBI), serum ferritin, left ventricular (LV) ejection fraction (LVEF), and CMR-T2* were determined...
February 28, 2018: Bioscience Reports
https://www.readbyqxmd.com/read/29318368/increased-levels-of-advanced-glycation-end-products-positively-correlate-with-iron-overload-and-oxidative-stress-markers-in-patients-with-%C3%AE-thalassemia-major
#8
Maryam Sadat Mirlohi, Hamid Yaghooti, Saeed Shirali, Ali Aminasnafi, Samaneh Olapour
The impaired biosynthesis of the β-globin chain in β-thalassemia leads to the accumulation of unpaired alpha globin chains, failure in hemoglobin formation, and iron overload due to frequent blood transfusion. Iron excess causes oxidative stress and massive tissue injuries. Advanced glycation end products (AGEs) are harmful agents, and their production accelerates in oxidative conditions. This study was conducted on 45 patients with major β-thalassemia who received frequent blood transfusions and chelation therapy and were compared to 40 healthy subjects...
April 2018: Annals of Hematology
https://www.readbyqxmd.com/read/28738026/effect-of-red-blood-cell-storage-time-on-markers-of-hemolysis-and-inflammation-in-transfused-very-low-birth-weight-infants
#9
Tamara G Kalhan, David A Bateman, Rakhee M Bowker, Eldad A Hod, Sudha Kashyap
BackgroundProlonged storage of transfused red blood cells (RBCs) is associated with hemolysis in healthy adults and inflammation in animal models. We aimed to determine whether storage duration affects markers of hemolysis (e.g., serum bilirubin, iron, and non-transferrin-bound iron (NTBI)) and inflammation (e.g., interleukin (IL)-8 and monocyte chemoattractant protein (MCP)-1) in transfused very low birth weight (VLBW) infants.MethodsBlood samples from 23 independent transfusion events were collected by heel stick before and 2-6 h after transfusion...
December 2017: Pediatric Research
https://www.readbyqxmd.com/read/28731917/the-impact-of-iron-overload-in-acute-leukemia-chronic-inflammation-but-not-the-presence-of-nontransferrin-bound-iron-is-a-determinant-of-oxidative-stress
#10
Lale Olcay, Mustafa Serteser, Murat Kolay, Havva F Balci, Ülkü M Yildirim, Sibel A Tekgündüz, Tuncay Hazirolan, Yunus K Terzi
In the literature, studies on the oxidant effects of nontransferrin bound iron [NTBI (eLPI assay)] during chemotherapy of acute lymphoblastic leukemia and acute myeloblastic leukemia are lacking. We established NTBI and oxidative stress determinants (OSD), iron parameters, high-sensitive C-reactive protein (hs-CRP) levels, liver tests, cumulative chemotherapeutic doses, and transfused blood in 36 children with acute leukemia throughout chemotherapy. These parameters were determined at the beginning and end of chemotherapy blocks (11 time points) and in 20 healthy children using enzyme-linked immunosorbent assay, and colorimetric and fluorometric enzymatic methods...
August 2017: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/28694024/iron-metabolism-state-of-the-art
#11
R Daher, Z Karim
Iron homeostasis relies on the amount of its absorption by the intestine and its release from storage sites, the macrophages. Iron homeostasis is also dependent on the amount of iron used for the erythropoiesis. Hepcidin, which is synthesized predominantly by the liver, is the main regulator of iron metabolism. Hepcidin reduces serum iron by inhibiting the iron exporter, ferroportin expressed both tissues, the intestine and the macrophages. In addition, in the enterocytes, hepcidin inhibits the iron influx by acting on the apical transporter, DMT1...
