Liver tumors were induced by chemical carcinogenesis in male mice according to the scheme shown in
Supplementary Fig. 1a. Mice were sacrificed when liver tumors were visible in
EGFRf/f,
EGFRf/+ or
EGFR+/+ Cre+ littermate control mice, which occurred around 36 weeks in the
Alfp-Cre, around 46 weeks in the
Mx-Cre and around 63 weeks in the
Alfp-Cre; LysMCre double transgenic background. The genetic background of the mice was mixed (C57BL/6 × 129/Sv × CBA/J), but varied between the different Cre lines thus explaining the difference in the timing of tumor development. For each experiment, we show
EGFRf/f littermates as controls. To exclude Cre-mediated effects we confirmed that
EGFRf/+ or EGFR
+/+Alfp-Cre, Mx-Cre, LysM-Cre mice developed the same defects as
EGFRf/f controls. Liver injury after DEN injection (100mg/kg body weight) was determined by measuring the circulating transaminases AST/ALT (
Reflotron, Roche) and by quantifying necrotic areas using H&E stained sections at the time points indicated.
Lanaya H., Natarajan A., Komposch K., Li L., Amberg N., Chen L., Wculek S.K., Hammer M., Zenz R., Peck-Radosavljevic M., Sieghart W., Trauner M., Wang H, & Sibilia M. (2014). EGFR has a tumor-promoting role in liver macrophages during hepatocellular carcinoma formation. Nature cell biology, 16(10), 972-7.