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Autophagy regulates cell survival (or cell death in several cases), whereas apoptosis regulates cell death. However, the relationship between autophagy and apoptosis and the regulative mechanism is unclear. We report that steroid hormone 20-hydroxyecdysone (20E) promotes switching from autophagy to apoptosis by increasing intracellular calcium levels in the midgut of the lepidopteran insect Helicoverpa...
Calcium ions are essential secondary messengers that regulate diverse cellular processes including gene transcription, cell proliferation, and apoptosis. The steroid hormone 20-hydroxyecdysone (20E) promotes programmed cell death during insect metamorphosis, whereas juvenile hormone (JH) counteracts 20E activity to prevent metamorphosis. Both 20E and JH can induce cellular calcium increase; however,...
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