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Jingushi, Kentaro; Kawashima, Atsunari; Tanikawa, Sayaka; Saito, Takuro; Yamamoto, Akinaru; Uemura, Toshihiro; Sassi, Nesrine; Ishizuya, Yu; Yamamoto, Yoshiyuki; Kato, Taigo; Hatano, Koji; Hase, Hiroaki; Nonomura, Norio; Tsujikawa, Kazutake
Cancer science, August 2024, Volume: 115, Issue: 8Journal Article
Bacterial flora are present in various parts of the human body, including the intestine, and are thought to be involved in the etiology of various diseases such as multiple sclerosis, intestinal diseases, cancer, and uterine diseases. In recent years, the presence of bacterial 16S rRNA genes has been revealed in blood, which was previously thought to be a sterile environment, and characteristic blood microbiomes have been detected in various diseases. However, the mechanism and the origin of the bacterial information are unknown. In this study, we performed 16S rRNA metagenomic analysis of bacterial DNA in serum extracellular vesicles from five healthy donors and seven patients with renal cell carcinoma and detected Cutibacterium acnes DNA as a characteristic bacterial DNA in the serum extracellular vesicles of patients with renal cell carcinoma. In addition, C. acnes DNA was significantly reduced in postoperative serum extracellular vesicles from patients with renal cell carcinoma compared with that in preoperative serum extracellular vesicles from these patients and was also detected in tumor tissue and extracellular vesicles from tumor tissue‐associated microbiota, suggesting an association between C. acnes extracellular vesicles and renal cell carcinoma. C. acnes extracellular vesicles were taken up by renal carcinoma cells to enhance their proliferative potential. C. acnes extracellular vesicles also exhibited tumor‐promoting activity in a mouse model of renal cancer allografts with enhanced angiogenesis. These results suggest that extracellular vesicles released by C. acnes localized in renal cell carcinoma tissues act in a tumor‐promoting manner. Propionibacterium acnes DNA is enriched in the serum extracellular vesicles of patients with renal cell carcinoma. P. acnes extracellular vesicles promote tumor growth of renal cell carcinoma.
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