1,877 research outputs found
Polimorfismos del gen CLEC7A y riesgo de infección fúngica
Memoria del trabajo de investigación para optar al Título de Máster en Investigación Biomédica presentado por Cristina de Ramón Sánchez en la Universidad de Valladolid, Instituto de Biología y Genética Molecular (IBGM), Dpto. Daño tisular inmune e Inmunidad Innata.Los pacientes con enfermedades oncohematológicas tienen mayor riesgo de padecer infecciones fúngicas que la población general debido a la inmunosupresión producida por la propia enfermedad y a los efectos indeseables de los tratamientos que reciben. Esta combinación de factores de riesgo implica altas tasas de comorbilidad y mortalidad por lo que sería necesario establecer estrategias de prevención estandarizadas y fundamentadas en estudios con evidencia científica. Las infecciones fúngicas más frecuentes son las producidas por Aspergillus en el caso de los pacientes sometidos a trasplante de médula y por Candida en situaciones más convencionales, aunque infecciones por Cryptococcus y Pneumocystis jiroveci no son inusuales.Peer Reviewe
Polimorfismos del gen CLEC7A y riesgo de infección fúngica
Los pacientes con enfermedades oncohematológicas tienen mayor riesgo de padecer infecciones fúngicas que la población general debido a la inmunosupresión producida por la propia enfermedad y a los efectos indeseables de los tratamientos que reciben. Esta combinación de factores de riesgo implica altas tasas de comorbilidad y mortalidad por lo que sería necesario establecer estrategias de prevención estandarizadas y fundamentadas en estudios con evidencia científica.
Las infecciones fúngicas más frecuentes son las producidas por Aspergillus en el caso de los pacientes sometidos a trasplante de médula y por Candida en situaciones más convencionales, aunque infecciones por Cryptococcus y Pneumocystis jiroveci no son inusuales.Máster en Investigación Biomédic
PHF2 regulates homology-directed DNA repair by controlling the resection of DNA double strand breaks
Post-translational histone modifications and chromatin remodelling play a critical role controlling the integrity of the genome. Here, we identify histone lysine demethylase PHF2 as a novel regulator of the DNA damage response by regulating DNA damage-induced focus formation of 53BP1 and BRCA1, critical factors in the pathway choice for DNA double strand break repair. PHF2 knockdown leads to impaired BRCA1 focus formation and delays the resolution of 53BP1 foci. Moreover, irradiation-induced RPA phosphorylation and focus formation, as well as localization of CtIP, required for DNA end resection, to sites of DNA lesions are affected by depletion of PHF2. These results are indicative of a defective resection of double strand breaks and thereby an impaired homologous recombination upon PHF2 depletion. In accordance with these data, Rad51 focus formation and homology-directed double strand break repair is inhibited in cells depleted for PHF2. Importantly, we demonstrate that PHF2 knockdown decreases CtIP and BRCA1 protein and mRNA levels, an effect that is dependent on the demethylase activity of PHF2. Furthermore, PHF2-depleted cells display genome instability and are mildly sensitive to the inhibition of PARP. Together these results demonstrate that PHF2 promotes DNA repair by homologous recombination by controlling CtIP-dependent resection of double strand breaks.España Ministerio de Ciencia e Innovacion SAF2016-80626-REspaña, Fundación Canaria Instituto de Investigación Sanitaria de Canarias (FIISC) [PIFUN16/18
Internal translation of the connexin 43 transcript
