Cysteinyl leukotrienes mediate the response of submucosal ganglia from rat colon to bradykinin.

Cysteinyl leukotrienes mediate the response of submucosal ganglia from rat colon to bradykinin.
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半胱氨酰白三烯介导大鼠结肠粘膜下神经节对缓激肽的反应

DOI:
10.1016/j.ejphar.2012.02.001
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发表时间:
2012
影响因子:
5
通讯作者:
Diener M
Diener M
中科院分区:
医学2区
文献类型:
--
作者:
Rehn M;Diener M

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本研究的目的是找出炎症介质缓激肽(bradykinin)诱导肠神经元胞质Ca2+浓度([Ca2+]i)增加的机制。为此,从大鼠结肠分离的粘膜下层的神经节装载Ca2+敏感染料fura-2,并暴露于缓激肽(2·10−8mol/l)。在对照条件下,激肽引起了[Ca2+]i的短暂增加。用醌或花生四烯基三氟甲基酮(AACOCF3),即胞质磷脂酶A2的阻滞剂,预孵育可阻止[Ca2+]i的升高。这种抑制作用被5,8,11,14- eicosatatayonic acid(一种环氧合酶和脂氧合酶抑制剂)和BWA4C(一种脂氧合酶选择性抑制剂)模拟,而吲哚美辛无效,表明脂氧合酶代谢物介导激肽反应。事实上,一种白三烯,白三烯D4(LTD4),模仿了缓激素的作用。ltd4受体阻滞剂MK-571抑制ltd4和缓激素引起的[Ca2+]的增加。因此,大鼠结肠粘膜下神经节中的缓激肽受体与磷脂酶A2的刺激、花生四烯酸的释放和LTD4的产生耦合,这似乎最终导致了细胞质Ca2+浓度的变化。
The aim of the present study was to find out the mechanism by which the inflammatory mediator, bradykinin, induces an increase of the cytosolic Ca2+concentration ([Ca2+]i) in enteric neurons. For this purpose, ganglia in the isolated submucosa from rat colon were loaded with the Ca2+-sensitive dye, fura-2, and were exposed to bradykinin (2·10−8mol/l). Under control conditions, the kinin evoked a transient increase in [Ca2+]i. Preincubation with quinacrine or arachidonyltrifluoromethylketone (AACOCF3), i.e. blockers of cytosolic phospholipase A2, prevented the raise of [Ca2+]i. This inhibition was mimicked by 5,8,11,14-eicosatetrayonic acid (ETYA), an inhibitor of cyclooxygenases as well as lipoxygenases, and by BWA4C, a selective inhibitor of lipoxygenases, whereas indomethacin was ineffective, suggesting the mediation of the kinin response by a lipoxygenase metabolite. Indeed, a leukotriene, leukotriene D4(LTD4), mimicked the effect of bradykinin. The LTD4receptor blocker, MK-571, inhibited the increase in [Ca2+]ievoked by LTD4and by bradykinin. Consequently, bradykinin receptors in submucosal ganglia from rat colon are coupled to a stimulation of phospholipase A2, the release of arachidonic acid and the production of LTD4, which seems to be finally responsible for the change in the cytosolic Ca2+concentration.
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