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2016 ; 7
(49
): 81172-81186
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gab.com Text
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The combination of MLN2238 (ixazomib) with interferon-alpha results in enhanced
cell death in melanoma
#MMPMID27783987
Suarez-Kelly LP
; Kemper GM
; Duggan MC
; Stiff A
; Noel TC
; Markowitz J
; Luedke EA
; Yildiz VO
; Yu L
; Jaime-Ramirez AC
; Karpa V
; Zhang X
; Carson WE 3rd
Oncotarget
2016[Dec]; 7
(49
): 81172-81186
PMID27783987
show ga
The ubiquitin-proteasome signaling pathway is critical for cell cycle regulation
and neoplastic growth. Proteasome inhibition can activate apoptotic pathways.
Bortezomib, a selective proteasome inhibitor, has anti-melanoma activity. MLN2238
(ixazomib), an oral proteasome inhibitor, has improved pharmacotherapeutic
parameters compared to bortezomib. Interferon-alpha (IFN-?), an immune boosting
agent, is FDA-approved for treatment of melanoma. In this study in vitro and in
vivo evaluation of the antitumor potential of ixazomib and combination treatments
with ixazomib and IFN-? were performed. Apoptosis induced by ixazomib was first
observed at 12 hours and was maximal at 48 hours with similar levels of cell
death compared to bortezomib. IFN-? alone had little effect on cell viability in
vitro. However, the combination of ixazomib with IFN-? significantly enhanced
ixazomib's ability to induce apoptotic cell death in BRAF V600E mutant and BRAF
wild-type human melanoma tumor cells. The combination of ixazomib and IFN-? also
enhanced inhibition of cell proliferation in BRAF V600E mutant melanoma tumor
cells; however, this was not seen in BRAF wild-type cells. Ixazomib-induced
apoptosis was associated with processing of the pro-apoptotic proteins
procaspase-3, -7, -8, and -9, and cleavage of poly-ADP-ribose polymerase (PARP).
In an in vivo xenograft model of human melanoma, combination treatment with
IFN-?-2b and ixazomib demonstrated a significant reduction in tumor volume when
compared to vehicle (p = 0.005) and single therapy ixazomib (p = 0.017) and
IFN-?-2b (p = 0.036). These pre-clinical results support further evaluation of
combination treatment with ixazomib and IFN-? for the treatment of advanced BRAF
V600E mutant melanoma.