Abstract
Melanoma is the most dangerous form of skin cancer occurring in Caucasians with rising incidence. They are remarkably resistant to conventional anti-tumour therapies like chemotherapy and radiotherapy. Therefore, new treatment strategies are urgently needed. Anti-tumour effects of phytochemicals such as allyl isothiocyanate or cinnamaldehyde have been demonstrated in various melanoma models in vitro and in vivo. Considering their high potency as transient receptor potential A1 (TRPA1)-activating compounds, we examined the functional expression of TRPA1 channels in different melanoma cell lines as well as in non-malignantly transformed primary melanocytes. The presence of TRPA1 transcripts could be detected in most of the melanoma cell lines. Furthermore, single-cell calcium imaging and patch clamp electrophysiology confirmed the presence of functional TRPA1 channels in those cell lines. Proliferation assays revealed that allyl isothiocyanate and cinnamaldehyde clearly reduce the proliferation of melanoma cells, but this effect is independent of an activation of TRPA1 channels, making it unlikely that ionic currents through TRPA1 are responsible for the anti-tumour effects of mustard oil and cinnamaldehyde.
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Acknowledgments
We thank Nicole Urban for excellent technical assistance. This work was supported by the Deutsche Forschungsgemeinschaft (HI 829/2-1 and GRK1097).
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Oehler, B., Scholze, A., Schaefer, M. et al. TRPA1 is functionally expressed in melanoma cells but is not critical for impaired proliferation caused by allyl isothiocyanate or cinnamaldehyde. Naunyn-Schmiedeberg's Arch Pharmacol 385, 555–563 (2012). https://doi.org/10.1007/s00210-012-0747-x
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DOI: https://doi.org/10.1007/s00210-012-0747-x