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Human Primary Trophoblast Cell Culture Model to Study the Protective Effects of Melatonin Against Hypoxia/reoxygenation-induced Disruption
Published on: July 30, 2016
Melatonin protects against oxidative damage in a neonatal rat model of bronchopulmonary dysplasia
Li Pan1, Jian-Hua Fu, Xin-Dong Xue
1Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, 110004, China.
Background:
Oxidative stress plays an important role in the pathogenesis of bronchopulmonary dysplasia (BPD). Melatonin (MT) has direct and indirect free radical detoxifying activity. The present study was to investigate whether treatment with MT would attenuate hyperoxia-induced lung injury and the effect of MT on imbalance of oxidants/antioxidants in the lung of neonatal rats.
Methods:
BPD was induced by exposure to hyperoxia in neonatal rats (n=90). The rats were divided randomly into three groups (n=30 each): air-exposed control group, hyperoxia-exposed group, and hyperoxia-exposed MT-treated group. Lung specimens were obtained respectively on day 3, day 7, and day 14 after exposure (n=10 each). Activities of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), and catalase (CAT), and levels of myeloperoxidase (MPO), nitrite/nitrate, and malondialdehyde (MDA) were assayed. Histopathologic changes were observed in the tissues stained with hematoxylin and eosin and Masson's trichrome stain.
Results:
Increased levels of MPO, nitrite/nitrate, and MDA in the hyperoxia-exposed rats were significantly reduced by MT (P<0.05). Activities of GSH-Px, SOD, and CAT which did not change after exposure to hyperoxia were increased by MT (P<0.05). Furthermore, BPD associated histopathological alterations such as reduced total number of alveoli and interstitial fibrosis were obviously abated in the MT-treated group.
Conclusions:
MT can reverse oxidants/antioxidants imbalance in damaged lung tissue and thus exert a beneficial effect on hyperoxia-induced lung disease in neonatal rats. With regard to humans, there may be a protective effect of MT on BPD.
Insights
Melatonin (MT) treatment reduced oxidative stress and improved lung injury in neonatal rats exposed to hyperoxia. This suggests melatonin may protect against bronchopulmonary dysplasia (BPD) in infants.
Area of Science:
- Neonatal physiology
- Pulmonary medicine
- Oxidative stress research
Background:
- Oxidative stress is a key factor in bronchopulmonary dysplasia (BPD) development.
- Melatonin (MT) possesses antioxidant properties, neutralizing free radicals.
- The study investigated MT's efficacy in mitigating hyperoxia-induced lung injury in neonatal rats.
Purpose of the Study:
- To evaluate the protective effects of melatonin against hyperoxia-induced lung injury in neonatal rats.
- To assess melatonin's impact on the oxidant-antioxidant balance in neonatal rat lungs.
- To explore the potential therapeutic role of melatonin in preventing BPD.
Main Methods:
- Bronchopulmonary dysplasia (BPD) was induced in 90 neonatal rats via hyperoxia exposure.
- Rats were divided into control, hyperoxia-exposed, and melatonin-treated groups.
- Lung tissues were analyzed for antioxidant enzyme activities (SOD, GSH-Px, CAT) and oxidative stress markers (MPO, nitrite/nitrate, MDA), alongside histopathological examination.
Main Results:
- Melatonin significantly reduced elevated levels of MPO, nitrite/nitrate, and MDA in hyperoxia-exposed rats.
- Melatonin increased the activities of SOD, GSH-Px, and CAT, which were unchanged by hyperoxia alone.
- Histopathological analysis showed melatonin treatment abated BPD-related alveolar simplification and interstitial fibrosis.
Conclusions:
- Melatonin effectively reverses oxidant/antioxidant imbalances in lung tissue damaged by hyperoxia.
- Melatonin demonstrates a beneficial effect on hyperoxia-induced lung disease in neonatal rats.
- Findings suggest a potential protective role for melatonin in human BPD.
