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https://www.readbyqxmd.com/read/29352221/role-of-mettl20-in-regulating-%C3%AE-oxidation-and-heat-production-in-mice-under-fasting-or-ketogenic-conditions
#1
Tadahiro Shimazu, Tamio Furuse, Shabeesh Balan, Ikuko Yamada, Shuzo Okuno, Hiroko Iwanari, Takehiro Suzuki, Takao Hamakubo, Naoshi Dohmae, Takeo Yoshikawa, Shigeharu Wakana, Yoichi Shinkai
METTL20 is a seven-β-strand methyltransferase that is localised to the mitochondria and tri-methylates the electron transfer flavoprotein (ETF) β subunit (ETFB) at lysines 200 and 203. It has been shown that METTL20 decreases the ability of ETF to extract electrons from medium-chain acyl-coenzyme A (CoA) dehydrogenase (MCAD) and glutaryl-CoA dehydrogenase in vitro. METTL20-mediated methylation of ETFB influences the oxygen consumption rate in permeabilised mitochondria, suggesting that METTL20-mediated ETFB methylation may also play a regulatory role in mitochondrial metabolism...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352176/renal-scattered-tubular-like-cells-confer-protective-effects-in-the-stenotic-murine-kidney-mediated-by-release-of-extracellular-vesicles
#2
Xiangyu Zou, Soon Hyo Kwon, Kai Jiang, Christopher M Ferguson, Amrutesh S Puranik, Xiangyang Zhu, Lilach O Lerman
To test the hypothesis that intrinsic renal scattered tubular cells (STC-like cells) contribute to repairing injured tubular epithelial cells (TEC) by releasing extracellular vesicle (EV). EV released from primary cultured pig STC-like cells were confirmed by electron microscopy. Antimycin-A (AMA)-induced injured proximal TEC (PK1 cells) were co-cultured with STC-like cells, STC-like cells-derived EV, or EV-free conditioned-medium for 3 days. Cellular injury, oxidative stress and mitochondrial function were assessed...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348254/circulating-platelets-as-mediators-of-immunity-inflammation-and-thrombosis
#3
REVIEW
Milka Koupenova, Lauren Clancy, Heather A Corkrey, Jane E Freedman
Platelets, non-nucleated blood components first described over 130 years ago, are recognized as the primary cell regulating hemostasis and thrombosis. The vascular importance of platelets has been attributed to their essential role in thrombosis, mediating myocardial infarction, stroke, and venous thromboembolism. Increasing knowledge on the platelets' role in the vasculature has led to many advances in understanding not only how platelets interact with the vessel wall but also how they convey changes in the environment to other circulating cells...
January 19, 2018: Circulation Research
https://www.readbyqxmd.com/read/29345326/live-animal-imaging-of-renal-function-by-multiphoton-microscopy
#4
Kenneth W Dunn, Timothy A Sutton, Ruben M Sandoval
Intravital microscopy, microscopy of living animals, is a powerful research technique that combines the resolution and sensitivity found in microscopic studies of cultured cells with the relevance and systemic influences of cells in the context of the intact animal. The power of intravital microscopy has recently been extended with the development of multiphoton fluorescence microscopy systems capable of collecting optical sections from deep within the kidney at subcellular resolution, supporting high-resolution characterizations of the structure and function of glomeruli, tubules, and vasculature in the living kidney...
January 18, 2018: Current Protocols in Cytometry
https://www.readbyqxmd.com/read/29345305/detection-of-mitochondrial-haplogroups-in-a-small-avar-slavic-population-from-the-eigth-ninth-century-ad
#5
Lukáš Šebest, Marian Baldovič, Adam Frtús, Csaba Bognár, Klaudia Kyselicová, Ľudevít Kádasi, Radoslav Beňuš
OBJECTIVES: In the sixth century AD, Avars came to Central Europe from middle Eurasian steppes and founded a strong Empire called the Avar Khagante (568-799/803 AD) in the Pannonian basin. During the existence of this empire, they undertook many military and pugnacious campaigns. In the seventh century, they conquered the northern territory inhabited by Slavs, who were further recruited in Avar military and were commissioned with obtaining food supplies. During almost 200 years of Avar domination, a significant influence by the Avar culture (especially on the burial rite) and assimilation with indigenous population (occurrence of "East Asian"cranial features) could be noticed in this mixed area, which is supported by achaeological and anthropologcal research...
