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  • 1
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    BAX activation is initiated at a novel interaction site (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-10-25
    Description: BAX is a pro-apoptotic protein of the BCL-2 family that is stationed in the cytosol until activated by a diversity of stress stimuli to induce cell death. Anti-apoptotic proteins such as BCL-2 counteract BAX-mediated cell death. Although an interaction site that confers survival functionality has been defined for anti-apoptotic proteins, an activation site has not been identified for BAX, rendering its explicit trigger mechanism unknown. We previously developed stabilized alpha-helix of BCL-2 domains (SAHBs) that directly initiate BAX-mediated mitochondrial apoptosis. Here we demonstrate by NMR analysis that BIM SAHB binds BAX at an interaction site that is distinct from the canonical binding groove characterized for anti-apoptotic proteins. The specificity of the human BIM-SAHB-BAX interaction is highlighted by point mutagenesis that disrupts functional activity, confirming that BAX activation is initiated at this novel structural location. Thus, we have now defined a BAX interaction site for direct activation, establishing a new target for therapeutic modulation of apoptosis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2597110/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2597110/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gavathiotis, Evripidis -- Suzuki, Motoshi -- Davis, Marguerite L -- Pitter, Kenneth -- Bird, Gregory H -- Katz, Samuel G -- Tu, Ho-Chou -- Kim, Hyungjin -- Cheng, Emily H-Y -- Tjandra, Nico -- Walensky, Loren D -- 5P01CA92625/CA/NCI NIH HHS/ -- 5R01CA125562/CA/NCI NIH HHS/ -- 5R01CA50239/CA/NCI NIH HHS/ -- K99 HL095929/HL/NHLBI NIH HHS/ -- K99 HL095929-01A1/HL/NHLBI NIH HHS/ -- K99 HL095929-02/HL/NHLBI NIH HHS/ -- R00 HL095929/HL/NHLBI NIH HHS/ -- R01 CA050239/CA/NCI NIH HHS/ -- R01 CA125562/CA/NCI NIH HHS/ -- R01 CA125562-02/CA/NCI NIH HHS/ -- Intramural NIH HHS/ -- England -- Nature. 2008 Oct 23;455(7216):1076-81. doi: 10.1038/nature07396.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pediatric Oncology and the Program in Cancer Chemical Biology, Dana-Farber Cancer Institute, 44 Binney Street, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18948948" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Apoptosis ; Apoptosis Regulatory Proteins/chemistry/metabolism ; BH3 Interacting Domain Death Agonist Protein/metabolism ; Cell Line ; *Gene Expression Regulation ; Humans ; Membrane Proteins/chemistry/metabolism ; Mice ; Mutagenesis, Site-Directed ; Mutation/genetics ; Nuclear Magnetic Resonance, Biomolecular ; Protein Binding ; Proto-Oncogene Proteins/chemistry/metabolism ; Sequence Alignment ; bcl-2-Associated X Protein/chemistry/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
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    Neural palmitoyl-proteomics reveals dynamic synaptic palmitoylation (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-12-19
    Description: Palmitoylation regulates diverse aspects of neuronal protein trafficking and function. Here a global characterization of rat neural palmitoyl-proteomes identifies most of the known neural palmitoyl proteins-68 in total, plus more than 200 new palmitoyl-protein candidates, with further testing confirming palmitoylation for 21 of these candidates. The new palmitoyl proteins include neurotransmitter receptors, transporters, adhesion molecules, scaffolding proteins, as well as SNAREs and other vesicular trafficking proteins. Of particular interest is the finding of palmitoylation for a brain-specific Cdc42 splice variant. The palmitoylated Cdc42 isoform (Cdc42-palm) differs from the canonical, prenylated form (Cdc42-prenyl), both with regard to localization and function: Cdc42-palm concentrates in dendritic spines and has a special role in inducing these post-synaptic structures. Furthermore, assessing palmitoylation dynamics in drug-induced activity models identifies rapidly induced changes for Cdc42 as well as for other synaptic palmitoyl proteins, suggesting that palmitoylation may participate broadly in the activity-driven changes that shape synapse morphology and function.