J. Cell Biol.
© The Rockefeller University Press
0021-9525/97/09/1219/10 $2.00
Volume 138, Number 6, September 22, 1997 1219-1228

Maintenance of Calcium Homeostasis in the Endoplasmic Reticulum by Bcl-2

Huiling He, Minh Lam, Thomas S. McCormick, and Clark W. Distelhorst

Departments of Medicine and Pharmacology, Case Western Reserve University, Cleveland, Ohio 44106

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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