January 18, 2018: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/29343537/a-search-for-ceramide-binding-proteins-using-bifunctional-lipid-analogs-yields-cert-related-protein-stard7
#6
Svenja Bockelmann, John G M Mina, Sergei Korneev, Dina G Hassan, Dagmar Mueller, Angelika Hilderink, Hedwich C Vlieg, Reinout Raijmakers, Albert J R Heck, Per Haberkant, Joost C M Holthuis
Ceramides are central intermediates of sphingolipid metabolism with dual roles as mediators of cellular stress signalling and mitochondrial apoptosis. How ceramides exert their cytotoxic effects is unclear and their poor solubility in water hampers a search for specific protein interaction partners. In here, we report the application of a photoactivatable and clickable ceramide analogue, pacCer, to identify ceramide binding proteins and unravel the structural basis by which these proteins recognize ceramide...
January 17, 2018: Journal of Lipid Research
https://www.readbyqxmd.com/read/29339490/structural-basis-of-sterol-recognition-and-nonvesicular-transport-by-lipid-transfer-proteins-anchored-at-membrane-contact-sites
#7
Junsen Tong, Mohammad Kawsar Manik, Young Jun Im
Membrane contact sites (MCSs) in eukaryotic cells are hotspots for lipid exchange, which is essential for many biological functions, including regulation of membrane properties and protein trafficking. Lipid transfer proteins anchored at membrane contact sites (LAMs) contain sterol-specific lipid transfer domains [StARkin domain (SD)] and multiple targeting modules to specific membrane organelles. Elucidating the structural mechanisms of targeting and ligand recognition by LAMs is important for understanding the interorganelle communication and exchange at MCSs...
January 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29336483/glucose-metabolism-during-in-vitro-maturation-of-mouse-oocytes-an-study-using-rna-interference
#8
Hong-Li Xie, Shuai Zhu, Jie Zhang, Jing Wen, Hong-Jie Yuan, Liu-Zhu Pan, Ming-Jiu Luo, Jing-He Tan
In previous studies on glucose metabolism during in vitro maturation, intact cumulus-oocyte complexes (COCs) were treated with enzyme inhibitors/activators. Because inhibitors/activators may have non-specificity and/or toxicity, and culture of COCs cannot differentiate whether glucose metabolism of cumulus cells (CCs) or that of the oocyte supports oocyte maturation, results from the previous studies must be verified by silencing genes in either CCs or cumulus-denuded oocytes (DOs). In this study, RNAi was adopted to specify the effects of glucose metabolism in CCs or DOs on oocyte maturation...
January 16, 2018: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29330138/a-biogeographic-and-ecological-perspective-to-the-evolution-of-reproductive-behaviour-in-the-family-salamandridae
#9
Sarah Kieren, Max Sparreboom, Axel Hochkirch, Michael Veith
Amphibians have a complex reproductive behaviour, which shows the highest diversity among tetrapodes. The family Salamandridae, distributed across the entire Holarctic, is one of the most diverse groups of extant salamanders comprising 114 species in 21 genera. The family has a remarkable diversity of courtship modes, amplexus and sperm transfer. It is often hypothesised that this diversity has evolved in adaptation to a specific mating and/or breeding habitat. We test this hypothesis based upon a phylogenetic reconstruction using the complete mitochondrial genome sequences of 45 Salamandridae species, representing all existing genera...
January 9, 2018: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/29316553/oocyte-cytoplasmic-gas6-and-heparan-sulfate-hs-are-required-to-establish-the-open-chromatin-state-in-nuclei-during-remodeling-and-reprogramming
#10
Kyeoung-Hwa Kim, Eun-Young Kim, Su-Yeon Lee, Jung-Jae Ko, Kyung-Ah Lee
BACKGROUND/AIMS: Previously, we found that silencing of growth arrest-specific gene 6 (Gas6) in oocytes impaired cytoplasmic maturation, resulting in failure of sperm chromatin decondensation (SCD) and pronuclear (PN) formation after fertilization. Thus, we conducted this study to determine the effect of Gas6 RNAi on downstream genes and to elucidate the working mechanism of Gas6 on oocyte cytoplasmic maturation and SCD. METHODS: Using RT-PCR, Western blot and immunofluorescence, the expression levels of various target genes and the localization of heparan sulfate (HS) were analyzed after Gas6 RNAi...
