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HERO ID
6943426
Reference Type
Journal Article
Title
Glutathione S-transferase omega 1 inhibition activates JNK-mediated apoptotic response in breast cancer stem cells
Author(s)
Manupati, K; Debnath, S; Goswami, K; Bhoj, PS; Chandak, HS; Bahekar, SP; Das, A; ,
Year
2019
Is Peer Reviewed?
1
Journal
FEBS Journal
ISSN:
1742-464X
EISSN:
1742-4658
Publisher
WILEY
Location
HOBOKEN
Volume
286
Issue
11
Page Numbers
2167-2192
Language
English
PMID
30873742
DOI
10.1111/febs.14813
Web of Science Id
WOS:000470785300011
URL
https://www.proquest.com/docview/2233711563?accountid=171501&bdid=64576&_bd=4Dd61kH4fBvCvo1wrYtrEqlX5AM%3D
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Abstract
Glutathione S-transferase omega 1 (GSTO1) contributes to the inactivation of a wide range of drug compounds via conjugation to glutathione during phase reactions. Chemotherapy-induced GSTO1 expression in breast cancer cells leads to chemoresistance and promotes metastasis. In search of novel GSTO1 inhibitors, we identified S2E, a thia-Michael adduct of sulfonamide chalcone with low LC50 (3.75 +/- 0.73 mu m) that binds to the active site of GSTO1, as revealed by molecular docking (glide score: -8.1), cellular thermal shift assay and fluorescence quenching assay (K-b approximate to 10 x 10(5) mol center dot L-1). Docking studies confirmed molecular interactions between GSTO1 and S2E, and identified the hydrogen bond donor Val-72 (2.14 angstrom) and hydrogen bond acceptor Ser-86 (2.77 angstrom). Best pharmacophore hypotheses could effectively map S2E and identified the 4-methyl group of the benzene sulfonamide ring as crucial to its anti-cancer activity. Lack of a thiophenyl group in another analog, 2e, reduced its efficacy as observed by cytotoxicity and pharmacophore matching. Furthermore, GSTO1 inhibition by S2E, along with tamoxifen, led to a significant increase in apoptosis and decreased migration of aggressive MDA-MB-231 cells, as well as significantly decreased migration, invasion and mammosphere formation in sorted breast cancer stem cells (CSCs, CD24(-)/CD44(+)). GSTO1 silencing in breast CSCs also significantly increased apoptosis and decreased migration. Mechanistically, GSTO1 inhibition activated the c-Jun N-terminal kinase stress kinase, inducing a mitochondrial apoptosis signaling pathway in breast CSCs via the pro-apoptotic proteins BAX, cytochrome c and cleaved caspase 3. Our study elucidated the role of the GSTO1 inhibitor S2E as a potential therapeutic strategy for preventing chemotherapy-induced breast CSC-mediated cancer metastasis and recurrence.
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