Calcipotriol monohydrate|147657-22-5|安捷凯

Background

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 psoriasisJ. Cell. Biochem.4946-52(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 skinBr. J. Dermatol.151600-607(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 dermatitisProc. Natl. Acad. Sci. USA103(31)11736-11741(2006)

Protocol

Cell experiment:

Normal human epidermal keratinocytes (NHEK) are grown in serum-free keratinocyte growth medium Epilife and used at third passage in all experiments. Growth supplement is omitted 48 h before experiments. As a control, IL-17A and IL-22 are either added or not added to the cells. Cultured NHEK cells are stimulated with IL-17A (200 ng/mL) and/or IL-22 (200 ng/mL) followed by co-incubation in the presence or absence of Calcipotriol at 0.2-40 nM to test its modulatory effect. Cells are harvested 3 days later and subjected to real-time quantitative PCR (qPCR). Culture supernatants are also collected and frozen at -80°C until use for ELISA[1].

Animal experiment:

Mice[3]The 160 female SKH-1 hairless mice (6-7 weeks of age) are used. After UV treatment, mice without tumors are randomly divided into five groups, four chemoprevention groups (Diclofenac plus DFMO; Diclofenac plus Calcipotriol; DFMO plus calcitriol; and Diclofenac plus DFMO plus Calcipotriol) and one placebo group (skin lotion). The placebo group used in this study is the same as the one used in an earlier study. The mice are treated with test mixtures once a day, five days a week, for a total of 17 weeks. The test mixtures are applied topically on the dorsal surface of the mice. Ten microliters are applied by a pipette after which the mixture is rubbed onto the skin. This corresponded to the following doses of each active substance in the treatments: 100 μg/week for Diclofenac (30 mg/g undiluted), 0.166 μg/week for Calcitriol (50 μg/g undiluted), and 463.3 μg/week for difluoromethylornithine (DFMO) (139 mg/g undiluted).

参考文献:

[1]. Sakabe JI, et al. Calcipotriol Increases hCAP18 mRNA Expression but Inhibits Extracellular LL37 Peptide Production in IL-17/IL-22-stimulated Normal Human Epidermal Keratinocytes. Acta Derm Venereol. 2014 Sep;94(5):512-6.
[2]. Al-Jaderi Z, et al. Effects of vitamin D3, calcipotriol and FTY720 on the expression of surface molecules and cytolytic activities of human natural killer cells and dendritic cells. Toxins (Basel). 2013 Oct 28;5(11):1932-47.
[3]. Pommergaard HC, et al. Combination chemoprevention with diclofenac, calcipotriol and difluoromethylornithine inhibits development of non-melanoma skin cancer in mice. Anticancer Res. 2013 Aug;33(8):3033-9.