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
复制标题
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
复制
发表时间:
1997
影响因子:
7.3
通讯作者:
M. Arita
中科院分区:
文献类型:
--
作者:
Toshiaki Sato;T. Obata;Y. Yamanaka;M. Arita
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.
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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
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
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
影响因子:
--
作者:
KIRSCH, GE;CODINA, J;BROWN, AM
通讯作者:
BROWN, AM
影响因子:
3.8
作者:
Mainwaring,RD;MentzerJr,RM;Ely,SW;Rubio,R;Berne,RM
通讯作者:
Berne,RM