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  35. AU="François Lebargy"
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  1. Artikel ; Online: Zirconium-Based Metal Organic Frameworks for the Capture of Carbon Dioxide and Ethanol Vapour. A Comparative Study

    Meryem Saidi / Phuoc Hoang Ho / Pankaj Yadav / Fabrice Salles / Clarence Charnay / Luc Girard / Leila Boukli-Hacene / Philippe Trens

    Molecules, Vol 26, Iss 7620, p

    2021  Band 7620

    Abstract: This paper reports on the comparison of three zirconium-based metal organic frameworks (MOFs) for the capture of carbon dioxide and ethanol vapour at ambient conditions. In terms of efficiency, two parameters were evaluated by experimental and modeling ... ...

    Abstract This paper reports on the comparison of three zirconium-based metal organic frameworks (MOFs) for the capture of carbon dioxide and ethanol vapour at ambient conditions. In terms of efficiency, two parameters were evaluated by experimental and modeling means, namely the nature of the ligands and the size of the cavities. We demonstrated that amongst three Zr-based MOFs, MIP-202 has the highest affinity for CO 2 (−50 kJ·mol −1 at low coverage against around −20 kJ·mol −1 for MOF-801 and Muc Zr MOF), which could be related to the presence of amino functions borne by its aspartic acid ligands as well as the presence of extra-framework anions. On the other side, regardless of the ligand size, these three materials were able to adsorb similar amounts of carbon dioxide at 1 atm (between 2 and 2.5 µmol·m −2 at 298 K). These experimental findings were consistent with modeling studies, despite chemisorption effects, which could not be taken into consideration by classical Monte Carlo simulations. Ethanol adsorption confirmed these results, higher enthalpies being found at low coverage for the three materials because of stronger van der Waals interactions. Two distinct sorption processes were proposed in the case of MIP-202 to explain the shape of the enthalpic profiles.
    Schlagwörter adsorption ; metal organic framework ; carbon dioxide ; ethanol ; Organic chemistry ; QD241-441
    Sprache Englisch
    Erscheinungsdatum 2021-12-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel: VUV Photodeposition of Thiol-Terminated Films: A Wavelength-Dependent Study

    Kasparek, Evelyne / Jason R. Tavares / Michael R. Wertheimer / Pierre-Luc Girard-Lauriault

    Langmuir. 2018 Sept. 11, v. 34, no. 41

    2018  

    Abstract: Photoinitiated chemical vapor deposition (PICVD) has become attractive for selective and specific surface functionalization, because it relies on a single energy source, the photons, to carry out (photo-) chemistry. In the present wavelength (λ)- ... ...

    Abstract Photoinitiated chemical vapor deposition (PICVD) has become attractive for selective and specific surface functionalization, because it relies on a single energy source, the photons, to carry out (photo-) chemistry. In the present wavelength (λ)-dependent study, thiol (SH)-terminated thin film deposits have been prepared from gas mixtures of acetylene (C₂H₂) and hydrogen sulfide (H₂S) via PICVD using four different vacuum-ultraviolet (VUV) sources, namely, KrL (λₚₑₐₖ = 123.6 nm), XeL (λₚₑₐₖ = 147.0 nm), XeE (λₚₑₐₖ = 172.0 nm), and Hg (λ = 184.9 nm) lamps. Different λ influence the deposition kinetics and film composition, reflecting that photolytic reactions are governed by the gases’ absorption coefficients, k(λ). Thiol concentrations, [SH], up to ∼7.7%, were obtained with the XeL source, the highest reported in the literature so far. Furthermore, all films showed islandlike surface morphology, regardless of λ.
    Schlagwörter absorbance ; acetylene ; energy ; hydrogen sulfide ; lamps ; mercury ; photons ; thiols ; vapors ; wavelengths
    Sprache Englisch
    Erscheinungsverlauf 2018-0911
    Umfang p. 12234-12243.
    Erscheinungsort American Chemical Society
    Dokumenttyp Artikel
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.8b01691
    Datenquelle NAL Katalog (AGRICOLA)

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  3. Artikel: Are Keggin’s POMs Charged Nanocolloids or Multicharged Anions?

    Malinenko, Alla / Alban Jonchère / Luc Girard / Olivier Diat / Pierre Bauduin / Sandra Parrès-Maynadié

    Langmuir. 2018 Feb. 06, v. 34, no. 5

    2018  

    Abstract: Owing to their multiple charges and their nanometric size, polyoxometalates (POMs) are at the frontier between ions and charged colloids. We investigated here the effect of POM–POM electrostatics repulsions on their self-diffusion in water by varying POM ...

