Phosphorylation potential and adenosine release during norepinephrine infusion in guinea pig heart.

Phosphorylation potential and adenosine release during norepinephrine infusion in guinea pig heart.
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豚鼠心脏去甲肾上腺素输注过程中的磷酸化电位和腺苷释放。

DOI:
10.1152/ajpheart.1987.253.5.h1184
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发表时间:
1987
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Sparks,HV
Sparks,HV
中科院分区:
--
文献类型:
--
作者:
He,MX;Wangler,RD;Dillon,PF;Romig,GD;Sparks,HV

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本研究检验了以下假设:离体豚鼠心脏 (n = 5) 响应去甲肾上腺素释放的腺苷与细胞磷酸化电位 (PP; [ATP]/[ADP][Pi]) 相关,其中 Pi 是无机磷酸盐。 31P-核磁共振(NMR)用于测量Pi、磷酸肌酸(PCr)和ATP的相对浓度。用含有 0.1 mM Pi 的生理盐溶液对心脏进行 Langendorff 灌注。收集静脉流出物用于测量腺苷和氧分压(PO2)。控制期后,输注去甲肾上腺素(6 X 10(-8) M)20分钟,在此期间每分钟收集31P-NMR谱和静脉流出物样品。输注去甲肾上腺素后,PCr 在 8 分钟内迅速下降至对照的 72%(P 小于 0.05),然后在剩余 12 分钟内恢复至对照的 80%。 20 分钟内 ATP 缓慢下降至对照的 70%(P 小于 0.01)。 Pi 在 2 分钟时增加至峰值(P 小于 0.01),然后在 8 至 20 分钟内缓慢下降至稳定状态(峰值的 60% 和对照的 3.5 倍)。腺苷释放在 7 分钟时从 11 +/- 6 增加到峰值 250 +/- 68 pmol.min-1.g-1(P 小于 0.01),然后从 10 到 20 分钟缓慢下降(P 小于 0.05)至约 110 pmol.min-1.g-1 的稳定状态(相对于对照,P 小于 0.01)。(摘要截断于250 字)
This study tested the hypothesis that adenosine released from isolated guinea pig hearts (n = 5) in response to norepinephrine is related to the cellular phosphorylation potential (PP; [ATP]/[ADP][Pi]), where Pi is inorganic phosphate. 31P-nuclear magnetic resonance (NMR) was used to measure the relative concentrations of Pi, phosphocreatine (PCr), and ATP. Hearts were Langendorff perfused with a physiological salt solution containing 0.1 mM Pi. The venous effluent was collected for measurement of adenosine and partial pressure of oxygen (PO2). After a control period, norepinephrine (6 X 10(-8) M) was infused for 20 min during which 31P-NMR spectra and samples of venous effluent were collected every minute. With norepinephrine infusion, PCr decreased rapidly to 72% of control (P less than 0.05) by 8 min and then recovered to 80% of control for the remaining 12 min. ATP fell slowly to 70% of control (P less than 0.01) over 20 min. Pi increased to a peak at 2 min (P less than 0.01), then declined slowly to a steady state (60% of the peak and 3.5 X control) from 8 to 20 min. Adenosine release increased from 11 +/- 6 to a peak of 250 +/- 68 pmol.min-1.g-1 (P less than 0.01) at 7 min and then slowly fell (P less than 0.05) to a steady state of approximately 110 pmol.min-1.g-1 (P less than 0.01 vs. control) from 10 to 20 min.(ABSTRACT TRUNCATED AT 250 WORDS)
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