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. 1996 Mar 5;93(5):1825–1830. doi: 10.1073/pnas.93.5.1825

Cellular aging, destabilization, and cancer.

H Rubin 1, M Chow 1, A Yao 1
PMCID: PMC39866  PMID: 8700843

Abstract

Three major characteristics of aging in animals are a slowdown of cell proliferation, an increase in residual bodies associated with age pigments, and a marked increase in the likelihood of neoplastic transformation. The 28 L subline of the NIH 3T3 line of mouse embryo fibroblasts exhibits all these characteristics when held at confluence for extended periods. The impairment of proliferation is the first behavioral characteristic detected in low density subcultures from the confluent cultures, and it persists through many cell generations of exponential multiplication. There is an equal degree of growth impairment among replicate cultures (lineages) recovered after each of 2 successive rounds of confluence, although heterogeneity appears after the third round. The growth impairment pervades the entire cell population of each lineage. The degree and duration of impairment increase with repeated rounds of confluence. A marked increase of residual bodies characteristic of age pigments occurs in the cytoplasm of all the cells kept under prolonged confluence. Neoplastic transformation first appears as foci of multilayered cells on a monolayered background of nontransformed cells. The transformed cells arise at different times in the lineages and originate from a very small fraction of the population. The transformed cells selectively overgrow the entire population in successive rounds of confluence leading to an increase in saturation density of each lineage at different times. Under cloning conditions, isolated colonies of transformed cells develop more slowly than colonies of nontransformed cells but eventually reach a higher population density. The regularity of persistent growth impairment among the lineages and the appearance of large numbers of residual bodies in all the cells of each population are more characteristic of an epigenetic process than of specific local mutations. although random chromosomal lesions cannot be ruled out. By contrast, the low frequency and stochastic character of neoplastic transformation are consistent with a conventional genetic origin. The advent in long-term confluent NIH 3T3 cultures of three cardinal characteristics of cellular aging in vivo recommends it as a model for aging cells.

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Selected References

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