Left-hand panel illustrates these relationships in the
presence of normal energy balance and physical fitness: low levels of leptin and
LCFA uptake Vmax, high evels of Spexin. Right hand panel
reflects the situation in the presence of excessive energy, leading to obesity:
higher levels of leptin and increased LCFA uptake Vmax, low levels of spexin.
The interlocking gears illustrate the strong, negative correlation between
plasma Spexin and leptin concentrations, and their respective relationship to
the Vmax for adipocyte LCFA uptake.