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Egils Bisenieks  - - - 
Top co-authors See all
Neven Zarkovic

110 shared publications

Laboratory for Oxidative Stress, Rudjer Boskovic Institute, 10000 Zagreb, Croatia

Gunars Duburs

52 shared publications

Latvian Institute of Organic Synthesis, Aizkraukles str. 21, Riga, LV-1006, Latvia

Aiva Plotniece

31 shared publications

Latvian Institute of Organic Synthesis, Aizkraukles Str. 21, Riga LV-1006, Latvia

Lidija Milkovic

22 shared publications

Laboratory for Oxidative Stress (LabOS), Ruđer Bošković Institute, Division of Molecular Medicine, 10 000 Zagreb, Croatia;(L.M.);(A.Č.G.)

Anatoly Mishnev

21 shared publications

Latvian Institute of Organic Synthesis, Aizkraukles str. 21, Riga, LV-1006, Latvia

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Publication Record
Distribution of Articles published per year 
(1997 - 2018)
Total number of journals
published in
 
12
 
Publications See all
Article 0 Reads 0 Citations Crystal structure and metabolic activity of 4-(thien-2-yl)-2-methyl-5-oxo-1,4,5,6,7,8-hexa­hydro­quinoline-3-carb­oxy­li... Anatoly Mishnev, Egils Bisenieks, Ilona Mandrika, Ramona Pet... Published: 12 October 2018
Acta Crystallographica Section E Crystallographic Communications, doi: 10.1107/S2056989018014251
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In this condensed 1,4-di­hydro­pyridine derivative, which exhibits metabolism-regulating activity, the 1,4-di­hydro­pyridine ring adopts a flattened boat conformation while the cyclo­hexenone ring is in an envelope conformation. Mol­ecules in the crystal are assembled into chains along the a-axis direction via N—H⋯O hydrogen bonds.
Article 2 Reads 2 Citations Antioxidative 1,4-Dihydropyridine Derivatives Modulate Oxidative Stress and Growth of Human Osteoblast-Like Cells In Vit... Lidija Milkovic, Tea Vukovic, Neven Zarkovic, Franz Tatzber,... Published: 19 September 2018
Antioxidants, doi: 10.3390/antiox7090123
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Oxidative stress has been implicated in pathophysiology of different human stress- and age-associated disorders, including osteoporosis for which antioxidants could be considered as therapeutic remedies as was suggested recently. The 1,4-dihydropyridine (DHP) derivatives are known for their pleiotropic activity, with some also acting as antioxidants. To find compounds with potential antioxidative activity, a group of 27 structurally diverse DHPs, as well as one pyridine compound, were studied. A group of 11 DHPs with 10-fold higher antioxidative potential than of uric acid, were further tested in cell model of human osteoblast-like cells. Short-term combined effects of DHPs and 50 µM H2O2 (1-h each), revealed better antioxidative potential of DHPs if administered before a stressor. Indirect 24-h effect of DHPs was evaluated in cells further exposed to mild oxidative stress conditions induced either by H2O2 or tert-butyl hydroperoxide (both 50 µM). Cell growth (viability and proliferation), generation of ROS and intracellular glutathione concentration were evaluated. The promotion of cell growth was highly dependent on the concentrations of DHPs used, type of stressor applied and treatment set-up. Thiocarbatone III-1, E2-134-1 III-4, Carbatone II-1, AV-153 IV-1, and Diethone I could be considered as therapeutic agents for osteoporosis although further research is needed to elucidate their bioactivity mechanisms, in particular in respect to signaling pathways involving 4-hydroxynoneal and related second messengers of free radicals.
Article 0 Reads 0 Citations Searching for inhibitors of human H 2 S-synthesizing enzymes by orthogonal methods Karim Zuhra, Pedro M.F. Sousa, Giulia Paulini, Ana Rita Lemo... Published: 01 May 2018
Free Radical Biology and Medicine, doi: 10.1016/j.freeradbiomed.2018.04.509
