T-lymphoma invasion and metastasis-inducing protein 1 (TIAM1) (TIAM1)

T-lymphoma invasion and metastasis-inducing protein 1 (TIAM1) is a guanine nucleotide exchange factor (GEF) that specifically activates the Rho-family GTPase Rac1 by facilitating the exchange of GDP for GTP (UniProt Q13009). It plays a fundamental role in regulating the actin cytoskeleton, cell-cell adhesion, and cell polarity, which are essential for normal cellular processes like migration and axon growth (PubMed: 25605334). In the context of oncology, TIAM1 is frequently overexpressed and acts as a potent oncogene, promoting the epithelial-to-mesenchymal transition (EMT), invasion, and metastasis in various cancers, including T-cell lymphoma and breast cancer (PubMed: 28651551). Because of its central role in driving metastatic phenotypes, TIAM1 is considered a high-value therapeutic target. Current drug discovery efforts focus on small molecules that disrupt the interaction between TIAM1 and Rac1, thereby preventing the downstream signaling that leads to tumor progression (PubChem: NSC23766). However, targeting TIAM1 presents challenges due to its involvement in normal physiological processes such as immune response and neuronal signaling (PubMed: 15107404). This protein's dual role in both promoting and potentially suppressing certain tumor types depending on the cellular context adds complexity to its therapeutic application.

Other names

TIAM-1T-cell lymphoma invasion and metastasis 1

Inhibition of the TIAM1-Rac1 interaction to prevent Rac1 activation and subsequent cell migration and invasion.