7 research outputs found

    Restenosis and Therapy

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    The vascular disease involves imbalanced function of the blood vessels. Risk factors playing a role in development of impaired vessel functions will be briefly discussed. In ischemia/reperfusion (I/R), ischemic hypoxia is one of the cardinal risk factors of restenosis. Various insults are shown to initiate the phenotype switch of VSMCs. The pathological process, leading to activated inflammatory process, complement activation, and release of growth factors, initiate the proliferation of VSMCs in the media and cause luminal narrowing and impaired vascular function. The review summarizes the alteration process and demonstrates some of the clinical genetic background showing the role of complement and the genotypes of mannose-binding lectin (MBL2). Those could be useful markers of carotid restenosis after stent implantation. Gene therapy and therapeutic angiogenesis is proposed for therapy in restenosis. We suggest a drug candidate (iroxanadine), which ensures a noninvasive treatment by reverse regulation of the highly proliferating VSMCs and the disturbed function of ECs

    Disztrofin fehérjék a neuronokban és a glia sejtekben = Dystrophin proteins in neurons and glial cells

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    A disztrofin-disztroglikĂĄn komplexet (DGC) vizsgĂĄltuk neuronokban Ă©s glia sejtekben. TenyĂ©sztett MĂŒller glia sejtekben a 71 kDa-os disztrofin forma egyik splice-variĂĄnsĂĄnak (Dp71f) eloszlĂĄsa fĂŒggetlen a disztroglikĂĄntĂłl, mĂ­g az utrophin Ă©s a disztroglikĂĄn kolokalizĂĄciĂłt mutat. A fehĂ©rjĂ©k lokalizĂĄciĂłja Ă©s kolokalizĂĄciĂłs mintĂĄzata hasonlĂł nyugvĂł Ă©s vĂĄndorlĂł sejtekben, Ă©s nem vĂĄltozik meg laminin hĂĄtĂĄsĂĄra. A lamininnak a MĂŒller glia sejtekre gyakorolt motilitĂĄsnövelƑ hatĂĄsa jelentƑs rĂ©szben a laminin-DGC kölcsönhatĂĄs következmĂ©nye. A mozgĂł sejtek irĂĄnyvĂĄltoztatĂĄsi gyakorisĂĄga Ă©s a nyugvĂł sejtek nyĂșlvĂĄny-dinamizmusa nem fĂŒgg a laminin jelenlĂ©tĂ©tƑl. A hippocampus CA3 rĂ©giĂłjĂĄban a Dp71f kis aszimmetrikus szinapszisok posztszinaptikus elemĂ©ben, tovĂĄbbĂĄ a moharostok membrĂĄnjĂĄn Ă©s egyes kis ĂĄtmĂ©rƑjƱ myelinhĂŒvelyes axonokban van jelen. A Dp71f jelen van az asztrocitĂĄkban, a sejttestben Ă©s a nyĂșlvĂĄnyokban egyarĂĄnt. A fehĂ©rje a gliĂĄlis fibrillĂĄris proteint Ă©s laminint is expresszĂĄlĂł asztrocita populĂĄciĂłkban fordul elƑ. A laterĂĄlis hypothalamikus terĂŒlet egyes neuronjai alfa-disztrobrevint (a-DB) expresszĂĄlnak. Az a-DB pozitĂ­v neuronok melanin koncentrĂĄlĂł hormon immunreaktivitĂĄst mutatnak. Az a-DB a perikaryonokban Ă©s a nyĂșlvĂĄnyokban is jelen van. Az a-DB megjelenik a perivascularis glia vĂ©gtalpakban, ezen belĂŒl az endothel sejteket Ă©s vĂ©gtalpat elvĂĄlasztĂł lamina basalissal Ă©rintkezƑ membrĂĄnon lokalizĂĄlĂłdik. | Proteins of the dystrophin-associated glycoprotein complex have been localized by light and electronmicroscopic technique in neurons and glial cells. In primary cultures of retinal Muller glial cells the distribution of Dp71f, one of the splice variants of the 71 kDa dystrophin protein, has been shown to be independent of the distribution of dystroglycan, while utrophin and dystroglycan colocalized in clusters in all parts of the cells. The colocalization pattern was similar in resting and migrating cells and it was independent of the presence of laminin. The laminin-induced motility of Muller cells has been proven to be dependent on laminin-dystroglycan interaction. Dystroglycan function does not seem to be involved in the laminin-dependent increase of the direction-changing activity of the migrating cells and the process dynamism of the resting ones. Dp71f positivity has been demostrated in glial fibrillary acidic protein and laminin producing astrocytes. In the CA3 region of the hippocampus, Dp71f has been localized in the postsynaptic density of small asymmetric axospinous and axodendritic synapses. Furthermore, the protein was present on the membranes of the mossy fibers and in the axon proper of small-caliber myelinated axons. Alpha-dystrobrevin (a-DB) immunoreactivity was demonstrated on the endothelium-facing membrane of the perivascular astrocytes and in melanin-concentrating hormone producing neurons within the lateral hypothalamic area

