Abstract
The oncogene bcl-2 encodes a 26-kD protein localized to intracellular membranes, including the ER, mitochondria, and perinuclear membrane, but its mechanism of action is unknown. We have been investigating the hypothesis that Bcl-2 regulates the movement of calcium ions (Ca2+) through the ER membrane. Earlier findings in this laboratory indicated that Bcl-2 reduces Ca2+ efflux from the ER lumen in WEHI7.2 lymphoma cells treated with the Ca2+-ATPase inhibitor thapsigargin (TG) but does not prevent capacitative entry of extracellular calcium. In this report, we show that sustained elevation of cytosolic Ca2+ due to capacitative entry is not required for induction of apoptosis by TG, suggesting that ER calcium pool depletion may trigger apoptosis. Bcl-2 overexpression maintains Ca2+ uptake in the ER of TG-treated cells and prevents a TG-imposed delay in intralumenal processing of the endogenous glycoprotein cathepsin D. Also, Bcl-2 overexpression preserves the ER Ca2+ pool in untreated cells when extracellular Ca2+ is low. However, low extracellular Ca2+ reduces the antiapoptotic action of Bcl-2, suggesting that cytosolic Ca2+ elevation due to capacitative entry may be required for optimal ER pool filling and apoptosis inhibition by Bcl-2. In summary, the findings suggest that Bcl-2 maintains Ca2+ homeostasis within the ER, thereby inhibiting apoptosis induction by TG.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 12:47 p.m.) |
Deposited | 2 years, 1 month ago (July 22, 2023, 3:07 a.m.) |
Indexed | 1 week ago (Aug. 23, 2025, 12:58 a.m.) |
Issued | 27 years, 11 months ago (Sept. 22, 1997) |
Published | 27 years, 11 months ago (Sept. 22, 1997) |
Published Online | 27 years, 11 months ago (Sept. 22, 1997) |
Published Print | 27 years, 11 months ago (Sept. 22, 1997) |
@article{He_1997, title={Maintenance of Calcium Homeostasis in the Endoplasmic Reticulum by Bcl-2}, volume={138}, ISSN={1540-8140}, url={http://dx.doi.org/10.1083/jcb.138.6.1219}, DOI={10.1083/jcb.138.6.1219}, number={6}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={He, Huiling and Lam, Minh and McCormick, Thomas S. and Distelhorst, Clark W.}, year={1997}, month=sep, pages={1219–1228} }