Mesenchymal Igf2 is a major paracrine regulator of pancreatic growth and function

Mesenchymal Igf2 is a major paracrine regulator of pancreatic growth and function
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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
Hammerle C
中科院分区:
--
文献类型:
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作者:
Hammerle C

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决定成人胰腺大小的遗传机制还知之甚少。在这里,我们证明了许多印记基因在胰腺间充质中高表达,并探讨了Igf2在体内的作用。间充质特异性的Igf2缺失会导致腺泡和β细胞发育不全,出生后全身生长受限,以及怀孕期间母亲的葡萄糖耐量不足。令人惊讶的是,间充质团没有受到影响,这表明间充质是用于旁分泌信号的IGF2的发育储存库。间充质IGF2的独特作用表现在发育中的胰腺上皮中不存在IGF2缺失的表型。此外,IGF2活性的增加,特别是在间质中,通过Igf2印迹缺失或Igf2r缺失,导致胰腺腺泡过度生长。原代腺泡细胞活体暴露于外源性IGF2,通过AKT信号促进细胞增殖和淀粉酶的产生。我们认为,间充质免疫球蛋白2,可能还有其他印迹基因,是成人胰腺大小和功能的关键发育调节因子。
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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