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• W2885022606 abstract "Background: Fusobacterium nucleatum is an oral bacteria that contributes to oral carcinogenesis. Its potential role in oral cancer is not known. Fusobacterium nucleatum (henceforth FN) is a gram-negative anaerobe associated with periodontal diseases and also colon cancer. The bacteria modulates the host cell signaling mechanism including the activation of beta-catenin signaling and p38 pathway. The Fap2 is the outer membrane proteins of FN that inhibit lymphocytes and NK cells. The bacteria also directly binds to NKp46 receptor of NK cells. These properties of FN may be exploited by oral CSCs to defend their own niche as a part of niche-defense mechanism against immune system. Hence, it is not surprising that oral CSCs may hijack this specific oral bacterium to enhance tumor stemness. We speculate that oral CSCs may hijack specific bacteria type present in oral mucosa, and enhance their stemness-inducing mechanisms to switch non-CSCs to CSCs. Methods: We have established an in vitro model of oral cancer cells/FN host/pathogen interaction model. Using this model, we wanted to study potential role of the bacteria in cancer stemness. We also used the saliva of subjects with oral cancer to infect oral cancer stem cells and non-stem cancer cells. Results: When the SCC-25 oral cancer cell line was treated with the saliva of subjects with oral cancer, the EpCAM+/ABCG2+ oral CSCs population was increased and showed the presence of FN. The FN recovered from CSCs exhibited high expression of FadA and Fap2, two surface proteins present in FN that can modulate signaling pathways of host cells. Importantly, FN recovered from the infected CSCs induced stemness in the non-stem cancer cell population of SCC-25, suggesting that CSCs may modulate the pathogen. Indeed, our preliminary observation indicates that FN recovered from the FN strain ATCC 25586 infected SCC-25 ABCG2+ cells showed increased expression of FADA and Fap2 as compared to the parental strain ATCC 25586. Conclusion: Our data suggests that CSCs have the capability to reprogram F. nucleatum genome in order to make the bacteria a potent inducer of tumor stemness in non-stem cancer cells. Citation Format: Bidisha Pal, Seema Bhuyan, Debabrat Baishya, Bikul Das. Oral cancer stem cells modulate Fusobacterium nucleatum to acquire the capability to induce tumor stemness switch [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2018; 2018 Apr 14-18; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2018;78(13 Suppl):Abstract nr 3064." @default.
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• W2885022606 date "2018-07-01" @default.
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• W2885022606 title "Abstract 3064: Oral cancer stem cells modulateFusobacterium nucleatumto acquire the capability to induce tumor stemness switch" @default.
• W2885022606 doi "https://doi.org/10.1158/1538-7445.am2018-3064" @default.
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