    Abstract Owing to their multiple charges and their nanometric size, polyoxometalates (POMs) are at the frontier between ions and charged colloids. We investigated here the effect of POM–POM electrostatics repulsions on their self-diffusion in water by varying POM and supporting salt concentrations. The self-diffusion coefficients of two Keggin’s POMs [silicotungstate (SiW12O404–) and phosphotungstate (PW12O403–)] were determined by dynamic light scattering (DLS) and 1H/31P DOSY NMR, whereas POM–POM electrostatic repulsions were investigated by the determination of the static structure factors using small-angle X-ray scattering (SAXS). The self-diffusion coefficients for the two POMs and for different POM/background salt concentrations were collected in a master curve by comparing the averaged POM–POM distance in solution to the Debye length. As for classical charged colloids, we show that the POM’s counterions should not be considered in the calculation of the ionic strength that governs POM–POM electrostatic repulsions. This result was confirmed by fitting the POM–POM structure factor by considering a pair potential of spherical charged particles using the well-known Hayter mean spherical approximation (MSA). These Keggin POMs also behave as (super)chaotropic anions (i.e., they have a strong propensity to adsorb on (neutral polar) surfaces, which was also investigated) here on the surface of octyl-β-glucoside (C8G1) micelles. The variations of (i) the chemical shift of 1H/31P NMR signals and (ii) the self-diffusion coefficients obtained by DOSY 1H/31P NMR of PW3– and of C8G1 were in good agreement, confirming the strong adsorption of POMs on the micelle polar surface from static and dynamic points of view. We concluded that Keggin’s POMs behave (i) as anions because they adsorb on surfaces as chaotropic anions and (ii) as colloids because they can be described by a classical colloidal approach by dynamic and static scattering techniques (i.e., by the investigation of their interparticle electrostatic structure factor and self-diffusion without considering the POM’s counterions in the ionic strength calculation). This work highlights the dynamic properties of POMs at soft interfaces compared to bulk aqueous solution, which is essential in the understanding of functional properties of POMs, such as (photo)catalysis and the rational design of POM-based hybrid nanomaterials from soft templating routes (i.e., in aqueous solutions at room temperature).
    Schlagwörter adsorption ; ambient temperature ; anions ; aqueous solutions ; catalytic activity ; colloids ; electrostatic interactions ; functional properties ; ionic strength ; light scattering ; micelles ; nanomaterials ; nuclear magnetic resonance spectroscopy ; small-angle X-ray scattering
    Sprache Englisch
    Erscheinungsverlauf 2018-0206
    Umfang p. 2026-2038.
    Erscheinungsort American Chemical Society
    Dokumenttyp Artikel
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.7b03640
    Datenquelle NAL Katalog (AGRICOLA)

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  4. Artikel: Adhesion of human monocytes to oxygen- and nitrogen- containing plasma polymers: Effect of surface chemistry and protein adsorption

    Babaei, Sara / Corinne A. Hoesli / Natalie Fekete / Pierre-Luc Girard-Lauriault

    Colloids and surfaces. 2018 Feb. 01, v. 162

    2018  

    Abstract: The interactions between monocytes and biomaterials can potentially be modulated by controlling the chemical and structural surface properties of biomaterials. The objective of this study was to determine the effect of plasma-deposited functional organic ...

    Abstract The interactions between monocytes and biomaterials can potentially be modulated by controlling the chemical and structural surface properties of biomaterials. The objective of this study was to determine the effect of plasma-deposited functional organic coatings on monocyte adhesion and differentiation into macrophages. Organic coatings with varying oxygen and nitrogen concentration were prepared by low-pressure plasma co-polymerization of binary gas mixtures combining a hydrocarbon (butadiene/ethylene) and a heteroatom-containing gas (carbon dioxide/ammonia) to deposit either oxygen or nitrogen-containing coatings. The deposition parameters controlled the composition of the coatings and, consequently, the surface charge (between 26 mV and −28 mV) and wettability. The adhesion of myeloid leukemia cell lines U937 and NB4 as well as human monocytes to plasma polymerized coatings, was tested using cell culture medium with and without fetal bovine serum. The results showed that the concentration of [-NH2] and [-COOH] on the surface of the plasma polymers, controls the adhesion of U937 and NB4 cell lines to the coatings. Thus, above a certain composition threshold, i.e. [-NH2]=2.6–3.0% and [-COOH]=1.2–1.57 nmol/cm2, the surface facilitates adhesion of both cell lines, irrespective of the culture medium used. Based on qualitative observations the number of monocytes adhering to the coatings was proportional to the concentration of functional groups at the surface of the coatings. The surface plasmon resonance results, in line with cell culture experiments, indicated that the presence of albumin on the surfaces with [-NH2] and [-COOH] above the determined critical concentration may be an indicator of monocyte adhesion to these plasma polymers.
    Schlagwörter adhesion ; adsorption ; albumins ; ammonia ; biocompatible materials ; carbon dioxide ; cell adhesion ; cell culture ; cell lines ; coatings ; copolymerization ; culture media ; ethylene ; fetal bovine serum ; humans ; macrophages ; moieties ; monocytes ; myeloid leukemia ; neoplasm cells ; nitrogen content ; oxygen ; polymers ; surface plasmon resonance ; wettability
    Sprache Englisch
    Erscheinungsverlauf 2018-0201
    Umfang p. 362-369.
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    ZDB-ID 1500523-9
    ISSN 1873-4367 ; 0927-7765
    ISSN (online) 1873-4367
    ISSN 0927-7765
    DOI 10.1016/j.colsurfb.2017.12.003
    Datenquelle NAL Katalog (AGRICOLA)

