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Lisak, D; Schacht, T; Gawlitza, A; Albrecht, P; Aktas, O; Koop, B; Gliem, M; Hofstetter, H H; Zanger, K; Bultynck, G; Parys, J B; De Smedt, H; Kindler, T; Adams-Quack, P; Hahn, M; Waisman, A; Reed, J C; Hövelmeyer, N; Methner, A
Cell death and differentiation, 02/2016, Letnik: 23, Številka: 2Journal Article
The endoplasmic reticulum (ER) serves as the major intracellular Ca2+ store and has a role in the synthesis and folding of proteins. BAX (BCL2-associated X protein) inhibitor-1 (BI-1) is a Ca2+ leak channel also implicated in the response against protein misfolding, thereby connecting the Ca2+ store and protein-folding functions of the ER. We found that BI-1-deficient mice suffer from leukopenia and erythrocytosis, have an increased number of splenic marginal zone B cells and higher abundance and nuclear translocation of NF-κB (nuclear factor-κ light-chain enhancer of activated B cells) proteins, correlating with increased cytosolic and ER Ca2+ levels. When put into culture, purified knockout T cells and even more so B cells die spontaneously. This is preceded by increased activity of the mitochondrial initiator caspase-9 and correlated with a significant surge in mitochondrial Ca2+ levels, suggesting an exhausted mitochondrial Ca2+ buffer capacity as the underlying cause for cell death in vitro. In vivo, T-cell-dependent experimental autoimmune encephalomyelitis and B-cell-dependent antibody production are attenuated, corroborating the ex vivo results. These results suggest that BI-1 has a major role in the functioning of the adaptive immune system by regulating intracellular Ca2+ homeostasis in lymphocytes.
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