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pH homeostasis

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https://www.readbyqxmd.com/read/28322358/inhibitory-effects-of-nitrite-on-acid-%C3%A2-production-in-dental-plaque-in-children
#1
Yuji Yamamoto, Jumpei Washio, Koichi Shimizu, Koei Igarashi, Nobuhiro Takahashi
PURPOSE: To assess the inhibitory effects of nitrite on plaque acidogenicity and its relationship with caries experience. MATERIALS AND METHODS: Plaque (2 μl) was collected from 76 children (age 5.8 = 2.6 years, dmft = 2.9 = 3.5, DMTF = 0.6 = 1.4) and mixed with nitrite solution (final concentration = 0.63 mM) or distilled water (control). The initial pH (pH-0) of each sample was measured using a portable pH meter. The samples were incubated for 10 min, then their pH (pH-1) was measured again...
March 20, 2017: Oral Health & Preventive Dentistry
https://www.readbyqxmd.com/read/28322335/identification-of-an-rnase-that-preferentially-cleaves-a-g-nucleotides
#2
Jumin Xie, Zhen Chen, Xueyan Zhang, Honghe Chen, Wuxiang Guan
Ribonucleases play an important role in the RNA metabolism which is critical for the localization, stability and function of mature RNA transcripts. More and more ribonucleases were discovered in recent years with the progress of technology. In the present study, we found that the uncharacterized C19orf43, a novel interacting protein of human telomerase RNA (hTR), digested T7 transcribed RNA, total cellular RNA and RNA oligos but not DNA. Thus we named this new RNase as hTRIR (human telomerase RNA interacting RNase)...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317979/fluorescent-bioimaging-of-ph-from-design-to-applications
#3
Ji-Ting Hou, Wen Xiu Ren, Kun Li, Jinho Seo, Amit Sharma, Xiao-Qi Yu, Jong Seung Kim
Protons play crucial roles in many physiological and pathological processes, such as receptor-mediated signal transduction, ion transport, endocytosis, homeostasis, cell proliferation, and apoptosis. The urgent demand for pH imaging and measurement in biological systems has incited the development of fluorescent pH probes. Numerous fluorescent probes have been reported, but many lack the abilities needed for biological applications. Hence, the development of new pH probes with better biocompatibility, sensitivity, and site-specificity is still indispensable...
March 20, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28299282/extracellular-proton-concentrations-impacts-ln229-glioblastoma-tumor-cell-fate-via-differential-modulation-of-surface-lipids
#4
Sebastian John, K C Sivakumar, Rashmi Mishra
BACKGROUND: Glioblastoma multiforme (GBM) is a highly aggressive form of brain cancer with marginal survival rates. GBM extracellular acidosis can profoundly impact its cell fate heterogeneities and progression. However, the molecules and mechanisms that enable GBM tumor cells acid adaptation and consequent cell fate competencies are weakly understood. Since extracellular proton concentrations (pHe) directly intercept the tumor cell plasma membrane, surface lipids must play a crucial role in pHe-dependent tumor cell fate dynamics...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28292724/deleterious-role-of-trace-elements-silica-and-lead-in-the-development-of-chronic-kidney-disease
#5
Starlaine Mascarenhas, Srikanth Mutnuri, Anasuya Ganguly
Chronic-Kidney-Disease of Unknown-etiology (CKDu) has been reported in developing-countries like Sri-Lanka, India and Central-America without sparing the Indian sub-district (namely Canacona) located in south-Goa. The disease etiology is unlinked to common causes of diabetes and hypertension and assumed to be environmentally induced due to its asymptomatic-nature and occurrence in groundwater relying communities. This study aimed to understand environmental risk-factors underlying CKDu-etiology using Indian sub-district (Canacona) as case-study...
March 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/28280108/moderate-and-intense-muscular-exercises-induce-marked-intramyocellular-metabolic-acidosis-in-sickle-cell-disease-mice
#6
Benjamin Chatel, Laurent André Messonnier, Christophe Hourdé, Christophe Vilmen, Monique Bernard, David Bendahan
Sickle cell disease (SCD) is associated with an impaired oxygen delivery to skeletal muscle that could alter ATP production processes. The present study aimed to determine the effects of sickle hemoglobin (HbS) on muscle pH homeostasis in response to exercise in homozygous (HbSS, n = 9) and heterozygous (HbAS, n = 10) SCD (Townes) mice in comparison to control (HbAA, n = 10) littermates. Magnetic resonance spectroscopy of phosphorus 31 enabled to measure intramuscular pH (pHi) and phosphocreatine (PCr) concentration during rest-stimulation-recovery protocols at two different intensities...
