Sub-cellular Ca2+ dynamics affected by voltage- and Ca2+-gated K+ channels: Regulation of the soma-growth cone disparity and the quiescent state in Drosophila neurons.

Sub-cellular Ca2+ dynamics affected by voltage- and Ca2+-gated K+ channels: Regulation of the soma-growth cone disparity and the quiescent state in Drosophila neurons. Research Abstract Details 

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Sub-cellular Ca2+ dynamics affected by voltage- and Ca2+-gated K+ channels: Regulation of the soma-growth cone disparity and the quiescent state in Drosophila neurons. Abstract Text:

B A Berke,J Lee,I-F Peng,C-F Wu,

Using Drosophila mutants and pharmacological blockers, we provide the first evidence that distinct types of K(+) channels differentially influence sub-cellular Ca(2+) regulation and growth cone morphology during neuronal development. Fura-2-based imaging revealed in cultured embryonic neurons that the loss of either voltage-gated, inactivating Shaker channels or Ca(2+)-gated Slowpoke BK channels led to robust spontaneous Ca(2+) transients that preferentially occurred within the growth cone. In contrast, loss of voltage-gated, non-inactivating Shab channels did not show such a disparity and sometimes produced soma-specific Ca(2+) transients. The fast spontaneous transients in both the soma and growth cone were suppressed by the Na(+) channel blocker tetrodotoxin, indicating that these Ca(2+) fluctuations stemmed from increases in membrane excitability. Similar differences in regional Ca(2+) regulation were observed upon membrane depolarization by high K(+)-containing saline. In particular, Shaker and slowpoke mutations enhanced the size and dynamics of the depolarization-induced Ca(2+) increase in the growth cone. In contrast, Shab mutations greatly prolonged the Ca(2+) increase in the soma. Differential effects of these excitability mutations on neuronal development were indicated by their distinct alterations in growth cone morphology. Loss of Shaker currents increased the size of lamellipodia and the number of filopodia, structures associated with the actin cytoskeleton. Interestingly, loss of Slowpoke currents strongly influenced tubulin regulation, enhancing the number of microtubule loop structures per growth cone. Together, our findings support the idea that individual K(+) channel subunits differentially regulate spontaneous sub-cellular Ca(2+) fluctuations in growing neurons that may influence activity-dependent growth cone formation.

Sub-cellular Ca2+ dynamics affected by voltage- and Ca2+-gated K+ channels: Regulation of the soma-growth cone disparity and the quiescent state in Drosophila neurons. Publishing Authors By Initials

BA Berke,J Lee,IF Peng,CF Wu,

For similar heterocyclic compounds: heterocyclic compounds, 2-ring: quinazolines: tetrodotoxin research abstracts see: heterocyclic compounds: heterocyclic compounds, 2-ring: quinazolines: tetrodotoxin research

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Sub-cellular Ca2+ dynamics affected by voltage- and Ca2+-gated K+ channels: Regulation of the soma-growth cone disparity and the quiescent state in Drosophila neurons. Journal Published:

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

Journal: Neuroscience

VOLUME: 142

Page Numbers: 629-44

Journal Abbreviation: Neuroscience

ISSN: 0306-4522

DAY: 17

MONTH: 08

YEAR: 2006

Sub-cellular Ca2+ dynamics affected by voltage- and Ca2+-gated K+ channels: Regulation of the soma-growth cone disparity and the quiescent state in Drosophila neurons. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 7605074

Sub-cellular Ca2+ dynamics affected by voltage- and Ca2+-gated K+ channels: Regulation of the soma-growth cone disparity and the quiescent state in Drosophila neurons. Keywords Mesh Terms:

KEYWORDS: Tetrodotoxin

MESH TERMS: pharmacology

Chemical & Substance for Abstract: Sub-cellular Ca2+ dynamics affected by voltage- and Ca2+-gated K+ channels: Regulation of the soma-growth cone disparity and the quiescent state in Drosophila neurons. Information

Substance Name: Calcium

Registry Number: 7440-70-2

Grant and Affiliation Information for Sub-cellular Ca2+ dynamics affected by voltage- and Ca2+-gated K+ channels: Regulation of the soma-growth cone disparity and the quiescent state in Drosophila neurons.

AFFILIATION: Interdisciplinary Program in Neuroscience, University of Iowa, Iowa City, IA 52242, USA. brett.berke@yale.edu

Country: United States

AGENCY: United States NINDS

GRANT: NS 26528

ACRONYM: NS

MEDLINETA: Neuroscience

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