mn(iii)tmpyp

Mn(III)TMPyP is a manganese-porphyrin which acts as a superoxide dismutase (SOD) mimetic and peroxynitrite decomposition catalyst. SOD mimetics described to date are unstable and are capable of catalyzing undesired side-reactions in addition to the dismutation of the superoxide radical (O2-). Mn(III)TMPyP is an SOD mimetic with increased stability to pH and hydrogen peroxide. The rate constant for superoxide dismutation and peroxynitrite decomposition are 3.9 x 107 M-1s-1 and ~2 x 106 M-1s-1, respectively. Mn(III)TMPyP protected and enhanced the growth of SOD E. coli with a doubling time of 60 minutes (as compared to 240 minutes of the control) at 25 µM.

Mn(III) protoporphyrin IX chloride, a metalloporphyrin, at 10 µM concentration, promotes mRNA expression of δ-aminolevulinate synthase and heme oxygenase (HO) in chick embryo liver cells, critical enzymes for heme biosynthesis and breakdown. It has been used in nanobialys for MRI of fibrin clots in vitro and in the creation of Mn(III) protoporphyrin IX-6(7)-glycyl-glycyl-L-histidine methyl ester (MnGGH), a metalloporphyrin conjugate with microperoxidase activity.