Abstract
Tumour necrosis factor-α (TNF) receptors mediate a variety of effects dependent on cell type. A role for Ca2+ in TNF-induced death remains uncertain. Here we investigated restricting intracellular/extracellular Ca2+ in HeLa epithelial carcinoma cells expressing low and high levels of p75TNFR receptor subtype and KYM-1 rhabdomyosarcoma cells, models of rapid TNF-induced apoptosis. Ca2+-chelators EGTA and BAPTA-AM as well as microsomal Ca2+-ATPase inhibitor thapsigargin, did not alter TNF-induced death. TNF was also unable to alter resting [Ca2+]i levels which remained < 200 nM even during times when these cells were undergoing apoptotic cell death. These findings indicate no role for modulated Ca2+ concentrations in TNF-induced apoptotic cell death.
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McFarlane, S.M., Anderson, H.M., Tucker, S.J. et al. Unmodified calcium concentrations in tumour necrosis factor receptor subtype-mediated apoptotic cell death. Mol Cell Biochem 211, 19–26 (2000). https://doi.org/10.1023/A:1007189911897
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DOI: https://doi.org/10.1023/A:1007189911897