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Uptake transporters

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https://www.readbyqxmd.com/read/29342185/nanocarrier-mediated-foliar-zinc-fertilization-influences-expression-of-metal-homeostasis-related-genes-in-flag-leaves-and-enhances-gluten-content-in-durum-wheat
#1
Paresh Deshpande, Ashwin Dapkekar, Manoj Oak, Kishore Paknikar, Jyutika Rajwade
BACKGROUND: Wheat is the staple food for most of the world's population; however, it is a poor source of zinc. Foliar fertilization of zinc via zinc loaded chitosan nanocarriers (Zn-CNP) post-anthesis has proved to be a promising approach for grain zinc enhancement in durum wheat as evidenced in our earlier study. However, the molecular mechanism of uptake of zinc via Zn-CNP remains unclear. METHODS/PRINCIPLE FINDINGS: Foliar application of Zn-CNP was performed at post anthesis stages in two durum wheat cultivars (MACS 3125 and UC1114, containing the Gpc-B1 gene), and expression levels of several metal-related genes were analyzed during early senescence...
2018: PloS One
https://www.readbyqxmd.com/read/29341617/enhancing-docetaxel-delivery-to-multidrug-resistant-cancer-cells-with-albumin-coated-nanocrystals
#2
Sheryhan F Gad, Joonyoung Park, Ji Eun Park, Gihan N Fetih, Sozan S Tous, Wooin Lee, Yoon Yeo
Intravenous delivery of poorly water-soluble anticancer drugs such as docetaxel (DTX) is challenging due to the low bioavailability and the toxicity related to solubilizing excipients. Colloidal nanoparticles are used as alternative carriers, but low drug loading capacity and circulation instability limit their clinical translation. To address these challenges, DTX nanocrystals (NCs) were prepared using Pluronic F127 as an intermediate stabilizer and albumin as a functional surface modifier, which were previously found to be effective in producing small and stable NCs...
January 17, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29339668/proinflammatory-cytokines-and-oxidative-stress-decrease-the-transport-of-dopamine-precursor-tyrosine-in-human-fibroblasts
#3
Ravi Vumma, Jessica Johansson, Nikolaos Venizelos
BACKGROUND: Proinflammatory cytokines and oxidative stress responses have been extensively implicated in the pathophysiology of neuropsychiatric disorders over the past 2 decades. Moreover, disturbed transport of the dopamine precursor (i.e., the amino acid tyrosine) has been demonstrated, in different studies, across fibroblast cell membranes obtained from neuropsychiatric patients. However, the role and influences of proinflammatory cytokines and oxidative stress, and the reasons for disturbed tyrosine transport in neuropsychiatric disorders, are still not evaluated...
January 16, 2018: Neuropsychobiology
https://www.readbyqxmd.com/read/29339398/assay-conditions-influence-affinities-of-rat-organic-cation-transporter-1-analysis-of-mutagenesis-in-the-modeled-outward-facing-cleft-by-measuring-effects-of-substrates-and-inhibitors-on-initial-uptake
#4
Valentin Gorboulev, Saba Rehman, Christoph Michael Albert, Ursula Roth, Marleen Julia Meyer, Mladen Vassielev Tzvetkov, Thomas Dieter Mueller, Hermann Koepsell
Effects of mutations in the modeled outward-open cleft of rat organic cation transporter 1 (rOCT1) on affinities of substrates and inhibitors were investigated. Human embryonic kidney (HEK) 293 cells were stably transfected with rOCT1 or rOCT1 mutants, and uptake of the substrates 1-methyl-4-phenylpyridinium+ (MPP+) and tetraethylammonium+ (TEA+) or inhibition of MPP+ uptake by the non-transported inhibitors tetrabutylammonium+ (TBuA+), tetrapentylammonium+ (TPeA+) and corticosterone was measured. Uptake measurements were performed on confluent cell layers using 2 min-incubation or in dissociated cells using incubation times of 1, 5, or 10 s...
January 16, 2018: Molecular Pharmacology
https://www.readbyqxmd.com/read/29339110/in-vitro-anti-diabetic-effect-of-flavonoids-and-pheophytins-from-allophylus-cominia-sw-on-the-glucose-uptake-assays-by-hepg2-l6-3t3-l1-and-fat-accumulation-in-3t3-l1-adipocytes
#5
D G Semaan, J O Igoli, L Young, A I Gray, E G Rowan, E Marrero
BACKGROUND AND PURPOSE: Based on ethno-botanical information collected from diabetic patients in Cuba and firstly reported inhibition of PTP1B and DPPIV enzymes activities, Allophylus cominia (A. cominia) was identified as possible source of new drugs that could be used for the treatment of type 2 diabetes mellitus (T2-DM). EXPERIMENTAL APPROACH: in this study, the activity of the characterised extracts from A. cominia was tested on the glucose uptake using HepG2 and L6 cells, 3T3-L1 fibroblasts and adipocytes as well as their effect on the fat accumulation using 3T3-L1 adipocytes...
