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https://www.readbyqxmd.com/read/27896900/molecular-features-of-copper-binding-proteins-involved-in-copper-homeostasis
#1
REVIEW
Giuseppe Inesi
Copper has a wide and important role in biological systems, determining conformation and activity of many metalloproteins and enzymes, such as cytochrome oxidase and superoxide dismutase . Furthermore, due to its possible reactivity with nonspecific proteins and toxic effects, elaborate systems of absorption, concentration buffering, delivery to specific protein sites and elimination, require a complex system including small carriers, chaperones and active transporters. The P-type copper ATPases ATP7A and ATP7B provide an important system for acquisition, active transport, distribution and elimination of copper...
November 28, 2016: IUBMB Life
https://www.readbyqxmd.com/read/27881675/the-intestinal-copper-exporter-cua-1-is-required-for-systemic-copper-homeostasis-in-caenorhabditis-elegans
#2
Haarin Chun, Anuj Kumar Sharma, Jaekwon Lee, Jefferson Chan, Shang Jia, Byung-Eun Kim
Copper (Cu) plays key catalytic and regulatory roles in biochemical processes essential for normal growth, development, and health. Defects in Cu metabolism cause Menkes and Wilson's disease, myeloneuropathy, and cardiovascular disease and are associated with other pathophysiological states. Consequently, it is critical to understand the mechanisms by which organisms control the acquisition, distribution, and utilization of Cu. The intestinal enterocyte is a key regulatory point for Cu absorption into the body, however the mechanisms by which intestinal cells transport Cu to maintain organismal Cu homeostasis are poorly understood...
November 23, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27878136/phenotypic-convergence-of-menkes-and-wilson-disease
#3
Boglarka Bansagi, David Lewis-Smith, Endre Pal, Jennifer Duff, Helen Griffin, Angela Pyle, Juliane S Müller, Gabor Rudas, Zsuzsanna Aranyi, Hanns Lochmüller, Patrick F Chinnery, Rita Horvath
Menkes disease is an X-linked multisystem disorder with epilepsy, kinky hair, and neurodegeneration caused by mutations in the copper transporter ATP7A. Other ATP7A mutations have been linked to juvenile occipital horn syndrome and adult-onset hereditary motor neuropathy.(1,2) About 5%-10% of the patients present with "atypical Menkes disease" characterized by longer survival, cerebellar ataxia, and developmental delay.(2) The intracellular copper transport is regulated by 2 P type ATPase copper transporters ATP7A and ATP7B...
December 2016: Neurology. Genetics
https://www.readbyqxmd.com/read/27877224/the-role-of-copper-transporter-atp7a-in-platinum-resistance-of-esophageal-squamous-cell-cancer-escc
#4
Zhuang-Hua Li, Rongjie Zheng, Jing-Tang Chen, Jun Jia, Miaozhen Qiu
Purpose: Platinum derivatives, such as cisplatin (DDP), carboplatin and oxaliplatin, are widely used components of modern cancer chemotherapy including esophageal squamous cell cancer (ESCC). However, their roles are limited by the impact of intrinsic/acquired resistance mechanisms on tumor responses. Recent studies have shown that the mammalian copper transporters CTR1, ATP7A and ATP7B are involved in cisplatin-resistance to some cancers. Methods: The cytotoxicities of DDP in different cell lines were determined using the MTT assay...
2016: Journal of Cancer
https://www.readbyqxmd.com/read/27806319/ammonium-tetrathiomolybdate-treatment-targets-the-copper-transporter-atp7a-and-enhances-sensitivity-of-breast-cancer-to-cisplatin
#5
Cristine L Chisholm, Haitao Wang, Ada Hang-Heng Wong, Guelaguetza Vazquez-Ortiz, Weiping Chen, Xiaoling Xu, Chu-Xia Deng
Cisplatin is an effective breast cancer drug but resistance often develops over prolonged chemotherapy. Therefore, we performed a candidate approach RNAi screen in combination with cisplatin treatment to identify molecular pathways conferring survival advantages. The screen identified ATP7A as a therapeutic target. ATP7A is a copper ATPase transporter responsible for intercellular movement and sequestering of cisplatin. Pharmaceutical replacement for ATP7A by ammonium tetrathiomolybdate (TM) enhanced cisplatin treatment in breast cancer cells...
