Serine Threonine Kinase 17A maintains the epithelial state in colorectal cancer cells.

Serine Threonine Kinase 17A (STK17A) is a ubiquitously expressed kinase originally identified as a regulator of apoptosis; however, whether it functionally contributes to colorectal cancer (CRC) has not been established. Here, we have analyzed STK17A in CRC and demonstrate decreased expression of STK17A in primary tumors which is further reduced in metastatic lesions, indicating a potential role in regulating the metastatic cascade. Interestingly, changes in STK17A expression did not modify proliferation, apoptosis, or sensitivity of CRC cell lines to treatment with the chemotherapeutic 5-fluorouracil. Instead, STK17A knockdown induced a robust mesenchymal phenotype consistent with the epithelial-mesenchymal transition, including spindle-like cell morphology, decreased expression of adherens junction proteins, and increased migration and invasion. Additionally, overexpression of STK17A decreased cell size and induced wide-spread membrane blebbing, a phenotype often associated with activation of cell contractility. Indeed, STK17A overexpressing cells displayed heighted phosphorylation of myosin light chain in a manner dependent on STK17A catalytic activity. Finally, patient-derived tumor organoid cultures were used to more accurately determine STK17A's effect in primary human tumor cells. Loss of STK17A induced morphological changes, decreased E-cadherin, increased invasion, and augmented organoid attachment on 2D substrates, all-together suggesting a more metastatic phenotype. Collectively, these data indicate a novel role for STK17A in regulation of epithelial phenotypes and indicate its functional contribution to CRC invasion and metastasis. Implications: Loss of serine threonine kinase 17A occurs in colorectal cancer metastasis, induces mesenchymal morphologies, and contributes to tumor cell invasion and migration in colorectal cancer.