Purpurogallin is a novel mitogen-activated protein kinase kinase 1/2 inhibitor that suppresses esophageal squamous cell carcinoma growth in vitro and in vivo.

Abstract

Purpurogallin is a natural compound that is extracted from nutgalls and oak bark and it possesses antioxidant, anticancer, and anti-inflammatory properties. However, the anticancer capacity of purpurogallin and its molecular target have not been investigated in esophageal squamous cell carcinoma (ESCC). Herein, we report that purpurogallin suppresses ESCC cell growth by directly targeting the mitogen-activated protein kinase kinase 1/2 (MEK1/2) signaling pathway. We found that purpurogallin inhibits anchorage-dependent and -independent ESCC growth. The results of in vitro kinase assays and cell-based assays indicated that purpurogallin also strongly attenuates the extracellular signal-regulated kinase 1/2 (ERK1/2) signaling pathway and also directly binds to and inhibits MEK1 and MEK2 activity. Furthermore, purpurogallin contributed to S and G2 phase cell cycle arrest by reducing cyclin A2 and cyclin B1 expression and also induced apoptosis by activating poly (ADP ribose) polymerase (PARP). Notably, purpurogallin suppressed patient-derived ESCC tumor growth in an in vivo mouse model. These findings indicated that purpurogallin is a novel MEK1/2 inhibitor that could be useful for treating ESCC.

• Authors: Xiaomeng Xie, Xueyin Zu, Feifei Liu, Ting Wang, Xiangyu Wang, Hanyong Chen, Kangdong Liu, Penglei Wang, Fangfang Liu, Yan Zheng, Ann M Bode, Zigang Dong, Dong Joon Kim
• Journal: Molecular carcinogenesis (Mol Carcinog) Vol. 58 Issue 7 Pg. 1248-1259 (07 2019) ISSN: 1098-2744 [Electronic] United States
• PMID: 31100197 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2019 Wiley Periodicals, Inc.

Chemical References

• Antineoplastic Agents
• Benzocycloheptenes
• CCNA2 protein, human
• CCNB1 protein, human
• Cyclin A2
• Cyclin B1
• Plant Preparations
• Protein Kinase Inhibitors
• Poly(ADP-ribose) Polymerases
• MAP2K2 protein, human
• MAP Kinase Kinase 1
• MAP Kinase Kinase 2
• MAP2K1 protein, human
• purpurogallin

Topics

• Animals
• Antineoplastic Agents (pharmacology)
• Apoptosis (drug effects)
• Benzocycloheptenes (pharmacology)
• Cell Line, Tumor
• Cyclin A2 (biosynthesis)
• Cyclin B1 (biosynthesis)
• Esophageal Neoplasms (drug therapy, pathology)
• Esophageal Squamous Cell Carcinoma (drug therapy, pathology)
• Female
• G2 Phase Cell Cycle Checkpoints (drug effects)
• Humans
• MAP Kinase Kinase 1 (antagonists & inhibitors)
• MAP Kinase Kinase 2 (antagonists & inhibitors)
• Mice
• Plant Preparations (pharmacology)
• Poly(ADP-ribose) Polymerases (metabolism)
• Protein Kinase Inhibitors (pharmacology)
• S Phase Cell Cycle Checkpoints (drug effects)
• Signal Transduction (drug effects)
• Xenograft Model Antitumor Assays