Senescent human fibroblasts have a post-transcriptional block in the expression of the proliferating cell nuclear antigen gene

The product of the proliferating cell nuclear antigen (PCNA) gene is the co-factor of DNA polymerase delta, which is required for cellular and viral DNA replication. Its steady-state mRNA levels are growth-regulated in young human diploid fibroblasts (HDF) as well as in many other cell types. In sen...

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Bibliographic Details
Published in:The Journal of biological chemistry 1991-05, Vol.266 (14), p.8663-8666
Main Authors: CHUNG-DER CHANG, PHILLIPS, P, LIPSON, K. E, CRISTOFALO, V. J, BASERGA, R
Format: Article
Language:English
Subjects:
Ageing, cell death
Biological and medical sciences
Cell Cycle
Cell physiology
Cell Survival
Fundamental and applied biological sciences. Psychology
Gene Expression Regulation
Growth Substances - pharmacology
Humans
Molecular and cellular biology
Nuclear Proteins - genetics
Polymerase Chain Reaction
Proliferating Cell Nuclear Antigen
RNA Processing, Post-Transcriptional
RNA, Heterogeneous Nuclear - genetics
RNA, Messenger - genetics
Transcription, Genetic
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Summary:The product of the proliferating cell nuclear antigen (PCNA) gene is the co-factor of DNA polymerase delta, which is required for cellular and viral DNA replication. Its steady-state mRNA levels are growth-regulated in young human diploid fibroblasts (HDF) as well as in many other cell types. In senescent HDF, PCNA mRNA is not detectable. However, the PCNA gene is transcribed in senescent HDF as efficiently as in young cells. Furthermore, PCNA hnRNA is easily detectable by reverse transcriptase-polymerase chain reaction in both senescent and young HDF, and the levels are essentially similar. These results indicate that in senescent HDF which are incapable of synthesizing cellular DNA, one of the genes coding for a protein of the DNA-synthesizing apparatus is still transcribed, but the product fails to be processed into mature mRNA.
ISSN:0021-9258
1083-351X
DOI:10.1016/S0021-9258(18)31494-7