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Braun A, Martinez C, Schmitteckert S, Röth R, Lasitschka F, Niesler B. Site-specific gene expression analysis from archived human intestine samples combining laser-capture microdissection and multiplexed color-coded probes. Neurogastroenterol Motil 2018; 30:e13261. [PMID: 29193461 DOI: 10.1111/nmo.13261] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 11/07/2017] [Indexed: 02/08/2023]
Abstract
BACKGROUND Alterations of site-specific gene expression profiles in disease-relevant networks within the different layers of the intestinal wall may contribute to the onset and clinical course of gastrointestinal disorders. To date, no systematic analysis has assessed and compared sub-regional gene expression patterns in all distinct layers of the gut using fresh frozen human samples. Our aim was to establish an optimized protocol for site-specific RNA isolation in order to achieve maximum RNA quality and amount for subsequent gene expression analysis combining laser-capture microdissection (LCM) with a probe-based technology, the NanoString nCounter Analysis system. METHODS Four full-thickness colon samples from patients who underwent surgery due to pathological conditions were processed and separated into epithelium, lamina propria, myenteric plexus, submucosa, and tunica muscularis by LCM. Site-specific marker expression by nCounter technology was performed on total RNA from each sub-region, respectively. KEY RESULTS Collecting ~10 mm² (~100 000-250 000 cells) of tissue from the epithelial layer, lamina propria, and myenteric plexus provided sufficient amounts of RNA of appropriate quality for subsequent analyses. In contrast, ~40 mm² (~250 000-650 000 cells) of tissue were dissected from the less cell-rich submucosal and tunica muscularis layer. nCounter analysis revealed a site-specific expression pattern of marker genes in the different layers of the colonic wall which were highly correlating (r > .9). CONCLUSIONS AND INFERENCES LCM in combination with nCounter expression analysis enables site-specific, sensitive, reliable detection, and quantification of mRNA from histologically heterogeneous tissues.
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Tabeling C, Herbert J, Boiarina E, Hocke AC, Sewald K, Lamb DJ, Wollin SL, Fehrenbach H, Kübler WM, Braun A, Suttorp N, Weissmann N, Witzenrath M. Die Milztyrosinkinase SYK reguliert die pulmonale Vasokonstriktion. Pneumologie 2018. [DOI: 10.1055/s-0037-1619299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Klymenko T, Bloehdorn J, Bahlo J, Robrecht S, Akylzhanova G, Cox K, Estenfelder S, Wang J, Edelmann J, Strefford JC, Wojdacz TK, Fischer K, Hallek M, Stilgenbauer S, Cragg M, Gribben J, Braun A. Lamin B1 regulates somatic mutations and progression of B-cell malignancies. Leukemia 2018; 32:364-375. [PMID: 28804121 PMCID: PMC5808072 DOI: 10.1038/leu.2017.255] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 07/07/2017] [Accepted: 07/31/2017] [Indexed: 12/24/2022]
Abstract
Somatic hypermutation (SHM) is a pivotal process in adaptive immunity that occurs in the germinal centre and allows B cells to change their primary DNA sequence and diversify their antigen receptors. Here, we report that genome binding of Lamin B1, a component of the nuclear envelope involved in epigenetic chromatin regulation, is reduced during B-cell activation and formation of lymphoid germinal centres. Chromatin immunoprecipitation-Seq analysis showed that kappa and heavy variable immunoglobulin domains were released from the Lamin B1 suppressive environment when SHM was induced in B cells. RNA interference-mediated reduction of Lamin B1 resulted in spontaneous SHM as well as kappa-light chain aberrant surface expression. Finally, Lamin B1 expression level correlated with progression-free and overall survival in chronic lymphocytic leukaemia, and was strongly involved in the transformation of follicular lymphoma. In summary, here we report that Lamin B1 is a negative epigenetic regulator of SHM in normal B-cells and a 'mutational gatekeeper', suppressing the aberrant mutations that drive lymphoid malignancy.
