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https://www.readbyqxmd.com/read/28108469/blood-rna-biomarkers-in-prodromal-park4-and-rem-sleep-behavior-disorder-show-role-of-complexin-1-loss-for-risk-of-parkinson-s-disease
#1
Suna Lahut, Suzana Gispert, Özgür Ömür, Candan Depboylu, Kay Seidel, Jorge Antolio Domínguez-Bautista, Nadine Brehm, Hülya Tireli, Karl Hackmann, Caroline Pirkevi, Barbara Leube, Vincent Ries, Kerstin Reim, Nils Brose, Wilfred F den Dunnen, Madrid Johnson, Zsuzsanna Wolf, Marc Schindewolf, Wiebke Schrempf, Kathrin Reetz, Peter Young, David Vadasz, Achilleas S Frangakis, Evelin Schröck, Helmuth Steinmetz, Marina Jendrach, Udo Rüb, Ayşe Nazlı Başak, Wolfgang Oertel, Georg Auburger
Parkinson's disease (PD) is a frequent neurodegenerative process at old age. Accumulation and aggregation of the lipid-binding SNARE complex component alpha-synuclein (SNCA) underlies this vulnerability and defines stages of disease progression. Determinants of SNCA levels and mechanisms of SNCA neurotoxicity are intensely investigated. In view of physiological SNCA roles in blood to modulate vesicle release, we studied blood samples from a new large pedigree with SNCA gene duplication (PARK4 mutation), to identify effects of SNCA gain-of-function as potential disease biomarkers...
January 20, 2017: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/28107777/the-dc1-domain-protein-vacuoleless-gametophytes-is-essential-for-female-and-male-gametophyte-development-in-arabidopsis
#2
Sebastián D'Ippólito, Leonardo Agustín Arias, Claudia Anahí Casalongué, Gabriela Carolina Pagnussat, Diego Fernando Fiol
In this work we identified VACUOLELESS GAMETOPHYTES (VLG) as a DC1 domain containing protein present in the endomembrane system essential for both female and male gametophyte development. VLG was originally annotated as a gene coding for an unknown function protein containing DC1 domains. DC1 domains are cysteine and histidine -rich zinc finger domains found exclusively in the plant Kingdom that have been named based on its similarity with the C1 domain present in protein kinase C (PKC). In Arabidopsis, both male and female gametophytes are characterized by the formation of a big vacuole early in development, which is absent in vlg mutant plants...
January 20, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28104350/neonatal-exposure-to-bde-209-impaired-learning-and-memory-decreased-expression-of-hippocampal-core-snares-and-synaptophysin-in-adult-rats
#3
Xiong Li, Chunmei Wang, Wen Wang, Chengwei Yue, Yan Tang
Polybrominated diphenyl ethers (PBDEs) are a class of flame retardants. While the mechanism remains unknown, the potential neurotoxic effects of PBDEs remain a relevant issue. In the present study, neonatal Sprague-Dawley rats of both sexes were administered BDE 209 (1, 10, or 20mg/kg body weight) or peanut oil once daily from postnatal day (PND) 5 to PND 10. We examined the spatial learning and memory by Morris water maze and the working and reference memory by eight-arm radial maze in the stage of adulthood...
January 16, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28101746/music-preferences-friendship-and-externalizing-behavior-in-early-adolescence-a-siena-examination-of-the-music-marker-theory-using-the-snare-study
#4
Aart Franken, Loes Keijsers, Jan Kornelis Dijkstra, Tom Ter Bogt
Music Marker Theory posits that music is relevant for the structuring of peer groups and that rock, urban, or dance music preferences relate to externalizing behavior. The present study tested these hypotheses, by investigating the role of music preference similarity in friendship selection and the development of externalizing behavior, while taking the effects of friends' externalizing behavior into account. Data were used from the first three waves of the SNARE (Social Network Analysis of Risk behavior in Early adolescence) study (N = 1144; 50% boys; M age = 12...
January 18, 2017: Journal of Youth and Adolescence
https://www.readbyqxmd.com/read/28101361/bronchoscopic-resection-of-bronchial-angiolipoma-a-rare-case-report
#5
Zhiqiang Wu, Hongli Wan, Min Shi, Ming Li, Zhanpeng Wang, Caixia Yang, Wei Gao, Qingxin Li
Angiolipoma is a rare benign tumor that most commonly occurs in the extremities and trunk. Angiolipomas originating in the bronchial tree are extremely rare. To the best of our knowledge, only one such case, confined to the bronchus intermedius, has been reported to date. The present study describes the case of an asymptomatic 74-year-old man with a yellowish round mass incidentally discovered at the orifice of the right lower bronchus during a routine health check. The tumor originated from the membranous part of the right inferior bronchus...