October 31, 2016: Oncotarget
https://www.readbyqxmd.com/read/27714044/knockdown-of-copper-transporting-atpase-1-atp7a-impairs-iron-flux-in-fully-differentiated-rat-iec-6-and-human-caco-2-intestinal-epithelial-cells
#6
Jung-Heun Ha, Caglar Doguer, James F Collins
Intestinal iron absorption is highly regulated since no mechanism for iron excretion exists. We previously demonstrated that expression of an intestinal copper transporter (Atp7a) increases in parallel with genes encoding iron transporters in the rat duodenal epithelium during iron deprivation (Am. J. Physiol.: Gastrointest. Liver Physiol., 2005, 288, G964-G971). This led us to postulate that Atp7a may influence intestinal iron flux. Therefore, to test the hypothesis that Atp7a is required for optimal iron transport, we silenced Atp7a in rat IEC-6 and human Caco-2 cells...
September 1, 2016: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/27690074/effects-of-octylphenol-and-bisphenol-a-on-the-metal-cation-transporter-channels-of-mouse-placentas
#7
Jae-Hwan Lee, Changhwan Ahn, Hee Young Kang, Eui-Ju Hong, Sang-Hwan Hyun, Kyung-Chul Choi, Eui-Bae Jeung
Octylphenol (OP) and bisphenol A (BPA) are known as endocrine-disrupting chemicals (EDCs). During pregnancy, the expression of steroid hormone receptors is controlled by maternal and fetal nutrition. To evaluate the impact of EDCs during pregnancy, ethinyl estradiol (EE, 0.2 mg/kg/day), OP (50 mg/kg/day), and BPA (50 mg/kg/day) were administered to pregnant mice. The mRNA levels of TRPV6 (transient receptor potential cation channels in subfamily V, member 6) decreased significantly by EE and OP. The PMCA1 (ATPase, Ca(++) transporting, plasma membrane 1) mRNA and protein levels decreased significantly by EE, OP, and BPA...
2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/27631241/recurrent-spontaneous-subserosal-hematoma-of-ileum-causing-intestinal-obstruction-in-a-patient-with-menkes-disease-a-case-report
#8
Shu-Chao Weng, Chyong-Hsin Hsu, Nien-Lu Wang, Shuan-Pei Lin, Chuen-Bin Jiang
BACKGROUND: Menkes disease (MD) is a disorder of copper metabolism due to ATP7A gene mutation that leads to severe copper deficiency. Deformed blood vessels can be found in many parts of the body, and intracranial hematoma is generally reported. METHODS: We report a Taiwanese boy with MD who had recurrent spontaneous subserosal hematoma of ileum presenting as intestinal obstruction, with the 2 episodes 23 months apart. The patient returned to the usual physical status after surgical removal of the hematoma...
September 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27629586/diagnostic-copper-imaging-of-menkes-disease-by-synchrotron-radiation-generated-x-ray-fluorescence-analysis
#9
Miyuki Kinebuchi, Akihiro Matsuura, Tohru Kiyono, Yumiko Nomura, Sachiko Kimura
Copper (Cu) is an indispensable metal for normal development and function of humans, especially in central nervous system (CNS). However, its redox activity requires accurate Cu transport system. ATP7A, a main Cu(2+) transporting-ATPase, is necessary to efflux Cu across the plasma membrane and synthesize cuproenzymes. Menkes disease (MD) is caused by mutations in ATP7A gene. Clinically, MD is Cu deficiency syndrome and is treated with Cu-histidine injections soon after definite diagnosis. But outcome of the most remains poor...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27587995/metal-dependent-regulation-of-atp7a-and-atp7b-in-fibroblast-cultures
#10
Malgorzata Lenartowicz, Torben Moos, Mateusz Ogórek, Thomas G Jensen, Lisbeth B Møller
Deficiency of one of the copper transporters ATP7A and ATP7B leads to the rare X-linked disorder Menkes Disease (MD) or the rare autosomal disorder Wilson disease (WD), respectively. In order to investigate whether the ATP7A and the ATP7B genes may be transcriptionally regulated, we measured the expression level of the two genes at various concentrations of iron, copper, and insulin. Treating fibroblasts from controls or from individuals with MD or WD for 3 and 10 days with iron chelators revealed that iron deficiency led to increased transcript levels of both ATP7A and ATP7B...
