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New Nanoparticles Findings from Health Research Institute Discussed (Photouncaging nanoparticles for MRI and fluorescence imaging in vitro and in...

September 12, 2014

New Nanoparticles Findings from Health Research Institute Discussed (Photouncaging nanoparticles for MRI and fluorescence imaging in vitro and in vivo)

By a News Reporter-Staff News Editor at Health & Medicine Week -- Research findings on Nanoparticles are discussed in a new report. According to news originating from Takamatsu, Japan, by NewsRx correspondents, research stated, "Multimodal and multifunctional nanomaterials are promising candidates for bioimaging and therapeutic applications in the nanomedicine settings. Here we report the preparation of photouncaging nanoparticles with fluorescence and magnetic modalities and evaluation of their potentials for in vitro and in vivo bioimaging."

Our news journalists obtained a quote from the research from Health Research Institute, "Photoactivation of such bimodal nanoparticles prepared using photouncaging ligands, CdSe/ZnS quantum dots, and super paramagnetic iron oxide nanoparticles results in the systematic uncaging of the particles, which is correlated with continuous changes in the absorption, mass and NMR spectra of the ligands. Fluorescence and magnetic components of the bimodal nanoparticles are characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and elemental analyses using energy dispersive X-ray (EDX) spectroscopy and X-ray photoelectron spectroscopy (XPS). Bioconjugation of the nanoparticles with peptide hormones renders them with biocompatibility and efficient intracellular transport as seen in the fluorescence and MRI images of mouse melanoma cells (B16) or human lung epithelial adenocarcinoma cells (H1650). Biocompatibility of the nanoparticles is evaluated using MTT cytotoxicity assays, which show cell viability over 90%. Further, we combine MRI and NIR fluorescence imaging in C57BL/6 (B6) mice subcutaneously or intravenously injected with the photouncaging nanoparticles and follow the in vivo fate of the nanoparticles. Interestingly, the intravenously injected nanoparticles initially accumulate in the liver within 30 min post injection and subsequently clear by the renal excretion within 48 h as seen in the time-dependent MRI and fluorescence images of the liver, urinary bladder, and urine samples."

According to the news editors, the research concluded: "Photouncaging ligands such as the ones reported in this article are promising candidates for not only the site-specific delivery of nanomaterials-based contrast agents and drugs but also the systematic uncaging and renal clearance of nanomaterials after the desired in vivo application."

For more information on this research see: Photouncaging nanoparticles for MRI and fluorescence imaging in vitro and in vivo. Acs Nano, 2013;7(11):9851-9. (American Chemical Society -; Acs Nano -

The news correspondents report that additional information may be obtained from E.S. Shibu, Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) , Takamatsu, Kagawa 761-0395, Japan. Additional authors for this research include K. Ono, S. Sugino, A. Nishioka, A. Yasuda, Y. Shigeri, S. Wakida, M. Sawada and V. Biju (see also Nanoparticles).

Keywords for this news article include: Takamatsu, Japan, Asia, Emerging Technologies, Nanoparticle, Nanoparticles, Nanotechnology.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC

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Source: Health & Medicine Week

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