March 9, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28276312/targeting-and-insertion-of-membrane-proteins
#7
Andreas Kuhn, Hans-Georg Koch, Ross E Dalbey
The insertion and assembly of proteins into the inner membrane of bacteria are crucial for many cellular processes, including cellular respiration, signal transduction, and ion and pH homeostasis. This process requires efficient membrane targeting and insertion of proteins into the lipid bilayer in their correct orientation and proper conformation. Playing center stage in these events are the targeting components, signal recognition particle (SRP) and the SRP receptor FtsY, as well as the insertion components, the Sec translocon and the YidC insertase...
March 2017: EcoSal Plus
https://www.readbyqxmd.com/read/28271502/trigonelline-and-vildagliptin-antidiabetic-effect-improvement-of-insulin-signalling-pathway
#8
Amat-Alrazaq A Aldakinah, Muhammad Y Al-Shorbagy, Dalaal M Abdallah, Hanan S El-Abhar
OBJECTIVES: Trigonelline (TRG) is known to have an antidiabetic efficacy; however, its mechanism is not entirely elucidated. METHODS: Hence, its effect on insulin signaling, besides its effectiveness in combination with vildagliptin (VLD) in a Type 2 diabetes model has been tested. KEY FINDINGS: TRG (50 mg/kg; p.o) lowered serum glucose, fructosamine, insulin, and HOMA-IR index and increased insulin sensitivity in soleus muscle via augmenting insulin receptor autophosphorylation (IR-PH), pT308-Akt, and glucose transporter 4 (GLUT4)...
March 8, 2017: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/28270628/temperature-induced-remodeling-of-the-photosynthetic-machinery-tunes-photosynthesis-in-a-thermophyllic-alga
#9
Denitsa Nikolova, Dieter Weber, Martin Scholz, Till Bald, Jörn Peter Scharsack, Michael Hippler
The thermophilic alga C. merolae thrives in extreme environments (low pH and temperature between 40 and 56{degree sign}C. In this study we investigated the acclimation process of the alga to a colder temperature (25{degree sign}C). A long-term cell growth experiment revealed an extensive remodeling of the photosynthetic apparatus in the first 250 h of acclimation, which was followed by cell growth to an even higher density than the control (grown at 42{degree sign}C) cell density. Once the cells were shifted to the lower temperature, the proteins of the light-harvesting antenna were greatly down regulated and the phycobilisome (PBS) composition was altered...
March 7, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28268199/role-of-leishmanial-acidocalcisomal-pyrophosphatase-in-the-camp-homeostasis-in-phagolysosome-conditions-required-for-intra-macrophage-survival
#10
Arunima Biswas, Arijit Bhattacharya, Amit Vij, Pijush K Das
Exposure of Leishmania donovani to macrophage phagolysosome conditions (PC) (37°C and pH 5.5) led to increased intracellular cAMP and cAMP-mediated responses, which help in intra-macrophage survival pre-requisite for infectivity. In the absence of typical orthologs for G-proteins and G-protein coupled receptors, we sought to study the precise mechanisms for positive modulation of cAMP production during exposure to PC. Amongst two promastigote-stage specific membrane bound receptor adenylate cyclases (LdRAC-A and LdRAC-B), LdRAC-A appeared to function as a major cAMP generator following PC exposure...
