1-amino-3-(4-methylphenyl)pyrido[1,2-a]benzimidazole-2,4-dicarbonitrile

ChEBI: IFSP1 is a member of the class of pyridobenzimidazoles that is pyrido[1,2-a]benzimidazole substituted by amino, cyano, 4-methylphenyl, and cyano groups at positions 1, 2, 3 and 4, respectively. It is a potent inhibitor of ferroptosis suppressor protein 1 (FSP1) with EC50 of 103 nM. It induces ferroptosis in GPX4 knockout cells that overexpress FSP1. It has a role as a ferroptosis inducer, an antineoplastic agent and a ferroptosis suppressor protein 1 inhibitor. It is a member of toluenes, a nitrile, a primary amino compound, an aromatic amine and a pyridobenzimidazole.

iFSP1 is a potent, selective and glutathione-independent inhibitor of ferroptosis suppressor protein 1 (FSP1/AIFM2) with EC50 of 103 nM. It selectively induces ferroptosis in FSP1-overexpressing GPX4 knockout Pfa1 cells and HT1080 cells.

iFSP1 (0.001-1 μM; 24 hours) inhibits the Gpx4-knockout cell growth as a dose-dependent manner, but does not inhibit the wild type cell growth. Treatment with the ferroptosis inhibitor Lip-1 protects GPX4 - knockout cells from iFSP1-induced ferroptosis. It (0.001-1 μM; 24 hours) is less efficient than genetic deletion of FSP1, whereas iFSP1 treatment in the FSP1-knockout background had no additive effect to RSL3-induced ferroptosis.iFSP1 (3 μM; 24 hours) treatment results in an obvious toxicity of RSL3 in a panel of genetically engineered (FSP1-knockout) human cancer cell lines.

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