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2610860/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2610860/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kang, Rujun -- Wan, Junmei -- Arstikaitis, Pamela -- Takahashi, Hideto -- Huang, Kun -- Bailey, Aaron O -- Thompson, James X -- Roth, Amy F -- Drisdel, Renaldo C -- Mastro, Ryan -- Green, William N -- Yates, John R 3rd -- Davis, Nicholas G -- El-Husseini, Alaa -- DA019695/DA/NIDA NIH HHS/ -- DA13602/DA/NIDA NIH HHS/ -- GM65525/GM/NIGMS NIH HHS/ -- NS043782/NS/NINDS NIH HHS/ -- P01 DA019695/DA/NIDA NIH HHS/ -- P01 DA019695-01A20001/DA/NIDA NIH HHS/ -- P01 DA019695-020001/DA/NIDA NIH HHS/ -- R01 DA013602/DA/NIDA NIH HHS/ -- R01 DA013602-01/DA/NIDA NIH HHS/ -- R01 DA013602-02/DA/NIDA NIH HHS/ -- R01 DA013602-02S1/DA/NIDA NIH HHS/ -- R01 DA013602-02S2/DA/NIDA NIH HHS/ -- R01 DA013602-03/DA/NIDA NIH HHS/ -- R01 DA013602-04/DA/NIDA NIH HHS/ -- R01 DA013602-05/DA/NIDA NIH HHS/ -- R01 NS032693/NS/NINDS NIH HHS/ -- R01 NS032693-08/NS/NINDS NIH HHS/ -- R01 NS043782/NS/NINDS NIH HHS/ -- R01 NS043782-01A2/NS/NINDS NIH HHS/ -- R01 NS043782-02/NS/NINDS NIH HHS/ -- R01 NS043782-03/NS/NINDS NIH HHS/ -- R01 NS043782-04/NS/NINDS NIH HHS/ -- R01 NS043782-05/NS/NINDS NIH HHS/ -- R56 NS043782/NS/NINDS NIH HHS/ -- R56 NS043782-06/NS/NINDS NIH HHS/ -- RR011823/RR/NCRR NIH HHS/ -- England -- Nature. 2008 Dec 18;456(7224):904-9. doi: 10.1038/nature07605.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychiatry, Brain Research Centre, University of British Columbia, Vancouver V6T 1Z3, British Columbia, Canada. rkang@interchange.ubc.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19092927" target="_blank"〉PubMed〈/a〉
    Keywords: Alternative Splicing/genetics ; Animals ; Cells, Cultured ; Cerebral Cortex/cytology/embryology ; Dendrites/metabolism ; *Lipoylation ; Models, Neurological ; Neurons/*metabolism ; Organ Specificity ; Proteome/metabolism ; *Proteomics ; Rats ; Synapses/*metabolism ; cdc42 GTP-Binding Protein/genetics/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
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    The genome of the model beetle and pest Tribolium castaneum (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-03-26
    Description: Tribolium castaneum is a member of the most species-rich eukaryotic order, a powerful model organism for the study of generalized insect development, and an important pest of stored agricultural products. We describe its genome sequence here. This omnivorous beetle has evolved the ability to interact with a diverse chemical environment, as shown by large expansions in odorant and gustatory receptors, as well as P450 and other detoxification enzymes. Development in Tribolium is more representative of other insects than is Drosophila, a fact reflected in gene content and function. For example, Tribolium has retained more ancestral genes involved in cell-cell communication than Drosophila, some being expressed in the growth zone crucial for axial elongation in short-germ development. Systemic RNA interference in T. castaneum functions differently from that in Caenorhabditis elegans, but nevertheless offers similar power for the elucidation of gene function and identification of targets for selective insect control.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tribolium Genome Sequencing Consortium -- Richards, Stephen -- Gibbs, Richard A -- Weinstock, George M -- Brown, Susan J -- Denell, Robin -- Beeman, Richard W -- Gibbs, Richard -- Bucher, Gregor -- Friedrich, Markus -- Grimmelikhuijzen, Cornelis J P -- Klingler, Martin -- Lorenzen, Marce -- Roth, Siegfried -- Schroder, Reinhard -- Tautz, Diethard -- Zdobnov, Evgeny M -- Muzny, Donna -- Attaway, Tony -- Bell, Stephanie -- Buhay, Christian J -- Chandrabose, Mimi N -- Chavez, Dean -- Clerk-Blankenburg, Kerstin P -- Cree, Andrew -- Dao, Marvin -- Davis, Clay -- Chacko, Joseph -- Dinh, Huyen -- Dugan-Rocha, Shannon -- Fowler, Gerald -- Garner, Toni T -- Garnes, Jeffrey -- Gnirke, Andreas -- Hawes, Alica -- Hernandez, Judith -- Hines, Sandra -- Holder, Michael -- Hume, Jennifer -- Jhangiani, Shalini N -- Joshi, Vandita -- Khan, Ziad Mohid -- Jackson, LaRonda -- Kovar, Christie -- Kowis, Andrea -- Lee, Sandra -- Lewis, Lora R -- Margolis, Jon -- Morgan, Margaret -- Nazareth, Lynne V -- Nguyen, Ngoc -- Okwuonu, Geoffrey -- Parker, David -- Ruiz, San-Juana -- Santibanez, Jireh -- Savard, Joel -- Scherer, Steven E -- Schneider, Brian -- Sodergren, Erica -- Vattahil, Selina -- Villasana, Donna -- White, Courtney S -- Wright, Rita -- Park, Yoonseong -- Lord, Jeff -- Oppert, Brenda -- Brown, Susan -- Wang, Liangjiang -- Weinstock, George -- Liu, Yue -- Worley, Kim -- Elsik, Christine G -- Reese, Justin T -- Elhaik, Eran -- Landan, Giddy -- Graur, Dan -- Arensburger, Peter -- Atkinson, Peter -- Beidler, Jim -- Demuth, Jeffery P -- Drury, Douglas W -- Du, Yu-Zhou -- Fujiwara, Haruhiko -- Maselli, Vincenza -- Osanai, Mizuko -- Robertson, Hugh M -- Tu, Zhijian -- Wang, Jian-jun -- Wang, Suzhi -- Song, Henry -- Zhang, Lan -- Werner, Doreen -- Stanke, Mario -- Morgenstern, Burkhard -- Solovyev, Victor -- Kosarev, Peter -- Brown, Garth -- Chen, Hsiu-Chuan -- Ermolaeva, Olga -- Hlavina, Wratko -- Kapustin, Yuri -- Kiryutin, Boris -- Kitts, Paul -- Maglott, Donna -- Pruitt, Kim -- Sapojnikov, Victor -- Souvorov, Alexandre -- Mackey, Aaron J -- Waterhouse, Robert M -- Wyder, Stefan -- Kriventseva, Evgenia V -- Kadowaki, Tatsuhiko -- Bork, Peer -- Aranda, Manuel -- Bao, Riyue -- Beermann, Anke -- Berns, Nicola -- Bolognesi, Renata -- Bonneton, Francois -- Bopp, Daniel -- Butts, Thomas -- Chaumot, Arnaud -- Denell, Robin E -- Ferrier, David E K -- Gordon, Cassondra M -- Jindra, Marek -- Lan, Que -- Lattorff, H Michael G -- Laudet, Vincent -- von Levetsow, Cornelia -- Liu, Zhenyi -- Lutz, Rebekka -- Lynch, Jeremy A -- da Fonseca, Rodrigo Nunes -- Posnien, Nico -- Reuter, Rolf -- Schinko, Johannes B -- Schmitt, Christian -- Schoppmeier, Michael -- Shippy, Teresa D -- Simonnet, Franck -- Marques-Souza, Henrique -- Tomoyasu, Yoshinori -- Trauner, Jochen -- Van der Zee, Maurijn -- Vervoort, Michel -- Wittkopp, Nadine -- Wimmer, Ernst A -- Yang, Xiaoyun -- Jones, Andrew K -- Sattelle, David B -- Ebert, Paul R -- Nelson, David -- Scott, Jeffrey G -- Muthukrishnan, Subbaratnam -- Kramer, Karl J -- Arakane, Yasuyuki -- Zhu, Qingsong -- Hogenkamp, David -- Dixit, Radhika -- Jiang, Haobo -- Zou, Zhen -- Marshall, Jeremy -- Elpidina, Elena -- Vinokurov, Konstantin -- Oppert, Cris -- Evans, Jay -- Lu, Zhiqiang -- Zhao, Picheng -- Sumathipala, Niranji -- Altincicek, Boran -- Vilcinskas, Andreas -- Williams, Michael -- Hultmark, Dan -- Hetru, Charles -- Hauser, Frank -- Cazzamali, Giuseppe -- Williamson, Michael -- Li, Bin -- Tanaka, Yoshiaki -- Predel, Reinhard -- Neupert, Susanne -- Schachtner, Joachim -- Verleyen, Peter -- Raible, Florian -- Walden, Kimberly K O -- Angeli, Sergio -- Foret, Sylvain -- Schuetz, Stefan -- Maleszka, Ryszard -- Miller, Sherry C -- Grossmann, Daniela -- BBS/B/12067/Biotechnology and Biological Sciences Research Council/United Kingdom -- BBS/B/12067/2/Biotechnology and Biological Sciences Research Council/United Kingdom -- R01 GM058634/GM/NIGMS NIH HHS/ -- R01 HD029594/HD/NICHD NIH HHS/ -- R01 HD029594-16/HD/NICHD NIH HHS/ -- U54 HG003273/HG/NHGRI NIH HHS/ -- Intramural NIH HHS/ -- England -- Nature. 2008 Apr 24;452(7190):949-55. doi: 10.1038/nature06784. Epub 2008 Mar 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Human Genome Sequencing Center, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA. stephenr@bcm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18362917" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Composition ; Body Patterning/genetics ; Cytochrome P-450 Enzyme System/genetics ; DNA Transposable Elements/genetics ; Genes, Insect/*genetics ; Genome, Insect/*genetics ; Growth and Development/genetics ; Humans ; Insecticides/pharmacology ; Neurotransmitter Agents/genetics ; Oogenesis/genetics ; Phylogeny ; Proteome/genetics ; RNA Interference ; Receptors, G-Protein-Coupled/genetics ; Receptors, Odorant/genetics ; Repetitive Sequences, Nucleic Acid/genetics ; Taste/genetics ; Telomere/genetics ; Tribolium/classification/embryology/*genetics/physiology ; Vision, Ocular/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
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    SMAD proteins control DROSHA-mediated microRNA maturation (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-06-13
