Abstract
Based on Akt1 and Jak1 key roles in apoptosis and proliferation of many cancers, the aim of this study was to find a new gene therapy strategy by silencing of these main anti-apoptotic genes for HNSCC treatment. Cancerous HN5 and normal HUVEC cell lines were treated with Akt1 and Jak1 siRNAs alone or with each other combined with/without cisplatin. The MTS, flow cytometry, 4′,6-diamidino-2-phenylindole staining, real-time PCR and ELISA methods were utilized in this study. The highest percentage of apoptosis was observed in the treatment of Jak1 siRNA/cisplatin group in cancerous HN5 cells (96.5%) where this treatment showed 12.84% apoptosis in normal HUVEC cell line. Cell viability reduced significantly to 64.57% after treatment with Akt1 siRNA in HN5 treated group. Knocking down Akt1 and Jak1 genes using siRNAs could increase levels of apoptosis and reduce proliferation rate in HNSCC indicating the powerful effects of these genes siRNAs with or without chemotherapeutic agents in HNSCC treatment. In conclusion, the combination of siRNA-mediated gene-silencing strategy can be considered as a valuable and safe approach for sensitizing cancer cells to chemotherapeutic agents thus proposed further studies regarding this issue to approve some siRNA based therapeutics for using in clinic.
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