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Xu D, Wang L, Wieczorek K, Zhang Y, Wang Z, Wang J, Xu B, Singh PK, Wang Y, Zhang X, Wu Y, Smith GJ, Attwood K, Zhang Y, Goodrich DW, Li Q. Single-Cell Analyses of a Novel Mouse Urothelial Carcinoma Model Reveal a Role of Tumor-Associated Macrophages in Response to Anti-PD-1 Therapy. Cancers (Basel) 2022; 14:cancers14102511. [PMID: 35626115 PMCID: PMC9139541 DOI: 10.3390/cancers14102511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 05/10/2022] [Accepted: 05/18/2022] [Indexed: 02/04/2023] Open
Abstract
Approximately 80% of patients with advanced bladder cancer do not respond to immune checkpoint inhibitor (ICI) immunotherapy. Therefore, there is an urgent unmet need to develop clinically relevant preclinical models so that factors governing immunotherapy responses can be studied in immunocompetent mice. We developed a line of mouse triple knockout (TKO: Trp53, Pten, Rb1) urothelial carcinoma organoids transplanted into immunocompetent mice. These bladder tumors recapitulate the molecular phenotypes and heterogeneous immunotherapy responses observed in human bladder cancers. The TKO organoids were characterized in vivo and in vitro and compared to the widely used MB49 murine bladder cancer model. RNAseq analysis of the TKO tumors demonstrated a basal subtype. The TKO xenografts demonstrated the expression of urothelial markers (CK5, CK7, GATA3, and p63), whereas MB49 subcutaneous xenografts did not express urothelial markers. Anti-PD-1 immunotherapy resulted in a mixed pattern of treatment responses for individual tumors. Eight immune cell types were identified (basophils, B cells, dendritic cells, macrophages, monocytes, neutrophils, NK cells, and T cells) in ICI-treated xenografts. Responder xenografts displayed significantly increased immune cell infiltration (15.3%, 742 immune cells/4861 total cells) compared to the non-responder tumors (10.1%, 452 immune cells/4459 total cells, Fisher Exact Test p < 0.0001). Specifically, there were more T cells (1.0% vs. 0.4%, p = 0.002) and macrophages (8.6% vs. 6.4%, p = 0.0002) in responder xenografts than in non-responder xenografts. In conclusion, we have developed a novel preclinical model that exhibits a mixed pattern of response to anti-PD-1 immunotherapy. The higher percentage of macrophage tumor infiltration in responders suggests a potential role for the innate immune microenvironment in regulating ICI treatment responses.
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Affiliation(s)
- Dongbo Xu
- Department of Urology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (D.X.); (L.W.); (K.W.); (Y.W.); (G.J.S.)
| | - Li Wang
- Department of Urology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (D.X.); (L.W.); (K.W.); (Y.W.); (G.J.S.)
| | - Kyle Wieczorek
- Department of Urology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (D.X.); (L.W.); (K.W.); (Y.W.); (G.J.S.)
| | - Yali Zhang
- Department of Biostatistics & Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (Y.Z.); (J.W.); (K.A.)
| | - Zinian Wang
- Departments of Cancer Prevention and Control, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA;
| | - Jianmin Wang
- Department of Biostatistics & Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (Y.Z.); (J.W.); (K.A.)
| | - Bo Xu
- Departments of Pathology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA;
| | - Prashant K. Singh
- Departments of Cancer Genetics & Genomics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA;
| | - Yanqing Wang
- Department of Pharmacology & Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (Y.W.); (X.Z.); (Y.Z.); (D.W.G.)
| | - Xiaojing Zhang
- Department of Pharmacology & Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (Y.W.); (X.Z.); (Y.Z.); (D.W.G.)
| | - Yue Wu
- Department of Urology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (D.X.); (L.W.); (K.W.); (Y.W.); (G.J.S.)
| | - Gary J. Smith
- Department of Urology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (D.X.); (L.W.); (K.W.); (Y.W.); (G.J.S.)
| | - Kristopher Attwood
- Department of Biostatistics & Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (Y.Z.); (J.W.); (K.A.)
| | - Yuesheng Zhang
- Department of Pharmacology & Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (Y.W.); (X.Z.); (Y.Z.); (D.W.G.)
| | - David W. Goodrich
- Department of Pharmacology & Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (Y.W.); (X.Z.); (Y.Z.); (D.W.G.)
| | - Qiang Li
- Department of Urology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (D.X.); (L.W.); (K.W.); (Y.W.); (G.J.S.)
- Department of Pharmacology & Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA; (Y.W.); (X.Z.); (Y.Z.); (D.W.G.)
- Correspondence: ; Tel.: +1-716-845-3389; Fax: +1-716-845-3300
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