TRAAK アクチベーター

TRAAK (TWIK-related arachidonic acid-activated K+ channel) is a potassium channel protein encoded by the KCNK4 gene. It belongs to the family of two-pore-domain potassium (K2P) channels, which are responsible for generating background or 'leak' potassium currents that help to control the resting membrane potential and the overall excitability of neurons. TRAAK channels are unique among K2P channels due to their activation by mechanical stretch and polyunsaturated fatty acids, such as arachidonic acid.Expressed predominantly in the brain and peripheral nervous system, TRAAK channels are involved in the sensation of pain, temperature, and mechanical stimuli. They are mechanosensitive, responding to changes in membrane tension, which makes them important for neurons that need to adapt to varying mechanical forces. This sensitivity to physical deformation allows TRAAK channels to contribute to the protection of neurons from damage caused by swelling or other mechanical stresses.

TRAAK channels are also temperature-sensitive, displaying an increased activity at higher temperatures, which suggests a role in thermosensation. Their modulation by arachidonic acid and other lipids indicates that they can respond to changes in the local lipid environment, linking cellular metabolism to neuronal excitability.The physiological functions of TRAAK channels are still being explored, but they are thought to be important in protecting neurons under stress and in the normal functioning of the nervous system.