Metastatic-like tumors were established in C57BL/6 mice (Jackson Laboratory strain 00664), Rag−/− (Jackson Laboratory strain 002216), or IFNγ−/− (Jackson Laboratory strain 002287), as indicated, by intravenous injection of 3×105 B16-F10 (B16) melanoma cells. B16 cells were obtained from ATCC (CRL-6475), and tumors were established from cryo-preserved stocks that had been passaged less than two times. Tumor development was observed in 100% of injected mice.
Inducible melanomas were established by intradermal injection of 4-hydroxy-tamoxifen (10μl of a 20 μM solution in DMSO) in Tyr::CreER+/−; BrafCA/+; Ptenlox/lox mice (12 (link)) that had been backcrossed onto a B6 background, as described (13 (link)).
For all studies, animals were maintained in pathogen-free facilities at the Geisel School of Medicine, and all procedures were approved by the Dartmouth College Institutional Animal Care and Use Committee.