Absence of Lipolytic Activity from Purified Human Growth Hormone in Cultured 3T3-L1 Adipocytes

Abstract
Although standard preparations of growth hormone (GH) activated hormone-sensitive lipase in differentiated [mouse fibroblast] 3T3-L1 adipocytes, more highly purified preparations of human and bovine hormones were not lipolytic in this system. The standard preparations were contaminated with a lipolytic substance which was removed during purification of the GH. The purified GH likewise did not stimulate lipolysis in adipose tissue from fasted rats. Dexamethasone had no potentiating activity in either assay.