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Succinyl phosphonate is an α-ketoglutarate dehydrogenase (KGDHC) inhibitor, effective inhibits (KGDHC) in muscle, bacterial, brain, and cultured human fibroblasts[1][4]. Succinyl phosphonate trisodium salt is an 2-oxoglutarate dehydrogenase (OGDH) inhibitor, impairs viability of cancer cells in a cell-specific metabolism-dependent manner[2]. Succinyl phosphonate trisodium salt inhibits the glutamate-induced ROS production in glutamate-stimulated hippocampal neurons in situ[3].

[1] Biryukov AI, et al. Succinyl phosphonate inhibits alpha-ketoglutarate oxidative decarboxylation, catalyzed by alpha-ketoglutarate dehydrogenase complexes from E. coli and pigeon breast muscle. FEBS Lett. 1996 Mar 11;382(1-2):167-70. DOI:10.1016/0014-5793(96)00166-4
[2] Bunik VI, et al. Phosphonate analogues of alpha-ketoglutarate inhibit the activity of the alpha-ketoglutaratedehydrogenase complex isolated from brain and in cultured cells. Biochemistry. 2005 Aug 9;44(31):10552-61. DOI:10.1021/bi0503100
[3] Zündorf G, et al. alpha-Ketoglutarate dehydrogenase contributes to production of reactive oxygen species in glutamate-stimulated hippocampal neurons in situ. Neuroscience. 2009 Jan 23;158(2):610-6. DOI:10.1016/j.neuroscience.2008.10.015
[4] Bunik VI, et al. Phosphonate analogues of alpha-ketoglutarate inhibit the activity of the alpha-ketoglutarate dehydrogenase complex isolated from brain and in cultured cells. Biochemistry. 2005 Aug 9;44(31):10552-61. DOI:10.1021/bi0503100