A correlation of APC and c-myc mRNA levels in lung cancer cell lines.
One of the functions of adenomatous polyposis coli (APC) in colorectal cancers is regulation of c-myc gene expression. However, the role of APC in lung cancers has not been elucidated. In the present study, the levels of APC and c-myc mRNA were determined in one strain of normal human bronchial epithelial (NHBE) cells, an SV-40-immortalized non-tumorigenic human bronchial epithelial cell line (BEAS-2B), 13 non-small cell lung cancer cell lines, and 4 small cell lung cancer cell lines. To establish a relationship between c-Myc and APC, we determined the ratio of c-myc and APC mRNA levels in different lung cancer cell lines. Out of 19 lung cancer cell lines, we found that 13 exhibited c-myc/APC mRNA ratio of more than two. Among the cell lines CaLu-3, NCI-H82, A427 and SW900 showed a very low level of APC mRNA and a high level of c-myc mRNA. The ratio of c-myc/APC mRNA in these cell lines was 48, 127, 325 and 708, respectively. The results of these analyses revealed an inverse relationship between APC and c-myc mRNA levels, suggesting that APC may regulate c-myc expression in lung cancer cells in a manner analogous to its role in colon cancer.
Jaiswal
A S
AS
Sealy Center for Oncology and Hematology, University of Texas Medical Branch, Galveston, TX 77555, USA.
Kennedy
C H
CH
Narayan
S
S
D025601:Adenomatous Polyposis Coli Protein; D003598:Cytoskeletal Proteins / Q000096:biosynthesis / Q000235:genetics*; D006801:Humans; D008175:Lung Neoplasms / Q000235:genetics* / Q000378:metabolism; D009363:Neoplasm Proteins / Q000096:biosynthesis / Q000235:genetics; D016271:Proto-Oncogene Proteins c-myc / Q000096:biosynthesis / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis* / Q000235:genetics; D014407:Tumor Cells, Cultured
D025601:Adenomatous Polyposis Coli Protein; D003598:Cytoskeletal Proteins; D009363:Neoplasm Proteins; D016271:Proto-Oncogene Proteins c-myc; D012333:RNA, Messenger