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Updated: Dec 11, 2025
A Protocol for Rapid Post-mortem Cell Culture of Diffuse Intrinsic Pontine Glioma DIPG
Published on: March 7, 2017
Diffuse Intrinsic Pontine Glioma Cells Are Vulnerable to Mitotic Abnormalities Associated with BMI-1 Modulation
Shiva Senthil Kumar1, Satarupa Sengupta1, Xiaoting Zhu2,3
1Brain Tumor Center, Division of Oncology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio.
Insights
Targeting BMI-1 in diffuse intrinsic pontine glioma (DIPG) causes DNA damage and cell death. Combining BMI-1 modulation with radiation therapy shows promise for treating this pediatric brain tumor.
Area of Science:
- Pediatric oncology
- Cancer molecular biology
- Radiation oncology
Background:
- Diffuse intrinsic pontine glioma (DIPG) is an aggressive pediatric brain tumor with a median survival under 1 year.
- Current therapeutic options for DIPG are limited, with no significant advances in decades.
- BMI-1 has been identified as a potential therapeutic target due to its high expression in DIPG tumors.
Purpose of the Study:
- To investigate the effects of BMI-1 modulation on DIPG cells and tumor growth.
- To evaluate the efficacy of combining BMI-1 modulation with ionizing radiation (IR) for DIPG treatment.
- To explore the correlation between BMI-1 expression, stemness, and therapeutic response in DIPG.
Main Methods:
- Modulation of BMI-1 in DIPG patient-derived stem-like cells and assessment of cellular effects (DNA damage, cell cycle arrest, cell death).
- Evaluation of the combination of a BMI-1 modulator (PTC596) and IR on DIPG cell viability and DNA damage response (DDR) kinetics.
- In vivo studies using mice bearing DIPG xenografts treated with PTC596 and IR, assessing tumor growth, apoptosis, and survival.
Main Results:
- BMI-1 modulation induced DNA damage, M phase cell-cycle arrest, chromosome scattering, and cell death in DIPG cells.
- Combining PTC596 and IR impaired DDR kinetics, reduced cell viability more than single treatments, and decreased tumor volume and growth in vivo.
- BMI-1 expression positively correlated with DIPG stemness and was upregulated in undifferentiated cells, suggesting a role in tumor stemness.
Conclusions:
- BMI-1 modulation leads to mitotic abnormalities, impaired DNA damage response, and cell death in DIPG.
- The combination of BMI-1 modulation and ionizing radiation represents a promising novel therapeutic strategy for DIPG.
- Targeting BMI-1 may be effective in overcoming therapeutic resistance associated with DIPG stemness.
Abstract:
Diffuse intrinsic pontine glioma (DIPG) is a poor-prognosis pediatric brain tumor with a median survival of less than 1 year. No effective therapy is currently available, and no therapeutic advances have been made in several decades. We have previously identified BMI-1 as a potential therapeutic target in DIPG and have shown that BMI-1 is highly expressed in DIPG tumors regardless of histone 3 subtype. In the present study, we show that the modulation of BMI-1 leads to DNA damage, M phase cell-cycle arrest, chromosome scattering, and cell death. Interestingly, EZH2 inhibition did not alter these effects. Furthermore, modulation of BMI-1 sensitizes DIPG patient-derived stem-like cells to ionizing radiation (IR). Treatment of DIPG stem-like cells with PTC596, a BMI-1 modulator, and IR impairs the kinetics of DNA damage response (DDR). Both DDR foci formation and resolution were delayed, resulting in further reduction in cell viability compared with either treatment alone. In vivo, treatment of mice bearing DIPG xenografts with PTC596 leads to decreased tumor volume and growth kinetics, increased intratumoral apoptosis, and sustained animal survival benefit. Gene expression analysis indicates that BMI-1 expression correlates positively with DIPG stemness and BMI-1 signature. At the single-cell level, the analysis reveals that BMI-1 pathway is upregulated in undifferentiated cells and positively correlates with stemness in DIPG tumors. IMPLICATIONS: Together, our findings indicate that BMI-1 modulation is associated with mitotic abnormalities, impaired DDR, and cell death, supporting the combination of BMI-1 modulation and radiation as a promising novel therapy for children with DIPG.
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