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Endothelin-1 decreases basic apoptotic rates in human melanoma cell lines
Jürgen Eberle1, Lothar F Fecker, Constantin E Orfanos
1Department of Dermatology, University Medical Center Benjamin Franklin, The Free University of Berlin, Berlin, Germany. eberle@ukbf.fu-berlin.de
The Journal of Investigative Dermatology
|September 17, 2002
Summary
Endothelin-1 exhibits an antiapoptotic effect on melanoma cells, contrary to previous findings. This receptor-specific activity, mediated by endothelin B receptor (ET(B)-R), suggests a role in melanoma progression.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Normal melanocytes proliferate and differentiate in response to endothelin-1.
- Melanoma cells often exhibit downregulated endothelin B receptor (ET(B)-R), but tumors show upregulation.
- Endothelin-1's role in melanoma is debated, with reported pro-apoptotic versus pro-survival activities.
Purpose of the Study:
- Investigate the role of endothelin-1 in melanoma cell apoptosis and proliferation.
- Clarify the receptor-specific mechanisms of endothelin-1 action in melanoma.
Main Methods:
- Treatment of normal human melanocytes and melanoma cell lines with endothelin-1.
- Assessment of thymidine incorporation for proliferation.
- Determination of apoptotic rates.
- ET(B)-R expression analysis and overexpression studies in melanoma cells.
Main Results:
- Endothelin-1 showed a strong mitogenic effect on normal melanocytes but a limited proliferative response in melanoma cells.
- Endothelin-1 significantly reduced basal apoptotic rates in both normal melanocytes and most melanoma cell lines.
- The antiapoptotic effect was mediated specifically by ET(B)-R, as demonstrated by restoration of response in ET(B)-R-deficient cells via overexpression.
Conclusions:
- Endothelin-1 exerts an antiapoptotic effect on melanoma cells, suggesting a pro-survival role.
- The antiapoptotic activity is dependent on endothelin B receptor (ET(B)-R) expression.
- Upregulation of ET(B)-R in melanoma tumors combined with this antiapoptotic effect may contribute to melanoma progression.