In this study, a novel targeted MRI contrast agent was developed by coating gadolinium oxide nanoparticles (Gd2O3 NPs) with β-cyclodextrin (CD)-based polyester and targeted by folic acid (FA).
Materials and methods
The developed Gd2O3@PCD–FA MRI contrast agent was characterized and evaluated in relaxivity, in vitro cell targeting, cell toxicity, blood compatibility and in vivo tumor MR contrast enhancement.
In vitro cytotoxicity and hemolysis assays revealed that Gd2O3@PCD–FA NPs have no significant cytotoxicity after 24 and 48 h against normal human breast cell line (MCF-10A) at concentration of up to 50 µg Gd+3/mL and have high blood compatibility at concentration of up to 500 µg Gd+3/mL. In vitro MR imaging experiments showed that Gd2O3@PCD–FA NPs enable targeted contrast T1- and T2-weighted MR imaging of M109 as overexpressing folate receptor cells. Besides, the in vivo analysis indicated that the maximum contrast-to-noise ratio (CNR) of tumor in mice increased after injection of Gd2O3@PCD–FA up to 5.89 ± 1.3 within 1 h under T1-weighted imaging mode and reduced to 1.45 ± 0.44 after 12 h. While CNR increased up to maximum value of 1.98 ± 0.28 after injection of Gd2O3@PCD within 6 h and reduced to 1.12 ± 0.13 within 12 h.
The results indicate the potential of Gd2O3@PCD–FA to serve as a novel targeted nano-contrast agent in MRI.
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This work was supported in part by the research chancellor of Tehran University of Medical Sciences (Grant no. 96-04-30-36739), Tehran, Iran.
Conflict of interest
The authors do not have any conflict of interest.
All in vivo protocols were performed based on the European Community guidelines and was approved by local ethical committee, Tehran University of Medical Sciences (TUMS), Tehran, Iran (Approval number: IR.TUMS.REC0.1394.1461).
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Mortezazadeh, T., Gholibegloo, E., Alam, N.R. et al. Gadolinium (III) oxide nanoparticles coated with folic acid-functionalized poly(β-cyclodextrin-co-pentetic acid) as a biocompatible targeted nano-contrast agent for cancer diagnostic: in vitro and in vivo studies. Magn Reson Mater Phy 32, 487–500 (2019). https://doi.org/10.1007/s10334-019-00738-2
- Targeted nano-contrast agent
- Magnetic resonance imaging
- Longitudinal relaxivity
- Contrast enhancement