NE-dlg, a mammalian homolog of drosophila dlg tumor suppressor, induces growth suppression and impairment of cell adhesion: possible involvement of down-regulation of β-catenin by NE-dlg expression
✍ Scribed by Norihisa Hanada; Keishi Makino; Hisashi Koga; Tetsuro Morisaki; Hiroaki Kuwahara; Norio Masuko; Yoichi Tabira; Takehisa Hiraoka; Nobuo Kitamura; Akira Kikuchi; Hideyuki Saya
- Book ID
- 102650017
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- French
- Weight
- 679 KB
- Volume
- 86
- Category
- Article
- ISSN
- 0020-7136
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✦ Synopsis
Membrane
-associated guanylate kinases (MAGUKs) are known to function as scaffolds for forming multiprotein complexes at the synaptic junctions of neuronal cells and at sites of epithelial cell-cell contact. In Drosophila, mutations of the lethal (1)-discs large (dlg) gene, which encodes a MAGUK protein, leads to post-synaptic structure defects in neuronal cells and neoplastic overgrowth of epithelial cells. We previously showed that NE-dlg (neuronal and endocrine dlg), a human homolog of the dlg, plays a crucial role in formation of synaptic structure in human neuronal cells. Here we demonstrate that NE-dlg, similar to Drosophila dlg, is involved in regulation of cell cycle progression and adhesive ability of non-neuronal cells. Overexpression of NE-dlg in proliferating cells including various cancer cell lines induced growth suppression and impairment of cell adhesive ability. Furthermore, NE-dlg overexpression caused the down-regulation of -catenin in cancer cells regardless of mutations in the APC (adenomatous polyposis coli) gene. The PDZ domains of NE-dlg were found to be essential for the growth suppression, loss of adhesive property and down-regulation of -catenin. We propose that NE-dlg regulates the cell growth and adhesive ability by controlling the level of -catenin through an APC-independent pathway. Inactivation of NE-dlg may therefore contribute to development and/or progression of human neoplasms. Int.