Browsing by Author "Bilgin, BES"

Now showing 1 - 4 of 4
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    One-step conjugation of glycylglycine with [18F]FDG and a pilot PET imaging study
    Senisik, AM; Içhedef, Ç; Kilçar, AY; Uçar, E; Ari, K; Göksoy, D; Parlak, Y; Bilgin, BES; Teksöz, S
    This study describes a single step conjugation of Glycylglycine (GlyGly) which is a small peptide, with [F-18]FDG via oxime formation. Amiooxy-functionalization of GlyGly (AO-GlyGly) was accomplished through the reaction of Boc-aminooxy succinimide ester. Conjugation reaction was performed at 100 A degrees C for 30 min in a vial containing AO-GlyGly and [F-18]FDG solution. The radiolabeled product ([F-18]FDG-GlyGly) was obtained with 98.65 +/- 0.35% yield without any purification step which makes this method more attractive for F-18 radiolabeling. The present study is concluded with an in vivo pilot animal PET study to assess biodistribution and kinetics of chemoselectively [F-18]FDG tagged GlyGly in vivo.
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    99mTc(I) carbonyl-radiolabeled lipid based drug carriers for temozolomide delivery and bioevaluation by in vitro and in vivo
    Ari, K; Uçar, E; Içhedef, Ç; Kilçar, AY; Medine, EI; Parlak, Y; Bilgin, BES; Aydin, B; Gümüser, FG; Teksöz, S
    In preclinical research radiolabeled nanoparticles have been attracting interest as a new class of imaging probes. Assuming good stability of solid lipid nanoparticles (SLNs) under physiological conditions, radiolabeled SLNs can be used for imaging and measuring uptake in target tissue. Present study was performed to evaluate biological behavior of temozolomide (TMZ) loaded solid lipid nanoparticles (SLN-TMZ) in vivo and in vitro. Lipid nanoparticles were prepared by emulsification and low-temperature solidification method. zeta potential, morphology and particle size of nanoparticles were determined. Biological behavior of( 99m)Tc(CO)(3)(+) radiolabeled SLN-TMZ were investigated in vitro on U87/Daoy cell lines and in vivo on female Wistar Albino rats. Obtained results of in vitro incorporation, in vivo biodistribution and gamma imaging studies on radiolabeled SLN-TMZ show that the radiolabeled solid lipid nanoparticles could have potential as a drug delivery system for TMZ.
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    Synthesis, characterization and radiolabeling of folic acid modified nanostructured lipid carriers as a contrast agent and drug delivery system
    Ucar, E; Teksoz, S; Ichedef, C; Kilcar, AY; Medine, EI; Ari, K; Parlak, Y; Bilgin, BES; Unak, P
    Nanostructured lipid carriers (NLCs) are the new generation of solid lipid drug delivery systems. Their suitability as contrast agents for gamma scintigraphy is an attracting major attention. The aim of current study was to prepare surface modified nanostructured lipid carrier system for paclitaxel (PTX) with active targeting and imaging functions. In accordance with the purpose of study, PTX loaded nanostructured lipid carriers (NLCs) prepared, modified with a folate derivative and radiolabeled with technetium-99 m tricarbonyl complex (Tc-99 m(CO)(3)(+)). Cellular incorporation ratios of radiolabeled nanoparticles (Tc-99 m(CO)(3)-PTX-NLC) were investigated in vitro on three cancer cell lines. Additionally in vivo animal studies conducted to evaluate biological behavior of Tc-99 m(CO)(3)-PTX-NLC on female Wistar Albino rats. Biodistribution results showed that the folate derivative modified Tc-99 m(CO)(3)-PTX-NLC had considerably higher uptake in folate receptor positive organs. The data obtained from present study could be useful in the design of biodegradable drug carriers of PTX and folate receptor based tumor imaging agents.
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    Synthesis, radiolabeling and in vitro evaluation of azathioprine loaded magnetic solid lipid nanoparticles
    Türkkani, G; Güngör, B; Cetin, O; Içhedef, Ç; Parlak, Y; Gümüser, FG; Bilgin, BES; Teksöz, S
    In this study, it is aimed to design a smart drug delivery system for the diagnosis and treatment of cancer cells. Magnetic-solid lipid nanoparticles were synthesized as a drug delivery system and azathioprine (AZA) was loaded into this system. This newly created system was radiolabeled using technetium-99 m with a radiolabeling yield of 90.3%. Drug loading into the SLMNP was found as 86%. The biological behavior of Tc-99m and radiolabeled magnetic solid lipid nanoparticles loaded with azathioprine (Tc-99m-AZA-SLMNP) was investigated in vitro and in vivo.