March 6, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28262793/characterization-of-cholesterol-homeostasis-in-sphingosine-1-phosphate-lyase-deficient-fibroblasts-reveals-a-niemann-pick-disease-type-c-like-phenotype-with-enhanced-lysosomal-ca-2-storage
#11
Hans Vienken, Nathalie Mabrouki, Katja Grabau, Ralf Frederik Claas, Agnes Rudowski, Nina Schömel, Josef Pfeilschifter, Dieter Lütjohann, Gerhild van Echten-Deckert, Dagmar Meyer Zu Heringdorf
Sphingosine-1-phosphate (S1P) lyase irreversibly cleaves S1P, thereby catalysing the ultimate step of sphingolipid degradation. We show here that embryonic fibroblasts from S1P lyase-deficient mice (Sgpl1(-/-)-MEFs), in which S1P and sphingosine accumulate, have features of Niemann-Pick disease type C (NPC) cells. In the presence of serum, overall cholesterol content was elevated in Sgpl1(-/-)-MEFs, due to upregulation of the LDL receptor and enhanced cholesterol uptake. Despite this, activation of sterol regulatory element-binding protein-2 was increased in Sgpl1(-/-)-MEFs, indicating a local lack of cholesterol at the ER...
March 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28262486/lateral-gene-transfer-in-the-adaptation-of-the-anaerobic-parasite-blastocystis-to-the-gut
#12
Laura Eme, Eleni Gentekaki, Bruce Curtis, John M Archibald, Andrew J Roger
Blastocystis spp. are the most prevalent eukaryotic microbes found in the intestinal tract of humans. Here we present an in-depth investigation of lateral gene transfer (LGT) in the genome of Blastocystis sp. subtype 1. Using rigorous phylogeny-based methods and strict validation criteria, we show that ∼2.5% of the genes of this organism were recently acquired by LGT. We identify LGTs both from prokaryote and eukaryote donors. Several transfers occurred specifically in ancestors of a subset of Blastocystis subtypes, demonstrating that LGT is an ongoing process...
March 20, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28261168/common-distribution-of-gad-operon-in-lactobacillus-brevis-and-its-gada-contributes-to-efficient-gaba-synthesis-toward-cytosolic-near-neutral-ph
#13
Qinglong Wu, Hein Min Tun, Yee-Song Law, Ehsan Khafipour, Nagendra P Shah
Many strains of lactic acid bacteria (LAB) and bifidobacteria have exhibited strain-specific capacity to produce γ-aminobutyric acid (GABA) via their glutamic acid decarboxylase (GAD) system, which is one of amino acid-dependent acid resistance (AR) systems in bacteria. However, the linkage between bacterial AR and GABA production capacity has not been well established. Meanwhile, limited evidence has been provided to the global diversity of GABA-producing LAB and bifidobacteria, and their mechanisms of efficient GABA synthesis...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28257848/molecular-characterization-of-pacific-white-shrimp-litopenaeus-vannamei-sodium-bicarbonate-cotransporter-nbc-and-its-role-in-response-to-ph-stress
#14
Yi-Ming Cai, Ting Chen, Chun-Hua Ren, Wen Huang, Xiao Jiang, Yan Gao, Da Huo, Chao-Qun Hu
The sodium bicarbonate cotransporter (NBC) is an integral membrane ion transporter that can transport HCO3(-) (or a related species, such as CO3(2-)) across the plasma membrane. Previous researches revealed that NBC might play an important role in the regulation of intracellular pH in vertebrates. In the present study, an NBC cDNA was identified from Pacific white shrimp (Litopenaeus vannamei) and designated as Lv-NBC. The full-length Lv-NBC cDNA is 4479 bp in size, containing a 5'-untranslated region (UTR) of 59 bp, a 3'-UTR of 835 bp and an open reading frame (ORF) of 3585 bp that encodes a protein of 1194 amino acids with a deduced molecular weight of 134...
February 28, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28254758/role-of-mct1-and-caii-in-skeletal-muscle-ph-homeostasis-energetics-and-function-in-vivo-insights-from-mct1-haploinsufficient-mice
#15
Benjamin Chatel, David Bendahan, Christophe Hourdé, Luc Pellerin, Sylvain Lengacher, Pierre Magistretti, Yann Le Fur, Christophe Vilmen, Monique Bernard, Laurent A Messonnier
The purpose of this study was to investigate the effects of a partial suppression of monocarboxylate transporter (MCT)-1 on skeletal muscle pH, energetics, and function (MCT1(+/-) mice). Twenty-four MCT1(+/-) and 13 wild-type (WT) mice were subjected to a rest-exercise-recovery protocol, allowing assessment of muscle energetics (by magnetic resonance spectroscopy) and function. The study included analysis of enzyme activities and content of protein involved in pH regulation. Skeletal muscle of MCT1(+/-) mice had lower MCT1 (-61%; P < 0...
