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Subpopulation of murine epidermal Langerhans cells identified by lectin-binding sites
K Nakamura1, A Ishii, K Tamaki
1Department of Dermatology, Faculty of Medicine, Tokyo University Branch Hospital, University of Tokyo, Japan.
Insights
Epidermal Langerhans cells (LCs) exhibit diverse lectin-binding profiles, indicating heterogeneity within this immune cell population. These profiles remain consistent across different body sites and mouse strains, offering insights into LC function.
Area of Science:
- Immunology
- Cell Biology
- Dermatology
Background:
- Langerhans cells (LCs) are critical immune cells in the epidermis.
- Understanding LC heterogeneity is key to deciphering their role in immune responses.
- Lectin binding can serve as a marker for cell surface carbohydrate expression.
Purpose of the Study:
- To characterize the lectin-binding profiles of epidermal LCs in different mouse strains.
- To investigate changes in lectin-binding profiles of epidermal cells during skin grafting.
- To determine if LCs represent a heterogeneous population based on lectin reactivity.
Main Methods:
- Immunofluorescence staining of epidermal cells from three mouse strains.
- Use of specific lectins including concanavalin A (Con A), Ricinus communis agglutinin 1 (RCA-1), Dolichos biflorus agglutinin (DBA), Peanut agglutinin (PNA), and wheat germ agglutinin (WGA).
- Analysis of lectin-binding profiles in grafted skin to track migrating Ia-positive (Ia+) epidermal cells.
Main Results:
- Epidermal LCs displayed three distinct lectin-binding profiles across all mouse strains.
- Con A and RCA-1 bound to most LCs, while DBA showed no reactivity.
- PNA and WGA bound to a subset of LCs, with altered reactivity observed in migrating cells post-grafting.
Conclusions:
- Epidermal LCs constitute a heterogeneous population defined by their distinct lectin-binding characteristics.
- These lectin-binding profiles are consistent across different body sites and mouse strains.
- Changes in PNA and WGA reactivity in migrating epidermal cells suggest dynamic alterations in cell surface glycans post-transplantation.
Abstract:
Lectin-binding profiles of epidermal Langerhans cells (LCs) were investigated in three strains of mice using immunofluorescence procedures. Three lectin-binding profiles were observed in each strain of mice. Most epidermal LCs reacted with concanavalin A (Con A) and Ricinus communis agglutinin 1 (RCA-1), whereas none reacted with Dolichos biflorus agglutinin (DBA). Peanut agglutinin (PNA) and wheat germ agglutinin (WGA) reacted with some of the epidermal LCs. These binding profiles were similar from site to site of the body in all strains of mice. We also investigated the lectin-binding profiles of epidermal Ia positive (Ia+) cells migrating into the grafted skin up to 165 days after transplantation. BALB/c (H-2d) murine skin was grafted onto the back of (C3H/He x BALB/c)F1 (H-2k x H-2d) mice. The percentages of migrating I-A+ epidermal cells reactive with PNA and WGA were different from those of the normal epidermis soon after grafting and reached a normal level at 43 days after grafting. Our results demonstrated that there is a heterogeneous population of epidermal LCs defined by lectin-binding profiles.
