I decided to look this up...
Here is one article so far:
Quote:
Performing your original search, calcium function in mitochondria, in PubMed will retrieve 12219 records.
FEBS Lett. 2004 Jun 1;567(1):96-102.
Calcium and mitochondria.
Gunter TE, Yule DI, Gunter KK, Eliseev RA, Salter JD.
Source
Department of Biochemistry and Biophysics, School of Medicine and Dentistry, University of Rochester, 575 Elmwood Avenue, Rochester, NY 14642, USA. thomas_gunter@urmc.rochester.edu
Abstract
The literature suggests that the physiological functions for which mitochondria sequester Ca(2+) are (1). to stimulate and control the rate of oxidative phosphorylation, (2). to induce the mitochondrial permeability transition (MPT) and perhaps apoptotic cell death, and (3). to modify the shape of cytosolic Ca(2+) pulses or transients. There is strong evidence that intramitochondrial Ca(2+) controls both the rate of ATP production by oxidative phosphorylation and induction of the MPT. Since the results of these processes are so divergent, the signals inducing them must not be ambiguous. Furthermore, as pointed out by Balaban [J. Mol. Cell. Cardiol. 34 (2002 ) 11259-11271], for any repetitive physiological process dependent on intramitochondrial free Ca(2+) concentration ([Ca(2+)](m)), a kind of intramitochondrial homeostasis must exist so that Ca(2+) influx during the pulse is matched by Ca(2+) efflux during the period between pulses to avoid either Ca(2+) buildup or depletion. In addition, mitochondrial Ca(2+) transport modifies both spatial and temporal aspects of cytosolic Ca(2+) signaling. Here, we look at the amounts of Ca(2+) necessary to mediate the functions of mitochondrial Ca(2+) transport and at the mechanisms of transport themselves in order to set up a hypothesis about how the mechanisms carry out their roles. The emphasis here is on isolated mitochondria and on general mitochondrial properties in order to focus on how mitochondria alone may function to fulfill their physiological roles even though the interactions of mitochondria with other organelles, particularly with endoplasmic and sarcoplasmic reticulum [Sci. STKE re1 (2004) 1-9], may also influence this story.
PMID:
15165900
[PubMed - indexed for MEDLINE]
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This link goes into detail about calcium in the mitochondria:
http://en.wikipedia.org/wiki/Mitochondrion
It is really complicated!
This article explains what happens in cold exposed rats, who are magnesium deficient... We don't know if it applies to humans though from this paper alone:
http://www.mgwater.com/dur08.shtml
This link is also a very good overview about magnesium:
http://en.wikipedia.org/wiki/Magnesium_in_biology
This is turning into a great discussion!
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