BH3 mimetics potentiate pro-apoptotic activity of encorafenib in BRAFV600E melanoma cells.

Abstract:

:BRAFV600- and MEK1/2-targeting therapies rarely produce durable response in melanoma patients. We investigated five BRAFV600E melanoma cell lines derived from drug-naïve tumor specimens to assess cell death response to encorafenib (Braftovi), a recently FDA-approved BRAFV600 inhibitor. Drug-naïve cell lines (i) did not harbor damaging alterations in genes encoding core apoptotic machinery, but they differed in (ii) mitochondrial priming as demonstrated by whole-cell BH3 profiling, and (iii) levels of selected anti-apoptotic proteins. Encorafenib modulated the balance between apoptosis-regulating proteins as it upregulated BIM and BMF, and attenuated NOXA, but did not affect the levels of pro-survival proteins except for MCL-1 and BCL-XL in selected cell lines. Induction of apoptosis could be predicted using Dynamic BH3 profiling. The extent of apoptosis was dependent on both (i) cell-intrinsic proximity to the apoptotic threshold (initial mitochondrial priming) and (ii) the abundance of encorafenib-induced BIM (iBIM; drug-induced change in priming). While co-inhibition of MCL-1 and BCL-XL/BCL-2 was indispensable for apoptosis in drug-naïve cells, encorafenib altered cell dependence to MCL-1, and reliance on BCL-XL/BCL-2 was additionally found in cell lines that were highly primed to apoptosis by encorafenib. This translated into robust apoptosis when encorafenib was combined with selective BH3 mimetics. Our study provides a mechanistic insight into the role of proteins from the BCL-2 family in melanoma cell response to targeted therapy, and presents preclinical evidence that (i) MCL-1 is a druggable target to potentiate encorafenib activity, whereas (ii) pharmacological inhibition of BCL-XL/BCL-2 might be relevant but only for a narrow group of encorafenib-treated patients.

journal_name

Cancer Lett

journal_title

Cancer letters

authors

Hartman ML,Gajos-Michniewicz A,Talaj JA,Mielczarek-Lewandowska A,Czyz M

doi

10.1016/j.canlet.2020.11.036

subject

Has Abstract

pub_date

2021-02-28 00:00:00

pages

122-136

eissn

0304-3835

issn

1872-7980

pii

S0304-3835(20)30635-2

journal_volume

499

pub_type

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