Role of membrane potential in calcium signaling during rhythmic bursting in tritonia swim interneurons.

Role of membrane potential in calcium signaling during rhythmic bursting in tritonia swim interneurons. Research Abstract Details 

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Role of membrane potential in calcium signaling during rhythmic bursting in tritonia swim interneurons. Abstract Text:

Evan S Hill,Paul S Katz,

Rhythmic bursting in neurons is accompanied by dynamic changes in intracellular Ca(2+) concentration. These Ca(2+) signals may be caused by membrane potential changes during bursting and/or by synaptic inputs. We determined that membrane potential is responsible for most, if not all, of the cytoplasmic Ca(2+) signal recorded during rhythmic bursting in two neurons of the escape swim central pattern generator (CPG) of the mollusk, Tritonia diomedea: ventral swim interneuron B (VSI) and cerebral neuron 2 (C2). Ca(2+) signals were imaged with a confocal laser scanning microscope while the membrane potential was recorded at the soma. During the swim motor pattern (SMP), Ca(2+) signals in both neurons transiently increased during each burst of action potentials with a more rapid decay in secondary than in primary neurites. VSI and C2 were then voltage-clamped at the soma, and each neuron's own membrane potential waveform recorded during the SMP was played back as the voltage command. In all regions of VSI, this completely reproduced the amplitude and time course of Ca(2+) signals observed during the SMP, but in C2, the amplitude was lower in the playback experiments than during the SMP, possibly due to space clamp problems. Therefore in VSI, the cytoplasmic Ca(2+) signal during the SMP can be accounted for by its membrane potential excursions, whereas in C2 the membrane potential excursions can account for most of the SMP Ca(2+) signal.

Role of membrane potential in calcium signaling during rhythmic bursting in tritonia swim interneurons. Publishing Authors By Initials

ES Hill,PS Katz,

For similar musculoskeletal, neural, and ocular physiology: musculoskeletal physiology: musculoskeletal physiologic processes: movement: locomotion: swimming research abstracts see: musculoskeletal, neural, and ocular physiology: musculoskeletal physiology: musculoskeletal physiologic processes: movement: locomotion: swimming research

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Role of membrane potential in calcium signaling during rhythmic bursting in tritonia swim interneurons. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Journal of neurophysiology

VOLUME: 97

Page Numbers: 2204-14

Journal Abbreviation: J. Neurophysiol.

ISSN: 0022-3077

DAY: 17

MONTH: 01

YEAR: 2007

Role of membrane potential in calcium signaling during rhythmic bursting in tritonia swim interneurons. Information

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LANGUAGE: eng

NlmUniqueID: 375404

Role of membrane potential in calcium signaling during rhythmic bursting in tritonia swim interneurons. Keywords Mesh Terms:

KEYWORDS: Swimming

MESH TERMS: methods

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Grant and Affiliation Information for Role of membrane potential in calcium signaling during rhythmic bursting in tritonia swim interneurons.

AFFILIATION: Department of Biology, Georgia State University, PO Box 4010, Atlanta, GA 30302-4010, USA.

Country: United States

AGENCY: United States NINDS

GRANT: NS-35371

ACRONYM: NS

MEDLINETA: J Neurophysiol

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