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The antitumor effect of PLK1 and HSF1 double knockdown on human oral carcinoma cells
Soo-A Kim1, Seong-Min Kwon, Jung-Hoon Yoon
1Department of Biochemistry, Dongguk University College of Oriental Medicine, Gyeongju 780-714, Korea.
Abstract:
High levels of mitotic progression-associated PLK1 and stress-associated HSF1 have been observed in various human cancers. In the present study, we investigated the effects of PLK1 and HSF1 knockdown on the proliferation of oral cancer cells using small interfering RNA. In human oral squamous cell carcinoma (SCC) tissues, the levels of PLK1 and HSF1 were higher compared to normal tissues. The expression levels of PLK1 and HSF1 were also elevated in the human oral SCC cell lines FaDu and HEp-2. Disruption of PLK1 induced cell cycle arrest at G2/M phase as well as apoptosis in oral cancer cells. Interestingly, knockdown of both PLK1 and HSF1 expression decreased cell proliferation while increasing apoptotic cell death in synergistic fashion. These results establish the potential value of PLK1 and HSF1 as targets for oral cancer therapy.
Insights
Targeting Polo-like kinase 1 (PLK1) and heat shock factor 1 (HSF1) can reduce oral cancer cell proliferation. Combined knockdown of PLK1 and HSF1 synergistically increases cancer cell death, offering a promising therapeutic strategy.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Elevated levels of Polo-like kinase 1 (PLK1) and heat shock factor 1 (HSF1) are implicated in various human cancers.
- Increased expression of PLK1 and HSF1 is observed in oral squamous cell carcinoma (SCC) tissues and cell lines compared to normal counterparts.
Purpose of the Study:
- To investigate the impact of PLK1 and HSF1 knockdown on oral cancer cell proliferation and apoptosis.
- To evaluate the potential of PLK1 and HSF1 as therapeutic targets for oral cancer.
Main Methods:
- Utilized small interfering RNA (siRNA) to perform knockdown of PLK1 and HSF1 in human oral SCC cell lines (FaDu and HEp-2).
- Assessed cell cycle progression, apoptosis, and overall cell proliferation following gene silencing.
Main Results:
- PLK1 disruption led to G2/M phase cell cycle arrest and induced apoptosis in oral cancer cells.
- Simultaneous knockdown of both PLK1 and HSF1 demonstrated a synergistic decrease in cell proliferation and a significant increase in apoptotic cell death.
Conclusions:
- PLK1 and HSF1 play crucial roles in oral cancer cell proliferation and survival.
- Combined targeting of PLK1 and HSF1 presents a potent and synergistic therapeutic strategy for oral cancer treatment.