Connexin 43 (Cx43), the most widely expressed gap junction protein, is associated with a number of physiological and pathological conditions. Many functions of Cx43 have been shown to be independent of gap junction formation and only require the expression of Cx43 C-terminal fragments. Recent evidence demonstrated that naturally occurring C-terminal isoforms can be generated via internal translation. Here, we confirm that C-terminal domains of Cx43, particularly the major 20-kDa isoform, can be independently generated and regulated by internal translation of the same single GJA1 gene transcript that encodes full-length Cx43. Through direct RNA transfection experiments, we provide evidence that internal translation is not due to a bona fide cap-independent IRES-mediated mechanism, as upstream ribosomal scanning or translation is required. In addition to the mTOR pathway, we show for the first time, using both inhibitors and cells from knockout mice, that the Mnk1/2 pathway regulates the translation of the main 20-kDa isoform. Internal translation of the Cx43 transcript occurs but is not cap-independent and requires translation upstream of the internal start codon. In addition to the PI3K/AKT/mTOR pathway, the major 20-kDa isoform is regulated by the Mnk1/2 pathway. Our results have major implications for past and future studies escribing gap junction-independent functions of Cx43 in cancer and other pathological conditions. This study provides further clues to the signalling pathways that regulate internal mRNA translation, an emerging mechanism that allows for increased protein diversity and functional complexity from a single mRNA transcript
Differences in osteogenic and apoptotic genes between osteoporotic and osteoarthritic patients
Nanoparticle-cell-nanoparticle communication by stigmergy to enhance poly(I:C) induced apoptosis in cancer cells
[EN] Nanoparticle-cell-nanoparticle communication by stigmergy was demonstrated using two capped nanodevices. The first community of nanoparticles (i.e.S(RA)(IFN)) is loaded with 9-cis-retinoic acid and capped with interferon-gamma, whereas the second community of nanoparticles (i.e.S(sulf)(PIC)) is loaded with sulforhodamine B and capped with poly(I:C). The uptake ofS(RA)(IFN)by SK-BR-3 breast cancer cells enhanced the expression of TLR3 receptor facilitating the subsequent uptake ofS(sulf)(PIC)and cell killing.We thank the Spanish Government (projects RTI2018-100910-B-C41 and RTI2018-101599-B-C22 (MCUI/FEDER, EU)), Generalitat Valenciana (project PROMETEO2018/024) and CIBER-BBN (project NANOCOMMUNITY) for support. A. U. and C. G are grateful to the Ministry of Education, Culture and Sport for her doctoral FPU grant.Ultimo, A.; De La Torre-Paredes, C.; Giménez, C.; Aznar, E.; Coll, C.; Marcos Martínez, MD.; Murguía, JR.... (2020). Nanoparticle-cell-nanoparticle communication by stigmergy to enhance poly(I:C) induced apoptosis in cancer cells. Chemical Communications. 56(53):7273-7276. https://doi.org/10.1039/d0cc02795bS727372765653Schaming, D., & Remita, H. (2015). Nanotechnology: from the ancient time to nowadays. Foundations of Chemistry, 17(3), 187-205. doi:10.1007/s10698-015-9235-yHauert, S., & Bhatia, S. N. (2014). Mechanisms of cooperation in cancer nanomedicine: towards systems nanotechnology. Trends in Biotechnology, 32(9), 448-455. doi:10.1016/j.tibtech.2014.06.010Theraulaz, G., & Bonabeau, E. (1999). A Brief History of Stigmergy. Artificial Life, 5(2), 97-116. doi:10.1162/106454699568700Llopis-Lorente, A., Díez, P., Sánchez, A., Marcos, M. D., Sancenón, F., Martínez-Ruiz, P., … Martínez-Máñez, R. (2017). Interactive