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Animal steroid hormones stimulate extracellular Ca2+ influx into cells; however, the mechanism remains unclear. In this study, we determined that the Ca2+ influx induced by steroid hormone 20-hydroxyecdysone (20E) is mediated by the calcium release-activated calcium channel modulator 1 (CRACM1/Orai1). The Orai1 mRNA is highly expressed during midgut programmed cell death in the lepidopteran insect...
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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