Knockdown of RPL34 suppresses osteosarcoma cell proliferation likely through EIF3/FAU signaling pathway

Background: This study aims to explore the effect of knockdown of the ribosomal protein L34 (RPL34) on osteosarcoma cell proliferation through EIF3/FAU. Methods: The mRNA expression levels of RPL34, EIF3A, EIF3F, EIF3G, UBA52, UBC, and FAU were quantified using quantitative real-time PCR (qRT-PCR) in two human cell lines: the hFOB1.19 osteoblast cell line and the Saos-2 osteosarcoma cell line. The qRT-PCR analysis was performed to confirm the shRNA-mediated depletion of RPL34, and a western blot analysis was done to confirm the knockdown of protein levels. qRT-PCR was also used to examine the effects of RPL34 knockdown on the above genes. Results: The mRNA expression levels of RPL34, EIF3A, EIF3G, UBA52, UBC, and FAU were increased in the Saos-2 cells relative to the hFOB1.19 osteoblast cells. EIF3F expression was decreased in Saos-2 cells relative to hFOB1.19 cells. Knockdown of RPL34 mRNA significantly suppressed EIF3A and EIF3F expression and significantly up-regulated FAU expression in the Saos-2 cell line, but there were no remarkable differences in the relative expression in the EIF3G, UBA52, and UBC genes. Conclusions: Knockdown of RPL34 suppresses osteosarcoma cells proliferation probably through EIF3A, EIF3F, and FAU.