Fig. 2.
Leptin receptor signalling via JAK–STAT pathways in PBMC. The leptin receptor is associated with JAKs. Upon leptin stimulation, JAK activity is increased and STAT-3 is tyrosine phosphorylated, dimerized and translocated to the nucleus to activate gene expression. STAT-3 is also associated with tyrosine phosphorylated Sam68 in response to leptin.