December 22, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29301933/oxidation-of-the-fad-cofactor-to-the-8-formyl-derivative-in-human-electron-transferring-flavoprotein
#11
Peter Augustin, Marina Toplak, Katharina Fuchs, Eva Christine Gerstmann, Ruth Prassl, Andreas Winkler, Peter Macheroux
The heterodimeric human electron transferring flavoprotein (hETF) transfers electrons from at least thirteen different flavin dehydrogenases to the mitochondrial respiratory chain through a non-covalently bound FAD cofactor. Here, we describe the discovery of an irreversible and pH-dependent oxidation of the 8α-methyl group to 8-formyl-FAD (8f-FAD), which represents a unique chemical modification of a flavin cofactor in the human flavoproteome. Furthermore, a set of hETF variants revealed that several conserved amino acid residues in the FAD binding pocket of electron transferring flavoproteins are required for the conversion to the formyl group...
January 4, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29301859/parl-partitions-the-lipid-transfer-protein-stard7-between-the-cytosol-and-mitochondria
#12
Shotaro Saita, Takashi Tatsuta, Philipp A Lampe, Tim König, Yohsuke Ohba, Thomas Langer
Intramembrane-cleaving peptidases of the rhomboid family regulate diverse cellular processes that are critical for development and cell survival. The function of the rhomboid protease PARL in the mitochondrial inner membrane has been linked to mitophagy and apoptosis, but other regulatory functions are likely to exist. Here, we identify the START domain-containing protein STARD7 as an intramitochondrial lipid transfer protein for phosphatidylcholine. We demonstrate that PARL-mediated cleavage during mitochondrial import partitions STARD7 to the cytosol and the mitochondrial intermembrane space...
January 4, 2018: EMBO Journal
https://www.readbyqxmd.com/read/29298674/immunepotent-crp-induces-cell-cycle-arrest-and-caspase-independent-regulated-cell-death-in-hela-cells-through-reactive-oxygen-species-production
#13
Ana Carolina Martínez-Torres, Alejandra Reyes-Ruiz, Milena Benítez-Londoño, Moises Armides Franco-Molina, Cristina Rodríguez-Padilla
BACKGROUND: Regulated cell death (RCD) is a mechanism by which the cell activates its own machinery to self-destruct. RCD is important for the maintenance of tissue homeostasis and its deregulation is involved in diseases such as cervical cancer. IMMUNEPOTENT CRP (I-CRP) is a dialyzable bovine leukocyte extract that contains transfer factors and acts as an immunomodulator, and can be cytotoxic to cancer cell lines and reduce tumor burden in vivo. Although I-CRP has shown to improve or modulate immune response in inflammation, infectious diseases and cancer, its widespread use has been limited by the absence of conclusive data on the molecular mechanism of its action...
January 3, 2018: BMC Cancer
https://www.readbyqxmd.com/read/29297348/comparative-analysis-of-inverted-repeats-of-polypod-fern-polypodiales-plastomes-reveals-two-hypervariable-regions
#14
Maria D Logacheva, Anastasiya A Krinitsina, Maxim S Belenikin, Kamil Khafizov, Evgenii A Konorov, Sergey V Kuptsov, Anna S Speranskaya
BACKGROUND: Ferns are large and underexplored group of vascular plants (~ 11 thousands species). The genomic data available by now include low coverage nuclear genomes sequences and partial sequences of mitochondrial genomes for six species and several plastid genomes. RESULTS: We characterized plastid genomes of three species of Dryopteris, which is one of the largest fern genera, using sequencing of chloroplast DNA enriched samples and performed comparative analysis with available plastomes of Polypodiales, the most species-rich group of ferns...
December 28, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/29296759/a-specialized-pathway-for-erythroid-iron-delivery-through-lysosomal-trafficking-of-transferrin-receptor-2
#15
Shadi Khalil, Maja Holy, Stephen Grado, Robert Fleming, Ryo Kurita, Yukio Nakamura, Adam Goldfarb
Erythroid progenitors are the largest consumers of iron in the human body. In these cells, a high flux of iron must reach the mitochondrial matrix to form sufficient heme to support hemoglobinization. Canonical erythroid iron trafficking occurs via the first transferrin receptor (TfR1)-mediated endocytosis of diferric-transferrin into recycling endosomes, where ferric iron is released, reduced, and exported to the cytosol via DMT1. However, mice lacking TfR1 or DMT1 demonstrate residual erythropoiesis, suggesting additional pathways for iron use...
