Phospholipase D signaling in ischemic heart.
Phospholipase D signaling in ischemic heart.
复制标题
缺血心脏中的磷脂酶 D 信号传导。
DOI:
10.1016/0925-4439(92)90094-4
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发表时间:
1992
期刊:
影响因子:
--
通讯作者:
Das,DK
中科院分区:
文献类型:
--
作者:
Moraru,II;Popescu,LM;Maulik,N;Liu,X;Das,DK
Phospholipase D (PLD) activity was found to be present in the membrane fraction of rat myocardial cells by in vitro assays (36.7 ± 4.1 nmol/mg protein per h against 1-palmitoyl-2-arachidonoyl-phosphatidylcholine) and demonstrated in intact cells by the specific transphosphatidylation reaction (in the presence of 0.02% ethanol) quantitated usingn-[1-14C]butanol (201.16 ± 7.1 pmol/min per g dry weight in the whole heart). Both methods showed a significant increase in PLD activity (by 62 and 44%, respectively) in hearts subjected to reversible (30 min) global normothermic ischemia followed by reperfusion (30 min). In hearts prelabeled with [1-14C]arachidonic acid, ischemia/reperfusion induced a significant increase in the amount of radiolabel incorporated into phosphatidic acid (PtdOH) (by 49.6%) and diacylglycerol (DG) (by 259%). DG kinase inhibition by 100 μM dioctanoylethylene glycol did not affect the ischemia/reperfusion DG and PtdOH levels while PtdOH phosphohydrolase inhibition with 40 μM propranolol produced a further increase in PtdOH (to 2.36-fold the baseline level) and a reduction in DG (to only 145% over the baseline levels). Put together, all these results suggest an activation of PLD during myocardial ischemia/reperfusion generating intracellular PtdOH, part of which is converted by PtdOH phosphohydrolas to DG. We further investigated the possible pathophysiological significance of the observed PLD activation. Stimulation of PLD with sodium oleate (20 μM) induced a significant improvement of functional recovery of ischemic hearts during reperfusion (as monitored by coronary flow and left intraventricular pressure measurements) and an attenuation of cellular injury as expressed by lactate dehydrogenase and creatine kinase release in the coronary effluent during reperfusion. These results suggest a PLD-mediated signaling in the ischemic heart which may benefit functional recovery during reperfusion.
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DOI:
--
发表时间:
1989
期刊:
Biochemical and Biophysical Research Communications - BBRC
影响因子:
--
作者:
J. Anthes;S. Eckel;M. Siegel;R. Egan;M. Billah
通讯作者:
M. Billah
影响因子:
3.9
作者:
Shukla,SD;Hanahan,DJ
通讯作者:
Hanahan,DJ
DOI:
10.1016/0006-291x(80)90818-9
发表时间:
1980
影响因子:
3.1
作者:
C. Limas
通讯作者:
C. Limas
DOI:
10.1016/s0021-9258(18)48176-8
发表时间:
1987-11
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
S. Bocckino;P. Blackmore;P. Wilson;J. Exton
通讯作者:
S. Bocckino;P. Blackmore;P. Wilson;J. Exton
影响因子:
4.7
作者:
KOBAYASHI, M;KANFER, JN
通讯作者:
KANFER, JN