December 2016: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/28100639/munc13-4-functions-as-a-ca2-sensor-for-homotypic-secretory-granule-fusion-to-generate-endosomal-exocytic-vacuoles
#6
Sang Su Woo, Declan J James, Thomas F J Martin
Munc13-4 is a Ca(2+)-dependent SNARE- and phospholipid-binding protein that localizes to and primes secretory granules (SGs) for Ca(2+)-evoked secretion in various secretory cells. Studies in mast cell-like RBL-2H3 cells provides direct evidence that Munc13-4 with its two Ca(2+)-binding C2 domains functions as a Ca(2+) sensor for SG exocytosis. Unexpectedly, Ca(2+) stimulation also generated large (>2.4 μm diameter) Munc13-4(+)/Rab7(+)/Rab11(+) endosomal vacuoles. Vacuole generation involved the homotypic fusion of Munc13-4(+)/Rab7(+) SGs followed by a merge with Rab11(+) endosomes, and depended on Ca(2+) binding to Munc13-4...
January 18, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28099364/endoscopic-retrieval-of-gastric-trichophytobezoar-case-report-of-a-12-year-old-girl-with-trichophagia
#7
Jiu-Ling Zhao, Wei-Chuan Zhao, Yu-Shui Wang
RATIONALE: Trichophytobezoars, which are composed of hair and plant fibers, are usually located in the stomach. They are often associated with trichophagia and trichotillomania. The most commonly reported methods of trichophytobezoar treatment are open surgery and laparoscopic retrieval; there are few reports of endoscopic removal of trichophytobezoars. PATIENT CONCERNS AND DIAGNOSES: Twelve-year-old girl presented with a 3-day history of increasing upper abdominal pain, anorexia, and postprandial emesis...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28097727/energetics-kinetics-and-pathway-of-snare-folding-and-assembly-revealed-by-optical-tweezers
#8
REVIEW
Yongli Zhang
Soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) are universal molecular engines that drive membrane fusion. Particularly, synaptic SNAREs mediate fast calcium-triggered fusion of neurotransmitter-containing vesicles with plasma membranes for synaptic transmission, the basis of all thought and action. During membrane fusion, complementary SNAREs located on two apposed membranes (often called t- and v-SNAREs) join together to assemble into a parallel four-helix bundle, releasing the energy to overcome the energy barrier for fusion...
January 18, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28096354/loss-of-get-pathway-orthologs-in-arabidopsis-thaliana-causes-root-hair-growth-defects-and-affects-snare-abundance
#9
Shuping Xing, Dietmar Gerald Mehlhorn, Niklas Wallmeroth, Lisa Yasmin Asseck, Ritwika Kar, Alessa Voss, Philipp Denninger, Vanessa Aphaia Fiona Schmidt, Markus Schwarzländer, York-Dieter Stierhof, Guido Grossmann, Christopher Grefen
Soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) proteins are key players in cellular trafficking and coordinate vital cellular processes, such as cytokinesis, pathogen defense, and ion transport regulation. With few exceptions, SNAREs are tail-anchored (TA) proteins, bearing a C-terminal hydrophobic domain that is essential for their membrane integration. Recently, the Guided Entry of Tail-anchored proteins (GET) pathway was described in mammalian and yeast cells that serve as a blueprint of TA protein insertion [Schuldiner M, et al...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28089515/navigation-through-the-plasma-membrane-molecular-landscape-shapes-random-organelle-movement
#10
Alison R Dun, Gabriel J Lord, Rhodri S Wilson, Deirdre M Kavanagh, Katarzyna I Cialowicz, Shuzo Sugita, Seungmee Park, Lei Yang, Annya M Smyth, Andreas Papadopulos, Colin Rickman, Rory R Duncan
Eukaryotic plasma membrane organization theory has long been controversial, in part due to a dearth of suitably high-resolution techniques to probe molecular architecture in situ and integrate information from diverse data streams [1]. Notably, clustered patterning of membrane proteins is a commonly conserved feature across diverse protein families (reviewed in [2]), including the SNAREs [3], SM proteins [4, 5], ion channels [6, 7], and receptors (e.g., [8]). Much effort has gone into analyzing the behavior of secretory organelles [9-13], and understanding the relationship between the membrane and proximal organelles [4, 5, 12, 14] is an essential goal for cell biology as broad concepts or rules may be established...
