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Uptake transporters

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https://www.readbyqxmd.com/read/27915150/effect-of-environmental-salinity-manipulation-on-uptake-rates-and-distribution-patterns-of-waterborne-amino-acids-in-the-pacific-hagfish
#1
Chris N Glover, Tamzin A Blewett, Chris M Wood
Among vertebrates, hagfish are the only known iono- and osmoconformers, and the only species thus far documented to absorb amino acids directly across the skin. In the current study, short-term (6h) manipulations of exposure salinities (75-125% seawater) were conducted to determine whether changes in osmotic demands influenced the uptake and tissue distribution of waterborne amino acids (alanine, glycine and phenylalanine), in the Pacific hagfish, Eptatretus stoutii. No changes in erythrocyte or muscle amino acid accumulation rates were noted, but the patterns of plasma amino acid accumulation were suggestive of regulation...
November 30, 2016: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/27914043/a-revisit-to-quantitative-pet-with-18-f-fdopa-of-high-specific-activity-using-a-high-resolution-condition-in-view-of-application-to-regenerative-therapy
#2
Go Akamatsu, Akihito Ohnishi, Kazuki Aita, Hiroyuki Nishida, Yasuhiko Ikari, Masahiro Sasaki, Nobuo Kohara, Michio Senda
OBJECTIVE: With the advent of regenerative/cell therapy for Parkinson's disease (PD), (18)F-FDOPA has drawn new attention as a biomarker of the therapeutic that cannot be evaluated with radiopharmaceuticals for dopamine transporter. Since most previous (18)F-FDOPA PET studies were carried out many years ago with a PET scanner of lower resolution and with (18)F-FDOPA of low specific activity synthesized from (18)F-F2, we used a newer PET/CT scanner with a high-resolution condition and (18)F-FDOPA synthesized from (18)F-F(-) to re-evaluate this technique on normal subjects and patients with PD, together with D2 receptor imaging with (11)C-raclopride (RAC)...
December 2, 2016: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/27913958/the-effect-of-mass-transfer-parameterization-and-ice-retention-on-the-scavenging-and-redistribution-of-so2-by-a-deep-convective-cloud
#3
Vladan Vučković, Dragana Vujović
A chemistry module with the aqueous chemistry coupled with the complex 3D nonhydrostatic atmospheric model is used to investigate how the representation of gas-aqueous mass transfer and ice retention affect the SO2 redistribution in the presence of a convective cloud. Gas uptake to the liquid water is calculated using both Henry's law equilibrium (HE) and kinetic mass transport (KMT). The constant retention coefficients for SO2 (k ret = 0.46) and for H2O2 (k ret = 0.64) are used. It is shown that the amount of SO2 in the air at higher altitudes (10-12 km) is greater when partial retention (PR) is included...
December 2, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27913585/the-influence-of-placental-metabolism-on-fatty-acid-transfer-to-the-fetus
#4
Simone Perazzolo, Birgit Hirschmugl, Christian Wadsack, Gernot Desoye, Rohan M Lewis, Bram G Sengers
The factors determining Fatty acid transfer across the placenta are not fully understood. This study used a combined experimental and computational modelling approach to explore placental transfer of non-esterified fatty acids and identify rate-determining processes. The isolated perfused human placenta was used to study the uptake and transfer of [(13)C]-fatty acids and the release of endogenous fatty acids. Only 6.2 ± 0.8% of the maternal (13)C-fatty acids taken up by the placenta was delivered to the fetal circulation...
December 2, 2016: Journal of Lipid Research
https://www.readbyqxmd.com/read/27913309/sequence-determinants-of-the-caenhorhabditis-elegansdopamine-transporter-dictating-in-vivoaxonal-export-and-synaptic-localization
#5
Sarah B Robinson, J Andrew Hardaway, Shannon L Hardie, Jane Wright, Ryan M Glynn, Daniel P Bermingham, Qiao Han, Sarah M Sturgeon, Phyllis Freeman, Randy D Blakely
The monoamine neurotransmitter dopamine (DA) acts across phylogeny to modulate both simple and complex behaviors. The presynaptic DA transporter (DAT) is a major determinant of DA signaling capacity in ensuring efficient extracellular DA clearance. In humans, DAT is also a major target for prescribed and abused psychostimulants. Multiple structural determinants of DAT function and regulation have been defined, though largely these findings have arisen from heterologous expression or ex vivo cell culture studies...
