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CMIP Promotes Proliferation and Metastasis in Human Glioma
Bin Wang1,2, Zheng-Sheng Wu3, Qiang Wu1,3
1Department of Oncology, The Second Affiliated Hospital of Anhui Medical University, Hefei, China.
Abstract:
Glioma is one of the most common primary malignant brain tumors and the outcomes are generally poor. The intrinsic mechanisms involved in glioma development and progression remain unclear. Further studies are urgent and necessary. In this study, we have proven that CMIP (C-Maf-inducing protein) promotes cell proliferation and metastasis in A172 cells through knockdown of CMIP and in U251 cells through overexpression of CMIP by using MTT assay, cell colony formation assay, cell migration assay, and cell invasion assay. Furthermore, we discovered that CMIP upregulates MDM2, which is involved in the promoting role of CMIP in human glioma cells. For clinical study, 99 glioma tissues and 59 normal tissues were analyzed. CMIP expression was higher in glioma tissues than in normal tissues. In glioma tissues, CMIP is found to correlate positively with tumor grade but no significant correlation is found with patients' age, gender, or Karnofsky performance score (KPS). Moreover, CMIP also correlates with low relapse-free survival (RFS) rate and overall survival (OS) rate in glioma patients. Therefore, CMIP is oncogenic and could be a potential target for human glioma diagnosis and therapy.
Insights
C-Maf-inducing protein (CMIP) drives glioma growth and spread by increasing MDM2. Higher CMIP levels in glioma tissues correlate with advanced tumor grade and poorer patient survival, suggesting CMIP as a therapeutic target.
Area of Science:
- Neuro-oncology
- Molecular Biology
- Cancer Research
Background:
- Gliomas are aggressive primary brain tumors with poor prognoses.
- The molecular mechanisms driving glioma development and progression are not fully understood.
- Identifying novel therapeutic targets is crucial for improving patient outcomes.
Purpose of the Study:
- To investigate the role of C-Maf-inducing protein (CMIP) in human glioma.
- To determine the functional impact of CMIP on glioma cell proliferation, migration, and invasion.
- To explore the correlation between CMIP expression and clinical parameters in glioma patients.
Main Methods:
- Cell proliferation, colony formation, migration, and invasion assays were performed.
- CMIP was manipulated via knockdown in A172 cells and overexpression in U251 cells.
- MDM2 expression was analyzed in relation to CMIP.
- CMIP expression levels were quantified in 99 glioma and 59 normal tissues using immunohistochemistry.
- Statistical analyses correlated CMIP expression with tumor grade, patient demographics, and survival rates (RFS and OS).
Main Results:
- CMIP overexpression promoted glioma cell proliferation, migration, and invasion.
- CMIP knockdown inhibited these processes.
- CMIP was found to upregulate MDM2 expression in glioma cells.
- CMIP expression was significantly higher in glioma tissues compared to normal tissues.
- Elevated CMIP levels correlated positively with higher tumor grade and reduced relapse-free and overall survival rates.
Conclusions:
- CMIP acts as an oncogene in human glioma, promoting tumor progression.
- CMIP's oncogenic function is partly mediated through MDM2 upregulation.
- CMIP represents a potential diagnostic biomarker and therapeutic target for human glioma.
