Abstract
Bronchopulmonary dysplasia (BPD) is a common devastating pulmonary complication in preterm infants. Supplemental oxygen is a lifesaving therapeutic measure used for premature infants with pulmonary insufficiency. However, oxygen toxicity is a significant trigger for BPD. Oxidative stress disrupts lung development, accompanied by increased pro-inflammatory cytokines and chemokines expression and immune cells infiltration in lung tissue. Licorice, a typical traditional herbal medicine, is commonly used in the medicine and food industries. 18β-Glycyrrhetinic acid (18β-GA), a primary active ingredient of licorice, has powerful anti-oxidative and anti-inflammatory effects. This study aimed to determine whether 18β-GA has a protective effect on neonatal rats with hyperoxia exposure. Newborn Sprague–Dawley rats were kept in either 21% (normoxia) or 80% O2 (hyperoxia) continuously from postnatal day (PN) 1 to 14. 18β-GA was injected intragastrically at 50 or 100 mg/kg body weight once a day from PN 1 to 14. We examined the body weight and alveolar development and measured ROS level and the markers of pulmonary inflammation. Mature-IL-1β and NF-κB pathway proteins, and the NLRP3 inflammasome, were assessed; concurrently, caspase-1 activity was measured. Our results indicated that hyperoxia resulted in alveolar simplification and decreased bodyweight of neonatal rats. Hyperoxia increased ROS level and pulmonary inflammation and activated NF-κB and the NLRP3 inflammasome. 18β-GA treatment inhibited the activation of NF-κB and the NLRP3 inflammasome, decreased ROS level and pulmonary inflammation, improved alveolar development, and increased the bodyweight of neonatal rats with hyperoxia exposure. Our study demonstrates that 18β-GA has a protective effect on neonatal rats with hyperoxia exposure.
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Availability of Data and Materials
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- 18β-GA:
-
18β-Glycyrrhetinic acid
- ASC:
-
Apoptosis-associated Specklike protein containing CARD
- BPD:
-
Bronchopulmonary dysplasia
- CINC-1:
-
Cytokine-induced neutrophil chemoattractant-1
- DCFH-DA:
-
Dichlorodihydrofluorescein diacetate
- ELISA:
-
Enzyme-linked immunosorbent assay
- MIF:
-
Macrophage migration inhibitory factor
- MIP-2:
-
Macrophage inflammatory protein-2
- MPO:
-
Myeloperoxidase
- NAC:
-
N-acetyl-L-cysteine
- NAG:
-
N-Acetyl-β-D-glucosaminidase
- NF-κB:
-
Nuclear factor-κB
- NLRP3:
-
NOD-, LRR-, and pyrin-domain containing protein 3
- PN:
-
Postnatal day
- PVDF:
-
Polyvinylidene fluoride
- RAC:
-
Radial alveolar count
- ROS:
-
Reactive oxygen species
- SD:
-
Sprague-Dawley
- TBST:
-
Tris-buffered saline and Tween-20
- Th2:
-
T helper type 2
- TNF:
-
Tumor necrosis factor
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Acknowledgements
The authors would like to thank Professor Dongyan Liu from the Department of Immunology, Shengjing Hospital of China Medical University, for technical support.
Funding
This study was supported by grants from the National Natural Science Foundation of China (grant no. 81571479) and the 345 Talent Project of the Shengjing Hospital (grant no. M0428).
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QC, XX, and JF conceived and designed the study. QC, ZL, XZ, and XY performed the experiments. QC, ZL, XZ, and XY analyzed the data. XX and JF reviewed the data. QC wrote the manuscript. All authors read and approved the final manuscript.
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Qing, C., Ziyun, L., Xuefei, Y. et al. Protective Effects of 18β-Glycyrrhetinic Acid on Neonatal Rats with Hyperoxia Exposure. Inflammation 45, 1224–1238 (2022). https://doi.org/10.1007/s10753-021-01616-7
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DOI: https://doi.org/10.1007/s10753-021-01616-7