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Magnesium Sulfate Mitigates Lung Injury Induced by Bilateral Lower Limb Ischemia-Reperfusion in Rats
- Source :
-
Journal of Surgical Research . Nov2011, Vol. 171 Issue 1, pe97-e106. 0p. - Publication Year :
- 2011
-
Abstract
- Background: Lower limb ischemia-reperfusion (I/R) elicits oxidative stress and causes inflammation in lung tissues that may lead to lung injury. Magnesium sulfate (MgSO4) possesses potent anti-oxidation and anti-inflammation capacity. We sought to elucidate whether MgSO4 could mitigate I/R-induced lung injury. As MgSO4 is an L-type calcium channel inhibitor, the role of the L-type calcium channels was elucidated. Materials and Methods: Adult male rats were allocated to receive I/R, I/R plus MgSO4 (10, 50, or 100 mg/kg), or I/R plus MgSO4 (100 mg/kg) plus the L-type calcium channels activator BAY-K8644 (20 μg/kg) (n = 12 in each group). Control groups were run simultaneously. I/R was induced by applying rubber band tourniquets high around each thigh for 3 h followed by reperfusion for 3 h. After euthanization, degrees of lung injury, oxidative stress, and inflammation were determined. Results: Arterial blood gas and histologic assays, including histopathology, leukocyte infiltration (polymorphonuclear leukocytes/alveoli ratio and myeloperoxidase activity), and lung water content, confirmed that I/R caused significant lung injury. Significant increases in inflammatory molecules (chemokine, cytokine, and prostaglandin E2 concentrations) and lipid peroxidation (malondialdehyde concentration) confirmed that I/R caused significant inflammation and oxidative stress in rat lungs. MgSO4, at the dosages of 50 and 100 mg/kg but not 10 mg/kg, attenuated the oxidative stress, inflammation, and lung injury induced by I/R. Moreover, BAY-K8644 reversed the protective effects of MgSO4. Conclusions: MgSO4 mitigates lung injury induced by bilateral lower limb I/R in rats. The mechanisms may involve inhibiting the L-type calcium channels. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00224804
- Volume :
- 171
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Journal of Surgical Research
- Publication Type :
- Academic Journal
- Accession number :
- 66678596
- Full Text :
- https://doi.org/10.1016/j.jss.2011.03.028