Effects of Elevated Intracellular Magnesium on Cytoskeletal Integrity

Prescott, A. R., Comerford, J. G., Magrath, R., Lamb, N. J. C., Warn, R. M. (March 1988) Effects of Elevated Intracellular Magnesium on Cytoskeletal Integrity. Journal of Cell Science, 89 (3). pp. 321-330. ISSN 0021-9533

URL: http://www.ncbi.nlm.nih.gov/pubmed/3198695


Increasing the intracellular magnesium concentration of PtK2 cells by 1 mM or more resulted in the disassembly of the interphase microtubule array over a period of 5 min after microinjection. This effect was found to be both transient and fully reversible, with the microtubule arrays reforming after futher incubation. These effects were studied using immunofluorescence microscopy of fixed cells, and also in living cells using rhodamine-tubulin or rhodamine-conjugated anti-tubulin antibodies and image intensification and enhancement techniques. Simultaneously and accompanying the disassembly of the microtubule arrays the F-actin stress fibres also disappeared, usually leaving the peripheral and perinuclear F-actin microfilaments intact. In contrast, increasing intracellular magnesium appeared to have no effect on the vimentin-containing intermediate filaments of PtK2 cells. These effects on the cytoskeleton were specific to magnesium and could not be mimicked by either microinjection of injection buffer of equivalent ionic strength or sham injection. Raising the intracellular free calcium to the same extent resulted in the disassembly of the microtubule network, but appeared to have no effect on the F-actin stress fibres.

Item Type: Paper
Subjects: bioinformatics > genomics and proteomics > Mapping and Rendering > Micro Array Data Rendering
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > cytoskeletal proteins
Communities: CSHL labs
Depositing User: Gail Sherman
Date: 1 March 1988
Date Deposited: 26 Sep 2017 19:14
Last Modified: 26 Sep 2017 19:14
Related URLs:
URI: https://repository.cshl.edu/id/eprint/35198

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