title: Implication of leucyl-tRNA synthetase 1 (LARS1) over-expression in growth and migration of lung cancer cells detected by siRNA targeted knock-down analysis.
abstract: Molecular mechanism of lung carcinogenesis and its aggressive nature is still largely elusive. To uncover the biomarkers related with tumorigenesis and behavior of lung cancer, we screened novel differentially expressed genes (DEG) in A549 lung cancer cell line by comparison with CCD-25Lu, normal pulmonary epithelial cell line, using annealing control primer(ACP)-based GeneFishing system. Of the DEGs, over-expression of leucyl-tRNA synthetase 1 (LARS1) was prominent and this up-regulation was confirmed by immunoblotting and real-time quantitative RT-PCR analysis. In addition to A549 cell line, primary lung cancer tissues also expressed higher level of LARS1 mRNA than their normal counter tissues. To explore the oncogenic potential of LARS1 over-expression in lung cancer, we knocked-down LARS1 by treating siRNA and observed the tumor behavior. LARS1 knock-down cells showed reduced ability to migrate through transwell membrane and to form colonies in both soft agar and culture plate. Taken together, these findings suggest that LARS1 may play roles in migration and growth of lung cancer cells, which suggest its potential implication in lung tumorigenesis.
authors.affiliation: Department of Microbiology, College of Medicine, The Catholic University of Korea, Seoul 137-701, Korea.
authors.forename: Seung-Hun
authors.initials: SH
authors.lastname: Shin
authors.forename: Ho-Shik
authors.initials: HS
authors.lastname: Kim
authors.forename: Seung-Hyun
authors.initials: SH
authors.lastname: Jung
authors.forename: Hai-Dong
authors.initials: HD
authors.lastname: Xu
authors.forename: Yong-Bok
authors.initials: YB
authors.lastname: Jeong
authors.forename: Yeun-Jun
authors.initials: YJ
authors.lastname: Chung
mesh_terms: D001483:Base Sequence; D015153:Blotting, Western; D045744:Cell Line, Tumor; D002465:Cell Movement; D017931:DNA Primers; D006801:Humans; D007935:Leucine-tRNA Ligase / Q000235:genetics / Q000378:metabolism*; D008175:Lung Neoplasms / Q000201:enzymology* / Q000473:pathology; D034741:RNA, Small Interfering; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D017931:DNA Primers; D034741:RNA, Small Interfering; D007935:Leucine-tRNA Ligase