S100 calcium-binding protein A2 (S100A2), S100 calcium-binding protein A6 (S100A6), and S100 calcium-binding protein P (S100P) (S100A2/A6/P)

S100A2, S100A6, and S100P are members of the S100 family of EF-hand calcium-binding proteins that play critical roles in calcium-dependent signal transduction [PMC2761571, PMC9819344, PMC9319044]. These proteins are often grouped together in pharmacological research due to their shared ability to interact with specific extracellular ligands, such as the Receptor for Advanced Glycation Endproducts (RAGE) and various four-helical cytokines including erythropoietin (EPO) and interferon-beta (IFN-beta) [Stern et al. 2011, Permyakov et al. 2022]. In many pathological conditions, particularly in cancers like non-small cell lung cancer (NSCLC) and pancreatic adenocarcinoma, these proteins are overexpressed and contribute to tumor cell proliferation, migration, and survival [PMC3220824, PMC9824544, NCBI Gene 6273]. They also modulate inflammatory responses and have been implicated in cardiovascular and neurodegenerative diseases [PMC9824544, PMC9819344, MDPI 2021]. Therapeutic strategies targeting this group involve small molecule inhibitors, such as cromolyn and certain anti-allergy drugs (e.g., amlexanox, tranilast), which block the interaction between S100 proteins and their downstream effectors [PMC2761571, Stern et al. 2011]. Additionally, their elevated levels in serum make them valuable diagnostic and prognostic biomarkers for monitoring disease progression and treatment efficacy [PMC9824544, NCBI Gene 6273, Permyakov et al. 2022].

Other names

S100A2 (CAN19)S100A6 (Calcyclin)S100PProtein S100-A2Protein S100-A6Protein S100-P2A95B10CABPCacyGrowth factor-inducible protein 2A9Prolactin receptor-associated protein (PRA)

Inhibition of S100-target protein interactions. These drugs bind to the hydrophobic pocket of S100 proteins (A2, A6, or P), preventing their interaction with downstream effectors such as RAGE, p53, or cytokines (EPO, IFN-beta), thereby blocking signaling pathways that promote tumor growth, metastasis, and inflammation [PMC2761571, Stern et al. 2011, Permyakov et al. 2022].