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Lex and related structures as adhesion molecules

  • Biochemistry and Function of CD15
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Summary and conclusion

Lex (α1→3 fucosylated type 2 chain) functions as an adhesion molecule capable of Ca2+-mediated homotypic binding. Cells with high surface expression of Lex therefore exhibit strong self-aggregation (based on Lex-Lex interaction) in the presence of Ca2+. In this review, I have summarized several lines of supporting data for this concept, and the role of Lex-Lex interaction in the process of embryo compaction and autoaggregation of F9 teratocarcinoma cells. In general, cell adhesion events based on Lex-Lex interaction may be followed and reinforced by integrin- or Ig receptor-based adhesion systems.

SLex, the 2→3 sialosyl derivative of Lex, and its positional isomer SLea, have been identified as the target molecules for selectin-dependent cell adhesion. Adhesion of leukocytes or tumour cells to ECs or platelets, which express E-selectin and P-selectin respectively, is initiated by this process. The target epitopes SLex and SLea are presented mainly on transmembrane glycoproteins having many clusters of O-linked carbohydrate chains. Therefore, inhibition of O-glycosylation may be effective for blocking selectin-mediated cell adhesion. The abundant presence of Lex epitope in the central nervous system, and the physiological changes of Lex expression as described in this monograph, reflect the adhesive properties of this molecule and its sialyosylated and/or fucosylated derivatives.

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Authors and Affiliations

  1. The Biomembrane Institute, 201 Elliott Ave W, 98119, Seattle, WA, USA

    Sen-Itiroh Hakomori

  2. Department of Pathobiology, University of Washington, 98195, Seattle, WA, USA

    Sen-Itiroh Hakomori

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  1. Sen-Itiroh Hakomori
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Hakomori, SI. Lex and related structures as adhesion molecules. Histochem J 24, 771–776 (1992). https://doi.org/10.1007/BF01046348

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  • DOI: https://doi.org/10.1007/BF01046348

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