November 29, 2016: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/27912877/riceberry-bran-extract-prevents-renal-dysfunction-and-impaired-renal-organic-anion-transporter-3-oat3-function-by-modulating-the-pkc-nrf2-pathway-in-gentamicin-induced-nephrotoxicity-in-rats
#6
Phatchawan Arjinajarn, Anchalee Pongchaidecha, Nuttawud Chueakula, Krit Jaikumkao, Varanuj Chatsudthipong, Sugunya Mahatheeranont, Orranuch Norkaew, Nipon Chattipakorn, Anusorn Lungkaphin
PURPOSE: This study investigated the protective effects of Riceberry bran extract (RBBE) on renal function, and the function and expression of renal organic anion transporter 3 (Oat3) in gentamicin-induced nephrotoxicity in rats and explored the mechanisms for its protective effects. MATERIAL AND METHODS: Male Sprague Dawley rats (n= 42) were divided into six groups to receive normal saline, gentamicin (100mg/kg), co-treatment of gentamicin and RBBE (at dose of 250, 500 and 1000mg/kg), and RBBE (at dose of 1000mg/kg) only, for consecutive fifteen days...
December 15, 2016: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/27911896/different-mutations-in-a-p-type-atpase-transporter-in-leishmania-parasites-are-associated-with-cross-resistance-to-two-leading-drugs-by-distinct-mechanisms
#7
Christopher Fernandez-Prada, Isabel M Vincent, Marie-Christine Brotherton, Mathew Roberts, Gaétan Roy, Luis Rivas, Philippe Leprohon, Terry K Smith, Marc Ouellette
Leishmania infantum is an etiological agent of the life-threatening visceral form of leishmaniasis. Liposomal amphotericin B (AmB) followed by a short administration of miltefosine (MF) is a drug combination effective for treating visceral leishmaniasis in endemic regions of India. Resistance to MF can be due to point mutations in the miltefosine transporter (MT). Here we show that mutations in MT are also observed in Leishmania AmB-resistant mutants. The MF-induced MT mutations, but not the AmB induced mutations in MT, alter the translocation/uptake of MF...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27911305/nitrosylation-of-vesicular-transporters-in-brain-of-amyloid-precursor-protein-presenilin-1-double-transgenic-mice
#8
Ying Wang, Zhu Zhou, Hua Tan, Shenghua Zhu, Yiran Wang, Yingxia Sun, Xin-Min Li, Jun-Feng Wang
Nitric oxide can attack thiol groups of cysteine residues in proteins and induce protein cysteine S-nitrosylation. Cholinergic and glutamatergic systems are dysregulated in Alzheimer's disease. Vesicular acetylcholine transporter (VAChT) and vesicular glutamate transporter 1 (VGLUT1) are important in packaging acetylcholine and glutamate into vesicles, which is an important step for neurotransmission. Previously we found that VAChT and VGLUT1 can be nitrosylated and that S-nitrosylation of these transporters inhibits vesicular uptake of acetylcholine and glutamate...
November 26, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27910773/giant-oyster-mushroom-pleurotus-giganteus-agaricomycetes-enhances-adipocyte-differentiation-and-glucose-uptake-via-activation-of-ppar%C3%AE-and-glucose-transporters-1-and-4-in-3t3-l1-cells
#9
Puvaneswari Paravamsivam, Chua Kek Heng, Sri Nurestri Abdul Malek, Vikineswary Sabaratnam, Ravishankar Ram M, Umah Rani Kuppusamy
The edible mushroom Pleurotus giganteus was tested for its effect on adipocyte differentiation and glucose uptake activity in 3T3-L1 cells. The basidiocarps of P. giganteus were soaked in methanol to obtain a crude methanol extract and then fractionated to obtain an ethyl acetate extract. In this study, cell proliferation was measured using an MTT assay, lipid accumulation using an Oil Red O assay, and glucose uptake using a fluorescence glucose uptake assay. Gene expression was measured via real-time polymerase chain reaction analysis with TaqMan primer...
2016: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/27909743/r59949-a-diacylglycerol-kinase-inhibitor-inhibits-inducible-nitric-oxide-production-through-decreasing-transplasmalemmal-l-arginine-uptake-in-vascular-smooth-muscle-cells
#10
Tomoko Shimomura, Tomoyuki Nakano, Kaoru Goto, Ichiro Wakabayashi
Although diacylglycerol kinase (DGK) is known to be expressed in vascular smooth muscle cell, its functional significance remains to be clarified. We hypothesized that DGK is involved in the pathway of cytokine-induced nitric oxide (NO) production in vascular smooth muscle cells. The purpose of this study was to investigate the effects of R59949, a diacylglycerol kinase inhibitor, on inducible nitric oxide production in vascular smooth muscle cell. Cultured rat aortic smooth muscle cells (RASMCs) were used to elucidate the effects of R59949 on basal and interleukin-1β (IL-1β)-induced NO production...