January 9, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28077717/complexin-mutants-reveal-partial-segregation-between-recycling-pathways-that-drive-evoked-and-spontaneous-neurotransmission
#11
Nadezhda Sabeva, Richard W Cho, Alexander Vasin, Agustin Gonzalez, J Troy Littleton, Maria Bykhovskaia
: Synaptic vesicles fuse at morphological specializations in the presynaptic terminal termed active zones (AZs). Vesicle fusion can occur spontaneously or in response to an action potential. Following fusion, vesicles are retrieved and recycled within nerve terminals. It is still unclear whether vesicles that fuse spontaneously or following evoked release share similar recycling mechanisms. Genetic deletion of the SNARE-binding protein complexin dramatically increases spontaneous fusion, with the protein serving as the synaptic vesicle fusion clamp at Drosophila synapses...
January 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28068700/anchoring-the-snare-tip-by-means-of-a-small-incision-facilitates-en-bloc-endoscopic-mucosal-resection-and-increases-the-specimen-size
#12
Jérémie Jacques, Romain Legros, Aurélie Charissoux, Jérôme Rivory, Thierry Ponchon, Denis Sautereau, Mathieu Pioche
No abstract text is available yet for this article.
February 2017: Endoscopy
https://www.readbyqxmd.com/read/28067230/pyruvate-kinase-type-m2-promotes-tumour-cell-exosome-release-via-phosphorylating-synaptosome-associated-protein-23
#13
Yao Wei, Dong Wang, Fangfang Jin, Zhen Bian, Limin Li, Hongwei Liang, Mingzhen Li, Lei Shi, Chaoyun Pan, Dihan Zhu, Xi Chen, Gang Hu, Yuan Liu, Chen-Yu Zhang, Ke Zen
Tumour cells secrete exosomes that are involved in the remodelling of the tumour-stromal environment and promoting malignancy. The mechanisms governing tumour exosome release, however, remain incompletely understood. Here we show that tumour cell exosomes secretion is controlled by pyruvate kinase type M2 (PKM2), which is upregulated and phosphorylated in tumours. During exosome secretion, phosphorylated PKM2 serves as a protein kinase to phosphorylate synaptosome-associated protein 23 (SNAP-23), which in turn enables the formation of the SNARE complex to allow exosomes release...
January 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28065740/bacterial-signaling-to-the-nervous-system-via-toxins-and-metabolites
#14
REVIEW
Nicole J Yang, Isaac M Chiu
Mammalian hosts interface intimately with commensal and pathogenic bacteria. It is increasingly clear that molecular interactions between the nervous system and microbes contribute to health and disease. Both commensal and pathogenic bacteria are capable of producing molecules that act on neurons and affect essential aspects of host physiology. Here we highlight several classes of physiologically important molecular interactions that occur between bacteria and the nervous system. First, clostridial neurotoxins block neurotransmission to or from neurons by targeting the SNARE complex, causing the characteristic paralyses of botulism and tetanus during bacterial infection...
January 5, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28062852/a-proteomic-approach-to-identify-endosomal-cargoes-controlling-cancer-invasiveness
#15
Jesica Diaz-Vera, Sarah Palmer, Juan Ramon Hernandez-Fernaud, Emmanuel Dornier, Louise E Mitchell, Iain Macpherson, Joanne Edwards, Sara Zanivan, Jim C Norman
We have previously shown that Rab17 - a small GTPase associated with epithelial polarity - is specifically suppressed by ERK2 signalling to promote an invasive phenotype. However, the mechanisms through which Rab17 loss permits invasiveness, and the endosomal cargoes that are responsible for mediating this are not known. Using quantitative mass spectrometry-based proteomics, we have found that knockdown of Rab17 leads to highly selective reduction in the cellular levels of a v-SNARE (Vamp8). Moreover, proteomics and immunofluorescence indicate that Vamp-8 is associated with Rab17 at late endosomes...
