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https://www.readbyqxmd.com/read/28099381/daily-propranolol-administration-reduces-persistent-injury-associated-anemia-following-severe-trauma-and-chronic-stress
#1
Ines G Alamo, Kolenkode B Kannan, Letitia E Bible, Tyler J Loftus, Harry Ramos, Philip A Efron, Alicia M Mohr
BACKGROUND: Following severe trauma, patients develop a norepinephrine-mediated persistent, injury-associated anemia. This anemia is associated with suppression of bone marrow erythroid colony growth, along with decreased iron levels, and elevated erythropoietin (EPO) levels, which are insufficient to promote effective erythropoiesis. The impact of norepinephrine on iron regulators such as ferroportin, transferrin and transferrin receptor-1 (TFR-1) are unknown. Using a clinically relevant rodent model of lung contusion (LC), hemorrhagic shock (HS), and chronic stress (CS), we hypothesize that daily propranolol (BB), a non-selective beta-blocker, restores bone marrow function and improves iron homeostasis...
January 17, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28096133/regulation-of-the-iron-homeostatic-hormone-hepcidin
#2
REVIEW
Veena Sangkhae, Elizabeta Nemeth
Iron is required for many biological processes but is also toxic in excess; thus, body iron balance is maintained through sophisticated regulatory mechanisms. The lack of a regulated iron excretory mechanism means that body iron balance is controlled at the level of absorption from the diet. Iron absorption is regulated by the hepatic peptide hormone hepcidin. Hepcidin also controls iron release from cells that recycle or store iron, thus regulating plasma iron concentrations. Hepcidin exerts its effects through its receptor, the cellular iron exporter ferroportin...
January 2017: Advances in Nutrition
https://www.readbyqxmd.com/read/28087888/simulated-microgravity-decreases-circulating-iron-in-rats-role-of-inflammation-induced-hepcidin-upregulation
#3
Thibault Cavey, Nicolas Pierre, Kévin Nay, Coralie Allain, Martine Ropert, Olivier Loréal, Frédéric Derbré
During spaceflight, humans exposed to microgravity exhibit an increase of iron storage and a reduction of circulating iron. Such perturbations could promote oxidative stress and anemia in astronauts. The mechanism by which microgravity modulates iron metabolism is still unknown. Herein, we hypothesized that microgravity up-regulates hepcidin, a hormone produced by the liver that is the main controller of iron homeostasis. To test this hypothesis, rats were submitted to hindlimb unloading (HU), the reference model to mimic the effects of microgravity in rodents...
January 13, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28075024/uncovering-iron-regulation-with-species-specific-transcriptome-patterns-in-atlantic-and-coho-salmon-during-a-caligus-rogercresseyi-infestation
#4
V Valenzuela-Muñoz, S Boltaña, C Gallardo-Escárate
Salmon species cultured in Chile evidence different levels of susceptibility to the sea louse Caligus rogercresseyi. These differences have mainly been associated with specific immune responses. Moreover, iron regulation seems to be an important mechanism to confer immunity during the host infestation. This response called nutritional immunity has been described in bacterial infections, despite that no comprehensive studies involving in marine ectoparasites infestation have been reported. With this aim, we analysed the transcriptome profiles of Atlantic and coho salmon infected with C...
January 11, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/28073521/current-status-of-iron-metabolism-clinical-and-therapeutic-implications
#5
REVIEW
Susana Conde Diez, Ricardo de Las Cuevas Allende, Eulogio Conde García
Hepcidin is the main regulator of iron metabolism and a pathogenic factor in iron disorders. Hepcidin deficiency causes iron overload, whereas hepcidin excess causes or contributes to the development of iron-restricted anaemia in chronic inflammatory diseases. We know the mechanisms involved in the synthesis of hepcidin and, under physiological conditions, there is a balance between activating signals and inhibitory signals that regulate its synthesis. The former include those related to plasmatic iron level and also those related to chronic inflammatory diseases...
January 7, 2017: Medicina Clínica
https://www.readbyqxmd.com/read/28068331/modelling-systemic-iron-regulation-during-dietary-iron-overload-and-acute-inflammation-role-of-hepcidin-independent-mechanisms
#6
Mihaela Enculescu, Christoph Metzendorf, Richard Sparla, Maximilian Hahnel, Johannes Bode, Martina U Muckenthaler, Stefan Legewie
Systemic iron levels must be maintained in physiological concentrations to prevent diseases associated with iron deficiency or iron overload. A key role in this process plays ferroportin, the only known mammalian transmembrane iron exporter, which releases iron from duodenal enterocytes, hepatocytes, or iron-recycling macrophages into the blood stream. Ferroportin expression is tighly controlled by transcriptional and post-transcriptional mechanisms in response to hypoxia, iron deficiency, heme iron and inflammatory cues by cell-autonomous and systemic mechanisms...
