Abstract
The discovery of B-RAF activating mutations in malignant melanoma cells has led to the development of a number of targeted drugs, which block exclusively the mutant B-RAF protein. Tumor cells often acquire resistance to B-RAF inhibitors via activation of alternative signaling pathways. One of the resistance mechanisms is activation of PDGF, VEGF, c-KIT, and certain other tyrosine kinases. The possibility of overcoming the resistance to the B-RAF inhibitor Vemurafenib by inactivating receptor tyrosine kinases (RTKs) was studied in metastatic melanoma cell lines differing in B-RAF mutations and RTK activity. It was found that RTK inactivation may help to overcome resistance to B-RAF inhibitors via inhibition of tyrosine kinase phosphorylation and a subsequent blocking of the PI3K-AKT-mTOR and MEK-ERK1/2 downstream signaling pathways. The changes eventually mitigated the cell growth and enhanced the Vemurafenibdependent cell cycle arrest.
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Abbreviations
- DMSO:
-
dimethyl sulfoxide
- MM:
-
metastatic melanoma
- MTT:
-
3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyltetrazolium bromide
- RTK:
-
receptor tyrosine kinase
- TGI:
-
tumor growth inhibition
- FBS:
-
fetal bovine serum
- EDTA:
-
ethylenediaminetetraacetic acid
- AKT:
-
RAC-α-serine/threonineprotein kinase
- B-RAF:
-
B-Raf proto-оncogene, serine/threonine kinase
- CD31:
-
cluster of differentiation 31 (platelet endothelial cell adhesion molecule)
- ErbB/HER:
-
epidermal growth factor receptor
- ERK1/2:
-
extracellular signal-regulated kinase 1/2
- c-KIT:
-
thyrosine protein kinase KIT (mast/stem cell growth factor receptor)
- MEK:
-
mitogen-activated protein kinase kinase
- c-MET:
-
tyrosine-protein kinase Met (hepatocyte growth factor)
- PDGF:
-
platelet-derived growth factor
- PDGFRα and PDGFRβ:
-
platelet-derived growth factor receptors α and β
- PI3K:
-
phosphoinositide 3-kinase
- mTOR:
-
mammalian target of rapamycin
- VEGF:
-
vascular endothelial growth factor
- VEGFR2:
-
vascular endothelial growth factor receptor 2
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Original Russian Text © O.O. Ryabaya, A.A. Malysheva, Yu.A. Khochenkova, E.Sh. Solomko, D.A. Khochenkov, 2018, published in Molekulyarnaya Biologiya, 2018, Vol. 52, No. 3, pp. 466–473.
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Ryabaya, O.O., Malysheva, A.A., Khochenkova, Y.A. et al. Inactivation of Receptor Tyrosine Kinases Overcomes Resistance to Targeted B-RAF Inhibitors in Melanoma Cell Lines. Mol Biol 52, 398–405 (2018). https://doi.org/10.1134/S0026893318020115
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DOI: https://doi.org/10.1134/S0026893318020115