Journal: Scientific Reports
Article Title: Exploring the effect of canine cancer-associated fibroblasts on T cell dynamics through the CXCL12/CXCR4 axis modulated by TGF-β1
doi: 10.1038/s41598-025-16312-x
Figure Lengend Snippet: CAFs attract CD8⁺ T cells through the CXCL12/CXCR4 axis. ( A ) Schematic of the Boyden-chamber migration assay. CXCR4⁺CD8⁺ T cells were seeded in the upper compartment; the lower compartment contained control medium, recombinant CXCL12 (100 ng/mL) or CAF-CM. Migrated cells were counted after 24 h. ( B ) Migration toward recombinant CXCL12, expressed as fold change versus control. Mean ± SD ( n = 3). ( C ) Migration toward CAF-CM, expressed as fold change versus control. Mean ± SD ( n = 3). Control, culture medium; AMD3100, 4 µM CXCR4 inhibitor. ( D ) Schematic of the adhesion assay using a cell culture insert in a 6 cm dish. CAFs and tumor cells (RCM-SO or NMTCC) were plated on opposite sides of the insert and cultured for 24 h; the insert was then removed and CXCR4⁺ T cells added for a further 24 h. ( E ) Density of T cells adhered per cm 2 to cancer cell lines versus CAFs after 24 h. Mean ± SD ( n = 4). RCM-SO, canine mammary gland carcinoma cell line; NMTCC, canine transitional cell carcinoma cell line. ( F ) IHC of serial sections from a canine pulmonary adenocarcinoma stained for CXCL12 (top) and CD3 (bottom). Dashed lines delineate stromal and tumor cell areas, and asterisks (*) indicate the stromal regions. Scale bars 50 µm ( G ) CD3⁺ T cell density in stromal and tumor regions of thyroid carcinoma (TC, n = 2) and pulmonary adenocarcinoma (LC, n = 4). Numbers after histo-type indicate CXCL12 expression score. Mean ± SD. ( H ) Ratio of stromal to tumor CD3⁺ T cell density in each case. * P < 0.05, ** P < 0.01, *** P < 0.001, **** P < 0.0001.
Article Snippet: In addition, cells were stained with the following directly fluorochrome-conjugated anti-canine antibodies: FITC-conjugated mouse anti-dog CD3 (clone CA17.2A12; Bio-Rad Laboratories), PE-conjugated anti-CD4 antibody (clone YKIX302.9, Bio-Rad Laboratories) and APC-conjugated rat anti-dog CD8 (clone YCATE 55.9; Thermo Fisher Scientific).
Techniques: Migration, Control, Recombinant, Cell Adhesion Assay, Cell Culture, Staining, Expressing