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Szeged, Hungary

Molnar E.,Hungarian Academy of Sciences | Molnar E.,AVICOR Ltd. | Kuntam S.,Hungarian Academy of Sciences | Cingaram P.K.R.,Hungarian Academy of Sciences | And 10 more authors.
Molecules | Year: 2013

Discovering new fluorochromes is significantly advanced by high-throughput screening (HTS) methods. In the present study a combination of small molecule microarray (SMM) prescreening and confocal laser scanning microscopy (CLSM) was developed in order to discover novel cell staining fluorescent dyes. Compounds with high native fluorescence were selected from a 14,585-member library and further tested on living cells under the microscope. Eleven compartment- specific, cell-permeable (or plasma membrane-targeted) fluorochromes were identified. Their cytotoxicity was tested and found that between 1-10 micromolar range, they were non-toxic even during long-term incubations. © 2013 by the authors; licensee MDPI, Basel, Switzerland.

Korkmaz S.,University of Heidelberg | Barnucz E.,University of Heidelberg | Barnucz E.,Semmelweis University | Loganathan S.,University of Heidelberg | And 20 more authors.
Circulation Journal | Year: 2013

Background: Reperfusion of ischemic myocardium may contribute to substantial cardiac tissue damage, but the addition of iron chelators, zinc or zinc complexes has been shown to prevent heart from reperfusion injury. We investigated the possible beneficial effects of an iron-chelating and zinc-complexing agent, Q50, in rat models of ischemia/reperfusion (I/R)-induced myocardial infarction and on global reversible myocardial I/R injury after heart transplantation. Methods and Results: Rats underwent 45-min myocardial ischemia by left anterior descending coronary artery ligation followed by 24 h reperfusion. Vehicle or Q50 (10 mg/kg, IV) were given 5 min before reperfusion. In a heart transplantation model, donor rats received vehicle or Q50 (30 mg/kg, IV) 1 h before the onset of ischemia. In myocardial infarcted rats, increased left ventricular end-systolic and end-diastolic volumes were significantly decreased by Q50 post treatment as compared with the sham group. Moreover, in I/R rat hearts, the decreased dP/dtmax and load-independent contractility parameters were significantly increased after Q50. However, Q50 treatment did not reduce infarct size or have any effect on increased plasma cardiac troponin-T-levels. In the rat model of heart transplantation, 1 h after reperfusion, decreased left ventricular systolic pressure, dP/dtmax, dP/dtmin and myocardial ATP content were significantly increased and myocardial protein expression of superoxide dismutase-1 was upregulated after Q50 treatment. Conclusions: In 2 experimental models of I/R, administration of Q50 improved myocardial function. Its mechanisms of action implicate in part the restoration of myocardial high-energy phosphates and upregulation of antioxidant enzymes. (Circ J 2013; 77: 1817 - 1826).

Hackler L.,Avidin Ltd. | Ozsvari B.,Avidin Ltd. | Gyuris M.,Avidin Ltd. | Sipos P.,University of Szeged | And 13 more authors.
PLoS ONE | Year: 2016

C-150 a Mannich-type curcumin derivative, exhibited pronounced cytotoxic effects against eight glioma cell lines at micromolar concentrations. Inhibition of cell proliferation by C-150 was mediated by affecting multiple targets as confirmed at transcription and protein level. C-150 effectively reduced the transcription activation of NFkB, inhibited PKC-alpha which are constitutively over-expressed in glioblastoma. The effects of C-150 on the Akt/Notch signaling were also demonstrated in a Drosophila tumorigenesis model. C-150 reduced the number of tumors in Drosophila with similar efficacy to mitoxantrone. In an in vivo orthotopic glioma model, C-150 significantly increased the median survival of treated nude rats compared to control animals. The multi-target action of C-150, and its preliminary in vivo efficacy would render this curcumin analogue as a potent clinical candidate against glioblastoma. © 2016 Hackler et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Gyuris M.,Avidin Ltd. | Gyuris M.,University of Szeged | Madacsi R.,AVICOR Ltd. | Madacsi R.,University of Szeged | And 5 more authors.
European Journal of Organic Chemistry | Year: 2011

An efficient, one-pot domino synthesis of new 2-amino-3-cyano-4H-chromene- 4-carboxamide derivatives has been developed by the acid-induced conjugate addition of isocyanides to 2-imino-2H-chromene-3-carboxamides, followed by an intramolecular O-trapping rearrangement, with yields up to 92%. This newly established protocol was also used in multicomponent (3CR) mode. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Nagy L.I.,Avidin Ltd. | Molnar E.,AVICOR Ltd. | Kanizsai I.,Avidin Ltd. | Madacsi R.,Avidin Ltd. | And 16 more authors.
Lipids in Health and Disease | Year: 2013

Background: Hepatocellular carcinoma (HCC) is the most frequent and aggressive primary tumor of the liver and it has limited treatment options. Results: In this study, we report the in vitro and in vivo effects of two novel amino-trifluoro-phtalimide analogs, Ac-915 and Ac-2010. Both compounds bind lipid droplets and endoplasmic reticulum membrane, and interact with several proteins with chaperone functions (HSP60, HSP70, HSP90, and protein disulfide isomerase) as determined by affinity chromatography and resonant waveguide optical biosensor technology. Both compounds inhibited protein disulfide isomerase activity and induced cell death of different HCC cells at sub or low micromolar ranges detected by classical biochemical end-point assay as well as with real-time label-free measurements. Besides cell proliferation inhibiton, analogs also inhibited cell migration even at 250 nM. Relative biodistribution of the analogs was analysed in native tissue sections of different organs after administration of drugs, and by using fluorescent confocal microscopy based on the inherent blue fluorescence of the compounds. The analogs mainly accumulated in the liver. The effects of Ac-915 and Ac-2010 were also demonstrated on the advanced stages of hepatocarcinogenesis in a transgenic mouse model of N-nitrosodiethylamine (DEN)-induced HCC. Significantly less tumor development was found in the livers of the Ac-915- or Ac-2010-treated groups compared with control mice, characterized by less liver tumor incidence, fewer tumors and smaller tumor size. Conclusion: These results imply that these amino-trifluoro-phthalimide analogs could serve potent clinical candidates against HCC alone or in combination with dietary polyunsaturated fatty acids. © 2013 Nagy et al.; licensee BioMed Central Ltd.

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