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Maturation and migration of cutaneous dendritic cells
R Steinman1, L Hoffman, M Pope
1Laboratory of Cellular Physiology and Immunology, Rockefeller University, New York, NY 10021, USA.
The Journal of Investigative Dermatology
|July 1, 1995
Summary
Skin dendritic cells (DCs) migrate and mature upon stimulation, playing a key role in immune responses and HIV-1 infection. Understanding DC trafficking and function is crucial for studying immune dynamics and disease transmission.
Area of Science:
- Immunology
- Dermatology
- Virology
Background:
- Dendritic cells (DCs) are present in skin's epidermis, dermis, and lymphatics.
- These cutaneous DCs possess characteristics similar to DCs from other organs, including T-cell stimulation.
- Mechanisms regulating DC maturation and movement within tissues are critical for immune function.
Purpose of the Study:
- To investigate the regulation of dendritic cell maturation and movement within skin tissues.
- To explore the functional changes of dendritic cells during migration.
- To assess the utility of emigrated skin dendritic cells and T cells in studying clinical conditions, particularly HIV-1 infection.
Main Methods:
- Isolation of dendritic cells from epidermal, dermal, and lymphatic compartments of the skin.
- Analysis of dendritic cell morphology, surface phenotype, and T-cell stimulating activity.
- Organ culture of skin explants to observe dendritic cell emigration and interaction with T cells.
Main Results:
- Epidermal DCs exhibit slow turnover but mobilize to dermis and lymph upon stimulation (e.g., allergens, transplantation), potentially via cytokines like granulocyte macrophage-colony-stimulating factor.
- DC migration is associated with increased expression of antigen-presenting molecules (MHC) and costimulators (B7).
- A steady-state flux of DCs in skin lymph suggests continuous dermal traffic, independent of epidermal DCs.
- Organ-cultured skin explants show emigration of mature DCs that bind T cells.
- Migratory skin cells, particularly DC-T cell conjugates, are readily infected with HIV-1 in vitro without exogenous factors.
- This infection model may mimic sexual transmission, with DC capture of CD4+ memory T cells potentially explaining immune memory loss in HIV infection.
Conclusions:
- Cutaneous dendritic cells are dynamic components of the skin immune system, actively migrating and maturing.
- The interaction between dendritic cells and T cells in the skin is crucial for immune surveillance and presents a potential site for HIV-1 entry and replication.
- Emigrated skin cell cultures provide a valuable model for studying immune responses and viral pathogenesis, including HIV-1 transmission dynamics.