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Protein & Peptide Letters

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Research Article

GSK3β/ITCH/c-FLIP Axis Counteracts TRAIL-induced Apoptosis in Human Lung Adenocarcinoma Cells

Author(s): Xiaofen Zheng, Donglan Huang, Xiaohui Liu, Qiu-Yu Liu, Xuejuan Gao* and Langxia Liu*

Volume 30, Issue 3, 2023

Published on: 10 February, 2023

Page: [242 - 249] Pages: 8

DOI: 10.2174/0929866530666230112165515

Price: $65

Abstract

Aims: Further investigation on the mechanism of action of tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) in NSCLC would shed light on the understanding of TRAIL resistance and provide new clues for the counter-strategy.

Background: Cellular FLICE-inhibitory protein (c-FLIP) is a critical inhibitor of TRAIL-induced apoptosis. Our previous study suggested that glycogen synthase kinase 3β (GSK3β) positively regulated c-FLIP expression in human lung adenocarcinoma cells. Meanwhile, other studies reported that c-FLIP was degraded by HECT-type E3 ligase ITCH (Itchy E3 Ubiquitin Protein Ligase) via the proteasome pathway.

Objective: We will explore whether ITCH is involved in the expression regulation of c-FLIP positively controlled by GSK3β during the treatment of TRAIL.

Methods: Human lung adenocarcinoma cells were used to stably overexpress and knockdown GSK3β. Quantitative real-time PCR (qRT-PCR) assay was used to test the expressional level of mRNA of genes. Western blot analysis was employed to detect the expression of proteins at the protein level. siRNA of ITCH was used to knock down its expression. TRAIL treatment was used to cause apoptosis.

Results: In the present study, we have confirmed the degradation of c-FLIP by ITCH protein and the downregulation of ITCH expression by GSK3β in lung adenocarcinoma cells. Moreover, ITCH silencing reversed the downregulation of c-FLIP protein caused by GSK3β-knockdown in the cells. Accordingly, TRAIL-induced apoptosis facilitated by GSK3β knockdown was blocked by the combined interference of ITCH.

Conclusion: These results suggested that GSK3β/ITCH axis regulated the stability of c-FLIP and influenced TRAIL-induced apoptosis. Taken together, our study revealed a GSK3β/ITCH/c-FLIP axis, which counteracts TRAIL-induced apoptosis in human lung adenocarcinoma cells.

Keywords: ITCH, GSK3β, c-FLIP, TRAIL, lung adenocarcinoma, E3 ligase.

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