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Experimental evidence for a unifying concept of the molecular mechanisms of the cellular aging and the cellular neoplastic transformation.

Experimental data supporting a Unifying Concept of the molecular mechanisms of cellular aging and cellular neoplastic transformation of dividing cells in mass culture and clonal culture systems will be described. The Unifying Concept combines the hitherto antithetically presented Differentiation Theory, the Mutation Theory, the Error Catastrophy Theory and the Degradation Deficiency Theory with a newly worked out Virus Theory of the cellular aging and the cellular neoplastic transformation. Quantitative in vitro studies of embryonic fibroblast cell systems of two closely related inbred rat strains L.BN and Lewis were undertaken. The data obtained from the experimental analysis of the molecular mechanisms of the cellular aging and the cellular neoplastic transformation demonstrate, that the cellular aging of dividing cells is a Three-Stage-Differentiation Sequence under the control of three different genetic programs. The genetic constitution of the senescent cell regulates the expression of virogenes and oncogenes of the endogenous RNA tumor viruses of the C-type, resulting either in the cellular degeneration of the senescent cell under the control of the virogenes or in the cellular neoplastic transformation regulated by the oncogenes.