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Glutamine inhibits inflammation, oxidative stress, and apoptosis and ameliorates hyperoxic lung injury

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Abstract

Glutamine (Gln) is the most widely acting and abundant amino acid in the body and has anti-inflammatory properties, regulates body metabolism, and improves immune function. However, the mechanism of Gln’s effect on hyperoxic lung injury in neonatal rats is unclear. Therefore, this work focused on examining Gln’s function in lung injury of newborn rats mediated by hyperoxia and the underlying mechanism. We examined body mass and ratio of wet-to-dry lung tissue weights of neonatal rats. Hematoxylin and eosin (HE) staining was performed to examine histopathological alterations of lung tissues. In addition, enzyme-linked immunoassay (ELISA) was conducted to measure pro-inflammatory cytokine levels within bronchoalveolar lavage fluid (BALF). Apoptosis of lung tissues was observed using TUNEL assay. Western blotting was performed for detecting endoplasmic reticulum stress (ERS)-associated protein levels. The results showed that Gln promoted body weight gain, significantly reduced pathological damage and oxidative stress in lung tissue, and improved lung function in neonatal rats. Gln reduced pro-inflammatory cytokine release as well as inflammatory cell production in BALF and inhibited apoptosis in lung tissue cells. Furthermore, we found that Gln could downregulate ERS-associated protein levels (GRP78, Caspase-12, CHOP) and inhibit c-Jun N-terminal kinase (JNK) and inositol-requiring enzyme 1 alpha (IRE1α) phosphorylation. These results in an animal model of bronchopulmonary dysplasia (BPD) suggest that Gln may have a therapeutic effect on BPD by reducing lung inflammation, oxidative stress, and apoptosis and improving lung function; its mechanism of action may be related to the inhibition of the IRE1α/JNK pathway.

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Funding

We are grateful for the financial support from the National Natural Science Foundation of China (No. 81860279) and Jilin Province Health and Health Science and Technology Capacity Enhancement Program Project (No. 2020Q001). This study was supported by the Department of Paediatrics of the Affiliated Hospital of Yanbian University and the Morphology Experimental Centre of Yanbian University.

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Contributions

The authors declare that all data were generated in-house and that no paper mill was used. SZ and TY conceived and designed the experiments; SZ and TY performed the experiments; CJ, XL, and XG analyzed the data; XG and TY contributed reagents, materials, and analysis tools; SZ, XL, and JL wrote the paper; ZJ and JL edited and approved the final draft.

Corresponding authors

Correspondence to Zhengyong Jin or Jinliang Li.

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The authors declare no competing interests.

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All procedures were approved by the Medical Ethics Committee of the College of Medicine, Yanbian University (approval number: 20210429).

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Key points

1. Glutamine treatment reduces the levels of inflammatory cells and pro-inflammatory cytokines.

2. Glutamine treatment reduces levels of oxidative stress-related factors.

3. Glutamine treatment can improve lung function.

4. Glutamine is a potential drug for the treatment of BPD.

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Zhang, S., Li, X., Yuan, T. et al. Glutamine inhibits inflammation, oxidative stress, and apoptosis and ameliorates hyperoxic lung injury. J Physiol Biochem 79, 613–623 (2023). https://doi.org/10.1007/s13105-023-00961-5

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  • DOI: https://doi.org/10.1007/s13105-023-00961-5

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