Tyrosine phosphorylation of phosphatidylinositol 3-kinase and of the thromboxane A2 (TXA2) receptor by the TXA2 mimetic I-BOP in A7r5 cells.
Tyrosine phosphorylation of phosphatidylinositol 3-kinase and of the thromboxane A2 (TXA2) receptor by the TXA2 mimetic I-BOP in A7r5 cells.
复制标题
A7r5 细胞中 TXA2 模拟 I-BOP 对磷脂酰肌醇 3-激酶和血栓素 A2 (TXA2) 受体的酪氨酸磷酸化。
DOI:
10.1016/s0006-2952(97)00005-1
复制
发表时间:
1997
影响因子:
5.8
通讯作者:
Ullian,ME
中科院分区:
文献类型:
--
作者:
Morinelli,TA;Finley,EL;Jaffa,AA;Kurtz,DT;Ullian,ME
Thromboxane A2(TXA2) interacts with its G-protein coupled receptor, the TP receptor, to produce contraction and proliferation of vascular smooth muscle cells. We have shown previously that proliferation of primary cultures of vascular smooth muscle cells initiated by [1S-(1α, 2β(5 Z ), 3α(1E, 3R), 4α]-7-[3-(3- hydroxy -4-(4 t ́ - iodophenoxy )-1- butenyl )-7- oxabicyclo -[2.2.1] heptan -2 yl ]-5′- heptenoic acid (I-BOP), a stable TXA2mimetic, is mediated by activation of mitogen-activated protein (MAP) kinase. In the present study, we examined further the intracellular mediators involved in TXA2activation of vascular smooth muscle cells. Transient transfection of the cDNA for the TP receptor into A7r5 vascular smooth muscle cells resulted in expression of TP receptors with a receptor density, Bmax, of 0.7 ± 0.2 pmol/mg protein and a receptor affinity, Kd, of 0.6 ± 0.1 nM (N = 7). Mock transfected cells lacked significant receptor expression. In TP receptor transfected cells, I-BOP increased the activation of MAP kinase 2-fold, stimulated tyrosine phosphorylation of cellular proteins of relative molecular mass (Mr) of 140, 85, 60, 56, and 45 kDa, and increased the message for c-jun, a nuclear transcription factor involved in mitogenesis, 2.6-fold. Immunoblot analysis indicated that the 85-kDa protein represented phosphoinositide 3-kinase (PI3-K), while the 60 kDa protein was the TP receptor. The activity of PI3-K was increased 3.5-fold by the addition of I-BOP (0.1 μM). In summary, the present study demonstrated that stimulation of the TP receptor results in tyrosine phosphorylation of the receptor and of PI3-K.
登录
查看更多内容
DOI:
10.1146/annurev.pa.29.040189.001241
发表时间:
1989
影响因子:
12.5
作者:
Halushka,PV;Mais,DE;Mayeux,PR;Morinelli,TA
通讯作者:
Morinelli,TA
DOI:
--
发表时间:
1994
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Sung,CK;Sánchez-Margalet,V;Goldfine,ID
通讯作者:
Goldfine,ID
DOI:
--
发表时间:
1994
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Goldman,PS;Nathanson,NM
通讯作者:
Nathanson,NM
DOI:
--
发表时间:
1989
期刊:
The Journal of pharmacology and experimental therapeutics
影响因子:
--
作者:
Morinelli,TA;OatisJr,JE;Okwu,AK;Mais,DE;Mayeux,PR;Masuda,A;Knapp,DR;Halushka,PV
通讯作者:
Halushka,PV
DOI:
--
发表时间:
1996-05
期刊:
The Journal of pharmacology and experimental therapeutics
影响因子:
--
作者:
C. J. Allan;K. Higashiura;M. Martin;T. Morinelli;D. T. Kurtz;O. Geoffroy;G. Meier;T. Gettys;P. Halushka
通讯作者:
C. J. Allan;K. Higashiura;M. Martin;T. Morinelli;D. T. Kurtz;O. Geoffroy;G. Meier;T. Gettys;P. Halushka