Author/Authors :
Abeele، نويسنده , , Fabien Vanden and Skryma، نويسنده , , Roman and Shuba، نويسنده , , Yaroslav and Van Coppenolle، نويسنده , , Fabien and Slomianny، نويسنده , , Christian and Roudbaraki، نويسنده , , Morad and Mauroy، نويسنده , , Brigitte and Wuytack، نويسنده , , Frank and Prevarskaya، نويسنده , , Natalia، نويسنده ,
Abstract :
Antiapoptotic oncoprotein Bcl-2 has extramitochondrial actions due to its localization on the endoplasmic reticulum (ER); however, the specific mechanisms of such actions remain unclear. Here we show that Bcl-2 overexpression in LNCaP prostate cancer epithelial cells results in downregulation of store-operated Ca2+ current by decreasing the number of functional channels and inhibiting ER Ca2+ uptake through a reduction in the expression of calreticulin and SERCA2b, two key proteins controlling ER Ca2+ content. Furthermore, we demonstrate that Ca2+ store depletion by itself is not sufficient to induce apoptosis in Bcl-2 overexpressing cells, and that sustained Ca2+ entry via activated store-operated channels (SOCs) is required as well. Our data therefore suggest the pivotal role of SOCs in apoptosis and cancer progression.
