The Drosophila tankyrase regulates Wg signaling depending on the concentration of Daxin.

The Drosophila tankyrase regulates Wg signaling depending on the concentration of Daxin.
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DOI:
10.1016/j.cellsig.2014.04.014
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发表时间:
2014-08
影响因子:
4.8
通讯作者:
Lin X
Lin X
中科院分区:
生物学2区
文献类型:
--
作者:
Feng Y;Li X;Ray L;Song H;Qu J;Lin S;Lin X

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经典Wnt信号通路在发育和稳态中起着关键作用。这一途径的失调可导致许多人类疾病,包括癌症。该途径中的一个关键过程包括通过Axin募集破坏复合物调节β-连环蛋白浓度。以前的研究已经证明了端锚聚合酶(TNKS),一种具有聚(ADP-核糖)聚合酶的蛋白质,在人类癌症中调节Axin水平的作用。然而,跨国知识产权在发展中的作用仍然不清楚。在这里,我们已经产生了一个果蝇端锚聚合酶(DTNKS)突变体,并提供了令人信服的证据表明,DTNKS参与果蝇Axin(Daxin)的降解。我们发现,Daxin与DTNKS物理相互作用,其蛋白水平在没有DTNKS的情况下升高。在S2细胞中,DTNKS抑制Daxin的水平。令人惊讶的是,我们发现,大新反过来下调DTNKS蛋白水平。体内研究表明,DTNKS在高Daxin蛋白水平下调节Wg信号传导和翅图案形成,但在正常水平下不调节。总之,我们的研究结果确定了DTNKS在调节Daxin水平,从而在发育过程中Wg/Wnt信号传导中的保守作用。
The canonical Wnt signaling pathway plays critical roles during development and homeostasis. Dysregulation of this pathway can lead to many human diseases, including cancers. A key process in this pathway consists of regulation of β-catenin concentration through an Axin-recruited destruction complex. Previous studies have demonstrated a role for Tankyrase (TNKS), a protein with poly (ADP-ribose) polymerase, in the regulation of Axin levels in human cancers. However, the role of TNKS in development is still unclear. Here, we have generated a Drosophila tankyrase (DTNKS) mutant and provided compelling evidence that DTNKS is involved in the degradation of Drosophila Axin (Daxin). We show that Daxin physically interacts with DTNKS, and its protein levels are elevated in the absence of DTNKS in eye discs. In S2 cells, DTNKS suppressed the levels of Daxin. Surprisingly, we found that Daxin in turn down-regulated DTNKS protein level. In vivo study showed that DTNKS regulated Wg signaling and wing patterning at a high Daxin protein level, but not at a normal level. Taken together, our findings identified a conserved role of DTNKS in regulating Daxin levels, and thereby Wg/Wnt signaling during development.
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