    Description: MicroRNAs (miRNAs) are small non-coding RNAs that participate in the spatiotemporal regulation of messenger RNA and protein synthesis. Aberrant miRNA expression leads to developmental abnormalities and diseases, such as cardiovascular disorders and cancer; however, the stimuli and processes regulating miRNA biogenesis are largely unknown. The transforming growth factor beta (TGF-beta) and bone morphogenetic protein (BMP) family of growth factors orchestrates fundamental biological processes in development and in the homeostasis of adult tissues, including the vasculature. Here we show that induction of a contractile phenotype in human vascular smooth muscle cells by TGF-beta and BMPs is mediated by miR-21. miR-21 downregulates PDCD4 (programmed cell death 4), which in turn acts as a negative regulator of smooth muscle contractile genes. Surprisingly, TGF-beta and BMP signalling promotes a rapid increase in expression of mature miR-21 through a post-transcriptional step, promoting the processing of primary transcripts of miR-21 (pri-miR-21) into precursor miR-21 (pre-miR-21) by the DROSHA (also known as RNASEN) complex. TGF-beta- and BMP-specific SMAD signal transducers are recruited to pri-miR-21 in a complex with the RNA helicase p68 (also known as DDX5), a component of the DROSHA microprocessor complex. The shared cofactor SMAD4 is not required for this process. Thus, regulation of miRNA biogenesis by ligand-specific SMAD proteins is critical for control of the vascular smooth muscle cell phenotype and potentially for SMAD4-independent responses mediated by the TGF-beta and BMP signalling pathways.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2653422/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2653422/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, Brandi N -- Hilyard, Aaron C -- Lagna, Giorgio -- Hata, Akiko -- HD042149/HD/NICHD NIH HHS/ -- HL082854/HL/NHLBI NIH HHS/ -- HL086572/HL/NHLBI NIH HHS/ -- R01 HD042149/HD/NICHD NIH HHS/ -- R01 HD042149-05/HD/NICHD NIH HHS/ -- R01 HL082854/HL/NHLBI NIH HHS/ -- R01 HL082854-03/HL/NHLBI NIH HHS/ -- R21 HL086572/HL/NHLBI NIH HHS/ -- R21 HL086572-02/HL/NHLBI NIH HHS/ -- England -- Nature. 2008 Jul 3;454(7200):56-61. doi: 10.1038/nature07086. Epub 2008 Jun 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Tufts University School of Medicine, Boston, Massachusetts 02111, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18548003" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis Regulatory Proteins/metabolism ; Bone Morphogenetic Protein 4 ; Bone Morphogenetic Proteins/metabolism/pharmacology ; Breast Neoplasms/genetics ; Cell Line ; Cercopithecus aethiops ; DEAD-box RNA Helicases/metabolism ; Gene Expression Regulation/drug effects ; Humans ; Ligands ; Mice ; MicroRNAs/biosynthesis/*metabolism ; Muscle, Smooth/metabolism ; Phenotype ; Protein Binding ; *RNA Processing, Post-Transcriptional ; RNA-Binding Proteins/metabolism ; Ribonuclease III/*metabolism ; Signal Transduction/drug effects ; Smad Proteins/*metabolism ; Transforming Growth Factor beta/metabolism/pharmacology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
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    The abundance threshold for plague as a critical percolation phenomenon (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-08-01
    Description: Percolation theory is most commonly associated with the slow flow of liquid through a porous medium, with applications to the physical sciences. Epidemiological applications have been anticipated for disease systems where the host is a plant or volume of soil, and hence is fixed in space. However, no natural examples have been reported. The central question of interest in percolation theory, the possibility of an infinite connected cluster, corresponds in infectious disease to a positive probability of an epidemic. Archived records of plague (infection with Yersinia pestis) in populations of great gerbils (Rhombomys opimus) in Kazakhstan have been used to show that epizootics only occur when more than about 0.33 of the burrow systems built by the host are occupied by family groups. The underlying mechanism for this abundance threshold is unknown. Here we present evidence that it is a percolation threshold, which arises from the difference in scale between the movements that transport infectious fleas between family groups and the vast size of contiguous landscapes colonized by gerbils. Conventional theory predicts that abundance thresholds for the spread of infectious disease arise when transmission between hosts is density dependent such that the basic reproduction number (R(0)) increases with abundance, attaining 1 at the threshold. Percolation thresholds, however, are separate, spatially explicit thresholds that indicate long-range connectivity in a system and do not coincide with R(0) = 1. Abundance thresholds are the theoretical basis for attempts to manage infectious disease by reducing the abundance of susceptibles, including vaccination and the culling of wildlife. This first natural example of a percolation threshold in a disease system invites a re-appraisal of other invasion thresholds, such as those for epidemic viral infections in African lions (Panthera leo), and of other disease systems such as bovine tuberculosis (caused by Mycobacterium bovis) in badgers (Meles meles).