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Perillyl alcohol as a radio-/chemosensitizer in malignant glioma
Deepika Rajesh1, Rachelle A Stenzel, Steven P Howard
1Department of Human Oncology, University of Wisconsin Comprehensive Cancer Center, Madison, Wisconsin 53792, USA.
Abstract:
The prognosis for patients with malignant glioma has not significantly changed in two decades, despite advances in surgery, radiation, and chemotherapy, emphasizing the growing need for novel approaches to glioma therapy. Perillyl alcohol (POH) is a naturally occurring monoterpene that has been shown to possess chemotherapeutic as well as chemopreventive activity in animal tumor models and is currently in Phase I and Phase II clinical trials. In the present study, we have demonstrated that POH is an effective radiosensitizer at clinically relevant doses of radiation using established glioma cell lines. POH caused a transient arrest in the G2/M phase of the cell cycle and induced apoptosis in glioma cells. POH treatment sensitized glioma cells to Fas-mediated apoptosis, which was further augmented in the presence of ionizing radiation and abrogated in the presence of antagonistic antibody. POH-induced radiosensitization was partially inhibited in glioma cells expressing dominant negative Fas-associated death domain and completely inhibited in glioma cells overexpressing the cytokine response modifier A. In addition, POH treatment resulted in a dose-dependent sensitization to cisplatin and doxorubicin induced cytotoxicity in glioma cells, highlighting its usefulness as a potent radio/chemosensitizer in the treatment of malignant glioma.
Insights
Perillyl alcohol (POH) enhances radiation therapy for malignant glioma by increasing cancer cell death. This natural compound also sensitizes glioma cells to chemotherapy, offering a promising new approach for brain tumor treatment.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Malignant glioma prognosis remains poor despite advances in conventional therapies.
- Novel therapeutic strategies are urgently needed for effective glioma treatment.
- Perillyl alcohol (POH), a natural monoterpene, shows promise in preclinical and clinical studies.
Purpose of the Study:
- To evaluate Perillyl alcohol (POH) as a radiosensitizer in malignant glioma.
- To investigate the mechanisms underlying POH-induced radiosensitization.
- To assess POH's efficacy as a chemosensitizer in combination with standard chemotherapeutic agents.
Main Methods:
- Glioma cell lines were treated with POH and clinically relevant doses of radiation.
- Cell cycle progression and apoptosis induction were analyzed.
- Fas-mediated apoptosis and the role of specific signaling molecules (FADD, CRMA) were investigated.
- Sensitization to cisplatin and doxorubicin was evaluated.
Main Results:
- POH effectively sensitized glioma cells to radiation therapy.
- POH induced G2/M cell cycle arrest and apoptosis in glioma cells.
- POH enhanced Fas-mediated apoptosis, particularly when combined with ionizing radiation.
- POH demonstrated dose-dependent sensitization to cisplatin and doxorubicin, improving cytotoxic effects.
Conclusions:
- Perillyl alcohol (POH) acts as a potent radiosensitizer and chemosensitizer for malignant glioma.
- POH's mechanism involves cell cycle arrest, apoptosis induction, and modulation of Fas-mediated pathways.
- POH represents a promising therapeutic agent for enhancing conventional treatments in glioma therapy.
