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Caffeine alleviates acute liver injury by inducing the expression of NEDD4L and deceasing GRP78 level via ubiquitination

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Abstract

Background

Acute liver injury is liver cell injury that occurs rapidly in a short period of time. Caffeine has been shown to maintain hepatoprotective effect with an unclear mechanism. Endoplasmic reticulum stress (ERS) has significant effects in acute liver injury. Induction of GRP78 is a hallmark of ERS. Whether or not caffeine’s function is related to GRP78 remains to be explored.

Methods

Acute liver injury model was established by LPS-treated L02 cells and in vivo administration of LPS/D-Gal in mice. Caffeine was pre-treated in L02 cells or mice. Gene levels was determined by real-time PCR and western blot. Cell viability was tested by CCK-8 assay and cell apoptosis was tested by flow cytometry. The interaction of GRP78 and NEDD4L was determined by Pull-down and co-immunoprecipitation (Co-IP) assay. The ubiquitination by NEDD4L on GRP78 was validated by in vitro ubiquitination assay.

Results

Caffeine protected liver cells against acute injury induced cell apoptosis and ERS both in vitro and in vivo. Suppression of GRP78 could block the LPS-induced cell apoptosis and ERS. NEDD4L was found to interact with GRP78 and ubiquitinate its lysine of 324 site directly. Caffeine treatment induced the expression of NEDD4L, resulting in the ubiquitination and inhibition of GRP78.

Conclusion

Caffeine mitigated the acute liver injury by stimulating NEDD4L expression, which inhibited GRP78 expression via ubiquitination at its K324 site. Low dose of caffeine could be a promising therapeutic treatment for acute liver injury.

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Data availability

All data generated or analyzed during this study are included in this article. The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

ER:

Endoplasmic reticulum

ERS:

Endoplasmic reticulum stress

GRP78:

Glucose-regulated protein 78

PERK:

Protein kinase R-like ER kinase

IRE-1α:

Inositol-requiring enzyme 1 alpha

ATF6:

Activating transcription factor 6

ATF4:

Activating transcription factor 6

CHOP:

C/EBP homologous protein

CAFF:

Caffeine

H and E:

Hematoxylin–eosin

FBS:

Fetal bovine serum

qRT-PCR:

Quantitative real-time PCR

CCK8:

Cell counting kit-8

LPS:

Lipopolysaccharide

D-gal:

D-galactosamine

Co-IP:

Co-immunoprecipitation

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Acknowledgements

We would like to give our sincere gratitude to the reviewers for their constructive comments.

Funding

This work was supported by grant from National Natural Sciences Foundation of China (No.81970523), and Natural Sciences Foundation of Hunan province (2020JJ4877).

Author information

Authors and Affiliations

Authors

Contributions

XWH: conceptualization, writing–original draft, and methodology; XML: formal analysis; AMW: supervision; YMF: validation; FJZ: data curation; FZ: resources; LPC: investigation; HL: software; YHX: visualization; JX: project administration; JL: funding acquisition, writing–review and editing. All authors have read and approved the final version of this manuscript to be published.

Corresponding author

Correspondence to Jia Li.

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The authors declare no competing interests.

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Not applicable. This article does not contain any studies with human participants or animals performed by any of the authors.

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Not applicable. This article does not contain any studies with human participants performed by any of the authors.

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Responsible Editor: John Di Battista.

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Supplementary Information

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11_2022_1603_MOESM1_ESM.tif

Supplementary file1 NEDD4L inhibited liver cell apoptosis via regulating GRP78. A mRNA and B protein levels of NEDD4L and GRP78 in L02 cells. C Flow cytometry and statistic result for apoptosis detection of L02 cells. *P < 0.05, **P < 0.01, ***P < 0.001, one-way ANOVA followed by Tukey’s multiple comparison test, N = 3. (TIF 1122 KB)

11_2022_1603_MOESM2_ESM.tif

Supplementary file2 The effect of caffeine treatment on LPS level. Relative level of LPS in the culture medium of L02 cells after treated with or without caffeine (TIF 100 KB)

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Hu, XW., Li, XM., Wang, AM. et al. Caffeine alleviates acute liver injury by inducing the expression of NEDD4L and deceasing GRP78 level via ubiquitination. Inflamm. Res. 71, 1213–1227 (2022). https://doi.org/10.1007/s00011-022-01603-0

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