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The role of selenoprotein M in nickel-induced pyroptosis in mice spleen tissue via oxidative stress

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Abstract

Nickel (Ni) is a heavy metal element and a pollutant that threatens the organism’s health. Melatonin (Mel) is an antioxidant substance that can be secreted by the organism and has a protective effect against heavy metals. Selenoprotein M (SelM) is a selenoprotein widely distributed of the body, and its role is to protect these tissues from oxidative damage. To study the mechanism of Ni, Mel, and SelM in mouse spleen, 80 SelM+/+ wild-type and 80 SelM−/− homozygous mice were divided into 8 groups with 20 mice in each group. The Ni group was intragastric at a concentration of 10 mg/kg, while the Mel group was intragastric at 2 mg/kg. Mice were injected with 0.1 mL/10 g body weight for 21 days. Histopathological and ultrastructural observations showed the changes in Ni, such as the destruction of white and red pulp and the appearance of pyroptosomes. SelM knockout showed more severe injury, while Mel could effectively interfere with Ni-induced spleen toxicity. The results of antioxidant capacity determination showed that Ni could cause oxidative stress in the spleen, and Mel could also effectively reduce oxidative stress. Finally, Ni exposure increased the expression levels of the pyroptotic genes, including apoptosis-associated speck protein (ASC), absent in melanoma-2 (AIM2), NOD-like receptor thermal protein domain-associated protein 3 (NLRP3), Caspase-1, interleukin- (IL-) 18, and IL-1β (p < 0.05). Loss of SelM significantly increased these (p < 0.05), while Mel decreased the alleviated impact of Ni. In conclusion, the loss of SelM aggravated Ni-induced pyroptosis of the spleen via activating oxidative stress, which was alleviated by Mel, but the effect of Mel was not obvious in the absence of SelM, which reflected the important role of SelM in Ni-induced pyroptosis.

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Data availability

All data generated or analyzed during this study are included in this published article.

Abbreviations

Ni:

Nickel

Mel:

Melatonin

SelM:

Selenoprotein M

H&E:

Hematoxylin-eosin

SOD:

Superoxide dismutase

T-AOC:

Total antioxidant capacity

MDA:

Malondialdehyde

GSSG:

Oxidized glutathione disulfide

GSH:

Reduced glutathione

qRT-PCR:

Quantitative real-time polymerase chain reaction

PMSF:

Phenylmethylsulfonyl fluoride

BCA:

Bicinchoninic acid

NC:

Nitrocellulose

BSA:

Bovine serum albumin

LY:

Lymphocytes

SP:

Spleen cord

SS:

Spleen sinus

WP:

White pulp

RP:

Red pulp

RSC:

Red blood cells

ASC:

Apoptosis-associated speck protein

AIM2:

Absent in melanoma-2

NOX2:

Nicotinamide adenine dinucleotide phosphate oxidase 2

NLRP3:

NOD-like receptor thermal protein domain-associated protein 3

TXNIP:

Thioredoxin-interacting protein

TRXI:

Time-resolved x-ray imager

IL-18:

Interleukin- (IL-) 18

PRRs:

Pattern recognition receptors

GSDMD:

gasdermin D

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Funding

This work was supported by the National Natural Science Foundation of China (31872531) and Excellent Youth Foundation of Heilongjiang Province of China (YQ2021C021).

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Authors and Affiliations

Authors

Contributions

Wenxue Ma: conceptualization, methodology, software, investigation, and writing—original draft. Yue Liu: formal analysis. Lihua Xu: visualization. **aoxue Gai: validation. Yue Sun: formal analysis. Senqiu Qiao: software. Pinnan Liu: supervision. Qiaohan Liu: data curation. Ziwei Zhang: writing—review and editing.

Corresponding author

Correspondence to Ziwei Zhang.

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All the procedures were approved by the Academic Committee of Northeast Agricultural University. They informed and agreed. The approval number is NEAUEC2021 03 22.

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All authors have read the manuscript and agreed to submit it in its current form for consideration for publication in the journal.

Competing interests

The authors declare no competing interests.

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Responsible Editor: Mohamed M. Abdel-Daim

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Ma, W., Liu, Y., Xu, L. et al. The role of selenoprotein M in nickel-induced pyroptosis in mice spleen tissue via oxidative stress. Environ Sci Pollut Res 30, 34270–34281 (2023). https://doi.org/10.1007/s11356-022-24597-y

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  • DOI: https://doi.org/10.1007/s11356-022-24597-y

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