January 12, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29339011/facilitators-and-barriers-to-healthy-pregnancy-spacing-among-medicaid-beneficiaries-findings-from-the-national-strong-start-initiative
#6
Caitlin Cross-Barnet, Brigette Courtot, Ian Hill, Sarah Benatar, Morgan Cheeks, Jenny Markell
BACKGROUND: Closely spaced, unintended pregnancies are common among Medicaid beneficiaries and create avoidable risks for women and infants, including preterm birth. The Strong Start for Mothers and Newborns Initiative, a program of the Center for Medicare and Medicaid Innovation, intended to prevent preterm birth through psychosocially based enhanced prenatal care in maternity care homes, group prenatal care, and birth centers. Comprehensive care offers the opportunity for education and family planning to promote healthy pregnancy spacing...
January 12, 2018: Women's Health Issues: Official Publication of the Jacobs Institute of Women's Health
https://www.readbyqxmd.com/read/29338971/atorvastatin-impaired-glucose-metabolism-in-c2c12-cells-partly-via-inhibiting-cholesterol-dependent-glucose-transporter-4-translocation
#7
Binbin Sun, Zeyu Zhong, Fan Wang, Jiong Xu, Feng Xu, Weimin Kong, Zhaoli Ling, Nan Shu, Ying Li, Tong Wu, Mian Zhang, Liang Zhu, Xiaodong Liu, Li Liu
Skeletal muscle accounts for approximately 75% of glucose disposal in body and statins impair glucose metabolism. We aimed to investigate the effect of atorvastatin on glucose metabolism in C2C12 cells. Glucose metabolism and expression of glucose transporter 4 (GLUT4) and hexokinase II (HXKII) were measured following incubation with atorvastatin or pravastatin. Roles of cholesterol in atorvastatin-induced glucose metabolism impairment were investigated via adding cholesterol or mevalonic acid and confirmed by cholesterol depletion with methyl-β-cyclodextrin...
January 12, 2018: Biochemical Pharmacology
https://www.readbyqxmd.com/read/29338771/regulation-of-aquaporins-in-plants-under-stress
#8
REVIEW
Ranganathan Kapilan, Maryam Vaziri, Janusz J Zwiazek
Aquaporins (AQP) are channel proteins belonging to the Major Intrinsic Protein (MIP) superfamily that play an important role in plant water relations. The main role of aquaporins in plants is transport of water and other small neutral molecules across cellular biological membranes. AQPs have remarkable features to provide an efficient and often, specific water flow and enable them to transport water into and out of the cells along the water potential gradient. Plant AQPs are classified into five main subfamilies including the plasma membrane intrinsic proteins (PIPs), tonoplast intrinsic proteins (TIPs), nodulin 26 like intrinsic proteins (NIPs), small basic intrinsic proteins (SIPs) and X intrinsic proteins (XIPs)...
January 16, 2018: Biological Research
https://www.readbyqxmd.com/read/29338214/a-tool-for-the-import-of-natural-and-unnatural-nucleoside-triphosphates-into-bacteria
#9
Aaron W Feldman, Emil C Fischer, Michael P Ledbetter, Jen-Yu Liao, John C Chaput, Floyd E Romesberg
Nucleoside triphosphates play a central role in biology, but efforts to study these roles have proven difficult because the levels of triphosphates are tightly regulated in a cell and because individual triphosphates can be difficult to label or modify. In addition, many synthetic biology efforts are focused on the development of unnatural nucleoside triphosphates that perform specific functions in the cellular environment. In general, both of these efforts would be facilitated by a general means to directly introduce desired triphosphates into cells...
January 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29338024/quantitative-in-vivo-mapping-of-myocardial-mitochondrial-membrane-potential
#10
Nathaniel M Alpert, Nicolas Guehl, Leon Ptaszek, Matthieu Pelletier-Galarneau, Jeremy Ruskin, Moussa C Mansour, Dustin Wooten, Chao Ma, Kazue Takahashi, Yun Zhou, Timothy M Shoup, Marc D Normandin, Georges El Fakhri
BACKGROUND: Mitochondrial membrane potential (ΔΨm) arises from normal function of the electron transport chain. Maintenance of ΔΨm within a narrow range is essential for mitochondrial function. Methods for in vivo measurement of ΔΨm do not exist. We use 18F-labeled tetraphenylphosphonium (18F-TPP+) to measure and map the total membrane potential, ΔΨT, as the sum of ΔΨm and cellular (ΔΨc) electrical potentials. METHODS: Eight pigs, five controls and three with a scar-like injury, were studied...
