SNX3 controls Wingless/Wnt secretion through regulating retromer-dependent recycling of Wntless.

Abstract:

:Drosophila Wingless (Wg) acts as a morphogen during development. Wg secretion is controlled by a seven-pass transmembrane cargo Wntless (Wls). We have recently identified retromer as a key regulator involved in Wls trafficking. As sorting nexin (SNX) molecules are essential components of the retromer complex, we hypothesized that specific SNX(s) is required for retromer-mediated Wnt secretion. Here, we generated Drosophila mutants for all of the eight snx members, and identified Drosophila SNX3 (DSNX3) as an essential molecule required for Wg secretion. We show that Wg secretion and its signaling activity are defective in Dsnx3 mutant clones in wing discs. Wg levels in the culture medium of Dsnx3-depleted S2 cells are also markedly reduced. Importantly, Wls levels are strikingly reduced in Dsnx3 mutant cells, and overexpression of Wls can rescue the Wg secretion defect observed in Dsnx3 mutant cells. Moreover, DSNX3 can interact with the retromer component Vps35, and co-localize with Vps35 in early endosomes. These data indicate that DSNX3 regulates Wg secretion via retromer-dependent Wls recycling. In contrast, we found that Wg secretion is not defective in cells mutant for Drosophila snx1 and snx6, two components of the classical retromer complex. Ectopic expression of DSNX1 or DSNX6 fails to rescue the Wg secretion defect in Dsnx3 mutant wing discs and in Dsnx3 dsRNA-treated S2 cells. These data demonstrate the specificity of the DSNX3-retromer complex in Wls recycling. Together, our findings suggest that DSNX3 acts as a cargo-specific component of retromer, which is required for endocytic recycling of Wls and Wg/Wnt secretion.

journal_name

Cell Res

journal_title

Cell research

authors

Zhang P,Wu Y,Belenkaya TY,Lin X

doi

10.1038/cr.2011.167

subject

Has Abstract

pub_date

2011-12-01 00:00:00

pages

1677-90

issue

12

eissn

1001-0602

issn

1748-7838

pii

cr2011167

journal_volume

21

pub_type

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