Two-pore-Domain (KCNK) potassium channels: dynamic roles in neuronal function

Area of Science:

• Neuroscience
• Molecular Biology
• Physiology

Background:

• Leak K+ currents significantly influence resting membrane potential and neuronal excitability.
• A family of "two-pore-domain" leak K+ channels has been identified, characterized by two pore-forming regions per subunit.
• These channels exhibit minimal voltage and time dependence, contributing to a steady K+ efflux.

Purpose of the Study:

• To review the diverse roles of leak K+ channels in central nervous system (CNS) function.
• To discuss the molecular substrates underlying the modulation of these channels.
• To highlight the significance of two-pore-domain channels in neuronal processes.

Main Methods:

• Literature review of studies on leak K+ channels and their functions.
• Analysis of research on the structure and properties of two-pore-domain K+ channels.
• Synthesis of evidence linking channel modulation to CNS activity.

Main Results:

• Leak K+ channels are modulated by various endogenous compounds, clinical agents, and physicochemical factors.
• Modulation encompasses neurotransmitters, anesthetics, temperature, pH, oxygen, and osmolarity.
• Long-term regulation occurs through alterations in gene expression.

Conclusions:

• Two-pore-domain K+ channels are key molecular players in CNS function.
• Their modulation by diverse factors impacts neuronal excitability and overall brain activity.
• Understanding these channels is vital for comprehending neurological processes and potential therapeutic targets.