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2018 ; 9
(8
): 798
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Suppression of Notch1 and AKT mediated epithelial to mesenchymal transition by
Verrucarin J in metastatic colon cancer
#MMPMID30038258
Pal D
; Tyagi A
; Chandrasekaran B
; Alattasi H
; Ankem MK
; Sharma AK
; Damodaran C
Cell Death Dis
2018[Jul]; 9
(8
): 798
PMID30038258
show ga
Epithelial to mesenchymal transition (EMT) in colorectal cancer (CRC) has been
attributed to activation of AKT and Notch1 signaling pathways. As EMT corresponds
to increased aggressiveness of CRC, approaches that prevent metastasis by
targeting AKT/Notch1 pathways are at the forefront of current research paradigms.
This study examined the anti-metastatic potential of Verrucarin J (VJ), a small
molecule, in CRC cells overexpressing AKT and Notch1. VJ significantly inhibited
AKT/HCT 116 cell growth by acting on the AKT/NF?B/Bcl-2 signaling axis and
initiated apoptotic signaling as was evident from increased expression of
pro-apoptotic markers such as cleaved PARP, cleaved caspase 3, and cleaved
caspase 9. Also, VJ inhibited the cell growth in AKT/Notch1-overexpressing CRC
cells and abrogated EMT. The down-regulation of AKT and Notch1 signaling was
apparent in immunoblot analysis and corresponded with down-regulation of
mesenchymal markers including Snail, and ?-catenin. Intraperitoneal
administration of VJ in control (pCMV/HCT 116) and AKT/HCT 116 mice significantly
suppressed AKT-induced tumor growth in a xenograft model. In addition,
down-regulation of prosurvival markers as well as AKT and Notch1 was observed in
the immunohistochemical analysis of the xenografted tumors. In conclusion, our
study substantiates the role of AKT and Notch1 in cell proliferation,
angiogenesis, and EMT of CRC cells and demonstrates that VJ may be a viable
therapeutic option to counter AKT-induced cell proliferation and tumor outgrowth
in CRC.