Abstract
Treatment of metastatic melanoma still remains a challenge, since in advanced stage it is refractory to conventional treatments. Most patients with melanoma have either B-RAF or N-RAS mutations, and these oncogenes lead to activation of the RAS-RAF-MEK-ERK and AKT signal pathway, keeping active the proliferation and survival pathways in the cell. Therefore, the identification of small molecules that block metastatic cell proliferation and induce cell death is needed. Violacein, a pigment produced by Chromobacterium violaceum found in Amazon River, has been used by our group as a biotool for scrutinizing signaling pathways associated with proliferation, survival, aggressiveness, and resistance of cancer cells. In the present study, we demonstrate that violacein diminished the viability of RAS- and RAF-mutated melanoma cells (IC50 value ∼500 nM), and more important, this effect was not abolished after treatment medium removal. Furthermore, violacein was able to reduce significantly the invasion capacity of metastatic melanoma cells in 3D culture. In the molecular context, we have shown for the first time that violacein causes a strong drop on histone deacetylase 6 expression, a proliferating activator, in melanoma cells. Besides, an inhibition of AXL and AKT was detected. All these molecular events propitiate an inhibition of autophagy, and consequently, melanoma cell death by apoptosis.
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Abbreviations
- B-RAF:
-
B-RAF proto-oncogene, serine/threonine kinase
- N-RAS:
-
N-RAS proto-oncogene, member of the RAS gene family
- MEK:
-
Mitogen-activated protein kinase kinase
- ERK:
-
Extracellular signal-regulated kinase
- AKT:
-
Serine/threonine-specific protein kinase
- AXL:
-
Tyrosine-protein kinase receptor UFO
- LC3-I/II:
-
Microtubule-associated proteins 1A/1B light chains 3A/LC3A and 3B/LC3B
- p62:
-
Sequestosome-1
- p21:
-
Cyclin-dependent kinase inhibitor 1 or CDK-interacting protein 1
- PARP-1:
-
Poly(ADP-ribose) polymerase-1
- mTOR:
-
Mammalian target of rapamycin, Ser/Thr protein kinase
- HSP90:
-
Heat shock protein 90 kDa
- HDAC:
-
Histone deacetylase
- SIRT:
-
NAD-dependent deacetylase sirtuin-1
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Acknowledgments
This study was supported by São Paulo Research Foundation (FAPESP) and The National Council for Scientific and Technological Development (CNPq). Postdoctoral fellowship for K.J.P.R-B (Proc. 2013/08896-3) was provided by FAPESP, and C.V.F-H. was supported by research fellowships from CNPq.
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Paola R. Gonçalves and Karin J. P. Rocha-Brito contributed equally to this study.
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Gonçalves, P.R., Rocha-Brito, K.J.P., Fernandes, M.R.N. et al. Violacein induces death of RAS-mutated metastatic melanoma by impairing autophagy process. Tumor Biol. 37, 14049–14058 (2016). https://doi.org/10.1007/s13277-016-5265-x
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DOI: https://doi.org/10.1007/s13277-016-5265-x