Ethylisopropylamiloride diminishes changes in intracellular Na, Ca and pH in ischemic newborn myocardium.
Ethylisopropylamiloride diminishes changes in intracellular Na, Ca and pH in ischemic newborn myocardium.
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乙基异丙基阿米洛利可减少缺血新生儿心肌细胞内 Na、Ca 和 pH 值的变化。
DOI:
10.1006/jmcc.1997.0442
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发表时间:
1997
影响因子:
5
通讯作者:
Anderson,SE
中科院分区:
文献类型:
--
作者:
Liu,H;Cala,PM;Anderson,SE
Numerous studies suggest that in adult hearts myocardial ischemic injury is in part the result of proton stimulation of Na/H exchange which increases intracellular Na (Nai) and thus leads to increases in intracellular Ca concentration ( [Ca]i) due to changes in Na/Ca exchange flux. Corollary to the hypothesis, inhibition of Na/H exchange diminishes Na and Ca accumulation and improves heart function after ischemia. To test this hypothesis and its corollary in newborn hearts, NMR spectroscopy was used to measure intracellular pH (pHi), Nai, [Ca]i, and high energy phosphates in isolated, 4–7-day-old rabbit hearts, Langendorff-perfused with Krebs–Henseleit solution at pH 7.4±0.5 equilibrated with 95% O2/5% CO2at 36±1°C. Control hearts were perfused for 30 min before initiating 40 min of global ischemia followed by 40 min of reperfusion. In a second group of hearts ethylisopropylamiloride (EIPA–10μm) was added to the perfusate 20 min before global ischemia to inhibit Na/H exchange. After 15 min ischemia, pHiin EIPA-treated hearts (6.41±0.04) was higher than that of the control hearts (6.20±0.08;P<0.05). EIPA also limited the increase in Naiand [Ca]iduring ischemia and improved Naiand [Ca]irecovery during reperfusion (P<0.05). Nai(mEq/kg dry weight) rose from 18.1±3.2 to 110.6±14.0 and recovered to 53.3±12.3 in the control group. The corresponding Naivalues for EIPA-treated hearts were 16.2±2.4, 39.6±9.6 and 12.6±3.5, respectively. In control hearts [Ca]i(nm/l) rose from 332±42 to 1157±89 and recovered to 842±55, whereas in EIPA-treated hearts the values were 255±32, 616±69 and 298±34, respectively. EIPA also preserved cellular ATP during ischemia and reperfusion and diminished inorganic phosphate during reperfusion (P<0.05). Finally, EIPA treatment improved recovery of left ventricular developed pressure (68.2±8.9v16.2±3.6% of control) and limited myocardial injury as indicated by decreased total creatine kinase release during reperfusion (348±132v2432±639 IU/g dry weight). Thus, as in adults, the results from newborn hearts are consistent with the hypothesis.
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DOI:
--
发表时间:
1986
期刊:
Blood cells
影响因子:
--
作者:
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通讯作者:
Dent,G
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1980
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作者:
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1978
期刊:
Journal of the Reticuloendothelial Society
影响因子:
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作者:
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通讯作者:
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发表时间:
1974
期刊:
Laboratory investigation; a journal of technical methods and pathology
影响因子:
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作者:
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通讯作者:
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DOI:
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发表时间:
1986
期刊:
The Lancet
影响因子:
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作者:
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