(A) Serum TG and cholesterol were measured in H-WT, H-Vmp1 KO and H-Vmp1 KO/KI mice at 2 weeks post AAV. (B) Mice were fasted for 4 hours followed by Pluronic™ F-127 injection for another 4 hours. Pooled serum samples were subjected to FPLC analysis of lipoproteins (n = 5), and each corresponding fraction was subjected to immunoblot analysis for APOB. (C) VLDL secretion was assessed in mice after VMP1 restoration. (D) Representative images of gross livers, H&E and Oil Red O staining of mouse livers. (E-H) Hepatic TG (E), body weight (F), liver/body weight ratio (G) and ALT (H) were quantified. Data represent mean ± SEM (n = 5–7). *p <0.05; ***p <0.001 (Unpaired Student’s t test for 2 group comparison or one-way ANOVA with Holm-Sidak post hoc test for multigroup comparison).