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Published on: January 7, 2019
Dvl proteins regulate SMAD1, AHR, mTOR, BRD7 protein expression while differentially regulating canonical and
Ceyda Caliskan1, Zeynep Yuce2, Hakki Ogun Sercan2
1Department of Medical Biology and Genetics, Faculty of Medicine, Dokuz Eylul University, Balcova, Izmir, Turkey; School of Biosciences, University of Sheffield, Sheffield S10 2TN, United Kingdom.
Abstract:
Dishevelled (Dvl) is a scaffold protein that transmits Wnt signals to downstream effector molecules via both canonical and non-canonical Wnt signaling pathways. Deregulated activation of Dvl proteins has been reported in various solid tumors. However, it is not clear which pathway and proteins are responsible for observed aberrant activities and their relevance in disease prognosis. In addition, there is relatively limited knowledge on the role Dvl proteins may have in hematologic malignancy etiopathogenesis. In this study, we demonstrated that Dvl genes are not expressed in normal bone marrow but are expressed at different levels in the bone marrow of patients with chronic myeloid leukemia. We showed SMAD1, AHR, mTOR, BRD7 protein expressions are significantly affected by Dvl silencing and overexpression in CML cell lines. Wnt/β-catenin and Wnt/PCP signaling pathway components are effectively repressed after Dvl silencing in K562 cells, while regulator of Wnt/Ca2+ signaling showed increase in both CML cell lines. Targeting Dvl proteins increases imatinib susceptibility of the K562 and MEG-01 cell lines. In light of our data, Dvl could be a potential therapeutic target in the treatment of CML.
Insights
Dishevelled (Dvl) proteins are expressed in chronic myeloid leukemia (CML) but not normal bone marrow. Targeting Dvl enhances imatinib effectiveness, suggesting Dvl as a potential CML therapeutic target.
Area of Science:
- Molecular oncology
- Hematologic malignancies
- Signal transduction
Background:
- Dishevelled (Dvl) proteins are crucial scaffold proteins in Wnt signaling pathways.
- Dvl deregulation is implicated in solid tumors, but its role in hematologic malignancies is understudied.
- Understanding Dvl's role in leukemia pathogenesis is critical for developing novel therapies.
Purpose of the Study:
- To investigate the expression and role of Dvl proteins in chronic myeloid leukemia (CML).
- To identify downstream signaling pathways affected by Dvl modulation in CML.
- To evaluate the therapeutic potential of targeting Dvl in CML.
Main Methods:
- Quantitative analysis of Dvl gene expression in normal and CML bone marrow.
- Dvl silencing and overexpression experiments in CML cell lines (K562, MEG-01).
- Assessment of downstream signaling pathway components (SMAD1, AHR, mTOR, BRD7, Wnt/β-catenin, Wnt/PCP, Wnt/Ca2+).
- Evaluation of imatinib susceptibility following Dvl targeting.
Main Results:
- Dvl genes are expressed in CML bone marrow but absent in normal bone marrow.
- Dvl modulation significantly impacts SMAD1, AHR, mTOR, and BRD7 protein levels in CML cells.
- Dvl silencing represses Wnt/β-catenin and Wnt/PCP pathways while activating Wnt/Ca2+ signaling.
- Targeting Dvl enhances the sensitivity of CML cells to imatinib.
Conclusions:
- Dvl proteins play a significant role in the pathogenesis of CML.
- Dvl is a potential therapeutic target for CML treatment.
- Combined targeting of Dvl and imatinib may offer a novel therapeutic strategy for CML.
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