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BMC Cancer
Published in: BMC Cancer 1/2010

Open Access 01-12-2010 | Research article

Estrogen regulation of TRPM8 expression in breast cancer cells

Authors: Dechen Chodon, Arnaud Guilbert, Isabelle Dhennin-Duthille, Mathieu Gautier, Marie-Sophie Telliez, Henri Sevestre, Halima Ouadid-Ahidouch

Published in: BMC Cancer | Issue 1/2010

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Abstract

Background

The calcium-permeable cation channel TRPM8 (melastatin-related transient receptor potential member 8) is over-expressed in several cancers. The present study aimed at investigating the expression, function and potential regulation of TRPM8 channels by ER alpha (estrogen receptor alpha) in breast cancer.

Methods

RT-PCR, Western blot, immuno-histochemical, and siRNA techniques were used to investigate TRPM8 expression, its regulation by estrogen receptors, and its expression in breast tissue. To investigate the channel activity in MCF-7 cells, we used the whole cell patch clamp and the calcium imaging techniques.

Results

TRPM8 channels are expressed at both mRNA and protein levels in the breast cancer cell line MCF-7. Bath application of the potent TRPM8 agonist Icilin (20 μM) induced a strong outwardly rectifying current at depolarizing potentials, which is associated with an elevation of cytosolic calcium concentration, consistent with established TRPM8 channel properties. RT-PCR experiments revealed a decrease in TRPM8 mRNA expression following steroid deprivation for 48 and 72 hours. In steroid deprived medium, addition of 17-beta-estradiol (E2, 10 nM) increased both TRPM8 mRNA expression and the number of cells which respond to Icilin, but failed to affect the Ca2+ entry amplitude. Moreover, silencing ERα mRNA expression with small interfering RNA reduced the expression of TRPM8. Immuno-histochemical examination of the expression of TRPM8 channels in human breast tissues revealed an over-expression of TRPM8 in breast adenocarcinomas, which is correlated with estrogen receptor positive (ER+) status of the tumours.

Conclusion

Taken together, these results show that TRPM8 channels are expressed and functional in breast cancer and that their expression is regulated by ER alpha.
Appendix
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Metadata
Title
Estrogen regulation of TRPM8 expression in breast cancer cells
Authors
Dechen Chodon
Arnaud Guilbert
Isabelle Dhennin-Duthille
Mathieu Gautier
Marie-Sophie Telliez
Henri Sevestre
Halima Ouadid-Ahidouch
Publication date
01-12-2010
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2010
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-10-212

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