January 9, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28067386/iron-and-inflammation-the-gut-reaction
#7
REVIEW
Smriti Verma, Bobby J Cherayil
Anemia is a frequent complication of many inflammatory disorders, including inflammatory bowel disease. Although the pathogenesis of this problem is multifactorial, a key component is the abnormal elevation of the hormone hepcidin, the central regulator of systemic iron homeostasis. Investigations over the last decade have resulted in important insights into the role of hepcidin in iron metabolism and the mechanisms that lead to hepcidin dysregulation in the context of inflammation. These insights provide the foundation for novel strategies to prevent and treat the anemia associated with inflammatory diseases...
January 9, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28063950/dietary-alpha-linolenic-acid-linoleic-acid-ratios-modulate-immune-response-physical-barrier-and-related-signaling-molecules-mrna-expression-in-the-gills-of-juvenile-grass-carp-ctenopharyngodon-idella
#8
Yun-Yun Zeng, Lin Feng, Wei-Dan Jiang, Yang Liu, Pei Wu, Jun Jiang, Sheng-Yao Kuang, Ling Tang, Wu-Neng Tang, Yong-An Zhang, Xiao-Qiu Zhou
This study was conducted to explore the possible effects of dietary ALA/LNA ratios on the gill immunity, tight junction and antioxidant capacity, and the related signaling factor mRNA levels of juvenile grass carp (Ctenopharyngodon idella). Fish were fed diets with different ALA/LNA ratios (0.01, 0.34, 0.68, 1.03, 1.41, 1.76 and 2.15) for 60 days. The present results showed that ALA/LNA ratio of 1.03 significantly enhanced lysozyme and acid phosphatase activities, complement 3 contents, promoted mRNA levels of antimicrobial peptides (Hepcidin and liver expression antimicrobial peptide-2), anti-inflammatory cytokines (interleukin 10 and transforming growth factor β1) and inhibitor protein κBα, whereas suppressed pro-inflammatory cytokines (interleukin 1β, interleukin 8, tumor necrosis factor a and interferon γ2), and signal molecules (IκB kinase β, IκB kines γ and nuclear factor κB p65) mRNA levels in the gill, indicating that optimal dietary ALA/LNA ratio improve gill immunity of juvenile fish...
January 4, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28057442/iron-importers-zip8-and-zip14-are-expressed-in-retina-and-regulated-by-retinal-iron-levels
#9
Jacob Sterling, Samyuktha Guttha, Ying Song, Delu Song, Majda Hadziahmetovic, Joshua L Dunaief
Intracellular retinal iron accumulation has been implicated in the pathogenesis of age-related macular degeneration (AMD), the leading cause of irreversible blindness among individuals over the age of 50. Ceruloplasmin/hephaestin double knockout mice (Cp/Heph DKO) and hepcidin knockout mice (Hepc KO) accumulate retinal iron and model some features of AMD. Two canonical pathways govern cellular iron import - transferrin-bound iron import and non-transferrin bound iron import. In Cp/Heph DKO and Hepc KO iron-loaded retinas, transferrin-bound iron import is downregulated...
January 2, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28054602/identification-of-guanosine-5-diphosphate-as-potential-iron-mobilizer-preventing-the-hepcidin-ferroportin-interaction-and-modulating-the-interleukin-6-stat-3-pathway
#10
Stanzin Angmo, Neha Tripathi, Sheenu Abbat, Shailesh Sharma, Shelley Sardul Singh, Avishek Halder, Kamalendra Yadav, Geeta Shukla, Rajat Sandhir, Vikas Rishi, Prasad V Bharatam, Hariom Yadav, Nitin Kumar Singhal
Hepcidin, a peptide hormone, is a key regulator in mammalian iron homeostasis. Increased level of hepcidin due to inflammatory conditions stimulates the ferroportin (FPN) transporter internalization, impairing the iron absorption; clinically manifested as anemia of inflammation (AI). Inhibiting hepcidin-mediated FPN degradation is proposed as an important strategy to combat AI. A systematic approach involving in silico, in vitro, ex vivo and in vivo studies is employed to identify hepcidin-binding agents. The virtual screening of 68,752 natural compounds via molecular docking resulted into identification of guanosine 5'-diphosphate (GDP) as a promising hepcidin-binding agent...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28051796/%C3%A2-differences-in-hepatic-expression-of-iron-inflammation-and-stress-related-genes-in-patients-with-nonalcoholic-steatohepatitis
#11
Priya Handa, Akhila L Vemulakonda, Bryan D Maliken, Vicki Morgan-Stevenson, James E Nelson, Barjinder K Dhillon, Kelly A Hennessey, Rohit Gupta, Matthew M Yeh, Kris V Kowdley
 Nonalcoholic fatty liver disease (NAFLD) is the most common cause of chronic liver disease worldwide. We have previously shown that hepatic reticuloendothelial system (RES) iron deposition is associated with an advanced degree of nonalcoholic steatohepatitis (NASH) in humans. In this study, we aimed to determine differentially expressed genes related to iron overload, inflammation and oxidative stress pathways, with the goal of identifying factors associated with NASH progression. Seventy five patients with NAFLD were evaluated for their biochemical parameters and their liver tissue analyzed for NASH histological characteristics...
