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Additional recommended knowledge
The efficacy of calcipotriol in the treatment of psoriasis was first noticed by the observation of patients receiving various forms of Vitamin D in an osteoporosis study. Unexpectedly, a patient's psoriasis lesions dramatically disappeared. 
The precise mechanism of calcipotriol in remitting psoriasis is not well-understood. However, it has been shown to have comparable affinity with calcitriol (Vit D) for the Vitamin D receptor, while being less than 1% as active as the calcitriol in regulating calcium metabolism. The Vitamin D receptor (VDR) belongs to the steroid/thyroid receptor superfamily, and is found on the cells of many different tissues including the thyroid, bone, kindney, and T cells of the immune system. T cells are known to play a role in psoriasis, and it is thought that the binding of calcipotriol to the VDR modulates the T cells gene transcription of cell differentiation and proliferation related genes.
Usage and Efficacy
Available as a cream, ointment or scalp solution (50mcg/mL), Calcipotriol is applied twice daily to plaque psoriasis on the body or scalp, but not the face. Improvement is usually detectable within 2 weeks. Most patients show some improvement, slightly more so than is seen with the use of corticosteroids alone. Tachyphylaxis does not occur, an improvement over glucocorticoid therapy.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Calcipotriol". A list of authors is available in Wikipedia.|