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Steinhilber, Dieter ; Fischer, Astrid Stefanie ; Metzner, Julia ; Steinbrink, Svenja Dorothea ; Roos, Jessica ; Ruthardt, Martin ; Maier, Thorsten Jürgen
Leukotrienes constitute a group of bioactive lipids generated by the 5-lipoxygenase (5-LO) pathway. An increasing body of evidence supports an acute role for 5-LO products already during the earliest stages of pancreatic, prostate, and colorectal carcinogenesis. Several pieces of experimental data form the basis for this hypothesis and suggest a correlation between 5-LO expression and tumor cell viability. First, several independent studies documented an overexpression of 5-LO in primary tumor cells as well as in established cancer cell lines. Second, addition of 5-LO products to cultured tumor cells also led to increased cell proliferation and activation of anti-apoptotic signaling pathways. 5-LO antisense technology approaches demonstrated impaired tumor cell growth due to reduction of 5-LO expression. Lastly, pharmacological inhibition of 5-LO potently suppressed tumor cell growth by inducing cell cycle arrest and triggering cell death via the intrinsic apoptotic pathway. However, the documented strong cytotoxic off-target effects of 5-LO inhibitors, in combination with the relatively high concentrations of 5-LO products needed to achieve mitogenic effects in cell culture assays, raise concern over the assignment of the cause, and question the relationship between 5-LO products and tumorigenesis. Keywords: leukotriene, apoptosis, cell proliferation, mitogenic effects, cytotoxicity
Gehrke, Peter ; Hartjen, Philip ; Smeets, Ralf ; Gosau, Martin ; Peters, Ulrike ; Beikler, Thomas ; Fischer, Carsten ; Stolzer, Carolin ; Geis-Gerstorfer, Jürgen ; Weigl, Paul ; Schäfer, Sogand
Encouraging clinical results were reported on a novel cone-in-cone coupling for the fixation of dental implant-supported crowns (Acuris, Dentsply Sirona Implants, Mölndal, Sweden). However, the presence or absence of a microgap and a potential bacterial leakage at the conometric joint has not yet been investigated. A misfit and a resulting gap between the conometric components could potentially serve as a bacterial reservoir that promotes plaque formation, which in turn may lead to inflammation of the peri-implant tissues. Thus, a two-fold study set-up was designed in order to evaluate the bidirectional translocation of bacteria along conometrically seated single crowns. On conometric abutments filled with a culture suspension of anaerobic bacteria, the corresponding titanium nitride-coated (TiN) caps were fixed by friction. Each system was sterilized and immersed in culture medium to provide an optimal environment for microbial growth. Positive and negative controls were prepared. Specimens were stored in an anaerobic workstation, and total and viable bacterial counts were determined. Every 48 h, samples were taken from the reaction tubes to inoculate blood agar plates and to isolate bacterial DNA for quantification using qrt-PCR. In addition, one Acuris test system was subjected to scanning electron microscopy (SEM) to evaluate the precision of fit of the conometric coupling and marginal crown opening. Throughout the observational period of one week, blood agar plates of the specimens showed no viable bacterial growth. qrt-PCR, likewise, yielded a result approaching zero with an amount of about 0.53 × 10−4 µg/mL DNA. While the luting gap/marginal opening between the TiN-cap and the ceramic crown was within the clinically acceptable range, the SEM analysis failed to identify a measurable microgap at the cone-in-cone junction. Within the limits of the in-vitro study it can be concluded that the Acuris conometric interface does not allow for bacterial translocation under non-dynamic loading conditions.
