生物活性 | |||
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描述 | Cyclic nucleotide phosphodiesterases (PDEs) from the human heart were separated into three isoforms, FI, FII and FIII. Milrinone has been proved to be a potent and selective inhibitor of human cardiac FIII PDE, a "low Km" enzyme for cyclic AMP (cAMP-PDE). The IC50 value for the inhibition of FIII PDE was 0.42 μM, while those of FI and FII PDEs, "high Km" enzymes, were 38 and 19 μM, respectively[3]. The concentration of milrinone that produced 50% relaxation of tracheal spirals constricted by carbachol was 3.6 × 10-5 M; The IC50 for milrinone for lung parenchymal strips contracted by histamine was 3.2 × 10-5 M; Milrinone relaxed pulmonary artery rings constricted by norepinephrine with an IC50 of 3.8 × 10-6 M[4]. Milrinone caused a concentration-dependent increase in the cAMP level in rabbit and human platelets with similar potency. Furthermore, milrinone inhibited human platelet aggregation with an IC50 of 2 μM. It was a very potent cardiotonic agent, which concentration-dependently increased left ventricular developed pressure (LVDP) and contractility as well as cAMP in rabbit coronary smooth muscle cells[5]. In rabbit heart, partial inhibition of PDE4 by milrinone contributed to greater increases in cardiomyocyte cAMP and calcium levels[6]. In mongrel dogs underwent pulmonary artery catheterization, Milrinone led to significant increases in right ventricular function as well as significant improvements in pulmonary vascular resistance, pulmonary blood flow, and left ventricular filling[7]. |
临床研究 | |||||
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NCT号 | 适应症或疾病 | 临床期 | 招募状态 | 预计完成时间 | 地点 |
NCT02606253 | Heart Failure | Phase 4 | Active, not recruiting | October 31, 2018 | United States, Tennessee ... 展开 >> Vanderbilt University Medical Center Nashville, Tennessee, United States, 37204 收起 << |
NCT02884011 | - | Completed | - | United States, Illinois ... 展开 >> Rush Univeristy Medical Center Chicago, Illinois, United States, 60612 收起 << | |
NCT02261506 | Bacteremia | Not Applicable | Completed | - | Canada, Alberta ... 展开 >> Foothills Hospital Calgary, Alberta, Canada University of Alberta Hospital Edmonton, Alberta, Canada Canada, British Columbia Royal Columbian Hospital Vancouver, British Columbia, Canada St. Paul's Hospital Vancouver, British Columbia, Canada Canada, Manitoba St. Boniface Hospital Winnipeg, Manitoba, Canada Canada, Nova Scotia Queen Elizabeth II Hospital Halifax, Nova Scotia, Canada Canada, Ontario Kingston General Hospital Kingston, Ontario, Canada London Health Sciences Centre London, Ontario, Canada The Ottawa Hospital Ottawa, Ontario, Canada Sunnybrook Health Sciences Centre Toronto, Ontario, Canada, M4N3M5 Mount Sinai Hospital Toronto, Ontario, Canada St. Michael's Hospital Toronto, Ontario, Canada Toronto Western Hospital Toronto, Ontario, Canada Canada, Quebec CHUM Montreal, Quebec, Canada Université de Sherbrooke Sherbrooke, Quebec, Canada Canada Centre hospitalier affilié universitaire de Québec Quebec, Canada CSSS de Trois-Rivières Quebec, Canada 收起 << |
实验方案 | |||
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1mg | 5mg | 10mg | |
1 mM 5 mM 10 mM |
4.73mL 0.95mL 0.47mL |
23.67mL 4.73mL 2.37mL |
47.34mL 9.47mL 4.73mL |
参考文献 |
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