Syndecan-binding protein 1 (SDCBP)

Syndecan-binding protein 1 (SDCBP), also known as Syntenin-1 or MDA-9, is a multifunctional PDZ domain-containing adaptor protein that serves as a critical scaffold for various cellular processes, including exosome biogenesis, transmembrane protein trafficking, and signal transduction (UniProt O00560). It facilitates the assembly of signaling complexes by interacting with the cytoplasmic tails of syndecans, tetraspanins, and growth factor receptors such as EGFR and TGF-βR1 (GeneCards). In oncology, SDCBP is frequently overexpressed and acts as a pro-metastatic factor, promoting tumor cell migration, invasion, and epithelial-mesenchymal transition (EMT) through the activation of FAK/Src, MAPK, and NF-κB pathways (PubMed: 26291527). It also plays a role in immune evasion by upregulating PD-L1 and modulating the tumor microenvironment to favor cancer progression (PNAS, 2021). Beyond cancer, SDCBP is involved in neurodevelopmental processes like synaptic transmission and has been implicated in inflammatory responses and heart failure progression (Frontiers in Immunology, 2022). Given its central role in cancer dissemination and exosome-mediated communication, SDCBP is an emerging therapeutic target, with several small-molecule inhibitors targeting its PDZ domains, such as PDZ1i and SYNTi, currently under preclinical investigation (MedChemExpress).

Other names

Syntenin-1Melanoma differentiation-associated protein 9MDA-9Pro-TGF-alpha cytoplasmic domain-interacting protein 18TACIP18Scaffold protein Pbp1

Inhibition of PDZ domain-mediated protein-protein interactions to disrupt oncogenic signaling and exosome secretion.