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Author Spotlight: Insights into the Effect of Ischemia Reperfusion on Lung Transplantation
Published on: April 12, 2024
Melatonin attenuates lung injury in a hind limb ischemia-reperfusion rat model
Hamed Takhtfooladi1, Mohammad Takhtfooladi2, Fariborz Moayer3
1Faculty of Veterinary Science, Karaj Branch, Islamic Azad University, Karaj, Iran.
Objective:
This study evaluated the protective antioxidant effect of melatonin on lung injury as a remote organ after skeletal muscle ischemia-reperfusion in rats.
Methods:
Thirty male Wistar rats were allocated randomly into three experimental groups: operated with no ischemia (Sham) group, ischemia-reperfusion group and ischemia-reperfusion+melatonin group. Hind limb ischemia was induced by clamping the femoral artery. After 2h ischemia, the clamp was removed and the animal underwent 24h reperfusion. Rats in the ischemia-reperfusion + melatonin group received melatonin (10 mg/kg i.v.), immediately before the clamp was removed. At the end of the trial, animals were euthanized and the lungs were removed for water content determination, histopathological and biochemical studies.
Results:
In the ischemia-reperfusion + melatonin group, tissues showed less intense histological abnormalities such as neutrophilic infiltration, intra-alveolar hemorrhage and edema compared with the ischemia-reperfusion group. Histopathologically, there was a significant difference (P < 0.05) between the two groups. The lung water content in the ischemia-reperfusion + melatonin group was significantly lower than the ischemia-reperfusion group (P < 0.05). Lung tissue myeloperoxidase (MPO) activity and nitric oxide (NO) level were significantly (P < 0.05) increased by ischemia-reperfusion. The increase in these parameters was reduced by melatonin. Comparing the ischemia-reperfusion+melatonin group with the sham group, no significant increase in all analyzed aspects of the research was observed.
Conclusions:
These findings suggest that melatonin has preventive effects in lung tissue injury after transient femoral artery occlusion.
Insights
Melatonin administration significantly reduced lung injury caused by skeletal muscle ischemia-reperfusion in rats. This antioxidant effect protected lung tissue from damage and inflammation.
Area of Science:
- Physiology
- Toxicology
- Pharmacology
Background:
- Skeletal muscle ischemia-reperfusion can cause remote organ damage, particularly in the lungs.
- Oxidative stress plays a key role in the pathogenesis of ischemia-reperfusion injury.
- Melatonin is a potent antioxidant with potential protective effects.
Purpose of the Study:
- To evaluate the protective antioxidant effect of melatonin on lung injury.
- To investigate melatonin's role in mitigating lung damage following skeletal muscle ischemia-reperfusion.
Main Methods:
- Male Wistar rats were divided into sham, ischemia-reperfusion, and ischemia-reperfusion + melatonin groups.
- Hind limb ischemia was induced for 2 hours, followed by 24 hours of reperfusion.
- Melatonin (10 mg/kg) was administered intravenously before reperfusion.
Main Results:
- Melatonin treatment significantly reduced lung histological abnormalities, edema, and water content.
- Lung tissue myeloperoxidase activity and nitric oxide levels were decreased by melatonin.
- No significant lung injury was observed in the melatonin-treated group compared to the sham group.
Conclusions:
- Melatonin exhibits preventive effects against lung tissue injury.
- The antioxidant properties of melatonin are beneficial in reducing ischemia-reperfusion-induced lung damage.