June 27, 2017: Blood Advances
https://www.readbyqxmd.com/read/29291068/phylogeny-of-anophelinae-using-mitochondrial-protein-coding-genes
#16
Peter G Foster, Tatiane Marques Porangaba de Oliveira, Eduardo S Bergo, Jan E Conn, Denise Cristina Sant'Ana, Sandra Sayuri Nagaki, Silvio Nihei, Carlos Einicker Lamas, Christian González, Caio Cesar Moreira, Maria Anice Mureb Sallum
Malaria is a vector-borne disease that is a great burden on the poorest and most marginalized communities of the tropical and subtropical world. Approximately 41 species of Anopheline mosquitoes can effectively spread species of Plasmodium parasites that cause human malaria. Proposing a natural classification for the subfamily Anophelinae has been a continuous effort, addressed using both morphology and DNA sequence data. The monophyly of the genus Anopheles, and phylogenetic placement of the genus Bironella, subgenera Kerteszia, Lophopodomyia and Stethomyia within the subfamily Anophelinae, remain in question...
November 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29287955/remodeling-of-ca2-signaling-in-cancer-regulation-of-inositol-1-4-5-trisphosphate-receptors-through-oncogenes-and-tumor-suppressors
#17
REVIEW
Hideaki Ando, Katsuhiro Kawaai, Benjamin Bonneau, Katsuhiko Mikoshiba
The calcium ion (Ca2+) is a ubiquitous intracellular signaling molecule that regulates diverse physiological and pathological processes, including cancer. Increasing evidence indicates that oncogenes and tumor suppressors regulate the Ca2+ transport systems. Inositol 1,4,5-trisphosphate (IP3) receptors (IP3Rs) are IP3-activated Ca2+ release channels located on the endoplasmic reticulum (ER). They play pivotal roles in the regulation of cell death and survival by controlling Ca2+ transfer from the ER to mitochondria through mitochondria-associated ER membranes (MAMs)...
December 20, 2017: Advances in Biological Regulation
https://www.readbyqxmd.com/read/29280363/integrative-taxonomy-of-leptonetela-spiders-araneae-leptonetidae-with-descriptions-of-46-new-species
#18
Chun-Xia Wang, Xin Xu, Shu-Qiang Li
Extreme environments, such as subterranean habitats, are suspected to be responsible for morphologically inseparable cryptic or sibling species and can bias biodiversity assessment. A DNA barcode is a short, standardized DNA sequence used for taxonomic purposes and has the potential to lessen the challenges presented by a biotic inventory. Here, we investigate the diversity of the genus Leptonetela Kratochvíl, 1978 that is endemic to karst systems in Eurasia using DNA barcoding. We analyzed 624 specimens using one mitochondrial gene fragment (COI)...
November 18, 2017: Zoological Research
https://www.readbyqxmd.com/read/29279306/structure-function-insights-into-direct-lipid-transfer-between-membranes-by-mmm1-mdm12-of-ermes
#19
Shin Kawano, Yasushi Tamura, Rieko Kojima, Siqin Bala, Eri Asai, Agnès H Michel, Benoît Kornmann, Isabelle Riezman, Howard Riezman, Yoshitake Sakae, Yuko Okamoto, Toshiya Endo
The endoplasmic reticulum (ER)-mitochondrial encounter structure (ERMES) physically links the membranes of the ER and mitochondria in yeast. Although the ER and mitochondria cooperate to synthesize glycerophospholipids, whether ERMES directly facilitates the lipid exchange between the two organelles remains controversial. Here, we compared the x-ray structures of an ERMES subunit Mdm12 from Kluyveromyces lactis with that of Mdm12 from Saccharomyces cerevisiae and found that both Mdm12 proteins possess a hydrophobic pocket for phospholipid binding...
December 26, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/29277086/the-challenges-of-integrating-two-genomes-in-one-cell
#20
REVIEW
Erik Hagström, Siv Ge Andersson
Mutualistic bacteria and mitochondria have small genomes that harbor host-essential genes. A major question is why a distinct bacterial or mitochondrial genome is needed to encode these functions. The dual location of genes demand two sets of information processing systems, coordination of gene expression and elaborate transport systems. A simpler solution would be to harbor all genes in a single genome. Functional gene transfers to the host nuclear genome is uncommon in mutualistic bacteria and lost gene functions are rather rescued by co-symbiotic bacteria...
December 22, 2017: Current Opinion in Microbiology
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