Facultatea de Chimie şi Tehnologie Chimică / Faculty of Chemistry and Chemical Technology
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Item COORDINATION COMPOUND, DERIVATIVE OF ISOTHIOSEMICARBAZIDE OF TRANSITION METALS AS AN INHIBITOR OF SUPEROXIDE RADICALS(2021) Pantea, Valeriana; Graur, Vasilii; Andronache, Lilia; Gulea, Aurelian; Tsapkov, Victor; Sardari, Veronica; Gamaniuc, Marina; Gudumac, ValentinA new biologically active coordination compound, which belongs to the class of transition metal isotiosemicarbazides - bis (m2-acetate-o) -bis {[N-prop-2-en-1-yl-N'- (pyridin- 2-ylmethylidene) carbamo-hydrazonothioate] copper} dihydrate was obtained. It has established that this compound exhibits strong anti-radical properties to the action of the organic molecule with the superoxide radical. Due to this property, the obtained compound can have a wide application in medicine as an inhibitor of superoxide radicals in the human body, thus preventing damage to cells and tissues, atherosclerosis and carcinogenesis. The synthesized coordination compound expands the arsenal of superoxide radical inhibitors with high biological activity.Item COPPER (II) ACETATE COORDINATION COMPOUND WITH 2-FORMYLPYRIDINE 4-ALLYLTHIOSEMICARBAZONE MANIFESTS INHIBITORY ACTIVITY AGAINST SUPEROXIDE RADICALS(Marina Sokolova Publishings, 2021) Pantea, Valeriana; Graur, Vasilii; Andronache, Lilia; Gulea, Aurelian; Tsapkov, Victor; Sardari, Veronica; Gamaniuc, Mariana; Gudumac, ValentinA new biologically active coordination compound, which belongs to the class of transition metal isotiosemicarbazides - bis (2-acetate-o) -bis {[N-prop-2-en-1-yl-N'- (pyridin- 2-ylmethylidene) carbamo-hydrazonothioate] copper} dihydrate was obtained. It has established that this compound exhibits strong anti-radical properties to the action of the organic molecule with the superoxide radical. Due to this property, the obtained compound can have a wide application in medicine as an inhibitor of superoxide radicals in the human body, thus preventing damage to cells and tissues, atherosclerosis and carcinogenesis. The synthesized coordination compound expands the arsenal of superoxide radical inhibitors with high biological activity.Item COPPER(II) COORDINATION COMPOUNDS WITH THIOSEMICARBAZIDE DERIVATIVES AS INHIBITORS OF SUPEROXIDE RADICALS(Marina Sokolova Publishings, 2022) Gulea, Aurelian; Tsapkov, Victor; Graur, Vasilii; Pantea, Valeriana; Andronache, Lilia; Shvets, I.; Matusovsky, V.; Lisii, D.; Botnaru, M.; Gudumac, ValentinNew biologically active coordination compounds of copper(II) based on substituted 3-(phenyl)-1-(pyridin-2-yl)prop-2-en- 1-one 4-allylthiosemicarbazones have been obtained. It was found that these compounds exhibit strong antiradical properties when interacting with a superoxide radical. Due to this property, the obtained compounds can find wide application in medicine as inhibitors of superoxide radicals in the human body, thus preventing damage of cells and tissues, multifactorial diseases, including carcinogenesis. The synthesized coordination compounds expand the arsenal of superoxide radical inhibitors with high biological activity. Their possible significance for the development of new treatment strategies for diseases associated with the overproduction of superoxide radicals discussed.Item EXPRESIA ENZIMELOR GLUTATIONICE ÎN ŢESUTUL SPLENIC ESTE INFLUENȚATĂ DE DERIVAȚII TIOSEMICARBAZIDEI(2021) Andronache, Lilia; Pantea, Valeriana; Gulea, Aurelian; Șveț, Ina; Ghindă, Sergiu; Privalova, Elena; Smeșnoi, Valentina; Gudumac, ValentinAdministrarea unor baze heterociclice Schiff noi și complexelor lor cu cuprul (II), derivați ai tiosemicarbazidei induce influenţe variate asupra activității enzimelor glutation-dependente în țesutul splenic. Este