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Although there are several FDA-approved treatments for Alzheimer’s disease (AD), only recently have disease-modifying therapies received approval for use in patients. In this narrative review, we examine the history of aquaporin-4 (AQP4) as a therapeutic target for NMOSD (neuromyelitis optica spectrum disorder) and as a potential therapeutic target for AD. We review the basic science and discovery of AQP4, a transmembrane water-channel essential to regulating water balance in the central nervous system (CNS). We also review the pathogenesis of NMOSD, an autoimmune disease characterized by the destruction of cells that express AQP4. Then, we review how AQP4 is likely involved in the pathogenesis of Alzheimer’s disease (AD). Finally, we discuss future challenges with drug design that would modulate AQP4 to potentially slow AD development. The literature search for this article consisted of searching Google Scholar and PubMed for permutations of the keywords ‘Alzheimer’s disease,’ ‘aquaporin-4,’ ‘neuromyelitis optica,’ and their abbreviations. We place research into AQP4 into context with other recent developments in AD research. A major difficulty with drug development for Alzheimer’s is the lack of strategies to cleanly target the early pathogenesis of the disease. Targeting AQP4 may provide such a strategy.

The aquaporin-4 water channel and updates on its potential as a drug target for Alzheimer’s disease