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MESH Headings
- B-Lymphocytes/pathology
- Cell Line, Tumor
- Chromatin Immunoprecipitation/methods
- Disease Progression
- Humans
- Immunoglobulin Heavy Chains/genetics
- Immunoglobulin Variable Region/genetics
- Lamin Type B/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/pathology
- Lymphoma, Follicular/genetics
- Lymphoma, Follicular/pathology
- Somatic Hypermutation, Immunoglobulin/genetics
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Foster M, LeMaster M, Braun A, England EM, Spees C, Clinton S. Providing Lean Beef for the Next Project: Beef as a Component of a Healthy Dietary Pattern in Cancer Survivors. MEAT AND MUSCLE BIOLOGY 2018. [DOI: 10.22175/rmc2018.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Reier K, Brauns B, Lorenz V, Mempel M, Schön M, Braun A. 105 An acute AD-like phenotype facilitates allergen sensitization and aggravates experimental asthma in barrier-impaired FlgHrnr-/- mice. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.07.415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Marx L, Lehnerts S, Grundmann D, Schreiber D, Braun A, Abdel-Aziz H, Kelber O, Schäfer KH. The influence of the multicomponent herbal preparation STW5 on intestinal inflammation and motility. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ciappina MF, Pérez-Hernández JA, Landsman AS, Okell WA, Zherebtsov S, Förg B, Schötz J, Seiffert L, Fennel T, Shaaran T, Zimmermann T, Chacón A, Guichard R, Zaïr A, Tisch JWG, Marangos JP, Witting T, Braun A, Maier SA, Roso L, Krüger M, Hommelhoff P, Kling MF, Krausz F, Lewenstein M. Attosecond physics at the nanoscale. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2017; 80:054401. [PMID: 28059773 DOI: 10.1088/1361-6633/aa574e] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Recently two emerging areas of research, attosecond and nanoscale physics, have started to come together. Attosecond physics deals with phenomena occurring when ultrashort laser pulses, with duration on the femto- and sub-femtosecond time scales, interact with atoms, molecules or solids. The laser-induced electron dynamics occurs natively on a timescale down to a few hundred or even tens of attoseconds (1 attosecond = 1 as = 10-18 s), which is comparable with the optical field. For comparison, the revolution of an electron on a 1s orbital of a hydrogen atom is ∼152 as. On the other hand, the second branch involves the manipulation and engineering of mesoscopic systems, such as solids, metals and dielectrics, with nanometric precision. Although nano-engineering is a vast and well-established research field on its own, the merger with intense laser physics is relatively recent. In this report on progress we present a comprehensive experimental and theoretical overview of physics that takes place when short and intense laser pulses interact with nanosystems, such as metallic and dielectric nanostructures. In particular we elucidate how the spatially inhomogeneous laser induced fields at a nanometer scale modify the laser-driven electron dynamics. Consequently, this has important impact on pivotal processes such as above-threshold ionization and high-order harmonic generation. The deep understanding of the coupled dynamics between these spatially inhomogeneous fields and matter configures a promising way to new avenues of research and applications. Thanks to the maturity that attosecond physics has reached, together with the tremendous advance in material engineering and manipulation techniques, the age of atto-nanophysics has begun, but it is in the initial stage. We present thus some of the open questions, challenges and prospects for experimental confirmation of theoretical predictions, as well as experiments aimed at characterizing the induced fields and the unique electron dynamics initiated by them with high temporal and spatial resolution.
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Braun A, Hölemann P. Über die Temperaturabhängigkeit der Refraktion des Jods und über die Refraktion des atomaren Jods. Z PHYS CHEM 2017. [DOI: 10.1515/zpch-1936-3430] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Stingl K, Bartz-Schmidt KU, Braun A, Gekeler F, Greppmaier U, Schatz A, Stett A, Strasser T, Kitiratschky V, Zrenner E. Transfer characteristics of subretinal visual implants: corneally recorded implant responses. Doc Ophthalmol 2016; 133:81-90. [PMID: 27510912 PMCID: PMC5052310 DOI: 10.1007/s10633-016-9557-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 07/26/2016] [Indexed: 11/30/2022]
Abstract
PURPOSE The subretinal Alpha IMS visual implant is a CE-approved medical device for restoration of visual functions in blind patients with end-stage outer retina degeneration. We present a method to test the function of the implant objectively in vivo using standard electroretinographic equipment and to assess the devices' parameter range for an optimal perception. METHODS Subretinal implant Alpha IMS (Retina Implant AG, Reutlingen, Germany) consists of 1500 photodiode-amplifier-electrode units and is implanted surgically into the subretinal space in blind retinitis pigmentosa patients. The voltages that regulate the amplifiers' sensitivity (V gl) and gain (V bias), related to the perception of contrast and brightness, respectively, are adjusted manually on a handheld power supply device. Corneally recorded implant responses (CRIR) to full-field illumination with long duration flashes in various implant settings for brightness gain (V bias) and amplifiers' sensitivity (V gl) are measured using electroretinographic setup with a Ganzfeld bowl in a protocol of increasing stimulus luminances up to 1000 cd/m2. RESULTS CRIRs are a meaningful tool for assessing the transfer characteristic curves of the electronic implant in vivo monitoring the implants' voltage output as a function of log luminance in a sigmoidal shape. Changing the amplifiers' sensitivity (V gl) shifts the curve left or right along the log luminance axis. Adjustment of the gain (V bias) changes the maximal output. Contrast perception is only possible within the luminance range of the increasing slope of the function. CONCLUSIONS The technical function of subretinal visual implants can be measured objectively using a standard electroretinographic setup. CRIRs help the patient to optimise the perception by adjusting the gain and luminance range of the device and are a useful tool for clinicians to objectively assess the function of subretinal visual implants in vivo.
