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Induction of the members of Notch pathway in superficial basal cell carcinomas treated with imiquimod

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Abstract

Basal cell carcinoma of the skin (BCC) is the most common skin tumor in Caucasians worldwide. Different therapeutic options are available to treat BCC, including topical immunotherapy. Imiquimod is topical Toll-like receptor 7 agonist that activates anti-tumor immune response and has been recently approved for the treatment of superficial BCC (sBCC). We sought to investigate the influence of imiquimod treatment on the members of the Notch signaling pathway, whose activity is known to be decreased in BCCs. Six patients with sBCC were evaluated for Notch1, Jagged1 and Delta1 expression before (pre-treatment) and after the beginning of the topical treatment (post-treatment) with imiquimod using real-time PCR and immunohistochemistry. We show selective transcriptional up-regulation of Notch pathway members (Notch1, Jagged1 and Delta1) in tumor cells of the sBCC post-treatment. Furthermore, we demonstrate minor increase of Notch1 protein expression on infiltrating cells as well as strong increase in Jagged1 protein expression in regressing sBCC tumors post-treatment. In this way, imiquimod may act as a stimulator of the Notch pathway in sBCC tumor cells by up-regulating protein expression of the Notch ligand, Jagged1. Via induction of Notch signaling imiquimod may exert tumor suppressor function, which together with its proinflammatory properties results in tumor regression.

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Acknowledgments

The authors would like acknowledge the expert technical assistance of Christa Dudli in immunohistochemistry.

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Authors and Affiliations

  1. Department of Dermatology, University Hospital Zurich, Gloriastrasse 31, 8091, Zurich, Switzerland

    Maja Wuest, Reinhard Dummer & Mirjana Urosevic

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  1. Maja Wuest
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  2. Reinhard Dummer
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  3. Mirjana Urosevic
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Correspondence to Mirjana Urosevic.

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Wuest, M., Dummer, R. & Urosevic, M. Induction of the members of Notch pathway in superficial basal cell carcinomas treated with imiquimod. Arch Dermatol Res 299, 493–498 (2007). https://doi.org/10.1007/s00403-007-0785-2

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  • DOI: https://doi.org/10.1007/s00403-007-0785-2

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