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Iron metabolism

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https://www.readbyqxmd.com/read/28338217/fasting-up-regulates-ferroportin-1-expression-via-a-ghrelin-ghsr-mapk-signaling-pathway
#1
Qian-Qian Lou, Yu-Fu Zhou, Mesona Yung-Jin Chen, Li Liu, Juan Ma, Meng-Wan Zhang, Fa-Li Zhang, Ya Ke, Zhong-Ming Qian
The significant positive correlation between ghrelin and iron and hepcidin levels in the plasma of children with iron deficiency anemia prompted us to hypothesize that ghrelin may affect iron metabolism. Here, we investigated the effects of fasting or ghrelin on the expression of hepcidin, ferroportin 1 (Fpn1), transferrin receptor 1 (TfR1), ferritin light chain (Ft-L) proteins and ghrelin, and also hormone secretagogue receptor 1 alpha (GHSR1α) and ghrelin O-acyltransferase (GOAT) mRNAs in the spleen and/or macrophage...
March 24, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28336188/identification-characterization-and-modulation-of-ferritin-h-in-the-sub-antarctic-notothenioid-eleginops-maclovinus-challenged-with-piscirickettsia-salmonis
#2
D Martínez, R Oyarzún, C Vargas-Lagos, J P Pontigo, M Soto-Dávila, J Saravia, A Romero, J J Núñez, A J Yáñez, L Vargas-Chacoff
Ferritin is a major iron storage protein essential not only in the infectious process, but also in any circumstance generating oxidative stress. In this study, the cDNA coding sequence of ferritin-H was obtained from the sub-Antarctic Notothenioid fish Eleginops maclovinus through transcriptomic analysis of the head kidney. This sequence contained a 534 bp open reading frame that coded for a 177 amino acid protein with a molecular weight of 20,786.2 Da and a theoretical pI of 5.56. The protein displayed a region of iron putative response elements in the 5'UTR, two putative ferritin iron-binding region signatures, and seven characteristic amino acids with ferroxidase functions...
March 21, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28334288/genome-sequencing-and-comparative-analysis-of-three-hypermucoviscous-klebsiella-pneumoniae-strains-isolated-in-russia
#3
Angelina A Kislichkina, Anastasia I Lev, Ekaterina V Komisarova, Nadezhda K Fursova, Vera P Myakinina, Tatiana N Mukhina, Alexander A Bogun, Nikolay V Volozhantsev
The prevalence and characteristics of hypermucoviscous (HV) strains among Klebsiella pneumoniae isolated in Russian hospitals were investigated. The HV strains were accounted for 11% K. pneumoniae isolates collected on the period from 2011 to 2016, and were characterized by belonging to K1, K2, K20 and K57 serotypes. Whole genome sequences (WGSs) of K. pneumoniae HV clinical strains KPi261 (SCPM-O-B-7850) and KPB4010 (SCPM-O-B-7846) belonging to K1 and K2 capsular types, as well as WGSs of K. pneumoniae strain KPM9 (SCPM-O-B-7749) of K20 capsular type isolated from freshwater were completed...
March 9, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28334149/higher-striatal-iron-concentration-is-linked-to-frontostriatal-underactivation-and-poorer-memory-in-normal-aging
#4
Grégoria Kalpouzos, Benjamín Garzón, Rouslan Sitnikov, Carmel Heiland, Alireza Salami, Jonas Persson, Lars Bäckman
In the brain, intracellular iron is essential for cellular metabolism. However, an overload of free iron is toxic, inducing oxidative stress and cell death. Although an increase of striatal iron has been related to atrophy and impaired cognitive performance, the link between elevated iron and altered brain activity in aging remains unexplored. In a sample of 37 younger and older adults, we examined whether higher striatal iron concentration could underlie age-related differences in frontostriatal activity induced by mental imagery of motor and non-motor scenes, and poorer recall of the scenes...
