Na+ accumulation increases Ca2+ overload and impairs function in anoxic rat heart.
Na+ accumulation increases Ca2+ overload and impairs function in anoxic rat heart.
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Na 积累会增加 Ca2+ 超载并损害缺氧大鼠心脏的功能。
DOI:
10.1016/0022-2828(90)90972-5
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发表时间:
1990
影响因子:
5
通讯作者:
Neely,JR
中科院分区:
文献类型:
--
作者:
Tani,M;Neely,JR
Maintenance of low coronary flow (1 ml/min) during 40 or 70 min of anoxia maintained function and prevented Ca2+overload during reoxygenation in isolated rat hearts. In comparison, recovery from 40 min of global ischemia resulted in only 20% of preischemic function and an increase in end-diastolic pressure (LVEDP) to 39 mmHg. Reperfusion Ca2+uptake rose from 0.6 to 10.2 μmol/g dry tissue. Intracellular Na+(Nai+) increased from 13 to 61 μmol/g dry tissue after 40 min of global ischemia, but was unchanged in hearts with low flow anoxia. When glucose and pyruvate were omitted from buffer used for anoxic perfusion, recovery was only 15% of preanoxic values, LVEDP rose to 32 mmHg, and reperfusion Ca2+uptake was 7.2 μmol/g dry. In addition,Nai+increased (47.4 μmol/g dry tissue) and ATP was depleted (1.0 μmol/g dry tissue) in the absence of substrate. In anoxic hearts supplied substrate,Nai+stayed low (12 μmol/g dry tissue) and ATP was preserved (11.6 μmol/g dry tissue). Addition of ouabain (100 or 200 μm) and provision of zero-K+buffer increasedNai+and resulted in impaired functional recovery, increased LVEDP, and greater reperfusion Ca2+uptake. These interventions also decreased energy availability in anoxic hearts. To distinguish between effects of Na+accumulation and ATP depletion, monensin, a Na+ionophore, was added during low flow anoxia. Monensin increasedNai+, decreased functional recovery and increased reperfusion Ca2+uptake in a dose-dependent manner (1–10 μm) without changing ATP content. These results suggested that reduction ofNai+accumulation by maintenance of Na+, K+pump activity was the major mechanism of the beneficial effects of low coronary flow on reperfusion injury.
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影响因子:
4.8
作者:
P. Caroni;E. Carafoli
通讯作者:
E. Carafoli
影响因子:
5
作者:
D. Hearse;S. M. Humphrey;G. Bullock
通讯作者:
G. Bullock
DOI:
10.1152/ajpheart.1988.254.6.h1133
发表时间:
1988
期刊:
The American journal of physiology
影响因子:
--
作者:
Murphy,JG;Smith,TW;Marsh,JD
通讯作者:
Marsh,JD
影响因子:
37.8
作者:
C. Apstein;L. Deckelbaum;M. Mueller;L. Hagopian;W. Hood
通讯作者:
W. Hood
DOI:
10.1016/0002-9149(69)90464-0
发表时间:
1969
期刊:
The American journal of cardiology
影响因子:
--
作者:
R. Jennings
通讯作者:
R. Jennings