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首页> 外文期刊>The international journal of biochemistry and cell biology >From insulin synthesis to secretion: Alternative splicing of type 2 ryanodine receptor gene is essential for insulin secretion in pancreatic beta cells
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From insulin synthesis to secretion: Alternative splicing of type 2 ryanodine receptor gene is essential for insulin secretion in pancreatic beta cells

机译:从胰岛素合成分泌:2型ryanodine受体基因的替代剪接对于胰腺β细胞中的胰岛素分泌是必不可少的

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摘要

Increases in the intracellular Ca2+ concentration in pancreatic islets, resulting from the Ca2+ mobilization from the intracellular source through the ryanodine receptor, are essential for insulin secretion by glucose. Cyclic ADP-ribose, a potent Ca2+ mobilizing second messenger synthesized from NAD by CD38, regulates the opening of ryanodine receptor. A novel ryanodine receptor mRNA (the islet-type ryanodine receptor) was found to be generated from the type 2 ryanodine receptor gene by the alternative splicing of exons 4 and 75. The islet-type ryanodine receptor mRNA is expressed in a variety of tissues such as pancreatic islets, cerebrum, cerebellum, and other neuro-endocrine cells, whereas the authentic type 2 ryanodine receptor mRNA (the heart-type ryanodine receptor) was found to be generated using GG/AG splicing of intron 75 and is expressed in the heart and the blood vessel. The islet-type ryanodine receptor caused a greater increase in the Ca2+ release by caffeine when expressed in HEK293 cells pre-treated with cyclic ADP-ribose, suggesting that the novel ryanodine receptor is an intracellular target for the CD38-cyclic ADP-ribose signal system in mammalian cells and that the tissue-specific alternative splicing of type 2 ryanodine receptor mRNA plays an important role in the functioning of the cyclic ADP-ribose-sensitive Ca2+ release.
机译:在胰岛中的细胞内Ca2 +浓度增加,由Ca2 +从细胞内源通过ryanodine受体的动员导致,对葡萄糖的胰岛素分泌至关重要。循环ADP-核糖,有效的CA2 +通过CD38从NAD合成的第二信使调节ryanodine受体的开口。发现一种新的卤代氨基受体mRNA(胰岛型雷马丁籽受体)通过替代外显子4和75的替代剪接从2型瑞那氨基受体基因产生。胰岛型ryanodine受体mRNA在各种组织中表达作为胰岛,大脑,小脑和其他神经内分泌细胞,而使用Intron 75的GG / Ag剪接发现真实的2型ryanodine受体mRNA(心型卤代氨基受体)并在心脏中表达和血管。在用环状ADP-核糖预处理的HEK293细胞中表达时,胰岛型ryanodine受体通过咖啡因引起Ca2 +释放增加,表明新的卤代胺受体是CD38-环状ADP-核糖信号系统的细胞内靶标在哺乳动物细胞中,2型ryanodine受体mRNA的组织特异性替代剪接在循环ADP-核糖敏感CA2 +释放的功能中起重要作用。

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