March 2, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28247968/breaking-up-and-making-up-the-secret-life-of-the-vacuolar-h-atpase
#16
REVIEW
Rebecca A Oot, Sergio Couoh-Cardel, Stuti Sharma, Nicholas J Stam, Stephan Wilkens
The vacuolar ATPase (V-ATPase; V1 Vo -ATPase) is a large multisubunit proton pump found in the endomembrane system of all eukaryotic cells where it acidifies the lumen of subcellular organelles including lysosomes, endosomes, the Golgi apparatus and clathrin coated vesicles. V-ATPase function is essential for pH and ion homeostasis, protein trafficking, endocytosis, mechanistic target of rapamycin (mTOR) and Notch signaling, as well as hormone secretion and neurotransmitter release. V-ATPase can also be found in the plasma membrane of polarized animal cells where its proton pumping function is involved in bone remodeling, urine acidification and sperm maturation...
March 1, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28246364/elevated-cholesterol-in-the-coxiella-burnetii-intracellular-niche-is-bacteriolytic
#17
Minal Mulye, Dhritiman Samanta, Seth Winfree, Robert A Heinzen, Stacey D Gilk
Coxiella burnetii is an intracellular bacterial pathogen and a significant cause of culture-negative endocarditis in the United States. Upon infection, the nascent Coxiella phagosome fuses with the host endocytic pathway to form a large lysosome-like vacuole called the parasitophorous vacuole (PV). The PV membrane is rich in sterols, and drugs perturbing host cell cholesterol homeostasis inhibit PV formation and bacterial growth. Using cholesterol supplementation of a cholesterol-free cell model system, we found smaller PVs and reduced Coxiella growth as cellular cholesterol concentration increased...
February 28, 2017: MBio
https://www.readbyqxmd.com/read/28244112/in-vitro-fermentation-of-oat-%C3%AE-glucan-and-hydrolysates-by-fecal-microbiota-and-selected-probiotic-strains
#18
Dong Ji-Lin, Yu-Xiao, Dong-Lianger, Shen Rui-Ling
BACKGROUND: Emerging evidence suggested that the prebiotic ability of β-glucan was intimately related to its molecular weight (Mw ). However, the effect of oat β-glucan with different Mw on gut homeostasis was inconsistent. Importantly, the understanding of the fermentation properties of oat β-glucan fractions was still limited. The aim of this study was to evaluate the prebiotic potential of raw and hydrolyzed oat β-glucan during in vitro fermentation by fecal microbiota and selected probiotic strains...
February 28, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28237098/measurement-of-autolysosomal-ph-by-dual-wavelength-ratio-imaging
#19
A Saric, S Grinstein, S A Freeman
Cellular components sequestered by autophagosomes during macroautophagy must be degraded and their components recycled in order to maintain homeostasis. To this end cells orchestrate the fusion of autophagosomes with lysosomes, degradative organelles that are rich in hydrolases. Most of the lysosomal enzymes function optimally at low pH, and products of macromolecular catabolism are cotransported with protons across the autolysosomal membrane. These functions are facilitated by the ability of lysosomes to pump protons inward, acidifying their lumen...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28230813/characterization-of-carbonic-anhydrase-9-in-the-alimentary-canal-of-aedes-aegypti-and-its-relationship-to-homologous-mosquito-carbonic-anhydrases
#20
Daniel P Dixon, Leslie Van Ekeris, Paul J Linser
In the mosquito midgut, luminal pH regulation and cellular ion transport processes are important for the digestion of food and maintenance of cellular homeostasis. pH regulation in the mosquito gut is affected by the vectorial movement of the principal ions including bicarbonate/carbonate and protons. As in all metazoans, mosquitoes employ the product of aerobic metabolism carbon dioxide in its bicarbonate/carbonate form as one of the major buffers of cellular and extracellular pH. The conversion of metabolic carbon dioxide to bicarbonate/carbonate is accomplished by a family of enzymes encoded by the carbonic anhydrase gene family...
February 21, 2017: International Journal of Environmental Research and Public Health
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