AQP1, or Aquaporin 1, is a protein that functions as a water channel in cell membranes. It facilitates the transport of water molecules in and out of cells, playing a crucial role in maintaining fluid balance in various tissues. AQP1 is found in many parts of the body, including the kidneys, eyes, and brain, where it helps regulate water homeostasis. This protein is part of a larger family of aquaporins, which are essential for various physiological processes. Dysfunction or mutations in AQP1 can lead to health issues, such as kidney disorders and problems with fluid regulation. Understanding AQP1 is important for developing treatments for these conditions.