January 6, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28058702/percutaneous-retrieval-of-a-fractured-dialysis-catheter-using-a-balloon
#16
Su Nam Lee, Min Seop Jo, Ki-Dong Yoo
Intravascular foreign bodies can cause serious complications and catheter fracture with or without embolization is a rare, serious event. Intravascular fragments from broken catheters can be retrieved percutaneously or surgically, and should be removed as soon as possible to prevent further lethal complications. A gooseneck loop snare is the most popular device for endovascular retrieval of intravascular foreign bodies. Herein, we present the first report of successful percutaneous retrieval of a fractured catheter using a balloon...
January 3, 2017: Journal of Vascular Access
https://www.readbyqxmd.com/read/28058080/cecal-leiomyoma-can-we-attempt-endoscopic-resection
#17
Kanthi Rekha Badipatla, Chandana Kamireddy, Masooma Niazi, Suresh Kumar Nayudu
Gastrointestinal leiomyomas are smooth muscle tumors arising from the muscularis mucosae, muscularis propriae and possibly from smooth muscle of the vessel wall. Management depends on the size, location and the clinical scenario. Endoscopic snare cauterization with or without saline lift has been described in literature for tumors involving the left colon. To the best of our knowledge, endoscopic resection of right colon leiomyoma was never attempted in the past. We present a case of cecal leiomyoma which was resected endoscopically...
December 2016: Gastroenterology Research
https://www.readbyqxmd.com/read/28057922/membrane-translocation-of-t-snare-protein-syntaxin-4-abrogates-ground-state-pluripotency-in-mouse-embryonic-stem-cells
#18
Natsumi Hagiwara-Chatani, Kota Shirai, Takumi Kido, Tomoatsu Horigome, Akihiro Yasue, Naoki Adachi, Yohei Hirai
Embryonic stem (ES) and induced pluripotent stem (iPS) cells are attractive tools for regenerative medicine therapies. However, aberrant cell populations that display flattened morphology and lose ground-state pluripotency often appear spontaneously, unless glycogen synthase kinase 3β (GSK3β) and mitogen-activated protein kinase kinase (MEK1/2) are inactivated. Here, we show that membrane translocation of the t-SNARE protein syntaxin-4 possibly is involved in this phenomenon. We found that mouse ES cells cultured without GSK3β/MEK1/2 inhibitors (2i) spontaneously extrude syntaxin-4 at the cell surface and that artificial expression of cell surface syntaxin-4 induces appreciable morphological changes and mesodermal differentiation through dephosphorylation of Akt...
January 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28045419/successful-percutaneous-removal-of-broken-umbilical-vein-catheter-in-a-very-low-birth-weight-preterm-infant
#19
Atalay Demirel, Gülşah Güven, Füsun Okan, Arda Saygılı
A 28-week-old preterm infant with a birth weight of 1250 g had a broken segment of umbilical vein catheter (UVC) lodged in the right atrium. It was observed that a 7-cm fragment of catheter had migrated to the right atrium through the inferior vena cava. The catheter was successfully retrieved by fluoroscopically guided percutaneous cardiac catheterization, using a cobra catheter and snare wire, without complication. Fracture and embolization of UVC is a rare but serious complication. Presently described was a case of fractured and embolized UVC in a very low-birth-weight preterm infant, and its successful retrieval via percutaneous endovascular approach...
December 2016: Türk Kardiyoloji Derneği Arşivi: Türk Kardiyoloji Derneğinin Yayın Organıdır
https://www.readbyqxmd.com/read/28045048/in-vivo-single-molecule-imaging-of-syntaxin1a-reveals-polyphosphoinositide-and-activity-dependent-trapping-in-presynaptic-nanoclusters
#20
Adekunle T Bademosi, Elsa Lauwers, Pranesh Padmanabhan, Lorenzo Odierna, Ye Jin Chai, Andreas Papadopulos, Geoffrey J Goodhill, Patrik Verstreken, Bruno van Swinderen, Frédéric A Meunier
Syntaxin1A is organized in nanoclusters that are critical for the docking and priming of secretory vesicles from neurosecretory cells. Whether and how these nanoclusters are affected by neurotransmitter release in nerve terminals from a living organism is unknown. Here we imaged photoconvertible syntaxin1A-mEos2 in the motor nerve terminal of Drosophila larvae by single-particle tracking photoactivation localization microscopy. Opto- and thermo-genetic neuronal stimulation increased syntaxin1A-mEos2 mobility, and reduced the size and molecular density of nanoclusters, suggesting an activity-dependent release of syntaxin1A from the confinement of nanoclusters...
January 3, 2017: Nature Communications
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