Awd, the homolog of metastasis suppressor gene Nm23, regulates Drosophila epithelial cell invasion.

Molecular and Cellular Biology
Gouthami NallamothuTien Hsu

Abstract

Border cell migration during Drosophila melanogaster oogenesis is a highly pliable model for studying epithelial to mesenchymal transition and directional cell migration. The process involves delamination of a group of 6 to 10 follicle cells from the epithelium followed by guided migration and invasion through the nurse cell complex toward the oocyte. The guidance cue is mainly provided by the homolog of platelet-derived growth factor/vascular endothelial growth factor family of growth factor, or Pvf, emanating from the oocyte, although Drosophila epidermal growth factor receptor signaling also plays an auxiliary role. Earlier studies implicated a stringent control of the strength of Pvf-mediated signaling since both down-regulation of Pvf and overexpression of active Pvf receptor (Pvr) resulted in stalled border cell migration. Here we show that the metastasis suppressor gene homolog Nm23/awd is a negative regulator of border cell migration. Its down-regulation allows for optimal spatial signaling from two crucial pathways, Pvr and JAK/STAT. Its overexpression in the border cells results in stalled migration and can revert the phenotype of overexpressing constitutive Pvr or dominant-negative dynamin. This is a rare example dem...Continue Reading

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Feb 22, 2011·Naunyn-Schmiedeberg's Archives of Pharmacology·Tien Hsu
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