Slik, J. W. Ferry ; Franklin, Janet ; Arroyo-Rodríguez, Víctor ; Field, Richard ; Aguilar, Salomon ; Aguirre, Nikolay ; Ahumada, Jorge ; Aiba, Shin-Ichiro ; Alves, Luciana F. ; Anitha, Kamalakumari ; Avella, Andres ; Mora, Francisco ; Aymard, Gerardo A. ; Báez, Selene ; Balvanera, Patricia ; Bastian, Meredith L. ; Bastin, Jean-François ; Bellingham, Peter ; van den Berg, Eduardo ; da Conceição Bispo, Polyanna ; Boeckx, Pascal ; Böhning-Gaese, Katrin ; Bongers, Frans ; Boyle, Brad ; Brambach, Fabian ; Brearley, Francis Q. ; Brown, Sandra ; Chai, Shauna-Lee ; Chazdon, Robin L. ; Chen, Shengbin ; Chhang, Phourin ; Chuyong, George ; Ewangog, Corneille ; Coronado, Indiana ; Cristóbal-Azkarate, Jurgi ; Culmsee, Heike ; Damas, Kipiro ; Dattaraja, Handanakere Shivaramaiah ; Davidar, Priya ; DeWalt, Saara J. ; Din, Hazimah ; Drake, Donald R. ; Duque, Alvaro ; Durigan, Giselda ; Eichhorn, Karl ; Schmidt Eler, Eduardo ; Enoki, Tsutomu ; Ensslin, Andreas ; Fandohan, Adandé Belarmain ; Farwig, Nina ; Feeley, Kenneth J. ; Fischer, Markus ; Forshed, Olle ; Garcia, Queila Souza ; Garkoti, Satish Chandra ; Gillespie, Thomas William ; Gillet, Jean-Francois ; Gonmadje, Christelle ; Granzow-de la Cerda, Iñigo ; Griffith, Daniel M. ; Grogan, James ; Hakeem, Khalid Rehman ; Harris, David J. ; Harrison, Rhett D. ; Hector, Andy ; Hemp, Andreas ; Homeier, Jürgen ; Hussain, M. Shah ; Ibarra Manríquez, Guillermo ; Hanum, I. Faridah ; Imai, Nobuo ; Jansen, Patrick A. ; Joly, Carlos Alfredo ; Joseph, Shijo ; Kartawinata, Kuswata ; Kearsley, Elizabeth ; Kelly, Daniel L. ; Kessler, Michael ; Killeen, Timothy J. ; Kooyman, Robert ; Laumonier, Yves ; Laurance, Susan G. ; Laurance, William F. ; Lawes, Michael J. ; Letcher, Susan G. ; Lindsell, Jeremy ; Lovett, Jon ; Lozada, Jose ; Lu, Xinghui ; Lykke, Anne Mette ; Bin Mahmud, Khairil ; Mahayani, Ni Putu Diana ; Mansor, Asyraf ; Marshall, Andrew R. ; Martin, Emanuel H. ; Leal Matos, Darley Calderado ; Meave, Jorge A. ; Melo, Felipe P. L. ; Aguirre Mendoza, Zhofre ; Metali, Faizah ; Medjibe, Vincent P. ; Metzger, Jean Paul ; Metzker, Thiago ; Mohandass, Dharmalingam ; Munguía-Rosas, Miguel A. ; Muñoz, Rodrigo ; Nurtjahy, Eddy ; Lenza de Oliveira, Eddie ; Onrizal, Onrizal ; Parolin, Pia ; Parren, Marc ; Parthasarathy, Narayanaswamy ; Paudel, Ekananda ; Perez, Rolando ; Pérez-García, Eduardo A. ; Pommer, Ulf ; Poorter, Lourens ; Qi, Lan ; F. Piedade, Maria Teresa ; Rodrigues Pinto, José Roberto ; Dalberg Poulsen, Axel ; Poulsen, John R. ; Powers, Jennifer S. ; Prasad, Rama Chandra ; Puyravaud, Jean-Philippe ; Rangel, Orlando ; Reitsma, Jan ; S. B. Rocha, Diogo ; Rolim, Samir ; Rovero, Francesco ; Rozak, Andes ; Ruokolainen, Kalle ; Rutishauser, Ervan ; Rutten, Gemma ; Mohd. Said, Mohd. Nizam ; Saiter, Felipe Z. ; Saner, Philippe ; Santos, Braulio ; dos Santos, João Roberto ; Sarker, Swapan Kumar ; Schmitt, Christine B. ; Schöngart, Jochen ; Schulze, Mark ; Sheil, Douglas ; Sist, Plinio ; Souza, Alexandre F. ; Spironello, Wilson Roberto ; Sposito, Tereza ; Steinmetz, Robert ; Stevart, Tariq ; Suganuma, Marcio Seiji ; Sukri, Rahayu ; Sultana, Aisha ; Sukumar, Raman ; Sunderland, Terry ; Supriyadi, Agus ; Suresh, Hebbalalu S. ; Suzuki, Eizi ; Tabarelli, Marcelo ; Tang, Jianwei ; Tanner, Edmund V. J. ; Targhetta, Natalia ; Theilade, Ida ; Thomas, Duncan ; Timberlake, Jonathan ; de Morisson Valeriano, Márcio ; Valkenburg, Johan van ; Do, Tran Van ; Sam, Hoang Van ; Vandermeer, John H. ; Verbeeck, Hans ; Vetaas, Ole Reidar ; Adekunle, Victor ; Vieira, Simone A. ; Webb, Campbell O. ; Webb, Edward L. ; Whitfeld, Timothy ; Wich, Serge ; Williams, John ; Wiser, Susan ; Wittmann, Florian ; Yang, Xiaobo ; Adou Yao, C. Yves ; Yap, Sandra L. ; Zahawie, Rakan A. ; Zakaria, Rahmad ; Zang, Runguo
