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FeTMPyP is a synthetic porphyrin complexed with iron, which acts as a peroxynitrite decomposition catalyst. The rate constant for decomposition of peroxynitrite by FeTMPyP is 2.2 x 10⁶ M⁻¹s⁻¹ with a turnover number of 360 ± 170 s⁻¹. The predominant product (>90%) of this reaction is nitrate, with a minor amount of nitrite also formed (~6%), at pH 7.4.

FeTMPyP is an orally active peroxynitrite (ONOO ) scavenger. FeTMPyP reduces nitrative stress and increases autophagy. FeTMPyP reduces PARP over-activation and neuroinflammation in chronic constriction injury (CCI)-induced rats, and ameliorates functional, behavioral and biochemical deficits[1][2].

[1] Zhang S, et al. Nitrative Stress-Related Autophagic Insufficiency Participates in Hyperhomocysteinemia-Induced Renal Aging. Oxid Med Cell Longev. 2020 Jan 25;2020:4252047. DOI:10.1155/2020/4252047
[2] Komirishetty P, et al. FeTMPyP a peroxynitrite decomposition catalyst ameliorated functional and behavioral deficits in chronic constriction injury induced neuropathic pain in rats. Free Radic Res. 2021 Oct;55(9-10):1005-1017. DOI:10.1080/10715762.2021.2010731