Liao B, Xue L, He P, Zhao GQ, Che LH. Effect of oncogenes on differentiation and transformation of rat oval cells.
Shijie Huaren Xiaohua Zazhi 2004;
12:344-346. [DOI:
10.11569/wcjd.v12.i2.344]
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Abstract
AIM: To study the effects of oncogenes on differentiation and transformation of oval cells by detecting and characterizing the expression of AFP and Ha-ras, c-myc genes of rat oval cells in vitro.
METHODS: Proliferation of rat oval cells was induced by chemical carcinogen, 3'-Me-DAB. By using Percoll density gradient centrifugation method, oval cells were isolated,followed by continous cultivation in vitro. The expression of Ha-ras and c-mycgenes and AFP in the oval cells from cultures was dynamically observed by RNA-DNA slot blot hybridization and flow cytometry.
RESULTS: The expression of AFP and Ha-ras, c-myc genes in the cultured oval cells from different phases was synchronous: At the beginning of oval cell cultivation in vitro, both of AFP and oncogenes displayed a higher level expression and then declined. Up to 20th passage, the expression of AFP and oncogenes went up again and then kept a lower level. To 65th passage, the oval cells not only presented a growth rate increased, population doubling time shortened, adiploid chromosomes and growing on soft agar, but also the expression of oncogenes and AFP went up again.
CONCLUSION: Oncogenes and their products participate not only in the regulation of cellular transformation, but also in the process of cell differentiation.
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