Abstract
Metal-organic frameworks (MOFs) have shown a great potential as a novel contrast agent in magnetic resonance imaging (MRI) due to their unique properties including versatile structures, composition, and surface chemistry. Fe-MIL-88B-NH2 (MILs) was synthesized using Fe+3 ions and 2-aminoterephthalic acids (NH2-BDC) in the presence of acetic acid and Pluronic F127 under a hydrothermal process. Three MILs in different sizes were synthesized by using variant CH3COOH/Fe+3 molar ratios and denoted as MIL-S, MIL-M, and MIL-L having average sizes of 60, 350, and 730 nm, respectively. The effect of aspect ratio and particle size of MILs was investigated on proton relaxivity and contrast enhancement in aqueous, in vitro, and in vivo MR images. MRI study indicated that by increasing the MILs size, the incremental transverse relaxivity was achieved from 13.53 to 50.80 for r2 and from 38.75 to 60.25 for r2*, while the difference between r2 and r2* was decreased obviously. The r2/r1 ratios were found to be 5.80, 42.27, and 127.00 for MIL-S, MIL-M, and MIL-L, respectively. All MILs demonstrated T2-weighted MR imaging performance. Furthermore, no susceptibility artifacts were observed on T2-weighted images of MILs. By decreasing the size of MILs, r2/r1 ratio was reduced sharply and T1 contrast was also observed for MIL-S. MIL-S was used for in vitro and in vivo study due to its capability in simultaneous T1 and T2 contrast enhancements. MTT and hemolysis assays showed no significant cytotoxicity and hemolysis for MIL-S against normal human breast cell line (MCF-10A) and red blood cells, respectively, at concentrations of Fe+3 up to 300 μg/mL (p < 0.05). T1-weighted images acquired from in vitro study interestingly showed that the signal intensity of MIL-S is more than Dotarem. The in vivo experiment revealed that the signal intensity of mice liver decreased sharply after injection resulting in increase of negative contrast enhancement. The negative contrast enhancement decreased gradually by the time under T2-weighted imaging mode confirming application of MIL-S as a T2 contrast agent in biomedical applications (up to 12 h post-injection). Although a decrease of the size resulted in bright contrast in aqueous solution for MIL-S, it did not show proper efficiency for in vivo positive contrast enhancement. The advantages, including simple preparation and accessibility, acceptable potency and selectivity, blood compatibility, and suitable cytocompatibility as well as enough circulation time, make MIL-S as a dual MRI contrast agent to differentiate between low-contrast tissues for in vivo experiments.
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This study was supported by Tehran University of Medical Sciences for facilitation and financial support by grant number 94-04-30-30992.
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The in vivo study was performed in accordance with the European Community guidelines and approved by local ethical committee, Tehran University of Medical Sciences (TUMS), Tehran, Iran (Approval number: IR.TUMS.REC.1395.132).
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Dehghani, S., Alam, N.R., Shahriarian, S. et al. The effect of size and aspect ratio of Fe-MIL-88B-NH2 metal-organic frameworks on their relaxivity and contrast enhancement properties in MRI: in vitro and in vivo studies. J Nanopart Res 20, 278 (2018). https://doi.org/10.1007/s11051-018-4376-2
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DOI: https://doi.org/10.1007/s11051-018-4376-2