evidentă acţiunea selectivă a compușilor studiați asupra expresării enzimelor glutationice care se manifestă prin tendinţă de diminuare nesemnificativă a glutationreductazei (GR) și glutationperoxidazei (GPO), creșterea neimportantă a glutation-S-transferazei (GST) și depresia marcată a nivelului glutaredoxinei. Sporul leger al GST la acțiunea compușilor studiați poate fi considerată drept o reacție de protecție orientată să stagneze intensitatea proceselor peroxidice și să susțină activitatea ciclului glutationic, iar diminuarea enzimoactivității glutaredoxinei denotă efectul lor antiproliferativ, citostatic. Sunt necesare studii suplimentare pentru a evalua mecanismele de acțiune ale compușilor cercetați asupra activității enzimelor glutation-dependente în alte biosisteme și experimente pe animale pentru a aprecia importanța practică a rezultatelor obținute.Item IN VITRO ANTIPROLIFERATIVE ACTIVITY AND ANTIOXIDANT CAPACITY OF NEW ORGANOMETALLIC COORDINATION COMPOUNDS, RESULTS CORRELATION ANALYSIS(2016) Gulea, Aurelian; Gudumac, Valentin; Garbuz, Olga; Andronache, LiliaA fost examinată și testată capacitatea inhibitorilor organometalici activi CMJ-33, CMSA-4, de a induce apoptoza în celulele epiteliale de carcinom de col uterin linia HeLa. Viabilitatea celulelor canceroase a fost determinată prin testul Alamar Blue fiind folosit un indicator redox – resazurin. S-a depistat activitate antitumorală mai mare a substanțelor testate decât la cea luată în calitate de etalon: - doxorubicina (DOXO). În scopul de a detecta eventuala prezenţă a efectelor adverse concomitente legate cu proprietățile pro-oxidante ale compușilor coordinativi, a fost folosită metoda cantitativă ORAC (Oxygen Radical Absorption Capacity). Rezultatele au demonstrat că substanțele testate CMT-67 şi CMSA-4 posedă activitate antioxidantă mai mare decât Trolox și DOXO. În această lucrare, noi constatăm prezența unei corelații pozitive semnificative (coeficient de corelație - 0,98) între efectele anti-proliferative și anti-oxidante pentru compuşii CMT-67, CMSA-4 și DOXO.Item MICROMOLECULAR INHIBITORS OF SUPEROXIDE RADICALS(2021) Andronache, Lilia; Pantea, Valeriana; Gulea, Aurelian; Șveț, Inna; Graur, Vasilii; Matcovschi, Valerii; Gamaniuc, Marina; Gudumac, ValentinBackground: Currently, there is a growing interest in new copper (Cu2+) heterocyclic coordination compounds (CC), isothiosemicarbazide derivates, which demonstrated multiple beneficial properties, but their effect on reactions with free radicals such as the superoxide radical has not been investigated. Material and methods: The action of new micromolecular complexes of copper (Cu2+) chloride and bromide with methyl n- (prop-2-en-1-yl) -2- (pyridin2-ylmethylidene) hydrazine carbimidothioate on capturing activity of the superoxide radical was determined by the spectrophotometric method in vitro experiments. Results: It was established that the micromolecular complexes of copper (II) chloride and bromide with methyl n-(prop-2-en-1-yl)-2-(pyridin-2ylmethylidene) hydrazine carbimidothioate have been found to possess strong superoxide radical inhibitor properties when interacting with a superoxide radical. In addition to this, the IC50 of the studied compounds depends on the nature of the acid-ligand in the internal sphere of the complex and increases in the following sequence: Cl-–Br-. Conclusions: The established property of mentioned compounds is new, because their use as micromolecular inhibitors of superoxide radicals has not been described so far. The synthesized CC expand the arsenal of superoxide radical inhibitors with high biological activity. Their possible significance for the development of new treatment strategies for diseases associated with the overproduction of superoxide radicals is