Molecular Magnetic Resonance Imaging Using a Redox-Active Iron Complex.

ABSTRACT: We introduce a redox-active iron complex, Fe-PyC3A, as a biochemically responsive MRI contrast agent. Switching between Fe³⁺-PyC3A and Fe²⁺-PyC3A yields a full order of magnitude relaxivity change that is field-independent between 1.4 and 11.7 T. The oxidation of Fe²⁺-PyC3A to Fe³⁺-PyC3A by hydrogen peroxide is very rapid, and we capitalized on this behavior for the molecular imaging of acute inflammation, which is characterized by elevated levels of reactive oxygen species.  Injection of Fe²⁺-PyC3A generates strong, selective contrast enhancement of inflamed pancreatic tissue in a mouse model (caerulein/LPS model). No significant signal enhancement is observed in normal pancreatic tissue (saline-treated mice). Importantly, signal enha

SUBMITTER: Wang H 

PROVIDER: S-EPMC6726119 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature