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. 1985 Aug;82(16):5409–5412. doi: 10.1073/pnas.82.16.5409

Cultured psoriatic fibroblasts from involved and uninvolved sites have a partial but not absolute resistance to the proliferation-inhibition activity of 1,25-dihydroxyvitamin D3.

J A MacLaughlin, W Gange, D Taylor, E Smith, M F Holick
PMCID: PMC390578  PMID: 2991921

Abstract

We examined the responsiveness of cultured dermal fibroblasts from biopsies of uninvolved and involved areas of skin from six patients with psoriasis to the cell-proliferation-inhibition activity of 1,25-dihydroxyvitamin D3 (1,25-(OH)2-D3). Cultured fibroblasts from age-matched controls responded to 1,25-(OH)2-D3 (at 0.01, 1, 10, and 100 microM) in a dose-dependent fashion, whereas cultured psoriatic fibroblasts from involved or uninvolved skin showed no inhibition of proliferation when exposed to 0.01 or 1 microM of 1,25-(OH)2-D3. However, 1,25-(OH)2-D3 did inhibit proliferation of cultured psoriatic fibroblasts when the concentrations were increased to 10 and 100 microM. An analysis of the 1,25-(OH)2-D3 receptors in cultured psoriatic fibroblasts from uninvolved skin revealed that the Kd, nmax, and sedimentation coefficient were identical to the receptors found in the fibroblasts from age-matched controls. Therefore, cultured psoriatic fibroblasts from involved and uninvolved skin have a partial resistance to 1,25-(OH)2-D3, suggesting that there may be a biochemical defect that is inherent in the dermal fibroblasts of psoriatic patients. Recognition of this defect may provide a new approach for the evaluation of the cause and treatment of this disfiguring skin disorder.

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Selected References

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