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Comparison of ionic currents expressed in immature and mature muscle cells of an ascidian larva

AK Davis, AA Greaves, JE Dallman and WJ Moody
Journal of Neuroscience 1 July 1995, 15 (7) 4875-4884; https://doi.org/10.1523/JNEUROSCI.15-07-04875.1995
AK Davis
Department of Zoology, University of Washington, Seattle 98195, USA.
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AA Greaves
Department of Zoology, University of Washington, Seattle 98195, USA.
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JE Dallman
Department of Zoology, University of Washington, Seattle 98195, USA.
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WJ Moody
Department of Zoology, University of Washington, Seattle 98195, USA.
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Abstract

We have compared the voltage-gated ion channels present in larval ascidian muscle at two developmental stages: muscle precursor cells just after the terminal cell division and mature contractile muscle, 7- 11 hr later. All precursor cells express a high-threshold transient Ca current and a slowly activating delayed K current, and about half the cells express a low-threshold transient Ca current. An inwardly rectifying K current, which had been present from fertilization until just before the terminal cell division, is absent. Mature muscle retains two of the tailbud currents: the low-threshold transient Ca current and the slow delayed K current, although at larger densities, and also expresses a high-threshold Ca current that is similar in most respects to the precursor cell current but that lacks inactivation. In addition, mature muscle expresses two rapidly activating outward K currents, one voltage and one Ca dependent, that generate a composite outward K current that is eight times larger and activates eight times faster than the tailbud K current. Mature muscle also reexpresses the inward rectifier. We propose that the transient absence of the inward rectifier and the slow activation of the delayed K current early in development create a window of developmental time when spontaneous electrical activity is likely.

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The Journal of Neuroscience: 15 (7)
Journal of Neuroscience
Vol. 15, Issue 7
1 Jul 1995
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Comparison of ionic currents expressed in immature and mature muscle cells of an ascidian larva
AK Davis, AA Greaves, JE Dallman, WJ Moody
Journal of Neuroscience 1 July 1995, 15 (7) 4875-4884; DOI: 10.1523/JNEUROSCI.15-07-04875.1995

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Comparison of ionic currents expressed in immature and mature muscle cells of an ascidian larva
AK Davis, AA Greaves, JE Dallman, WJ Moody
Journal of Neuroscience 1 July 1995, 15 (7) 4875-4884; DOI: 10.1523/JNEUROSCI.15-07-04875.1995
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