The characteristics of sub 10 nm manganese oxide T1 contrast agents of different nanostructured morphologies.
There is continuous interest in developing manganese-based T(1) contrast agents. While much effort has been made to synthesize manganese chelates, the development of manganese-based nanoparticle, particularly manganese oxides, as MRI contrast agents is burgeoning. In this report, sub-10-nm nanospheres, nanoplates, and nanocubes of Mn(3)O(4) were synthesized and exhibited paramagnetic behavior at room temperature on the basis of superconducting quantum interference devices (SQUID) measurements. The surface Mn(3+) passivated nanoplates examined by x-ray photoelectron spectroscopy (XPS) had the largest r(1) relaxivity of the reported manganese oxide nanoparticles. The MR labeling assays of Mn(3)O(4) nanoplate-treated A549 lung cancer cells showed that MR signals increased to 139% in T(1)-weighted images compared with untreated cells when the Mn ion concentration went down to 1.3 x 10(-2) mM. A dark field illumination microscope was employed to monitor Mn(3)O(4) nanoplates internalized into cells as a function of time.
Department of Chemistry, National Cheng Kung University, Tainan, Taiwan.
Chih-Chia
CC
Huang
Ngee-Huat
NH
Khu
Chen-Sheng
CS
Yeh
D016923:Cell Death / Q000187:drug effects; D045744:Cell Line, Tumor; D003287:Contrast Media / Q000737:chemistry* / Q000494:pharmacology*; D003952:Diagnostic Imaging; D006801:Humans; D008279:Magnetic Resonance Imaging; D008280:Magnetics; D017895:Manganese Compounds / Q000737:chemistry* / Q000494:pharmacology*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010087:Oxides / Q000737:chemistry* / Q000494:pharmacology*; D010316:Particle Size; D056951:Photoelectron Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared
D003287:Contrast Media; D017895:Manganese Compounds; D010087:Oxides; C027424:manganese oxide