The Hidden Gatekeepers: Aquaporins at the Crossroads of Metabolism and the Mind

Aquaporins (AQPs) are membrane proteins that form channels to move water and small solutes such as glycerol across cells. 13 types of AQPs exist in humans, each with specific roles depending on the tissue where they are found. Their proper activities vital for maintaining water balance, energy regulation and over all health. When their function altered many metabolic and neurological diseases may arise. In fat tissue and pancreas, AQP7 controls glycerol transport and influences insulin release. Reduced activity of this channel leads to fat buildup, altered lipid metabolism and contribute to obesity and type 2 diabetes. In the liver AQP8 supports water, bile and ammonia transport. Dysfunction of AQP8 disrupts fat regulation and strongly linked to non-alcoholic fatty liver diseases (NAFLD). In the brain and final cord AQP4is highly expressed in astrocytes. It becomes the target of harmful antibodies in neuromyelitis optica spectrum disorder (NMOSD) leading to inflammation and nerve damage. Overall, AQPs are not only water channels but also regulators of key metabolic and neurological processes.