Reference Detail

Ref Type

Journal Article

PMID

(27048951)

Authors

Feng JH, Nakagawa-Goto K, Lee KH, Shyur LF

Title

A Novel Plant Sesquiterpene Lactone Derivative, DETD-35, Suppresses BRAFV600E Mutant Melanoma Growth and Overcomes Acquired Vemurafenib Resistance in Mice.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Molecular cancer therapeutics	15	6	2016 Jun	1163-76	Mol Cancer Ther

URL

Abstract Text

Acquired resistance to vemurafenib develops through reactivation of RAF/MEK/ERK signaling or bypass mechanisms. Recent combination therapies such as a MEK inhibitor combined with vemurafenib show improvement in major clinical end points, but the percentage of patients with adverse toxic events is higher than with vemurafenib monotherapy and most patients ultimately relapse. Therefore, there is an urgent need to develop new antimelanoma drugs and/or adjuvant agents for vemurafenib therapy. In this study, we created a novel semiorganically modified derivative, DETD-35, from deoxyelephantopin (DET), a plant sesquiterpene lactone demonstrated as an anti-inflammatory and anti-mammary tumor agent. Our results show that DETD-35 inhibited proliferation of a panel of melanoma cell lines, including acquired vemurafenib resistance A375 cells (A375-R) established in this study, with superior activities to DET and no cytotoxicity to normal melanocytes. DETD-35 suppressed tumor growth and reduced tumor mass as effectively as vemurafenib in A375 xenograft study. Furthermore, DETD-35 also reduced tumor growth in both acquired (A375-R) and intrinsic (A2058) vemurafenib resistance xenograft models, where vemurafenib showed no antitumor activity. Notably, the combination of DETD-35 and vemurafenib exhibited the most significant effects in both in vitro and in vivo xenograft studies due to synergism of the compound and the drug. Mechanistic studies suggested that DETD-35 overcame acquired vemurafenib resistance at least in part through deregulating MEK-ERK, Akt, and STAT3 signaling pathways and promoting apoptosis of cancer cells. Overall, our results suggest that DETD-35 may be useful as a therapeutic or adjuvant agent against BRAF(V600E) mutant and acquired vemurafenib resistance melanoma. Mol Cancer Ther; 15(6); 1163-76. ©2016 AACR.

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Molecular Profile	Treatment Approach

Gene Name	Source	Synonyms	Protein Domains	Gene Description	Gene Role

Therapy Name	Drugs	Efficacy Evidence	Clinical Trials

Drug Name	Trade Name	Synonyms	Drug Classes	Drug Description
DETD-35				DETD-35 is a derivative of plant sesquiterpene lactone that inhibits Mek-Erk signaling and induces reactive oxygen species generation, which may lead to apoptosis in tumor cells (PMID: 27048951).

Gene	Variant	Impact	Protein Effect	Variant Description	Associated with drug Resistance

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References
BRAF V600E	melanoma	sensitive	DETD-35 + Vemurafenib	Preclinical - Cell line xenograft	Actionable	In a preclinical study, DETD-35 and Zelboraf (vemurafenib) synergistically inhibited proliferation and colony formation of melanoma cells harboring BRAF V600E in culture and reduced tumor size in xenograft models (PMID: 27048951).	27048951
BRAF V600E	melanoma	sensitive	DETD-35	Preclinical - Cell line xenograft	Actionable	In a preclinical study, DETD-35 inhibited proliferation and colony formation of melanoma cells harboring BRAF V600E in culture and reduced tumor size in xenograft models (PMID: 27048951).	27048951
PTEN loss	melanoma	sensitive	DETD-35	Preclinical - Cell line xenograft	Actionable	In a preclinical study, DETD-35 treatment resulted in reduced tumor size in cell line xenograft models of Zelboraf (vemurafenib)-resistant melanoma harboring PTEN loss (PMID: 27048951).	27048951
PTEN loss	melanoma	sensitive	DETD-35 + Vemurafenib	Preclinical - Cell line xenograft	Actionable	In a preclinical study, DETD-35 and Zelboraf (vemurafenib) combination treatment resulted in further reduction of tumor size in cell line xenograft models of Zelboraf (vemurafenib)-resistant melanoma harboring PTEN loss when compared to single agent treatment (PMID: 27048951).	27048951