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Haider G, Wiegand S, Spies E, Braun A, Kummer W, Nassenstein C. Effects of TRPA1 agonists on murine airways. Pneumologie 2016. [DOI: 10.1055/s-0036-1584649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Obernolte H, Ritter D, Knebel J, Braubach P, Jonigk D, Warnecke G, Krüger M, Fieguth HG, Pfennig O, Braun A, Sewald K. Cigarette Smoke and Cigarette Smoke Condensate Induce Inflammation and Cytotoxicity in Precision-Cut Lung Slices (PCLS). Pneumologie 2016. [DOI: 10.1055/s-0036-1584646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Mackay LK, Minnich M, Kragten NAM, Liao Y, Nota B, Seillet C, Zaid A, Man K, Preston S, Freestone D, Braun A, Wynne-Jones E, Behr FM, Stark R, Pellicci DG, Godfrey DI, Belz GT, Pellegrini M, Gebhardt T, Busslinger M, Shi W, Carbone FR, van Lier RAW, Kallies A, van Gisbergen KPJM. Hobit and Blimp1 instruct a universal transcriptional program of tissue residency in lymphocytes. Science 2016; 352:459-63. [DOI: 10.1126/science.aad2035] [Citation(s) in RCA: 553] [Impact Index Per Article: 69.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 03/21/2016] [Indexed: 12/12/2022]
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Lamb DJ, Wollin SL, Schnapp A, Bischoff D, Erb KJ, Bouyssou T, Guilliard B, Strasser C, Wex E, Blum S, Thaler E, Nickel H, Radmacher O, Haas H, Swantek JL, Souza D, Canfield M, White D, Panzenbeck M, Kashem MA, Sanville-Ross M, Kono T, Sewald K, Braun A, Obernolte H, Danov O, Schaenzle G, Rast G, Maier GM, Hoffmann M. BI 1002494, a Novel Potent and Selective Oral Spleen Tyrosine Kinase Inhibitor, Displays Differential Potency in Human Basophils and B Cells. ACTA ACUST UNITED AC 2016; 357:554-61. [DOI: 10.1124/jpet.116.233155] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Accepted: 03/31/2016] [Indexed: 01/29/2023]
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Booth JL, Duggan ES, Patel VI, Metcalf J, Langer M, Coggeshall KM, Braun A. ID: 106: ALVEOLAR ESCAPE BY BACILLUS ANTHRACIS SPORES DOES NOT REQUIRE A CARRIER CELL AND IS NOT ALTERED BY LETHAL TOXIN. J Investig Med 2016. [DOI: 10.1136/jim-2016-000120.101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
RationaleThe lung is the entry site for Bacillus anthracis in inhalation anthrax, the most deadly form of the disease. B. anthracis spores must escape from the alveolus, pass to the regional lymph nodes, germinate and enter the circulatory system as vegetative bacteria to cause systemic disease. Of the resident lung cells, three have been reported to take up B. anthracis spores: the antigen presenting cells (APC) alveolar macrophages and dendritic cells, and alveolar epithelial cells (AEC). Also, B. anthracis produces the exotoxins lethal factor and protective antigen (PA) which combine to form lethal toxin (LT), a metalloproteinase important in pathogenicity. The roles of carrier cells and the effects of B. anthracis toxins in escape of spores from the alveolus are unclear, especially in humans.MethodsWe employed a human lung organ culture model and a human A549 alveolar epithelial cell culture model, along with fluorescent confocal imaging to quantitate spore partitioning between APC and AEC, and the effects of B. anthracis LT and PA on this process. Cell types were distinguished by positive staining for HLA-DR (APC) and cytokeratin (AEC).ResultsWe found that spores progressed through the lung slice over time, and that spore movement was not dependent on cell internalization. Both free and cell-associated spores moved through slices between 2 and 48 hrs of incubation. However, partitioning of spores between AEC, APC, and the extracellular space did not significantly change over this time. After 2 hrs, 4.7% of spores were in APC; 13.8% in AEC; and 81.5% were not cell-associated. By 48 hrs, 2.9% were in APC; 12.7% were in AEC; and 84.4% were not cell-associated. Spores also internalized in a non-uniform manner, with more variable spore internalization into AEC than into APC. At all incubation times, the majority of cell-associated spores were in AEC, not in APC. PA and LT did not affect transit of the spores through the lung tissue or the distribution of spores into AEC and APC. In A549 cells, spore internalization increased significantly after 24 hrs incubation. However, there was no statistically consistent effects of PA or LT on spore internalization in A549 cells.ConclusionsOverall, our results support a “Jailbreak”-like model of spore escape from the alveolus that involves transient passage of spores, although this occurs through intact AEC. However, subsequent transport of spores by APC from the lung to the lymph nodes may occur.
