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Published in: Cancer Chemotherapy and Pharmacology 5/2020

01-05-2020 | NSCLC | Original Article

Evaluating the immunoproteasome as a potential therapeutic target in cisplatin-resistant small cell and non-small cell lung cancer

Authors: Tetsuaki Shoji, Eiki Kikuchi, Junko Kikuchi, Yuta Takashima, Megumi Furuta, Hirofumi Takahashi, Kosuke Tsuji, Makie Maeda, Ichiro Kinoshita, Hirotoshi Dosaka-Akita, Jun Sakakibara-Konishi, Satoshi Konno

Published in: Cancer Chemotherapy and Pharmacology | Issue 5/2020

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Abstract

Purpose

We evaluated the expression of proteasome subunits to assess whether the proteasome could be a therapeutic target in cisplatin-resistant lung cancer cells.

Methods

Cisplatin-resistant (CR) variants were established from three non-small cell lung cancer (NSCLC) cell lines (A549, H1299, and H1975) and two small cell lung cancer (SCLC) cell lines (SBC3 and SBC5). The expression of proteasome subunits, the sensitivity to immunoproteasome inhibitors, and 20S proteasomal proteolytic activity were examined in the CR variants of the lung cancer cell lines.

Results

All five CR cell lines highly expressed one or both of the immunoproteasome subunit genes, PSMB8 and PSMB9, while no clear trend was observed in the expression of constitutive proteasome subunits. The CR cells expressed significantly higher levels of PSMB8 and PSMB9 proteins, as well. The CR variants of the H1299 and SBC3 cell lines were more sensitive to immunoproteasome inhibitors, and had significantly more proteasomal proteolytic activity than their parental counterparts.

Conclusions

The immunoproteasome may be an effective therapeutic target in a subset of CR lung cancers. Proteasomal proteolytic activity may be a predictive marker for the efficacy of immunoproteasome inhibitors in cisplatin-resistant SCLC and NSCLC.
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Metadata
Title
Evaluating the immunoproteasome as a potential therapeutic target in cisplatin-resistant small cell and non-small cell lung cancer
Authors
Tetsuaki Shoji
Eiki Kikuchi
Junko Kikuchi
Yuta Takashima
Megumi Furuta
Hirofumi Takahashi
Kosuke Tsuji
Makie Maeda
Ichiro Kinoshita
Hirotoshi Dosaka-Akita
Jun Sakakibara-Konishi
Satoshi Konno
Publication date
01-05-2020
Publisher
Springer Berlin Heidelberg
Published in
Cancer Chemotherapy and Pharmacology / Issue 5/2020
Print ISSN: 0344-5704
Electronic ISSN: 1432-0843
DOI
https://doi.org/10.1007/s00280-020-04061-9

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