title: Regulation of cell adhesion and collective cell migration by hindsight and its human homolog RREB1.
abstract: Cell movements represent a major driving force in embryonic development, tissue repair, and tumor metastasis [1]. The migration of single cells has been well studied, predominantly in cell culture [2, 3]; however, in vivo, a greater variety of modes of cell movement occur, including the movements of cells in clusters, strands, sheets, and tubes, also known as collective cell migrations [4, 5]. In spite of the relevance of these types of movements in both normal and pathological conditions, the molecular mechanisms that control them remain predominantly unknown. Epithelial follicle cells of the Drosophila ovary undergo several dynamic morphological changes, providing a genetically tractable model [6]. We found that anterior follicle cells, including border cells, mutant for the gene hindsight (hnt) accumulated excess cell-cell adhesion molecules and failed to undergo their normal collective movements. In addition, HNT affected border cell cluster cohesion and motility via effects on the JNK and STAT pathways, respectively. Interestingly, reduction of expression of the mammalian homolog of HNT, RREB1, by siRNA inhibited collective cell migration in a scratch-wound healing assay of MCF10A mammary epithelial cells, suppressed surface activity, retarded cell spreading after plating, and led to the formation of immobile, tightly adherent cell colonies. We propose that HNT and RREB1 are essential to reduce cell-cell adhesion when epithelial cells within an interconnected group undergo dynamic changes in cell shape.
authors.affiliation: Department of Biological Chemistry, Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, Maryland 21205, USA.
authors.forename: Mariana
authors.initials: M
authors.lastname: Melani
authors.forename: Kaylene J
authors.initials: KJ
authors.lastname: Simpson
authors.forename: Joan S
authors.initials: JS
authors.lastname: Brugge
authors.forename: Denise
authors.initials: D
authors.lastname: Montell
mesh_terms: D000818:Animals; D001940:Breast / Q000166:cytology; D002448:Cell Adhesion / Q000502:physiology*; D002460:Cell Line; D002465:Cell Movement / Q000502:physiology*; D004268:DNA-Binding Proteins / Q000502:physiology*; D004330:Drosophila / Q000254:growth & development*; D029721:Drosophila Proteins / Q000502:physiology*; D004847:Epithelial Cells / Q000502:physiology; D005260:Female; D006801:Humans; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D009024:Morphogenesis / Q000502:physiology; D009687:Nuclear Proteins / Q000502:physiology*; D010053:Ovary / Q000166:cytology / Q000254:growth & development; D050791:STAT Transcription Factors / Q000378:metabolism; D015398:Signal Transduction / Q000502:physiology; D014157:Transcription Factors / Q000502:physiology*
chemical_list: D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D009687:Nuclear Proteins; C101743:RREB1 protein, human; D050791:STAT Transcription Factors; D014157:Transcription Factors; C106513:peb protein, Drosophila; D048031:JNK Mitogen-Activated Protein Kinases