6533b82afe1ef96bd128b86c

RESEARCH PRODUCT

Intrinsic superoxide dismutase activity of MnO nanoparticles enhances the magnetic resonance imaging contrast

S. PreißAnna-maria SchilmannMuhammad Nawaz TahirRuben RaggP. BlümlerC. WieseotteWolfgang TremelKatja HeinzeJana HerzbergerHolger FreyMartin KluenkerFilipe NatalioMelanie VielL. VölkerKarsten Korschelt

subject

Biomedical EngineeringNanoparticle02 engineering and technology010402 general chemistry01 natural sciencesSuperoxide dismutasechemistry.chemical_compoundNuclear magnetic resonancemedicineGeneral Materials Sciencechemistry.chemical_classificationmedicine.diagnostic_testbiologySuperoxideCancerMagnetic resonance imagingGeneral ChemistryGeneral Medicine021001 nanoscience & nanotechnologymedicine.disease0104 chemical sciencesEnzymechemistryCancer cellBiophysicsbiology.protein0210 nano-technologyIntracellular

description

Superoxide radicals are associated with the development of many severe diseases, such as cancer. Under nonpathogenic conditions, the natural enzyme superoxide dismutase (SOD) regulates the intracellular superoxide concentrations, but nearly all tumor tissues show reduced SOD levels. Selective imaging in early progression stages remains a key requirement for efficient cancer diagnosis and treatment. Magnetic resonance imaging (MRI) as a noninvasive tool with high spatial resolution may offer advantages here, but MRI contrast agents exhibiting a redox-triggered change in the image contrast towards superoxide radicals have not been reported so far. Here we show that manganese oxide (MnO) nanoparticles (NPs) exhibit an intrinsic SOD-like activity, which is higher than that of the native Mn-dependent SOD. In addition, MnO NPs significantly enhance the MRI contrast when exposed to superoxide radicals, making them responsive MRI contrast agents for the treatment and imaging of cancer cells with reduced SOD levels.

yearjournalcountryeditionlanguage
2020-04-09Journal of Materials Chemistry B
https://doi.org/10.1039/c6tb02078j