Fusobacterium nucleatum confers chemoresistance by modulating autophagy in oesophageal squamous cell carcinoma

Yang Liu, Yoshifumi Baba, Takatsugu Ishimoto, Hiroyasu Tsutsuki, Tianli Zhang, Daichi Nomoto, Kazuo Okadome, Kensuke Yamamura, Kazuto Harada, Kojiro Eto, Yukiharu Hiyoshi, Masaaki Iwatsuki, Yohei Nagai, Shiro Iwagami, Yuji Miyamoto, Naoya Yoshida, Yoshihiro Komohara, Masaki Ohmuraya, Xiaoming Wang, Jaffer A. AjaniTomohiro Sawa, Hideo Baba

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

Background: Fusobacterium nucleatum (F. nucleatum) is a gut microbe implicated in gastrointestinal tumorigenesis. Predicting the chemotherapeutic response is critical to developing personalised therapeutic strategies for oesophageal cancer patients. The present study investigated the relationship between F. nucleatum and chemotherapeutic resistance in oesophageal squamous cell carcinoma (ESCC). Methods: We examined the relationship between F. nucleatum and chemotherapy response in 120 ESCC resected specimens and 30 pre-treatment biopsy specimens. In vitro studies using ESCC cell lines and co-culture assays further uncovered the mechanism underlying chemotherapeutic resistance. Results: ESCC patients with F. nucleatum infection displayed lesser chemotherapeutic response. The infiltration and subsistence of F. nucleatum in the ESCC cells were observed by transmission electron microscopy and laser scanning confocal microscopy. We also observed that F. nucleatum modulates the endogenous LC3 and ATG7 expression, as well as autophagosome formation to induce chemoresistance against 5-FU, CDDP, and Docetaxel. ATG7 knockdown resulted in reversal of F. nucleatum-induced chemoresistance. In addition, immunohistochemical studies confirmed the correlation between F. nucleatum infection and ATG7 expression in 284 ESCC specimens. Conclusions: F. nucleatum confers chemoresistance to ESCC cells by modulating autophagy. These findings suggest that targeting F. nucleatum, during chemotherapy, could result in variable therapeutic outcomes for ESCC patients.

Original languageEnglish (US)
Pages (from-to)963-974
Number of pages12
JournalBritish journal of cancer
Volume124
Issue number5
DOIs
StatePublished - Mar 2 2021

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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