Effects of inhibitors of eicosanoid synthesis on insulin release by neonatal pancreatic islets.

Effects of inhibitors of eicosanoid synthesis on insulin release by neonatal pancreatic islets.
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类二十烷酸合成抑制剂对新生儿胰岛胰岛素释放的影响。

DOI:
10.1016/0304-4165(84)90206-x
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发表时间:
1984
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
R. Larkins
R. Larkins
中科院分区:
--
文献类型:
--
作者:
M. Dunlop;A. Christanthou;A. Fletcher;M. Veroni;P. Woodman;R. Larkins

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在胰岛中,类二十烷可能来源于花生四烯酸的环加氧酶和脂加氧酶依赖性代谢。这些途径中选择性步骤抑制剂的包含表明,在培养的新生大鼠胰岛中,花生四烯酸可能通过这两种途径代谢,同时由d -葡萄糖、d -甘油醛和2-酮异己酸盐刺激胰岛素释放。这些抑制剂的作用表明,脂氧合酶途径的产物是观察营养物质刺激作用所必需的。与葡萄糖相反,胰岛素释放在环氧合酶抑制剂的存在下被刺激,d -甘油醛、2-酮异己酸酯和蜂毒素的刺激作用仅受这些抑制剂的最小影响,尽管它被脂氧合酶抑制。这些发现支持脂肪加氧酶途径产物在营养诱导的花生四烯酸代谢中的胰岛素分泌中的主要刺激作用,以及环加氧酶途径产物在新生儿胰岛中葡萄糖刺激的胰岛素释放中的负作用或调节作用。
In the pancreatic islet, eicosanoids may arise from both cyclooxygenase- and lipoxygenase-dependent metabolism of arachidonic acid. The inclusion of inhibitors of selective steps in these pathways indicated that in cultured neonatal rat islets, arachinodic acid may be metabolised through both pathways, concurrent with insulin release stimulated byD-glucose,D-glyceraldehyde and 2-ketoisocaproate. The effects of the inhibitors suggested that the products of the lipoxygenase pathway were necessary for the stimulatory effects of nutrients to be observed. In contrast to glucose, where insulin release was stimulated in the presence of inhibitors of cyclooxygenase, the stimulatory action ofD-glyceraldehyde, 2-ketoisocaproate and melittin was only minimally affected by these inhibitors, although it was inhibited by lipoxygenase inhibition. These findings support a major stimulatory role for products of the lipoxygenase pathway of arachidonic acid metabolism in nutrient-induced insulin secretion, and a negative or modulatory role of cyclooxygenase pathway products on glucose-stimulated insulin release in the neonatal islet.
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发表时间: 1983
影响因子: 3.1
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影响因子: 5.8
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