December 1, 2016: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/27909713/age-associated-differences-in-transporter-gene-expression-in-kidneys-of-male-rats
#11
Yong-Ji Xu, Yang Wang, Yuan-Fu Lu, Shang-Fu Xu, Qin Wu, Jie Liu
Kidney transporters are involved in the secretion and reabsorption of endogenous and exogenous molecules. Numerous factors may influence their expression and affect drug disposition, efficacy and toxicity. The present study aimed to examine the development‑ and age‑associated variations in primary renal transporters in rats, including 6 uptake transporters: Organic anion transporter (OAT) 1 and 3, organic cation transporter (OCT) 1, 2 and 3 and organic anion‑transporting polypeptide (OATP) 4C1, and 6 efflux transporters: Multidrug resistance protein 1 (MDR1), breast cancer resistance protein (BCRP), multidrug resistance‑associated protein (MRP) 2 and 4, and multidrug and toxin extrusion protein (MATE) 1 and 2‑K...
November 28, 2016: Molecular Medicine Reports
https://www.readbyqxmd.com/read/27909574/characterization-of-5-2-18-f-fluoroethoxy-l-tryptophan-for-pet-imaging-of-the-pancreas
#12
Ahmed Abbas, Christine Beamish, Rebecca McGirr, John Demarco, Neil Cockburn, Dawid Krokowski, Ting-Yim Lee, Michael Kovacs, Maria Hatzoglou, Savita Dhanvantari
Purpose: In diabetes, pancreatic beta cell mass declines significantly prior to onset of fasting hyperglycemia. This decline may be due to endoplasmic reticulum (ER) stress, and the system L amino acid transporter LAT1 may be a biomarker of this process. In this study, we used 5-(2- (18)F-fluoroethoxy)-L-tryptophan ( (18)F-L-FEHTP) to target LAT1 as a potential biomarker of beta cell function in diabetes. Procedures: Uptake of (18)F-L-FEHTP was determined in wild-type C57BL/6 mice by ex vivo biodistribution...
2016: F1000Research
https://www.readbyqxmd.com/read/27909264/global-ablation-of-the-mitochondrial-calcium-uniporter-increases-glycolysis-in-cortical-neurons-subjected-to-energetic-stressors
#13
Matthew Nichols, Pia A Elustondo, Jordan Warford, Aruloli Thirumaran, Evgeny V Pavlov, George S Robertson
The effects of global mitochondrial calcium (Ca(2+)) uniporter (MCU) deficiency on hypoxic-ischemic (HI) brain injury, neuronal Ca(2+) handling, bioenergetics and hypoxic preconditioning (HPC) were examined. Forebrain mitochondria isolated from global MCU nulls displayed markedly reduced Ca(2+) uptake and Ca(2+)-induced opening of the membrane permeability transition pore. Despite evidence that these effects should be neuroprotective, global MCU nulls and wild-type (WT) mice suffered comparable HI brain damage...
December 1, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27908230/dna-import-into-mitochondria
#14
REVIEW
Yu M Konstantinov, A Dietrich, F Weber-Lotfi, N Ibrahim, E S Klimenko, V I Tarasenko, T A Bolotova, M V Koulintchenko
In recent decades, it has become evident that the condition for normal functioning of mitochondria in higher eukaryotes is the presence of membrane transport systems of macromolecules (proteins and nucleic acids). Natural competence of the mitochondria in plants, animals, and yeasts to actively uptake DNA may be directly related to horizontal gene transfer into these organelles occurring at much higher rate compared to the nuclear and chloroplast genomes. However, in contrast with import of proteins and tRNAs, little is known about the biological role and molecular mechanism underlying import of DNA into eukaryotic mitochondria...
October 2016: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/27907003/mapping-cholesterol-interaction-sites-on-serotonin-transporter-through-coarse-grained-molecular-dynamics
#15
Mariarosaria Ferraro, Matteo Masetti, Maurizio Recanatini, Andrea Cavalli, Giovanni Bottegoni
Serotonin transporter (SERT) modulates serotonergic signaling via re-uptake of serotonin in pre-synaptic cells. The inclusion in cholesterol-enriched membrane domains is crucial for SERT activity, suggesting a cross-talk between the protein and the sterol. Here, we develop a protocol to identify potential cholesterol interaction sites coupling statistical analysis to multi-microsecond coarse-grained molecular dynamics simulations of SERT in a previously validated raft-like membrane model. Six putative sites were found, including a putative CRAC motif on TM4 and a CARC motif on TM10...