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Braun A. Neuroimmunologie und ihre Bedeutung in der Allergologie. ALLERGOLOGIE 2016. [DOI: 10.1007/978-3-642-37203-2_15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Oeder S, Alessandrini F, Wirz OF, Braun A, Wimmer M, Frank U, Hauser M, Durner J, Ferreira F, Ernst D, Mempel M, Gilles S, Buters JTM, Behrendt H, Traidl-Hoffmann C, Schmidt-Weber C, Akdis M, Gutermuth J. Pollen-derived nonallergenic substances enhance Th2-induced IgE production in B cells. Allergy 2015. [PMID: 26214762 DOI: 10.1111/all.12707] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND B cells play a central role in IgE-mediated allergies. In damaged airway epithelium, they are exposed directly to aeroallergens. We aimed to assess whether direct exposure of B cells to pollen constituents affects allergic sensitization. METHODS B cells from murine splenocytes and from blood samples of healthy donors were incubated for 8 days under Th2-like conditions with aqueous ragweed pollen extracts (Amb-APE) or its constituents. Secreted total IgM, IgG, and IgE was quantified by ELISA. Additionally, birch, grass, or pine-pollen extracts were tested. The number of viable cells was evaluated by ATP measurements. B-cell proliferation was measured by CFSE staining. IgE class switch was analyzed by quantitation of class switch transcripts. In an OVA/Alum i.p.-sensitization mouse model, Amb-APE was intranasally instilled for 11 consecutive days. RESULTS Upon Th2 priming of murine B cells, ragweed pollen extract caused a dose-dependent increase in IgE production, while IgG and IgM were not affected. The low-molecular-weight fraction and phytoprostane E1 (PPE1) increased IgE production, while Amb a 1 did not. PPE1 enhanced IgE also in human memory B cells. Under Th1 conditions, Amb-APE did not influence immunoglobulin secretion. The IgE elevation was not ragweed specific. It correlated with proliferation of viable B cells, but not with IgE class switch. In vivo, Amb-APE increased total IgE and showed adjuvant activity in allergic airway inflammation. CONCLUSIONS Aqueous pollen extracts, the protein-free fraction of Amb-APE, and the pollen-contained substance PPE1 specifically enhance IgE production in Th2-primed B cells. Thus, pollen-derived nonallergenic substances might be responsible for B-cell-dependent aggravation of IgE-mediated allergies.
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Obernolte H, Konzok S, Ritter D, Knebel J, Braubach P, Jonigk D, Braun A, Sewald K. Cigarette smoke condensate and cigarette smoke induce cytotoxicity and inflammation in human and rodent Precision-Cut Lung Slices of different species. Pneumologie 2015. [DOI: 10.1055/s-0035-1556609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Konzok S, Schindler S, Jonigk D, Braubach P, Braun A, Sewald K. Development of a human organotypic tumor invasion model of cancer cell line MDA-MB-231 in Precision-Cut Lung Slices (PCLS). Pneumologie 2015. [DOI: 10.1055/s-0035-1556665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Haider G, Lee JH, Wiegand S, Spies E, Hoymann HG, Kummer W, Braun A, Nassenstein C. TRPA1 agonists modulate the trachealis muscle tone via two independent mechanisms. Pneumologie 2015. [DOI: 10.1055/s-0035-1556623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Huhn R, Lowe J, Grady M, Taitt C, Braun A. P-312 A Phase 3 Open-Label, Randomized, Multicenter Study of Imprime PGG in Combination with Cetuximab in Patients with KRAS Wild Type Metastatic Colorectal Cancer. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv233.309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Braun A, Rosner HJ, Hagensieker R, Dieball S. Multi-method dynamical reconstruction of the ecological impact of copper mining on Chinese historical landscapes. Ecol Modell 2015. [DOI: 10.1016/j.ecolmodel.2015.02.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Mishra R, Kyle B, Mewhort H, Fedak P, Braun A. Restoration of Endothelium‐dependent Vasodilatory Responses in T2D Resistance Arteries by a Pharmacologic Activator of Endothelial K
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Channels. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.789.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Braun A, Engel-Riedel W, Schneller F, Wolf M, Schuette W, Lowe J, Mattson P, Gargano M, Patchen M, Huhn R. Efficacy and Safety of Imprime Pgg, a Novel Innate Immune Modulator, in Combination with Bevacizumab (BEV), Carboplatin and Paclitaxel for the 1St-Line Treatment of Stage Iv Nsclc. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv050.16] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Senaati A, Braun A. Role of the interventional radiologist in the diagnosis and management of chylothorax: a review of traditional and novel methods. J Vasc Interv Radiol 2015. [DOI: 10.1016/j.jvir.2014.12.601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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