Adrenergic activation of cardiac phospholipase D: role of α1-adrenoceptor subtypes

Adrenergic activation of cardiac phospholipase D: role of α1-adrenoceptor subtypes
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心脏磷脂酶 D 的肾上腺素激活:α1-肾上腺素受体亚型的作用

DOI:
10.1016/s0008-6363(01)00566-1
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发表时间:
2002
影响因子:
10.8
通讯作者:
T. Kurz
T. Kurz
中科院分区:
医学1区
文献类型:
--
作者:
K. Mier;D. Kemken;H. Katus;G. Richardt;T. Kurz

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目的:肾上腺素能刺激心脏,激活磷脂酶D信号转导通路,形成细胞内第二信使磷脂酸和甘油二酯,可能通过激活丝裂原活化蛋白激酶和蛋白激酶C在心肌肥厚的发生发展中发挥作用。到目前为止,肾上腺素能受体亚型介导激活心脏磷脂酶D.Methods:我们开发了一种测定磷脂酶D活性在离体灌流大鼠心脏。利用磷脂酶D特异性转磷脂酰化反应,在1%乙醇存在下灌注的大鼠心脏中形成稳定产物磷脂酰乙醇(PEtOH)。以心肌PEtOH形成量作为磷脂酶D活性的指标,采用高效液相色谱法和蒸发光散射检测法(PEtOH μg/mg心肌蛋白)测定心肌PEtOH形成量。用去甲肾上腺素刺激心脏导致浓度依赖性磷脂酶D激活,在100 μmol/l去甲肾上腺素下形成最大PEtOH(0.17±0.01 μg/mg)。去甲肾上腺素诱导的PLD活性增加可被α1肾上腺素受体拮抗剂哌唑嗪完全阻断,而不受β肾上腺素受体拮抗剂普萘洛尔的影响。用选择性α1-肾上腺素受体拮抗剂进一步表征α1-肾上腺素受体亚型表明,WB 4101(α 1 A-选择性:0.06±0.01 μg/mg)和BMY 7378(α 1 D-选择性:0.07±0.01 μg/mg)完全抑制去甲肾上腺素诱导的磷脂酶D激活。α 1 B受体阻断剂氯乙基可乐定对去甲肾上腺素刺激的磷脂酶D活性无抑制作用(0.14±0.01 μg/mg)。在这里,α 1A肾上腺素受体亚型,而不是α 1B肾上腺素受体亚型与心脏磷脂酶D的激活偶联。
Objective:Adrenergic stimulation of the heart leads to activation of the phospholipase D signal transduction pathway with formation of the intracellular second messengers phosphatidic acid and diacylglycerol, which may play a role in the development of myocardial hypertrophy by activating mitogen-activated protein kinases and protein kinase C. So far, the adrenergic receptor subtypes mediating activation of cardiac phospholipase D are not known.Methods:We developed an assay for determination of phospholipase D activity in the isolated perfused rat heart. Utilizing the phospholipase D specific transphosphatidylation reaction the stable product phosphatidylethanol (PEtOH) is formed in rat hearts perfused in the presence of 1% ethanol. Myocardial PEtOH formation was used as a marker of phospholipase D activity and was determined by HPLC and evaporative light-scattering detection (PEtOH μg/mg myocardial protein).Results:Basal PEtOH formation in unstimulated hearts was 0.06±0.01 μg/mg. Stimulation of the hearts with norepinephrine resulted in a concentration-dependent phospholipase D activation with a maximum formation of PEtOH (0.17±0.01 μg/mg) at 100 μmol/l norepinephrine. The norepinephrine-induced increase in PLD activity was completely blocked by the α1-adrenoceptor antagonist prazosin and was unaffected by the β-adrenoceptor antagonist propranolol. Further characterisation of α1-adrenoceptor subtypes with selective α1-adrenoceptor antagonists demonstrated a complete inhibition of the norepinephrine-induced phospholipase D activation by WB 4101 (α1A-selective: 0.06±0.01 μg/mg) and by BMY 7378 (α1D-selective: 0.07±0.01 μg/mg). In contrast, the α1B-adrenoceptor antagonist chloroethylclonidine had no inhibitory effect on norepinephrine-stimulated phospholipase D activity (0.14±0.01 μg/mg).Conclusion:Adrenergic activation of the cardiac phospholipase D signal transduction pathway is mediated by α1-adrenoceptors. Here, the α1A-adrenoceptor subtype, but not the α1B-adrenoceptor are coupled to activation of cardiac phospholipase D.
缺血预处理触发大鼠心脏中的磷脂酶 D 信号传导。
DOI: 10.1152/ajpheart.1997.273.4.h1860
发表时间: 1997
期刊: The American journal of physiology
影响因子: --
作者:
Tosaki,A;Maulik,N;Cordis,G;Trifan,OC;Popescu,LM;Das,DK
通讯作者: Das,DK
用去氧肾上腺素刺激 Alpha-1A 肾上腺素受体可通过激活rat-1成纤维细胞中的磷脂酶 D 促进花生四烯酸释放:蛋白激酶 A 的抑制。
DOI: --
发表时间: 1998
期刊: The Journal of pharmacology and experimental therapeutics
影响因子: --
作者:
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DOI: 10.1161/01.res.72.3.701
发表时间: 1993
影响因子: 20.1
作者:
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成年兔心室肌细胞对去甲肾上腺素和内皮素-1 的反应导致磷脂酸增加。
DOI: 10.1093/cvr/28.12.1828
发表时间: 1994
影响因子: 10.8
作者:
Ye,H;Wolf,RA;Kurz,T;Corr,PB
通讯作者: Corr,PB
DOI: 10.1161/01.cir.94.7.1713
发表时间: 1996-10-01
期刊: CIRCULATION
影响因子: 37.8
作者:
Cohen, MV;Liu, YG;Downey, JM
通讯作者: Downey, JM