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- W1971021330 abstract "We used patch-clamp recordings and fast optical Ca 2+ imaging to characterize an acetylcholine-induced current ( I ACh ) in leg motoneurons of the stick insect Carausius morosus. Our long-term goal is to better understand the synaptic and integrative properties of the leg sensory-motor system, which has served extremely successfully as a model to study basic principles of walking and locomotion on the network level. The experiments were performed under biophysically controlled conditions on freshly dissociated leg motoneurons to avoid secondary effects from the network. To allow for unequivocal identification, the leg motoneurons were backfilled with a fluorescent label through the main leg nerve prior to cell dissociation. In 87% of the motoneurons, I ACh consisted of a fast-desensitizing ( I ACh1 ) and a slow-desensitizing component ( I ACh2 ), both of which were concentration dependent, with EC 50 values of 3.7 × 10 −5 and 2.0 × 10 −5 M, respectively. Ca 2+ imaging revealed that a considerable portion of I ACh (∼18%) is carried by Ca 2+ , suggesting that I ACh , besides mediating fast synaptic transmission, could also induce Ca 2+ -dependent processes. Using specific nicotinic and muscarinic acetylcholine receptor ligands, we showed that I ACh was exclusively mediated by nicotinic acetylcholine receptors. Distinct concentration–response relations of I ACh1 and I ACh2 for these ligands indicated that they are mediated by different types of nicotinic acetylcholine receptors." @default.
- W1971021330 created "2016-06-24" @default.
- W1971021330 creator A5001013872 @default.
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- W1971021330 creator A5050318328 @default.
- W1971021330 creator A5087613872 @default.
- W1971021330 date "2010-05-01" @default.
- W1971021330 modified "2023-09-24" @default.
- W1971021330 title "Cholinergic Currents in Leg Motoneurons of<i>Carausius morosus</i>" @default.
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