ERK1/2 are essential proteins mediating mitogen-activated protein kinase signaling downstream of RAS in pancreatic adenocarcinoma(PDAC).Our previous study reveals that ARF6 plays a positive regulatory role in ERK1/2 pathway in a feedback loop manner.A significant part of the literature on ARF6 has emphasized its oncogenic effect as an essential downstream molecule of ERK1/2,and no research has been done on the regulation mechanisms of the feedback loop between ARF6 and the ERK1/2 signaling pathway.In the present study,we explore the gene network downstream of ARF6 and find that DUSP6 may be the critical signal molecule in the positive feedback loop between ARF6 and ERK1/2.Specifically,to elucidate the negative correlations between ARF6 and DUSP6 in pancreatic cancer,we examine their expressions in pancreatic cancer tissues by immunohistochemical staining.Then the impact of DUSP6 on the pro-liferation and apoptosis of PDAC cells are investigated by gain-of-function and loss-of-function approaches.Me-chanism explorations uncover that ARF6 suppresses the expression of DUSP6,which is responsible for the dephosphorylation of ERK1/2.Altogether,these results indicate that DUSP6 plays a tumor-suppressive role and acts as an intermediate molecule between ARF6 and ERK1/2 in PDAC cells,thereby forming a positive feedback loop.

Bingkai Xiao;Yue Zhang;Zekun Lu;Weibo Chen;Yong An;Guangchen Zu;Xiaowu Xu;Di Wu;Hao Yang;Yi Qin;Xuemin Chen

Department of Hepatopancreatobiliary Surgery,the Third Affiliated Hospital of Soochow University,Changzhou 213000,China;Department of Pancreatic Surgery,Fudan University Shanghai Cancer Center,Shanghai 200032,China

生物化学与生物物理学报（英文版）

[1]Bingkai Xiao;Yue Zhang;Zekun Lu;Weibo Chen;Yong An;Guangchen Zu;Xiaowu Xu;Di Wu;Hao Yang;Yi Qin;Xuemin Chen-.A positive feedback loop of ARF6 activates ERK1/2 signaling pathway via DUSP6 silencing to promote pancreatic cancer progression)[J].生物化学与生物物理学报（英文版）,2022(10):1431-1440

DUSP6,chanism

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