February 23, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28332570/iron-minerals-within-specific-microfossil-morphospecies-of-the-1-88%C3%A2-ga-gunflint-formation
#5
Kevin Lepot, Ahmed Addad, Andrew H Knoll, Jian Wang, David Troadec, Armand Béché, Emmanuelle J Javaux
Problematic microfossils dominate the palaeontological record between the Great Oxidation Event 2.4 billion years ago (Ga) and the last Palaeoproterozoic iron formations, deposited 500-600 million years later. These fossils are often associated with iron-rich sedimentary rocks, but their affinities, metabolism, and, hence, their contributions to Earth surface oxidation and Fe deposition remain unknown. Here we show that specific microfossil populations of the 1.88 Ga Gunflint Iron Formation contain Fe-silicate and Fe-carbonate nanocrystal concentrations in cell interiors...
March 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28332306/impact-of-iatrogenic-iron-overload-on-the-course-of-hepatitis-c-in-dialysis-population-a-plea-for-caution
#6
Guy Rostoker, Nosratola D Vaziri
About 2.5% of the world population, corresponding to about 177 million individuals, are infected by hepatitis C virus (HCV), a small, single-stranded RNA virus. The prevalence of HCV infection among dialysis patients in Japan, Europe, and North America during the 2012 to 2015 period was found to be 8.7% in the DOPPS study. Nosocomial HCV spread in hemodialysis facilities still occurs. Increased hepatic tissue iron has been shown to play a deleterious role in the course of hepatitis C, favor development of fibrosis and cirrhosis and possibly increase the risk of liver cancer in the general population...
March 23, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28331855/diabetes-in-hfe-hemochromatosis
#7
REVIEW
James C Barton, Ronald T Acton
Diabetes in whites of European descent with hemochromatosis was first attributed to pancreatic siderosis. Later observations revealed that the pathogenesis of diabetes in HFE hemochromatosis is multifactorial and its clinical manifestations are heterogeneous. Increased type 2 diabetes risk in HFE hemochromatosis is associated with one or more factors, including abnormal iron homeostasis and iron overload, decreased insulin secretion, cirrhosis, diabetes in first-degree relatives, increased body mass index, insulin resistance, and metabolic syndrome...
2017: Journal of Diabetes Research
https://www.readbyqxmd.com/read/28330947/linking-hemorrhage-angiogenesis-macrophages-and-iron-metabolism-in-atherosclerotic-vascular-diseases
#8
REVIEW
Liang Guo, Emanuel Harari, Renu Virmani, Aloke V Finn
No abstract text is available yet for this article.
April 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28329745/interleukin-6-and-hepcidin-levels-during-hormone-deplete-and-hormone-replete-phases-of-an-oral-contraceptive-cycle-a-pilot-study
#9
Marc Sim, Brian Dawson, Grant Landers, Dorine W Swinkels, Erwin Wiegerinck, Bu B Yeap, Debbie Trinder, Peter Peeling
BACKGROUND: In the past, elevated estradiol levels were reported to downregulate the iron regulatory hormone hepcidin, thereby potentially improving iron metabolism. As estrogen plays a role in regulating the menstrual cycle and can influence the cytokine interleukin-6 (IL-6; a hepcidin up-regulator), this investigation examined the effects of estradiol supplementation achieved by the use of a monophasic oral contraceptive pill (OCP) on IL-6, hepcidin levels and iron status during the hormone-deplete versus hormone-replete phases within an oral contraceptive cycle (OCC)...
March 23, 2017: Annals of Nutrition & Metabolism
https://www.readbyqxmd.com/read/28328181/role-of-hepcidin-ferroportin-axis-in-the-pathophysiology-diagnosis-and-treatment-in-anemia-of-chronic-inflammation
#10
Arielle L Langer, Yelena Z Ginzburg
Anemia of chronic inflammation (ACI) is a frequently diagnosed anemia and portends an independently increased morbidity and poor outcome associated with multiple underlying diseases. The pathophysiology of ACI is multifactorial, resulting from the effects of inflammatory cytokines which both directly and indirectly suppress erythropoiesis. Recent advances in molecular understanding of iron metabolism provide strong evidence that immune mediators, such as IL-6, lead to hepcidin-induced hypoferremia, iron sequestration, and decreased iron availability for erythropoiesis...
