The tumor suppressor protein TSLC1 is involved in cell-cell adhesion

Mari Masuda, Mika Yageta, Hiroshi Fukuhara, Masami Kuramochi, Tomoko Maruyama, Akio Nomoto, Yoshinori Murakami

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138 Citations (Scopus)

Abstract

TSLC1 is a tumor suppressor gene encoding a member of the immunoglobulin (Ig) superfamily. The significant homology of its extracellular domain with those of other Ig superfamily cell adhesion molecules (IgCAMs) has raised the possibility that TSLC1 participates in cell-cell interactions. In this study, the physiological properties of TSLC1 were investigated in Madin-Darby canine kidney (MDCK) cells expressing TSLC1 tagged with green fluorescent protein (GFP) as well as in the cells that express endogenous TSLC1. Biochemical analysis has revealed that TSLC1 is an N-linked glycoprotein with a molecular mass of 75 kDa and that it forms homodimers through cis interaction within the plane of the cell membranes. Confocal laser scanning microcopy of the cells expressing TSLC1 showed the localization patterns characteristic to adhesion molecules. At the beginning of cell attachment, TSLC1 accumulated in interdigitated structures at cell-cell boundaries, but, when cells reached a confluence, TSLC1 was distributed all along the cell membranes. In polarized cells, TSLC1 was recruited to the lateral membrane, implying trans interaction of TSLC1 between neighboring cells. In support of this notion, MDCK cells expressing TSLC1-GFP showed a significant level of cell aggregation in the absence or presence of Ca 2+ and Mg 2+. Taken together, these results indicate that TSLC1 mediates intracellular adhesion through homophilic interactions in a Ca 2+/Mg 2+-independent manner.

Original languageEnglish
Pages (from-to)31014-31019
Number of pages6
JournalJournal of Biological Chemistry
Volume277
Issue number34
DOIs
Publication statusPublished - 2002 Aug 23
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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  • Cite this

    Masuda, M., Yageta, M., Fukuhara, H., Kuramochi, M., Maruyama, T., Nomoto, A., & Murakami, Y. (2002). The tumor suppressor protein TSLC1 is involved in cell-cell adhesion. Journal of Biological Chemistry, 277(34), 31014-31019. https://doi.org/10.1074/jbc.M203620200