Journal: Nature Communications
Article Title: Breast cancer colonization by Fusobacterium nucleatum accelerates tumor growth and metastatic progression
Figure Lengend Snippet: F. nucleatum ATCC 23726 accelerates tumor growth and progression of lung metastasis. a Experimental scheme: AT3 breast cancer cell line was injected to the mammary fat pad of 6–7-week-old C57BL/6 mice. When tumor size reached 500 mm 3 , PBS vehicle (V), 5 × 10 7 F. nucleatum ATCC 23726 only (726), 5 × 10 7 F. nucleatum ATCC 23726 with metronidazole (726+MTZ.), metronidazole only (MTZ.), or 5 × 10 7 Fap2-deficient F. nucleatum K50 were injected into the tail vein. On days 2–3 post inoculation, mice were injected twice a day with metronidazole (M) or with PBS vehicle (V). On days 4–7 post inoculation, mice were injected once a day with metronidazole or with PBS. Eight days after inoculation, mice were sacrificed, and tumor and lungs harvested. Breast cancer tissues were weighed, and lung metastases were counted. b Tumor weights normalized as the percentage compared with the average tumor weight in the PBS group (vehicle control) in each experiment (set as 100% tumor weight). Each symbol represents one mouse. Presented results are of three independent experiments. **** p = 3.48 × 10 −5 , ** p = 0.002. Holm’s correction, one-tailed Mann–Whitney. Vehicle n = 21, MTZ. n = 17, K50 n = 7, 726 n = 19, 726+MTZ. n = 12. c Representative tumors post-harvest. d Representative image of lung metastases. Scale bar, 500 µm in the large image, 250 µm in the indicated inset. e Lung metastasis rank [number of metastases per lung area (pixel 2 )] calculated as percentage compared with the average metastasis rank in the vehicle control group of each experiment (set as 100% metastasis rank). Each symbol represents one mouse. Presented results are of three independent experiments. **** p = 4.08 × 10 −5 , * p = 0.0177, n.s.: non-significant, Holm’s correction, one-tailed Mann–Whitney. Vehicle n = 20, MTZ. n = 17, K50 n = 7, 726 n = 18, 726+met n = 12. f Images taken by fluorescence binocular of lung metastases in four mice implanted with GFP-expressing AT3 cells as described above. Two tumor-bearing mice were inoculated with F. nucleatum and two were treated by PBS vehicle. Scale bar, 1000 µm. Source data are provided as a Source data file.
Article Snippet: Supporting the predicted Fap2-mediated recognition of Gal-GalNAc, wild-type F. nucleatum ATCC 23726 showed significantly higher attachment than the K50 and D22 mutants (Fig. ).
Techniques: Injection, Mouse Assay, One-tailed Test, MANN-WHITNEY, Fluorescence, Expressing