anion channel

An anion channel is a type of protein found in the cell membrane of virtually all living cells. Its primary function is to create a pathway that allows negatively charged ions, known as anions (like chloride ions), to pass through the otherwise impermeable lipid bilayer of the membrane.12

These channels are crucial for various physiological processes, including nerve signaling and muscle contraction. They are often "gated," meaning they can open and close in response to specific stimuli, such as changes in voltage across the membrane or the binding of signaling molecules. While some channels are selective for specific ions, others allow passage of all anions or all cations (positively charged ions). Malfunctions in ion channels, including anion channels, can lead to a range of disorders known as channelopathies, such as epilepsy and cystic fibrosis.123