Objective To examine the effects of exogenously administered intermedin （IMD,adrenomedullin-2） on arterial blood pressure,cardiac function and the cardiovascular IMD receptor system in spontaneously hypertensive ra...Objective To examine the effects of exogenously administered intermedin （IMD,adrenomedullin-2） on arterial blood pressure,cardiac function and the cardiovascular IMD receptor system in spontaneously hypertensive rats （SHRs） as well as to investigate the associated mechanisms.Methods Thirteen week-old male rats were divided in Wistar Kyoto （WKY） group （n =12）,SHR group （n =12）,IMD group （SHRs infused with IMD 1-47 500 ng/kg per hour,n =12）,and ADM group （SHRs infused with adrenomedullin 500 ng/kg per hour,n =12）.Results A two-week continuous administration of low dose IMD 1-47 via mini-osmotic pumps markedly reduced blood pressure,the maximal rates of increase and decrease of left-ventricle pressure development （LV ± dp/dtmax）,left ventricular systolic pressure and heart rate in SHRs.Furthermore,IMD also inhibited protein over-expression of cardiovascular IMD receptors,myocardial Receptor Activity-Modifying Proteins （RAMP1 and RAMP2）,aortic RAMP1,RAMP2,RAMP3,and calcitonin receptor-like receptor （CRLR）;suppressed up-regulation of aortic RAMP1,RAMP2,RAMP3 and CRLR gene expression; and markedly elevated the mRNA abundance of myocardial atrial natriuretic peptide （ANP） and myocardial brain natriuretic peptide （BNP）.Additionally,IMD 1-47 administration in SHRs increased aortic cAMP concentration and reduced myocardial cAMP concentration.Conclusion These findings support the speculation that IMD,as a cardiovascular active peptide,is involved in blood pressure reduction and cardiac function amelioration during hypertension.The mechanism underlying this effect may involve IMD binding of a receptor complex formed by RAMPs and CRLR,and consequential regulation of cAMP levels and other cardiovascular active factors,such as ANP and BNP.展开更多
目的系统评估降钙素受体(CRT)基因多态性与中国绝经后妇女骨密度的关系。方法计算机检索Pubmed、Embase、Web of science、Cochrane library、中国知网(CNKI)、维普(VIP)、万方数据库及中国生物医药文献数据库(CBD),收集有关CRT基因多...目的系统评估降钙素受体(CRT)基因多态性与中国绝经后妇女骨密度的关系。方法计算机检索Pubmed、Embase、Web of science、Cochrane library、中国知网(CNKI)、维普(VIP)、万方数据库及中国生物医药文献数据库(CBD),收集有关CRT基因多态性与中国绝经后妇女骨密度的关系的文献,按照纳入和排除标准筛选文献并提取数据,采用Rev Man5.3、Stata12.0软件进行Meta分析,计算合并加权均数差(WMD)值和95%CI,并采用Begg检验和Egger检验进行发表偏倚评价,逐一排除法进行敏感性分析。结果共纳入7篇文献,累计病例1702例。Meta分析结果显示CRT基因多态性与北方绝经后妇女L2-4、大转子、Ward三角骨密度有关(P<0.05),与南方绝经后妇女大转子骨密度有关(P<0.05)。北方绝经后妇女CRT CC基因型大转子处骨密度较高(CC vs CT:WMD=0.05,95%CI=0.03~0.08,P<0.00001;CC vs CT+TT:WMD=0.04,95%CI=0.01~0.07,P=0.003),南方绝经后妇女CRT CC基因型大转子处骨密度则相反(CC vs CT:WMD=-0.35,95%CI=-0.66^-0.03,P=0.03;CC vs CT+TT:WMD=-0.36,95%CI=-0.67^-0.05,P=0.02)。结论 CRT基因多态性可能与中国绝经后妇女骨密度有关,可作为预测骨质疏松和骨折风险的遗传指标。展开更多
文摘Objective To examine the effects of exogenously administered intermedin （IMD,adrenomedullin-2） on arterial blood pressure,cardiac function and the cardiovascular IMD receptor system in spontaneously hypertensive rats （SHRs） as well as to investigate the associated mechanisms.Methods Thirteen week-old male rats were divided in Wistar Kyoto （WKY） group （n =12）,SHR group （n =12）,IMD group （SHRs infused with IMD 1-47 500 ng/kg per hour,n =12）,and ADM group （SHRs infused with adrenomedullin 500 ng/kg per hour,n =12）.Results A two-week continuous administration of low dose IMD 1-47 via mini-osmotic pumps markedly reduced blood pressure,the maximal rates of increase and decrease of left-ventricle pressure development （LV ± dp/dtmax）,left ventricular systolic pressure and heart rate in SHRs.Furthermore,IMD also inhibited protein over-expression of cardiovascular IMD receptors,myocardial Receptor Activity-Modifying Proteins （RAMP1 and RAMP2）,aortic RAMP1,RAMP2,RAMP3,and calcitonin receptor-like receptor （CRLR）;suppressed up-regulation of aortic RAMP1,RAMP2,RAMP3 and CRLR gene expression; and markedly elevated the mRNA abundance of myocardial atrial natriuretic peptide （ANP） and myocardial brain natriuretic peptide （BNP）.Additionally,IMD 1-47 administration in SHRs increased aortic cAMP concentration and reduced myocardial cAMP concentration.Conclusion These findings support the speculation that IMD,as a cardiovascular active peptide,is involved in blood pressure reduction and cardiac function amelioration during hypertension.The mechanism underlying this effect may involve IMD binding of a receptor complex formed by RAMPs and CRLR,and consequential regulation of cAMP levels and other cardiovascular active factors,such as ANP and BNP.
文摘目的系统评估降钙素受体(CRT)基因多态性与中国绝经后妇女骨密度的关系。方法计算机检索Pubmed、Embase、Web of science、Cochrane library、中国知网(CNKI)、维普(VIP)、万方数据库及中国生物医药文献数据库(CBD),收集有关CRT基因多态性与中国绝经后妇女骨密度的关系的文献,按照纳入和排除标准筛选文献并提取数据,采用Rev Man5.3、Stata12.0软件进行Meta分析,计算合并加权均数差(WMD)值和95%CI,并采用Begg检验和Egger检验进行发表偏倚评价,逐一排除法进行敏感性分析。结果共纳入7篇文献,累计病例1702例。Meta分析结果显示CRT基因多态性与北方绝经后妇女L2-4、大转子、Ward三角骨密度有关(P<0.05),与南方绝经后妇女大转子骨密度有关(P<0.05)。北方绝经后妇女CRT CC基因型大转子处骨密度较高(CC vs CT:WMD=0.05,95%CI=0.03~0.08,P<0.00001;CC vs CT+TT:WMD=0.04,95%CI=0.01~0.07,P=0.003),南方绝经后妇女CRT CC基因型大转子处骨密度则相反(CC vs CT:WMD=-0.35,95%CI=-0.66^-0.03,P=0.03;CC vs CT+TT:WMD=-0.36,95%CI=-0.67^-0.05,P=0.02)。结论 CRT基因多态性可能与中国绝经后妇女骨密度有关,可作为预测骨质疏松和骨折风险的遗传指标。
