Crossref journal-article
Rockefeller University Press
The Journal of Cell Biology (291)
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.

Bibliography

He, H., Lam, M., McCormick, T. S., & Distelhorst, C. W. (1997). Maintenance of Calcium Homeostasis in the Endoplasmic Reticulum by Bcl-2. The Journal of Cell Biology, 138(6), 1219–1228.

Authors 4
  1. Huiling He (first)
  2. Minh Lam (additional)
  3. Thomas S. McCormick (additional)
  4. Clark W. Distelhorst (additional)
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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)
Funders 0

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@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} }