Role of myocardial calcium-sensing receptor in a rats model of high-level spinal cord injury / 中华麻醉学杂志

ABSTRACT

ObjectiveTo investigate the role of myocardial calcium-sensing receptor (CaSR) in a rat model of high-level spinal cord injury (SCI).MethodsEighteen healthy male SD rats weighing 250-300 g were randomly divided into 2 groupssham operation group(group S,n ＝6) and SCI group(n ＝ 12).SCI model was induced by dropping a 10 g weight onto spinal cord (C7) in freely vertical falling along the hollow glass tube from 5 cm height.The blood samples were taken 12 and 24 h after SCI in group SCI and 12 h after SCI in group S,and serum activity of creatine kinase(CK) and MB isoenzyme of creatine kinsse(CK-MB) were measured.Then myocardium specimens were obtained for uhrastructure examination and determination of CaSR mRNA and protien expression by fluorescence quantitative RCR and Western blot.Results Serum activities of CK and CK-MB and CaSR mRNA and protein expression were higher in group SCI than in group S.Serum activity of CK and CaSR mRNA expression were higher,and serum activity of CK-MB was lower at 24 h after SCI than that at 12 h after SCI.There was no significantly difference in CaSR protein expression between the two time points in group SCI.The ultrastructure examination showed that myocardial injury was found in group SCI.ConclusionThe expression of CaSR is up-regulated after SCI in rats,which might be the mechanism of myocardial injury after SCI.