NDLI: Raising the intracellular level of inositol 1,4,5-trisphosphate changes plasma membrane ion transport in characean algae.

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Raising the intracellular level of inositol 1,4,5-trisphosphate changes plasma membrane ion transport in characean algae.

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Raising the intracellular level of inositol 1,4,5-trisphosphate changes plasma membrane ion transport in characean algae.

Content Provider	PubMed Central
Author	Thiel, G. Macrobbie, E. A. Hanke, D. E.
Abstract	Inositol 1,4,5-trisphosphate (InsP3) was introduced into the cytoplasm of characean algae in two different ways: (i) by iontophoretic injection into cytoplasm-enriched fragments from Chara and (ii) by adding InsP3 to the permeabilization medium of locally permeabilized cells of Nitella. In both systems this operation induced a depolarization of the membrane potential, ranging from a few mV to sequences of action potentials. The effect of InsP3 on locally permeabilized Nitella cells was abolished when InsP3 was added together with 30 mM EGTA. When inositol 1,4-bisphosphate or myo-inositol were substituted for InsP3 in this system, there was no change in the membrane potential. On the other hand, increasing the free Ca2+ concentration in the permeabilization medium induced, in a similar fashion to InsP3, action potentials. Similarities between InsP3 and Ca2+ action were also observed upon injection into Chara fragments. Both injections increased an inward current. In the first few seconds after injection the current/voltage characteristics of the InsP3-induced current resembled those of the Ca2(+)-sensitive current. Subsequently, differences between the InsP3- and Ca2(+)-induced phenomena became apparent in that the InsP3-induced current continued to increase while the Ca2(+)-induced current declined, returning to the resting level. Our results suggest that these plant cells contain an InsP3 sensitive system that, under experimental conditions, is able to affect membrane transport via an increase in cytoplasmic free Ca2+.
Starting Page	1737
File Format	PDF
ISSN	14602075
e-ISSN	14602075
Journal	The EMBO Journal
Issue Number	6
Volume Number	9
Language	English
Publisher Date	1990-06-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Neuroscience Immunology and Microbiology Medicine Molecular Biology

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Identification of Functionally Critical Residues in the Channel Domain of Inositol Trisphosphate Receptors

Fragmented Inositol 1,4,5-Trisphosphate Receptors Retain Tetrameric Architecture and Form Functional Ca2+ Release Channels

Stereospecific mobilization of intracellular Ca2+ by inositol 1,4,5-triphosphate. Comparison with inositol 1,4,5-trisphosphorothioate and inositol 1,3,4-trisphosphate.

Isoform-specific Regulation of the Inositol 1,4,5-Trisphosphate Receptor by O-Linked Glycosylation

A function for tyrosine phosphorylation of type 1 inositol 1,4,5-trisphosphate receptor in lymphocyte activation

Three-dimensional structure of the type 1 inositol 1,4,5-trisphosphate receptor at 24 Å resolution

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Inositol 1,4,5-trisphosphorothioate, a stable analogue of inositol trisphosphate which mobilizes intracellular calcium.

Raising the intracellular level of inositol 1,4,5-trisphosphate changes plasma membrane ion transport in characean algae.

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