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, S -- Trapman, P -- Leirs, H -- Begon, M -- Heesterbeek, J A P -- England -- Nature. 2008 Jul 31;454(7204):634-7. doi: 10.1038/nature07053.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Theoretical Epidemiology, Faculty of Veterinary Medicine, University of Utrecht, Yalelaan 7, 3584 CL Utrecht, The Netherlands. S.A.Davis@uu.nl〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18668107" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Disease Outbreaks ; Gerbillinae/microbiology/parasitology ; Kazakhstan/epidemiology ; *Models, Biological ; Plague/epidemiology/parasitology/*transmission/veterinary ; Population Density ; Population Dynamics ; Rodent Diseases/epidemiology/parasitology/transmission ; Siphonaptera/microbiology/physiology ; Yersinia pestis/*physiology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
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    Impaired T(H)17 cell differentiation in subjects with autosomal dominant hyper-IgE syndrome (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-03-14
    Description: The autosomal dominant hyper-IgE syndrome (HIES, 'Job's syndrome') is characterized by recurrent and often severe pulmonary infections, pneumatoceles, eczema, staphylococcal abscesses, mucocutaneous candidiasis, and abnormalities of bone and connective tissue. Mutations presumed to underlie HIES have recently been identified in stat3, the gene encoding STAT3 (signal transducer and activator of transcription 3) (refs 3, 4). Although impaired production of interferon-gamma and tumour-necrosis factor by T cells, diminished memory T-cell populations, decreased delayed-type-hypersensitivity responses and decreased in vitro lymphoproliferation in response to specific antigens have variably been described, specific immunological abnormalities that can explain the unique susceptibility to particular infections seen in HIES have not yet been defined. Here we show that interleukin (IL)-17 production by T cells is absent in HIES individuals. We observed that ex vivo T cells from subjects with HIES failed to produce IL-17, but not IL-2, tumour-necrosis factor or interferon-gamma, on mitogenic stimulation with staphylococcal enterotoxin B or on antigenic stimulation with Candida albicans or streptokinase. Purified naive T cells were unable to differentiate into IL-17-producing (T(H)17) T helper cells in vitro and had lower expression of retinoid-related orphan receptor (ROR)-gammat, which is consistent with a crucial role for STAT3 signalling in the generation of T(H)17 cells. T(H)17 cells have emerged as an important subset of helper T cells that are believed to be critical in the clearance of fungal and extracellular bacterial infections. Thus, our data suggest that the inability to produce T(H)17 cells is a mechanism underlying the susceptibility to the recurrent infections commonly seen in HIES.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2864108/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2864108/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Milner, Joshua D -- Brenchley, Jason M -- Laurence, Arian -- Freeman, Alexandra F -- Hill, Brenna J -- Elias, Kevin M -- Kanno, Yuka -- Spalding, Christine -- Elloumi, Houda Z -- Paulson, Michelle L -- Davis, Joie -- Hsu, Amy -- Asher, Ava I -- O'Shea, John -- Holland, Steven M -- Paul, William E -- Douek, Daniel C -- Z99 AI999999/Intramural NIH HHS/ -- England -- Nature. 2008 Apr 10;452(7188):773-6. doi: 10.1038/nature06764. Epub 2008 Mar 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Immunology, National Institutes of Health, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18337720" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Candida albicans/immunology ; *Cell Differentiation ; Child ; Child, Preschool ; Enterotoxins/immunology ; Female ; *Genes, Dominant ; Humans ; Interferon-gamma/biosynthesis/immunology ; Interleukin-17/*biosynthesis ; Interleukin-2/biosynthesis/immunology ; Job Syndrome/genetics/*immunology/metabolism/*pathology ; Male ; Middle Aged ; Streptokinase/metabolism ; T-Lymphocytes, Helper-Inducer/immunology/*metabolism/*pathology ; Tumor Necrosis Factor-alpha/biosynthesis/immunology
