Antitumor effect of WEE1 blockade as monotherapy or in combination with cisplatin in urothelial cancer

Overcoming cisplatin (CDDP) resistance is a major issue in urothelial cancer (UC), in which CDDP‐based chemotherapy is the first‐line treatment. WEE1, a G2/M checkpoint kinase, confers chemoresistance in response to genotoxic agents. However, the efficacy of WEE1 blockade in UC has not been reported...

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Veröffentlicht in:Cancer science 2021-09, Vol.112 (9), p.3669-3681
Hauptverfasser: Murakami, Kaoru, Kita, Yuki, Sakatani, Toru, Hamada, Akihiro, Mizuno, Kei, Nakamura, Kenji, Takada, Hideaki, Matsumoto, Keiyu, Sano, Takeshi, Goto, Takayuki, Akamatsu, Shusuke, Saito, Ryoichi, Tsuruyama, Tatsuaki, Ogawa, Osamu, Kobayashi, Takashi
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container_end_page 3681
container_issue 9
container_start_page 3669
container_title Cancer science
container_volume 112
creator Murakami, Kaoru
Kita, Yuki
Sakatani, Toru
Hamada, Akihiro
Mizuno, Kei
Nakamura, Kenji
Takada, Hideaki
Matsumoto, Keiyu
Sano, Takeshi
Goto, Takayuki
Akamatsu, Shusuke
Saito, Ryoichi
Tsuruyama, Tatsuaki
Ogawa, Osamu
Kobayashi, Takashi
description Overcoming cisplatin (CDDP) resistance is a major issue in urothelial cancer (UC), in which CDDP‐based chemotherapy is the first‐line treatment. WEE1, a G2/M checkpoint kinase, confers chemoresistance in response to genotoxic agents. However, the efficacy of WEE1 blockade in UC has not been reported. MK‐1775, a WEE1 inhibitor also known as AZD‐1775, blocked proliferation of UC cell lines in a dose‐dependent manner irrespective of TP53 status. MK‐1775 synergized with CDDP to block proliferation, inducing apoptosis and mitotic catastrophe in TP53‐mutant UC cells but not in TP53‐WT cells. Knocking down TP53 in TP53‐WT cells induced synergism of MK‐1775 and CDDP. In UMUC3 cell xenografts and two patient‐derived xenograft lines with MDM2 overexpression, in which the p53/cell cycle pathway was inactivated, AZD‐1775 combined with CDDP suppressed tumor growth inducing both M‐phase entry and apoptosis, whereas AZD‐1775 alone was as effective as the combination in RT4 cell xenografts. Drug susceptibility assay using an ex vivo cancer tissue‐originated spheroid system showed correlations with the in vivo efficacy of AZD‐1775 alone or combined with CDDP. We determined the feasibility of the drug susceptibility assay using spheroids established from UC surgical specimens obtained by transurethral resection. In conclusion, WEE1 is a promising therapeutic target in the treatment of UC, and a highly specific small molecule inhibitor is currently in early phase clinical trials for cancer. Differential antitumor efficacy of WEE1 blockade alone or combined with CDDP could exist according to p53/cell cycle pathway activity, which might be predictable using an ex vivo 3D primary culture system. WEE1 inhibitor and cisplatin (CDDP) in combination was significantly more effective than the single treatments. Drug susceptibility assay using an ex vivo cancer tissue‐originated spheroid system showed correlations with the in vivo efficacy of AZD‐1775 alone or combined with CDDP.
doi_str_mv 10.1111/cas.15051
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WEE1, a G2/M checkpoint kinase, confers chemoresistance in response to genotoxic agents. However, the efficacy of WEE1 blockade in UC has not been reported. MK‐1775, a WEE1 inhibitor also known as AZD‐1775, blocked proliferation of UC cell lines in a dose‐dependent manner irrespective of TP53 status. MK‐1775 synergized with CDDP to block proliferation, inducing apoptosis and mitotic catastrophe in TP53‐mutant UC cells but not in TP53‐WT cells. Knocking down TP53 in TP53‐WT cells induced synergism of MK‐1775 and CDDP. In UMUC3 cell xenografts and two patient‐derived xenograft lines with MDM2 overexpression, in which the p53/cell cycle pathway was inactivated, AZD‐1775 combined with CDDP suppressed tumor growth inducing both M‐phase entry and apoptosis, whereas AZD‐1775 alone was as effective as the combination in RT4 cell xenografts. Drug susceptibility assay using an ex vivo cancer tissue‐originated spheroid system showed correlations with the in vivo efficacy of AZD‐1775 alone or combined with CDDP. We determined the feasibility of the drug susceptibility assay using spheroids established from UC surgical specimens obtained by transurethral resection. In conclusion, WEE1 is a promising therapeutic target in the treatment of UC, and a highly specific small molecule inhibitor is currently in early phase clinical trials for cancer. Differential antitumor efficacy of WEE1 blockade alone or combined with CDDP could exist according to p53/cell cycle pathway activity, which might be predictable using an ex vivo 3D primary culture system. WEE1 inhibitor and cisplatin (CDDP) in combination was significantly more effective than the single treatments. 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WEE1, a G2/M checkpoint kinase, confers chemoresistance in response to genotoxic agents. However, the efficacy of WEE1 blockade in UC has not been reported. MK‐1775, a WEE1 inhibitor also known as AZD‐1775, blocked proliferation of UC cell lines in a dose‐dependent manner irrespective of TP53 status. MK‐1775 synergized with CDDP to block proliferation, inducing apoptosis and mitotic catastrophe in TP53‐mutant UC cells but not in TP53‐WT cells. Knocking down TP53 in TP53‐WT cells induced synergism of MK‐1775 and CDDP. In UMUC3 cell xenografts and two patient‐derived xenograft lines with MDM2 overexpression, in which the p53/cell cycle pathway was inactivated, AZD‐1775 combined with CDDP suppressed tumor growth inducing both M‐phase entry and apoptosis, whereas AZD‐1775 alone was as effective as the combination in RT4 cell xenografts. 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Drug susceptibility assay using an ex vivo cancer tissue‐originated spheroid system showed correlations with the in vivo efficacy of AZD‐1775 alone or combined with CDDP.</abstract><cop>Tokyo</cop><pub>John Wiley &amp; Sons, Inc</pub><pmid>34212455</pmid><doi>10.1111/cas.15051</doi><tpages>13</tpages><orcidid>https://orcid.org/0000-0002-4226-3867</orcidid><orcidid>https://orcid.org/0000-0003-1069-2816</orcidid><oa>free_for_read</oa></addata></record>
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subjects Antimitotic agents
Antineoplastic agents
Antitumor activity
Apoptosis
Bladder cancer
Cancer
Cancer therapies
Cell culture
Cell cycle
Cell proliferation
Chemoresistance
Chemotherapy
Cisplatin
Clinical trials
Cyclin-dependent kinases
Disease susceptibility
DNA damage
DNA repair
Gene expression
Genotoxicity
Health aspects
Kinases
MDM2 protein
Original
p53
Patients
Spheroids
Tumor proteins
Tumors
Urothelial cancer
WEE1
Xenografts
title Antitumor effect of WEE1 blockade as monotherapy or in combination with cisplatin in urothelial cancer
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