Tetraspanin-1 (TSPAN1)

Tetraspanin-1 (TSPAN1) is a member of the tetraspanin family of four-pass transmembrane proteins that function as membrane scaffolds, forming tetraspanin-enriched microdomains which regulate signal transduction, cell proliferation, apoptosis, migration, invasion, and membrane organization. TSPAN1 is broadly expressed but is upregulated in several human cancers—including hepatocellular, gastric, pancreatic, colorectal, cholangiocarcinoma, and breast cancer—where it promotes cell cycle progression via PI3K/Akt and EGFR/ERK signaling pathways, facilitating tumor growth and metastasis. Experimental inhibition of TSPAN1 in cancer models via siRNA results in reduced proliferation, migration, and tumorigenicity. No approved drugs target TSPAN1 directly, but it is under investigation as a potential therapeutic and prognostic target in oncology. Tetraspanin family proteins generally consist of four transmembrane helices, a small and a large extracellular loop stabilized by disulfide bonds, and short cytoplasmic N- and C-terminals. TSPAN1’s structure enables protein-protein interactions crucial for organizing membrane signaling domains and regulating cell behavior in health and disease.

Other names

TSPAN1Tspan-1Tetraspanin-1TSPAN-1NET-1Tetraspan NET-1Tetraspanin TM4-CNET1TM4CTM4SFtetraspanin-1tetraspan 1

Inhibition of TSPAN1 via siRNA reduces cancer cell proliferation and invasion, induces cell cycle arrest, and may promote apoptosis RNA interference and nanobubble-mediated siRNA delivery block TSPAN1 activity in tumor xenograft models resulting in extended survival