The effect of glibenclamide on the production of interstitial adenosine by inhibiting ecto‐5′‐nucleotidase in rat hearts

The effect of glibenclamide on the production of interstitial adenosine by inhibiting ecto‐5′‐nucleotidase in rat hearts
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格列本脲抑制大鼠心脏外切5′-核苷酸酶对间质腺苷产生的影响

DOI:
10.1038/sj.bjp.0701424
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发表时间:
1997
影响因子:
7.3
通讯作者:
M. Arita
M. Arita
中科院分区:
医学2区
文献类型:
--
作者:
Toshiaki Sato;T. Obata;Y. Yamanaka;M. Arita

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腺苷对缺血心肌具有心脏保护作用。缺血心肌中腺苷的产生主要归因于5′-核苷酸酶对腺苷5′-单磷酸腺苷(AMP)的酶解磷酸化。我们测定了大鼠心脏中5′‐核苷酸酶的活性。该研究的目的是通过使用灵活安装的微透析技术,确定ATP敏感的K+ (KATP)通道拮抗剂(格列本脲和5 -羟癸酸酯)对腺苷产生的影响。2大鼠麻醉后,将微透析探针植入左心室心肌,灌注Tyrode溶液。透析液腺苷基线水平为0.51±0.09 μM (n=16)。通过探针引入AMP (100 μM)可使透析液腺苷显著增加至9.79±0.43 μM (n=12, P<0.001),而ecto - 5′‐核苷酸酶抑制剂α,β -亚甲基腺苷5′‐二磷酸(100 μM)可抑制该增加至0.76±0.12 μM (n=8)。因此,在AMP灌注过程中所观察到的透析液腺苷来源于外链5′‐核苷酸酶对AMP的去磷酸化,而透析液中腺苷的水平反映了原位组织中外链5′‐核苷酸酶的活性。3 .格列本脲(0.1 ~ 100 μM)使AMP (100 μM)灌注时腺苷浓度呈浓度依赖性降低(IC50=10.5 μM)。相反,在AMP (100 μM)存在的情况下,5‐羟癸酸(10-100 μM)对透析液腺苷的浓度没有影响。这些结果表明,格列本脲抑制内源性外源性5′核苷酸酶的活性,并降低大鼠心室肌间质内腺苷的浓度。
1 Adenosine exerts cardioprotective effects on the ischaemic myocardium. The production of adenosine in the ischaemic myocardium is attributed primarily to the enzymatic dephosphorylation of adenosine 5′‐monophosphate (AMP) by 5′‐nucleotidase. We determined the activity of 5′‐nucleotidase in rat hearts. The objective of the study was to determine the effects of ATP‐sensitive K+ (KATP) channel antagonists (glibenclamide and 5‐hydroxydecanoate) on the production of adenosine, by use of a flexibly mounted microdialysis technique. 2 Rats were anaesthetized and the microdialysis probe was implanted in the left ventricular myocardium, followed by perfusion with Tyrode solution. The baseline level of dialysate adenosine was 0.51±0.09 μM (n=16). Introduction of AMP (100 μM) through the probe increased the dialysate adenosine markedly to 9.79±0.43 μM (n=12, P<0.001 vs baseline), and this increase was inhibited by the ecto‐5′‐nucleotidase inhibitor, α,β‐methyleneadenosine 5′‐diphosphate (100 μM), to 0.76±0.12 μM (n=8). Thus, the dialysate adenosine noted during the perfusion of AMP originated from dephosphorylation of AMP by ecto‐5′‐nucleotidase, and the dialysate level of adenosine attained reflects the ecto‐5′‐nucleotidase activity in the tissue in situ. 3 Glibenclamide (0.1–100 μM) decreased the adenosine concentration measured during the perfusion of AMP (100 μM) in a concentration‐dependent manner (IC50=10.5 μM). In contrast, 5‐hydroxydecanoate (10–100 μM) did not affect the concentrations of dialysate adenosine, measured in the presence of AMP (100 μM). These results suggest that glibenclamide inhibits the activity of endogenous ecto‐5′‐nucleotidase and decreases the concentration of adenosine in the interstitial space of rat ventricular muscles in situ.
离体大鼠心脏的心脏微透析:缺血期间的间质嘌呤代谢物。
DOI: 10.1152/ajpheart.1992.262.6.h1934
发表时间: 1992
期刊: The American journal of physiology
影响因子: --
作者:
VanWylen,DG;Schmit,TJ;Lasley,RD;Gingell,RL;MentzerJr,RM
通讯作者: MentzerJr,RM
心脏微透析估计间质腺苷和冠状动脉血流量。
DOI: 10.1152/ajpheart.1990.258.6.h1642
发表时间: 1990
期刊: The American journal of physiology
影响因子: --
作者:
VanWylen,DG;Willis,J;Sodhi,J;Weiss,RJ;Lasley,RD;MentzerJr,RM
通讯作者: MentzerJr,RM
大鼠心脏中的 KATP 通道:格列本脲阻断缺血和乙酰胆碱介导的预处理。
DOI: 10.1152/ajpheart.1996.271.1.h23
发表时间: 1996
期刊: The American journal of physiology
影响因子: --
作者:
Qian,YZ;Levasseur,JE;Yoshida,K;Kukreja,RC
通讯作者: Kukreja,RC
DOI: 10.1152/ajpheart.1990.259.3.h820
发表时间: 1990-09-01
影响因子: --
作者:
KIRSCH, GE;CODINA, J;BROWN, AM
通讯作者: BROWN, AM
腺苷在新生羔羊冠状动脉血流调节中的作用。
DOI: --
发表时间: 1985
期刊: Surgery
影响因子: 3.8
作者:
Mainwaring,RD;MentzerJr,RM;Ely,SW;Rubio,R;Berne,RM
通讯作者: Berne,RM