Pre-existing beta cells but not progenitors contribute to new beta cells in the adult pancreas.

Pre-existing beta cells but not progenitors contribute to new beta cells in the adult pancreas.
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预先存在的β细胞而不是祖细胞有助于成年胰腺中的新β细胞。

DOI:
10.1038/s42255-021-00364-0
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发表时间:
2021-03
期刊:
影响因子:
20.8
通讯作者:
Zhou B
Zhou B
中科院分区:
医学1区
文献类型:
--
作者:
Zhao H;Huang X;Liu Z;Pu W;Lv Z;He L;Li Y;Zhou Q;Lui KO;Zhou B

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已经提出,新的辟田胞可以产生于成年胰腺祖细胞或兼性干细胞的特定群体。然而,它们的存在仍然存在争议,并且它们促进新β细胞形成的条件尚不清楚。在这里,我们使用一套小鼠模型,使双重组酶介导的遗传追踪,同时命运映射胰岛素+和胰岛素−细胞在成人胰腺。我们发现,在稳态、妊娠或损伤(包括部分胰腺切除术、胰管结扎或链脲佐菌素β细胞消融术)期间,内分泌和外分泌来源的胰岛素-细胞不会在成人胰腺中产生新的β细胞。然而,非β细胞在β细胞的极端遗传消融后可产生胰岛素+细胞,与转分化一致。总之,我们的数据表明,在生理条件下,胰腺内分泌和外分泌祖细胞对成年小鼠胰腺中新β细胞的形成没有贡献。
It has been suggested that new β cells can arise from specific populations of adult pancreatic progenitors or facultative stem cells. However, their existence remains controversial, and the conditions under which they would contribute to new β cell formation are not clear. Here, we use a suite of mouse models enabling dual recombinases-mediated genetic tracing to simultaneously fate map insulin+ and insulin− cells in the adult pancreas. We find that the insulin− cells, of both endocrine and exocrine origin, do not generate new β cells in the adult pancreas during homeostasis, pregnancy or injury, including partial pancreatectomy, pancreatic duct ligation or β cell ablation with streptozotocin. However, non-β cells can give rise to insulin+ cells after extreme genetic ablation of β cells, consistent with transdifferentiation. Together, our data indicate that pancreatic endocrine and exocrine progenitor cells do not contribute to new β cell formation in the adult mouse pancreas under physiological conditions.
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