Dataset Information

Expression data from human squamous cell lung cancer line HARA and highly bone metastatic subline HARA-B4.

ABSTRACT: We investigated the molecular mechanisms for osteolytic bone metastasis by selecting human lung cancer cell line subpopulations with elevated metastatic activity and validating genes that are overexpressed in these cells. A bone-seeking squamous lung cancer cell line (HARA-B4) was established by sequentially injecting parental HARA cells into the left ventricle of male 5-week-old nude mice 4 times.

ORGANISM(S): Homo sapiens

PROVIDER: GSE29367 | GEO | 2011/05/19

SECONDARY ACCESSION(S): PRJNA140203

REPOSITORIES: GEO

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Project description:Non-small cell lung cancer (NSCLC) is a major cause of cancer-associated mortality worldwide, and bone metastasis is the most prevalent event observed in patients with advanced NSCLC. However, the pathogenesis of bone metastases has not been fully elucidated. In the present study, differentially expressed genes (DEGs) were identified by gene expression microarray analysis of NSCLC tissue samples with or without bone metastases. Subsequently, collagen family collagen 6A1 (COL6A1) was chosen as the target gene through Ingenuity Pathway Analysis and reverse transcription-quantitative (RT-q)PCR validation of the top eight DEGs. COL6A1 was overexpressed or knocked down, and the proliferation and invasion of NSCLC cells was assessed using Cell Counting Kit-8, colony formation and Transwell invasion assays. Additionally, the osteogenic capacity of HOB and hES-MP 002.5 cells was assessed using RT-qPCR, western blotting, Alizarin Red staining and alkaline phosphatase staining. A total of 364 DEGs were identified in NSCLC tissues with bone metastases compared with NSCLC tissues without bone metastases, including 140 upregulated genes and 224 downregulated genes. Gene Ontology analysis indicated that the upregulated and downregulated genes were primarily enriched in ‘cellular process’, ‘metabolic process’ and ‘biological regulation’. Kyoto Encyclopedia of Genes and Genomes pathway enrichment analysis revealed that the upregulated genes were primarily enriched in ‘cysteine and methionine metabolism’, ‘oxidative phosphorylation’ and the ‘ribosome’, while the downregulated genes were primarily enriched in ‘transcriptional mis-regulation in cancer’, ‘ribosome’ and ‘mitophagy in animals’. COL6A1 was highly expressed in NSCLC tissue samples with bone metastases. Functionally, COL6A1 overexpression induced the proliferation and invasion of HARA cells, and knockdown prevented the proliferation and invasion of HARA-B4 cells. Finally, it was demonstrated that HOB and hES-MP 002.5 cells exhibited osteogenic capacity, and overexpression of COL6A1 in HARA cells increased adhesion of these cells to the osteoblasts, whereas knockdown of COL6A1 in HARA-B4 cells reduced their adhesive ability. In conclusion, COL6A1 may serve as a potential diagnostic marker and therapeutic target for bone metastasis in NSCLC.

Dataset Information

Expression data from human squamous cell lung cancer line HARA and highly bone metastatic subline HARA-B4.

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