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  • 7
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    How Cooper pairs vanish approaching the Mott insulator in Bi2Sr2CaCu2O8+delta (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-08-30
    Description: The antiferromagnetic ground state of copper oxide Mott insulators is achieved by localizing an electron at each copper atom in real space (r-space). Removing a small fraction of these electrons (hole doping) transforms this system into a superconducting fluid of delocalized Cooper pairs in momentum space (k-space). During this transformation, two distinctive classes of electronic excitations appear. At high energies, the mysterious 'pseudogap' excitations are found, whereas, at lower energies, Bogoliubov quasi-particles-the excitations resulting from the breaking of Cooper pairs-should exist. To explore this transformation, and to identify the two excitation types, we have imaged the electronic structure of Bi(2)Sr(2)CaCu(2)O(8+delta) in r-space and k-space simultaneously. We find that although the low-energy excitations are indeed Bogoliubov quasi-particles, they occupy only a restricted region of k-space that shrinks rapidly with diminishing hole density. Concomitantly, spectral weight is transferred to higher energy r-space states that lack the characteristics of excitations from delocalized Cooper pairs. Instead, these states break translational and rotational symmetries locally at the atomic scale in an energy-independent way. We demonstrate that these unusual r-space excitations are, in fact, the pseudogap states. Thus, as the Mott insulating state is approached by decreasing the hole density, the delocalized Cooper pairs vanish from k-space, to be replaced by locally translational- and rotational-symmetry-breaking pseudogap states in r-space.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kohsaka, Y -- Taylor, C -- Wahl, P -- Schmidt, A -- Lee, Jhinhwan -- Fujita, K -- Alldredge, J W -- McElroy, K -- Lee, Jinho -- Eisaki, H -- Uchida, S -- Lee, D-H -- Davis, J C -- England -- Nature. 2008 Aug 28;454(7208):1072-8. doi: 10.1038/nature07243.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉LASSP, Department of Physics, Cornell University, Ithaca, New York 14853, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18756248" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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    Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-09-05
    Description: The cores of most galaxies are thought to harbour supermassive black holes, which power galactic nuclei by converting the gravitational energy of accreting matter into radiation. Sagittarius A* (Sgr A*), the compact source of radio, infrared and X-ray emission at the centre of the Milky Way, is the closest example of this phenomenon, with an estimated black hole mass that is 4,000,000 times that of the Sun. A long-standing astronomical goal is to resolve structures in the innermost accretion flow surrounding Sgr A*, where strong gravitational fields will distort the appearance of radiation emitted near the black hole. Radio observations at wavelengths of 3.5 mm and 7 mm have detected intrinsic structure in Sgr A*, but the spatial resolution of observations at these wavelengths is limited by interstellar scattering. Here we report observations at a wavelength of 1.3 mm that set a size of 37(+16)(-10) microarcseconds on the intrinsic diameter of Sgr A*. This is less than the expected apparent size of the event horizon of the presumed black hole, suggesting that the bulk of Sgr A* emission may not be centred on the black hole, but arises in the surrounding accretion flow.