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Diabetes:研究指出干扰胰岛β细胞增殖、导致糖尿病的罪魁祸首!

2017-10-20 佚名 medicalxpress

根据Diabetes发表的一项研究,研究人员已经发现通过抑制应激诱导的microRNA-708(miR-708),影响β细胞功能和葡萄糖调节的新机制。

根据Diabetes发表的一项研究,研究人员已经发现通过抑制应激诱导的microRNA-708(miR-708),影响β细胞功能和葡萄糖调节的新机制。

来自西班牙的JúliaRodríguez-Comas及其同事研究了在胰岛中由葡萄糖调节的miRNA。

研究人员发现miR-708是在低葡萄糖浓度下培养的胰岛中最上调的miRNA,其引发强烈的应激反应。通过触发Thapsigargin和ob/ob小鼠胰岛的内质网应激,MiR-708也被有效上调。用化学伴侣4-苯基丁酸酯治疗阻断miR-708的低葡萄糖诱导。在整合分析中,神经元蛋白(Nnat)被鉴定为miR-708的潜在葡萄糖调节靶标。

在不同葡萄糖浓度和ob/ob小鼠的培养胰岛中,Nnat表达与miR-708呈负相关;在miR-708过表达后,该表达降低。MiR-708过度表达受损的葡萄糖刺激的胰岛素分泌(GSIS),其通过Nnat的过表达恢复,与Nnat在β细胞的分泌功能中的作用一致。在低糖培养的胰岛中,miR-708抑制恢复GSIS。miR-708的过表达抑制β-细胞增殖并诱导β细胞凋亡。

作者写道:“为了充分了解这种microRNA表达的变化是否是这些模型中β细胞功能障碍的原因还是需要进一步研究。”

原始出处:

Júlia Rodríguez-Comas, Alba Moreno-Asso, Juan Moreno-Vedia, et.al. Stress-Induced MicroRNA-708 Impairs β-Cell Function and Growth. Diabetes 2017 Sep

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    2018-08-16 baoya
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