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The Journal of Immunology, Vol 156, Issue 4 1402-1407, Copyright © 1996 by American Association of Immunologists
ARTICLES |
K Kang, M Kubin, KD Cooper, SR Lessin, G Trinchieri and AH Rook
Department of Dermatology, University of Michigan, Ann Arbor 48109, USA.
IL-12 is a 70-kDa heterodimeric cytokine composed of a p35 chain and p40 chain. This cytokine exerts a powerful positive regulatory influence on the development of Th1 helper T-cell immune responses and is a potent inducer of IFN-gamma production and cytotoxic T cell differentiation and function. Because epidermal Langerhans cells (LC) are important members of the dendritic APC lineage family critical for initiating cell mediated immune responses, we examined LC for their ability to produce IL-12. Epidermal cell (EC) suspensions obtained from volunteers were enriched for, or depleted of, Langerhans cells (CD1a+ EC). Enriched populations contained > 90% CD1a+ cells, whereas depleted populations contained < 1% CD1a+ cells. As assessed by reverse transcription-PCR amplification, IL-12 p40 mRNA was constitutively expressed in LC RNA extracted immediately following keratome harvest, and increased spontaneously after overnight incubation. Radioimmunoassay (RIA) of IL-12 p40 protein on supernatants revealed IL- 12 release by CD1a-enriched fractions of epidermal cells. Ab specific for p40 clearly demonstrated IL-12 in epidermal LC by flow cytometry. A bioassay for the functional IL-12 heterodimer (p70) indicated that LC could produce IL-12 biologic activity, which was neutralized by anti-IL- 12 Ab. These results indicate that epidermal LC, in particular cultured LC maturing into dendritic cells, express IL-12 p40 mRNA, as well as p40 and functional p70 protein, and suggest that this is one mechanism behind the high potency of dendritic APCs, such as LC, to initiate Th1 type immune responses under appropriate conditions.
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