GO:0033210

A series of molecular signals initiated by the binding of leptin to a receptor on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. Leptin is a hormone manufactured primarily in the adipocytes of white adipose tissue, and the level of circulating leptin is directly proportional to the total amount of fat in the body. [GOC:mah, GOC:signaling, GOC:yaf]