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Published on: February 9, 2024
[Effect of Ku80 expression inhibition by RNA interference on proliferation of cervical carcinoma cell line HeLa]
Liang Zhuang1, Shi-Ying Yu, Xiao-Yuan Huang
1Cancer Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China.
Background & Objective:
Ku80 is a key protein plays a role in repairing DNA double strand break (DSB) after irradiation. There are a few studies about other roles of Ku80 except DSB repair. This study was to inhibit Ku80 expression in cervical carcinoma cell line HeLa with small interfering RNA (siRNA), and explore its effect on cell proliferation.
Methods:
Plasmids pKu80-siRNA and pNeg-siRNA (negative control) were constructed and transfected into HeLa cells. The expression of Ku80 in HeLa cells was detected by Western blot. The proliferation of HeLa cells in vitro and in vivo was determined by clone formation assay, MTT assay, and subcutaneous tumor formation in nude mice.
Results:
Two cell clones were screened from pKu80-siRNA-and pNeg-siRNA-transfected HeLa cells. Ku80 expression in HeLa cells was suppressed markedly after transfection of pKu80-siRNA; this clone was named Hela/Ku80-siRNA. The clone formation efficiency was significantly lower in HeLa/Ku80-siRNA cells than in control cells (0.46+/-0.05 vs. 0.62+/-0.02, t=5.11, P<0.01). The proliferation rate was significantly lower in HeLa/Ku80-siRNA cells than in control cells at 48 h and 72 h after transfection (P<0.05). At the 25th day after subcutaneous transplantation in nude mice, the tumor volume was significantly smaller in HeLa/Ku80-siRNA group than in control group [(18.92+/-3.60) mm(3) vs. (194.88+/-30.61) mm(3), t=12.69, P<0.01].
Conclusions:
We successfully established a cell model that Ku80 expression is suppressed almost completely by siRNA. Ku80 inhibition inhibits the proliferation of HeLa cells in vivo and in vitro.
Insights
Inhibiting Ku80 expression in cervical cancer cells using small interfering RNA (siRNA) significantly suppressed cell proliferation both in vitro and in vivo. This study establishes a model for Ku80 suppression, impacting HeLa cell growth.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Ku80 is a crucial protein involved in DNA double-strand break (DSB) repair.
- While its role in DSB repair is established, other functions of Ku80 are less understood.
- Cervical carcinoma cell line HeLa is utilized to investigate Ku80's broader cellular roles.
Purpose of the Study:
- To inhibit Ku80 expression in HeLa cells using small interfering RNA (siRNA).
- To explore the effects of Ku80 inhibition on the proliferation of cervical carcinoma cells.
- To establish a cellular model for studying the non-DSB repair functions of Ku80.
Main Methods:
- Construction and transfection of pKu80-siRNA and pNeg-siRNA plasmids into HeLa cells.
- Verification of Ku80 expression suppression via Western blot analysis.
- Assessment of cell proliferation using clone formation assay, MTT assay, and in vivo subcutaneous tumor formation in nude mice.
Main Results:
- Successful establishment of a HeLa cell clone (Hela/Ku80-siRNA) with markedly suppressed Ku80 expression.
- Significantly reduced clone formation efficiency in Hela/Ku80-siRNA cells compared to controls (P<0.01).
- Demonstrated significant inhibition of HeLa cell proliferation in vitro (48h and 72h post-transfection, P<0.05) and reduced tumor volume in vivo (P<0.01).
Conclusions:
- A stable cell model with near-complete Ku80 suppression using siRNA was successfully developed.
- Ku80 inhibition effectively suppresses the proliferation of HeLa cervical carcinoma cells.
- Findings suggest Ku80 plays a significant role in regulating cancer cell proliferation beyond its known function in DNA repair.
