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• W4288457656 abstract "Apoptosis is the best-known programmed cell death that maintains tissue homeostasis in eukaryotic cells. The morphological characteristics include nuclear and cytoplasmic contraction and cytoplasmic blebbing, its biochemical hallmarks include caspase protease activity and DNA fragmentation. In rat ovaries, cell death is a normal process that occurs throughout the organism’s life. Granulosa cells, the more abundant cell type forming the ovarian follicles, are eliminated via different routes of cell death. Most granulosa cells are eliminated through apoptotic cell death. In this work, we analyzed the behavior of nuclear components throughout the apoptotic process and determined how they are regionalized and conserved during follicular atresia in rat ovaries. Apoptosis was detected based on caspase-3 activity and DNA fragmentation using the TUNEL technique. We identified the transcription markers H3ac and RNA Pol II, and splicing factor SC35 by immunodetection. The nucleolar components were analyzed via light microscopy and transmission electron microscopy through immunodetection of the proteins nucleolin and nucleophosmin-1. The nuclear ultrastructure was analyzed using standard contrast and preferential ribonucleoprotein contrast. Our results demonstrate that during the progression of apoptosis, chromatin is remodeled to constitute apoptotic bodies; transcription and spliceosome elements are reorganized along with the nucleolar components. Additionally, the splicing and transcription factors are segregated into specific territories inside the apoptotic bodies, suggesting that transcriptional elements are reorganized during the apoptotic process. Our results indicate that apoptotic bodies not only are compacted, and chromatin degraded but all the nuclear components are progressively reorganized during cell elimination; moreover, the transcriptional components are preserved." @default.
• W4288457656 created "2022-07-29" @default.
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• W4288457656 date "2022-09-01" @default.
• W4288457656 modified "2023-10-11" @default.
• W4288457656 title "Transcriptional activity and splicing factors are preserved during physiological apoptosis" @default.
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• W4288457656 doi "https://doi.org/10.1016/j.jsb.2022.107884" @default.
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