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Published on: December 15, 2011
Human epidermal Langerhans cells are selectively recognized by galectin-3 but not by galectin-1
Z Holíková1, K Smetana, J Bartůnková
1Charles University, 1st Faculty of Medicine, Institute of Anatomy, Prague, Czech Republic.
Insights
Langerhans cells in the epidermis bind galectin-3 from surrounding keratinocytes but not galectin-1. This differential lectin binding highlights distinct cellular responses to related endogenous proteins.
Area of Science:
- Immunology
- Dermatology
- Glycobiology
Background:
- Langerhans cells are key antigen-presenting cells in the epidermis.
- Endogenous galectins (galectin-1, galectin-3) are known to modulate cellular functions.
- Understanding lectin-cell interactions in the skin is crucial for immunology and dermatology.
Purpose of the Study:
- To investigate the binding capacity of Langerhans cells for galectin-1 and galectin-3.
- To explore the role of keratinocytes as potential donors of galectins to Langerhans cells.
- To determine differential cellular reactivity towards related endogenous lectins.
Main Methods:
- Lectin histochemistry was employed to detect galectin binding.
- Biotinylated galectin-1 and galectin-3 were used as probes.
- An antibody against CD1a served as a marker for Langerhans cells in human epidermis.
Main Results:
- Langerhans cells exhibited binding of galectin-3, but not galectin-1.
- High levels of galectin-3 were observed in keratinocytes surrounding Langerhans cells.
- Galectin-3-reactive glycoligands were detected on Langerhans cells.
Conclusions:
- Langerhans cells display selective binding towards galectin-3 over galectin-1.
- Keratinocytes can serve as a source of galectin-3 for Langerhans cells.
- This differential reactivity suggests distinct functional roles for galectins in epidermal cell interactions.
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.
