Recovery from muscarinic modulation of M current channels requires phosphatidylinositol 4,5-bisphosphate synthesis - PubMed (original) (raw)
Recovery from muscarinic modulation of M current channels requires phosphatidylinositol 4,5-bisphosphate synthesis
Byung-Chang Suh et al. Neuron. 2002.
Free article
Abstract
Suppression of M current channels by muscarinic receptors enhances neuronal excitability. Little is known about the molecular mechanism of this inhibition except the requirement for a specific G protein and the involvement of an unidentified diffusible second messenger. We demonstrate here that intracellular ATP is required for recovery of KCNQ2/KCNQ3 current from muscarinic suppression, with an EC(50) of approximately 0.5 mM. Substitution of nonhydrolyzable ATP analogs for ATP slowed or prevented recovery. ADPbetaS but not ADP also prevented the recovery. Receptor-mediated inhibition was irreversible when recycling of agonist-sensitive pools of phosphatidylinositol-4,5-bisphosphate (PIP(2)) was blocked by lipid kinase inhibitors. Lipid phosphorylation by PI 4-kinase is required for recovery from muscarinic modulation of M current.
Comment in
- M current mystery messenger revealed?
Ikeda SR, Kammermeier PJ. Ikeda SR, et al. Neuron. 2002 Aug 1;35(3):411-2. doi: 10.1016/s0896-6273(02)00792-4. Neuron. 2002. PMID: 12165463 Review.
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