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Departments of * Geriatrics and § Physiology and
Edited by Thomas P. Stossel, Harvard Medical School, Boston MA,
and approved March 3, 2000 (received for review August 18, 1999)
The antiapoptotic protein Bcl-2 localizes not only to
mitochondria but also to the endoplasmic reticulum (ER). However, the function of Bcl-2 at the level of the ER is poorly understood. In this
study, we have investigated the effects of Bcl-2 expression on
Ca2+ storage and release by the ER. The expression of Bcl-2
decreased the amount of Ca2+ that could be released from
intracellular stores, regardless of the mode of store depletion, the
cell type, or the species from which Bcl-2 was derived. Bcl-2 also
decreased cellular Ca2+ store content in the presence of
mitochondrial inhibitors, suggesting that its effects were not mediated
through mitochondrial Ca2+ uptake. Direct measurements with
ER-targeted Ca2+-sensitive fluorescent "cameleon"
proteins revealed that Bcl-2 decreased the free Ca2+
concentration within the lumen of the ER,
[Ca2+]ER. Analysis of the kinetics of
Ca2+ store depletion in response to the
Ca2+-ATPase inhibitor thapsigargin revealed that Bcl-2
increased the permeability of the ER membrane. These results suggest
that Bcl-2 decreases the free Ca2+ concentration within the
ER lumen by increasing the Ca2+ permeability of the ER
membrane. The increased ER Ca2+ permeability conferred by
Bcl-2 would be compatible with an ion channel function of Bcl-2 at the
level of the ER membrane.
Biochemistry
Bcl-2 decreases the free Ca2+ concentration within
the endoplasmic reticulum
,
,
,
,
,
Division of Infectious Diseases, Geneva Medical School,
1211 Geneva 14, Switzerland;
Institute of Biochemistry,
University of Lausanne, 1066 Epalinges, Switzerland; and
¶ Institute of Biochemistry, University of Fribourg, 1700 Fribourg, Switzerland
To who reprint requests should be addressed at:
Division of Infectious Diseases, University Hospital of Geneva, 24, rue
Micheli-du-Crest, 1211 Geneva 14, Switzerland. E-mail:
Reyhaneh.Foyouzi{at}hcuge.ch.
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