Knowledge about the biogeographic affinities of the world’s tropical forests helps to better understand regional differences in forest structure, diversity, composition, and dynamics. Such understanding will enable anticipation of region-specific responses to global environmental change. Modern phylogenies, in combination with broad coverage of species inventory data, now allow for global biogeographic analyses that take species evolutionary distance into account. Here we present a classification of the world’s tropical forests based on their phylogenetic similarity. We identify five principal floristic regions and their floristic relationships: (i) Indo-Pacific, (ii) Subtropical, (iii) African, (iv) American, and (v) Dry forests. Our results do not support the traditional neo- versus paleotropical forest division but instead separate the combined American and African forests from their Indo-Pacific counterparts. We also find indications for the existence of a global dry forest region, with representatives in America, Africa, Madagascar, and India. Additionally, a northern-hemisphere Subtropical forest region was identified with representatives in Asia and America, providing support for a link between Asian and American northern-hemisphere forests.
Barth, Klaus ; Belov, Alexander ; Beltran, Berta ; Bräuninger, Heinrich ; Carmona, José Manuel ; Collar, Juan I. ; Dafni, Theopisti ; Davenport, Martyn ; Di Lella, Luigi ; Eleftheriadis, Christos ; Englhauser, Jakob ; Fanourakis, George ; Ferrer-Ribas, Ester ; Fischer, Horst ; Franz, Jürgen ; Friedrich, Peter ; Galán, Javier ; García, J. A. ; Geralis, Theodoros ; Giomataris, Ioanis ; Gninenko, Sergei ; Gómez, Héctor ; Hasinoff, Michael D. ; Heinsius, Fritz-Herbert ; Hoffmann, Dieter H. H. ; Irastorza, Igor Garcia ; Jacoby, Joachim ; Jakovčić, Kresimir ; Kang, Donghwa ; Königsmann, Kay ; Kotthaus, Rainer ; Kousouris, Konstantinos ; Krčmar, Milica ; Kuster, M. ; Lakić, Biljana ; Liolios, Anastasios ; Ljubičić, Ante ; Lutz, Gerhard ; Luzón, Gloria ; Miller, David W. ; Papaevangelou, Thomas ; Pivovaroff, Mike J. ; Raffelt, Georg ; Redondo, Javier ; Riege, Hans ; Rodríguez, A. ; Ruz, Jaime ; Savvidis, Ilias ; Semertzidis, Yannis ; Stewart, Laura ; Van Bibber, Karl A. ; Vieira, Joaquin D. ; Villar, José A. ; Vogel, Julia K. ; Walckiers, Louis ; Zioutas, Konstantin
In non-hadronic axion models, which have a tree-level axion-electron interaction, the Sun produces a strong axion flux by bremsstrahlung, Compton scattering, and axiorecombination, the "BCA processes." Based on a new calculation of this flux, including for the first time axio-recombination, we derive limits on the axion-electron Yukawa coupling gae and axion-photon interaction strength ga using the CAST phase-I data (vacuum phase). For ma <~ 10 meV/c2 we find ga gae < 8.1 × 10−23 GeV−1 at 95% CL. We stress that a next-generation axion helioscope such as the proposed IAXO could push this sensitivity into a range beyond stellar energy-loss limits and test the hypothesis that white-dwarf cooling is dominated by axion emission.