Effects of pinealectomy on the circadian release pattern of leptin in male rat. Baydas G, Gursu F, Canpolat S, Konar V, Yasar A, Canatan H, Kelestimur H. Journal Article 2001; 22(6): 449-452 PubMed PMID: 11781543 Keywords: Animals, Body Weight, Circadian Rhythm:physiology, Leptin:blood, Male, Melatonin:metabolism, Pineal Gland:metabolism, Rats, Rats, Wistar,. Citation OBJECTIVES: Exogenous and endogenous melatonin decrease leptin release. It is not known whether melatonin also has an effect on circadian ..... Read abstract