CAY-10514 is primarily used in biochemical research as a selective inhibitor of protein kinase D (PKD). It is employed to study the role of PKD in various cellular processes, including signal transduction, cell proliferation, and apoptosis. Researchers utilize CAY-10514 to investigate its potential therapeutic effects in diseases where PKD activity is implicated, such as cancer, cardiovascular disorders, and inflammation. Its application helps in understanding the molecular mechanisms of PKD and its interaction with other cellular pathways, aiding in the development of targeted therapies.