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Updated: Feb 4, 2026
An Organotypic High Throughput System for Characterization of Drug Sensitivity of Primary Multiple Myeloma Cells
Published on: July 15, 2015
Hypermethylation-mediated silencing of RASD1 drives multiple myeloma pathogenesis
Chenfeng Yi1,2, Yuxi Cai1, Nana Ren1
1Department of Hematology, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, 563000, China.
Background:
The role of Ras-related dexamethasone-induced 1 (RASD1) in multiple myeloma (MM) pathogenesis remains unclear. This study investigated the expression profile, clinical significance, and epigenetic regulation of RASD1 in MM.
Methods:
Bone marrow samples were collected from 26 newly diagnosed patients with MM and 8 healthy controls. RASD1 messenger RNA (mRNA) and protein expression were analyzed using reverse transcription quantitative polymerase chain reaction (RT-qPCR) and immunohistochemistry, respectively. DNA methylation status was assessed via methylation-specific PCR (MSP). The U266 MM cell line was treated with the demethylating agent decitabine (DAC) to evaluate its effects on RASD1 expression and apoptosis.
Results:
RASD1 mRNA and protein expression were significantly downregulated in patients with MM compared to healthy controls (P < 0.001). Low RASD1 mRNA levels correlated significantly with advanced DS stage, anemia, hypercalcemia, and elevated M-protein concentrations (P < 0.05). The receiver operating characteristic curve indicated that RASD1 mRNA expression was a robust discriminator between patients with MM and healthy individuals (area under the curve = 0.882, sensitivity = 100%, specificity = 75%). MSP analysis revealed RASD1 promoter hypermethylation in patients with MM, whereas controls exhibited hypomethylation. Treatment of U266 cells with DAC restored RASD1 expression and significantly increased apoptosis compared with controls (12.08% vs. 5.04%, P < 0.01).
Conclusion:
RASD1 is frequently silenced in MM through promoter hypermethylation. This epigenetic inactivation is associated with adverse clinical features and enhanced cell survival, supporting a tumor suppressor role for RASD1 in MM pathogenesis.
Insights
Ras-related dexamethasone-induced 1 (RASD1) is downregulated in multiple myeloma (MM) due to promoter hypermethylation. Restoring RASD1 expression via demethylation promotes MM cell apoptosis, suggesting a tumor suppressor role.
Area of Science:
- Hematology
- Oncology
- Epigenetics
Background:
- The role of Ras-related dexamethasone-induced 1 (RASD1) in multiple myeloma (MM) pathogenesis is not well understood.
- Investigating RASD1's expression, clinical relevance, and epigenetic regulation in MM is crucial.
Purpose of the Study:
- To examine the expression profile of RASD1 in MM.
- To determine the clinical significance of RASD1 in MM.
- To elucidate the epigenetic mechanisms regulating RASD1 in MM.
Main Methods:
- Analyzed RASD1 mRNA and protein expression in MM patients and controls using RT-qPCR and immunohistochemistry.
- Assessed RASD1 promoter methylation status using methylation-specific PCR (MSP).
- Treated U266 MM cells with decitabine (DAC) to observe effects on RASD1 expression and apoptosis.
Main Results:
- RASD1 expression was significantly downregulated in MM patients compared to controls (P < 0.001).
- Low RASD1 mRNA levels correlated with advanced clinical features in MM.
- RASD1 promoter hypermethylation was observed in MM, and DAC treatment restored expression and increased apoptosis.
Conclusions:
- RASD1 is epigenetically silenced via promoter hypermethylation in MM.
- This silencing is linked to adverse clinical characteristics and increased cell survival.
- RASD1 functions as a tumor suppressor in multiple myeloma pathogenesis.
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