March 22, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28328083/oral-iron-supplementation-potential-implications-for-the-gut-microbiome-and-metabolome-in-patients-with-ckd
#11
Guus A M Kortman, Dorien Reijnders, Dorine W Swinkels
Patients with chronic kidney disease (CKD) and loss of kidney function are at increased risk for morbidity and mortality. The risks of CKD are attributed to "uremia," an increased concentration of uremic retention solutes (toxins) in the plasma. Recently, a colo-renal axis became clearly apparent and uremia has been associated with an altered gut microbiome composition and metabolism. There is a high prevalence of anemia in patients with CKD, for which patients are often treated with oral or intravenous iron...
March 22, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28326037/differences-on-brain-connectivity-in-adulthood-are-present-in-subjects-with-iron-deficiency-anemia-in-infancy
#12
Cecilia Algarin, Keerthana Deepti Karunakaran, Sussanne Reyes, Cristian Morales, Betsy Lozoff, Patricio Peirano, Bharat Biswal
Iron deficiency continues to be the most prevalent micronutrient deficit worldwide. Since iron is involved in several processes including myelination, dopamine neurotransmission and neuronal metabolism, the presence of iron deficiency anemia (IDA) in infancy relates to long-lasting neurofunctional effects. There is scarce data regarding whether these effects would extend to former iron deficient anemic human adults. Resting state functional magnetic resonance imaging (fMRI) is a novel technique to explore patterns of functional connectivity...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28321079/shewanella-algae-bacteremia-in-an-end-stage-renal-disease-patient-a-case-report-and-review-of-the-literature
#13
Tomoaki Takata, Hiroki Chikumi, Shota Morishita, Shintaro Hamada, Shotaro Hoi, Takuji Iyama, Takeaki Fukui, Tomomitsu Matono, Satoko Fukuda, Chishio Munemura, Hajime Isomoto
A 71-year-old man was admitted because of nausea and abdominal pain. He was receiving an erythropoiesis-stimulating agent for anemia and dysregulated iron metabolism due to stage G5 chronic kidney disease. He had a history of raw fish intake and was diagnosed with infectious enterocolitis, which worsened and led to septic shock. Shewanella putrefaciens grew in the blood culture, but Shewanella algae was identified in a 16S rRNA gene sequence analysis. We herein report a case of S. algae bacteremia believed to have been transmitted orally...
2017: Internal Medicine
https://www.readbyqxmd.com/read/28320861/recycling-of-iron-via-autophagy-is-critical-for-the-transition-from-glycolytic-to-respiratory-growth
#14
Tetsuro Horie, Tomoko Kawamata, Miou Matsunami, Yoshinori Ohsumi
Autophagy is a bulk degradation process conserved from yeast to mammals. To examine the roles of autophagy in cellular metabolism, we generated autophagy-defective (atg) mutants in the X2180-1B strain background. We compared the growth of wild type (WT) and atg cells in minimal (synthetic dextrose, SD) and rich (yeast extract-peptone-dextrose, YEPD) medium, and found that mutations in the core autophagy machinery results in defects in the diauxic shift, the transition from fermentation to respiratory growth upon glucose depletion, specifically in SD...
March 20, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28320837/the-suf-iron-sulfur-cluster-biosynthetic-system-is-essential-in-staphylococcus-aureus-and-decreased-suf-function-results-in-global-metabolic-defects-and-reduced-survival-in-human-neutrophils
#15
Christina A Roberts, Hassan M Al-Tameemi, Ameya A Mashruwala, Zuelay Rosario-Cruz, Unnati Chauhan, William E Sause, Victor J Torres, William J Belden, Jeffrey M Boyd
Staphylococcus aureus remains a causative agent for morbidity and mortality worldwide. This is, in part, a result of antimicrobial resistance highlighting the need to uncover novel antibiotic targets and discover new therapeutic agents. In the present study we explored the possibility that iron-sulfur (Fe-S) cluster synthesis is a viable antimicrobial target. RNA interference studies established that Suf (sulfur mobilization) dependent Fe-S cluster synthesis is essential in S. aureus We found that sufCDSUB were cotranscribed and suf transcription was positively influenced by sigma factor B...
