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Avidin Ltd.

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AVIDIN Co., SONEAS Research Co. and Synaging SAS | Date: 2016-03-09

Our invention relates to novel enantiomer derivatives of 8-hydroxyquinoline derivatives with general formula (I) and (II) and the synthesis thereof and pharmaceutically acceptable salts and metal complexes thereof, and the medicinal and/or pharmaceutical compositions comprising these compounds. The essence of the subject matter of the invention relates to the fact that prior art discloses the biological effect and characteristics only of the racemic products, the novel enantiomer derivatives according to the invention appear in our application for the first. The subject matter of the invention furthermore relates to a novel, stereoselective synthesis for the preparation of the novel enantiomer derivatives according to the invention. The novel medicinal and/or pharmaceutical compositions comprising these enantiomers are suitable for the treatment of the named diseases, and the enanatiomers are used for manufacture of these compositions. These applications for manufacture of the compositions are also the subject matters of the invention. The compounds according to the invention can be used preferably as cytoprotective, neuroprotective, cardioprotective, anxiolytic and antidepressant agent for treatment of neuropsychiatric and neurologic diseases and diseases in connections with transplantations and with ischemia and reperfusion injuries thereof, and inhibition of organ, advantageously skin graft rejection. According to our studies the R-enantiomer has either sole or high biological effect in some cases.

Szebeni G.J.,Avidin Ltd. | Szebeni G.J.,Synaptogenex Ltd. | Vizler C.,Hungarian Academy of Sciences | Kitajka K.,Hungarian Academy of Sciences | And 2 more authors.
Mediators of Inflammation | Year: 2017

One of the hallmarks of cancer-related inflammation is the recruitment of monocyte-macrophage lineage cells to the tumor microenvironment. These tumor infiltrating myeloid cells are educated by the tumor milieu, rich in cancer cells and stroma components, to exert functions such as promotion of tumor growth, immunosuppression, angiogenesis, and cancer cell dissemination. Our review highlights the ontogenetic diversity of tumor-associated macrophages (TAMs) and describes their main phenotypic markers. We cover fundamental molecular players in the tumor microenvironment including extra- (CCL2, CSF-1, CXCL12, IL-4, IL-13, semaphorins, WNT5A, and WNT7B) and intracellular signals. We discuss how these factors converge on intracellular determinants (STAT3, STAT6, STAT1, NF-B, RORC1, and HIF-1α) of cell functions and drive the recruitment and polarization of TAMs. Since microRNAs (miRNAs) modulate macrophage polarization key miRNAs (miR-146a, miR-155, miR-125a, miR-511, and miR-223) are also discussed in the context of the inflammatory myeloid tumor compartment. Accumulating evidence suggests that high TAM infiltration correlates with disease progression and overall poor survival of cancer patients. Identification of molecular targets to develop new therapeutic interventions targeting these harmful tumor infiltrating myeloid cells is emerging nowadays. © 2017 Gabor J. Szebeni et al.

Kata D.,University of Szeged | Foldesi I.,University of Szeged | Feher L.Z.,Avidin Ltd. | Hackler L.,Avidin Ltd. | And 2 more authors.
Neuroscience | Year: 2016

Microglial activation results in profound morphological, functional and gene expression changes that affect the pro- and anti-inflammatory mechanisms of these cells. Although statins have beneficial effects on inflammation, they have not been thoroughly investigated for their ability to affect microglial functions. Therefore the effects of rosuvastatin, one of the most commonly prescribed drugs in cardiovascular therapy, either alone or in combination with bacterial lipopolysaccharide (LPS), were profiled in pure microglial cultures derived from the forebrains of 18-day-old rat embryos. To reveal the effects of rosuvastatin on a number of pro- and anti-inflammatory mechanisms, we performed morphometric, functional and gene expression studies relating to cell adhesion and proliferation, phagocytosis, pro- and anti-inflammatory cytokine (IL-1β, tumor necrosis factor α (TNF-α) and IL-10, respectively) production, and the expression of various inflammation-related genes, including those related to the above morphological parameters and cellular functions. We found that microglia could be an important therapeutic target of rosuvastatin. In unchallenged (control) microglia, rosuvastatin inhibited proliferation and cell adhesion, but promoted microspike formation and elevated the expression of certain anti-inflammatory genes (Cxcl1, Ccl5, Mbl2), while phagocytosis or pro- and anti-inflammatory cytokine production were unaffected. Moreover, rosuvastatin markedly inhibited microglial activation in LPS-challenged cells by affecting both their morphology and functions as it inhibited LPS-elicited phagocytosis and inhibited pro-inflammatory cytokine (IL-1β, TNF-α) production, concomitantly increasing the level of IL-10, an anti-inflammatory cytokine. Finally, rosuvastatin beneficially and differentially affected the expression of a number of inflammation-related genes in LPS-challenged cells by inhibiting numerous pro-inflammatory and stimulating several anti-inflammatory genes. Since the microglia could elicit pro-inflammatory responses leading to neurodegeneration, it is important to attenuate such mechanisms and promote anti-inflammatory properties, and develop prophylactic therapies. By beneficially regulating both pro- and anti-inflammatory microglial functions, rosuvastatin may be considered as a prophylactic agent in the prevention of inflammation-related neurological disorders. © 2015 The Authors.