September 2017: Transfusion Clinique et Biologique: Journal de la Société Française de Transfusion Sanguine
https://www.readbyqxmd.com/read/28607992/no-dependent-programmed-cell-death-is-involved-in-the-formation-of-zn-related-lesions-in-tobacco-leaves
#12
Aleksandra Weremczuk, Anna Ruszczyńska, Ewa Bulska, Danuta Maria Antosiewicz
A recent study indicated that the development of lesions on the leaf blades of tobacco exposed to zinc (Zn) excess can be considered a manifestation of a Zn-tolerance strategy at the organ level. Here, we investigated whether cell death leading to the formation of localized lesions is destructive in character (necrosis type) or results from programmed self-induced cell death (PCD). Selected parameters, including PCD markers, were determined in the leaves from tobacco plants grown in the presence of 200 μM Zn and compared with control conditions...
July 19, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28585071/impact-of-non-transferrin-bound-iron-ntbi-in-comparison-to-serum-ferritin-on-outcome-after-allogeneic-stem-cell-transplantation-asct
#13
COMPARATIVE STUDY
Annekathrin Hilken, Claudia Langebrake, Christine Wolschke, Jan Felix Kersten, Holger Rohde, Peter Nielsen, Nicolaus Kröger
The optimal parameters and time points for the measurement of iron overload (IO) in allogeneic stem cell transplantation (ASCT) patients are still under discussion. Hyperferritinemia and IO are poor prognostic factors in ASCT. We hypothesize that non-transferrin-bound iron (NBTI) is possibly a better marker to predict the effect of IO on the outcome than serum ferritin (SF), which however is not specific for IO. The aim of this prospective observational trial was to evaluate the influence of NBTI in comparison to SF on the outcome of ASCT patients [overall survival, bloodstream infections (BSIs), and invasive fungal infections (IFIs)]...
August 2017: Annals of Hematology
https://www.readbyqxmd.com/read/28573162/measurement-of-transferrin-and-non-transferrin-bound-iron-uptake-by-mouse-tissues
#14
Supak Jenkitkasemwong, Chia-Yu Wang, Mitchell D Knutson
Iron in blood plasma is bound to its transport protein transferrin, which delivers iron to most tissues. In iron overload and certain pathological conditions, the carrying capacity of transferrin can become exceeded, giving rise to non-transferrin-bound iron, which is taken up preferentially by the liver, kidney, pancreas, and heart. The measurement of tissue transferrin- and non-transferrin-bound iron (TBI and NTBI, respectively) uptake in vivo can be achieved via intravenous administration of (59)Fe-labeled TBI or NTBI followed by gamma counting of various organs...
September 5, 2016: Bio-protocol
https://www.readbyqxmd.com/read/28550259/transport-of-non-transferrin-bound-iron-to-the-brain-implications-for-alzheimer-s-disease
#15
Ajai K Tripathi, Shilpita Karmakar, Abhishek Asthana, Ajay Ashok, Vilok Desai, Shounak Baksi, Neena Singh
A direct correlation between brain iron and Alzheimer's disease (AD) raises questions regarding the transport of non-transferrin-bound iron (NTBI), a toxic but less researched pool of circulating iron that is likely to increase due to pathological and/or iatrogenic systemic iron overload. Here, we compared the distribution of radiolabeled-NTBI (59Fe-NTBI) and transferrin-bound iron (59Fe-Tf) in mouse models of iron overload in the absence or presence of inflammation. Following a short pulse, most of the 59Fe-NTBI was taken up by the liver, followed by the kidney, pancreas, and heart...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28469086/iron-accelerates-hemoglobin-oxidation-increasing-mortality-in-vascular-diseased-guinea-pigs-following-transfusion-of-stored-blood
#16
Jin Hyen Baek, Ayla Yalamanoglu, Yamei Gao, Ricardo Guenster, Donat R Spahn, Dominik J Schaer, Paul W Buehler
Non-transferrin-bound iron (NTBI) and free hemoglobin (Hb) accumulate in circulation following stored RBC transfusions. This study investigated transfusion, vascular disease, and mortality in guinea pigs after stored RBC transfusion alone and following cotransfusion with apo-transferrin (apo-Tf) and haptoglobin (Hp). The effects of RBC exchange transfusion dose (1, 3, and 9 units), storage period (14 days), and mortality were evaluated in guinea pigs with a vascular disease phenotype. Seven-day mortality and the interaction between iron and Hb as cocontributors to adverse outcome were studied...