models of communication at the nanoscale using nanoparticles that talk to one another. Nature Communications, 8(1). doi:10.1038/ncomms15511Luis, B., Llopis‐Lorente, A., Rincón, P., Gadea, J., Sancenón, F., Aznar, E., … Martínez‐Máñez, R. (2019). An Interactive Model of Communication between Abiotic Nanodevices and Microorganisms. Angewandte Chemie International Edition, 58(42), 14986-14990. doi:10.1002/anie.201908867De la Torre, C., Domínguez-Berrocal, L., Murguía, J. R., Marcos, M. D., Martínez-Máñez, R., Bravo, J., & Sancenón, F. (2018). ϵ
-Polylysine-Capped Mesoporous Silica Nanoparticles as Carrier of the C
9h
Peptide to Induce Apoptosis in Cancer Cells. Chemistry - A European Journal, 24(8), 1890-1897. doi:10.1002/chem.201704161García-Fernández, A., García-Laínez, G., Ferrándiz, M. L., Aznar, E., Sancenón, F., Alcaraz, M. J., … Orzáez, M. (2017). Targeting inflammasome by the inhibition of caspase-1 activity using capped mesoporous silica nanoparticles. Journal of Controlled Release, 248, 60-70. doi:10.1016/j.jconrel.2017.01.002Murugan, C., Rayappan, K., Thangam, R., Bhanumathi, R., Shanthi, K., Vivek, R., … Kannan, S. (2016). Combinatorial nanocarrier based drug delivery approach for amalgamation of anti-tumor agents in breast cancer cells: an improved nanomedicine strategy. Scientific Reports, 6(1). doi:10.1038/srep34053Van Rijt, S. H., Bölükbas, D. A., Argyo, C., Datz, S., Lindner, M., Eickelberg, O., … Meiners, S. (2015). Protease-Mediated Release of Chemotherapeutics from Mesoporous Silica Nanoparticles to ex Vivo Human and Mouse Lung Tumors. ACS Nano, 9(3), 2377-2389. doi:10.1021/nn5070343Llopis-Lorente, A., Lozano-Torres, B., Bernardos, A., Martínez-Máñez, R., & Sancenón, F. (2017). Mesoporous silica materials for controlled delivery based on enzymes. Journal of Materials Chemistry B, 5(17), 3069-3083. doi:10.1039/c7tb00348jBianchi, F., Pretto, S., Tagliabue, E., Balsari, A., & Sfondrini, L. (2017). Exploiting poly(I:C) to induce cancer cell apoptosis. Cancer Biology & Therapy, 18(10), 747-756. doi:10.1080/15384047.2017.1373220Ultimo, A., Giménez, C., Bartovsky, P., Aznar, E., Sancenón, F., Marcos, M. D., … Murguía, J. R. (2016). Targeting Innate Immunity with dsRNA-Conjugated Mesoporous Silica Nanoparticles Promotes Antitumor Effects on Breast Cancer Cells. Chemistry - A European Journal, 22(5), 1582-1586. doi:10.1002/chem.201504629Bernardo, A. R., Cosgaya, J. M., Aranda, A., & Jiménez-Lara, A. M. (2013). Synergy between RA and TLR3 promotes type I IFN-dependent apoptosis through upregulation of TRAIL pathway in breast cancer cells. Cell Death & Disease, 4(1), e479-e479. doi:10.1038/cddis.2013.5Clarke, N., Jimenez-Lara, A. M., Voltz, E., & Gronemeyer, H. (2004). Tumor suppressor IRF-1 mediates retinoid and interferon anticancer signaling to death ligand TRAIL. The EMBO Journal, 23(15), 3051-3060. doi:10.1038/sj.emboj.7600302Kajita, A. i., Morizane, S., Takiguchi, T., Yamamoto, T., Yamada, M., & Iwatsuki, K. (2015). Interferon-Gamma Enhances TLR3 Expression and Anti-Viral Activity in Keratinocytes. Journal of Investigative Dermatology, 135(8), 2005-2011. doi:10.1038/jid.2015.125Weihua, X., Kolla, V., & Kalvakolanu, D. V. (1997). Modulation of Interferon Action by Retinoids. Journal of Biological Chemistry, 272(15), 9742-9748. doi:10.1074/jbc.272.15.974
Polyglutamic Acid-Gated Mesoporous Silica Nanoparticles for Enzyme-Controlled Drug Delivery
This document is the Accepted Manuscript version of a Published Work that appeared in final form in
Langmuir, copyright © American Chemical Society after peer review and technical editing by the publisher.
