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Combination of Cisplatin and Irradiation Induces Immunogenic Cell Death and Potentiates Postirradiation Anti–PD-1 Treatment Efficacy in Urothelial Carcinoma

Department of Urology, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
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Int. J. Mol. Sci. 2021, 22(2), 535; https://doi.org/10.3390/ijms22020535
Received: 19 December 2020 / Revised: 2 January 2021 / Accepted: 5 January 2021 / Published: 7 January 2021
(This article belongs to the Special Issue Immunotherapy for Hematological and Solid Cancers)
The therapeutic benefit of immune checkpoint inhibitor monotherapy is limited to a subset of patients in urothelial carcinoma (UC). Previous studies showed the immunogenicity of cisplatin and irradiation. Here, we investigated whether chemoradiotherapy (CRT), a combination of cisplatin and irradiation, could improve the efficacy of postirradiation anti–programmed cell death 1 (PD-1) treatment in UC. In our advanced UC patient cohort, patients with CRT showed a significantly better objective response rate (75%/22%) and overall survival (88%/30% at 12 months) following later pembrolizumab therapy compared to those without. Then, we created syngeneic UC mouse models by inoculating MB49 cells s.c. in C57BL/6J mice to examine the potential of CRT to enhance antitumor immunity in conjunction with postirradiation anti–PD-1 treatment. Nonirradiated tumors of the mice treated with CRT/postirradiation anti–PD-1 treatment had a significantly slower growth rate and a significantly higher expression of cytotoxic T cells compared to those of the mice treated with anti–PD-1 treatment alone. The mice treated with CRT/postirradiation anti–PD-1 treatment showed the best survival. Mechanistically, CRT provoked strong direct cytotoxicity and increased expressions of immunogenic cell death markers in MB49 cells. Therefore, the combination of cisplatin and irradiation induces immunogenic cell death and potentiates postirradiation anti–PD-1 treatment efficacy in UC. View Full-Text
Keywords: chemoradiotherapy; cisplatin; immunotherapy; carcinoma; transitional cell; immunogenic cell death chemoradiotherapy; cisplatin; immunotherapy; carcinoma; transitional cell; immunogenic cell death
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MDPI and ACS Style

Fukushima, H.; Yoshida, S.; Kijima, T.; Nakamura, Y.; Fukuda, S.; Uehara, S.; Yasuda, Y.; Tanaka, H.; Yokoyama, M.; Matsuoka, Y.; Fujii, Y. Combination of Cisplatin and Irradiation Induces Immunogenic Cell Death and Potentiates Postirradiation Anti–PD-1 Treatment Efficacy in Urothelial Carcinoma. Int. J. Mol. Sci. 2021, 22, 535. https://doi.org/10.3390/ijms22020535

AMA Style

Fukushima H, Yoshida S, Kijima T, Nakamura Y, Fukuda S, Uehara S, Yasuda Y, Tanaka H, Yokoyama M, Matsuoka Y, Fujii Y. Combination of Cisplatin and Irradiation Induces Immunogenic Cell Death and Potentiates Postirradiation Anti–PD-1 Treatment Efficacy in Urothelial Carcinoma. International Journal of Molecular Sciences. 2021; 22(2):535. https://doi.org/10.3390/ijms22020535

Chicago/Turabian Style

Fukushima, Hiroshi, Soichiro Yoshida, Toshiki Kijima, Yuki Nakamura, Shohei Fukuda, Sho Uehara, Yosuke Yasuda, Hajime Tanaka, Minato Yokoyama, Yoh Matsuoka, and Yasuhisa Fujii. 2021. "Combination of Cisplatin and Irradiation Induces Immunogenic Cell Death and Potentiates Postirradiation Anti–PD-1 Treatment Efficacy in Urothelial Carcinoma" International Journal of Molecular Sciences 22, no. 2: 535. https://doi.org/10.3390/ijms22020535

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