[Neuronal background two-P-domain potassium channels: molecular and functional aspects]

Area of Science:

• Neuroscience
• Molecular Biology
• Physiology

Context:

• Background potassium (K+) conductances are crucial for neuronal excitability, determining membrane resting potential and input resistance.
• Two-pore domain potassium (K2P) channels, distinct from Kv, KCa, and Kir channels, are voltage- and time-independent and largely insensitive to common K+ channel blockers.
• K2P channels, including TASK and TREK subunits, are widely expressed in the nervous system and contribute to the resting potential of various neuron types.

Purpose:

• To review the characteristics and physiological roles of background K+ channels, particularly K2P channels.
• To highlight the diverse regulatory mechanisms of K2P channels by physical and chemical stimuli.
• To underscore the therapeutic potential of K2P channels, evidenced by their activation by clinical compounds.

Summary:

• K2P channels are background K+ channels that establish resting membrane potential and are regulated by numerous factors like pH, temperature, and lipids.
• These channels are insensitive to classical blockers but are modulated by neurotransmitters and activated by anesthetics and neuroprotective agents.
• Regulation of K2P channels significantly impacts neuronal excitability, with implications for synaptic modulation and potential drug development.

Impact:

• Understanding K2P channel regulation provides insights into neuronal excitability and fundamental processes like learning.
• The sensitivity of K2P channels to clinical compounds suggests their promise as targets for novel therapeutic strategies.
• This research opens avenues for developing drugs that modulate neuronal excitability for treating neurological disorders.