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  • Title: Contrast enhancement of the brain by folate-conjugated gadolinium-diethylenetriaminepentaacetic acid-human serum albumin nanoparticles by magnetic resonance imaging.
    Author: Korkusuz H, Ulbrich K, Bihrer V, Welzel K, Chernikov V, Knobloch T, Petersen S, Huebner F, Ackermann H, Gelperina S, Korkusuz Y, Kromen W, Hammerstingl R, Haupenthal J, Fiehler J, Zeuzem S, Kreuter J, Vogl TJ, Piiper A.
    Journal: Mol Imaging; 2012; 11(4):272-9. PubMed ID: 22954143.
    Abstract:
    Different from regular small molecule contrast agents, nanoparticle-based contrast agents have a longer circulation time and can be modified with ligands to confer tissue-specific contrasting properties. We evaluated the tissue distribution of polymeric nanoparticles (NPs) prepared from human serum albumin (HSA), loaded with gadolinium-diethylenetriaminepentaacetic acid (Gd-DTPA) (Gd-HSA-NP), and coated with folic acid (FA) (Gd-HSA-NP-FA) in mice by magnetic resonance imaging (MRI). FA increases the affinity of the Gd-HSA-NP to FA receptor-expressing cells. Clinical 3 T MRI was used to evaluate the signal intensities in the different organs of mice injected with Gd-DTPA, Gd-HSA-NP, or Gd-HSA-NP-FA. Signal intensities were measured and standardized by calculating the signal to noise ratios. In general, the NP-based contrast agents provided stronger contrasting than Gd-DTPA. Gd-HSA-NP-FA provided a significant contrast enhancement (CE) in the brain (p  =  .0032), whereas Gd-DTPA or Gd-HSA-NP did not. All studied MRI contrast agents showed significant CE in the blood, kidney, and liver (p < .05). Gd-HSA-NP-FA elicited significantly higher CE in the blood than Gd-HSA-NP (p  =  .0069); Gd-HSA-NP and Gd-HSA-NP-FA did not show CE in skeletal muscle and gallbladder; Gd-HSA-NP, but not Gd-HSA-NP-FA, showed CE in the cardiac muscle. Gd-HSA-NP-FA has potential as an MRI contrast agent in the brain.
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