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[A mutagenicity study of calcipotriol (MC903)]
T Kitagaki1, Y Oguma, F Yokota
1Japan Seigiken Research Center Co., Ltd., Shizuoka, Japan.
Abstract:
Calcipotriol (MC903), an anti-psoriasic agent, was examined for mutagenicity in the reverse mutation test and the chromosomal aberration test in vitro, and the micronucleus test in Slc:ddY mice. 1. In the reverse mutation test using Salmonella typhimurium (TA100, TA1535, TA98, TA1537) and Escherichia coli (WP2uvrA), MC903 did not significantly increase revertant colonies in any of the test strains with or without metabolic system. 2. In the chromosomal aberration test with a Chinese hamster fibroblast cell line (CHL), MC903 did not significantly increase aberrant cells in the direct method or in the activation method. 3. In the micronucleus test with male mice, MC903 did not significantly increase in the number of polychromatic erythrocytes with micronuclei in the bone marrow. These results suggest that MC903 has no mutagenic as well as clastogenic effects under the present experimental condition.
Insights
Calcipotriol (MC903), a psoriasis treatment, was evaluated for its potential to cause genetic mutations. Studies indicate that MC903 does not exhibit mutagenic or clastogenic effects in various laboratory tests.
Area of Science:
- Toxicology
- Pharmacology
- Genetics
Background:
- Calcipotriol (MC903) is a vitamin D analog widely used as an anti-psoriatic agent.
- Assessing the mutagenicity and clastogenicity of pharmaceutical compounds is crucial for drug safety evaluation.
- Previous safety data for Calcipotriol (MC903) necessitates a thorough examination of its genotoxic potential.
Purpose of the Study:
- To evaluate the mutagenic potential of Calcipotriol (MC903) using bacterial reverse mutation assays.
- To assess the clastogenic effects of Calcipotriol (MC903) in vitro using a chromosomal aberration test.
- To determine the in vivo genotoxicity of Calcipotriol (MC903) through a micronucleus test in mice.
Main Methods:
- Bacterial reverse mutation test (Ames test) with Salmonella typhimurium and Escherichia coli strains.
- In vitro chromosomal aberration test using a Chinese hamster fibroblast cell line (CHL).
- In vivo micronucleus test conducted in Slc:ddY male mice.
Main Results:
- Calcipotriol (MC903) did not induce a significant increase in revertant colonies in any bacterial strains, with or without metabolic activation.
- No significant increase in chromosomal aberrations was observed in Chinese hamster cells treated with Calcipotriol (MC903) under direct or activation conditions.
- The micronucleus test in mice showed no significant elevation in the number of micronucleated polychromatic erythrocytes, indicating no in vivo genotoxicity.
Conclusions:
- The findings suggest that Calcipotriol (MC903) does not possess mutagenic properties.
- Calcipotriol (MC903) demonstrated no clastogenic effects in the conducted in vitro and in vivo genotoxicity assays.
- Under the tested experimental conditions, Calcipotriol (MC903) is considered safe regarding genotoxicity.