2016: PloS One
https://www.readbyqxmd.com/read/27906635/a-specific-inhibitor-of-lactate-dehydrogenase-overcame-the-resistance-toward-gemcitabine-in-hypoxic-mesothelioma-cells-and-modulated-the-expression-of-the-human-equilibrative-transporter-1
#16
Elisa Giovannetti, Leticia G Leon, Valentina E Gómez, Paolo A Zucali, Filippo Minutolo, Godefridus J Peters
Malignant pleural mesothelioma (MPM) is a very hypoxic malignancy, and hypoxia has been associated with resistance towards gemcitabine. The muscle-isoform of lactate dehydrogenase (LDH-A) constitutes a major checkpoint for the switch to anaerobic glycolysis. Therefore we investigated the combination of a new LDH-A inhibitor (NHI-1) with gemcitabine in MPM cell lines. Under hypoxia (O2 tension of 1%) the cell growth inhibitory effects of gemcitabine, were reduced, as demonstrated by a 5- to 10-fold increase in IC50s...
December 2016: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/27906634/extended-exposure-to-substrate-regulates-the-human-equilibrative-nucleoside-transporter-1-hent1
#17
Maliha Zafar, Zlatina Naydenova, Imogen R Coe
Human equilibrative nucleoside transporter 1 (hENT1) is a major route of entry of nucleosides and nucleoside analog drugs. The regulation of hENT1 is poorly understood in spite of its clinical importance as a drug transporter. Immunofluorescence microscopy and fluorescence-activated cell sorting suggested that cytidine pre-treatment (40 μM, 6 h) promotes hENT1 internalization in a way that does not affect either hENT1-mediated nucleoside uptake or gemcitabine-induced cytotoxicity. The Scatchard plot analyses of our NBTI binding data support previous speculations that hENT1 proteins exist as two sub-populations, and suggest that cytidine pre-treatment leads to the internalization of one population...
December 2016: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/27906617/evaluation-of-cellular-purine-transport-and-metabolism-in-the-caco-2-cell-using-comprehensive-high-performance-liquid-chromatography-method-for-analysis-of-purines
#18
T Fukuuchi, M Kobayashi, N Yamaoka, K Kaneko
Using Caco-2 cells and our previously developed high-performance liquid chromatography method for quantification of purine bases, nucleosides, and nucleotides, we evaluated cellular purine transport and uptake. The analytes were separated using YMC-Triart C18 column with gradient elution. We used Caco-2 cells as intestinal model cells and monitored purine transport across a monolayer for 2 h. The degree of change of purine concentrations in the permeate was very slight; however, it was possible to simultaneously determine these parameters for all purines because of our method's high sensitivity...
December 2016: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/27906079/muscle-specific-loss-of-bmal1-leads-to-disrupted-tissue-glucose-metabolism-and-systemic-glucose-homeostasis
#19
Brianna D Harfmann, Elizabeth A Schroder, Maureen T Kachman, Brian A Hodge, Xiping Zhang, Karyn A Esser
BACKGROUND: Diabetes is the seventh leading cause of death in the USA, and disruption of circadian rhythms is gaining recognition as a contributing factor to disease prevalence. This disease is characterized by hyperglycemia and glucose intolerance and symptoms caused by failure to produce and/or respond to insulin. The skeletal muscle is a key insulin-sensitive metabolic tissue, taking up ~80 % of postprandial glucose. To address the role of the skeletal muscle molecular clock to insulin sensitivity and glucose tolerance, we generated an inducible skeletal muscle-specific Bmal1 (-/-) mouse (iMSBmal1 (-/-))...
March 30, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27904971/mutations-in-slc5a6-associated-with-brain-immune-bone-and-intestinal-dysfunction-in-a-young-child
#20
Veedamali S Subramanian, Alexandru R Constantinescu, Paul J Benke, Hamid M Said
The human sodium-dependent multivitamin transporter (hSMVT) is a product of the SLC5A6 gene and mediates biotin, pantothenic acid, and lipoate uptake in a variety of cellular systems. We report here the identification of mutations R94X, a premature termination, and R123L, a dysfunctional amino acid change, both in exon 3 of the SLC5A6 gene in a child using whole genome-scanning. At 15 months of age, the child showed failure to thrive, microcephaly and brain changes on MRI, cerebral palsy and developmental delay, variable immunodeficiency, and severe gastro-esophageal reflux requiring a gastrostomy tube/fundoplication, osteoporosis, and pathologic bone fractures...
November 30, 2016: Human Genetics
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