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• W4386003417 abstract "The development of the follicle is accompanied by steroidogenesis and secretion, the endoplasmic reticulum (ER) requires significant synthesis of relevant proteins to support changes in the follicular microenvironment. The aim of this study was to investigate whether seasonal changes in gonadotropins and ovarian steroid hormones in the wild ground squirrels induce endoplasmic reticulum stress (ERS) and changes in ERS-mediated unfolded protein response (UPR) signaling. There were significant seasonal differences in ovarian mass, with values higher in the breeding season and relatively low in the non-breeding season. Histological observations revealed that ovaries in the breeding season had germ cells including primordial follicles, primary follicles, secondary follicles, tertiary follicles, and the corpus luteal, whereas ovaries consisted mainly of primary and secondary follicles in the non-breeding season. Analysis of ovarian transcriptome data showed that 1298 genes were up-regulated in expression and 1432 genes were down-regulated in expression during both periods. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis indicated that these genes were mainly enriched in estrogen signaling pathways, ovarian steroidogenesis and endoplasmic reticulum protein processing pathways. The expression levels of steroidogenic enzymes (P450scc, P450c17, 3β-HSD, and P450arom) and gonadotropin receptor (FSHR and LHR) were significantly increased during the breeding season compared to the non-breeding season. GRP78 and UPR signaling factors (ATF4, ATF6, XBP1s) associated with ERS were expressed in both seasons. The mRNA expressions of Atf6 and Xbp1s were higher in the breeding season than those of the non-breeding season. Conversely, Atf4 and its downstream homologous protein (Chop) exhibited higher expression during the non-breeding season. In addition, follicle stimulating hormone (FSH), luteinizing hormone (LH), estradiol-17β, and progesterone of serum were significantly higher in the breeding season than those of the non-breeding season. These results suggested that UPR signaling, associated with seasonal changes in ovarian steroidogenesis, was activated during the breeding season and that ERS might be involved in regulating seasonal changes in ovarian steroidogenesis in the wild ground squirrels." @default.
• W4386003417 created "2023-08-20" @default.
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• W4386003417 date "2023-11-01" @default.
• W4386003417 modified "2023-10-12" @default.
• W4386003417 title "Seasonal changes in endoplasmic reticulum stress and steroidogenesis in the ovary of the wild ground squirrels (Citellus dauricus Brandt)" @default.
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• W4386003417 doi "https://doi.org/10.1016/j.ygcen.2023.114368" @default.
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