2018: PloS One
https://www.readbyqxmd.com/read/29338012/using-geospatial-techniques-to-develop-an-emergency-referral-transport-system-for-suspected-sepsis-patients-in-bangladesh
#11
Atique Iqbal Chowdhury, Rafiqul Haider, Abu Yousuf Md Abdullah, Aliki Christou, Nabeel Ashraf Ali, Ahmed Ehsnaur Rahman, Afrin Iqbal, Sanwarul Bari, D M Emdadul Hoque, Shams El Arifeen, Niranjan Kissoon, Charles P Larson
BACKGROUND: A geographic information system (GIS)-based transport network within an emergency referral system can be the key to reducing health system delays and increasing the chances of survival, especially during an emergency. We employed a GIS to design an emergency transport system for the rapid transfer of pregnant or early post-partum women, newborns, and children under 5 years of age with suspected sepsis under the Interrupting Pathways to Sepsis Initiative (IPSI) project. METHODS: A GIS database was developed by mapping the villages, roads, and relevant physical features of the study area...
2018: PloS One
https://www.readbyqxmd.com/read/29337306/zinc-transporter-slc39a8-is-essential-for-cardiac-ventricular-compaction
#12
Wen Lin, Deqiang Li, Lan Cheng, Li Li, Feiyan Liu, Nicholas J Hand, Jonathan A Epstein, Daniel J Rader
Isolated left ventricular noncompaction (LVNC) results from excessive trabeculation and impaired myocardial compaction during heart development. The extracellular matrix (ECM) that separates endocardium from myocardium plays a critical but poorly understood role in ventricular trabeculation and compaction. In an attempt to characterize solute carrier family 39 member 8-null (Slc39a8-null) mice, we discovered that homozygous null embryos do not survive embryogenesis, and exhibit a cardiac phenotype similar to human LVNC...
January 16, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29337216/in-vitro-lung-epithelial-cell-transport-and-anti-interleukin-8-releasing-activity-of-liposomal-ciprofloxacin
#13
Ruba S Darweesh, Masahiro Sakagami
As a promising long-acting inhaled formulation, liposomal ciprofloxacin (Lipo-CPFX) was characterized in the in vitro human lung epithelial Calu-3 cell monolayer system, compared to ciprofloxacin in solution (CPFX). Its modulated absorptive transport and uptake, and sustained inhibitory activity against induced pro-inflammatory interleukin-8 (IL-8) release were examined. The absorptive transport and uptake kinetics for Lipo-CPFX and CPFX were determined at 0.1-50 mg/ml in the Transwell system. The Lipo-CPFX transport was then challenged for mechanistic exploration via cell energy depletion, a reduced temperature, endocytosis and/or lipid fusion inhibition, and addition of excess non-loaded liposomes...
January 11, 2018: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29337138/let-7-suppresses-b-cell-activation-through-restricting-the-availability-of-necessary-nutrients
#14
Shuai Jiang, Wei Yan, Shizhen Emily Wang, David Baltimore
The control of uptake and utilization of necessary extracellular nutrients-glucose and glutamine-is an important aspect of B cell activation. Let-7 is a family of microRNAs known to be involved in metabolic control. Here, we employed several engineered mouse models, including B cell-specific overexpression of Lin28a or the let-7a-1/let-7d/let-7f-1 cluster (let-7adf) and knockout of individual let-7 clusters to show that let-7adf specifically inhibits T cell-independent (TI) antigen-induced immunoglobulin (Ig)M antibody production...
January 10, 2018: Cell Metabolism
https://www.readbyqxmd.com/read/29336455/5-vitamin-b12-derivatives-suitable-for-bioconjugation-via-the-amide-bond
#15
A Jackowska, M Chromiński, M Giedyk, D Gryko
Vitamin B12 is an attractive candidate for a drug or an imaging-agent carrier into cells, due to its dietary uptake and well established transport through glycoproteins. Utilization of this system requires an appropriate functionalization of vitamin B12 that both allows for the conjugation of therapeutics and does not interrupt its recognition by transport proteins. Modifications at the 5'-position on the ribose moiety are among a few approaches which meet the criteria. In this article we present vitamin B12 derivatives bearing either the amino or the carboxylic group at the 5'-position...
