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Showing 3 results for Gadolinium

Dr. J.k. Kim, T.w. Park, A. Cebulska-Wasilewska, M. Nili,
Volume 7, Issue 2 (9-2009)
Abstract

Background: Boron and gadolinium are among the nuclides that hold a unique property of being a neutron capture therapy agent. Neutron beams have often a considerable portion of gamma rays with fast neutrons. Gamma rays, as beam contaminants, can cause considerable damage to normal tissues even if such tissues do contain high boron concentrations. Materials and Methods: The modification of radioresponse in human lymphocytes pretreated with boron or gadolinium compound was studied by assessing the DNA damage using single cell gel electrophoresis (SCGE), the comet assay. The lymphocytes from the human peripheral blood were irradiated with 0, 1, 2 and 4 Gy of gamma rays from a 60Co isotopic source with or without pretreatment of boron or gadolinium compound for 10 minutes at 4oC. Post-irradiation procedures included slide preparation, cell-lysing, unwinding and electrophoresis, neutralization, staining, and analytic steps, gel electrophoresis. Results: The results indicate that pretreatment with boron compound (50 nM or 250 nM of 10B) is effective in reducing the radiosensitivity of the lymphocyte DNA. Conversely, pretreatment with gadolinium compound (50 nM) led to a dose-dependent increase in the radiosensitivity, most prominently with a dose of 4 Gy (P<0.001). Furthermore, when the lymphocytes were pretreated with a combined mixture (1:1) of boron (250 nM) and gadolinium (50 nM) compounds, the reduced radiosensitivity was also observed. Iran. J. Radiat. Res., 2009 7 (2): 63-68
N. Banaee, Dr. H.a. Nedaie, A.r. Shirazi, A.r. Zirak, S. Sadjadi,
Volume 14, Issue 2 (4-2016)
Abstract

Background: New treatment modalities are developed with the aim of escalating tumor absorbed dose and simultaneously sparing the normal structures. The use of nanotechnology in cancer treatment offers some possibilities including destroying cancer tumors with minimal damage to healthy tissues. Zinc Oxide nanoparticles (ZnO NPs) are wide band gap semiconductors and seem to have a good effect on increasing the absorbed dose of target volume especially when doped with a high Z element. The aim of this study was to evaluate the effect of ZnO NPs doped with Gadolinium (Gd) on dose enhancement factor by 6MV photon beam irradiation. Materials and Methods: Various concentrations of ZnO NPs doped with 5% Gd were incorporated into PRESAGE composition, the 3D chemical dosimeter. Then by using a UV-Vis spectrophotometer optical density changes and also dose enhancement factor (DEF) were determined. Results: The results of this study showed that by incorporating 500, 1000, 3000 and 4000 µg/ml ZnO NPs doped with Gd into PRESAGE structure the dose enhancement factor of about 1.57, 1.69, 1.78 and 1.82 in a 15 ×15 cm2 field size could be found, respectively. Conclusion: The results of this study showed that ZnO NPs doped with Gd could be considered as new compound for increasing the absorbed dose.


Ph.d., R.m. Shaheen, Ph.d., N.n.a. Bt Nik Ab Razak, M.m. Radhi, N. Binti Suardi, M. Mohammed,
Volume 22, Issue 1 (1-2024)
Abstract

Background: Gadolinium (Gd) is a widely used MRI contrast agent that improves visibility and aids in accurate diagnosis. However, conflicting reports exist regarding its genotoxic effects. This study investigates the bio-effects of Gd and alternative contrast media, magnesium chloride (MgCl2), and zinc oxide nanoparticles (ZnO NPs) on DNA single-strand breaks. Materials and Methods: In this in-vitro comparative experiment, 12 adult New Zealand rabbits (males aged between 4.5 to 5.5 months, weighing 2.5 to 3.0 kg) were utilized. The rabbits received intravenous injections of different contrast agents, namely Gd (n=3), MgCl2 (n=3), ZnO NPs (n=3), and a control group (n=3). Following this, all the rabbits were subjected to MRI at 1.5 Tesla (T) with an RF of 64 MHz for 20 minutes. The alkaline comet assay assessed the presence of single-strand breaks (SSB). Results: The results of the study revealed a statistically significant increase in DNA SSB in both the Gd (p<0.010) and ZnO NPs (p=0.006) treated groups compared to the normal control group. However, the alternative MgCl2 treatment did not elicit a statistically significant effect on the DNA single-strand compared to the control group (p=0.277). Conclusion: The contrast medium Gd and alternative ZnO NPs were demonstrated to cause significant DNA single-strand breaks, with the Gd causing more damage than ZnO NPs. However, the alternative contrast MgCl2 was safer with no effect on DNA single-strand. This suggests that MgCl2 is more suitable as an alternative contrast media in MRI scanning.


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