A positive feedback loop of ARF6 activates ERK1/2 signaling pathway via DUSP6 silencing to promote pancreatic cancer progression

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 ha...

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Published in:Acta biochimica et biophysica Sinica 2022-10, Vol.54 (10), p.1431-1440
Main Authors: Xiao, Bingkai, Zhang, Yue, Lu, Zekun, Chen, Weibo, An, Yong, Zu, Guangchen, Xu, Xiaowu, Wu, Di, Yang, Hao, Qin, Yi, Chen, Xuemin
Format: Article
Language:English
Subjects:
Adenocarcinoma
ARF6
Dual Specificity Phosphatase 6 - genetics
Dual Specificity Phosphatase 6 - metabolism
DUSP6
ERK1/2 pathway
Feedback
Humans
MAP Kinase Signaling System
Mitogen-Activated Protein Kinase 1 - metabolism
pancreatic adenocarcinoma
Pancreatic Neoplasms
Pancreatic Neoplasms - genetics
Signal Transduction
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Summary: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 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 proliferation and apoptosis of PDAC cells are investigated by gain-of-function and loss-of-function approaches. Mechanism 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.
ISSN:1672-9145
1745-7270
DOI:10.3724/abbs.2022111