Abstract:
:1. The leucocyte-mediated inflammatory response plays a pivotal role in ischaemia-reperfusion injury. P-Selectin and CD11b are important mediators for the recruitment of leucocytes into the endothelium. However, the time-course of changes in P-selectin and CD11b expression during reperfusion is not defined. Magnesium has been shown to have a protective role in reperfusion injury, but the mechanism of its action is not yet clear. 2. In the present study, 90 male Sprague-Dawley rats were randomized into three groups, namely a sham-operated group, an IR group (subjected to 45 min of coronary occlusion followed by reperfusion for up to 6 h) and an MgSO(4)-treated group, which received an infusion of MgSO(4) starting 30 min before occlusion and continuing until the onset of reperfusion. The expression of P-selectin on platelets and CD11b on leucocytes, endothelial P-selectin on cardiac microvessels and P-selectin mRNA in myocardial tissue were measured by flow cytometry, immunohistochemistry and reverse transcription-polymerase chain reaction, respectively, at different time points during reperfusion. The degree of myocardial necrosis and arrhythmia was assessed. 3. The present study shows that P-selectin expression on platelets and cardiac microvessels, P-selectin mRNA in myocardial tissue and CD11b expression on leucocytes in the IR group were significantly upregulated compared with the sham-operated group in a time-dependent manner during reperfusion. Treatment with MgSO(4) attenuated the upregulation of P-selectin expression, in addition to inhibiting myocardial necrosis and arrhythmia, but had no effect on CD11b expression on leucocytes. 4. These results suggest that the expression of P-selectin and CD11b is upregulated after reperfusion and magnesium pretreatment plays a cardioprotective role in ischaemia-reperfusion injury, possibly by inhibiting the upregulation of P-selectin expression.
journal_name
Clin Exp Pharmacol Physioljournal_title
Clinical and experimental pharmacology & physiologyauthors
Ying SQ,Fang L,Xiang MX,Xu G,Shan J,Wang JAdoi
10.1111/j.1440-1681.2007.04697.xsubject
Has Abstractpub_date
2007-12-01 00:00:00pages
1234-9issue
12eissn
0305-1870issn
1440-1681pii
CEP4697journal_volume
34pub_type
杂志文章abstract::1. The present experiments were performed in order to study the role of the sarcoplasmic reticulum (SR) in the altered action potential and contraction of ventricular myocardium obtained from myopathic Syrian hamster and explanted human hearts (n = 8). The hamsters included age-matched healthy hamsters (F1B; n = 18), ...
journal_title:Clinical and experimental pharmacology & physiology
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doi:10.1046/j.1440-1681.2003.03820.x
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pub_type: 杂志文章,评审
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abstract::Radiation-induced lung injury (RILI) is a serious complication in thoracic tumour radiotherapy. It often occurs in clinical chest radiotherapy and acute whole-body irradiation (WBI) caused by nuclear accidents or nuclear weapon attack. Some radioprotective agents have been reported to exert protective effects when giv...
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journal_title:Clinical and experimental pharmacology & physiology
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abstract::1. Epidemiological evidence indicates that low birthweight increases the risk of a number of adult-onset diseases. It is now apparent that many babies with a low birthweight may have been subjected to a combination of reduced growth rates in utero as well as preterm birth. However, the long-term effects of preterm bir...
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更新日期:1998-09-01 00:00:00
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pub_type: 杂志文章
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更新日期:2014-08-01 00:00:00
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journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
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更新日期:1980-03-01 00:00:00