Calcipotriol (hydrate) is a low-calcemic vitamin D receptor (VDR) agonist. Calcipotriol (hydrate) is about 200 times less potent in its effects on calcium metabolism than vitamin D (1,25[OH]D3).1 Binding of calcipotriol (hydrate) to the VDR increases AP-1, a transcription factor important for keratinocyte differentiation, and reduces expression of JunB protein, a transcriptional activator in the inflammatory response.2 Calcipotriol (hydrate) also induces expression of thymic stromal lymphopoietin, which triggers T-cell differentiation in keratinocytes.3
1
Kragballe, K. Vitamin D analogues in the treatment of psoriasis. J Cell Biochem4946-52(1992).
2
Johansen, C., Kragballe, K., Rasmussen, M., et al. Activator protein 1 DNA binding activity is decreased in lesional psoriatic skin compared with nonlesional psoriatic skin. Br J Dermatol151600-607(2004).
3
Li, M., Hener, P., Zhang, Z., et al. Topical vitamin D3 and low-calcemic analogs induce thymic stromal lymphopoietin in mouse keratinocytes and trigger an atopic dermatitis. Proc Natl Acad Sci USA103(31)11736-11741(2006).
Kragballe, K. Vitamin D analogues in the treatment of psoriasis. J Cell Biochem4946-52(1992).
Johansen, C., Kragballe, K., Rasmussen, M., et al. Activator protein 1 DNA binding activity is decreased in lesional psoriatic skin compared with nonlesional psoriatic skin. Br J Dermatol151600-607(2004).
Li, M., Hener, P., Zhang, Z., et al. Topical vitamin D3 and low-calcemic analogs induce thymic stromal lymphopoietin in mouse keratinocytes and trigger an atopic dermatitis. Proc Natl Acad Sci USA103(31)11736-11741(2006).
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