2016: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/27516958/transcriptome-analysis-of-copper-homeostasis-genes-reveals-coordinated-upregulation-of-slc31a1-sco1-and-cox11-in-colorectal-cancer
#11
Vincenza Barresi, Angela Trovato-Salinaro, Giorgia Spampinato, Nicolò Musso, Sergio Castorina, Enrico Rizzarelli, Daniele Filippo Condorelli
Copper homeostasis and distribution is strictly regulated by a network of transporters and intracellular chaperones encoded by a group of genes collectively known as copper homeostasis genes (CHGs). In this work, analysis of The Cancer Genome Atlas database for somatic point mutations in colorectal cancer revealed that inactivating mutations are absent or extremely rare in CHGs. Using oligonucleotide microarrays, we found a strong increase in mRNA levels of the membrane copper transporter 1 protein [CTR1; encoded by the solute carrier family 31 member 1 gene (SLC31A1 gene)] in our series of colorectal carcinoma samples...
August 2016: FEBS Open Bio
https://www.readbyqxmd.com/read/27509383/effects-of-waterborne-cu-exposure-on-intestinal-copper-transport-and-lipid-metabolism-of-synechogobius-hasta
#12
Feng Chen, Zhi Luo, Guang-Hui Chen, Xi Shi, Xu Liu, Yu-Feng Song, Ya-Xiong Pan
The present study was conducted to explore the effects of waterborne Cu exposure on intestinal Cu transport and lipid metabolism of Synechogobius hasta. S. hasta were exposed to 0, 0.4721 and 0.9442μM Cu, respectively. Sampling occurred on days 0, 21 and 42, respectively. Growth performance, intestinal lipid deposition, Cu content, and activities and mRNA expression of enzymes and genes involved in Cu transport and lipid metabolism were analyzed. Cu exposure decreased WG and SGR on days 21 and 42. Cu exposure increased intestinal Cu and lipid contents...
September 2016: Aquatic Toxicology
https://www.readbyqxmd.com/read/27498968/molecular-phylogenetic-analysis-of-nuclear-genes-suggests-a-cenozoic-over-water-dispersal-origin-for-the-cuban-solenodon
#13
Jun J Sato, Satoshi D Ohdachi, Lazaro M Echenique-Diaz, Rafael Borroto-Páez, Gerardo Begué-Quiala, Jorge L Delgado-Labañino, Jorgelino Gámez-Díez, José Alvarez-Lemus, Son Truong Nguyen, Nobuyuki Yamaguchi, Masaki Kita
The Cuban solenodon (Solenodon cubanus) is one of the most enigmatic mammals and is an extremely rare species with a distribution limited to a small part of the island of Cuba. Despite its rarity, in 2012 seven individuals of S. cubanus were captured and sampled successfully for DNA analysis, providing new insights into the evolutionary origin of this species and into the origins of the Caribbean fauna, which remain controversial. We conducted molecular phylogenetic analyses of five nuclear genes (Apob, Atp7a, Bdnf, Brca1 and Rag1; total, 4,602 bp) from 35 species of the mammalian order Eulipotyphla...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27455805/-copper-metabolism-and-genetic-disorders
#14
Norikazu Shimizu
Copper is one of essential trace elements. Copper deficiency lead to growth and developmental failure and/or neurological dysfunction. However, excess copper is also problems for human life. There are two disorders of inborn error of copper metabolism, Menkes disease and Wilson disease. Menkes disease is an X linked recessive disorder with copper deficiency and Wilson disease is an autosomal recessive disorder with copper accumulation. These both disorders result from the defective functioning of copper transport P-type ATPase, ATP7A of Menkes disease and ATP7B of Wilson disease...
July 2016: Nihon Rinsho. Japanese Journal of Clinical Medicine
https://www.readbyqxmd.com/read/27426256/copper-zinc-and-calcium-imaging-and-quantification-in-anterior-pituitary-secretory-granules
#15
Mathilde L Bonnemaison, Megan E Duffy, Richard E Mains, Stefan Vogt, Betty A Eipper, Martina Ralle
The anterior pituitary is specialized for the synthesis, storage and release of peptide hormones. The activation of inactive peptide hormone precursors requires a specific set of proteases and other post-translational processing enzymes. High levels of peptidylglycine α-amidating monooxygenase (PAM), an essential peptide processing enzyme, occur in the anterior pituitary. PAM, which converts glycine-extended peptides into amidated products, requires copper and zinc to support its two catalytic activities and calcium for structure...