January 2017: Annals of Hepatology
https://www.readbyqxmd.com/read/28029503/iron-deficiency-and-iron-deficiency-anaemia-in-women
#12
REVIEW
Laura Percy, Diana Mansour, Ian Fraser
Iron deficiency (ID) is the most common micronutrient deficiency worldwide with >20% of women experiencing it during their reproductive lives. Hepcidin, a peptide hormone mostly produced by the liver, controls the absorption and regulation of iron. Understanding iron metabolism is pivotal in the successful management of ID and iron deficiency anaemia (IDA) using oral preparations, parenteral iron or blood transfusion. Oral preparations vary in their iron content and can result in gastrointestinal side effects...
October 1, 2016: Best Practice & Research. Clinical Obstetrics & Gynaecology
https://www.readbyqxmd.com/read/28028679/hfe-variants-and-the-expression-of-iron-related-proteins-in-breast-cancer-associated-lymphocytes-and-macrophages
#13
Oriana Marques, Ana Rosa, Luciana Leite, Paula Faustino, Alexandra Rêma, Berta Martins da Silva, Graça Porto, Carlos Lopes
The association of HFE (High Iron FE) major variants with breast cancer risk and behavior has been a matter of discussion for a long time. However, their impact on the expression of iron-related proteins in the breast cancer tissue has never been addressed. In the present study, hepcidin, ferroportin 1, transferrin receptor 1 (TfR1), and ferritin expressions, as well as tissue iron deposition were evaluated in a collection of samples from breast cancers patients and analyzed according to the patients' HFE genotype...
December 27, 2016: Cancer Microenvironment: Official Journal of the International Cancer Microenvironment Society
https://www.readbyqxmd.com/read/28027576/human-macrophage-ferroportin-biology-and-the-basis-for-the-ferroportin-disease
#14
Manuela Sabelli, Giuliana Montosi, Cinzia Garuti, Angela Caleffi, Stefania Oliveto, Stefano Biffo, Antonello Pietrangelo
: Ferroportin (FPN1) is the sole iron-exporter in mammals but its cell-specific function and regulation are still elusive. This study aims at studying FPN1 expression in human macrophages, the cells that mostly contribute on a daily basis to plasma iron turnover and are central in the pathogenesis of the disease due to lack-of-function FPN1 mutations, the Ferroportin Disease (FD). We characterized FPN1 protein expression and traffic by confocal microscopy, western blot, gel-filtration and immunoprecipitation studies in macrophages from blood donors and patients with either FPN1 p...
December 27, 2016: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28013381/pilot-study-of-the-effect-of-cholecalciferol-supplementation-on-hepcidin-in-children-with-chronic-kidney-disease-results-of-the-d-fense-trial
#15
Meredith A Atkinson, Stephen P Juraschek, Michael S Bertenthal, Barbara Detrick, Susan L Furth, Edgar R Miller
BACKGROUND: Hepcidin is a key mediator of the anemia of chronic kidney disease (CKD). There is emerging evidence that 25-hydroxyvitamin D (25D) regulates hepcidin production. METHODS: A randomized controlled trial of daily vitamin D supplementation for 12 weeks was performed with the aim to test the effects of 4000 versus 400 IU of cholecalciferol on serum hepcidin levels in children with non-dialysis CKD recruited at a tertiary care children's hospital. Hepcidin was quantified using a validated competitive enzyme-linked immunosorbent assay...
