Cell Metab:科学家找到了引起糖尿病的“根源”

2017-04-07 佚名 medicalxpress

【分泌胰岛素的细胞也会衰老?】有一个问题困扰了糖尿病研究专家几十年之久,那就是为什么一个胰岛上的负责产生胰岛素的β细胞与它们的相对物以及附近小岛上的β细胞在外观和行为上都不相同。乔斯林糖尿病中心科学家使用发现细胞衰老的标志,发现这种多样性是由β细胞群的年龄不同决定的。

科学家们早就知道,β细胞会随着年龄的增长而变化,早在2011年的试验中,就已经表明,未成年的β细胞与成年之后的β细胞基因表达和功能都不同。

在此次试验中,研究人员发现不同年龄段小鼠β细胞基因表达的戏剧性差异。科学家确定了β细胞老化的几个标记,其中包括一个叫做IGF1R的蛋白质,它是维持细胞生存的重要角色。

研究人员表示:“在此次研究中,我们发现了β细胞的多样性,在年幼的小鼠体内,β细胞本应还为发育成熟,但是我们依然可以找到马上进入生命终点的细胞。这些细胞的差异可能反映了寿命的问题。”

在进一步的研究中,科学家发现两个衰老标记物在2型糖尿病患者体内显着增加。接下来,研究人员将会继续研究,希望确定影响β细胞老化的因素究竟是什么,老化是否是可以逆转的,从而解决代谢引起的各类疾病,如2型糖尿病。除此之外,此次研究还有助于解答困扰科学界很久的1型糖尿病谜题,如为什么有些细胞更加抗拒自身免疫攻击等。

原始出处:

Aguayo-Mazzucato C,van Haaren M,Mruk M,et al.β Cell Aging Markers Have Heterogeneous Distribution and Are Induced by Insulin Resistance.Cell Metab.

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    2018-03-15 维他命
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    2017-09-23 guojianrong
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    2017-10-06 一闲
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    2017-04-07 天涯183

    非常好的研究学习了

    0

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