title: Habituation-Like Decrease of Acetylcholine-Induced Inward Current in Helix Command Neurons: Role of Microtubule Motor Proteins.
abstract: The role of kinesin and dynein microtubule-associated molecular motors in the cellular mechanism of depression of acetylcholine-induced inward chloride current (ACh-current) was examined in command neurons of land snails (Helix lucorum) in response to repeated applications of ACh to neuronal soma. This pharmacological stimulation imitated the protocol of tactile stimulation evoking behavioural habituation of the defensive reaction. In this system, a dynein inhibitor (erythro-9-(2-hydroxy-3-nonyl)adenine, 50 µM) decreased the ACh-current depression rate. Kinesin Eg5 inhibitors (Eg5 inhibitor III, 10 µM and Eg5 inhibitor V, trans-24, 15 µM) reduced the degree of current depression, and Eg5 inhibitor V also reduced the initial rate of depression. The results of electrophysiological experiments in combination with mathematical modelling provided evidence of the participation of dyneins and kinesin Eg5 proteins in the radial transport of acetylcholine receptors in command neurons of H. lucorum in the cellular analogue of habituation. Furthermore, these results suggest that the reciprocal interaction between dynein and kinesin proteins located on the same vesicle can lead to reverse their usual direction of transport (dyneins-in exocytosis and kinesin Eg5-in endocytosis).
authors: Department of Higher Nervous Activity, Faculty of Biology, Moscow Lomonosov State University, Leninskie Gory dom 1, Stroenie 12, Moscow, 119991, Russia.
authors: Natal'ya A
authors: NA
authors: Vasil'yeva
authors: Galina B
authors: GB
authors: Murzina
authors: Arkady S
authors: AS
authors: Pivovarov
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology*; D000225:Adenine / Q000031:analogs & derivatives / Q000494:pharmacology; D000818:Animals; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism; D004398:Dyneins / Q000037:antagonists & inhibitors / Q000378:metabolism; D006185:Habituation, Psychophysiologic / Q000187:drug effects*; D006372:Helix, Snails / Q000187:drug effects / Q000502:physiology*; D015640:Ion Channel Gating / Q000187:drug effects*; D016547:Kinesins / Q000037:antagonists & inhibitors / Q000378:metabolism; D008868:Microtubule Proteins / Q000378:metabolism*; D020409:Molecular Motor Proteins / Q000378:metabolism*; D009474:Neurons / Q000187:drug effects / Q000502:physiology*; D011950:Receptors, Cholinergic / Q000378:metabolism
chemical_list: D008868:Microtubule Proteins; D020409:Molecular Motor Proteins; D011950:Receptors, Cholinergic; C010192:9-(2-hydroxy-3-nonyl)adenine; D004398:Dyneins; D016547:Kinesins; D000225:Adenine; D000109:Acetylcholine