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  5. Artikel: Evaluation of ion separation coefficients by foam flotation using a carboxylate surfactant

    Micheau, Cyril / Andreas Schneider / Luc Girard / Pierre Bauduin

    Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2015 Apr. 01, v. 470

    2015  

    Abstract: Separation of metal cations of different charges, Na+, Li+, Ca2+, Sr2+, Cu2+, Nd3+ and Eu3+ was investigated through ion foam flotation using a pH sensitive surfactant, nonaoxyethylene oleyl ether carboxylic acid. We propose here a method to evaluate ion ...

    Abstract Separation of metal cations of different charges, Na+, Li+, Ca2+, Sr2+, Cu2+, Nd3+ and Eu3+ was investigated through ion foam flotation using a pH sensitive surfactant, nonaoxyethylene oleyl ether carboxylic acid. We propose here a method to evaluate ion selectivity coefficients using mass and volume balances. This method yields selectivity coefficients in agreement with those obtained with the classical slope method. The ion selectivity obtained by the flotation experiments was found to correlate well with the apparent charge of the surfactant micelles (zeta potential values) in the presence of different salts and is therefore not influenced by the surface curvature. Consequently the ion specificity order has been established according to the surfactant–ion affinity at the air–water and micelle–water interfaces as Na+<Li+<Sr2+<Ca2+<Cu2+<Nd3+<Eu3+. It has been noticed that the selectivity coefficients between the different metal ions, obtained by ion flotation, differ from the ones predicted by using metal ion complexation constants of acetate, which is considered here as the non-surface active complexing part of the surfactant. This discrepancy was attributed to the surface complexation effects at the air–water interface in flotation experiments and at the micelle–water interface. For the separation of lithium and neodymium, a depletion phenomenon of lithium ions from the interface, hence from the foam, has been observed, i.e. once the flotation experiment was finished, the lithium concentration in the remaining foaming solution was indeed higher compared to the initial one. This phenomenon was explained by the strong adsorption of Nd3+ that leads Li+ to be repelled from the foam.<br />
    Schlagwörter acetates ; adsorption ; calcium ; cations ; copper ; europium ; foaming ; foams ; lithium ; metal ions ; micelles ; neodymium ; pH ; salts ; sodium ; strontium ; surfactants ; zeta potential
    Sprache Englisch
    Erscheinungsverlauf 2015-0401
    Umfang p. 52-59.
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    ZDB-ID 1500517-3
    ISSN 0927-7757
    ISSN 0927-7757
    DOI 10.1016/j.colsurfa.2015.01.049
    Datenquelle NAL Katalog (AGRICOLA)

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  6. Artikel ; Online: Tumor loss-of-function mutations in STK11/LKB1 induce cachexia

    Puneeth Iyengar / Aakash Y. Gandhi / Jorge Granados / Tong Guo / Arun Gupta / Jinhai Yu / Ernesto M. Llano / Faya Zhang / Ang Gao / Asha Kandathil / Dorothy Williams / Boning Gao / Luc Girard / Venkat S. Malladi / John M. Shelton / Bret M. Evers / Raquibul Hannan / Chul Ahn / John D. Minna /
    Rodney E. Infante

    JCI Insight, Vol 8, Iss

    2023  Band 8

    Abstract: Cancer cachexia (CC), a wasting syndrome of muscle and adipose tissue resulting in weight loss, is observed in 50% of patients with solid tumors. Management of CC is limited by the absence of biomarkers and knowledge of molecules that drive its phenotype. ...