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Article 0 Reads 2 Citations Modifications of expression of genes and proteins involved in DNA repair and nitric oxide metabolism by carbatonides [di... Kristīne Ošiņa, Elina Leonova, Sergejs Isajevs, Larisa Bauma... Published: 26 September 2017
Archives of Industrial Hygiene and Toxicology, doi: 10.1515/aiht-2017-68-2945
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Studies on the pathogenesis of diabetes mellitus complications indicate that the compounds reducing free radicals and enhancing DNA repair could be prospective as possible remedies. Carbatonides, the disodium-2,6-dimethyl-1,4- dihydropyridine-3,5-bis(carbonyloxyacetate) derivatives, were tested for these properties. EPR spectroscopy showed that metcarbatone was an effective scavenger of hydroxyl radicals produced in the Fenton reaction, etcarbatone, and propcarbatone were less effective, styrylcarbatone was ineffective. UV/VIS spectroscopy revealed that styrylcarbatone manifested a hyperchromic effect when interacting with DNA, while all other carbatonides showeda hypochromic effect. Rats with streptozotocin induced type 1 DM were treated with metcarbatone, etcarbatone or styrylcarbatone (all compounds at doses 0.05 mg kg-1 or 0.5 mg kg-1) nine days after the DM approval. Gene expression levels in kidneys and blood were evaluated by quantitative RT-PCR; protein expression - immunohistochemically in kidneys, heart, sciatic nerve, and eyes; DNA breakage - by comet assay in nucleated blood cells. Induction of DM induced DNA breaks; metcarbatone and styrylcarbatone (low dose) alleviated this effect. Metcarbatone and etcarbatone up-regulated mRNA and protein of eNOS in kidneys of diabetic animals; etcarbatone also in myocardium. Etcarbatone reduced the expression of increased iNOS protein in myocardium, nerve, and kidneys. iNos gene expression was up-regulated in kidneys by etcarbatone and metcarbatone in diabetic animals. In blood, development of DM increased iNos gene expression; etcarbatone and metcarbatone normalised it. Etcarbatone up-regulated the expression of H2AX in kidneys of diabetic animals but decreased the production of c-PARP1. Taken together, our data indicate that carbatonides might have a potential as drugs intended to treat DM complications.
Article 0 Reads 2 Citations 1,4-Dihydropyridine derivatives without Ca2+-antagonist activity up-regulate Psma6 mRNA expression in kidneys of intact ... Kristīne Ošiņa, Evita Rostoka, Jeļizaveta Sokolovska, Natali... Published: 04 December 2015
Cell Biochemistry and Function, doi: 10.1002/cbf.3160
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Article 2 Reads 3 Citations Direct Aminolysis of Ethoxycarbonylmethyl 1,4-Dihydropyridine-3-carboxylates Brigita Vigante, Martins Rucins, Aiva Plotniece, Karlis Paju... Published: 12 November 2015
Molecules, doi: 10.3390/molecules201119697
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The ethoxycarbonylmethyl esters of 1,4-dihydropyridines were directly converted into carbamoylmethyl esters in the presence of 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) in good to excellent yields under mild conditions. The use of TBD is crucial for the successful aminolysis of ethoxycarbonylmethyl ester of 1,4-dihydropyridines with secondary amines as without it the reaction does not proceed at all. The aminolysis reaction proceeded regioselectively, as the alkyl ester conjugated with the 1,4-dihydropyridine cycle was not involved in the reaction. Screening of other N-containing bases, such as triethylamine (TEA), pyridine, 4-(N,N-dimethylamino)pyridine (DMAP), 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), 1,5-diazabicyclo[4.3.0]non-5-ene (DBN), imidazole, tetramethyl guanidine (TMG) and 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (MTBD) as catalysts revealed no activity in the studied reaction.
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