Adrenergic activation of cardiac phospholipase D: role of α1-adrenoceptor subtypes
Adrenergic activation of cardiac phospholipase D: role of α1-adrenoceptor subtypes
复制标题
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
复制
发表时间:
2002
影响因子:
10.8
通讯作者:
T. Kurz
中科院分区:
文献类型:
--
作者:
K. Mier;D. Kemken;H. Katus;G. Richardt;T. Kurz
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.
登录
查看更多内容
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
DOI:
--
发表时间:
1998
期刊:
The Journal of pharmacology and experimental therapeutics
影响因子:
--
作者:
Ruan,Y;Kan,H;Parmentier,JH;Fatima,S;Allen,LF;Malik,KU
通讯作者:
Malik,KU
影响因子:
20.1
作者:
Kurz,T;Wolf,RA;Corr,PB
通讯作者:
Corr,PB
影响因子:
10.8
作者:
Ye,H;Wolf,RA;Kurz,T;Corr,PB
通讯作者:
Corr,PB
影响因子:
37.8
作者:
Cohen, MV;Liu, YG;Downey, JM
通讯作者:
Downey, JM