Chromosomal changes in high- and low-invasive mouse lung adenocarcinoma cell strains derived from early passage mouse lung adenocarcinoma cell strains.
The incidence of adenocarcinoma of the lung is increasing in the United States, however, the difficulties in obtaining lung cancer families and representative samples of early to late stages of the disease have lead to the study of mouse models for lung cancer. We used Spectral Karyotyping (SKY), mapping with fluorescently labeled genomic clones (FISH), comparative genomic hybridization (CGH) arrays, gene expression arrays, Western immunoblot and real time polymerase chain reaction (PCR) to analyze nine pairs of high-invasive and low-invasive tumor cell strains derived from early passage mouse lung adenocarcinoma cells to detect molecular changes associated with tumor invasion. The duplication of chromosomes 1 and 15 and deletion of chromosome 8 were significantly associated with a high-invasive phenotype. The duplication of chromosome 1 at band C4 and E1/2-H1 were the most significant chromosomal changes in the high-invasive cell strains. Mapping with FISH and CGH array further narrowed the minimum region of duplication of chromosome 1 to 71-82 centimorgans (cM). Expression array analysis and confirmation by real time PCR demonstrated increased expression of COX-2, Translin (TB-RBP), DYRK3, NUCKS and Tubulin-alpha4 genes in the high-invasive cell strains. Elevated expression and copy number of these genes, which are involved in inflammation, cell movement, proliferation, inhibition of apoptosis and telomere elongation, were associated with an invasive phenotype. Similar linkage groups are altered in invasive human lung adenocarcinoma, implying that the mouse is a valid genetic model for the study of the progression of human lung adenocarcinoma.
Sargent
Linda M
LM
National Institute for Occupational Safety and Health, Morgantown, WV 26505, USA. LSargent@cdc.gov
Ensell
Mang X
MX
Ostvold
Anne-Carine
AC
Baldwin
Kimberly T
KT
Kashon
Michael L
ML
Lowry
David T
DT
Senft
Jamie R
JR
Jefferson
Amy M
AM
Johnson
Robert C
RC
Li
Zhi
Z
Tyson
Frederick L
FL
Reynolds
Steven H
SH
D000230:Adenocarcinoma / Q000235:genetics* / Q000473:pathology; D000818:Animals; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics* / Q000473:pathology; D002465:Cell Movement / Q000502:physiology; D002869:Chromosome Aberrations; D007621:Karyotyping / Q000379:methods; D008175:Lung Neoplasms / Q000235:genetics* / Q000473:pathology; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D009361:Neoplasm Invasiveness; D013045:Species Specificity; D014407:Tumor Cells, Cultured