Repression of MAP3K1 expression and JNK activity by canonical Wnt signaling.

Repression of MAP3K1 expression and JNK activity by canonical Wnt signaling.
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DOI:
10.1016/j.ydbio.2018.05.008
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发表时间:
2018-08-15
影响因子:
2.7
通讯作者:
Xia Y
Xia Y
中科院分区:
生物学3区
文献类型:
--
作者:
Meng Q;Mongan M;Wang J;Xia Y

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形态发生是一个复杂的、高度协调的过程,由发育途径的时间、空间活动来协调。不同的途径如何相互作用来指导发展计划仍然是一个耐人寻味的开放问题。MAP3K1-JNK和Wnt是胚胎眼睑闭合的关键信号通路,是哺乳动物保守的一种上皮形态发生事件。在这里,我们使用了眼皮发育的小鼠模型以及遗传和生物化学工具来研究这两条途径之间的关系。我们发现Wnt的激活抑制了MAP3K1的表达。利用Axin-LacZ报告小鼠,在发育中的眼睑前缘检测到空间Wnt活性。眼表外胚层条件性敲除WLS抑制了眼睑的形成,并显著增加了MAP3K1在鼻斜角区眼睑细胞中的表达。相反,编码典型的Wnt拮抗剂的Dkk2的敲除导致靠近鼻角的上眼睑边缘细胞中Wnt活性的增加。在Dkk2基因敲除的胚胎中,Wnt信号的上调对应于MAP3K1的表达下调。体外数据显示,Wnt3a处理降低了MAP3K1启动子的活性,而氯化锂激活Wnt抑制了MAP3K1的表达,并减弱了MAP3K1介导的JNK活性。我们的数据证实了Wnt信号和MAP3K1-JNK通路在上皮形态发生中存在独特的信号串扰。
Morphogenesis is a complex and highly coordinated process orchestrated by temporal spatial activity of developmental pathways. How the different pathways interact to guide the developmental program remains an intriguing and open question. MAP3K1-JNK and Wnt are signaling pathways crucial for embryonic eyelid closure, an epithelial morphogenetic event conserved in mammals. Here we used a mouse model of eyelid development and genetic and biochemistry tools to investigate the relationships between the two pathways. We found that Wnt activation repressed MAP3K1 expression. Using Axin-LacZ reporter mice, spatial Wnt activity was detected in the leading edge of the developing eyelid. Conditional knockout of Wntless (Wls) in ocular surface ectoderm blocked eyelid formation, and significantly increased MAP3K1 expression in eyelid cells at the nasal canthus region. Conversely, knockout of Dkk2, encoding a canonical Wnt antagonist, resulted in an increase of Wnt activity in cells at the upper eyelid margin near the nasal canthus. Up-regulation of Wnt signaling in the Dkk2-knockout embryos corresponded to down-regulation of MAP3K1 expression. In vitro data showed that Wnt3a treatment decreased MAP3K1 promoter activity, whereas activation of Wnt by lithium chloride inhibited MAP3K1 expression, and attenuated MAP3K1-mediated JNK activity. Our data identify a unique signal crosstalk between Wnt signaling and the MAP3K1-JNK pathway in epithelial morphogenesis.
在哺乳动物组织形态发生中,细胞嵌入产生的力牵引表皮片。
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