Abstract
Purpose
Prostate cancer can undergo curative effects by radical prostatectomy or radical radiotherapy. However, the best treatment for more aggressive high-risk prostate cancer remains controversial. Insufficient infiltration capacity and dysfunction are commonly occurrences in engineered T lymphocytes expressing chimeric antigen receptor (CAR-T), characterizing cancer immunotherapy failure. We conducted this study to investigate whether the combinative application of docetaxel and PSMA-CAR-T cells could be a more effective treatment to prostate cancer.
Methods
Expressions of prostate specific membrane antigen (PSMA) on prostate cancer cells were examined by Flow cytometry. The efficaciousness of PSMA-CAR-T was evaluated in vitro using ELISA and RTCA. The effect of intermixed therapy was assessed in vivo utilizing a human prostate cancer liver metastasis mouse model and a human prostate cancer cell xenograft mouse model.
Results
The outcome of cytokine discharge and cell killing assays demonstrated that PSMA-CAR-T cells have characteristic effector capacity against PSMA+ prostate cancer cells in vitro. Additionally, collaborative treatment of PSMA-CAR-T cells and docetaxel have cooperative efficacy in a mouse model of human prostate cancer. The merged strategy could be seen as an undeveloped avenue to augmenting adoptive CAR-T cell immunotherapy and mitigating the adverse side effects of chemotherapy.
Conclusions
Cooperation of PSMA-specific CAR-T cells and the chemotherapy drug docetaxel can impressively ameliorate antitumor effectiveness against an installed metastatic human prostate cancer model in NPG mice.
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Data availability
All data are available in the main text or the supplementary materials.
Abbreviations
- ADT:
-
Androgen replacement therapy
- CAR-T:
-
Chimeric antigen receptor T cell
- CRPC:
-
Castration-resistant prostate cancer
- DTX:
-
Docetaxel
- HMGB1:
-
High mobility group protein B1
- PSMA:
-
Prostate specific membrane antigen
- MDSCs:
-
Myeloid-derived suppressor cells
- TAMs:
-
Tumor-associated macrophages
- Tregs:
-
Regulatory T cells
- RTCA:
-
Real time cell analysis
- ELISA:
-
Enzyme linked immunosorbent assay
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Funding
This work was supported by grants from the National Science Foundation of China (81773253, 81972242), Natural Science Foundation of Jiangsu Province (BK20211057), the Youth Technology Innovation Team of Xuzhou Medical University (TD202003), the Jiangsu Provincial Key Medical Discipline, and the Project of Invigorating Health Care through Science, Technology and Education (ZDXKA2016014), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (19KJB310001, 19KJB310018, 18KJA320013), the Natural Science Key Project of Jiangsu Provincial Education Department (20KJA320006), Six talent peaks project in Jiangsu Province (WSW-064), Xuzhou Science and Technology Bureau projects grant (KC19058), the Research Foundation of Xuzhou Medical University (D2019023), the Qing Lan Project of Jiangsu Province to XG.
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Conceptualization, JZ and QZ; methodology, XG, JS; software, HL; validation, XZ, SS, and YM; formal analysis, YY, WZ; investigation, XZ, SS, YM, XW, CH and XH; resources, QZ and JZ; data curation, XZ, and BW; writing—original draft preparation, XZ; writing—review and editing, SS, and QZ; visualization, HX, WZ; supervision, JZ and QZ; project administration, JZ and QZ; funding acquisition, HL, SS, XG, JS, JZ and QZ. All authors have read and agreed to the published version of the manuscript.
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Supplementary file1 (DOCX 136 KB) Supplementary Fig. 1
Ex Vivo Docetaxel Existing Does Not Notably Spoil Expanding and Killing Capacity of PSMA-CAR-T Cells. A, Influence of docetaxel on the expanding of PSMA-CAR-T cells by cell counting. B, Influence of docetaxel on the cytokine release of PSMA-CAR-T cells by ELISA. C, Influence of docetaxel on the cytotoxic capacity of PSMA-CAR-T cells. PSMA-CAR-T cells were pretreated with docetaxel for 48 hours. *P<0.05; ns, not significant.
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Zhang, X., Sun, S., Miao, Y. et al. Docetaxel enhances the therapeutic efficacy of PSMA-specific CAR-T cells against prostate cancer models by suppressing MDSCs. J Cancer Res Clin Oncol 148, 3511–3520 (2022). https://doi.org/10.1007/s00432-022-04248-y
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DOI: https://doi.org/10.1007/s00432-022-04248-y