January 16, 2018: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29336266/design-synthesis-evaluation-and-computational-studies-of-nipecotic-acid-acetonaphthone-hybrids-as-potential-antiepileptic-agents
#16
Ankit Seth, Piyoosh A Sharma, Avanish Tripathi, Priyanka K Choubey, Pavan Srivastava, Prabhash N Tripathi, Sushant Kumar Shrivastava
BACKGROUND: Nipecotic acid is considered to be one of the most potent inhibitors of neuronal and glial γ- aminobutyric acid (GABA) uptake in vitro. However nipecotic acid does not readily cross the blood-brain barrier (BBB) following peripheral administration, owing to its hydrophilic nature. OBJECTIVE: A series of substituted acetonaphthones tethered nipecotic acid derivatives were designed and synthesized with an aim to improve the lipophilicity and the blood-brain barrier (BBB) permeation...
January 15, 2018: Medicinal Chemistry
https://www.readbyqxmd.com/read/29335649/hyaluronic-acid-based-nano-sized-drug-carrier-containing-gellan-gum-microspheres-as-potential-multifunctional-embolic-agent
#17
Ming Fang Hsu, Yen Sheng Tyan, Yu Chen Chien, Ming Wei Lee
The purpose of this study was to develop a gellan gum-based multifunctional embolic agent. Calibrated spherical gellan gum and nanoparticle-containing gellan gum microspheres were prepared via water-in oil emulsification method. Self-assembled nanoparticles composed of short-chain hyaluronic acid and polyethylenimine as the doxorubicin carrier were prepared. The short-chain hyaluronic acid/polyethylenimine/ doxorubicin (sHH/PH/Dox) with the mean size was 140 ± 8 nm. To examine sHH/PH/Dox nanoparticle uptake into cells, the results confirmed that sHH/PH nanoparticles as drug carrier can facilitate the transport of doxorubicin into HepG2 liver cancer cells...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29335553/mutations-in-ppe38-block-pe_pgrs-secretion-and-increase-virulence-of-mycobacterium-tuberculosis
#18
Louis S Ates, Anzaan Dippenaar, Roy Ummels, Sander R Piersma, Aniek D van der Woude, Kim van der Kuij, Fabien Le Chevalier, Dulce Mata-Espinosa, Jorge Barrios-Payán, Brenda Marquina-Castillo, Carolina Guapillo, Connie R Jiménez, Arnab Pain, Edith N G Houben, Robin M Warren, Roland Brosch, Rogelio Hernández-Pando, Wilbert Bitter
Mycobacterium tuberculosis requires a large number of secreted and exported proteins for its virulence, immune modulation and nutrient uptake. Most of these proteins are transported by the different type VII secretion systems1,2. The most recently evolved type VII secretion system, ESX-5, secretes dozens of substrates belonging to the PE and PPE families, which are named for conserved proline and glutamic acid residues close to the amino terminus3,4. However, the role of these proteins remains largely elusive 1 ...
January 15, 2018: Nature Microbiology
https://www.readbyqxmd.com/read/29335469/structural-basis-for-chitin-acquisition-by-marine-vibrio-species
#19
Anuwat Aunkham, Michael Zahn, Anusha Kesireddy, Karunakar Reddy Pothula, Albert Schulte, Arnaud Baslé, Ulrich Kleinekathöfer, Wipa Suginta, Bert van den Berg
Chitin, an insoluble polymer of N-acetylglucosamine, is one of the most abundant biopolymers on Earth. By degrading chitin, chitinolytic bacteria such as Vibrio harveyi are critical for chitin recycling and maintenance of carbon and nitrogen cycles in the world's oceans. A decisive step in chitin degradation is the uptake of chito-oligosaccharides by an outer membrane protein channel named chitoporin (ChiP). Here, we report X-ray crystal structures of ChiP from V. harveyi in the presence and absence of chito-oligosaccharides...
January 15, 2018: Nature Communications
https://www.readbyqxmd.com/read/29334320/human-dopamine-transporter-the-first-implementation-of-a-combined-in-silico-in-vitro-approach-revealing-the-substrate-and-inhibitor-specificities
#20
Teodora Djikic, Yasmina Martí, Francesca Spyrakis, Thorsten Lau, Paolo Benedetti, Gavin Davey, Patrick Schloss, Kemal Yelekci
Parkinson's disease (PD) is characterized by the loss of dopamine-generating neurons in the substantia nigra (SN) and corpus striatum (CS). Current treatments alleviate PD symptoms rather than exerting neuroprotective effect on dopaminergic neurons. New drugs targeting the dopaminergic neurons by specific uptake through the human dopamine transporter (hDAT) could represent a viable strategy for establishing selective neuroprotection. Molecules able to increase the bioactive amount of extracellular dopamine (DA), thereby enhancing and compensating a loss of dopaminergic neurotransmission, and to exert neuroprotective response because of their accumulation in the cytoplasm, are required...
January 15, 2018: Journal of Biomolecular Structure & Dynamics
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