discussed.Item MODIFICĂRILE SISTEMULUI GLUTATIONIC ERITROCITAR ÎN NORMĂ ŞI ASTM BRONŞIC ASOCIAT SUB ACŢIUNEA UNOR COMPUŞI BIOLOGICI ACTIVI AUTOHTONI(2016) Pantea, Valeriana; Tagadiuc, Olga; Procopișin, Larisa; Andronache, Lilia; Gulea, Aurelian; Gudumac, ValentinS-a studiat infl uenţa compuşilor biologic activi (CBA) autohtoni - CMD-4, CMD-8, CMJ-33 şi CMJ-23 asupra indicilor sistemului glutationic eritrocitar (GSH, GR, GPO, GST, G-6-PDH) in vitro în condiţii normale şi în astmul bronşic (AB) de severitate diferită. S-a stabilit că CBA autohtoni exercită efecte modulatoare relevante asupra pricipalelor enzime ale metabolismului GSH, preponderent stimulatoare, fapt ce ar putea fi apreciat ca un răspuns pozitiv ce poate proteja celulele de efectele toxice ale stresului oxidativ specifi c pentru AB. Indicii studiați pot fi folosiți ca biomarcheri informativi pentru monitorizarea procesului patologic și aprecierea efi cienţei preparatelor noi la restabilirea biochimică şi funcţională a sistemelor de protecție celulare în AB și diverse leziuni pulmonare.Item NEW INHIBITORS OF GLYCATION AND OF THE FORMATION OF ADVANCED GLYCATION END PRODUCTS(Academia de Ştiinţe a Moldovei, 2015) Andronache, Lilia; Gudumac, Valentin; Gulea, Aurelian; Tagadiuc, Olga; Garbuz, Olga; Pantea, ValerianaItem THIOL-DISULFIDE METABOLISM IN KIDNEY TISSUE AT THE ADMINISTRATION OF SOME COPPER COORDINATION COMPOUNDS(2020) Sardari, Veronica; Pantea, Valeriana; Gulea, Aurelian; Tagadiuc, Olga; Andronache, Lilia; Șveț, Inna; Țapcov, Victor; Gudumac, ValentinThiol-disulfide metabolism is essential for normal function of the organism. Thus the interest of the scientists in this area of research continues to grow. Material and methods: Copper coordination compounds (CCC), derivatives of thiosemicarbaside (CMD-4, CMJ-33, CMT-67), action on thiol-disulfide metabolism in the healthy Ratta albicans kidneys were studied. The animals were divided in 6 groups of 7 rats each. The control group included healthy rats which were injected i/m physiological solution 3 times a week, for 30 days. The rats from groups 2-6 have got 3 times a week, for 30 days, i/m injections of CCC. The activity of following thiol-disulfide metabolism enzymes in the renal supernatant has been measured: glutathion-reductase (GR), glutathion-peroxidase (GPO), glutathion-S-transferase (G-S-T), γ-glutamyl transpeptidase (γ-GTP), glutaredoxin (Grx), as well the amount of the protein SH-groups and of the total glutathione, reduced glutathione (GSH) and oxidized glutathione (GSSG) in renal tissue. Results: The compounds exhibit different actions: CMT-67 in the dose of 0.1 μM/kg influenced the activity of the glutathione metabolism enzymes – activated γ-glutamyl transpeptidase (γ-GTP) and glutaredoxine (Grx) and inhibited glutathione reductase (GR), while CMD-4 in doses of 0.1 μM/kg and 1.0 μM/kg and CMJ-33 in the dose of 1.0 μM/kg significantly diminished the reduced glutathione (GSH) level and increased the amount of the oxidised one (GSSG). Conclusions: Selective action of the copper coordination copounds established by this study opens new possibilities of their usage in the therapy of kidney diseases.Item USE OF MICROMOLECULAR COPPER COMPLEXES OF THIOSEMICARBAZIDES AS AN ENDOGENOUS CATALASE INDUCER/ACTIVATOR(2024) Andronache, Lilia; Pantea, Valeriana; Gulea, Aurelian; Tagadiuc, Olga; Matcovschi, ValeriiOxidative stress is a major mechanism in the pathogenesis of many diseases, including severe multifactorial ones. Catalase (CAT), along with superoxide dismutase, is one of the first-line antioxidant defense enzymes. The development of methods/compounds that can increase/induce CAT will provide new possibilities to strengthen antioxidant protection and prevent oxidative damage to cells and tissues.