    A szarvasmarha neonatalis Fc receptor (bFcRn) åltal mediålt IgG katabolizmus és epithelialis transzport molekulåris szintƱ elemzése = Studies on the bovine FcRn mediated IgG catabolism and epithelial transport at molecular level

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    A pĂĄlyĂĄzat rĂ©vĂ©n jelentƑsen bƑvĂ­tettĂŒk a szarvasmarha FcRn (bFcRn) szerepĂ©rƑl alkotott ismereteinket arrĂłl hogyan szabĂĄlyozza ez a receptor az IgG homeosztĂĄzisĂĄt. Egyik legfontosabb eredmĂ©nyĂŒnknek tartjuk, hogy tisztĂĄztuk a bFcRn szerepĂ©t tƑgy IgG transzport folyamatĂĄban. FelĂŒleti plazmon rezonancia elemzĂ©seinkkel kimutattuk, hogy a receptor lĂ©nyegesen nagyobb affinitĂĄssal kötƑdik a bovin IgG2, mint az IgG1 izotĂ­pushoz. A tejmirigyben kifejezƑdƑ bFcRn transzgenikus egerek elemzĂ©sĂ©vel pedig megĂĄllapĂ­tottuk, hogy a nagyobb mĂ©rtĂ©kƱ receptor kifejezƑdĂ©s jelentƑsen növeli az ĂĄllatok szĂ©rum IgG szintjĂ©t, Ă©s csak kismĂ©rtĂ©kben a tej IgG koncentrĂĄciĂłjĂĄt. E kĂ©t megfigyelĂ©s alapjĂĄn kijelenthetƑ, hogy a bFcRn a tƑgyben nem az IgG1-et szekretĂĄlja, hanem az IgG2-t juttatja vissza a keringĂ©sbe, megakadĂĄlyozza ennek az izotĂ­pusnak a tejbe törtĂ©nƑ kiĂŒrĂŒlĂ©sĂ©t. SzarvasmarhĂĄban vĂ©gzett IgG kiĂŒrĂŒlĂ©si vizsgĂĄlatainkkal megĂĄllapĂ­tottuk, hogy a bFcRn aktĂ­van közremƱködik az IgG lebomlĂĄsĂĄnak szabĂĄlyozĂĄsĂĄban. A bFcRn-t faj-specifikus, test szerte kifejezƑdƑ transzgenikus egerekben vĂ©gzett elemzĂ©seink kimutattĂĄk, hogy az FcRn kifejezƑdĂ©sĂ©nek fokozĂĄsa csökkenti az IgG lebomlĂĄsĂĄt Ă©s immunizĂĄlĂĄst követƑen fokozza az antigĂ©n specifikus B limfocitĂĄk termelƑdĂ©sĂ©t. Ennek köszönhetƑen ezeknek az ĂĄllatoknak az antigĂ©n specifikus ellenanyag termelĂ©se lĂ©nyegesen meghaladja a hagyomĂĄnyos ĂĄllatokĂ©t. Ez utĂłbbi felismerĂ©s gazdasĂĄgi hasznosĂ­tĂĄsĂĄra a kutatĂłk lĂ©trehoztĂĄk az ImmunoGenes Kft-et (www.immunogenes.com). | In the frame of this grant, we significantly extended our knowledge about the role of the bovine FcRn (bFcRn) in the IgG homeostasis. One of our most important results was to clarify the role of this receptor in the IgG transport during colostrum formation. By using surface plasmon resonance assay, we could show that the FcRn binds to bovine IgG2 at a much higher affinity as compared to the IgG1 isotype. Transgenic mice that express bFcRn exclusively in their mammary gland during lactation showed significantly higher serum IgG level, while the IgG concentration in the milk was only slightly increased. Based on these two observations, we concluded that the bFcRn recycles IgG2 to the blood from the mammary gland, instead of secreting IgG1 into colostrums/milk. Results on IgG clearance studies in cattle showed that the bFcRn plays an important role in IgG protection regulating its catabolism. Our other transgenic mice that express the bFcRn in species specific mode throughout the body showed reduced IgG catabolism and enhanced antigen specific B cell production upon immunization. Due to these two effects the antigen specific antibody production is significantly improved in these animals. Based on this latter observation researchers founded ImmunoGenes Kft (www.immunogenes.com) to execute a plan towards creating a profitable company

    Analysis and control of immobilized enzyme systems

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    Dystrophin splice variants are distinctly localized in the hippocampus

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    It has previously been demonstrated that Dp71, the most abundant dystrophin protein in the brain, is mainly localized in the postsynaptic densities. Here we show the localization of Dp71f, one of the splice variants of this protein, within the CA3 region of the hippocampus. Immunopositivity occurs in the postsynaptic density of small asymmetrical axospinous and axodendritic synapses, while it is absent in the postsynaptic densities of the axospinous synapses of the large mossy fiber terminals. Dp71f immunoreactivity was found to be attached to the membranes of the mossy fibers in the stratum lucidum of the CA3 area. In a certain population of thin myelinated axons the protein seems to be present within the axon proper. These data support the notion of a physiological role of Dp71f distinct from other dystrophin isoforms present in the central nervous system
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