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Updated: Dec 30, 2025
Development of a Neonatal Piglet Acute Lung Injury Model Recreating the Early Environment of Preterm Infant Lungs
Published on: October 31, 2025
[Expression of P38 MAPK and MMP-2 mRNA in neonatal rats with hyperoxia-induced lung injury]
1Department of Neonatology, Children's Hospital of Soochow University, Suzhou, Jiangsu 215003, China.
Objective:
To observe P38 mitogen-activated protein kinase (P38 MAPK) and matrix metalloproteinase-2 (MMP-2) mRNA expression level changes in neonatal rats with hyperoxia-induced lung injury,and to investigate the influence of P38 MAPK activation on MMP-2 mRNA expression.
Methods:
Thirty-six Sprague-Dawley (SD) rats were randomly divided into three groups: air control, hyperoxia and SB203580-treated hyperoxia (n=12). The rats were sacrificed on the 3rd and 7th days and the lungs were removed. Hematoxylin-eosine staining was used to observe the pathological changes in lung tissues.
Results:
Compared with the air and SB203580-treated groups, levels of P38 MAPK and MMP-2 mRNA significantly increased in the hyperoxia group (P<0.01).
Conclusions:
Expression of P38 MAPK increases in neonatal rats with hyperoxia-induced acute lung injury and this may play a role in control of the expression of MMP-2 mRNA.
Insights
Hyperoxia exposure significantly increases P38 mitogen-activated protein kinase (P38 MAPK) and matrix metalloproteinase-2 (MMP-2) mRNA in neonatal rat lungs. P38 MAPK activation appears to regulate MMP-2 mRNA expression in acute lung injury.
Area of Science:
- Molecular Biology
- Cellular Biology
- Pathology
Context:
- Neonatal acute lung injury (ALI) is a significant clinical challenge.
- Hyperoxia is a known cause of ALI in premature infants.
- Understanding molecular mechanisms of hyperoxia-induced lung injury is crucial for developing targeted therapies.
Purpose:
- To investigate the expression of P38 mitogen-activated protein kinase (P38 MAPK) and matrix metalloproteinase-2 (MMP-2) mRNA in neonatal rats with hyperoxia-induced lung injury.
- To explore the role of P38 MAPK activation in regulating MMP-2 mRNA expression.
Summary:
- Hyperoxia exposure led to significant increases in both P38 MAPK and MMP-2 mRNA levels in neonatal rat lungs.
- Pathological changes were observed in lung tissues of hyperoxia-exposed rats.
- Inhibition of P38 MAPK with SB203580 in hyperoxia-exposed rats mitigated these increases, suggesting a regulatory role.
Impact:
- This study elucidates the involvement of the P38 MAPK signaling pathway in hyperoxia-induced ALI.
- Findings suggest that P38 MAPK may be a potential therapeutic target for managing neonatal lung injury.
- Further research into the P38 MAPK-MMP-2 axis could lead to novel treatment strategies.
