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Sremska Mitrovica, Serbia

Djordjevic A.,University of Novi Sad | Ajdinovic B.,Military Medical Academy | Dopudja M.,Military Medical Academy | Trajkovic S.,Military Medical Academy | And 6 more authors.
Digest Journal of Nanomaterials and Biostructures | Year: 2011

In this study we performed the dynamic and static scintigraphy of the domestic dog, using the newly synthesized radiopharmaceutical, [99mTc(CO)3(H2O)3]-C60(OH)22-24. In the current study, an advanced one-step method for the functionalization of fullerenol by 99mTc is described. Optical properties of as-prepared samples and the mechanism responsible for the functionalization were investigated using UV-VIS and FTIR spectroscopy, respectively. Also, the presence of the Tc complex on fullerenol was confirmed by using the energy dispersive X-ray spectroscopy, HPLC and MALDI TOF techniques.This simple and effective method of producing a new radiopharmaceutical is of interest not only for its application in various areas of technology and biology, but also for investigating its potential use in radiation technology for nanoengineering of materials. With dynamic scintigraphy, performed during 30 minutes (120 frames, 15 sec per frame), we obtained ratios of heart, liver and spleen counts: 222/249/168; 178/320/217; 120/348/239 respectively. By static scintigraphy after 1 hour, we detected the activity in heart, liver, spleen and intestines. After 4 hours, the radiopharmaceutical activity was detected in salivary glands. The detection after 21 hours showed the activity in kidneys and urinary bladder, while the activity in intestines was absent. After 24 hours, we detected the activity in liver, spleen, kidneys and urinary bladder. Pharmacokinetic investigations performed in this study are of key interest for the further fullerenol in vivo research. Source

Joksovic M.D.,University of Kragujevac | Bogdanovic G.,Institute of Oncology Sremska Kamenica | Kojic V.,Institute of Oncology Sremska Kamenica | Szecsenyi K.M.,University of Novi Sad | And 5 more authors.
Journal of Heterocyclic Chemistry | Year: 2010

(Chemical Equation Presented) New N-[(1,3-diphenylpyrazol-4-yl)methyl]a- amino acids (1a-i) have been synthesized and tested in vitro for their antiproliferative activity against human myelogenous leukemia K562, colon adenocarcinoma HT-29, cervix carcinoma HeLa, and normal fetal lung fibroblasts, MRC-5. Compounds derived from both phenylalanine enantiomer precursors appeared to be the most active against myelogenous leukemia K562 cell lines with a high cytotoxic potential. © 2010 HeteroCorporation. Source

Hollo B.,University of Novi Sad | Leovac V.M.,University of Novi Sad | Bombicz P.,Hungarian Academy of Sciences | Kovacs A.,Hungarian Academy of Sciences | And 7 more authors.
Australian Journal of Chemistry | Year: 2010

Template synthesis of N,N′-bis(4-acetyl-5-methylpyrazole-3-yl) formamidine (ampf) was performed starting from 4-acetyl-3-amino-5-methylpyrazole (aamp) and CH(OC2H5)3 in methanol in the presence of CuCl2, Cu(NO3)2, or Ni(NO 3)2. The ligand was isolated in coordinated form as [Cu(ampf)Cl2], [Cu(ampf)(MeOH)(NO3)2]MeOH, and [Ni(ampf)(MeOH)2(NO3)]NO3 correspondingly. The compounds were characterized by elemental analysis, Fourier-transform IR and electronic spectroscopy, thermal analysis, single-crystal X-ray diffraction, and quantum chemical (density functional theory) calculations. The density functional theory calculations provided information on the metalligand interactions in the complexes and assisted the assignment of the FT-IR spectra. The antiproliferative activity of the complexes and the ligand precursor, aamp, was tested against human myelogenous leukaemia K562, colon adenocarcinoma HT29, and cervix carcinoma HeLa. © 2010 CSIRO. Source

Pesic M.,University of Belgrade | Podolski-Renic A.,University of Belgrade | Stojkovic S.,University of Belgrade | Matovic B.,Vinca Institute of Nuclear Sciences | And 9 more authors.
Chemico-Biological Interactions | Year: 2015

Abstract Data on medical applications of cerium oxide nanoparticles CeO2 (CONP) are promising, yet information regarding their action in cells is incomplete and there are conflicting reports about in vitro toxicity. Herein, we have studied cytotoxic effect of CONP in several cancer and normal cell lines and their potential to change intracellular redox status. The IC50 was achieved only in two of eight tested cell lines, melanoma 518A2 and colorectal adenocarcinoma HT-29. Self-propagating room temperature method was applied to produce CONP with an average crystalline size of 4 nm. The results confirmed presence of Ce3+ and O2- vacancies. The induction of cell death by CONP and the production of reactive oxygen species (ROS) were analyzed by flow-cytometry. Free radicals related antioxidant capacity of the cells was studied by the reduction of stable free radical TEMPONE using electron spin resonance spectroscopy. CONP showed low or moderate cytotoxicity in cancer cell lines: adenocarcinoma DLD1 and multi-drug resistant DLD1-TxR, non-small cell lung carcinoma NCI-H460 and multi-drug resistant NCI-H460/R, while normal cell lines (keratinocytes HaCaT, lung fetal fibroblasts MRC-5) were insensitive. The most sensitive were 518A2 melanoma and HT-29 colorectal adenocarcinoma cell lines, with the IC50 values being between 100 and 200 μM. Decreased rate of TEMPONE reduction and increased production of certain ROS species (peroxynitrite and hydrogen peroxide anion) indicates that free radical metabolism, thus redox status was changed, and antioxidant capacity damaged in the CONP treated 518A2 and HT-29 cells. In conclusion, changes in intracellular redox status induced by CONP are partly attributed to the prooxidant activity of the nanoparticles. Further, ROS induced cell damages might eventually lead to the cell death. However, low inhibitory potential of CONP in the other human cell lines tested indicates that CONP may be safe for human usage in industry and medicine. © 2015 Elsevier Ireland Ltd. All rights reserved. Source

Veljovic D.,University of Belgrade | Colic M.,Military Medical Academy | Kojic V.,Institute of Oncology Sremska Kamenica | Bogdanovic G.,Institute of Oncology Sremska Kamenica | And 5 more authors.
Journal of Biomedical Materials Research - Part A | Year: 2012

The effect of decreasing the grain size on the biocompatibility, cell-material interface, and mechanical properties of microwave-sintered monophase hydroxyapatite bioceramics was investigated in this study. A nanosized stoichiometric hydroxyapatite powder was isostatically pressed at high pressure and sintered in a microwave furnace in order to obtain fine grained dense bioceramics. The samples sintered at 1200°C, with a density near the theoretical one, were composed of micron-sized grains, while the grain size decreased to 130 nm on decreasing the sintering temperature to 900°C. This decrease in the grain size certainly led to increases in the fracture toughness by much as 54%. An in vitro investigation of biocompatibility with L929 and human MRC-5 fibroblast cells showed noncytotoxic effects for both types of bioceramics, while the relative cell proliferation rate, cell attachment and metabolic activity of the fibroblasts were improved with decreasing of grain size. An initial in vivo investigation of biocompatibility by the primary cutaneous irritation test showed that both materials exhibited no irritation properties. © 2012 Wiley Periodicals, Inc. Source

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