Korpos E.,University of Munster | Deak F.,Hungarian Academy of Sciences | Deak F.,Avidin Ltd. | Kiss I.,Hungarian Academy of Sciences | Kiss I.,Avidin Ltd.
Neural Regeneration Research | Year: 2015

The extracellular matrix (ECM) performs essential functions in the differentiation, maintenance and remodeling of tissues during development and regeneration, and it undergoes dynamic changes during remodeling concomitant to alterations in the cell-ECM interactions. Here we discuss recent data addressing the critical role of the widely expressed ECM protein, matrilin-2 (Matn2) in the timely onset of differentiation and regeneration processes in myogenic, neural and other tissue sand in tumorigenesis. As a multi adhesion adaptor protein, it interacts with other ECM proteins and integrins. Matn2 promotes neurite outgrowth, Schwann cell migration, neuromuscular junction formation, skeletal muscle and liver regeneration and skin wound healing. Matn2 deposition by myoblasts is crucial for the timely induction of the global switch toward terminal myogenic differentiation during muscle regeneration by affecting transforming growth factor beta/bone morphogenetic protein 7/Smad and other signal transduction pathways. Depending on the type of tissue and the pathomechanism, Matn2 can also promote or suppress tumor growth. © 2015, Editorial Board of Neural Regeneration Research. All rights reserved.

Kurti L.,Hungarian Academy of Sciences | Kurti L.,University of Szeged | Veszelka S.,Hungarian Academy of Sciences | Bocsik A.,Hungarian Academy of Sciences | And 6 more authors.
Toxicology in Vitro | Year: 2012

Sucrose esters are effective solubilizers and there is an interest to use them as pharmaceutical excipients for nasal drug delivery. We have determined for the first time the non-toxic doses of laurate and myristate sucrose esters by four independent methods, and their effects on epithelial permeability using RPMI 2650 human nasal epithelial cell line. Based on real-time cell electronic sensing, MTT dye conversion and lactate dehydrogenase release methods reference surfactant Cremophor RH40 proved to be the least toxic excipient, and could be used at 5. mg/mL concentration for 1. h in epithelial cells without cellular damage. The non-toxic dose of Tween 80 was 1. mg/mL, while the dose of laurate and myristate sucrose esters that could be safely used on cells for 1. h was 0.1. mg/mL. Both the reference surfactants and the sucrose esters significantly enhanced the permeability of epithelial cell layers for the paracellular marker FITC-labelled 4.4. kDa dextran at 0.1. mg/mL concentration. The effects of sucrose esters on epithelial permeability were dose-dependent. These data indicate that laurate and myristate sucrose esters can be potentially used as permeability enhancers in nasal formulations to augment drug delivery to the systemic circulation. © 2012 Elsevier Ltd.

Kiss L.,Hungarian Academy of Sciences | Kiss L.,University of Szeged | Walter F.R.,Hungarian Academy of Sciences | Bocsik A.,Hungarian Academy of Sciences | And 6 more authors.
Journal of Pharmaceutical Sciences | Year: 2013

Cremophor EL and RH40 are widely used excipients in oral and intravenous drug formulations such as Taxol infusion to improve drug dissolution and absorption. Studies indicate that Cremophors, especially EL, have toxic side effects, but few data are available on endothelial and epithelial cells, which form biological barriers and are directly exposed to these molecules. Human hCMEC/D3 brain endothelial and Caco-2 epithelial cells were treated with Cremophor EL and RH40 in the 0.1-50mg/mL concentration range. Cell toxicity was monitored by real-time cell microelectronic sensing and verified by lactate dehydrogenase release and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assays, and morphological methods. Cremophors caused dose- and time-dependent damage in both cell types. In endothelial cells, 0.1mg/mL and higher concentrations, in epithelial cells, concentrations of 5mg/mL and above were toxic, especially at longer incubations. Cell death was also proven by double fluorescent staining of cell nuclei. Immunostaining for tight junction proteins claudin-4 and -5 showed barrier disruption in cells treated by surfactants at 24h. In conclusion, Cremophor EL and RH40 in concentrations corresponding to clinical doses caused endothelial and epithelial toxicity. Endothelial cells were more sensitive to surfactant treatment than epithelial cells, and Cremophor EL was more toxic than RH40 in both cell types. © 2013 Wiley Periodicals, Inc.

