Figure 3.

An acute exposure to cold decreases body and skin temperature of MBH^Lpl mice but not of MBHΔ^Lp (A). Thermic images of brown adipose tissue (BAT) temperature of MBH^Lpl at 22°C (B) and at 4°C (C) shows a decrease during the acute cold exposure whereas BAT temperature of MBHΔ^Lpl at 22°C (D), is maintained at 4°C (E). The value of BAT temperature for MBH^Lpl and MBHΔ^LPL mice at 22°C and at 4°C is presented in a global histogram, showing a decrease of BAT temperature at 4°C for MBH^Lpl whereas MBHΔ^Lpl mice present no difference at 4°C (F). Measurement of mRNA expression in BAT (G) for uncoupling proteins (UCPs) show no difference between MBH^Lpl and MBHΔ^Lpl at 22 or at 4°C. mRNA expression of AdRβ3 is increased at 4°C in MBHΔ^LPL group compared to MBH^Lpl. Data are mean ± SEM (n = 6). *p < 0.05, **p < 0.01 vs. MBH^Lpl mice at 22°C, ^£p < 0.05 vs. MBH^Lpl mice at 4°C.