September 1, 2016: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/27379771/evidence-for-a-role-for-the-putative-drosophila-hgrx1-orthologue-in-copper-homeostasis
#16
Stephen W Mercer, Richard Burke
Glutaredoxins are a family of small molecular weight proteins that have a central role in cellular redox regulation. Human GRX1 (hGRX1) has also been shown to play an integral role in copper homeostasis by regulating the redox activity of the metalated sites of copper chaperones such as ATOX1 and SOD1, and the copper efflux proteins ATP7A and ATP7B. To further elucidate the role of hGRX1 in copper homeostasis, we examined the impact of RNA interference-mediated knockdown of CG6852, a putative Drosophila orthologue of hGRX1...
August 2016: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/27337370/multiple-di-leucines-in-the-atp7a-copper-transporter-are-required-for-retrograde-trafficking-to-the-trans-golgi-network
#17
Sha Zhu, Vinit Shanbhag, Victoria L Hodgkinson, Michael J Petris
The ATP7A protein is a ubiquitous copper-transporting P-type ATPase that is mutated in the lethal pediatric disorder of copper metabolism, Menkes disease. The steady-state location of ATP7A is within the trans-Golgi network (TGN), where it delivers copper to copper-dependent enzymes within the secretory pathway. However, ATP7A constantly cycles between the TGN and the plasma membrane, and in the presence of high copper concentrations, the exocytic arm of this cycling pathway is enhanced to promote a steady-state distribution of ATP7A to post-Golgi vesicles and the plasma membrane...
September 1, 2016: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/27331785/loss-of-divalent-metal-transporter-1-function-promotes-brain-copper-accumulation-and-increases-impulsivity
#18
Murui Han, JuOae Chang, Jonghan Kim
The divalent metal transporter 1 (DMT1) is a major iron transporter required for iron absorption and erythropoiesis. Loss of DMT1 function results in microcytic anemia. While iron plays an important role in neural function, the behavioral consequences of DMT1 deficiency are largely unexplored. The goal of this study was to define the neurobehavioral and neurochemical phenotypes of homozygous Belgrade (b/b) rats that carry DMT1 mutation and explore potential mechanisms of these phenotypes. The b/b rats (11-12 weeks old) and their healthy littermate heterozygous (+/b) Belgrade rats were subject to elevated plus maze tasks...
September 2016: Journal of Neurochemistry
https://www.readbyqxmd.com/read/27293072/characterizing-the-molecular-phenotype-of-an-atp7a-t985i-conditional-knock-in-mouse-model-for-x-linked-distal-hereditary-motor-neuropathy-dhmnx
#19
Gonzalo Perez-Siles, Adrienne Grant, Melina Ellis, Carolyn Ly, Aditi Kidambi, Mamdouh Khalil, Roxana M Llanos, Sharon La Fontaine, Alleene V Strickland, Stephan Züchner, Sandra Bermeo, Elysia Neist, Tara C Brennan-Speranza, Reinaldo I Takata, Carlos E Speck-Martins, Julian F B Mercer, Garth A Nicholson, Marina L Kennerson
ATP7A is a P-type ATPase essential for cellular copper (Cu) transport and homeostasis. Loss-of-function ATP7A mutations causing systemic Cu deficiency are associated with severe Menkes disease or its milder allelic variant, occipital horn syndrome. We previously identified two rare ATP7A missense mutations (P1386S and T994I) leading to a non-fatal form of motor neuron disorder, X-linked distal hereditary motor neuropathy (dHMNX), without overt signs of systemic Cu deficiency. Recent investigations using a tissue specific Atp7a knock out model have demonstrated that Cu plays an essential role in motor neuron maintenance and function, however the underlying pathogenic mechanisms of ATP7A mutations causing axonal degeneration remain unknown...
September 1, 2016: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/27242196/ph-regulated-metal-ligand-switching-in-the-hm-loop-of-atp7a-a-new-paradigm-for-metal-transfer-chemistry
#20
Chelsey D Kline, Benjamin F Gambill, Mary Mayfield, Svetlana Lutsenko, Ninian J Blackburn
Cuproproteins such as PHM and DBM mature in late endosomal vesicles of the mammalian secretory pathway where changes in vesicle pH are employed for sorting and post-translational processing. Colocation with the P1B-type ATPase ATP7A suggests that the latter is the source of copper and supports a mechanism where selectivity in metal transfer is achieved by spatial colocation of partner proteins in their specific organelles or vesicles. In previous work we have suggested that a lumenal loop sequence located between trans-membrane helices TM1 and TM2 of the ATPase, and containing five histidines and four methionines, acts as an organelle-specific chaperone for metallation of the cuproproteins...
August 1, 2016: Metallomics: Integrated Biometal Science
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