FADD is a key regulator of lipid metabolism (2016)
Figure 4

Figure 4. Increased mitochondria, energy expenditure and lipolysis in adipose tissues of FADD-D mice.

A Left, transmission electron microscopic analysis of adipocytes from WAT and BAT of WT and FADD-D mice. Arrowheads indicate mitochondria and lipid droplets (L) (× 5,000 magnification). Right, quantification of mitochondria in WAT and BAT of WT and FADD-D mice, respectively. Data are expressed as mean ± SEM from three independent experiments (n = 6 total for each genotype). *P = 0.0007, **P = 0.0083 (Student’s t-test).

B Quantitative real time PCR for UCP1, Dio2, PPARd, UCP3, CPT1 and PGC1-α, using RNA from epididymal fat from 10-week-old male WT and FADD-D mice on a SD. Data are expressed as mean ± SEM from three independent experiments (n = 6 total for each genotype). *P = 0.0014, **P = 0.0025, ***P = 0.0006, ****P = 0.0007, #P = 0.0003, ##P = 0.0008 (Student’s t-test).

C Quantitative real time PCR for UCP3, CPT1, PPARd and PGC1-α, using RNA from skeletal muscle from 10-week-old male WT and FADD-D mice on a SD. Data are expressed as mean ± SEM from three independent experiments (n = 6 total for each genotype). *P = 0.0027, **P = 0.0329, ***P = 0.0092, ****P = 0.0085 (Student’s t-test).

D Quantitative real time PCR for UCP1, using RNA from BAT from 10-week-old male WT and FADD-D mice on a SD. Data are expressed as mean ± SEM from three independent experiments (n = 6 total for each genotype). *P = 0.0018 (Student’s t-test).

E Immunoblotting of UCP1 and Tubulin (control) (top) with relative quantification (bottom), using total cell lysates of BAT from 10-week-old male WT and FADD-D mice on a SD. Data are expressed as mean ± SEM from three independent experiments. *P = 0.0217 (Student’s t-test).

F Oxygen consumption in isolated BAT from 10-week-old male WT and FADD-D mice on a SD (n = 4 for each genotype). Data are expressed as mean ± SEM. *P = 0.0025, **P = 0.0006 (Student’s t-test).

G Quantitative real time PCR for PGC1α, C/EBPα and PPARγ, using RNA from BAT from 10-week-old male WT and FADD-D mice on a SD. Data are expressed as mean ± SEM from two independent experiments (n = 4 total for each genotype). *P = 0.0113 (Student’s t-test). NS, not statistically significant.

H β-oxidation analysis of white adipocytes isolated from WT (n = 5) and FADD-D mice (n = 4). 1-14C labeled oleic acid was added to the medium containing isolated adipocytes (5×105), and 14CO2 trapped by the filter paper soaked with hyamine hydroxide was measured after a 3 h-incubation by a scintillation counter. Data are expressed as mean ± SEM. *P = 0.0022 (Student’s t-test).

I Basal and stimulated (+ 100 nM isoproterenol) lipolysis, as measured by glycerol (left) and fatty acids (right) released from explants of epididymal WAT from overnight fasted 10-week-old male WT and FADD-D mice fed a HFD (n = 4 for each genotype). Data are expressed as mean ± SEM. *P = 0.0078, **P = 0.0065, ***P = 0.0008, ^P = 0.0133, ^^P = 0.0053, ^^^P = 0.0006, ^^^^P = 0.0001, #P = 0.0082, ##P = 0.0051, ###P = 0.0009, *^P = 0.0151, *^^P = 0.0019, **^^P = 0.0005, ***^P = 0.0002 (Student’s t-test).

J Molar ratio of FFA to glycerol release from WAT explants (n = 4 for each genotype). Data are expressed as mean ± SEM. *P = 0.0412, **P = 0.0033 (Student’s t-test).