Gedunin modulates cellular growth and apoptosis in glioblastoma cell lines
Michael Stouffer1, Elizabeth Wandling1, Lindsay Dickson1
1Department of Pharmaceutical Sciences, Cedarville University School of Pharmacy, Cedarville University, Cedarville, Ohio, USA.
Background:
Glioblastomas are characterized by aggressive behavior. Surgery, radiotherapy, and alkylating agents, including temozolomide are the most common treatment options for glioblastoma. Often, conventional therapies fail to treat these tumors since they develop drug resistance. There is a need for newer agents to combat this deadly tumor. Natural products such as gedunin have shown efficacy in several human diseases. A comprehensive study of gedunin, an heat shock protein (HSP)90 inhibitor, has not been thoroughly investigated in glioblastoma cell lines with different genetic modifications.
Aims:
A key objective of this study was to determine how gedunin affects the biological and signaling mechanisms in glioblastoma cells, and to determine how those mechanisms affect the proliferation and apoptosis of glioblastoma cells.
Methods:
The viability potentials of gedunin were tested using MTT, cell counts, and wound healing assays. Gedunin's effects on glioma cells were further validated using LDH and colony formation assays. In addition, we investigated the survival and apoptotic molecular signaling targets perturbed by gedunin using Western blot analysis and flow cytometry.
Results:
Our results show that there was a reduction in cell viability and inhibition of wound healing in the cells tested. Western blot analysis of the gene expression data revealed genes such as EGFR and mTOR/Akt/NF kappa B to be associated with gedunin sensitivity. Gedunin treatment induced apoptosis by cleaving poly ADP-ribose polymerase, activating caspases, and downregulating BCL-xL. Based on these results, gedunin suppressed cell growth and HSP client proteins, resulting in apoptosis in glioblastoma cell lines.
Conclusion:
Our data provide in vitro support for the anticancer activity of gedunin in glioma cells by downregulating cancer survival proteins.
Insights
Gedunin, a natural product, effectively suppressed glioblastoma cell growth and induced apoptosis by inhibiting heat shock protein 90 (HSP90) and cancer survival proteins.
Area of Science:
- Oncology
- Molecular Biology
- Natural Products Chemistry
Background:
- Glioblastomas are aggressive brain tumors with limited treatment options due to drug resistance.
- Conventional therapies like surgery, radiotherapy, and temozolomide often fail.
- Gedunin, a natural product and heat shock protein 90 (HSP90) inhibitor, shows potential against various diseases.
Purpose of the Study:
- To investigate the effects of gedunin on glioblastoma cell biological and signaling mechanisms.
- To determine how gedunin influences glioblastoma cell proliferation and apoptosis.
- To explore gedunin's potential as a novel therapeutic agent for glioblastoma.
Main Methods:
- Cell viability assessed via MTT, cell counts, and wound healing assays.
- Gedunin's impact on glioma cells confirmed with LDH and colony formation assays.
- Apoptotic and survival signaling pathways analyzed using Western blot and flow cytometry.
Main Results:
- Gedunin significantly reduced glioblastoma cell viability and inhibited wound healing.
- Treatment induced apoptosis through poly ADP-ribose polymerase cleavage, caspase activation, and BCL-xL downregulation.
- Gedunin suppressed cancer cell growth and HSP client proteins, including EGFR and mTOR/Akt/NF-κB pathways.
Conclusions:
- Gedunin exhibits in vitro anticancer activity against glioblastoma cells.
- The compound effectively downregulates key cancer survival proteins.
- Gedunin demonstrates potential as a therapeutic agent for glioblastoma treatment.
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