To access the final edited and published work see http://dx.doi.org/10.1021/acs.langmuir.6b01715.Mesoporous silica nanoparticles (MSNs) are highly
attractive as supports in the design of controlled delivery systems
that can act as containers for the encapsulation of therapeutic agents,
overcoming common issues such as poor water solubility and poor
stability of some drugs and also enhancing their bioavailability. In
this context, we describe herein the development of polyglutamic
acid (PGA)-capped MSNs that can selectively deliver rhodamine B
and doxorubicin. PGA-capped MSNs remain closed in an aqueous
environment, yet they are able to deliver the cargo in the presence of
pronase because of the hydrolysis of the peptide bonds in PGA. The
prepared solids released less than 20% of the cargo in 1 day in water,
whereas they were able to reach 90% of the maximum release of the
entrapped guest in ca. 5 h in the presence of pronase. Studies of the
PGA-capped nanoparticles with SK-BR-3 breast cancer cells were
also undertaken. Rhodamine-loaded nanoparticles were not toxic, whereas doxorubicin-loaded nanoparticles were able to
efficiently kill more than 90% of the cancer cells at a concentration of 100 μg/mL.A.T. wishes to express her gratitude to the Erasmus mundus (Svagata.eu) financial support. A.U. and C. de la T. are grateful to the Spanish Ministry of Education, Culture and Sport for her doctoral fellowship. We thank the Spanish Government (Project MAT2015-64139-C4-1-R, MINECO/FEDER) and Generalitat Valenciana (Project PROMETEOII/2014/047) for their support. The authors also thank UPV electron microscopy services for the technical support.Tukappa, A.; Ultimo, A.; De La Torre Paredes, C.; Pardo Vicente, MT.; Sancenón Galarza, F.; Martínez-Máñez, R. (2016). Polyglutamic Acid-Gated Mesoporous Silica Nanoparticles for Enzyme-Controlled Drug Delivery. Langmuir. 32(33):8507-8515. https://doi.org/10.1021/acs.langmuir.6b01715S85078515323
Growth, crystal structure, Hirshfeld surface analysis, DFT studies, physicochemical characterization, and cytotoxicity assays of novel organic triphosphate
[EN] A novel organic-inorganic hybrid compound, named (1-phenylpiperazinium) trihydrogen triphosphate, with the formula-(C10H15N2)(2)H3P3O10 has been obtained by low speed of evaporation of a mixture of an alcoholic solution of 1-phenylpiperazine and triphosphoric acid H5P3O10 at room temperature after using the ion exchange chemical procedure. To carry out a detailed crystallographic structure analysis, single-crystal X-ray diffraction has been reported. In the molecular arrangement, the different entities are held together through N-(HO)-O-center dot center dot center dot, O-(HO)-O-center dot center dot center dot, and C-(HO)-O-center dot center dot center dot hydrogen bonds, building up a three-dimensional packing. Powder X-ray diffraction analysis is acquired to confirm the purity of the product. The nature and the proportion of intermolecular interactions were investigated by Hirshfeld surface analysis. In order to support the experimental results, a density functional theory (DFT) calculation was performed, using the Becke-3-parameter-Lee-Yang-Parr (B3LYP) function with LANL2DZ basis set, and the data indicate much agreement between the experimental and the theoretical results. Thus, the physicochemical properties were studied employing a variety of techniques (FTIR, NMR, UV-visible, and photoluminescence). To get an insight of the possible employment of the present material in biology, cell viability assays were performed.This work is supported by the Tunisian National Ministry of Higher Education and Scientific Research.Oueslati, Y.; Kansiz, S.; Dege, N.; De La Torre Paredes, C.; Llopis-Lorente, A.; Martínez-Máñez, R.; Sta, WS. (2022). Growth, crystal structure, Hirshfeld surface analysis, DFT studies, physicochemical characterization, and cytotoxicity assays of novel organic triphosphate. 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