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RACK-1 overexpression protects against goniothalamin-induced cell death
S H Inayat-Hussain1, L T Wong, K M Chan
1Toxicology and Biocompatibility Laboratory, Faculty of Allied Health Sciences, Universiti Kebangsaan Malaysia. salmaan@medic.ukm.my
Abstract:
Goniothalamin, a styryllactone, has been shown to induce cytotoxicity via apoptosis in several tumor cell lines. In this study, we have examined the potential role of several genes, which were stably transfected into T-cell lines and which regulate apoptosis in different ways, on goniothalamin-induced cell death. Overexpression of full-length receptor for activated protein C-kinase 1 (RACK-1) and pc3n3, which up-regulates endogenous RACK-1, in both Jurkat and W7.2 T cells resulted in inhibition of goniothalamin-induced cell death as assessed by MTT and clonogenic assays. However, overexpression of rFau (antisense sequence to Finkel-Biskis-Reilly murine sarcoma virus-associated ubiquitously expressed gene) in W7.2 cells did not confer resistance to goniothalamin-induced cell death. Etoposide, a clinically used cytotoxic agent, was equipotent in causing cytotoxicity in all the stable transfectants. Assessment of DNA damage by Comet assay revealed goniothalamin-induced DNA strand breaks as early as 1 h in vector control but this effect was inhibited in RACK-1 and pc3n3 stably transfected W7.2 cells. This data demonstrate that RACK-1 plays a crucial role in regulating cell death signalling pathways induced by goniothalamin.
Insights
Goniothalamin induces cancer cell death, but overexpressing the receptor for activated protein C-kinase 1 (RACK-1) inhibits this effect. RACK-1 plays a key role in goniothalamin
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Death Signaling
Background:
- Goniothalamin, a natural styryllactone, exhibits anticancer properties by inducing apoptosis.
- Understanding the molecular mechanisms of goniothalamin-induced cytotoxicity is crucial for developing targeted cancer therapies.
Purpose of the Study:
- To investigate the role of specific genes regulating apoptosis in T-cell lines in response to goniothalamin treatment.
- To determine if modulating receptor for activated protein C-kinase 1 (RACK-1) expression affects goniothalamin-induced cell death.
Main Methods:
- Stable transfection of T-cell lines (Jurkat and W7.2) with genes regulating apoptosis, including RACK-1 and rFau.
- Assessment of goniothalamin-induced cytotoxicity using MTT and clonogenic assays.
- Evaluation of DNA damage via Comet assay.
Main Results:
- Overexpression of RACK-1 or pc3n3 (which upregulates RACK-1) inhibited goniothalamin-induced cell death in T-cells.
- Overexpression of rFau did not confer resistance to goniothalamin.
- Goniothalamin induced DNA strand breaks, an effect suppressed by RACK-1 overexpression.
- Etoposide showed similar cytotoxicity across all cell lines, indicating specific effects of RACK-1 on goniothalamin response.
Conclusions:
- Receptor for activated protein C-kinase 1 (RACK-1) plays a significant role in regulating the cell death signaling pathways triggered by goniothalamin.
- Targeting RACK-1 may offer a strategy to modulate the efficacy of goniothalamin as an anticancer agent.
