In vitro growth suppression and morphological change in a human renal cell carcinoma cell line by the introduction of normal chromosome 3 via microcell fusion

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Abstract
Cytogenetic and molecular studies of human renal cell carcinoma (RCC) have suggested that the genetic and functional losses of one or more putative tumor suppressor genes on the short arm of chromosome 3 play a crucial role in the development of this disease. To examine whether the introduction of chromosome 3 has any effects on the biology of RCC cells, we introduced either chromosome 3, 7, or 11 from normal human fibroblasts into a newly established human RCC cell line with loss of heterozygosity for 3p, via microcell‐mediated chromosome transfer. Microcell hybrids containing an introduced, intact chromosome 3 showed a significant reduction in in vitro growth rate and saturation density together with morphological alteration; these properties were not altered in microcell hybrids containing an introduced chromosome 7 or 11. During long‐term cultivation, one of the clones that had lost the introduced chromosome 3 showed growth properties and morphology similar to those of the parental cell lines. Thus, our findings provide additional evidence for the presence of a putative tumor suppressor gene or genes on normal chromosome 3p and indicate that the gene is a dominant, negative growth regulator whose loss promotes progressive features of the neoplastic phenotype.
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