May 4, 2017: JCI Insight
https://www.readbyqxmd.com/read/28465342/endogenous-hepcidin-and-its-agonist-mediate-resistance-to-selected-infections-by-clearing-non-transferrin-bound-iron
#17
Deborah Stefanova, Antoan Raychev, Joao Arezes, Piotr Ruchala, Victoria Gabayan, Mikael Skurnik, Barbara J Dillon, Marcus A Horwitz, Tomas Ganz, Yonca Bulut, Elizabeta Nemeth
The iron-regulatory hormone hepcidin is induced early in infection, causing iron sequestration in macrophages and decreased plasma iron; this is proposed to limit the replication of extracellular microbes, but could also promote infection with macrophage-tropic pathogens. The mechanisms by which hepcidin and hypoferremia modulate host defense, and the spectrum of microbes affected, are poorly understood. Using mouse models, we show that hepcidin was selectively protective against siderophilic extracellular pathogens ( Yersinia enterocolitica O9) by controlling non-transferrin-bound iron (NTBI) rather than iron-transferrin concentration...
July 20, 2017: Blood
https://www.readbyqxmd.com/read/28261264/ferrous-iron-up-regulation-in-fibroblasts-of-patients-with-beta-propeller-protein-associated-neurodegeneration-bpan
#18
Rosaria Ingrassia, Maurizio Memo, Barbara Garavaglia
Mutations in WDR45 gene, coding for a beta-propeller protein, have been found in patients affected by Neurodegeneration with Brain Iron Accumulation, NBIA5 (also known as BPAN). BPAN is a movement disorder with Non Transferrin Bound Iron (NTBI) accumulation in the basal ganglia as common hallmark between NBIA classes (Hayflick et al., 2013). WDR45 has been predicted to have a role in autophagy, while the impairment of iron metabolism in the different NBIA subclasses has not currently been clarified. We found the up-regulation of the ferrous iron transporter (-)IRE/Divalent Metal Transporter1 and down-regulation of Transferrin receptor in the fibroblasts of two BPAN affected patients with splicing mutations 235+1G>A (BPAN1) and 517_519ΔVal 173 (BPAN2)...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/28157471/angiopoietins-as-biomarkers-of-disease-severity-and-bacterial-burden-in-pulmonary-tuberculosis
#19
N P Kumar, B Velayutham, D Nair, S Babu
BACKGROUND: Circulating angiogenic factors of the vascular endothelial growth factor family are important biomarkers of disease severity in pulmonary tuberculosis (PTB). However, the role of angiopoietins, which are also involved in angiogenesis, in PTB is not known. OBJECTIVE AND DESIGN: To examine the association of circulating angiopoietins with TB disease or latent tuberculous infection (LTBI), we examined the systemic levels of angiopoietin (Ang) 1, Ang 2 and Tie-2 receptor in individuals with PTB (n = 44), LTBI (n = 44) or no tuberculous infection (NTBI) (n = 44)...
January 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/27917462/iron-overload-across-the-spectrum-of-non-transfusion-dependent-thalassaemias-role-of-erythropoiesis-splenectomy-and-transfusions
#20
RANDOMIZED CONTROLLED TRIAL
John B Porter, Maria Domenica Cappellini, Antonis Kattamis, Vip Viprakasit, Khaled M Musallam, Zewen Zhu, Ali T Taher
Non-transfusion-dependent thalassaemias (NTDT) encompass a spectrum of anaemias rarely requiring blood transfusions. Increased iron absorption, driven by hepcidin suppression secondary to erythron expansion, initially causes intrahepatic iron overload. We examined iron metabolism biomarkers in 166 NTDT patients with β thalassaemia intermedia (n = 95), haemoglobin (Hb) E/β thalassaemia (n = 49) and Hb H syndromes (n = 22). Liver iron concentration (LIC), serum ferritin (SF), transferrin saturation (TfSat) and non-transferrin-bound iron (NTBI) were elevated and correlated across diagnostic subgroups...
January 2017: British Journal of Haematology
keyword
keyword
74134
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"