Cdc42/N-WASP signaling links actin dynamics to pancreatic β cell delamination and differentiation
Cdc42/N-WASP signaling links actin dynamics to pancreatic β cell delamination and differentiation
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DOI：
10.1242/dev.100297
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发表时间：
2014-02-01
期刊：
影响因子：
4.6
通讯作者：
Semb, Henrik
中科院分区：
文献类型：
--
作者：
Kesavan, Gokul;Lieven, Oliver;Semb, Henrik
Delamination plays a pivotal role during normal development and cancer. Previous work has demonstrated that delamination and epithelial cell movement within the plane of an epithelium are associated with a change in cellular phenotype. However, how this positional change is linked to differentiation remains unknown. Using the developing mouse pancreas as a model system, we show that beta cell delamination and differentiation are two independent events, which are controlled by Cdc42/N-WASP signaling. Specifically, we show that expression of constitutively active Cdc42 in beta cells inhibits beta cell delamination and differentiation. These processes are normally associated with junctional actin and cell-cell junction disassembly and the expression of fate-determining transcription factors, such as Isl1 and MafA. Mechanistically, we demonstrate that genetic ablation of N-WASP in beta cells expressing constitutively active Cdc42 partially restores both delamination and beta cell differentiation. These findings elucidate how junctional actin dynamics via Cdc42/N-WASP signaling cell-autonomously control not only epithelial delamination but also cell differentiation during mammalian organogenesis.
