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).
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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.
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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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DOI: https://doi.org/10.1007/s00011-022-01603-0