Nobiletin enhances differentiation and lipolysis of 3T3-L1 adipocytes

Nobiletin is a polymethoxylated flavone found in certain citrus fruits. Here we demonstrate that nobiletin enhance differentiation of 3T3-L1 preadipocytes. Nobiletin dose-dependently increased accumulation of lipid droplets in adipocytes. Quantitative. RT-PCR analyses indicated that nobiletin increased the expression of genes critical for acquisition of the adipocyte phenotype. Some of them were known peroxisome proliferator activated receptor gamma (PPAR gamma) targets and PPAR gamma itself, however, nobiletin did not exhibit PPAR gamma ligand activity. We observed the expression of CCAAT/enhancer binding protein beta(C/EBP beta), a transcription factor for PPAR gamma, was increased by nobiletin. The activation of cAMP-responsive element binding protein (CREB) and extracellular signal-regulated kinase (ERK), which play important roles in C/EBP beta expression were also potentiated by nobiletin. Furthermore, nobiletin stimulated lipolysis in differentiated adipocytes, which is known to be stimulated by cAMP pathway. These results suggested that nobiletin enhanced both differentiation and lipolysis of adipocyte through activation of signaling cascades mediated by cAMP/CREB. (c) 2007 Elsevier Inc. All rights reserved.