CP-28888 is primarily utilized in the field of pharmacology as a selective inhibitor of phosphodiesterase type 4 (PDE4). This enzyme plays a crucial role in regulating intracellular levels of cyclic AMP, which is involved in various cellular processes. By inhibiting PDE4, CP-28888 helps in reducing inflammation and modulating immune responses, making it a potential candidate for treating inflammatory diseases such as asthma, chronic obstructive pulmonary disease (COPD), and rheumatoid arthritis. Additionally, its ability to enhance cognitive function and memory retention has sparked interest in its potential application for neurodegenerative disorders like Alzheimer's disease. Research is ongoing to explore its efficacy and safety in these therapeutic areas.