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MiR-622 suppresses proliferation, invasion and migration by directly targeting activating transcription factor 2 in
Rui Zhang1, Hui Luo, Shuai Wang
1Department of Neurosurgery, The First Affiliated Hospital of Nanjing Medical University, Guangzhou Road 300#, Nanjing, 210029, China.
Abstract:
Malignant gliomas are the most common and devastating primary brain tumors in adults. The rapid invasion of tumor cells into the adjacent normal brain tissues is a major cause of treatment failure, yet the mechanisms that regulate this process remain poorly understood. MicroRNAs have recently emerged as regulators of invasion and metastasis by acting on multiple signaling pathways. In this study, we found that miR-622 is significantly downregulated in glioma tissues and cell lines. Functional experiments showed that increased miR-622 expression reduced glioma cell invasion and migration, whereas decreased miR-622 expression enhanced cell invasion and migration. Moreover, activating transcription factor 2 (ATF2), an important transcription factor that regulate tumor invasion, was identified as a direct target of miR-622. Knockdown of ATF2 using small interefering RNA recapitulated the anti-invasive function of miR-622, whereas restoring the ATF2 expression attenuated the function of miR-622 in glioma cells. Furthermore, clinical data indicated that miR-622 and ATF2 were inversely expressed in glioma specimens. Our findings provide insight into the specific biological behavior of miR-622 in tumor invasion and migration. Targeting miR-622/ATF2 axis is a novel therapeutic approach for blocking glioma invasion.
Insights
MicroRNA-622 (miR-622) suppresses malignant glioma invasion by targeting activating transcription factor 2 (ATF2). Restoring miR-622 or inhibiting ATF2 may offer new therapeutic strategies for brain tumors.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Malignant gliomas are aggressive primary brain tumors with poor prognoses.
- Tumor cell invasion into surrounding brain tissue is a primary driver of treatment failure.
- MicroRNAs (miRNAs) are emerging as key regulators of cancer cell invasion and metastasis.
Purpose of the Study:
- To investigate the role of miR-622 in regulating glioma cell invasion and migration.
- To identify the molecular targets of miR-622 involved in glioma progression.
- To explore the therapeutic potential of targeting the miR-622/ATF2 axis in malignant gliomas.
Main Methods:
- Quantitative real-time PCR to assess miR-622 expression in glioma tissues and cell lines.
- In vitro cell invasion and migration assays (e.g., Transwell assays).
- Luciferase reporter assays, Western blotting, and small interfering RNA (siRNA) experiments to validate ATF2 as a direct target of miR-622.
Main Results:
- miR-622 was significantly downregulated in glioma tissues and cell lines.
- Overexpression of miR-622 inhibited glioma cell invasion and migration; conversely, reduced miR-622 enhanced these processes.
- Activating transcription factor 2 (ATF2) was identified as a direct target of miR-622, and its knockdown mimicked miR-622's anti-invasive effects.
- Clinical data revealed an inverse correlation between miR-622 and ATF2 expression in glioma specimens.
Conclusions:
- miR-622 functions as a tumor suppressor by inhibiting glioma cell invasion and migration.
- The miR-622/ATF2 signaling axis plays a critical role in regulating glioma cell motility.
- Targeting the miR-622/ATF2 pathway represents a promising novel therapeutic strategy for combating malignant glioma invasion.
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