    Abstract Cancer cachexia (CC), a wasting syndrome of muscle and adipose tissue resulting in weight loss, is observed in 50% of patients with solid tumors. Management of CC is limited by the absence of biomarkers and knowledge of molecules that drive its phenotype. To identify such molecules, we injected 54 human non–small cell lung cancer (NSCLC) lines into immunodeficient mice, 17 of which produced an unambiguous phenotype of cachexia or non-cachexia. Whole-exome sequencing revealed that 8 of 10 cachexia lines, but none of the non-cachexia lines, possessed mutations in serine/threonine kinase 11 (STK11/LKB1), a regulator of nutrient sensor AMPK. Silencing of STK11/LKB1 in human NSCLC and murine colorectal carcinoma lines conferred a cachexia phenotype after cell transplantation into immunodeficient (human NSCLC) and immunocompetent (murine colorectal carcinoma) models. This host wasting was associated with an alteration in the immune cell repertoire of the tumor microenvironments that led to increases in local mRNA expression and serum levels of CC-associated cytokines. Mutational analysis of circulating tumor DNA from patients with NSCLC identified 89% concordance between STK11/LKB1 mutations and weight loss at cancer diagnosis. The current data provide evidence that tumor STK11/LKB1 loss of function is a driver of CC, simultaneously serving as a genetic biomarker for this wasting syndrome.
    Schlagwörter Metabolism ; Oncology ; Medicine ; R
    Sprache Englisch
    Erscheinungsdatum 2023-04-01T00:00:00Z
    Verlag American Society for Clinical investigation
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  7. Artikel ; Online: Somatic rearrangements causing oncogenic ectodomain deletions of FGFR1 in squamous cell lung cancer

    Florian Malchers / Lucia Nogova / Martijn H.A. van Attekum / Lukas Maas / Johannes Brägelmann / Christoph Bartenhagen / Luc Girard / Graziella Bosco / Ilona Dahmen / Sebastian Michels / Clare E. Weeden / Andreas H. Scheel / Lydia Meder / Kristina Golfmann / Philipp Schuldt / Janna Siemanowski / Jan Rehker / Sabine Merkelbach-Bruse / Roopika Menon /
    Oliver Gautschi / Johannes M. Heuckmann / Elisabeth Brambilla / Marie-Liesse Asselin-Labat / Thorsten Persigehl / John D. Minna / Henning Walczak / Roland T. Ullrich / Matthias Fischer / Hans Christian Reinhardt / Jürgen Wolf / Reinhard Büttner / Martin Peifer / Julie George / Roman K. Thomas

    The Journal of Clinical Investigation, Vol 133, Iss

    2023  Band 21

    Abstract: The discovery of frequent 8p11-p12 amplifications in squamous cell lung cancer (SQLC) has fueled hopes that FGFR1, located inside this amplicon, might be a therapeutic target. In a clinical trial, only 11% of patients with 8p11 amplification (detected by ...

    Abstract The discovery of frequent 8p11-p12 amplifications in squamous cell lung cancer (SQLC) has fueled hopes that FGFR1, located inside this amplicon, might be a therapeutic target. In a clinical trial, only 11% of patients with 8p11 amplification (detected by FISH) responded to FGFR kinase inhibitor treatment. To understand the mechanism of FGFR1 dependency, we performed deep genomic characterization of 52 SQLCs with 8p11-p12 amplification, including 10 tumors obtained from patients who had been treated with FGFR inhibitors. We discovered somatically altered variants of FGFR1 with deletion of exons 1–8 that resulted from intragenic tail-to-tail rearrangements. These ectodomain-deficient FGFR1 variants (ΔEC-FGFR1) were expressed in the affected tumors and were tumorigenic in both in vitro and in vivo models of lung cancer. Mechanistically, breakage-fusion-bridges were the source of 8p11-p12 amplification, resulting from frequent head-to-head and tail-to-tail rearrangements. Generally, tail-to-tail rearrangements within or in close proximity upstream of FGFR1 were associated with FGFR1 dependency. Thus, the genomic events shaping the architecture of the 8p11-p12 amplicon provide a mechanistic explanation for the emergence of FGFR1-driven SQLC. Specifically, we believe that FGFR1 ectodomain–deficient and FGFR1-centered amplifications caused by tail-to-tail rearrangements are a novel somatic genomic event that might be predictive of therapeutically relevant FGFR1 dependency.
    Schlagwörter Genetics ; Oncology ; Medicine ; R
    Sprache Englisch
    Erscheinungsdatum 2023-11-01T00:00:00Z
    Verlag American Society for Clinical Investigation
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  8. Artikel ; Online: Nonlinear Quantitative Radiation Sensitivity Prediction Model Based on NCI-60 Cancer Cell Lines

