(A) Representative cytometry of tumor APCs in PyMTchOVA x Cx3cr1-eGFP x Cd11c-mCherry. Populations as previously defined, are plotted as mCherry vs. GFP. Green, Yellow and Red circles indicate the fluorescent profile each population displays in this model. Red (mCherry only cells), Yellow (mCherry and GFP double positive cells), and Green (GFP only cells). By flow cytometry DC1/DC2 populations fall in the Cherry-only population, while TAM1 and TAM2 comprise the yellow and green populations respectively.
(B) Intravital 2-photon representative still image of an early carcinoma lesion from a PyMTchOVA x Cx3cr1-eGFP x Cd11c-mCherry reporter. Regions indicated with dashed line, marked either distal or marginating to lesions, were determined with a combination of mCherry fluorescence and collagen structure. Collagen fibers marked (white) by 2nd harmonic generation. Scale bar 50 μm. Inset: Quantification of Proximal/distal location of the APCs within the tumor. Data pooled from independent imaging runs, presented as mean ± SEM.
(C) Representative confocal still image from live tumor slices in PyMTchOVA x Cx3cr1-eGFP x Cd11cmCherry tumors, stained with CD11b-A647 antibody. mCherry only cell (arrowhead DC2, red) and mCherry+ CD11b+ cell (arrow DC1, purple) in the tumor. Scale bar 15 μm.
(D) Representative image sequence of CFP expressing OT-1 CD8+ T cells (blue) dynamically interacting with APC cells in the PyMTchOVA x Cx3cr1-eGFP x Cd11c-mCherry model by live slice confocal imaging 4 days after T cell transfer at 0, 30 and 60 min. Arrows indicate T cell interactions with Red (DC1/DC2), Green (TAM1) or Yellow (TAM2) cells. Scale bar 30 μm. Last panel displays time projection of CFP expressing T cells through 60 min imaging timeframe, with outline color dictated by APC of contact.
(E) APC-T cell contacts in vivo as a % of total T cell couples observed. Accumulated data of 4 different positions imaged for 30 minutes in 2 independent intravital 2 photon imaging runs. Contacts were scored manually by counting physical contact made between T cells and red, yellow and green APCs. Color of bar represents the APC of contact (Red: CD103+, CD11b+ DC1, Green: TAM1, yellow: TAM2).
(F) Ex vivo T cell coupling assay with digested tumor positively selected for CD45+ cells with previously activated OT-I CD8+ T cell. Data calculated as % of T cells couples within each of the populations (left), and as a total % of T cell couples (right). Data pooled from 2 independent experiments, plotted as mean ± SEM.
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