Mesenchymal Igf2 is a major paracrine regulator of pancreatic growth and function
Mesenchymal Igf2 is a major paracrine regulator of pancreatic growth and function
复制标题
间充质 Igf2 是胰腺生长和功能的主要旁分泌调节剂
DOI:
10.1101/714121
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Hammerle C
中科院分区:
文献类型:
--
作者:
Hammerle C
The genetic mechanisms that determine the size of the adult pancreas are poorly understood. Here we demonstrate that many imprinted genes are highly expressed in the pancreatic mesenchyme, and explore the role ofIgf2 in-vivo. Mesenchyme-specificIgf2deletion results in acinar and beta-cell hypoplasia, postnatal whole-body growth restriction and maternal glucose intolerance during pregnancy. Surprisingly, mesenchymal mass is unaffected, suggesting that the mesenchyme is a developmental reservoir of IGF2 used for paracrine signalling. The unique actions of mesenchymal IGF2 are demonstrated by the absence of phenotypes uponIgf2deletion in the developing pancreatic epithelium. Furthermore, increased IGF2 activity specifically in the mesenchyme, throughIgf2loss-of-imprinting orIgf2rdeletion, leads to pancreatic acinar overgrowth.Ex-vivoexposure of primary acinar cells to exogenous IGF2 increases cell proliferation and amylase production through AKT signalling. We propose that mesenchymalIgf2, and perhaps other imprinted genes, are key developmental regulators of adult pancreas size and function.
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