    Chunying Zhang / Luc Girard / Amit Das / Sun Chen / Guangqiang Zheng / Kai Song

    The Scientific World Journal, Vol

    2014  Band 2014

    Schlagwörter Science ; Q ; Science (General) ; Q1-390
    Erscheinungsdatum 2014-01-01T00:00:00Z
    Verlag Hindawi Publishing Corporation
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  9. Artikel ; Online: Nonlinear Quantitative Radiation Sensitivity Prediction Model Based on NCI-60 Cancer Cell Lines

    Chunying Zhang / Luc Girard / Amit Das / Sun Chen / Guangqiang Zheng / Kai Song

    The Scientific World Journal, Vol

    2014  Band 2014

    Abstract: We proposed a nonlinear model to perform a novel quantitative radiation sensitivity prediction. We used the NCI-60 panel, which consists of nine different cancer types, as the platform to train our model. Important radiation therapy (RT) related genes ... ...

    Abstract We proposed a nonlinear model to perform a novel quantitative radiation sensitivity prediction. We used the NCI-60 panel, which consists of nine different cancer types, as the platform to train our model. Important radiation therapy (RT) related genes were selected by significance analysis of microarrays (SAM). Orthogonal latent variables (LVs) were then extracted by the partial least squares (PLS) method as the new compressive input variables. Finally, support vector machine (SVM) regression model was trained with these LVs to predict the SF2 (the surviving fraction of cells after a radiation dose of 2 Gy γ-ray) values of the cell lines. Comparison with the published results showed significant improvement of the new method in various ways: (a) reducing the root mean square error (RMSE) of the radiation sensitivity prediction model from 0.20 to 0.011; and (b) improving prediction accuracy from 62% to 91%. To test the predictive performance of the gene signature, three different types of cancer patient datasets were used. Survival analysis across these different types of cancer patients strongly confirmed the clinical potential utility of the signature genes as a general prognosis platform. The gene regulatory network analysis identified six hub genes that are involved in canonical cancer pathways.
    Schlagwörter Science (General) ; Q1-390
    Thema/Rubrik (Code) 616
    Sprache Englisch
    Erscheinungsdatum 2014-01-01T00:00:00Z
    Verlag Hindawi Publishing Corporation
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  10. Artikel ; Online: Identification of Gene Expression Differences between Lymphangiogenic and Non-Lymphangiogenic Non-Small Cell Lung Cancer Cell Lines.

    Erin Regan / Robert C Sibley / Bercin Kutluk Cenik / Asitha Silva / Luc Girard / John D Minna / Michael T Dellinger

    PLoS ONE, Vol 11, Iss 3, p e

    2016  Band 0150963

    Abstract: It is well established that lung tumors induce the formation of lymphatic vessels. However, the molecular mechanisms controlling tumor lymphangiogenesis in lung cancer have not been fully delineated. In the present study, we identify a panel of non-small ...

    Abstract It is well established that lung tumors induce the formation of lymphatic vessels. However, the molecular mechanisms controlling tumor lymphangiogenesis in lung cancer have not been fully delineated. In the present study, we identify a panel of non-small cell lung cancer (NSCLC) cell lines that induce lymphangiogenesis and use genome-wide mRNA expression to characterize the molecular mechanisms regulating tumor lymphangiogenesis. We show that Calu-1, H1993, HCC461, HCC827, and H2122 NSCLC cell lines form tumors that induce lymphangiogenesis whereas Calu-3, H1155, H1975, and H2073 NSCLC cell lines form tumors that do not induce lymphangiogenesis. By analyzing genome-wide mRNA expression data, we identify a 17-gene expression signature that distinguishes lymphangiogenic from non-lymphangiogenic NSCLC cell lines. Importantly, VEGF-C is the only lymphatic growth factor in this expression signature and is approximately 50-fold higher in the lymphangiogenic group than in the non-lymphangiogenic group. We show that forced expression of VEGF-C by H1975 cells induces lymphangiogenesis and that knockdown of VEGF-C in H1993 cells inhibits lymphangiogenesis. Additionally, we demonstrate that the triple angiokinase inhibitor, nintedanib (small molecule that blocks all FGFRs, PDGFRs, and VEGFRs), suppresses tumor lymphangiogenesis in H1993 tumors. Together, these data suggest that VEGF-C is the dominant driver of tumor lymphangiogenesis in NSCLC and reveal a specific therapy that could potentially block tumor lymphangiogenesis in NSCLC patients.
    Schlagwörter Medicine ; R ; Science ; Q
    Thema/Rubrik (Code) 616
    Sprache Englisch
    Verlag Public Library of Science (PLoS)
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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