Diabetologia:ERK1在小鼠胰腺β细胞中功能如何?

2017-10-29 MedSci MedSci原创

胰腺β细胞胰岛素分泌不足与β细胞量减少有关,同时也是2型糖尿病的特征。尽管对ERK1和ERK2是否起着不同的作用仍然未知,但是之前报道β细胞中的细胞外信号相关激酶1和2(ERK1 / 2)抑制作用可影响胰岛素分泌,基因转录和存活。本研究的目的是使用ERK1(也称为Mapk3)-敲除小鼠(Erk1 - / -小鼠)和药理学方法评估ERK1和ERK2在β细胞中的作用。近日,国际杂志 《Diabetol

胰腺β细胞胰岛素分泌不足与β细胞量减少有关,同时也是2糖尿病的特征。尽管对ERK1ERK2是否起着不同的作用仍然未知,但是之前报道β细胞中的细胞外信号相关激酶12ERK1 / 2)抑制作用可影响胰岛素分泌,基因转录和存活。本研究的目的是使用ERK1(也称为Mapk3-敲除小鼠(Erk1 - / -小鼠)和药理学方法评估ERK1ERK2在β细胞中的作用。近日,国际杂志 《Diabetologia》上在线发表一项关于ERK1对小鼠胰腺beta细胞功能的研究。

研究人员在胰岛中测定NADPH,游离胞质Ca 2+浓度和胰岛素分泌。使用全内反射荧光显微镜监测ERK1ERK2亚基异位移位和活性。通过蛋白质印迹和/免疫细胞化学来评估ERK1 / 2,促分裂原和应激激活的激酶1MSK1)和cAMP反应性元件结合蛋白(CREB)活化,并从胰腺切片测定胰岛质量。

研究发现葡萄糖了一诱导ERK1ERK2亚水平的快速募集。当同时抑制ERK1ERK2时,葡萄糖诱导的胰岛素分泌的第一阶段的快速瞬时峰值降低了40%(p  <0.01),尽管ERK1似乎没有参与该过程。相比之下,ERK1是葡萄糖诱导的完全激活涉及β细胞存活的几个靶标所必需的; 与Erk1 + / +小鼠β细胞相比,Erk1 - / -小鼠β细胞的MSK1CREB活性较低(p <0.01),ERK1被重新表达且ERK2过表达后,磷酸化才能恢复。最后,Erk1 - / -小鼠的胰岛质量在小鼠(4月龄小鼠)与Erk1 + / +小鼠(胰岛占据的平均值±SEM )上略有增加:0.74%±0.03%比0.62% ±0.04; p  <0.05),而老年小鼠(10个月大)不易发生年龄相关性胰腺胰岛炎(浸润胰岛[平均值±SEM]7.51%±1.34vs 2.03%±0.51; p  <0.001)。

研究表明,ERK1ERK2在β细胞中起特殊作用。ERK2不能总是补偿ERK1的缺乏,但在Erk1 - / -小鼠中没有明确的表型表明ERK1在正常条件下是不必要的。

原始出处:

Michele Leduc, Joy Richard, Safia Costes,et al. ERK1 is dispensable for mouse pancreatic beta cell function but is necessary for glucose-induced full activation of MSK1 and CREB.

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    2017-10-29 惠映实验室

    学习了谢谢.

    0