WSU-HN6 Cells

WSU-HN6 is a human squamous cell carcinoma (SCC) cell line derived from a tumor of the upper aerodigestive tract, specifically from the base of the tongue. It is part of a comprehensive panel of head and neck squamous cell carcinoma (HNSCC) cell lines established to model the biology of these cancers. WSU-HN6 has been instrumental in characterizing molecular alterations common in HNSCC, particularly those involving cell cycle regulation and growth signaling pathways.

This cell line exhibits elevated activity of cyclin-dependent kinases (CDKs), particularly CDK4 and CDK6, consistent with the inactivation of the tumor suppressor p16INK4A. While many HNSCC cell lines show overexpression of cyclin D1, WSU-HN6 does not, suggesting alternate routes to CDK activation, such as kinase overexpression or loss of negative regulators. Additionally, WSU-HN6 expresses wild-type p53, yet displays deregulation of cell cycle control, implicating other molecular defects, including potential deficiencies in p21 function or regulation.

Functionally, WSU-HN6 demonstrates elevated tyrosine phosphorylation, reflective of aberrant activation of growth-promoting receptor tyrosine kinases. Enhanced epidermal growth factor receptor (EGFR) activity has been documented in this cell line, though EGFR protein overexpression is modest compared to other cell lines in the same panel. The EGFR in WSU-HN6 remains responsive to ligand stimulation and is functionally intact. These features position WSU-HN6 as a valuable in vitro model for studying deregulated growth signaling and CDK pathway abnormalities in head and neck cancers.