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Vitamin D3/VDR inhibits inflammation through NF-κB pathway accompanied by resisting apoptosis and inducing autophagy in abalone Haliotis discus hannai

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Abstract

Vitamin D3 is believed to be a contributing factor to innate immunity. Vitamin D receptor (VDR) has a positive effect on inhibiting nuclear factor κB (NF-κB)-mediated inflammation. The underlying molecular mechanisms remain unclear, particularly in mollusks. Consequently, this study will investigate the process of vitamin D3/VDR regulating NF-κB pathway and further explore their functions on inflammation, autophagy, and apoptosis in abalone Haliotis discus hannai. Results showed that knockdown of VDR by using siRNA and dsRNA of VDR in vitro and in vivo led to more intense response of NF-κB signaling to lipopolysaccharide and higher level of apoptosis and autophagy. In addition, 1,25(OH)2D3 stimulation after VDR silencing could partially alleviate apoptosis and induce autophagy. Overexpression of VDR restricted the K48-polyubiquitin chain-dependent inhibitor of κB (IκB) ubiquitination and apoptosis-associated speck-like protein containing CARD (ASC) oligomerization. Besides, VDR silencing resulted in increase of ASC speck formation. In further mechanistic studies, we showed that VDR can directly bind to IκB and IKK1 in vitro and in vivo. In the feeding trial, H&E staining, TUNEL, and electron microscope results showed that vitamin D3 deficiency (0 IU/kg) could recruit more basophilic cells and increase more TUNEL-positive apoptotic cells and lipid droplets (LDs) than vitamin D3 supplement (1000 IU/kg and 5000 IU/kg). In summary, abalone VDR plays a negative regulator role in NF-κB-mediated inflammation via interacting with IκB and inhibiting ubiquitin-dependent degradation of IκB. Vitamin D3 in combination with VDR is essential to establish a delicate balance between autophagy and apoptosis in response to inflammation.

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The data and material that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

This study was financially supported by the National Key R & D Program of China (2018YFD0900400) and the Earmarked Fund for Modern Agro-industry Technology Research System (CARS-49).

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D.H.: conceptualization, data curation, formal analysis, and original draft.

Y.G., X.L., M.P., J.L.: data curation and formal analysis.

W.Z.: conceptualization, funding acquisition, methodology, supervision, and review and editing.

K.M.: conceptualization and methodology.

Corresponding author

Correspondence to Wenbing Zhang.

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All animal care and handling procedures in the present study were strictly approved by the Animal Care Committee of Ocean University of China.

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The authors declare no competing interests.

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Huang, D., Guo, Y., Li, X. et al. Vitamin D3/VDR inhibits inflammation through NF-κB pathway accompanied by resisting apoptosis and inducing autophagy in abalone Haliotis discus hannai. Cell Biol Toxicol 39, 885–906 (2023). https://doi.org/10.1007/s10565-021-09647-4

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  • DOI: https://doi.org/10.1007/s10565-021-09647-4

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