en Radiation Biology Radiation Biology تحقيق بديع Original Research <div style="text-align: justify;"><span style="font-size:10pt"><span style="text-justify:newspaper"><span style="text-kashida-space:50%"><span style="line-height:119%"><span style="font-family:Calibri"><span style="color:black"><span lang="en-US" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:#1f497d"><span style="font-style:italic"><span style="font-weight:bold"><span style="language:en-US">Background</span></span></span></span></span></span><span lang="en-US" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:#1f497d"><span style="font-weight:bold"><span style="language:en-US">:</span></span></span></span></span> <span lang="en-GB" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-GB">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 (MgCl</span></span></span></span><span lang="en-GB" style="font-size:5.9939pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-GB">₂</span></span></span></span><span lang="en-GB" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-GB">), and zinc oxide nanoparticles (ZnO NPs) on DNA single-strand breaks. </span></span></span></span><span lang="en-GB" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:#1f497d"><span style="font-style:italic"><span style="font-weight:bold"><span style="language:en-GB">Materials and Methods: </span></span></span></span></span></span><span lang="en-US" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-US">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), MgCl</span></span></span></span><span lang="en-GB" style="font-size:5.9939pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-GB">₂</span></span></span></span><span lang="en-US" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-US"> (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). </span></span></span></span><span lang="en-US" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:#1f497d"><span style="font-style:italic"><span style="font-weight:bold"><span style="language:en-US">Results: </span></span></span></span></span></span><span lang="en-US" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-US">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 MgCl</span></span></span></span><span lang="en-GB" style="font-size:5.9939pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-GB">₂</span></span></span></span><span lang="en-US" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-US"> treatment did not elicit a statistically significant effect on the DNA single-strand compared to the control group (p=0.277). </span></span></span></span><span lang="en-US" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:#1f497d"><span style="font-style:italic"><span style="font-weight:bold"><span style="language:en-US">Conclusion: </span></span></span></span></span></span><span lang="en-US" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-US">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 MgCl</span></span></span></span><span lang="en-GB" style="font-size:5.9939pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-GB">₂</span></span></span></span><span lang="en-US" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-US"> was safer with no effect on DNA single-strand. This suggests that MgCl</span></span></span></span><span lang="en-GB" style="font-size:5.9939pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-GB">₂</span></span></span></span><span lang="en-US" style="font-size:9.0pt"><span style="font-family:Calibri"><span style="color:black"><span style="language:en-US"> is more suitable as an alternative contrast media in MRI scanning.</span></span></span></span></span></span></span></span></span></span></div> Magnetic resonance imaging, gadolinium, magnesium chloride, zinc oxide nanoparticles, DNA single-strand, alkaline comet assay. 131 137 http://ijrr.com/browse.php?a_code=A-10-1-1148&slc_lang=en&sid=1 R.M. Shaheen rmoozshahin@yahoo.com 7900319475328460028953 7900319475328460028953 Yes School of Physics, Universiti Sains Malaysia, 11800, Gelugor, Pulau Pinang, Malaysia N.N.A. Bt Nik Ab Razak nnashikin@usm.my 7900319475328460028954 7900319475328460028954 No School of Physics, Universiti Sains Malaysia, 11800, Gelugor, Pulau Pinang, Malaysia M.M. Radhi 7900319475328460028955 7900319475328460028955 No Health and Medical Technology College, Middle Technical University, Baghdad, Iraq N. Binti Suardi 7900319475328460028956 7900319475328460028956 No School of Physics, Universiti Sains Malaysia, 11800, Gelugor, Pulau Pinang, Malaysia M. Mohammed 7900319475328460028957 7900319475328460028957 No Department of Clinical Pharmacy and Pharmacy Practice, Ahmadu Bello University, Zaria, Kaduna, Nigeria