Using fluorescently tagged markers for organelles in conjunction with confocal microscopy, we have studied the effects of agonist-induced Ca2+ signals on the motility of mitochondria and the ER (endoplasmic reticulum). We observed that the muscarinic agonist carbachol produced a rapid, simultaneous and reversible cessation of the movements of both organelles, which was dependent on a rise in cytosolic Ca2+. This rise in Ca2+ was shown to cause a fall in cellular ATP levels, and the effect of carbachol on organelle movement could be mimicked by depleting ATP with metabolic inhibitors in the absence of any such rise in Ca2+. However, a Ca2+-sensing process independent of ATP appears also to be involved, because we identified conditions where the ATP depletion was blocked (by inhibitors of the Ca2+ pumps), but the organelle movements still ceased following a rise in cytosolic Ca2+. We conclude that the co-ordinated cessation of mitochondria and ER motility is a process regulated by the cytosolic concentration of both Ca2+ and ATP, and that these two parameters are likely to synergize to regulate the localization of the two organelles, and to facilitate the transfer of Ca2+ between them.
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Research Article|
November 22 2005
Agonist-induced regulation of mitochondrial and endoplasmic reticulum motility
David Brough;
David Brough
1Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge CB2 1PD, U.K.
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Michael J. Schell;
Michael J. Schell
1Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge CB2 1PD, U.K.
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Robin F. Irvine
Robin F. Irvine
1
1Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge CB2 1PD, U.K.
1To whom correspondence should be addressed (email rfi20@cam.ac.uk).
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Publisher: Portland Press Ltd
Received:
May 04 2005
Revision Received:
June 17 2005
Accepted:
June 28 2005
Accepted Manuscript online:
June 28 2005
Online ISSN: 1470-8728
Print ISSN: 0264-6021
The Biochemical Society, London
2005
Biochem J (2005) 392 (2): 291–297.
Article history
Received:
May 04 2005
Revision Received:
June 17 2005
Accepted:
June 28 2005
Accepted Manuscript online:
June 28 2005
Citation
David Brough, Michael J. Schell, Robin F. Irvine; Agonist-induced regulation of mitochondrial and endoplasmic reticulum motility. Biochem J 1 December 2005; 392 (2): 291–297. doi: https://doi.org/10.1042/BJ20050738
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