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The effect of retinoids on dendritic cell function.

P A Bedford¹, S C Knight

¹Division of Immunological Medicine, Clinical Research Centre, Harrow, UK.

Clinical and Experimental Immunology

|March 1, 1989

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Retinoids impact dendritic cell (DC) function, reducing their ability to stimulate immune responses. This suggests retinoids modulate immunity by affecting how DCs present antigens.

Area of Science:

Immunology
Cell Biology
Dermatology

Background:

Dendritic cells (DCs) are crucial for initiating adaptive immune responses.
Retinoids, vitamin A derivatives, are known for their roles in cell differentiation and immune regulation.
The precise effect of retinoids on DC antigen-presenting function requires further elucidation.

Purpose of the Study:

To investigate the impact of retinoic acid administration on the antigen-presenting capacity of mouse dendritic cells.
To determine if retinoids directly affect DC function or influence other immune cells.
To explore the dose-dependent effects of retinoids on DC-mediated allogeneic stimulation.

Main Methods:

Spleen cells and isolated dendritic cells (DCs) from mice were cultured with varying concentrations of retinoic acid.

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Mixed leukocyte reactions (MLRs) were performed using treated and untreated DCs with allogeneic lymphocytes.

Dendritic cells were pulsed with retinoic acid before co-culture.

Mice were fed diets enriched with vitamin A analogues (VAA) to assess in vivo effects.

Main Results:

Retinoic acid treatment did not alter the number of DCs but significantly reduced their stimulatory capacity in MLRs.
High-dose retinoic acid (10(-6)-10(-4) M) pulsed onto DCs inhibited allogeneic stimulation, while low doses (10(-14)-10(-20) M) enhanced it.
DCs from VAA-enriched diet mice showed reduced allogeneic lymphocyte stimulation.
Retinoid effects on responding lymphocytes were dependent on the presence of DCs.

Conclusions:

Retinoids, particularly at higher concentrations, can suppress the antigen-presenting function of dendritic cells.
The immunomodulatory effects of retinoids may be mediated through their direct impact on DC efficiency in antigen presentation.
Dietary vitamin A intake influences DC function, suggesting a link between nutrition and immune response modulation.