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Genomic fluidity is a necessary event preceding the acquisition of tumorigenicity during spontaneous neoplastic transformation of WB‐F344 rat liver epithelial cells
Author(s) -
Hooth Michelle J.,
Vincent Jack L.,
Coleman William B.,
Presnell Sharon C.,
Grisham Joe W.,
Smith Gary J.
Publication year - 1998
Publication title -
hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.488
H-Index - 361
eISSN - 1527-3350
pISSN - 0270-9139
DOI - 10.1002/hep.510280112
Subject(s) - biology , ploidy , cell cycle , flow cytometry , genome instability , dna , population , phenotype , genomic dna , cell , genetics , malignant transformation , neoplastic transformation , cell growth , microbiology and biotechnology , gene , dna damage , carcinogenesis , demography , sociology
The genomic evolution of a cohort of WB‐F344 rat liver epithelial cell lineages undergoing spontaneous neoplastic transformation was followed to define the mechanistic relationship between genomic instability and progression to the neoplastic phenotype. Eighteen independent populations of WB‐F344 cells (initiated from a single diploid‐founding population) were subjected to 12 cycles of selective growth at confluent cell density, and cellular DNA contents were measured after each selection cycle. Flow cytometry demonstrated significant gains in the amount of G 1 DNA after selection cycles 3, 6, and 7 in 44% (8 of 18), 89% (16 of 18), and 39% (7 of 18) of the cell populations, respectively. All populations subsequently lost DNA and returned to a diploid or pseudo‐diploid DNA content within 1 to 2 selection cycles after the appearance of an increased DNA content. Additionally, appearance and subsequent disappearance of aneuploid or tetraploid subpopulations was observed in 11% (2 of 18) and 83% (15 of 18) of the experimental lineages, respectively. Although perturbations of G 1 DNA content were apparent as early as selection cycle 3, at least 8 cycles of selective growth were required for the acquisition of tumorigenicity. While the independent lineages demonstrated significant fluctuations in G 1 DNA content between selection cycles 3 and 8, the majority (11 of 13) of the populations contained a diploid or pseudo‐diploid DNA content at the time tumorigenicity was expressed. Genomic instability preceded the acquisition of tumorigenic potential in rat liver epithelial cells subjected to selective growth conditions of maintenance at confluence, and may be required for its expression.