ERK2 Is a Promoter of Cancer Cell Growth and Migration in Colon Adenocarcinoma
Alessia Parascandolo1, Giulio Benincasa2, Francesco Corcione3
1Department of Translational Medical Sciences, University of Naples Federico II, Via Pansini 5, 80131 Naples, Italy.
Abstract:
ERK1/2 phosphorylation is frequently downregulated in the early phase of colon tumorigenesis with subsequent activation of ERK5. In the current work, we studied the advantages of ERK1/2 downregulation for tumor growth by dissecting the individual functions of ERK1 and ERK2. The patient sample data demonstrated decreased ERK1/2 phosphorylation in the early phase of tumorigenesis followed by increased phosphorylation in late-stage colon adenocarcinomas with intratumoral invasion or metastasis. In vitro results indicated that SOD3-mediated coordination of small GTPase RAS regulatory genes inhibited RAS-ERK1/2 signaling. In vitro and in vivo studies suggested that ERK2 has a more prominent role in chemotactic invasion, collective migration, and cell proliferation than ERK1. Of note, simultaneous ERK1 and ERK2 expression inhibited collective cell migration and proliferation but tended to promote invasion, suggesting that ERK1 controls ERK2 function. According to the present data, phosphorylated ERK1/2 at the early phase of colon adenocarcinoma limits tumor mass expansion, whereas reactivation of the kinases at the later phase of colon carcinogenesis is associated with the initiation of metastasis. Additionally, our results suggest that ERK1 is a regulatory kinase that coordinates ERK2-promoted chemotactic invasion, collective migration, and cell proliferation. Our findings indicate that ROS, especially H2O2, are associated with the regulation of ERK1/2 phosphorylation in colon cancer by either increasing or decreasing kinase activity. These data suggest that ERK2 has a growth-promoting role and ERK1 has a regulatory role in colon tumorigenesis, which could lead to new avenues in the development of cancer therapy.
Insights
ERK1/2 phosphorylation is downregulated early in colon cancer, promoting growth. ERK2 drives invasion and proliferation, while ERK1 regulates its function, offering new therapeutic targets for colon tumorigenesis.
Area of Science:
- Cellular Biology
- Oncology
- Molecular Signaling
Background:
- Extracellular signal-regulated kinases (ERK1/2) play critical roles in cell signaling.
- Dysregulation of ERK1/2 signaling is implicated in various cancers, including colon adenocarcinoma.
- Understanding the distinct roles of ERK1 and ERK2 is crucial for targeted cancer therapies.
Purpose of the Study:
- To investigate the differential functions of ERK1 and ERK2 in colon tumorigenesis.
- To elucidate the mechanisms underlying ERK1/2 phosphorylation changes during colon cancer progression.
- To explore the potential of targeting ERK signaling pathways for colon cancer treatment.
Main Methods:
- Analysis of patient colon adenocarcinoma samples.
- In vitro studies using cell culture models.
- In vivo experiments to assess tumor growth and metastasis.
- Investigation of reactive oxygen species (ROS) involvement in ERK1/2 regulation.
Main Results:
- Decreased ERK1/2 phosphorylation observed in early-stage colon tumorigenesis, with increased phosphorylation in late-stage metastatic disease.
- ERK2 demonstrated a more significant role in promoting chemotactic invasion, collective migration, and cell proliferation compared to ERK1.
- Simultaneous ERK1 and ERK2 expression inhibited migration and proliferation but enhanced invasion, suggesting ERK1's regulatory role over ERK2.
- Reactive oxygen species, particularly hydrogen peroxide (H2O2), were found to modulate ERK1/2 phosphorylation.
Conclusions:
- ERK1/2 phosphorylation dynamics are critical in colon cancer progression, limiting early tumor expansion but facilitating later-stage metastasis.
- ERK2 acts as a growth promoter, while ERK1 functions as a regulatory kinase coordinating ERK2's pro-tumorigenic activities.
- Targeting ERK signaling, considering the distinct roles of ERK1 and ERK2, presents a promising strategy for novel colon cancer therapies.
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