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Localization of mLin-7 at nectin-based cell-cell junctions
Yasunori Yamamoto1, Kenji Mandai, Noriko Okabe
1Department of Molecular Biology and Biochemistry, Osaka University Graduate School of Medicine/Faculty of Medicine, Suita 565-0871, Japan.
Abstract:
In C. elegans, lin-7 as well as lin-2/lin-10 is involved in the proper localization of the LET-23 receptor tyrosine kinase that regulates vulval induction. The mammalian homologue, mLin-7, forms a ternary complex with the mammalian homologues of LIN-2 and LIN-10 and localizes at cell-cell junctions in epithelial cells, but the mechanism of this localization of mLin-7 is unknown. Nectin is an immunoglobulin-like cell-cell adhesion molecule that is involved in organization of adherens and tight junctions in epithelial cells. Nectin is indirectly associated with the cadherin-catenin system and the actin cytoskeleton through afadin, an actin filament-binding protein. We showed here that mLin-7 localized at the nectin-based cell-cell junctions. This localization of mLin-7 required the interaction of nectin with afadin, but not the cadherin-catenin system or the actin cytoskeleton. mLin-7 did not directly interact with nectin or afadin. The results indicate that mLin-7 localizes at cell-cell junctions through the nectin-afadin system.
Insights
Mammalian Lin-7 (mLin-7) localizes to cell-cell junctions via the nectin-afadin system. This localization depends on nectin-afadin interaction but not the cadherin-catenin system or actin cytoskeleton.
Area of Science:
- Cell biology
- Molecular biology
- Epithelial cell biology
Background:
- Lin-7 proteins are crucial for receptor localization in C. elegans.
- Mammalian Lin-7 (mLin-7) localizes to epithelial cell-cell junctions, but the mechanism is unclear.
- Nectin and afadin are key components of cell-cell junction organization.
Purpose of the Study:
- To elucidate the mechanism of mLin-7 localization at cell-cell junctions.
- To investigate the role of nectin and afadin in mLin-7 localization.
Main Methods:
- Immunofluorescence microscopy to observe mLin-7 localization.
- Analysis of mLin-7 localization in cells with disrupted nectin-afadin interactions.
- Investigating interactions between mLin-7, nectin, and afadin.
Main Results:
- mLin-7 localizes to nectin-based cell-cell junctions.
- mLin-7 localization requires the nectin-afadin interaction.
- mLin-7 localization is independent of the cadherin-catenin system and actin cytoskeleton.
- mLin-7 does not directly interact with nectin or afadin.
Conclusions:
- mLin-7 localization at cell-cell junctions is mediated by the nectin-afadin system.
- This pathway is distinct from cadherin-catenin and actin cytoskeleton-dependent mechanisms.