(A to D) B16 tumor cells were intrasplenically injected into mice pretreated with ABX or H2O. One day before tumor injection, mice were given intraperitoneal injection of a combination of antibodies to CD4 (anti-CD4) (500 μg per mouse) and anti-CD8 (200 mg per mouse) or anti-CD8 alone (200 μg per mouse). Liver surface metastatic nodules were counted. Representative images are shown. Data represent mean ± SEM of two pooled experiments. n = 16 for H2O, 14 for ABX, 13 for anti-CD4 + anti-CD8, 5 for anti-CD8. P < 0.05, one-way ANOVA. (E and F) Loss of hepatic NKT abrogated the inhibition of liver metastasis caused by ABX. CXCR6−/−, CD1d−/−, or wild-type mice pretreated with ABX or H2O were given EL4 tumor cell tail vein injections. Liver surface metastatic nodules were counted. Data represent mean ± SEM of two pooled experiments. n = 10 for Wt-H2O, 7 for Wt-ABX, 4 for CXCR6−/−-H2O, 5 for CXCR6−/−-ABX, 5 for CD1d−/−-H2O, 4 for CD1d−/−-ABX. P < 0.05, two-way ANOVA.