Pancreatic α-cell specific deletion of mouse Arx leads to α-cell identity loss.

Pancreatic α-cell specific deletion of mouse Arx leads to α-cell identity loss.
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小鼠ARX的胰腺α细胞特异性缺失会导致α细胞的身份丧失。

DOI:
10.1371/journal.pone.0066214
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
May CL
May CL
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wilcox CL;Terry NA;Walp ER;Lee RA;May CL

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胰腺内分泌细胞群(α-、β-、δ、PP-和ε-细胞)的特化和分化由转录调节因子的组合协调。在胰腺中,Aristaless-related homeobox基因(Arx)首先在内分泌祖细胞中表达,然后仅限于产生胰高血糖素的α细胞。虽然Arx在早期α-细胞特化中的功能需求已被研究,但其在维持α-细胞特性中的作用尚未被探索。为了研究Arx的这种后期作用,我们已经产生了Arx基因在产生胰高血糖素的α细胞中被特异性消除的小鼠。内分泌激素的谱系追踪研究和免疫染色分析表明,新生儿α细胞中Arx的消融导致通过中间双激素状态的α至β样转化。此外,这些Arx缺陷型转化细胞表达β细胞标志物,包括Pdx 1、MafA和Glut 2。令人惊讶的是,成年小鼠中Arx的短期消融不会导致类似的α至β样转化。总之,这些发现揭示了Arx在维持α细胞身份方面的潜在时间要求。
The specification and differentiation of pancreatic endocrine cell populations (α-, β-, δ, PP- and ε-cells) is orchestrated by a combination of transcriptional regulators. In the pancreas, Aristaless-related homeobox gene (Arx) is expressed first in the endocrine progenitors and then restricted to glucagon-producing α-cells. While the functional requirement of Arx in early α-cell specification has been investigated, its role in maintaining α-cell identity has yet to be explored. To study this later role of Arx, we have generated mice in which the Arx gene has been ablated specifically in glucagon-producing α-cells. Lineage-tracing studies and immunostaining analysis for endocrine hormones demonstrate that ablation of Arx in neonatal α-cells results in an α-to-β-like conversion through an intermediate bihormonal state. Furthermore, these Arx-deficient converted cells express β-cell markers including Pdx1, MafA, and Glut2. Surprisingly, short-term ablation of Arx in adult mice does not result in a similar α-to-β-like conversion. Taken together, these findings reveal a potential temporal requirement for Arx in maintaining α-cell identity.
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