17 research outputs found
Involvement of p63 in the herpes simplex virus-1-induced demise of corneal cells
<p>Abstract</p> <p>Background</p> <p>The transcription factor p63 plays a pivotal role in the development and maintenance of epithelial tissues, including the ocular surface. In an effort to gain insight into the pathogenesis of keratitis caused by HSV-1, we determined the expression patterns of the p63 and Bax proteins in the Staatens Seruminstitute Rabbit Cornea cell line (SIRC).</p> <p>Methods</p> <p>SIRC cells were infected with HSV-1 at various multiplicities and maintained for different periods of time. Virus replication was measured by indirect immunofluorescence assay and Western blot analysis. Cell viability was determined by MTT assay. The apoptotic response of the infected cells was quantified by ELISA detecting the enrichment of nucleosomes in the cytoplasm. Western blot analysis was used to determine the levels of p63 and Bax proteins.</p> <p>Results</p> <p>Indirect immunofluorescence assays and Western blot analyses demonstrated the presence of HSV-1 glycoprotein D (gD) in the infected SIRC cell line, and the pattern of gD expression was consistent with efficient viral replication. The results of MTT and ELISA assays showed that HSV-1 elicited a strong cytopathic effect, and apoptosis played an important role in the demise of the infected cells. Mock-infected SIRC cells displayed the constitutive expression of ΔNp63α. The expressions of the Bax-β and TAp63γ isoforms were considerably increased, whereas the level of ΔNp63α was decreased in the HSV-1-infected SIRC cells. Experiments involving the use of acyclovir showed that viral DNA replication was necessary for the accumulation of TAp63γ.</p> <p>Conclusion</p> <p>These data suggest that a direct, virus-mediated cytopathic effect may play an important role in the pathogenic mechanism of herpetic keratitis. By disturbing the delicate balance between the pro-survival ΔN and the pro-apoptotic TA isoforms, HSV-1 may cause profound alterations in the viability of the ocular cells and in the tissue homeostasis of the ocular surface.</p
Can Triplet Loss Be Used for Multi-Label Few-Shot Classification? A Case Study
Few-shot learning is a deep learning subfield that is the focus of research nowadays. This paper addresses the research question of whether a triplet-trained Siamese network, initially designed for multi-class classification, can effectively handle multi-label classification. We conducted a case study to identify any limitations in its application. The experiments were conducted on a dataset containing Hungarian legal decisions of administrative agencies in tax matters belonging to a major legal content provider. We also tested how different Siamese embeddings compare on classifying a previously non-existing label on a binary and a multi-label setting. We found that triplet-trained Siamese networks can be applied to perform classification but with a sampling restriction during training. We also found that the overlap between labels affects the results negatively. The few-shot model, seeing only ten examples for each label, provided competitive results compared to models trained on tens of thousands of court decisions using tf-idf vectorization and logistic regression
Mondatszám-meghatározás hatása a magyar nyelvű jogi szövegek extraktĂv kivonatainak minĹ‘sĂ©gĂ©re
Az egyes dokumentumok tartalmi összefoglalása során a cĂ©l egy dokumentum rövidebb változatának előállĂtása Ăşgy, hogy annak fĹ‘ informáciĂłtartalma a kivonatban megĹ‘rzĹ‘djön. CikkĂĽnkben az anonimizált bĂrĂłsági határozatokhoz kĂ©szĂĽlt extraktĂv kivonatolĂł rendszer fejlesztĂ©se során szerzett tapasztalatokat ismertetjĂĽk, kĂĽlönös tekintettel a kivonatok hosszával (mondatszám) kapcsolatban felmerĂĽlt kĂ©rdĂ©sekre, Ă©s az azokra adott válaszainkra. A kivonatokkal egy jogi adatbázis felhasználĂłinak találati listában valĂł könnyebb orientáciĂłját kĂvántuk támogatni
