ABSTRACT
Objective To investigate the effects of aldosterone on the expression of endothelin(ET)in cultured neonatal rat cardiac fibroblasts(CFs).Methods CFs were isolated by trypsin digestion.ET concentration in conditioned medium was measured by radioimmunoassay,intracellular ET-1 level was evaluated by immunofluorescence assay,and the expression of preproendothelin-1(ppET-1)was detected using reverse transcriptase-polymerase chain reaction(RT-PCR)method.Results Aldosterone(10-9,10-8,10-7 mol/L)induced a dose-dependent changes in ppET-1 mRNA expression,as well as ET-1 synthesis and secretion in CFs.Meanwhile,aldosterone(10-7 mol/L)time-related induced ppET-1 mRNA expression in CFs,which began to increase in 2 h and reached the highest level in 4 h,thereafter decreased.The effects of aldosterone(10-7 mol/L)were significantly inhibited by the pre-incubation with spironolactone(10-6 mol/L).Conclusion Aldosterone increases the expression of ppET-1 mRNA,ET-1 synthesis and secretion via mineralocorticoid receptor.
ABSTRACT
Objective To evaluate the safety and efficacy of intravenous dalteparin compared with unfractionated heparin in patients underwent coronary angiogram with or without percutaneous coronary intervention(PCI).Methods A total of 87 patients who underwent one-stage elective PCI were randomized to intravenously unfractionated heparin(UFH,10 000 IU) group or dalteparin group.The dalteparin group was further divided into low dose dalteparin(5 000 IU) group or high dose dalteparin(10 000 IU) group according to whether the patients underwent PCI procedure.Blood samples for anti-Xa levels and ACTs were assayed at baseline and at 10 min,20 min,1 hour,2 hours and 4 hours after all dalteparin or UFH doses were administered.Results Baseline characteristics were similar across the three groups.In all groups,ACTs reached the maximum at 10 min after the total doses given,with the highest value in the UFH group and lowest in the low dose dalteparin group(524.68 ?278.32 s vs 191.26?39.35 s vs 304.20?42.71 s,P0.05).Conclusion Both 5 000 IU and 10 000 IU dalteparin injected through sheath before PCI or coronary angiography could reach an anti-Xa levels similar to that achieved by 10 000 IU UFH.