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Doeleman, Sheperd S -- Weintroub, Jonathan -- Rogers, Alan E E -- Plambeck, Richard -- Freund, Robert -- Tilanus, Remo P J -- Friberg, Per -- Ziurys, Lucy M -- Moran, James M -- Corey, Brian -- Young, Ken H -- Smythe, Daniel L -- Titus, Michael -- Marrone, Daniel P -- Cappallo, Roger J -- Bock, Douglas C-J -- Bower, Geoffrey C -- Chamberlin, Richard -- Davis, Gary R -- Krichbaum, Thomas P -- Lamb, James -- Maness, Holly -- Niell, Arthur E -- Roy, Alan -- Strittmatter, Peter -- Werthimer, Daniel -- Whitney, Alan R -- Woody, David -- England -- Nature. 2008 Sep 4;455(7209):78-80. doi: 10.1038/nature07245.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Massachusetts Institute of Technology (MIT) Haystack Observatory, Off Route 40, Westford, Massachusetts 01886, USA. sdoeleman@haystack.mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18769434" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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    Behavioural neuroscience: Out of sight, but not out of mind (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-06-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tomchik, Seth M -- Davis, Ronald L -- England -- Nature. 2008 Jun 26;453(7199):1192-4. doi: 10.1038/4531192a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18580936" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Drosophila melanogaster/enzymology/*physiology ; Humans ; Locomotion/physiology ; Memory/*physiology ; Models, Neurological ; Neurons/enzymology/metabolism ; Orientation/*physiology ; Ribosomal Protein S6 Kinases, 90-kDa/genetics/metabolism ; Space Perception/*physiology ; gamma-Aminobutyric Acid/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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    Force-induced activation of covalent bonds in mechanoresponsive polymeric materials (2009)
    Nature Publishing Group (NPG)
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    Publication Date: 2009-05-09
    Description: Mechanochemical transduction enables an extraordinary range of physiological processes such as the sense of touch, hearing, balance, muscle contraction, and the growth and remodelling of tissue and bone. Although biology is replete with materials systems that actively and functionally respond to mechanical stimuli, the default mechanochemical reaction of bulk polymers to large external stress is the unselective scission of covalent bonds, resulting in damage or failure. An alternative to this degradation process is the rational molecular design of synthetic materials such that mechanical stress favourably alters material properties. A few mechanosensitive polymers with this property have been developed; but their active response is mediated through non-covalent processes, which may limit the extent to which properties can be modified and the long-term stability in structural materials. Previously, we have shown with dissolved polymer strands incorporating mechanically sensitive chemical groups-so-called mechanophores-that the directional nature of mechanical forces can selectively break and re-form covalent bonds. We now demonstrate that such force-induced covalent-bond activation can also be realized with mechanophore-linked elastomeric and glassy polymers, by using a mechanophore that changes colour as it undergoes a reversible electrocyclic ring-opening reaction under tensile stress and thus allows us to directly and locally visualize the mechanochemical reaction. We find that pronounced changes in colour and fluorescence emerge with the accumulation of plastic deformation, indicating that in these polymeric materials the transduction of mechanical force into the ring-opening reaction is an activated process. We anticipate that force activation of covalent bonds can serve as a general strategy for the development of new mechanophore building blocks that impart polymeric materials with desirable functionalities ranging from damage sensing to fully regenerative self-healing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, Douglas A -- Hamilton, Andrew -- Yang, Jinglei -- Cremar, Lee D -- Van Gough, Dara -- Potisek, Stephanie L -- Ong, Mitchell T -- Braun, Paul V -- Martinez, Todd J -- White, Scott R -- Moore, Jeffrey S -- Sottos, Nancy R -- England -- Nature. 2009 May 7;459(7243):68-72. doi: 10.1038/nature07970.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of Illinois at Urbana-Champaign, Illinois 61801, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19424152" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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