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In vitro and in vivo protective potential of quercetin-3-glucuronide against lipopolysaccharide-induced pulmonary injury through dual activation of nuclear factor-erythroid 2 related factor 2 and autophagy

  • Molecular Toxicology
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Abstract

In vitro and in vivo models of lipopolysaccharide (LPS)-induced pulmonary injury, quercetin-3-glucuronide (Q3G) has been previously revealed the lung-protective potential via downregulation of inflammation, pyroptotic, and apoptotic cell death. However, the upstream signals mediating anti-pulmonary injury of Q3G have not yet been clarified. It has been reported that concerted dual activation of nuclear factor-erythroid 2 related factor 2 (Nrf2) and autophagy may prove to be a better treatment strategy in pulmonary injury. In this study, the effect of Q3G on antioxidant and autophagy were further investigated. Noncytotoxic doses of Q3G abolished the LPS-caused cell injury, and reactive oxygen species (ROS) generation with inductions in Nrf2-antioxidant signaling. Moreover, Q3G treatment repressed Nrf2 ubiquitination, and enhanced the association of Keap1 and p62 in the LPS-treated cells. Q3G also showed potential in inducing autophagy, as demonstrated by formation of acidic vesicular organelles (AVOs) and upregulation of autophagy factors. Next, the autolysosomes formation and cell survival were decreased by Q3G under pre-treatment with a lysosome inhibitor, chloroquine (CQ). Furthermore, mechanistic assays indicated that anti-pulmonary injury effects of Q3G might be mediated via Nrf2 signaling, as confirmed by the transfection of Nrf2 siRNA. Finally, Q3G significantly alleviated the development of pulmonary injury in vivo, which may result from inhibiting the LPS-induced lung dysfunction and edema. These findings emphasize a toxicological perspective, providing new insights into the mechanisms of Q3G’s protective effects on LPS-induced pulmonary injury and highlighting its role in dual activating Nrf2 and autophagy pathways.

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All data of this study are included in this article.

Abbreviations

Q3G:

Quercetin-3-glucuronide

LPS:

Lipopolysaccharide

Nrf2:

Nuclear factor-erythroid 2 related factor 2

ROS:

Reactive oxygen species

AVOs:

Acidic vesicular organelles

CQ:

Chloroquine

SOD:

Superoxide dismutase

GSH:

Glutathione

GST:

Glutathione S-transferase

HO-1:

Heme oxygenase-1

NQO1:

NAD(P)H Quinone dehydrogenase 1

MDA:

Malondialdehyde

Keap1:

Kelch-like ECH-associated protein 1

PI3K:

Phosphatidylinositol 3-kinase

LC3:

Microtubule-associated protein 1A/1B-light chain 3

Dex:

Dexamethasone

HandE:

Hematoxylin and eosin

MLI:

Mean linear intercept

DI:

Destructive index

TUNEL:

Terminal deoxynucleotidyl transferase dUTP nick end labeling

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Acknowledgements

This study was supported by the grant from the National Science and Technology Council (NSTC111-2320-B-040-020), Taiwan.

Funding

This study was supported by the grant from the National Science and Technology Council (NSTC111-2320-B-040-020), Taiwan.

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Contributions

Conceptualization: HHL and JHC; Methodology: PRY, CYT and CCH; Investigation: PRY and CYT; Software: CYT and CCH; Visualization: CCH and JHC; Data curation: PRY, HHL and JHC; Funding acquisition: HHL and JHC; Resources: HHL and JHC; Supervision: HHL and JHC; Writing–original draft: PRY; Writing–review and editing: PRY and HHL.

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Correspondence to Hui-Hsuan Lin.

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Yu, PR., Tseng, CY., Hsu, CC. et al. In vitro and in vivo protective potential of quercetin-3-glucuronide against lipopolysaccharide-induced pulmonary injury through dual activation of nuclear factor-erythroid 2 related factor 2 and autophagy. Arch Toxicol 98, 1415–1436 (2024). https://doi.org/10.1007/s00204-024-03691-9

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