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Ca(2+)‐activated K(+) channel K(Ca)1.1 as a therapeutic target to overcome chemoresistance in three‐dimensional sarcoma spheroid models

The large‐conductance Ca(2+)‐activated K(+) channel K(Ca)1.1 plays a pivotal role in tumor development and progression in several solid cancers. The three‐dimensional (3D) in vitro cell culture system is a powerful tool for cancer spheroid formation, and mimics in vivo solid tumor resistance to chem...

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Autores principales: Ohya, Susumu, Kajikuri, Junko, Endo, Kyoko, Kito, Hiroaki, Elboray, Elghareeb E., Suzuki, Takayoshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8409426/
https://www.ncbi.nlm.nih.gov/pubmed/34181803
http://dx.doi.org/10.1111/cas.15046
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author Ohya, Susumu
Kajikuri, Junko
Endo, Kyoko
Kito, Hiroaki
Elboray, Elghareeb E.
Suzuki, Takayoshi
author_facet Ohya, Susumu
Kajikuri, Junko
Endo, Kyoko
Kito, Hiroaki
Elboray, Elghareeb E.
Suzuki, Takayoshi
author_sort Ohya, Susumu
collection PubMed
description The large‐conductance Ca(2+)‐activated K(+) channel K(Ca)1.1 plays a pivotal role in tumor development and progression in several solid cancers. The three‐dimensional (3D) in vitro cell culture system is a powerful tool for cancer spheroid formation, and mimics in vivo solid tumor resistance to chemotherapy in the tumor microenvironment (TME). K(Ca)1.1 is functionally expressed in osteosarcoma and chondrosarcoma cell lines. K(Ca)1.1 activator‐induced hyperpolarizing responses were significantly larger in human osteosarcoma MG‐63 cells isolated from 3D spheroid models compared with in those from adherent 2D monolayer cells. The present study investigated the mechanisms underlying the upregulation of K(Ca)1.1 and its role in chemoresistance using a 3D spheroid model. K(Ca)1.1 protein expression levels were significantly elevated in the lipid‐raft‐enriched compartments of MG‐63 spheroids without changes in its transcriptional level. 3D spheroid formation downregulated the expression of the ubiquitin E3 ligase FBXW7, which is an essential contributor to K(Ca)1.1 protein degradation in breast cancer. The siRNA‐mediated inhibition of FBXW7 in MG‐63 cells from 2D monolayers upregulated K(Ca)1.1 protein expression. Furthermore, a treatment with a potent and selective K(Ca)1.1 inhibitor overcame the chemoresistance of the MG‐63 and human chondrosarcoma SW‐1353 spheroid models to paclitaxel, doxorubicin, and cisplatin. Among several multidrug resistance ATP‐binding cassette transporters, the expression of the multidrug resistance‐associated protein MRP1 was upregulated in both spheroids and restored by the inhibition of K(Ca)1.1. Therefore, the pharmacological inhibition of K(Ca)1.1 may be an attractive new strategy for acquiring resistance to chemotherapeutic drugs in the TME of K(Ca)1.1‐positive sarcomas.
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spelling pubmed-84094262021-09-03 Ca(2+)‐activated K(+) channel K(Ca)1.1 as a therapeutic target to overcome chemoresistance in three‐dimensional sarcoma spheroid models Ohya, Susumu Kajikuri, Junko Endo, Kyoko Kito, Hiroaki Elboray, Elghareeb E. Suzuki, Takayoshi Cancer Sci Original Articles The large‐conductance Ca(2+)‐activated K(+) channel K(Ca)1.1 plays a pivotal role in tumor development and progression in several solid cancers. The three‐dimensional (3D) in vitro cell culture system is a powerful tool for cancer spheroid formation, and mimics in vivo solid tumor resistance to chemotherapy in the tumor microenvironment (TME). K(Ca)1.1 is functionally expressed in osteosarcoma and chondrosarcoma cell lines. K(Ca)1.1 activator‐induced hyperpolarizing responses were significantly larger in human osteosarcoma MG‐63 cells isolated from 3D spheroid models compared with in those from adherent 2D monolayer cells. The present study investigated the mechanisms underlying the upregulation of K(Ca)1.1 and its role in chemoresistance using a 3D spheroid model. K(Ca)1.1 protein expression levels were significantly elevated in the lipid‐raft‐enriched compartments of MG‐63 spheroids without changes in its transcriptional level. 3D spheroid formation downregulated the expression of the ubiquitin E3 ligase FBXW7, which is an essential contributor to K(Ca)1.1 protein degradation in breast cancer. The siRNA‐mediated inhibition of FBXW7 in MG‐63 cells from 2D monolayers upregulated K(Ca)1.1 protein expression. Furthermore, a treatment with a potent and selective K(Ca)1.1 inhibitor overcame the chemoresistance of the MG‐63 and human chondrosarcoma SW‐1353 spheroid models to paclitaxel, doxorubicin, and cisplatin. Among several multidrug resistance ATP‐binding cassette transporters, the expression of the multidrug resistance‐associated protein MRP1 was upregulated in both spheroids and restored by the inhibition of K(Ca)1.1. Therefore, the pharmacological inhibition of K(Ca)1.1 may be an attractive new strategy for acquiring resistance to chemotherapeutic drugs in the TME of K(Ca)1.1‐positive sarcomas. John Wiley and Sons Inc. 2021-07-16 2021-09 /pmc/articles/PMC8409426/ /pubmed/34181803 http://dx.doi.org/10.1111/cas.15046 Text en © 2021 The Authors. Cancer Science published by John Wiley & Sons Australia, Ltd on behalf of Japanese Cancer Association. https://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ (https://creativecommons.org/licenses/by-nc/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
spellingShingle Original Articles
Ohya, Susumu
Kajikuri, Junko
Endo, Kyoko
Kito, Hiroaki
Elboray, Elghareeb E.
Suzuki, Takayoshi
Ca(2+)‐activated K(+) channel K(Ca)1.1 as a therapeutic target to overcome chemoresistance in three‐dimensional sarcoma spheroid models
title Ca(2+)‐activated K(+) channel K(Ca)1.1 as a therapeutic target to overcome chemoresistance in three‐dimensional sarcoma spheroid models
title_full Ca(2+)‐activated K(+) channel K(Ca)1.1 as a therapeutic target to overcome chemoresistance in three‐dimensional sarcoma spheroid models
title_fullStr Ca(2+)‐activated K(+) channel K(Ca)1.1 as a therapeutic target to overcome chemoresistance in three‐dimensional sarcoma spheroid models
title_full_unstemmed Ca(2+)‐activated K(+) channel K(Ca)1.1 as a therapeutic target to overcome chemoresistance in three‐dimensional sarcoma spheroid models
title_short Ca(2+)‐activated K(+) channel K(Ca)1.1 as a therapeutic target to overcome chemoresistance in three‐dimensional sarcoma spheroid models
title_sort ca(2+)‐activated k(+) channel k(ca)1.1 as a therapeutic target to overcome chemoresistance in three‐dimensional sarcoma spheroid models
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8409426/
https://www.ncbi.nlm.nih.gov/pubmed/34181803
http://dx.doi.org/10.1111/cas.15046
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