December 24, 2016: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28004654/hepcidin-inhibits-smad3-phosphorylation-in-hepatic-stellate-cells-by-impeding-ferroportin-mediated-regulation-of-akt
#16
Chang Yeob Han, Ja Hyun Koo, Sung Hoon Kim, Sara Gardenghi, Stefano Rivella, Pavel Strnad, Se Jin Hwang, Sang Geon Kim
Hepatic stellate cell (HSC) activation on liver injury facilitates fibrosis. Hepatokines affecting HSCs are largely unknown. Here we show that hepcidin inhibits HSC activation and ameliorates liver fibrosis. We observe that hepcidin levels are inversely correlated with exacerbation of fibrosis in patients, and also confirm the relationship in animal models. Adenoviral delivery of hepcidin to mice attenuates liver fibrosis induced by CCl4 treatment or bile duct ligation. In cell-based assays, either hepcidin from hepatocytes or exogenous hepcidin suppresses HSC activation by inhibiting TGFβ1-mediated Smad3 phosphorylation via Akt...
December 22, 2016: Nature Communications
https://www.readbyqxmd.com/read/27999284/aspirin-down-regulates-hepcidin-by-inhibiting-nf-%C3%AE%C2%BAb-and-il6-jak2-stat3-pathways-in-bv-2-microglial-cells-treated-with-lipopolysaccharide
#17
Wan-Ying Li, Fei-Mi Li, Yu-Fu Zhou, Zhong-Min Wen, Juan Ma, Ke Ya, Zhong-Ming Qian
Aspirin down regulates transferrin receptor 1 (TfR1) and up regulates ferroportin 1 (Fpn1) and ferritin expression in BV-2 microglial cells treated without lipopolysaccharides (LPS), as well as down regulates hepcidin and interleukin 6 (IL-6) in cells treated with LPS. However, the relevant mechanisms are unknown. Here, we investigate the effects of aspirin on expression of hepcidin and iron regulatory protein 1 (IRP1), phosphorylation of Janus kinase 2 (JAK2), signal transducer and activator of transcription 3 (STAT3) and P65 (nuclear factor-κB), and the production of nitric oxide (NO) in BV-2 microglial cells treated with and without LPS...
December 16, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27995414/na-h-exchanger-3-inhibitor-diminishes-hepcidin-enhanced-duodenal-calcium-transport-in-hemizygous-%C3%AE-globin-knockout-thalassemic-mice
#18
Narattaphol Charoenphandhu, Kamonshanok Kraidith, Kornkamon Lertsuwan, Chanakarn Sripong, Panan Suntornsaratoon, Saovaros Svasti, Nateetip Krishnamra, Kannikar Wongdee
Recent investigation has shown that the liver-derived iron-regulating hormone, hepcidin, can potentiate intestinal calcium absorption in hemizygous β-globin knockout thalassemic (BKO) mice. Since the upregulation of Fe(2+) and H(+) cotransporter, divalent metal transporter (DMT)-1, has been shown to correlate with thalassemia-induced intestinal calcium absorption impairment, the inhibition of the apical Na(+)/H(+) exchanger (NHE)-3 that is essential for cytoplasmic pH regulation and transepithelial sodium absorption was hypothesized to negatively affect hepcidin action...
December 19, 2016: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/27980120/production-and-characterization-of-functional-recombinant-hybrid-heteropolymers-of-camel-hepcidin-and-human-ferritin-h-and-l-chains
#19
Mohamed Boumaiza, Fernando Carmona, Maura Poli, Michela Asperti, Alessandra Gianoncelli, Michela Bertuzzi, Paola Ruzzenenti, Paolo Arosio, Mohamed Nejib Marzouki
Hepcidin is a liver-synthesized hormone that plays a central role in the regulation of systemic iron homeostasis. To produce a new tool for its functional properties the cDNA coding for camel hepcidin-25 was cloned at the 5'end of human FTH sequence into the pASK-IBA43plus vector for expression in Escherichiacoli The recombinant fusion hepcidin-ferritin-H subunit was isolated as an insoluble iron-containing protein. When alone it did not refold in a 24-mer ferritin molecule, but it did when renatured together with H- or L-ferritin chains...
December 15, 2016: Protein Engineering, Design & Selection: PEDS
https://www.readbyqxmd.com/read/27956775/relationship-between-hepcidin-and-oxidant-antioxidant-status-in-calves-with-suspected-neonatal-septicemia
#20
E E Erkilic, H M Erdogan, M Ogun, A H Kirmizigul, E Gokce, M Kuru, A Kukurt
AIM: This study has been conducted for the purpose of determining serum hepcidin, total antioxidant status (TAS), total oxidant status (TOS), and Fe levels in calves with suspected neonatal septicemia before and after treatment and the clinical significance of hepcidin in calves with suspected neonatal septicemia. MATERIALS AND METHODS: The study material consisted of 15 calves of different ages and sexes brought to the Training, Research and Application Center at the Kafkas University Faculty of Veterinary Medicine with suspected neonatal septicemia...
November 2016: Veterinary World
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