Barbai T.,Semmelweis University | Fejos Z.,Semmelweis University | Puskas L.G.,Avidin Ltd. | Timar J.,Semmelweis University | And 3 more authors.
Oncotarget | Year: 2015

We have attempted to characterize the changes occurring on the host side during the progression of human melanoma. To investigate the role of tumor microenvironment, we set up such an animal model, which was able to isolate the host related factors playing central role in metastasis formation. One of these 'factors', CCL12, was consequently selected and its behavior was examined alongside its human homologue (CCL8). In our animal model, metastasis forming primary melanoma in the host exhibited increased level of CCL12 mRNA expression. In clinical samples, when examining the tumor and the host together, the cumulative (tumor and host) CCL8 expression was lower in the group in which human primary melanoma formed lung metastasis compared to non-metastatic primary tumors. We could not detect significant difference in CCL8 receptor (CCR1) expression between the two groups. Increased migration of the examined tumor cell lines was observed when CCL8 was applied as a chemoattractant. The tumor cells and their interactions can be influenced the expression of CCL8 by dermal fibroblasts, as a significant change in the metastatic microenvironment. Furthermore, we examined changes in miRNA profile resulted by CCL8 and miR146a appears to be a promising prognostic marker for following this process.

Molnar G.,Hungarian Academy of Sciences | Farago N.,Hungarian Academy of Sciences | Kocsis A.K.,Hungarian Academy of Sciences | Rozsa M.,Hungarian Academy of Sciences | And 8 more authors.
Journal of Neuroscience | Year: 2014

Concentrations of insulin in the brain are severalfold higher than blood plasma levels. Insulin in the brain regulates the metabolism, molecular composition, and cognitive performance of microcircuits and reduces food intake; cerebral insulin levels are altered in diabetes, aging, obesity, and Alzheimer's disease. Released by pancreatic β cells, insulin passes the blood- brain barrier, but sources of locally released insulin still remain unclear. We find that insulin is strongly expressed in GABAergic neurogliaform cells in the cerebral cortex of the rat detected by single-cell digital PCR. Focal application of glucose or glibenclamide to neurogliaform cells mimics the excitation suppressing effect of external insulin on local microcircuits via insulin receptors. Thus, neurogliaform cells might link GABAergic and insulinergic action in cortical microcircuits. © 2014 the authors.

Gyuris M.,Avidin Ltd | Gyuris M.,University of Szeged | Puskas L.G.,Avidin Ltd | Toth G.K.,University of Szeged | Kanizsai I.,Avidin Ltd
Organic and Biomolecular Chemistry | Year: 2013

Pyrazole-based β-aminonitriles and β-amino-carbaldehydes as bifunctional building blocks are introduced in a facile copper(ii)-catalysed one-pot domino generation of multiple N-containing heterobi- and tricycles. This streamlined synthetic approach permits easy access to novel pyrazole-fused imidazo- and pyrimido[1,2-c]pyrimidinones and to pyrazolo[3,4-d]pyrimidinone species with isolated yields up to 90%. The present study also reveals a unique amine-isocyanate coupling promotion via copper(ii)-based catalytic activation. © 2013 The Royal Society of Chemistry.

Hackler Jr. L.,Avidin Ltd | Masuda T.,Wilmer Eye Institute | Oliver V.F.,Wilmer Eye Institute | Merbs S.L.,Wilmer Eye Institute | Zack D.J.,Wilmer Eye Institute
Methods in Molecular Biology | Year: 2012

Laser capture microdissection (LCM) is a useful method to isolate specific cells or cell layers of interest from heterogeneous tissues, such as the retina. The collected cells can be used for DNA, RNA, or protein analysis. We have applied LCM technology to isolate cells from the outer nuclear, inner nuclear, and ganglion cell layers of the retina for mRNA and microRNA (miRNA) expression and epigenetic (DNA methylation) analysis. Here, we describe the methods we have employed for sample preparation, LCM-based isolation of retinal layers, RNA/DNA extraction, RNA quality check, microRNA analysis by quantitative PCR, and DNA methylation analysis by bisulfite sequencing. © 2012 Springer Science+Business Media, LLC.

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