Abstract
Because a host’s immune system is affected by host–microbiota interactions, means of modulating the microbiota could be leveraged to augment the effectiveness of cancer therapies. Here we report that patients with oral squamous cell carcinoma (OSCC) whose tumours contained higher levels of bacteria of the genus Peptostreptococcus had higher probability of long-term survival. We then show that in mice with murine OSCC tumours injected with oral microbiota from patients with OSCCs, antitumour responses were enhanced by the subcutaneous delivery of an adhesive hydrogel incorporating silver nanoparticles (which inhibited the growth of bacteria competing with Peptostreptococcus) alongside the intratumoural delivery of the bacterium P. anaerobius (which upregulated the levels of Peptostreptococcus). We also show that in mice with subcutaneous or orthotopic murine OSCC tumours, combination therapy with the two components (nanoparticle-incorporating hydrogel and exogenous P. anaerobius) synergized with checkpoint inhibition with programmed death-1. Our findings suggest that biomaterials can be designed to modulate human microbiota to augment antitumour immune responses.
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Data availability
The main data supporting the findings of this study are available within the paper and its Supplementary Information. The raw and analysed datasets generated during the study are too large to be publicly shared, but they are available for research purposes from the corresponding authors on reasonable request. Source data for Figs. 4 and 5, and Extended Data Fig. 2 are provided with this paper. Eukaryotic transcriptome and bacterial 16 S rRNA sequencing data are available from the NCBI Sequence Read Archive (accession numbers: PRJNA759007 and PRJNA758237).
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2019YFA0905603) and the National Natural Science Foundation of China (51833007, 51988102, 51690152 and 81874131). We thank Q.-M. Chen (Sichuan University, P. R. China) for the kind gift of the SCC7 cell lines, and the Wuhan Institute of Biotechnology (Wuhan, P. R. China) for the technical support. 4MOSC1 and 4MOSC2 cells were kindly gifted by S. Gutkind (University of California, San Diego, USA) through the material transfer agreement (SD2017-202).
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D.-W.Z., W.-W.D., Z.J.S. and X.-Z.Z. conceived the project and designed the experiments. D.-W.Z., W.-F.S. and S.H. synthesized materials. W.-F.S. performed in vitro microbiological experiments. D.-W.Z., W.-W.D. and H.C. collected and analysed the data. C.-C.W. and W.-W.D. performed in vitro cell experiments. W.-W.D., J.L. and W.-F.S. performed in vivo experiments. D.-W.Z., W.-W.D., W.-F.S., Z.-N.Z., Z.-J.S. and X.-Z.Z. co-wrote the manuscript. All authors discussed the results and reviewed the manuscript.
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Peer review information Nature Biomedical Engineering thanks Christian Jobin, Zhuang Liu and Bo Xiao for their contribution to the peer review of this work.
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Extended data
Extended Data Fig. 1 Peptostreptococcus in tumours of OSCC patients.
Another FISH probe (TAATGACGGTACCCTGTGAG) of Peptostreptococcus was used. a, Scatter plots of the genus Peptostreptococcus in tumours (n = 181), dysplasia (n = 54) and paracancerous tissues (n = 31) from OSCC patients. b, The Kaplan-Meier survival curves of cancer-specific survival of OSCC patients according to intratumoural Peptostreptococcus status. Patients were divided into high (n = 84) and low (n = 85) groups based on the Peptostreptococcus count. c, Linear regression of intratumoural P. anaerobius level versus the quantification of CD8 using serial tissue microarrays. Significance between groups was calculated using one-way ANOVA with Tukey post-hoc test (a), Log-rank (Mantel-Cox) test (b), or linear regression analysis (c). 22 samples were missing in the tissue microarrays and 8 samples lost follow-up records. Data are mean ± s.d.
Extended Data Fig. 2 Anti-cancer mechanism of Peptostreptococcus.
a, Anti-cancer effect of P. anaerobius in SCC7-tumour bearing female C3H mice (n = 4). 4 × 107 CFU of P. anaerobius was subcutaneously injected into mice at the day 1. b, Anti-cancer effect of P. anaerobius in SCC7-tumour bearing female BALB/c nude mice (n = 4). 4 × 107 CFU of P. anaerobius was subcutaneously injected into mice at the day 1. Significance between two groups was calculated using two-tailed Student’s t-test. c, Timeline of the in vivo anti-cancer mechanism study. Female C3H mice or BALB/c nude mice were used for this experiment. d, Capacity of AgNP in promoting the anti-cancer effect of P. anaerobius in SCC-7 tumour-bearing mice (n = 4) with patients’ oral microbiota. e, Intratumoural Peptostreptococcus levels of mice (n = 3) after receiving various treatments as indicated. f, The effect of Agel + Pa in inhibiting orthotopic 4MOSC1 tumours (n = 5). Two mice in the Saliva + Agel group died during the treatment. g, Representative results for the DCs maturation in 4MOSC1-tumour bearing mice. Significance among groups was calculated using two-tailed Student’s t-test (a, b, f) or one-way ANOVA with Tukey post-hoc test (d, e). Data are mean ± s.d., and n represents the number of biologically independent samples.
Extended Data Fig. 3 Effect of P. anaerobius on the murine OSCC model induced by 4-NQO.
a, Timeline for treatment of C57BL/6 mice with 4-NQO-induced spontaneous OSCC. b, Images of tongue of mice after receiving PBS, P. anaerobius or P. anaerobius + aPD1 treatment (n = 5). Red arrows indicate the tumour-like nodules. c, Quantitative count for the number of SCC (in situ carcinoma + invasive carcinoma and dysplasia from the tissues. The analysis was performed on the pathological section of the tongue of each mouse. d, Flow cytometric quantification for the level of CD8+ T cells (CD3+ CD8+) from draining lymph nodes (n = 5). The tissue samples were collected at the 21st week. Significance between groups was calculated using one-way ANOVA with LSD post-hoc test. Data are mean ± s.d., and n represents the number of biologically independent samples.
Extended Data Fig. 4 Changes of gut microbiota after the 12-week of Agel treatment.
C57BL/6 mice were given Agel (3.4 mg kg−1) once a week for 12 weeks. Each time, 100 μL of Agel or PBS was evenly applied to the oral cavity of the mice. 16 S rDNA analysis was used to analyse the gut microbiota of treated mice. a, Venn diagram for the alteration in gut microbiota after treated with Agel or PBS for 12 weeks, respectively (n = 3). b, Heatmap for visualizing the content of bacteria genera between different groups (n = 3). c, Principal component analysis (PCA) for the gut microbiota structure profile between different groups (n = 3). One-way PERMANOVA P = 0.1. d, Wilcoxon rank-sum test bar plot on genus level. Plots showing the relative abundances of the top 15 differentially abundant genera in Agel and PBS treated gut microbiota (n = 3). Data are mean ± s.d.
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Zheng, DW., Deng, WW., Song, WF. et al. Biomaterial-mediated modulation of oral microbiota synergizes with PD-1 blockade in mice with oral squamous cell carcinoma. Nat Biomed Eng 6, 32–43 (2022). https://doi.org/10.1038/s41551-021-00807-9
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DOI: https://doi.org/10.1038/s41551-021-00807-9
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