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  • Title: Human epidermal Langerhans cells are selectively recognized by galectin-3 but not by galectin-1.
    Author: Holíková Z, Smetana K, Bartůnková J, Dvoránková B, Kaltner H, Gabius HJ.
    Journal: Folia Biol (Praha); 2000; 46(5):195-8. PubMed ID: 11055799.
    Abstract:
    Langerhans cells are dendritic antigen-presenting cells residing predominantly in the epidermis. Since endogenous galactoside-binding lectins with the jelly-roll motif (galectins) are known to trigger cellular responses, including mediator release, we investigated by lectin histochemistry the cells' capacity to bind two common members of this family, i.e. galectin-1 and -3. Actually, surrounding keratinocytes express a high level of galectin-3, and these cells can be considered as donors of this lectin to Langerhans cells. Employing biotinylated galectin-1 and -3, and concomitantly an antibody against CD1a as a second marker, to visualize the position of Langerhans cells in the human epidermis, the expression of galectin-3-reactive glycoligands in contrast to the lack of binding of galectin-1 was observed. Although the functional consequences of this selectivity are unclear, these results reveal an example for differential cellular reactivity towards two related endogenous lectins.
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