Calcipotriol

Calcipotriol, also known as calcipotriene, is a synthetic derivative of calcitriol, a form of vitamin D. It is used in the treatment of psoriasis. It is safe for long-term application in psoriatic skin conditions. See also Calcipotriol and Vitamin D receptor (also called calcitriol receptor).

The precise mechanism of calcipotriol in remitting psoriasis is not well understood. However, it has been shown to have comparable affinity with calcitriol for the vitamin D receptor (VDR), while being less than 1% as active as the calcitriol in regulating calcium metabolism. The vitamin D receptor belongs to the steroid/thyroid receptor superfamily, and is found on the cells of many different tissues including the thyroid, bone, kidney, 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.

In mouse studies, topical calcipotriol administration to the ear and dorsal skin led to a dose-dependent increase in the production of the epithelial cell-derived cytokine TSLP by keratinocytes, and triggered atopic dermatitis at high concentrations.^[1] This upregulation of TSLP production due to calcipotriol application is thought to be mediated through the coactivation of vitamin D receptor/Retinoid X receptor α and vitamin D receptor/Retinoid X receptor β heterodimers.

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