In vivo screen identifies a SIK inhibitor that induces β cell proliferation through a transient UPR.

In vivo screen identifies a SIK inhibitor that induces β cell proliferation through a transient UPR.
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DOI:
10.1038/s42255-021-00391-x
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发表时间:
2021-05
期刊:
影响因子:
20.8
通讯作者:
Andersson, Olov
Andersson, Olov
中科院分区:
医学1区
文献类型:
--
作者:
Charbord, Jeremie;Ren, Lipeng;Sharma, Rohit B.;Johansson, Anna;Agren, Rasmus;Chu, Lianhe;Tworus, Dominika;Schulz, Nadja;Charbord, Pierre;Stewart, Andrew F.;Wang, Peng;Alonso, Laura C.;Andersson, Olov

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已知β细胞增殖在发育期间和在成人的某些高血糖条件下扩大β细胞群,这是一个可用于糖尿病中β细胞再生的过程。在这里,通过在斑马鱼中使用基于发光泛素化的细胞周期指示剂(LUCCI)的新的高通量筛选,我们将HG-9-91-01鉴定为增殖的驱动因素,并在小鼠和人β细胞中证实了这种作用。HG-9-91-01是一种盐诱导激酶(SIKs)抑制剂,在β细胞中特异性过表达Sik 1可阻断HG-9-91-01对β细胞增殖的作用。小鼠β细胞的单细胞转录组学分析表明,HG-9-91-01在细胞周期进入前诱导了一波激活转录因子(ATF)6依赖性未折叠蛋白反应(UPR)。重要的是,UPR波与胰岛素表达的增加无关。另外的机制研究表明,HG-9-91-01诱导了多种信号传导效应物,包括CRTC 1、CRTC 2、ATF 6、IRE 1和mTOR,它们整合在一起共同驱动β细胞增殖。
It is known that β cell proliferation expands the β cell mass during development and under certain hyperglycemic conditions in the adult, a process that may be used for β cell regeneration in diabetes. Here, through a new high-throughput screen using a luminescence ubiquitination-based cell cycle indicator (LUCCI) in zebrafish, we identify HG-9-91-01 as a driver of proliferation and confirm this effect in mouse and human β cells. HG-9-91-01 is an inhibitor of salt-inducible kinases (SIKs), and overexpression of Sik1 specifically in β cells blocks the effect of HG-9-91-01 on β cell proliferation. Single-cell transcriptomic analyses of mouse β cells demonstrate that HG-9-91-01 induces a wave of activating transcription factor (ATF)6-dependent unfolded protein response (UPR) before cell cycle entry. Importantly, the UPR wave is not associated with an increase in insulin expression. Additional mechanistic studies indicate that HG-9-91-01 induces multiple signalling effectors downstream of SIK inhibition, including CRTC1, CRTC2, ATF6, IRE1 and mTOR, which integrate to collectively drive β cell proliferation.
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