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Transforming growth factor (TGF) -beta has been suggested to be an effective inhibitor for abnormal keratinocyte growth in psoriasis. As a majority of the secreted TGF-beta are biologically latent complexes, activation is essential for TGF-beta-mediated cellular responses in vitro and in vivo. Objectives Here we report the response of the TGF-beta regulation system to 1alpha,25-dihydroxyvitamin D3 [1,25(OH)2D3], an active vitamin D3 analogue Patients/methods We studied two types of fibroblasts derived from normal and psoriatic lesional skin, using an enzyme-linked immunosorbent assay and Northern blotting techniques.
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