Chicoric Acid Induces Apoptosis in 3T3-L1 Preadipocytes through ROS-Mediated PI3K/Akt and MAPK Signaling Pathways

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• 作者：Haifang Xiao ; Jing Wang ; Li Yuan ; Chunxia Xiao ; Yutang Wang ; Xuebo Liu
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2013
• 出版时间：February 20, 2013
• 年：2013
• 卷：61
• 期：7
• 页码：1509-1520
• 全文大小：860K
• 年卷期：v.61,no.7(February 20, 2013)
• ISSN：1520-5118

文摘

Chicoric acid has been reported to possess various bioactivities. However, the antiobesity effects of chicoric acid remain poorly understood. In this study, we investigated the effects of chicoric acid on 3T3-L1 preadipocytes and its molecular mechanisms of apoptosis. Chicoric acid inhibited cell viability and induced apoptosis in 3T3-L1 preadipocytes which was characterized by chromatin condensation and poly ADP-ribose-polymerase (PARP) cleavage. Mitochondrial membrane potential (MMP) loss, Bax/Bcl-2 dysregulation, cytochrome c release, and caspase-3 activation were observed, indicating mitochondria-dependent apoptosis induced by chicoric acid. Furthermore, PI3K/Akt and MAPK (p38 MAPK, JNK, and ERK1/2) signaling pathways were involved in chicoric acid-induced apoptosis. The employment of protein kinase inhibitors LY294002, SB203580, SP600125, and U0126 revealed that PI3K/Akt signaling pathway interplayed with MAPK signaling pathways. Moreover, chicoric acid induced reactive oxygen species (ROS) generation. Pretreatment with the antioxidant N-acetylcysteine (NAC) significantly blocked cell death and changes of Akt and MAPK signalings induced by chicoric acid. In addition, chicoric acid down regulated HO-1 and COX-2 via the PI3K/Akt pathway.

Keywords:

chicoric acid; 3T3-L1 preadipocytes; apoptosis; PI3K/Akt; MAPK; reactive oxygen species