Pancreatic islet-autonomous insulin and smoothened-mediated signalling modulate identity changes of glucagon(+) α-cells.

Pancreatic islet-autonomous insulin and smoothened-mediated signalling modulate identity changes of glucagon(+) α-cells.
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DOI:
10.1038/s41556-018-0216-y
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发表时间:
2018-11
影响因子:
21.3
通讯作者:
Herrera PL
Herrera PL
中科院分区:
生物学1区
文献类型:
--
作者:
Cigliola V;Ghila L;Thorel F;van Gurp L;Baronnier D;Oropeza D;Gupta S;Miyatsuka T;Kaneto H;Magnuson MA;Osipovich AB;Sander M;Wright CEV;Thomas MK;Furuyama K;Chera S;Herrera PL

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在高等脊椎动物中,限制再生和维持细胞特性的机制在高等脊椎动物中很难描述。当β细胞丢失时,1-2%的产生胰高血糖素的α细胞自发地参与小鼠胰岛素的产生。在这里,我们探讨了抑制α细胞可塑性的机制。我们发现,适应性α细胞特性的改变受到胰岛内胰岛素和平滑调节信号等的限制。β细胞缺失或胰岛素信号抑制与α或δ细胞中平滑失活相结合,刺激更多α细胞中胰岛素的产生。这些发现表明,消除结构性的“刹车信号”对于中和对适应性细胞命运变化的抵抗力至关重要。细胞身份的维持似乎是一个由邻近细胞释放的抑制性信号介导的主动过程,抑制了分化细胞的内在变化趋势。
The mechanisms restricting regeneration and maintaining cell identity following injury are poorly characterized in higher vertebrates. Upon β-cell loss, 1–2% of the glucagon-producing α-cells spontaneously engage in insulin production in mice. Here we explore the mechanisms inhibiting α-cell plasticity. We show that the adaptive α-cell identity changes are constrained by intra-islet Insulin- and Smoothened-mediated signaling, among others. The combination of β-cell loss, or insulin signaling inhibition, with Smoothened inactivation in α- or δ-cells, stimulates insulin production in more α-cells. These findings suggest that removing constitutive “brake signals” is crucial for neutralizing the refractoriness to adaptive cell-fate changes. It appears that cell identity maintenance is an active process mediated by repressive signals, released by neighbor cells, curbing an intrinsic trend of differentiated cells to change.
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