March 20, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28320314/quorum-sensing-of-streptococcus-mutans-is-activated-by-aggregatibacter-actinomycetemcomitans-and-by-the-periodontal-microbiome
#16
Szymon P Szafrański, Zhi-Luo Deng, Jürgen Tomasch, Michael Jarek, Sabin Bhuju, Manfred Rohde, Helena Sztajer, Irene Wagner-Döbler
BACKGROUND: The oral cavity is inhabited by complex microbial communities forming biofilms that can cause caries and periodontitis. Cell-cell communication might play an important role in modulating the physiologies of individual species, but evidence so far is limited. RESULTS: Here we demonstrate that a pathogen of the oral cavity, Aggregatibacter actinomycetemcomitans (A. act.), triggers expression of the quorum sensing (QS) regulon of Streptococcus mutans, a well-studied model organism for cariogenic streptococci, in dual-species biofilms grown on artificial saliva...
March 20, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28319655/meeting-nutritional-needs-in-the-first-1000-days-a-place-for-small-quantity-lipid-based-nutrient-supplements
#17
Seth Adu-Afarwuah, Anna Lartey, Kathryn G Dewey
The first 1000 days of life is marked by intense metabolic activity and tissue deposition. The increased nutritional needs during this period, and the challenges to meeting them, are often not understood or appreciated. Here, we describe the nutritional needs during the first 1000 days, highlight the challenges to meeting these needs in developing countries, outline intervention strategies, and examine the consumption of small-quantity lipid-based nutrient supplements (SQ-LNS) as a promising strategy. In low-income settings, the challenge to meeting nutritional needs during the first 1000 days is worsened by overreliance on cereal-based diets of low nutrient density and high prevalence of infections and infestations...
March 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28319068/iron-addiction-a-novel-therapeutic-target-in-ovarian-cancer
#18
D Basuli, L Tesfay, Z Deng, B Paul, Y Yamamoto, G Ning, W Xian, F McKeon, M Lynch, C P Crum, P Hegde, M Brewer, X Wang, L D Miller, N Dyment, F M Torti, S V Torti
Ovarian cancer is a lethal malignancy that has not seen a major therapeutic advance in over 30 years. We demonstrate that ovarian cancer exhibits a targetable alteration in iron metabolism. Ferroportin (FPN), the iron efflux pump, is decreased, and transferrin receptor (TFR1), the iron importer, is increased in tumor tissue from patients with high grade but not low grade serous ovarian cancer. A similar profile of decreased FPN and increased TFR1 is observed in a genetic model of ovarian cancer tumor-initiating cells (TICs)...
March 20, 2017: Oncogene
https://www.readbyqxmd.com/read/28315884/complementary-feeding-micronutrients-and-developmental-outcomes-of-children
#19
Jacqueline F Gould
The period of complementary feeding (6-24 months of age) can be a challenging and vulnerable time for infant nutrition due to disproportionately high requirements for metabolic processes, rapid developmental processes, and limited gastric capacity. This is a period of crucial brain development where high caloric intake is necessary to allow synaptogenesis (creation of channels between neurons for communication), and maintenance of established synapses, myelination (laying the myelin sheath around neuronal axons) and everyday psychological functioning...
2017: Nestlé Nutrition Institute Workshop Series
https://www.readbyqxmd.com/read/28315482/modes-of-antibacterial-action-of-curcumin-under-dark-and-light-conditions-a-toxicoproteomics-approach
#20
Ilya Shlar, Samir Droby, Victor Rodov
Curcumin is a potent natural food-grade antimicrobial compound. Exposure to light further enhances its antimicrobial capacity. Proteomic methods were used in this study for investigating the mechanistic aspects of the antibacterial curcumin effects in the dark and upon illumination. Escherichia coli cells exposed to water-dispersible curcumin-methyl-β-cyclodextrin inclusion complex under dark and light conditions were compared with the non-treated cells kept under the same illumination regimes. Curcumin treatment in the dark evoked adaptive responses aimed at mitigation of oxidative stress, DNA protection, proteostasis, modulation of redox state via changing NADH level, and gasotransmitter (H2S and NH3) biosynthesis...
March 14, 2017: Journal of Proteomics
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