Gold Nanoparticles Coated with Gd-Chelate as a Potential CT/MRI Bimodal Contrast Agent
作者:Nasiruzzaman Sk Md.、Hee-Kyung Kim、Ji-Ae Park、Yong-Min Chang、Tae-Jeong Kim
DOI:10.5012/bkcs.2010.31.5.1177
日期:2010.5.20
The synthesis and characterization of gold nanoparticles coated by Gd-chelate (GdL@Au) is described, where L is a conjugate of DTPA (DTPA = diethylenetriamine-N,N,N',N",N"-pentaacetic acid) and 4-aminothiophenol. These particles are obtained by the replacement of citrate from the gold nanoparticle surfaces with gadolinium chelate (GdL). The average size of GdL@Au is 12 nm with a loading of GdL reaching up to $1.4\times}10^3$ per particles, and they demonstrate very high r1 relaxivity ($\sim}10^4mM^-1}s^-1}$) and the r1 relaxivity per [Gd] is as high as $10mM^-1}s-1}$. Here, we also describe the use of bimodality of this contrast agent (CA) as a highly efficient CT contrast agent based on gold nanoparticles (GNPs) that overcome the limitations of iodine based contrast agent. The MTT assay performed on this CAs reveals the cytotoxicity as low as that for Omniscan$^(R)}$ in the concentration range required to obtain intensity enhancement in the in vivo MRI study.
Controlled assembly of heterometallic lanthanide(III) macrocycles: incorporation of photoactive and highly paramagnetic metal centres within a single complex
作者:David J. Lewis、Federica Moretta、Zoe Pikramenou
DOI:10.1080/10610278.2011.632823
日期:2012.2.1
and Gd3+ lanthanide centres, and has potential as a dual output probe for visible emission and magnetic resonance imaging measurements. The Eu3+ emission is perturbed compared to an isoabsorptive non-macrocyclic equivalent complex, EuL x . Macrocycle M2 incorporates Eu3+ and Nd3+ lanthanide centres for dual optical output in the visible and near-infrared regions of the electromagneticspectrum. We demonstrate
Luminescent nanobeads: attachment of surface reactive Eu(iii) complexes to gold nanoparticles
作者:David J. Lewis、Thomas M. Day、Julie V. MacPherson、Zoe Pikramenou
DOI:10.1039/b518091k
日期:——
Gold nanoparticles were used as a scaffold to assemble multiple tailor-made europium(III) complexes yielding water-soluble gold nanoparticles that display red, EuIII, luminescence.
Selective Aggregation of a Platinum-Gadolinium Complex Within a Tumor-Cell Nucleus
作者:Ellen L. Crossley、Jade B. Aitken、Stefan Vogt、Hugh H. Harris、Louis M. Rendina
DOI:10.1002/anie.200902309
日期:——
Treatment of A549 human lung carcinoma cells with a DNA metallointercalator complex results in the selectiveaggregation of the intact drug within the cell nuclei, as determined by synchrotron X‐ray fluorescence (XRF) imaging (see images). This work is the first example of gadolinium delivery by a platinum complex to a tumor‐cell nucleus.
Hairpin-Shaped Heterometallic Luminescent Lanthanide Complexes for DNA Intercalative Recognition
作者:Peter B. Glover、Peter R. Ashton、Laura J. Childs、Alison Rodger、Michael Kercher、René M. Williams、Luisa De Cola、Zoe Pikramenou
DOI:10.1021/ja029886s
日期:2003.8.1
Luminescent Ln-Pt2 metallohairpin complexes have been developed, and their intercalative recognition with DNA has been demonstrated with linear dichroism spectroscopy. The heterotrimetallic complexes were formed in a one-step reaction, by assembly of an aminopolycarboxylate ligand, a platinum terpyridine unit, and the lanthanide salt. The metallohairpin complexes bear a neutral lanthanide moiety and two positively charged platinum-containing intercalating units. The Nd(III) analogues are luminescent in the near infrared, and this near-IR luminescence is retained upon binding to DNA. The DNA recognition was demonstrated by linear dichroism spectroscopy. The linear dichroism spectra suggested that the complexes bind perpendicular to the DNA helical axis, confirming intercalative recognition accompanied by dramatic stiffening of DNA, which suggests bis-intercalation of the complex.