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Hyperthermia induced by heat stress (HS) is known to inhibit proliferation and induce cell death in cancer. We previously demonstrated that checkpoint kinase 1 (Chk1) contributes to G2/M arrest and cell survival under HS; however, the role of Chk2, a functional analog of Chk1, in regulation of the cell cycle and cell death under HS is still unknown. Here, we addressed the role of Chk2 using Molt-4...
Hyperthermia induced by heat stress (HS) inhibits the proliferation of cancer cells and induces their apoptosis. However, the mechanism underlying HS-induced apoptosis remains elusive. Here, we demonstrated a novel evidence that checkpoint kinase 1 (Chk1) plays crucial roles in the apoptosis and regulation of cell cycle progression in cells under HS. In human leukemia Jurkat cells, interestingly,...
We have shown that heat stress or a superoxide dismutase mimic nitroxide, Tempo, induces apoptosis, while their combination causes nonapoptotic cell death; however, the underlying mechanism for this switch remains unclear. Here we identified for the first time that 10 mM Tempo present during heating at 44°C for 30 min rapidly induced autophagy in U937 leukemic cells in spite of Bax activation and...
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