Mondatszám-meghatározás hatása a magyar nyelvű jogi szövegek extraktĂv kivonatainak minĹ‘sĂ©gĂ©re
Az egyes dokumentumok tartalmi összefoglalása során a cĂ©l egy dokumentum rövidebb változatának előállĂtása Ăşgy, hogy annak fĹ‘ informáciĂłtartalma a kivonatban megĹ‘rzĹ‘djön. CikkĂĽnkben az anonimizált bĂrĂłsági határozatokhoz kĂ©szĂĽlt extraktĂv kivonatolĂł rendszer fejlesztĂ©se során szerzett tapasztalatokat ismertetjĂĽk, kĂĽlönös tekintettel a kivonatok hosszával (mondatszám) kapcsolatban felmerĂĽlt kĂ©rdĂ©sekre, Ă©s az azokra adott válaszainkra. A kivonatokkal egy jogi adatbázis felhasználĂłinak találati listában valĂł könnyebb orientáciĂłját kĂvántuk támogatni
Fehérjék konformációs dinamikája mint a biomolekuláris felismerés és jelátvitel meghatározó eleme = Protein conformational dynamics as a key determinant in biomolecular recognition and signal transmission
A tĂ©rszerkezet alapján, a konformáciĂłs dinamika figyelembevĂ©telĂ©vel kĂsĂ©reltĂĽk meg az intramolekuláris Ă©s molekulák közötti jelátvitel megĂ©rtĂ©sĂ©t atomi felbontással. KĂsĂ©rleti objektumok: a komplement rendszer, azon belĂĽl is a nemrĂ©g felfedezett lektin Ăşt fehĂ©rjekomplexei, a flagelláris exportrendszer valamint moduláris monomer, dimer Ă©s oligomer felĂ©pĂtĂ©sű enzimek álltak. MegállapĂtottuk, hogy FliI ATPáz, amely kĂ©pes az exportálandĂł fehĂ©rjĂ©je kitekerĂ©sĂ©re, a FliJ, FliH Ă©s FliS komponensekkel egyĂĽtt kĂ©pez olyan szupramolekuláris komplexet, amely kĂ©pes az export szubsztrátumok felismerĂ©sĂ©re. LeĂrtuk a foszfoglicerát kináz enzim alloszterikus működĂ©si mechanizmusát, atomi felbontással. Feltártuk az izopropilmalát dehidrogenáz molekuláris csuklĂłinak működĂ©sĂ©t Ă©s szerepĂ©t az alegysĂ©gek kölcsönhatásaiban. SzelektĂv inhibitorokkal a tankönyvi tĂ©zissel ellentĂ©tes felismerĂ©sre jutottunk, miszerint a komplement rendszer lektin Ăştjának meghatározĂł aktivátora a MASP-1 szerin proteáz. ĂŤgy a komplement aktiválással összefĂĽggĹ‘ betegsĂ©gek Ăşj gyĂłgyszercĂ©lpont molekuláját azonosĂtottuk. FelfedeztĂĽk, hogy a MASP-1 kĂ©pes a kininogĂ©n hasĂtása Ăştján, bradikinint felszabadĂtva, komplement fĂĽggĹ‘ gyulladást keltĂ©sĂ©re. FelfedeztĂĽk, hogy a trombinhoz hasonlĂłan a MASP-1, PAR-4 receptoron keresztĂĽl endotĂ©l sejteket aktivál. BizonyĂtĂ©kot találtunk arra, hogy a fehĂ©rjĂ©k konformáciĂłs dinamikája meghatározza a szerkezet evolĂşciĂłjának lehetsĂ©ges irányait, több milliárd Ă©ves idĹ‘skálán is. | The CUB2 domain of C1r without calcium has disordered structure. This flexibility, necessary for autocativation of C1r inside the C1 complex, is regulated by calcium. Using MASP-selective inhibitors we proved that, in contrast to the previous textbook picture, MASP-1 is the exclusive activator of MASP-2. Blocking the proteolytic activity of MASP-1 prevents activation of the lectin pathway, therefore MASP-1 is a new target in treating complement related diseases. We solved the structure of the catalytic region of MASP-1. The structure explains the special enzymatic characteristics of this complement protease. We discovered a new, inflammation related function of the complement system: MASP-1 is able to directly activate endothelial cells through cleaving protease activated receptor-4. We discovered that MASP-1 is able to cleave kininogen and liberates bradykinin. In this way MASP-1 can contribute to the local inflammatory reaction triggered by complement activation. The allosteric mechanismnof human PGK has been explored at atomic details. In the dimeric enzyme IPMDH structural and site-directed mutagenesis studies revealed the operation of the two main molecular hinges and their relationship with the subunit interactions. We have shown that conformational motions are linked to protein evolution by producing structural variants that can be evolutionarily stabilized. This process is exemplified by segment-swapped proteins, a new group of proteins discovered by us