Abstract
Oxidative stress is one of most common environmental stresses encountered by fish, especially during their fragile larval stage. More and more studies are aimed at understanding the antioxidant defense mechanism of fish larvae. Herein we characterized the early resistance of zebrafish larvae to oxidative stress and investigated the underlying transcriptional regulations using RNA-seq. We found that pre-exposure of zebrafish larvae to 2 mM H2O2 for 1 or 3 h significantly improved their survival under higher doses of H2O2 (3 mM), suggesting the antioxidant defenses of zebrafish larvae were rapidly built under pre-exposure of H2O2. Comparative transcriptome analysis showed that 310 (185 up and 125 down) and 512 (331 up and 181 down) differentially expressed genes were generated after 1 and 3 h of pre-exposure, respectively. KEGG enrichment analysis revealed that protein processing in endoplasmic reticulum is a highly enriched pathway; multiple genes (e.g., hsp70.1, hsp70.2, and hsp90aa1.2) encoding heat shock proteins in this pathway were sharply upregulated presumably to correct protein misfolding and maintaining the cellular normal functions during oxidative stress. More importantly, the Keap1/Nrf2 system-mediated detoxification enzyme system was significantly activated, which regulates the upregulation of target genes (e.g., gstp1, gsr, and prdx1) to scavenger reactive oxygen species, thereby defending against apoptosis. In addition, the MAPK, as a transmitter of stress signals, was activated, which may play an important role in activating antioxidant system in the early stages of oxidative stress. Altogether, these findings demonstrate that zebrafish larvae rapidly establish resistance to oxidative stress, and this involves changes in protein processing, stress signal transmission, and the activation of detoxification pathways.
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The research was supported by the Fundamental Research Funds for the Central Universities (NO. SWU-KQ22015).
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Conceptualization, H.X. and Y.L.; methodology, H.X. and X.-M.M.; software, H.X.; validation, H.X. and X.-M.M.; formal analysis, H.X., X.-M.M., and W.-B.W.; investigation, H.X., X.-M.M., and G.W.; resources, Y.L.; data curation, H.X. and X.-M.M.; writing—original draft preparation, H.X.; writing—review and editing, H.X. and Y.L.; visualization, H.X. and W.-B.W.; supervision, Y.L.; project administration, H.X.; funding acquisition, Y.L. All authors have read and agreed to the published version of the manuscript.
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Xu, H., Miao, XM., Wang, WB. et al. Transcriptome analysis reveals the early resistance of zebrafish larvae to oxidative stress. Fish Physiol Biochem 48, 1075–1089 (2022). https://doi.org/10.1007/s10695-022-01100-5
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DOI: https://doi.org/10.1007/s10695-022-01100-5