News Column

Reports from Institute of Pharmaceutical Science Describe Recent Advances in Nanoparticles

June 27, 2014

By a News Reporter-Staff News Editor at Science Letter -- Investigators discuss new findings in Nanoparticles. According to news reporting out of Zurich, Switzerland, by NewsRx editors, research stated, "Magnetic resonance navigation (MRN), achieved with an upgraded MRI scanner, aims to guide new therapeutic magnetic microcarriers (TMMC) from their release in the hepatic vascular network to liver tumor. In this technical note, in vitro and in vivo MRI properties of TMMC, loaded with iron-cobalt nanoparticles and doxorubicin, are reported by following three objectives: (1) to evaluate the lengthening of echo-time (TE) on nano/microparticle imaging; (2) to characterize by MRI TMMC distribution in the liver; and (3) to confirm the feasibility of monitoring particle distribution in real time."

Our news journalists obtained a quote from the research from the Institute of Pharmaceutical Science, "Phantom studies were conducted to analyze nano/microparticle signals on T (2)*-weighted gradient-echo (GRE) MR images according to sample weight and TE. Twelve animal experiments were used to determine in vivo MRI parameters. TMMC tracking was evaluated by magnetic resonance imaging (MRI) in four rabbits, which underwent MRN in the hepatic artery, three without steering, two in real-time, and three as blank controls. TMMC distribution in the right and left liver lobes, determined by ex vivo MR image analysis, was compared to the one obtained by cobalt level analysis. TMMC induced a hypointense signal that overran the physical size of the sample on MR images. This signal, due to the nanoparticles embedded into the microparticles, increased significantly with echo-time and sample amount (p < 0.05). In vivo, without steering, contrast-to-noise ratio (CNR) values for the right and left lobes were similar. With MRN, the CNR in the targeted lobe was different from that in the untargeted lobe (p = 0.003). Ex vivo, TMMC distribution, based on MRI signal loss volume measurement, was correlated with that quantified by Co level analysis (r = 0.92). TMMC accumulation was tracked in real time with an 8-s GRE sequence."

According to the news editors, the research concluded: "MRI signal loss induced by TMMC can serve to track particle accumulation and to assess MRN efficiency."

For more information on this research see: MR Imaging of Therapeutic Magnetic Microcarriers Guided by Magnetic Resonance Navigation for Targeted Liver Chemoembolization. Cardiovascular and Interventional Radiology, 2014;37(3):784-790. Cardiovascular and Interventional Radiology can be contacted at: Springer, 233 Spring St, New York, NY 10013, USA. (Springer -; Cardiovascular and Interventional Radiology -

Our news journalists report that additional information may be obtained by contacting P. Pouponneau, ETH, Inst Pharmaceut Sci, Dept. of Chem & Appl Biosci, Zurich, Switzerland. Additional authors for this research include G. Soulez, G. Beaudoin, J.C. Leroux and S. Martel (see also Nanoparticles).

Keywords for this news article include: Zurich, Europe, Switzerland, Nanotechnology, Emerging Technologies

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Source: Science Letter