Adipocyte-specific ATGL KO mice have enhanced FABP4 secretion in vivo. Quantification of (A) plasma FABP4, (B) blood glucose, (C) body weight, and (D) plasma insulin in ATGLfl/fl (black bars) and ATGLAdpKO (red bars) mice under ad libitum-fed conditions, following 24 h food withdrawal, and 3.5 h after food was added back to cages (N = 15–17/group; two-way ANOVA). E: Plasma FABP4 in ATGLfl/fl and ATGLAdpKO following induction of lipolysis with ISO (10 mg/kg) (N = 15–16/group; two-way ANOVA). F: Plasma FABP4 levels in ATGLfl/fl and ATGLAdpKO mice injected with 10 μg recombinant FABP4 (N = 3–5/group; two-way ANOVA). G: Plasma insulin in ATGLfl/fl and ATGLAdpKO following induction of lipolysis with ISO (10 mg/kg) (N = 15–16/group; two-way ANOVA). All mouse experiments performed in 8- to 10-week-old male mice. Data are presented as mean ± SEM.