TY - JOUR
T1 - The transforming growth factor β1-inducible transcription factor, TIEG1, mediates apoptosis through oxidative stress
AU - Ribeiro, Afonso
AU - Bronk, Steven E.
AU - Roberts, Patricia J.
AU - Urrutia, Raul
AU - Gores, Gregory J.
PY - 1999
Y1 - 1999
N2 - Transforming growth factor β1 (TGF-β1)-inducible transcription factors have recently elicited interest because of their critical role in the regulation of cell proliferation, differentiation, and apoptosis. We have previously reported that the TGF-β1-inducible transcription factor, TIEG1, induces apoptosis in a pancreas-derived cell line. However, the mechanisms underlying the apoptotic effects of this transcription factor remain to be defined. In this study, using the TGF-β1-sensitive Hep 3B cell line, we have defined the mechanistic sequence of events that characterize TIEG1- mediated apoptosis and compared these events with the changes observed during TGF-β1-induced apoptosis. Both TGF-β1- and TIEG1-induced cell death were accompanied by an increase in the generation of reactive oxygen species and a loss of the mitochondrial membrane potential preceding the morphological changes of apoptosis. In contrast, increases in caspase 3-like activity and glutathione (GSH) depletion occurred later in the apoptotic process, concurrent with the morphological features of apoptosis. The antioxidant, trolox, decreased the formation of reactive oxygen species and apoptosis. These results demonstrate that similar to TGF-β1, TIEG1 induces apoptosis by a mechanism involving the formation of reactive oxygen species.
AB - Transforming growth factor β1 (TGF-β1)-inducible transcription factors have recently elicited interest because of their critical role in the regulation of cell proliferation, differentiation, and apoptosis. We have previously reported that the TGF-β1-inducible transcription factor, TIEG1, induces apoptosis in a pancreas-derived cell line. However, the mechanisms underlying the apoptotic effects of this transcription factor remain to be defined. In this study, using the TGF-β1-sensitive Hep 3B cell line, we have defined the mechanistic sequence of events that characterize TIEG1- mediated apoptosis and compared these events with the changes observed during TGF-β1-induced apoptosis. Both TGF-β1- and TIEG1-induced cell death were accompanied by an increase in the generation of reactive oxygen species and a loss of the mitochondrial membrane potential preceding the morphological changes of apoptosis. In contrast, increases in caspase 3-like activity and glutathione (GSH) depletion occurred later in the apoptotic process, concurrent with the morphological features of apoptosis. The antioxidant, trolox, decreased the formation of reactive oxygen species and apoptosis. These results demonstrate that similar to TGF-β1, TIEG1 induces apoptosis by a mechanism involving the formation of reactive oxygen species.
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U2 - 10.1002/hep.510300620
DO - 10.1002/hep.510300620
M3 - Article
C2 - 10573529
AN - SCOPUS:0032696730
SN - 0270-9139
VL - 30
SP - 1490
EP - 1497
JO - Hepatology
JF - Hepatology
IS - 6
ER -